Note: Descriptions are shown in the official language in which they were submitted.
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SWIPE AND TAP VERIFICATION FOR ENTRY SYSTEM
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application claims the benefit of U.S. Provisional
Application No. 62/012,751 filed June 16, 2014 and U.S. Application No.
14/728,052 filed June 2, 2015. The entire disclosure of the above applications
is
incorporated herein by reference.
FIELD
[0002] The present disclosure relates generally to an entry system for
motor vehicles and, more particularly, to a keyless entry system having a two-
step operational functionality.
BACKGROUND
[0003] This section provides background information related to the
present disclosure which is not necessarily prior art.
[0004] Many passenger vehicles and trucks are now equipped with
keyless entry systems alone or in combination with a traditional mechanical-
type
(i.e. key) entry system. In many instances, the keyless entry system includes
a
portable device, such as a key fob, having pushbuttons that can be manipulated
to unlock/lock the vehicle doors as well as perform other functions (i.e.
selective
activation of alarms, headlights and/or the ignition system) through encoded
RF
signals transmitted to a vehicle-installed receiver. Typically, the signals
supplied
to the receiver are primarily used to control the selective locking and
unlocking of
a power-operated door latch mechanism.
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[0005] Certain vehicles may be equipped with a vehicle-mounted
keyless entry system. Typically, a touch device, such as a keypad, is mounted
to
the vehicle in close proximity to the door handle (i.e. on the door or the B-
pillar)
which enables an authorized user to enter a passcode consisting of a sequence
of alpha or numerical codes. Upon verification of the passcode, an on-board
controller unit controls operation of the power-operated door latch mechanism.
The keypad may also be used to control other vehicle operational functions
such
as, for example, power release of the gas tank cover or the tailgate lift
system
following entry and verification of the correct passcode. Some keypads use
pushbuttons and/or switches to enter the authentication code. One example of a
touchless keyless entry keypad associated with a vehicle entry system is
disclosed in U.S. Patent No. 8,400,265 the entire disclosure of which is
herein
incorporated by reference. As disclosed in the '265 patent, a plurality of
proximity sensors, such as capacitive sensors, are used to as the code input
interfaces associated with the keypad.
[0006] Still other vehicles may be equipped with a passive keyless
entry (PKE) system which utilizes a transmitter carried by the user to provide
a
signal to the vehicle-mounted receiver for controlling activation of the power-
operated door latch mechanism with some limited tactile input from the user.
Typically, close proximity of the transmitter to the vehicle and a single
action,
such as touching the door handle or waving in proximity to a motion detector,
act
to control the locking and unlocking function of the vehicle door.
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[0007] While such keyless entry systems have found widespread
applications in vehicle door systems (i.e. passenger doors, tailgates and
closure
doors), a need exists to continually advance the art and address known
deficiencies associated with conventional keyless entry systems. For example,
a
need exists to provide additional authentication protocol to improve security
and
limit unintended access to the vehicle's passenger and/or storage
compartments.
Another need to be addressed includes limiting electrical power usage
associated with "false activation" of the keypad caused by inadvertent inputs
to
the keypad. Such inadvertent inputs can, for example, be caused by rain,
flying
debris or carwash spray jets contacting the capacitive sensors associated with
the keypad. As a byproduct of solving such deficiencies, inadvertent operation
of
the door latch mechanism will be prevented to maintain the door in its proper
locked or unlocked state.
[0008] A need therefore exists for an improved method and system of
keyless entry of passenger entry doors and closure members in motor vehicles
and other devices. Accordingly, a solution that addresses, at least in part,
the
above-noted shortcomings and advances the art is desired.
SUMMARY
[0009] This section provides a general summary of the present
disclosure and is not intended to be interpreted as a comprehensive disclosure
of
its full scope or all of its features, aspects and objectives.
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[0010] Accordingly, it is an aspect of the present disclosure to
provide
a first user-input interface in conjunction with a second user-input interface
to
shift a component required to actuate a functional operation of a motor
vehicle
from an "inactive" mode into an "active" mode. The first user-input interface
is
configured to sense a force-based first user input while the second user-input
interface is configured to sense a non-force based second user input. A
controller is configured to receive the first and second user inputs and
control
shifting of the component from its inactive mode into its active mode in
response
to receipt of the first and second user inputs within a predetermined time
period.
[0011] It is another aspect of the present disclosure that the first
and
second user-input interfaces be associated with an exterior surface of the
motor
vehicle.
[0012] It is another aspect of the present disclosure that the first
user-
input interface and the second user-input interface are associated with a
touch
device such as, for example, a keypad accessible from outside of the motor
vehicle. The first user-input interface being defined by a mechanical switch
and
the second user-input interface being defined by at least one capacitive touch
device.
[0013] According to a further aspect of the present disclosure, the
controller is configured to shift the component from its inactive mode into
its
active mode in response to the first user input being received after receipt
of the
second user input and within the predetermined time period.
