Note: Descriptions are shown in the official language in which they were submitted.
CA 02487193 1997-11-18
SYNCHRONIZED APPLICATTON OF ONE OR MORE MATERIALS TO A SURFACE FROM A VEHICLE
This application is a divisional of Canadian Patent Application 2,272,541
filed
November 18, 1997.
BACKGROUND OF THE INVENTION
-v.Field of the Invention:
This invention relates generally to surface conditioning vehicles such as
those carrying material spreaders and/or snow removal devices, and more
particularly relates to a new and improved apparatus for synchronized material
spreading which indexes certain characteristics of a material delivery system
such as the spread width of at least a second material in response to a change
in the width of spread of a first, or triggering, material and automated
control
of surface conditioning equipment based on actual surface conditions.
Description of the Related Art:
Surface conditioning vehicles include material spreaders that are used in
many applications. For example, they may be used to provide pesticide and
fertilizer spreaders in agricultural applications, as well as vehicles for the
control of ice and snow on roadways and may include snow plows, blowers,
and material spreaders, alone or in combination. In either of these general
applications, often it is desirable to spread more than one material
simultaneously in either a synchronous or asynchronous manner in either a
predetermined ratio or in random proportions to a surface.
CA 02487193 1997-11-18
2
The materials to be applied to a surface can be all liquids, all solids, or
combinations thereof. Generally, these materials can be referred to materials
A
& B. The widths of the plurality of materials are manually controlled
independently such that the user must decrease or increase the spread-width
for each material separately.
For example, in a pre-wetting arrangement, both liquid and granular
materials are typically dispersed by a common device such as a spinner disk.
In this example, the quantity of liquid is small compared to the amount of
granular material. Because of material characteristics, such as density,
viscosity, granularity, and flowability, and desired driveability results it
is
sometimes advantageous to have a separate delivery system for each material.
This liquid and granular combination also helps control the bounce and scatter
of the granular materials.
In spreading materials on roadways and runways for the control of ice
and snow, oftentimes both granular and liquid material are desired to be
spread
simultaneously. In many instances, each materia-1 has its own delivery system.
The operator sets the spread-width of the granular material and the spread-
width of the liquid material independently of one another. In the event the
width of the road changes, or the operator changes the width of spread for any
of a variety of reasons, such as allowing a vehicle to pass, the operator must
separately act to reduce the spread-width of the granular material and the
spread-width 'of the liquid material.
The problem with the conventional material spreading systems resides in
the difficulty in accurately adjusting the spread-width of each material, in
addition to the time and attention it takes for the operator to modify the
spread-width while driving the vehicle.
A similar problem exists for operators of surface conditioning vehicles
which include snow plows and snow blowers, especially in residential areas.
During heavy snow conditions, the conventional plows push the snow aside to
one side or the other and thus can create a substantial pile of snow in front
of
driveways. This pile is often compacted and difficult to remove. A recent
CA 02487193 1997-11-18
3
solution to this problem has been to equip the vehicle with at least one
hydraulically actuated discharge blocking plate on at least one of the ends of
the snow blade. The vehicle operator may raise and lower these plates to
close off the blade discharge path as the plow passes driveways or other
features where snow discharge is undesirable. The drawback of this
arrangement is that the system is manually controlled and thus required
constant operator vigilance and action to lower and raise the blocking plates.
It is against this background that the significant improvements and
advancement of the present invention have taken place in the field of surface
conditioning vehicles, and particularly material spreaders and snow removal
controls.
SUMMARY OF THE INVENTION
The present invention comprises an apparatus mounted on a service
vehicle for synchronized application of fluid materials, either solid or
liquid, to
a surface such as a runway or roadway in proportional amounts or spatially
distributed proportions in response to user defined requirements and/or
operation of a vehicle mounted component in response to conditions
encountered in real time.
A first embodiment of the present invention is a vehicle mounted
apparatus and system far coordinated application of a plurality of materials
to
a surface simultaneously and in desired proportions and/or widths
automatically and/or selectively.
A second embodiment of the present invention is a vehicle mounted
apparatus and system for coordinated application of a plurality of materials
to
a surface simultaneously and in desired proportions andlor widths
automatically andlor selectively. The apparatus includes a granular material
distribution device and includes a plurality of liquid spray headers and
pumpinD
means.
A third embodiment of the present invention is a vehicle mounted
apparatus and system for automated coordinated application of a plurality of
CA 02487193 1997-11-18
4
materials to a surface as well as automated component control such as blade
blocking plate control based on sensed current surface condition information
and current accurate location information, preferably in conjunction with
learned weather and surface conditions.
The first embodiment of the present invention comprises a vehicle
mounted apparatus for dispensing one or more materials to a surface such as a
roadway. The apparatus includes a control box and distribution means for
coordinated dispensing one or more fluid materials (the slave material) in
response to the dispensing rate or pattern of another fluid material (the
triggering material). The fluid materials may be solids such as sand or salt
granules or liquids of various types. The apparatus preferably includes a
liquid
supply tank, pump, and application spray header and a solid fluid material
storage container or hopper, auger, and distribution means such as a spinner
disk, and a control box operabIy connected to the pump and spray header, the
wspinner disk, and the auger motor. '
The second embodiment of the present invention is similar to the first
except that the system further includes a second spray bar for pre-wetting the
granular material prior to the granular material being dispensed.
The third embodiment of the present invention incorporates an on board
system for sensing and analyzing actual road surface conditions at the vehicle
location and utilizes an on board computer and database to selectively
manually or automatically control the application of spreader materials and/or
certain operations of a vehicle preferably equipped with a snow plow or
blower. The third embodiment includes Global Positioning System receivers
and computer controlled reporting capabilities to update other mobile or
stationary stations as well as permit the on board computer to receive current
and store historical environmental condition data in a Geographical
Information System format in order to automatically adjust material
application
compositions and rates to optimally condition the road surface and control
snow plow or blower configurations.
CA 02487193 1997-11-18
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a side view of a spreader vehicle incorporating the
synchronized-width material spreader in accordance with a first embodiment of
5 the present invention.
Fig. 2 is a rear-end view of a second embodiment of a vehicle including
the synchronized-width material spreader of the present invention,
illustrating a
granular hopper, liquid storage tanks, spreader disk, and two liquid spray
bars,
one for pre-wetting and one for direct application.
Fig. 3 is a first embodiment of a control box for use in controlling the
synchronized-width material spreader in accordance with the invention.
Fig. 4 is a second embodiment of a control box for controlling the
operation of the synchronized-width material spreader in accordance with the
invention.
Fig.S is a third embodiment of a control box for use in operating the
synchronized-width material spreader.
Fig. 6 is a schematic representing the operation of the synchronized-
width material spreader, and illustrates an increase in the width of material
spread using the synchronized-width material spreader of the present
invention.
Fig. 7 is a schematic of the operation of the synchronized-width material
spreader illustrating a decrease in the width of material spread.
Fig. 8 is a schematic of the hydraulic, electrical and material flow
system utilized in operation of the synchronized-width material spreader.
Fig. 9 is a block diagram of a remote sensing system incorporated into
an automatic control system in a third embodiment of the invention.
Fig. 10 is a block diagram of the automatic control system for the
material spreader in accordance with the invention.
Fig. 1 I is a schematic plan view of an adjustable snowplow assembly on
a road service vehicle in accordance with the invention.
Fig. 12 is a schematic side view of the snowplow assembly shown in
Fig. 11.
CA 02487193 1997-11-18
6
DETAILED DESCRIPTION OF THE INVENTION
Referring to Fig. I, a snow plow vehicle 40 incorporating the
synchronized-width material spreader system 42 in accordance with a first
" 5 embodiment of the present invention is shown. The snow plow vehicle 40
includes a system for storing and spreading granular material, as well as a
system for storing and spreading liquid material. While the vehicle could
include multiple systems for storing and dispensing several individual types
of
fluid materials, for the purposes of clarity; the description herein is based
on a
vehicle having the capability of storing and dispensing only two different
materials. In this particular example, there is one granular fluid material
and
one liquid fluid material. It is to be understood that there may be more than
two materials as well as any combination of granular and/ or liquid materials.
Further, the synchronized-width material spreader of the present
invention as described in this specification is used in the environment of
controlling snow and ice on roadways for descriptive purposes only. The
invention is applicable to many different uses, such as for crop fertilizing,
ground conditioning during road construction, etc. It is to be understood that
the synchronized spreader may equally well be utilized for these and other
purposes where the distribution of two or more similar or dissimilar materials
is desired.
The granular material 44 is typically dispensed from the truck 40 by use
of a spinning disk 46, but may also be dispensed by other means such as
gravity or air pressure. The granular material 44 FS typically a granular
chemical or abrasive material. The granular material 44 stored in the hopper
48 is conveyed, such as by an auger 50 to a chute 52 at the rear of the truck
through which it fails into contact with the spinning spreader disk 46. In
this
example, the spreader disk 46 spins about its center generally vertical axis
and
imparts a tangential force to the granular material as it falls onto the disk.
The
granular material is spread or spewn over a path width, which is determined in
CA 02487193 1997-11-18
7
part by the speed of rotation of the spreader disk 46, and many other
parameters, such as density of the material.
Rotation of the spreader disk 46 may be caused by any of a variety of
means, including an electric motor, air pressure, or hydraulic pressure. Other
dispensing mechanisms may also be used in place of the spreader disk 46. For
example, two rotating belts that ,rap the material and sling it out behind the
truck could also be used. Alternatively, the material could be propelled from
the storage hopper or container out through an orifice via air pressure or
through venturi action, for example. Any of such dispensing mechanisms may
be used in the present invention.
The width of spread of the granular material 44, or liquid material 57, is
measured in a direction transverse to the length of the vehicle 40, and is
typically analogous to the width dimension of a road, upon which the vehicle
40 travels. For instance, in Fig. 2, the spreader disk 46 may deliver granular
material in a path having an arc width equal to the width of the vehicle 40.
The material can also be projected rearwardly {to facilitate a lower or zero-
velocity impact with the ground), forwardly, or at any angle from the truck.
The liquid dispensing system utilized in the present invention may
comprise a liquid storage vessel 54 positioned on the vehicle 40 behind the
cab
of the vehicle, in front of the hopper 48, as shown in Fig. I . Alternatively,
the
liquid storage vessel 54 may essentially be bifurcated and positioned along
the
length of the vehicle on the outer sides of the granular hopper, as is shown
in
Fig. 2. Many other liquid tank positions could be utilized or the tanks could
form part of the structural portion of the granular hopper 48 or a structural
portion of the vehicle 40.
A spray bar 56 preferably extends laterally at the rear end of the vehicle
40 and is generally adjacent to the spreader disk 46, as is chown in Fig. 1.
The
spray bar 56 may also be farmed by a vertical stack of smaller spray bars and
nozzles. The spray bar 56 preferably may have side shooting extensions 60 and
62 attached at its opposite ends to allow liquid 57 to be sprayed at a greater
width through the spray bar. The liquid spray 56 bar position may also be
CA 02487193 1997-11-18
8
locally or remotely variable so that-it may extend at any angle from the
truck,
to create any number of orientations. For example, the spray bar may be
vertically oriented for spraying roadside vegetation ar shoulder areas. Figs.
1
and 2 illustrate a typical preferred transverse spray bar position for a flat
road
surface.
Liquid is preferably conveyed from the liquid storage vessel 54 to the
spray bar 56 through conventional piping by means such as a positive
displacement ar centrifugal liquid pump which pumps tire liquid material from
the storage vessel to the spray bar, or by pressure means such as selectively
pressurizing the liquid storage vessel itself, or by gravity feed, which would
force the liquid through the piping to the spray bar 56.