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[0014]
According to an optional aspect of the present disclosure, the
controller is configured to shift the component from its inactive mode into
its
active mode in response to the first user input being received prior to
receipt of
the second user input and within the predetermined time period to define a
"wake-up" functionality.
[0015]
Accordingly, it is an aspect of the present disclosure to provide
a first user-input interface in conjunction with at least one second user-
input
interface to establish an "active" mode for a keyless entry system of the type
well-suited for motor vehicle applications. The
first user-input interlace is
configured to sense a force-based first user input applied to a mode device
for
the purpose of shifting the keyless entry system from a low-power "inactive"
mode into the active mode. The second user-input interface is configured to
sense a non-force based second user input and preferably includes a proximity
device, such as a capacitive sensor or other suitable touch device. A
controller is
also associated with the keyless entry system which receives the first and
second user inputs from the first and second user-input interfaces and
controls a
vehicular operation in response to receipt of the first and second user inputs
within a predetermined time period.
[0016] It is
another aspect of the present disclosure to configure the
mode device as a mechanical switch in association with a vehicle-mounted
keypad of the keyless entry system. The keypad may also include a plurality of
capacitive input sensors providing means for inputting the second user inputs.
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[0017] It is another aspect of the present disclosure to provide the
mode device in association with a passive keyless entry system.
[0018] It is another aspect of the present disclosure to provide a
keypad assembly for a keyless entry system equipped with a touch switch having
"swipe and tap" functionality.
[0019] It is a related aspect to provide such a swipe and tap touch
switch in conjunction with a passive entry-passive start (PEPS) keyless entry
system.
[0020] The swipe and tap touch switch is normally maintained in a low
quiescent current or "stand by" state until a swipe dependent user-input
interface
detects a vertically directed user input (i.e. an upward swipe motion) applied
to
an activation or 'Wake-Up' touch switch. Upon detection of this swiped user
input, the touch switch is shifted into a high quiescent current or 'Run'
state
permitting operation of a second user input such as, for example, a tap
dependent input for controlling lock/unlock functionality.
[0021] These and other aspects and areas of applicability will become
apparent from the description provided herein. The description and specific
examples in this summary are intended for purpose of illustration only and are
not intended to limit the scope of the present disclosure.
DRAWINGS
[0022] The drawings described herein are for illustrative purposes
only
of selected embodiments and not all implementations, and are not intended to
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limit the present disclosure to only that actually shown. With this in mind,
various
features and advantages of example embodiments of the present disclosure will
become apparent from the following written description when considered in
combination with the appended drawings, in which:
[0023] FIG. 1 is a perspective side view of a motor vehicle equipped
with a keyless entry system;
[0024] FIG. 2 is a block diagram generally depicting the various
components of the keyless entry system;
[0025] FIG. 3 is an exploded pictorial view of a keypad assembly
adapted for use with the keyless entry system of the present disclosure;
[0026] FIG. 4 illustrates a front view of a capacitive touch pad
printed
circuit board (PCB) associated with the keypad assembly of FIG. 3;
[0027] FIG. 5 illustrates a rear view of the capacitive touch pad PCB
shown in FIG. 4;
[0028] FIG. 6 illustrates the connector harness used for connecting
the
keypad assembly to an electronic controller unit;
[0029] FIG. 7 lists the plurality of available output codes associated
with activation of each capacitive sensing device associated with the
capacitive
touch pad PCB;
[0030] FIG. 8 illustrates the configuration of a keypad touch plate
for
the keypad assembly of the present disclosure and which is adapted for use
with
a driver-side front door of the motor vehicle;
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[0031] FIG. 9 illustrates a configuration for a keypad touch plate for
a
keypad assembly adapted for use with the rear doors and the passenger-side
front door;
[0032] FIG. 10 is a photograph of the keypad assembly installed within
a cover plate assembly adapted to be mounted to a B-pillar of the motor
vehicle;
[0033] FIG. 11 is an illustration of the keypad assembly of FIG. 10
with
a cover portion of the cover plate assembly removed for improved clarity;
[0034] FIGS. 12 and 13 are additional views of the keypad assembly
mounted in the applique of the cover plate assembly;
[0035] FIG. 14 illustrates a circuit for implementing a method of
controlling operation of the keyless entry system of the present disclosure;
[0036] FIG. 15 illustrates an example configuration of a keypad touch
plate for a keypad assembly of the present disclosure which is adapted for use
with a driver-side front door of a motor vehicle and includes a swipe and tap
touch switch;
[0037] FIG. 16 illustrates a configuration for a keypad touch plate
for a
keypad assembly adapted for use with the rear doors and the passenger-side
front door and which is equipped with the swipe and tap touch switch;
[0038] FIG. 17 illustrates a logic circuit diagram for the swipe and
tap
touch switch of FIGS. 15 and 16;
[0039] FIG. 18 illustrates a swipe and tap touch switch having a dual
zone capacitive input interface and a dual zone illumination configuration;
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[0040] FIG. 19 illustrates a dual-zone capacitive touch switch
configuration adapted for use with the swipe and tap touch switch of the
present
disclosure;
[0041] FIG. 20 is a partially-sectioned view of the dual-zone touch
switch constructed according to the present disclosure;
[0042] FIG. 21 illustrates the dual-zone illumination pattern
associated
with the swipe and tap touch switch of the present disclosure;
[0043] FIG. 22 is another illustration of the dual zone illumination
configuration for the swipe and tap touch switch;
[0044] FIG. 23 is yet another illustration showing a partially-
sectioned
view of the swipe and tap touch switch;
[0045] FIGS. 24A and 24B illustrate a front view of the dual zone
swipe
and tap touch switch;
[0046] FIGS. 25 and 26 provide example plots of capacitive inputs for
the swipe-up and tap inputs, respectively; and
[0047] FIG 27 illustrates a dual capacitive and button tap
configuration.