In the preferred example illustrated in Fig. 2, the spray bar has a center
portion S8 and two preferably remotely movable side spraying portions 60, 62.
The spray bar 56 is essentially a tube which has nozzles or apertures 64
formed
therein to allow the liquid flowing through the spray bar 56 to spray onto the
road surface. The side spraying extensions 60, 62 are preferably rotatably
attached at either end of the spray bar central portion 58 and are in fluid
communication with the center portion 58 of the spray bar 56 in all positions
when a single central pump is utilized. When separate pumps are utilized, the
central portion 58 need not be in fluid communication with the end portions 60
and 62.
A series of remotely operable baffles or valves such as solenoid valves
are positioned within the spray bar 56 adjacent to or as Bart of each nozzle
64
to facilitate changing the width of spray emanating from the spray bar 56. The
width of spray can be controlled by either the ~operator~ or by automated
control. The valves or flow restrictors such as baffles can optionally be
placed at discreet positions along the length of the spray bar 56, and include
positions in the left or right end portions 60, 62 of the spray bar 56. The
valves, flow restrictors or baffles or other flow control devices could also
be
. made to operably move along the length of the liquid spray bar 56 to provide
virtually infinite width control.
CA 02487193 1997-11-18
9
The spread distance or spray path width of the liquid dispensing system
for a given type of material depends upon the orientation of spray bar and /or
nozzles, and both the pressure at which the liquid is forced through the pipe
system and into the spray bar 56, and the selective activation of the valves
or
baffles found on or inside the spray bar 56._ Typically the spray bar 56
receives
fluid from the center piping connection such that any width control mechanism
is necessarily positioned along the length of the spray bar relative to the
location of the connection between the piping system and the spray bar.
The liquid can alternatively also be spread by means of a rotating disk
(not shown), in which case the spray bar or set of spray bars are replaced
with
at least one rotating nozzle disk or set of disks, and the spread width of the
liquid thus depends on the disk orientation and placement and speed of the
rotating disk in an analogous fashion to the rotating disk 46 used with the
granular material as well as the discharge pressure and orifzce size. Other
means of spreading the liquid material may also be utilized such as through a
selectable set of variable orifice discharge nozzles and/or flow control
valves
mounted on the truck.
For ease of description in this specification, the center of the spread-
width for the granular material 44 and the center of the spread-width for the
liquid material 57 are positioned co-extensively with one another at the rear
of
the vehicle 40.
In general, the synchronized-width material spreader works, either
manually or optionally automatically, to control the spread-width and
direction
of the second or nth material based on the change of spread-width of the
- trigger or first material. For instance, if the trigger or first material is
the
granular material 44 being spread at a predetermined rate, when the spread-
width of the granular material increases by 50%, the synchronized-width
material spreader sysiem automatically increases the spread-width of the
liquid
material 57 by a predetermined percentage, in this example, 50%, to match the
increased spread-width of the granular material 44. Likewise, if the granular
material 44 decreases in spread-width by 50%, the synchronized-width material
CA 02487193 1997-11-18
spreader system automatically decreases the spread-width of the liquid
material
57 by 50%.
A user selectable pre-set ratio selected from a range of ratios can also
be maintained. For instance, if the liquid material spread width is selected
to
5 be two-thirds (66%) of the granular material spread width, then when the
trigger material spread width is changed, either increased or decreased; the
spread width of the other, or "slave" material is also changed to maintain the
pre-selected ratio.
Also, a sliding scale or trigger/slave distribution arrangement based on a
10 mathematical relationship may be used, e.g. based on certain
characteristics of
the multiple materials may be deployed-such as, if trigger material spread
width
is "x" feet, then slave material would be "y" - for example 50% of x feet.
This
configuration may be desirable to compensate for differences in particle
sizes,
density, liquid viscosity, atomization particle sizes, bounce, etc. Therefore,
as
the trigger width changes from minimum to maximum, the slave material width,
due to above mentioned characteristics could be varied, say, from 40% to
70°!°
of trigger material spread-width. As another example, if the sliding scale
ratio
is 0.33, and the granular material spread width is increased by 6 feet, the
liquid
material is increased by only 2 feet (33%). Likewise, if the granular material
spread width is decreased by 3 feet, the liquid material spread width is
likewise
decreased by 1 foot (33%). This capability is particularly useful where the
trigger material may have one particle size and the slave may have a different
particle size or mass, resulting in different roadway bouncing characteristics
between the two materials, in order to have a desired uniform or non-uniform
pattern of deposition on the roadway surface. ~ This capability may also be
advantageously employed when particle weight, particle size, density, liquid
viscosity, atomization sizing, etc. behave differently, yielding other than
uniform distributions when-direct proportioning is utilized.
Such a sliding scale can also be implemented, whereby the change of the
slave or following material (liquid in example above) is only increased or
decreased a set percentage or fraction of the change in the trigger or primary
CA 02487193 1997-11-18
11
material (granular material in example above). Again, the ratio of slinging,
propelling force could also change if the trigger was being sent, for example,
ft verses 50 ft. to achieve the same result. The change in material
distribution may also be based on vehicle location, etc. For instance, the
5 material distribution may be different for steep hills than on flat level
roadway
surfaces.
Using this inventive proportioning system of the invention, the operator
can simply control, for example, the spread-width of each of the different
materials being dispensed onto the road surface by controlling one trigger
10 material or by having the width of the first material automatically changed
based on vehicle location. Consequently, the operator need only actuate the
width control system for the trigger material, and the operator does not have
to separately and independently control the spread-width of the second or
additional or nth material unless special circumstances warrant such control
as
it will automatically follow the trigger in accordance with the preset or
preprogrammed proportions.