[0048] Corresponding reference numerals indicate corresponding parts
throughout the various views of the drawings.
DETAILED DESCRIPTION
[0049] In the following description, details are set forth to provide
an
understanding of the present disclosure. In some instances, certain circuits,
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structures and techniques have not been described or shown in detail in order
not to obscure the disclosure.
[0050] In
general, the present disclosure relates to keyless entry
systems of the type well-suited for use in virtually all motor vehicle
applications.
The keyless entry system of this disclosure will be described in conjunction
with
one or more example embodiments.
However, the specific example
embodiments disclosed are merely provided to describe the inventive concepts,
features, advantages and objectives will sufficient clarity to permit those
skilled in
this art to understand and practice the disclosure.
[0051] More
specifically, the present disclosure relates to a vehicular
system for providing access to a component required to activate a vehicle
operation wherein the system includes a first user-input interface associated
with
an exterior surface of the vehicle which is configured to sense a first user
input
that is dependent on an applied force, a second user-input interface external
to
the vehicle which is configured to sense a second user input that is
independent
of an applied force, and a controller configured to control at least the
component
in accordance with the second user input received at the second user-input
interface provided that the first user-input interface receives the first user
input
within a predetermined time before or after receipt of the second user input
at the
second user-input interface. One example of such a vehicular system is a
keyless entry system for controlling locking and unlocking of a power-operated
actuator of a door latch mechanism wherein the first user-input interface is
defined by a mechanical switch and the second user-input interface is defined
by
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a capacitive touch device. The keyless entry system may include a touch
device,
such as a keypad, mounted to an external surface of the vehicle and have both
the first user-input interface and at least one second user-input interface
associated with the keypad. The keyless entry system should be understood to
also contemplate power release functionality of lift gates and any other
closure
members capable of being locked/unlocked and/or released in association with a
motor vehicle.
[0052] The
present disclosure further relates to a vehicular system for
providing access to a component required to activate a vehicle operation
wherein
the system includes a first user-input interface associated with an exterior
surface of the vehicle which is configured to sense a first user input, a
second
user-input interface external to the vehicle and configured to sense a second
user input, and a controller configured to control the component in accordance
with the second user input being received at the second user-input interface
within a predetermined time before or after receipt of the first user input
being
received at the first user-input interface. The first user-input interface is
a touch
switch operable to detect an upwardly directed "swipe" user input operable for
shifting the switch from a low-power "Stand-By" mode into a high-power
operational or Run' mode. The second user input may, for example, be a tap-
type input applied to the switch, or a separate button or second switch, which
is
operable to control lock and unlock functions of a power-operated actuator of
a
door latch mechanism associated with a keyless entry system.
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[0053] Referring initially to FIG. 1, a side view of a motor vehicle
10 is
shown partially cut away to include a front driver-side door 12 and a rear
driver-
side door 13 which both provide access to a passenger compartment 14. Front
door 12 is shown to include a door handle 16 and a key hole 18 provided for
otherwise conventional locking and unlocking of a mechanically-activated latch
mechanism (not shown) mounted within front door 12. Movement of door handle
16 functions to release door 12 for movement relative to body portion 24 when
the latch mechanism is unlocked. A similar door handle (not shown) would be
provided on rear door 13 and interconnected to another latch mechanism (not
shown) provided for locking and unlocking rear door 13. As will be detailed,
each
of the latch mechanisms may also include a power-operated actuator for
controlling the locking and unlocking functions in association with a keyless
entry
system. Motor vehicle 10 is shown to also include an A-pillar 20, a B-pillar
22
and a roof portion 26.
[0054] In the example shown in FIG. 1, B-pillar 22 is covered by a
cover plate assembly 28. A keypad assembly 30 associated with the keyless
entry system of the present disclosure is mounted to B-pillar 22 within cover
plate
assembly 28 at the location identified by the dashed lines. Keypad assembly 30
is mounted between a structural portion of B-pillar 22 and cover plate
assembly
28. As an alternative, keypad assembly 30 could be mounted to front door 12 in
proximity to handle 16.
[0055] Referring now to FIG. 2, a block diagram of various components
of the keyless entry system is provided. As seen, keypad assembly 30 includes
12
,
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or is connected to a processing unit 32 which, in turn, communicates with a
controller unit 34. Controller 34 provides an electrical output along line 36
to a
power-operated actuator of a door latch mechanism 38. As is known, controller
unit 34 may also provide electrical outputs along lines 40 for controlling
other
vehicular systems 42 (i.e. power release of a trunk or liftgate, actuation of
the
lights and/or security functions, and activation of the ignition system and/or
the
vehicle's heating system, etc.). A power source, such as a battery 44, may
provide power to processing unit 32. As will be detailed, keypad assembly 30
includes a capacitive touch keypad unit 46, a capacitive touch lock switch 48
and
a force-dependent mode input device 50.
[0056]
The operation of the keyless entry system of FIG. 2 is
configured to permit selective access to passenger compartment 14 via front
door 12 or, in the alternative, both doors 12, 13 when the operator
(hereinafter,
the "user") enters an authorization code via keypad unit 46. The
authentication
code entered is transmitted to processing unit 32 where it is compared to a
correct or verification code stored in memory. If the entered passcode matches
the verification code, a signal is sent to controller unit 34 which, in turn,
will
unlock latch mechanism 38 and permit operation of door handle 16 to release
front door 12 (or both doors 12, 13) and allow access to passenger compartment
14. Those skilled in the art will recognize that this rudimentary control
diagram is
merely an example of only one suitable arrangement for the keyless entry
system.
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[0057] Referring now to FIGS. 3 through 8, keypad assembly 30 is
shown with keypad unit 46 configured to define a user-input touch interface
adapted to sense user inputs based on a characteristic that is independent of
force. Keypad unit 46 has a touch pad 60, a capacitive touch pad PCB 62, and a
wiring harness 64. Touch pad 60 includes five (5) touch user-input interfaces
or
nodes, best shown in FIG. 8 to include a first (1-2) touch node 60A, a second
(3-
4) touch node 60B, a third (5-6) touch node 600, a fourth (7-8) touch node
60D,
and a fifth (9-0) touch node 60E. A visual indicator 66 is also associated
with
touch pad 60. Touch pad 60 is secured to capacitive touch pad PCB 62 which
includes a first side 68 (FIG. 4) and a second side 70 (FIG. 5). First side
68,
referred to as the user finger touch side, includes six (6) high brightness
LED's.
Five LED's, identified by reference numerals 72A-72E, correspond and function
to illuminate a corresponding one of the five touch nodes 60A-60E while the
sixth
LED 74 provides illumination to visual indicator 66. The second side 70 of
touch
pad PCB includes a keypad microcontroller 75 interactive with five (5)
capacitive
input devices 76A-76E, each corresponding to one of touch nodes 60A-60E on
touch pad 60. Wiring harness 64 includes an output connector 80 electrically
connected to capacitive touch pad PCB 62, an input connector 82 adapted to be
electrically connected to the controller unit, hereinafter referred to as a
body
control module (BCM) 84, and a multi-wire assembly 86.
[0058] As seen in FIG. 3, an applique 90 associate with a cover plate
assembly 28 includes a guide channel 94 configured to receive and retain touch
pad 60 and capacitive touch pad PCB 62 therein. Applique 90 is adapted to be
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mounted to B-pillar 22 of vehicle 10. Applique 90 can be made from a tinted
black or dark polycarbonate or acrylic to appear opaque in sunlight, darkness
and artificial light to provide an aesthetic appearance. LED 72A-72E
illuminate to
permit visual indication of touch nodes 60A-60E for activation thereof by the
user.
Obviously, touch pad 60 can alternatively be mounted so as to be directly
accessible and extend from applique 90. As noted, keypad assembly 30 could
also be mounted to driver door 12 if so desired.
[0059] FIG. 7 is provided to illustrate that each touch node or
user
interface has an output code from BCM 84 such that a correctly entered
sequence of user inputs will authenticate the pass code to permit BCM 84 to
signal keypad microcontroller 75 to send an actuator signal to the power-
operated activator of door latch mechanism 38.