The synchronized-width material spreader apparatus is beneficial in
many circumstances, such as where the roadway narrows, and the width of
spread of the various materials must be adjusted to a chosen value for an
extended period of time, and also where the width of spread need only be
temporarily adjusted, such as where at least a second vehicle or obstacle
passes
relatively alongside the spreader vehicle 40.
For instance, automated control could be triggered by a stationary
signal device adjacent to, in or on the roadway as part of an Intelligent
Transportation System (ITS). Additionally, ~by use of Geographic Information
System (GIS) data in conjunction with Global Positioning System (GPS) data,
the precise vehicle location may be automatically determined and automated
control initiated. The particular ratio, or scaling, between the spread widths
can also be maintained, as described below.
A preferred methodology involves a control system having a
microprocessor and associated software that can control the material spreader
CA 02487193 1997-11-18
12
to distribute both materials in such a fashion that a width-change in one
material is, driven by and/or sensed by the microprocessor, which then
initiates
a change in the drive mechanism for the width of the other, or second material
(more than two materials could be controlled) so that the proportioning or
width of bath materials is synchronized and/or adjusted even though the
materials leave their separate and distinct launching and/or propelling
devices
and travel through the air before landing on the road surface.
Other methods for coordinating a change in the width of one material
with a like or predetermined (such as for scaling or ratios) change in the
width
of a second or nth material might include, singularly or in any combination,
the
following:
1. The synchronization/coordination in width of spread could be
accomplished with electrical control devices such as relays or solid state
switches in such a fashion that a change in one relay conditioned with
the triggering material would initiate a change in a different relay
coordinated with the second, or nth material that would increase or
decrease the width of spread of the second or nth material by affecting
the propelling means of the other second material or materials.
2. The change in the width of the second material could be
implemented through the use of hydraulically actuated devices since the
spreader disk, for example is typically operated by a hydraulic motor.
The control hydraulic pressure in the trigger material delivery system
could be sensed or utilized by the control system to thereby control,
i.e. effect a change in the width of spread of the other material.
3. Optionally, the change of width could be accomplished with
pneumatic air power in a manner similar to 2 above.
If only one material is being dispensed from the vehicle 40, obviously
there would be no need for width.coordination for the other materials.
However, control of the application width is still very desirable in many
circumstances. The application width of the one material may be controlled
manually via the control box 70 or automatically in response to ITS sensor or
CA 02487193 1997-11-18
13
GPS signals or other sensory devices placed in, ,on, or near the roadway in
order to optimally distribute the material to the roadway surface without over-
dispensing or under-dispensing the material being deposited.
A proximity sensor can be utilized to control the synchronized-width
material spreader system on the vehicle 40. The proximity sensor, of any
known type, such as radar or optical, may be ground based, sub-surface based,
aerial based, or vehicle mounted, and can be used from any location, either
stationary or truck mounted, to detect the presence of the subject vehicle, or
of an oncoming, approaching, or passing vehicle or stationary obstacle, and
act
through operable connection to the control system to modify the spread width
and/or proportionality of the various materials. GPS signals may also be used
in order to precisely fix the location of the vehicle 40 and compare
previously
stored environmental condition data at the vehicle's location with current
conditions as is described more fully below.
The proximity sensor, if mounted on the truck, can be positioned at a
variety of locations, most notably the front and rear of the vehicle, to sense
the
presence of oncoming and passing vehicles. As noted above, the proximity
sensor or signal receiver can also be positioned in or on the ground, in the
air
or other location remote from the truck to send signals to the truck with the
same result.
In addition, the global positioning system (GPS) receiver signal can be
used as an input to the automatic control of the material spread width as well
as for adjusting various material types and amounts, etc. being applied
through
the use of the control system. For instance, if the course on which the truck
40 is traveling has been determined and mapped in GIS format and stored in a
computer database, for the optimal spread widths and material proportionality
at different geographical features or locations, such as, without limitation,
bridges and locations of differing road widths, then the control system can be
triggered by the real-time GPS readings to adjust the spread width to the
known optimal dimensions, deposit desired material types and amounts, etc at
the appropriate locations.
CA 02487193 1997-11-18
14
While the synchronized-width material spreader 42 is described herein in
use on a spreader system having a different dispensing system for each of the
two- different materials, the synchronized-width material spreader system can
also be used and implemented with a spreader having a common launching
mechanism, which is capable of differential launching speeds based on
differing
characteristics of the multiple materials so that both or all materials travel
the
desired distance. In this case, differential distances (absolute or
percentages)
would be selected according to the characteristics of the materials and the
optimal dispensed mixture rates. Spreader system 42 can also be used in
spreaders dispensing several different materials. Different materials will
travel
different distances with the same throwing power. Therefore, a calibration of
the launching mechanism coupled with the various materials to be utilized will
help increase the accuracy of the spread width.
As another example, where the ratio of spread widths is 1.5:1 between,
for instance, but not limited to, granular and liquid materials, the granular
(trigger) material would be spread at a distance of 9 feet, and the liquid
would
be spread at a distance of 6 feet. If the control system is actuated to reduce
the spread width of the granular material to 6 feet, the liquid spread width
would automatically be reduced to 4 feet to maintain the ratio to 1.5:1
between
the granular and liquid spread widths. Alternatively, the spreader control
system could allow the ratios to be reversed or adjusted as desired by the
operator, other person, or automatically.
Referring to Fig. 3, a first embodiment of a control box 70 for use with
the synchronized-width material spreader system 42 shown in Figs. 1 and 2 is
shown. The control box 70 can be positioned adjacent the operator in the
truck or integrated into the dashboard of the vehicle, and can be used by the
operator to simply control the material or materials being dispensed from the
vehicle, either manually or automatically. Alternatively, the control box
could
be at a position remote from the driver, or even the truck, to operate a slave
unit and could be controlled by a third party or controller device, thus
requiring the driver to simply drive, while the material dispensing system 42
is
CA 02487193 1997-11-18
IS
controlled by a third party or remote computer via the slave unit mounted in
the vehicle.