[0060] A pair of user-input interface devices associated with
lock switch
48 are shown in FIG. 8 to include a first or "LOCK" touch node 100 and a
second
or "RELEASE" touch node 102. Preferably, nodes 100 and 102 are capacitive
type sensing devices similar in function to touch nodes 60A-60E on touch pad
PCB 62. In addition, a user input device associated with mode input device 50
is
shown to include a "wake-up" switch or button 104. Wake-up button 104 is a
mechanical switch providing a user-input interface that is configured to sense
a
user input based on a force or pressure value applied thereto. As such, a
distinct
type of activation input is associated with wake-up button 104 than is
required for
capacitive keypad unit 46 and capacitive lock switch 48. In operation, after
the
correct combination of user-input interface options 60A-60E are asserted, the
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Lock/Release user inputs associated with functions 100 and 102 become
available. As will be detailed further, wake-up button 104 defines a "first"
or
force-based user-input interface while keypad touch device 46 defines a
"second"
or non-force based user-input interface. Activation of force-based wake-up
button 104 either before or after activation of the non-force based touch
device
46, within a predetermined amount of time, will function to authenticate the
inputted passcode and permit the required activation of latching mechanism 38
via Lock/Release functions 100, 102. Those skilled in the art will appreciate
that
the Lock/Release functionality provided by lock switch 48 can be eliminated if
desired such that the Release function may occur automatically upon correct
entry of the passcode sequence while the Lock function may occur upon
pressing touch nodes 60D and 60E simultaneously.
[0061] FIG. 9
illustrates a touch pad configuration fora keypad unit 110
adapted for use with rear passenger doors 13 of vehicle 10 and/or the front
passenger-side door of vehicle 10. As seen, keypad unit 110 is similar to
keypad
unit 46 except that the non-force based user-input interfaces (i.e. touch
nodes
60A-60E) have been eliminated. Wake-up switch 104' is still a force-based
switch to provide an intentional user-input interface that is required to
shift
keypad unit 110 from its inactive mode into its active mode of operation. Lock
function 100 and release function 102 are similar to those described
previously.
As an alternative to the non-force based user inputs associated with touch
nodes
60A-60E and Lock/Release functions 100, 102, the capacitive touch input
devices may be substituted with other proximity-type sensing technologies. In
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any arrangement, keypad units 46, 110 must be shifted into its active mode via
activation of wake-up switch 104, 104' prior to BCM 84 signaling keypad
microcontroller 25 to authenticate the inputted passcode sequence and activate
door latch 38.
[0062]
Referring now to FIGS. 10 through 13, a B-pillar keypad
assembly 120 is shown to include cover plate unit 92 having applique 90
mounted to a cover plate 122. FIG. 10 illustrates the location of Lock node
100,
Release node 102, and wake-up switch 104, while the capacitive user-input
interfaces on keypad assembly 30 are not illuminated. Lock switch 48 is also
mounted to cover plate 122 and integrates the Lock/Release capacitive type
user-input interfaces 100, 102 in a common unit with the force-based user-
input
interface of wake-up switch 104.
Obviously, the arrangement can be
reconfigured in many alternative arrangements such as incorporating touch
nodes 60A-60E and Lock/Release touch nodes 100, 102 into a common keypad
and microcontroller assembly while maintaining wake-up switch as a separate
device. Regardless of the arrangement, the keyless entry system of the present
disclosure has a first user-input interface for providing an actuation or
"wake-up"
function and one or more second user-input interfaces for providing the
authentication function prior to activation of the door lock.
[0063]
Referring to a circuit diagram shown in FIG. 14, a circuit 200 is
provided for implementing the systems and methods of the present disclosure
and includes a keypad ECU 202, an electrically-activated latch ECU (Elatch
ECU) 204, and a body control module (BCM) 206. Circuit 200 is configured to be
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implemented along with a touch device 208 that is identical in function to
that
keypad unit 46 previously described. Wake switch 210 is shown included in
keypad ECU 202. Wake switch 210 may be implemented with any circuit
element that provides a switching capability such as, for example, a
transistor.
Wake switch 210 is initiated when the user asserts wake-up button 104 shown
herein as a push button on the keypad. Once wake switch 210 has been closed,
an indication via a passive entry/passive start (PEPS) lock out wire 212 is
transmitted to Elatch ECU 204. While FIG. 14 shows connections with wires,
those skilled will appreciate that wireless connections are also possible and
contemplated.
[0064] Keypad ECU 202 may be supplied with power via a battery
(Vbatt) 214 after wake switch 210 has been closed. If wake switch 210 is
closed,
the passcode entered via touch input device 208 may be transmitted to BCM 206
via Out wires 216, 218, 220. Thereafter, BCM 206 transmits an indication that
the enter code is verified and authenticated via LED line 222. Accordingly, a
command signed transmitted via a latch release line 224 is delivered to Elatch
ECU 204 instructing it to perform an operation such as, for example, releasing
the door latch mechanism. Once the door is thereafter opened or subsequently
closed, wake switch 210 is opened.