The first and second embodiments of the invention, shown in Figs. l and -
2, contemplate controlling two materials, a granular material 44 and a liquid
S material 57, with the granular and liquid systems being analogous to those
previously explained and described above. The same or a similar system, as~
described herein, could also be used to control more than two materials,
whether they be liquids or granular materials and in any combination. The
control box 70 in the embodiment shown in Fig: 3 contains a plurality of
toggle
switches 72, 74, 76, 78, and 92 as well as a plurality of fine-adjustment
knobs
86, 88, and 90, each having a specific.use. Master switch 72 is the master
switch for the liquid spreading system. When the master switch 72 for the
liquid spreading system is turned on, the liquid material control switches 74,
76 and 78 are enabled and can be operated. The toggle switch 74 is an on/off
I S actuation switch device for controlling the liquid flowing through the
left end
60 of the liquid spray bar 56, which is controlled by an associated left
liquid
valve 80 (shown schematically in Fig. 8). Once activated, the valve 80 could
be proportionately controlled by the control box 70, as described further
below. Switch 76 is an on/off toggle switch similar to switch 74, but instead
is
used to actuate the flow of liquid material through the center portion 58 of
the
liquid spray bar 56, and controls the center liquid valve 82 in the liquid
dispensation system (see Fig. 8). Once activated, the valve 82 can be
proportionately controlled by the control box ?0. The switch 76 is an on/off
toggle switch for actuating the flow of liquid through the right portion 62 of
2S the liquid spray bar 56, and controls the right liquid valve 84 (see Fig.
8).
Once activated, the valve 84 could be proportionately controlled by the
control
box 70. The position of the knob 86 controls the speed of rotation of the disk
46 which spreads the granular material 44 and is graduated between zero and
100% dry material spread-width. The control knob 88 controls the rate of
flow of liquid through the liquid dispensing system (for instance, in gallons
per
lane mile). The control knob 90 controls the rate of granular material being
CA 02487193 1997-11-18
16
dispensed through the granular dispensing system (for instance pounds of
material per lane mile). The ON/OFF master switch 92 controls the on/off
status of the entire spreader system. The visual display screen 94 is used to
indicate to the operator what the settings are.
In using the first embodiment of the control box as disclosed in Fig. 3,
the granular material 44 is the trigger material from which the system
triggers
the liquid.spread-width. The operator first turns on the spreader system by
toggling the ON/OFF master switch 92 to ON. The operator then sets the rate
of granular disbursement and the rate of liquid disbursement using the
appropriate control knobs 88, 90, respectively. At this point, the operator is
only engaging the dispensing system for dispensation of liquid material to the
road surface. The switches 74, 76 and 78 are appropriately activated by the
operator as desired. As shown in Fig. 3, all three switches are in the ON
position. This results in liquid S7 being dispensed from the entire spray bar
S6
through the left, center and right portions.
In operation, where the first embodiment of the control box shown in
Fig. 3 is used, and the granular material 44 is considered as the trigger
material
off of which the spread width of the slave liquid material S7 is controlled,
the
operator modifies the -width of the granular spread by adjusting the control
knob K. Adjusting the K control knob causes a signal to be sent through the
electrical lines to the disk valve 1 SO to allow more hydraulic fluid to flow
through the motor 144 for the disk 46. Adjusting the granular knob 90 in turn
causes a signal to be sent through the electrical lines to the auger valve 148
and allows more or less hydraulic fluid to flow through the motor 142 for the
auger thus changing the rate at which the granular material is fed to the disk
46. This in turn changes the speed at which a disk spins, thus changing the
granular spread width. As discussed, the change in granular width using the K
control knob will be sensed and cause a change in liquid spray width.
Control knob 86 is shown positioned at approximately 30% of the
maximum disk speed, to control the granular material spread-width. In this
situation, both granular 44 and pre-wetting liquid 57 materials are being
spread
CA 02487193 1997-11-18
17
by the disk 46, and the liquid material being spread by the spray bar. In the
event that control knob 86 is rotated to 75% of maximum granular spread-
width, software internal to the control box 70 controls the increase in disk
46
spinning speed, causing the granular material 44 to be spread to a greater
width. Software internal to Box 70 simultaneously senses the selected increase
in the granular spread-width and accordingly sends sufficient liquid material
to
the center, left and right spray bar portions 58, 60 and 62 to match the new
width of the granular material being disbursed by the disk 46.
The nozzles 64 in the spray bar 56 can also be adjusted accordingly by
the software controller to adjust their spread-widths appropriately. The
operator can also shut down the left, right or center portions of the spray
bar
56 and keep them from dispensing liquid ~7 there through by operating the
toggle switches 74, 76 or 78, respectively, manually. This would be effective
for temporarily turning off, for instance, the liquid disbursement from the
left
spray bar portion 60 to allow an oncoming vehicle to pass the vehicle 40. In
this example, if the liquid was the trigger material, this action would also
typically automatically adjust the width of the nth material.
Turning now to Fig. 4, with the granular material 44 as the trigger
material, a second embodiment of the control box 91 is disclosed. The control
knob 93 controls the width of spread of any and all materials which are
enabled. The Inhibit right control knob 95 will inhibit any enabled material
from being spread to the right side of the carrier regardless of the spread-
width
selected on control knob 93. The control knob 98 controls the rate of liquid
disbursement through the spray bar 56 to the road surface (for instance
gallons
per lane mile). The control knob 100 controls~the rate of granular material 44
disbursement to the road surface (for instance pounds per lane mile). The
granular material dispensing means and the liquid material dispensing means
are controlled by each appropriate switch: center 102, 104; left 106, 108; and
right 110, 112 on the control box 91. These switches allow the operator to
selectively turn on and off as desired the spread of material in any of these
regions.
CA 02487193 1997-11-18
18
Turning now to Fig. 5, a third embodiment of control box 1 I4 is
disclosed. The third embodiment of the control box includes a control knob
116 which controls the width of spread of any enabled materials; and an
Inhibit
Left control knob 118 and Inhibit Right control 'knob 120, a left 122, center
S 124 and right 126 liquid on/off toggle switch, and a single granular on/off
toggle switch 128. A master control switch 130 allows the operator to turn
the dispensing system on for granular material spreading only, liquid material
spreading only, or a combination of granular and liquid material spreading.
As an example of the general operation of the synchronized-width
material spreader, Fig. 6 discloses an increase in the spread-width of the
liquid
disbursement triggered by the increase of the granular spread-width. The
synchronized-width material spreader system thus causes the liquid spread-
width to automatically control the width of the granular spread-width. In
Fig. 6A, the granular material is shown as being spread to a width of
approximately eight feet by the spread disk, and the liquid is being spread to
a
width of approximately eight feet by the center portion of the liquid spray
bar.
In Fig. 6B the operator increases the granular material spread-width to 16
feet
by appropriately modifying the K control knob setting, for instance in the
first
embodiment of the control box 70. The synchronized-width material spreader
system 42, through the various sensing means employed therein, senses the
increase in the spread-width of the granular material, and automatically
increases the spread-width of the liquid material through the spray bar
portions, in this instance by actuating the left and right portions of the
liquid
spray bar, which causes the liquid spread-width to match the granular spread
width (Fig. 6C).
In Fig. 7, a decrease in the spread-width of the granular material, as
triggered by the decrease in spread-width of the liquid material is shown. In
Fig. 7A the spread-width of both the granular and liquid material is set at
approximately 20 feet. The operator then actuates the control of the liquid
disbursement to reduce the liquid spread-width to approximately eight feet
without use of the side extension nozzles. as shown in Fig. 7b. (Fig. 7b is
CA 02487193 1997-11-18
19
shown without the granular material distribution illustrated for clarity). The
synchronized-width material spreader system, through the various sensor 1
means employed therein accordingly reduces the spread-width of the granular
material by, for instance, reducing the spin speed of the disk (Fig. 7c).
The width and direction of material spread off of a spinning disk 46 can
be controlled by the point of impact of the granular material 44 as it strikes
the
disk 46_ As is well known, if the disk 46 is moved with respect to the
dispensing chute, or the chute is moved with respect to the spinning disk 46
so
that the impact point is changed radialty and/or circumferentially around the
IO disk, the desired flow width and direction can be controlled.
Referring now to Fig. 8, a schematic diagram of the hydraulic fluid,
liquid material and electrical control system is disclosed. The hydraulic
system
is a closed-loop system and comprises a hydraulic fluid reservoir 132 which
provides a source for the hydraulic fluid I34 in the system and a repository
for
the return hydraulic fluid. The hydraulic fluid system controls the power
setting on the various hydraulically driven liquid pumps, 136, 138 and 140,
which control the amount of fluid flow through the nozzles as ultimately
controlled by the operator through the control box. The hydraulic system also
controls the power setting of the motor for the auger 142 which drives the
auger 50 to move the granular material 44 to the disk 46, as well as the motor
144 driving the disk, which controls the spin speed of the disk, which
ultimately controls the spread-width of the granular material 44. The
hydraulic
fluid flows through the various lines under pressure generated by the pump 146
and flows through the various liquid pumps as necessary, and recirculates to
the hydraulic tank reservoir 132. The hydraulic fluid flows through the
various
lines under the pressure of the pump 146 to the motor for the auger 142 and
the motor 144 for the disk, as determined by the settings on the control box
70. The hydraulic fluid also flows through the valves 148, 1 SO for the auger
motor and the disk motor, respectively, the values being controlled by the
control box 70 settings, and recirculates through a return line to the
hydraulic
reservoir 132.
CA 02487193 1997-11-18
The liquid material system includes a liquid storage reservoir 152, which
stores the liquid for dispensing through the spray bar, a plurarity of liquid
lines
connected from the storage reservoir 152 to communicate and be acted upon
by the appropriate pump, such as LP~, through a dedicated liquid valve 84 in
5 line with the liquid material 57, at which point the liquid is diverted
either back
to the liquid storage reservoir, or to the liquid nozzle i58. Bach of the
left,
center and right portions of the liquid spray bar have an associated pump,
valve, and nozzle arranged as previously described. Alternatively, there could
just be one liquid pump in the system. With only one pump in the system,
10 appropriately controlled valves and sensors would provide feedback to
control
the liquid pump output volume to compensate for changes in demand based on
user controlled valve operations and corresponding width of spread.
The electrical system is controlled by the control box (for instance, box
70) and communicates to the liquid valves for the left, center and right
15 portions of the liquid spray bar, the liquid pumps 140, 138, and 136
associated
with the left, center and right liquid spray bar portions (if separate pumps
are
provided), the valve I48 for the auger and the valve I50 for the disk, which
control the hydraulic fluid flow to the motor auger 142 and the motor disk
I44, respectively. The motor auger MA drives the auger to move the granular
20 material to the spinning disk, the motor MF3 drives the spinning disk 46.
The optional flow meter 162 is designed to feed information regarding
disk speed to a controller 160 which controls the liquid spray width. The
liquid spray width is preferably varied by controller 160 as a result of
sensing
more or less hydraulic fluid flow from the pump 146 to the granular launching
device for the trigger material, such as the spinner disk 46.
The software of the synchronized width material spreader system 42
senses the increase in spread width of the granular material 44 and sends the
appropriate signal to the liquid valves and liquid pumps for each of the right
center and left portions of the liquid boom 56 and allows more hydraulic fluid
to drive the liquid pumps to pump the fluid through the boom at a higher
pressure. The liquid valves, such as LV-R, also are opened or adjusted
CA 02487193 1997-11-18
21
accordingly to allow the liquid to flow at the appropriate rate and proportion
through the valve and to the nozzle to accordingly increase the width of
spread
of the liquid dispensing. The liquid valves control the amount of liquid
material 57 that flows back to the liquid storage reservoir 132 or to the
nozzles on the spray bar 56, and when in combination with the increased
pressure generated by the liquid pump can cause the liquid material to 6e
sprayed over a greater width. The nozzles could also be adjustable to provide
even a finer control of the Iiquid material spread-width. Reducing the spread-
width of the liquid material as triggered by the granular material spread-
width
l0 operates analogously. Of course, the spread-width of the granular material
can
be controlled as a slave with a trigger being the spread-width of the liquid
material.