[0065] While the terms "wake" and "wake-up" have been used to
describe force-based switches 104, 104' and 210, it will be understood that
this
nomenclature is only used to describe the function of these switches to shift
the
keyless entry system into an active mode. As has been clearly stated,
assertion
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of the first force-based user-input interface can occur either before or after
assertion of the second capacitive-based user-input interface(s) to shift the
keyless entry system from an inactive mode into an active mode, contingent on
receipt by the controller of both of the first and second user inputs within a
predetermined time period. One non-limiting example of a predetermined time
period for input of both user input is in the range of 5-15 seconds.
[0066] In addition, the terms "inactive/stand-by" and "active/run" are
intended to describe the status of the controller to actuate the vehicle
component
such as, for example, the power door latch mechanism. In the inactive mode,
the
keypad is still operable to receive the capacitive second user input(s) to
provide
passcode verification. However, assertion of the force-based first user input
is
required to confirm the verification process and allow the controller to send
an
actuation system to the vehicle component. Thus, a two-step authentication
process is provided.
[0067] The present disclosure is also directed to keypad assemblies
for
use in keyless entry systems (i.e. passive entry and/or passive start) having
a
touch switch with "swipe and tap" functionality. An upwardly directed swipe
motion applied to or in close proximity with the touch switch functions to
shift the
switch from a "stand-by" or low current state to a "run" or high current
state. The
upward swipe is provided to eliminate or significantly limit occurrences of
false
activation of the touch switch caused by rain. In this regard, the touch
switch
also includes a dual zone illumination image configuration and capacitive
switch
arrangement, with the image displayed on an applique of the vehicle. The image
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displayed indicates, for example, the state of the door latch mechanism (i.e.
locked or unlocked) when the user approaches the vehicle. One part of the
image is displayed in a certain color when the door is unlocked. In contrast,
both
parts will be displayed in different colors when the door is locked.
[0068] The capacitive touch switch is required to make full contact
(i.e.
no air gaps) with the applique, which can limit the packaging available for a
two
part/two color image display. As is known, there are problems with false
activations of capacitive switches in externally-mounted keypads/appliques in
automotive applications due to water contact. During a rainstorm or car wash,
the water can contact the user-input interface and cause electrical activation
of
the capacitive switch. This, in turn, can cause the system to switch from a
low
power state to a high power state (i.e. LED display with 20 milliamp current
draw). Such unintentional current draw is undesirable. Accordingly, a switch
housing or applique is provided which separates the two parts of the image
into
different zones so that each zone can be lit independently without light
bleeding
through to the other zone. To accomplish this, an opaque barrier, provided in
either the switch housing or the applique, creates two distinct zones with
each
zone capable of transmitting light through an image without light
contamination to
the other zone. The use of double-sided adhesive tape to bond the printed
circuit
board (PCB) to the switch housing and to bond the switch housing to the
applique eliminates air gaps.
[0069] In one configuration, LED's are mounted into holes in the PCB
to create the necessary light required to display the image. Preferably, two
(2)
CA 02894297 2015-06-10
LED's are used to light two different color image portions of the image (i.e.
the
lower half) while a single LED lights the upper half of the image. An example
image can be a lock icon.
[0070] The
logic utilized to eliminate false water activations includes
the operator inputting a "swipe-up" motion to activate two separate capacitive
contact zones or pads in sequence. The
controller unit recognizes this
sequential capacitive input and switches the system from a low power state
into a
high power state. The system has three (3) stages of operation including a
stand-by stage, a wake-up stage, and a full-run stage. Accordingly, a two
capacitive sensor/pad configuration oriented vertically provides means for
shifting
from the low power stand-by mode into the wake-up mode. A low frequency
scan is used in the low quiescent current stand-by state. It acts as a waiting
mode for user to wake-up the touch switch and enter the command (swipe-up).
The Run state is transitioned when the wake-up state is detected. In this
state,
quiescent current is not a concern and capacitive sensors are run at high scan
frequency. Preferably, in order to positively identify a LOCK command in the
Run state ¨ both sensing elements (i.e. the upper and lower capacitive inputs)
need to be triggered.
[0071]
Referring to FIG. 15, an example configured of a keypad plate
600 for a keypad assembly 46' is shown which is generally similar to keypad
plate 60 of FIG. 8 with the exception that capacitive input-interfaces 100,
102 for
the LOCK/UNLOCK functions has been replaced with a swipe and tap (S/T)
touch switch 602. Similarly, keypad plate 700 of FIG. 16 is generally similar
to
21
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keypad plate 110 of FIG. 9A except that the LOCK/UNLOCK function switches
100, 102 have again been replaced with a SIT touch switch 702. Generally
speaking, touch switch 602, 702 is configured to include a first or lower
capacitive input interface and a second or upper capacitive input interface
aligned vertically and operatively arranged to detect an upwardly directed or
"swipe-up" sequential input. Upon detection of the swipe-up input, the
controller
(as previously disclosed) shifts the keyless entry system from a switch "stand-
by"
state to a switch "wake-up" state. In the wake-up state, a "tap" input to one
or
both capacitive input interfaces (as required to meet lock/unlock control)
provides
a switch "run" state wherein one of the functional operations of the LOCK or
UNLOCK modes is available.