Referring now to Figs. 9 and 10, a block diagram of a remote surface
condition sensing and control apparatus in a third embodiment of the invention
is shown for providing real time surface condition information to the vehicle
operator and to the on board computer 216 utilized to automatically control
the material spread on the vehicle roadway surface. This third embodiment is a
completely automatic sensing and material agplication apparatus 200 which is
mounted on the vehicle 40. The local sensing portion is shown in Fig. 9. The
control and remote component connections are shown in Fig. 10..The sensing
portion of the system 200 includes at least one electromagnetic radiation
transceiver 202 which emits a ultra-wide band (UWB) impulse radar. A very
short electromagnetic (EMR) impulse is propagated from transceiver 202 and
echoes that reflect from the road surface 204 and from material on the road
surface are evaluated. These reflected signals are set to a depth processor
206,
a density processor 208, and at least a chemical composition processor 210.
The EMR reflected pulse may be utilized directly by the depth processor 206
to determine the depth of any surface layer of material on the roadway.
However, the density processor, and composition processors 208 and 210 rely
also on input from a database 212 to determine, by comparison to peak height
or phase shift of the reflected signal versus the incident signal, an output
which
CA 02487193 1997-11-18
22
is unique to a particular chemical composition and density. Comparing these
outputs to the database content produces or can result in quantitative density
and composition information 214 which is, in turn, fed to computer 216 along
with depth information 218.
The depth 218 is processed in the computer 216 to provide a display
220 with information necessary to determine what additional chemicals need to
be deposited on the road surface in order to minimize the hazardous
conditions. In addition, the computer 216 may provide a direct output to a
control device for automatically dispensing the appropriate amounts of
chemicals to the road surface as the vehicle drives over the road surface.
An infrared transceiver 222 is also mounted on the vehicle and is
directed toward the road surface. The transceiver 222 provides an output to a
road temperature processor 224 which in turn also feeds an output to the
computer 216 indicative of the actual road surface temperature.
The apparatus 200, in accordance with the third embodiment of the
present invention, may be compactly designed for unitary installation in the
cab
of a road maintenance vehicle, such as a salt truck, with the display 220 and
an
input device 226 such as a keyboard integrated into the dashboard of the
vehicle. The driver can then input to the computer 216 desired deicing
concentrations or other desired input information. The computer 216 then can
compare the actual composition and status of the material already on the road
and preferably display this information for the operator to use in manually
controlling application of chemicals and/or automatically control the
dispensation of additional chemicals to the road surface. The automatic
dispensing of chemicals may be automaticallydetermined by the computer from
a database of predetermined criteria for that location or calculated based on
weather conditions, sensed road surface conditions and the desired road
surface conditions. The computer 216 also provides a running historical data
input to the database 212 to track chemical application data at the particular
location, whether the application be manual or automatically accomplished.
CA 02487193 1997-11-18
23
As is shown in Fig. 10, the computer 216 of the apparatus 200 also may
be connected through a communication interface device such as a radio modem
230 to a remote computer/processor station 232. The apparatus preferably
includes an on board Global Positioning System ~(GPS) receiver or a
Differential Global Positioning System (DGPS) receiver 234 which provides
accurate spacial position information for the vehicle 40 to the computer 216.
The database 212 preferably includes a Geographical Information System
(GIS) format database for the region in which the vehicle 40 is being
operated.
Together with the GPS coordinate information from the receiver 234 and the
GIS database information in the database 212, the computer 216 constantly
tracks the vehicle's position and stores sensed current road conditions, as
above described, in the database 212. The computer 216 then compares the
position with historical weather conditions and road surface conditions that
have occurred at the vehicle's location which are stored in GIS format in the
database 212. This position, past and current road condition information are
then preferably compared with near term weather information relayed by the
remote station 232, or provided directly by an on board weather data receiver,
and balanced against the preprogrammed or predetermined desired
requirements for the vehicle's location. The resulting difference information
is then translated to compensatory surface application composition and
distribution commands fed to the spreader system 42. The information is .
continually updated based on the most recent data as the vehicle 40 travels
along its route.
The remote station 232 may be a stationary commandlcontrol station or
may actually be one or more mobile stations connected via communication
links in a network of other similar computers mounted in other service
vehicles. The remote station 232, if stationary, may include a DGPS receiver
236 to provide reference GPS data signals to the computer 216 for very
accurate DGPS position determinations. In addition, the remote station. 232
and/or computer 216 may receive weather forecast data received from other
sources such as the National Weather Service or private forecasting service
via
CA 02487193 1997-11-18
24
receiver 238. This forecast information may be correlated and translated to
the particular positional coordinates of the vehicle 40 in order to predict
near
term weather conditions and transmit this information to the computer 2I6 and
also predict near term trouble spots in other locations. The eoii~puter 216 or
S remote computer 232 may then use this weather information in conjunction
with a database or lookup table of action categories to adjust the application
of
chemicals to the road based on the current or predicted impending conditions
in addition to application adjustments for actual real time road conditions as
above described. The weather information may also be used to alert other
vehicles and locations as to adverse conditions. The computer 216 preferably
provides control functions which include automated control of the chemical
spreader system 42 as has been described with reference to embodiments 1 and
2 above except that the proportioning controls are preferably automatically
implemented rather than relying on the operator to manipulate the knobs and
switches.