[0072] FIG.
17 illustrates an example logic circuit 800 for touch
switches 602, 702 for a passive entry/passive start (PEPS) entry system.
Specifically, block 802 indicates the T/S touch switch is operational in its
low
power (i.e. lower quiescent current) condition. A low frequency scan of the
status
of switch 602, 702 is performed. A decision block 804 determines whether a
swipe-up input has been detected. If not, switch 602, 702 is maintained in its
stand-by mode. If
yes, switch 602, 702 is shifted into a wake-up state.
Thereafter, a tap inputted to switch 602, 702 shifts it into its Run state, as
shown,
at block 806, and allows the subsequent tap input to perform either of a
desired
(i.e. Lock or an Unlock) function. A high frequency scan is performed in the
Run
state and switch 602, 702 is now functioning in a high power (i.e. high
quiescent
currant) condition. Line 808 indicates that the tap input into touch switch
602,
22
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702 must be completed within a predetermined time period to authenticate the
input. If the tap input is not authenticated after expiration of the time
period,
switch 602, 702 returns to its stand-by state.
[0073]
Referring now to FIGS. 18-21, a T/S touch switch 900 adapted
for use with either lock switch 602 of FIG 16 and lock switch 702 of FIG 16
will
now be described in greater detail. Touch
switch 900 is preferably
molded/inserted into an applique 902 adapted to be mounted to an external
surface of the recess. Touch switch 900 includes a first capacitive switch pad
904 associated with a first or lower portion 906 of an applique recess and a
second capacitive switch pad 908 associated with a second or upper portion 910
of the applique recess. An opaque barrier 912 delineates lower portion 906
from
upper portion 910 to create a dual light zone. Upon assembly, second
capacitive
switch pad 908 is configured to be vertically aligned above first capacitive
switch
pad 904. As also shown, a pair of LED's 914, 916 are aligned with first
capacitive switch pad 904 while a single LED 918 is associated with second
capacitive switch pad 908.
[0074] FIG 19 illustrates a two-zone capacitive switch design
associated with PCB 920 of touch switch 900. PCB 920 illustrates circuitry for
a
lower zone 922 controlling operation of the first capacitive touch pad 904 and
an
upper zone 924 associated with second capacitive touch pad 908. The arrow
926 illustrates the directional input required to sequentially activate first
touch
pad 904 and second touch pad 908 to shift touch switch 900 from its stand-by
mode into its wake-up mode.
23
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[0075] FIG 20 illustrates a partially-sectioned view of touch switch
900.
Switch 900 includes a two-part symbol, such as a lock icon 930 having a
first/lower part 932 aligned with first capacitive pad 904 and a second/upper
part
934 aligned with second capacitive pad 908. Icon 930 is disposed between
applique 902 and a transparent switch cover 936. Electrical leads 938 are
provided to electrically interconnect switch 900 to controller unit 34. FIG 21
illustrates the dual zone illumination configuration with a lower dual color
first
zone 940 and an upper single color second zone 942 delineated by a horizontal
web 944 of the opaque barrier 912.
[0076] FIGS 22-24 illustrate a slightly modified version of touch
switch
900 that is generally similar to touch switch 900' with exception that it is
molded
into a switch housing 946.
[0077] FIG 25 provides an example plot of capacitive signal level vs.
time for a pair of different "swipe-up" inputs to touch switch 900, 900'.
Similarly,
FIG 26 provides an example plot for a pair of different "tap" inputs to touch
switch
900, 900'.
[0078] FIG 27 illustrates a touch switch 900'. Touch switch 900A is
shown to include a first capacitive touch pad 980 aligned vertically below a
second capacitive touch pad 982. A distinct "tap" pad 984 is disposed
centrally
between touch pads 980 and 982. Tap pad 984 can be a capacitive device, a
mechanical switch or any other suitable device capable of inputting a desired
functional command following sequential activation of pads 980, 982 via the
upward swipe input to switch 900A. An illuminated icon/display 988 is
associated
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with tap pad 984. Touch switch 900A is merely one possible alternative
configuration of swipe and tap switch of the present disclosure.
[0079] Those skilled in the art will also recognize that the present
disclosure has applicability to keyless entry system, both passive and non-
passive, for controlling actuation of additional vehicular functions. A non-
limiting
listing of such additional functions may include release of the gas tank cover
plate, power window control, power release of vehicular doors in addition to
lock/unlock functionality, and lock/unlock and power release of liftgates. It
should
also be recognized that the force-based user-input interface may be located
remotely from the capacitive-based user-input interfaces. The force-based
input
is not intended to merely wake-up or actuate the non-force based input, but
can
also be part of a multi-stage control protocol for controlling a vehicle
component.
The present invention also contemplates use of second user-input interfaces
for
gesture recognition control systems.
[0080] It should furthermore be understood that the present disclosure
is also applicable to passive keyless entry systems where the user possesses a
passive entry fob such that the first force-based user-input interface would
act as
a "request" button that is pushed in combination (either before or after)
performance of a single action such as for example, actuating a capacitive
touch
sensor on the door handle to lock and unlock/release the vehicle door. Once
the
recognized combination of request button engagement and the non-force based
single action input(s) are received by the controller, and the entry fob
confirms
CA 02894297 2015-06-10
authentication for access, then the vehicle is controlled to perform the
requested
function.
[0081] The
foregoing description of the embodiments has been
provided for purposes of illustration and description. It is not intended to
be
exhaustive or to limit the disclosure.
Individual elements or features of a
particular embodiment are generally not limited to that particular embodiment,
but, where applicable, are interchangeable and can be used in a selected
embodiment, even if not specifically shown or described. The same may also be
varied in many ways. Such variations are not to be regarded as a departure
from
the disclosure, and all such modifications are intended to be included within
the
scope of the disclosure.
[0082] Those
skilled in the art will recognize that the inventive concept
disclosed in association with an example keyless entry system can likewise be
implemented into many other vehicular systems to control one or more
operations and/or functions. Means
of activating the second user-input
interfaces (the touch interfaces on the keypad), other than touch may be
employed. The alternative to capacitive sensors may include, without
limitation,
touch sensitive sensors, resistive sensors, temperature sensors, optical
scanners, gesture sensors or any combination thereof provided that they are
non-force based inputs.
[0083]
Example embodiments are provided so that this disclosure will
be thorough, and will fully convey the scope to those who are skilled in the
art.
Numerous specific details are set forth such as examples of specific
26
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components, devices, and methods, to provide a thorough understanding of
embodiments of the present disclosure. It will be apparent to those skilled in
the
art that specific details need not be employed, that example embodiments may
be embodied in many different forms and that neither should be construed to
limit
the scope of the disclosure. In some example embodiments, well-known
processes, well-known device structures, and well-known technologies are not
described in detail.
[0084] The terminology used herein is for the purpose of describing
particular example embodiments only and is not intended to be limiting. As
used
herein, the singular forms "a," "an," and "the" may be intended to include the
plural forms as well, unless the context clearly indicates otherwise. The
terms
"comprises," "comprising," "including," and "having," are inclusive and
therefore
specify the presence of stated features, integers, steps, operations,
elements,
and/or components, but do not preclude the presence or addition of one or more
other features, integers, steps, operations, elements, components, and/or
groups
thereof. The method steps, processes, and operations described herein are not
to be construed as necessarily requiring their performance in the particular
order
discussed or illustrated, unless specifically identified as an order of
performance.
It is also to be understood that additional or alternative steps may be
employed.
[0085] When an element or layer is referred to as being "on," "engaged
to," "connected to," or "coupled to" another element or layer, it may be
directly on,
engaged, connected or coupled to the other element or layer, or intervening
elements or layers may be present. In contrast, when an element is referred to
27
CA 02894297 2015-06-10
as being "directly on," "directly engaged to," "directly connected to," or
"directly
coupled to" another element or layer, there may be no intervening elements or
layers present. Other words used to describe the relationship between elements
should be interpreted in a like fashion (e.g., "between" versus "directly
between,"
"adjacent" versus "directly adjacent," etc.). As used herein, the term
"and/or"
includes any and all combinations of one or more of the associated listed
items.
[0086] Although the terms first, second, third, etc. may be used
herein
to describe various elements, components, regions, layers and/or sections,
these
elements, components, regions, layers and/or sections should not be limited by
these terms. These terms may be only used to distinguish one element,
component, region, layer or section from another region, layer or section.
Terms
such as "first," "second," and other numerical terms when used herein do not
imply a sequence or order unless clearly indicated by the context. Thus, a
first
element, component, region, layer or section discussed below could be termed a
second element, component, region, layer or section without departing from the
teachings of the example embodiments.
[0087] Spatially relative terms, such as "inner," "outer," "beneath,"
"below," "lower," "above," "upper," and the like, may be used herein for ease
of
description to describe one element or feature's relationship to another
element(s) or feature(s) as illustrated in the figures. Spatially relative
terms may
be intended to encompass different orientations of the device in use or
operation
in addition to the orientation depicted in the figures. For example, if the
device in
the figures is turned over, elements described as "below" or "beneath" other
28
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elements or features would then be oriented "above" the other elements or
features. Thus, the example term "below" can encompass both an orientation of
above and below. The device may be otherwise oriented (rotated 90 degrees or
at other orientations) and the spatially relative descriptions used herein
interpreted accordingly.
29