In addition, the computer 216 may also automatically control operation
of a snow plow 240 mounted on the vehicle 40. For example, a snow plow
240, shown mounted on a vehicle 40 in a schematic plan view in Fig. 11, and,
in a side view in Fig. 12, may be provided that has at least one movable side
discharge blocking plate 242 which is power operated, either hydraulically,
electrically, or pneumatically, to raise the blocking plate 242 to permit side
discharge of snow or lowered to prevent discharge of snow as the vehicle 40
passes a feature such as a residential driveway. The plow 244 may also be
fitted with at least one extensible blade 244, preferably on the opposite end
of
the plow 240 from that carrying the blocking plate 242 which can be
automatically extended or retracted in width via a hydraulic cylinder 246
depending upon the lane width at a particular location. The extensible blade
244 may be horizontally translated back and forth to extend the blade or it
may
be pivotally connected to the plow 240 and rotated to extend the plow path.
The plow 240 may be pivoted left or right or raised and lowered by multiple
cylinders 247.
CA 02487193 1997-11-18
The remote computer 232 rnay be connected to other sources of data
such as other computers via a data transfer device 252. Also, to provide local
input, a keyboard 254 or other input device is preferably connected to the
remote computer 232. Similarly a display 256 would be provided for the
5 operator of the remote computer 232.
Since the position of driveways, intersections, lane widths, obstructions,
etc. can be included in the GIS database stored in the computer 212, and the
GPS receiver can provide accurate position information for the vehicle 40, the
computer 2I6 can be easily programmed to lower the discharge blocking plates
10 as the vehicle passes a driveway or extend or retract the blade or change
its
configuration as appropriate for the lane width on a particular stretch of
roadway. Alternatively, during a first pass of the vehicle 40 past a driveway,
the blade may be manually extended or retracted, or blocking plates lowered
and raised, and the position information sensed and fed back to the database
15 212 so that the computer 216 can "learn" or cause these actions to
automatically be performed during future passes.
The fluid control system for the plow 240 is conventional in design. It
typically will include solenoid actuated four way valves that supply and
relieve
hydraulic or pneumatic pressure to and from the actuating cylinders 248 for
the
20 side blocking plates 242 and the cylinder 246 for the extensible blade 244
in
accordance with manual control signals from the operator or automatic signals
from the computer 216.
Position markers, such as a magnetic strip, may be provided along the
roadway and a local position sensor 250 such as a magnetic pickup may be
25 mounted on the vehicle 40 to provide local sensing input for the driveway
or
other obstacle position to trigger movement of the blocking plates 242 or
changes in the blade width or reposition the blade to avoid obstacles. These
local position markers and corresponding local position sensors 250 rnay also
be used to temporarily change the spreader discharge configuration as a
driveway or obstacle is passed, rather than utilizing GPS data. It should be
understood that GPS data and GIS data may be combined with use of local
CA 02487193 1997-11-18
26
markers and local position sensors~n a variety of combinations. For example,
the use of local position markers and vehicle mounted sensors 250 may be
particularly advantageously used during road construction activities to
automatically override information provided by the GPS and GIS data. The
S computer 2I6 may be programmed to utilize the GPS and GIS data unless
superseded by trigger of the local sensor 250 or superseding manual control by
the operator.
Further, fhe computer 216 is preferably programmed utilizing well
known decision making software techniques to compare the stored historical
surface condition data and records of any remedial action previously taken
during previous passes at the particular location, with current environmental
forecast information, current road surface condition information; and past
site
specific environmental forecast data in order to predict present and future
conditions at the current location. This process can be further enhanced by
I S tracking on board the on board material contents and dispensing rates in
order
to predict when or if the truck 40 or an additional truck should return to the
particular location. This information could then be relayed to the stationary
remote location 232 or to another vehicle in the network (if the truck
computers are so arranged) to forecast future service schedules.
In another, more localized application, the computer 216 can compare
current road conditions through use of any of the sensing systems disclosed in
U.S. Patent No. 5,619,193 and as shown in Fig. 9 along with on board
monitoring of the spreader capabilities, the fluid materials on hand, the GPS
signals, and weather information received from the remote computer 232 and
continually provide the operator with direction as to whether to retrace his
route to make additional applications to the roadway. This automated system
can thus optimize application of granular and liquid conditioning materials
throughout an adverse weather pattern or storm and tailor the application
based on past actions and current surface conditions. For example, in spots
where unusual winds are encountered or drifting occurs, additional.material
applications may be required. These areas are generally predictable such that
CA 02487193 1997-11-18
27
the database 212 will reflect these historical conditions therefore making
the.
automatic control apparatus and system of the present invention particularly
useful in consistently treating road surfaces in an optimum manner.
Finally, actual surface conditions and observations may also be inputted
to the computer 216 via the keyboard 226 or other input device in those
circumstances that are not predicted or need correction. An example of this
situation might be where the traffic patterns at a particular location or
along a
particular route differ at different times. If the traffic is heavy, as during
rush
hour, more mixing on the surface of the applied chemicals and granular
materials takes place and therefore a different application mixture might be
more appropriate than the computer generated amounts and proportions. If
the historical data at this location involved non rush hour circumstances, the
predicted requirements may need to be corrected by the operator.
The apparatus and system in accordance with the present invention has
been described with reference to particular embodiments thereof. These
embodiments are shown by way of examples and not by way of limitation.
There are many changes, alternatives, variations, and modifications to these
embodiments that will be readily apparent to those skilled in the art. For
example, additional sensors may be provided to the computer 216 in order to
provide more up to date local information. For example, a wind speed and
direction sensor, dew point, indicator and/or temperature sensor may be
provided on the vehicle 40 which the computer 216 can use to modify the
weather data provided by the remote computer 232 in order to tailor
application of materials more exactly to local conditions and requirements.
Accordingly, it is intended that all such alterations and variations and
modifications to the embodiments be included within the scope of the present
invention as defined by the appended claims.
