COMMUNICATION CHANNEL SWITCHING CIRCUIT FOR VEHICLE DIAGNOSIS EQUIPMENT

CIRCUIT DE COMMUTATION DE CANAL DE COMMUNICATION D'UN DISPOSITIF DE DIAGNOSTIC DE VEHICULE

English Abstract

Provided is a communication channel switching circuit of a vehicle diagnostic device, comprising: a plurality of communication channels (110) arranged on a circuit board (20); the communication channels (110) are connected to the pins of an on-board diagnostics (OBD) connector, respectively, by means of a plurality of switching elements (120); the circuit board (20) has through-holes (21) corresponding one-to-one to a plurality of switching elements (120); a switching element (120) comprises a first electrical contact element (121), a second electrical contact element (122), and a column body (123) which can move upward and downward; the cylinder body (123) passes through the through-hole (21), and the two are slidably fitted; the top of the column body (123) has an electrical conduction element (125) which can, when it moves downward, electrically contact, upward and downward, the first electrical contact element (121) and the second electrical contact element (122); a flexible self-restore element (126) is arranged between the electrical conduction element (125) and the circuit board (20); and a power source (124) used for driving the column body (123) to move upward and downward. The invention has the advantages of small size, low cost, stable functionality, applicability in high-power external circuits, and freedom from signal interference.

French Abstract

L'invention concerne un circuit de commutation de canal de communication d'un dispositif de diagnostic de véhicule, comprenant: une pluralité de canaux de communication (110) disposés sur une carte de circuit imprimé (20); les canaux de communication (110) sont reliés aux broches d'un connecteur de diagnostic embarqué (OBD), respectivement, au moyen d'une pluralité d'éléments de commutation (120); la carte de circuit imprimé (20) présente des trous traversants (21) correspondant de manière biunivoque à une pluralité d'éléments de commutation (120); un élément de commutation (120) comprend un premier élément de contact électrique (121), un deuxième élément de contact électrique (122), et un corps de colonne (123) qui peut se déplacer vers le haut et vers le bas ; le corps de cylindre (123) passe à travers le trou traversant (21), et les deux sont montés coulissants; la partie supérieure du corps de colonne (123) comporte un élément de conduction électrique (125) qui peut, lorsqu'il se déplace vers le bas, entrer en contact électrique, vers le haut et vers le bas, avec le premier élément de contact électrique (121) et le second élément de contact électrique (122); un élément d'auto-restauration flexible (126) est disposé entre l'élément de conduction électrique (125) et la carte de circuit imprimé (20) ; et une source d'alimentation (124) est utilisée pour entraîner le corps de colonne (123) à se déplacer vers le haut et vers le bas. L'invention présente les avantages d'une petite taille, d'un faible coût, d'une fonctionnalité stable, d'une applicabilité dans des circuits externes à haute puissance, et d'être insensible aux interférences de signal.

Claims

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Listing of claims
1. A communicafion channel switching circuit for vehicle diagnosis equipment,
comprising a
plurality of communicafion channels provided on a circuit board, each of the
plurality of
communicafion channels is respecfively connected with each of pins of an OBD
port by a
plurality of switches, through-holes one-to-one corresponding to the plurality
of switches
are provided on the circuit board and each of the plurality of switches
comprise:
a first electric contact and a second electric contact, the first electric
contact and the second
electric contact are provided beside a corresponding through-hole, wherein the
first electric
contact is connected with a corresponding communication channel, and the
second electric
contact is connected with a corresponding pin;
a vertically movable column, wherein the column passes the through-hole, the
column
engages with the through-hole by sliding, an electric conduction piece is
provided on a top
portion of the column, which when moving downwards will electrically contact
the first
electric contact and the second electric contact, and a flexible self-resuming
piece is
provided between the electric conduction piece and the circuit board;
and a power for driving the column to move vertically.
2. The communication channel switching circuit for vehicle diagnosis equipment
according to
claim 1, wherein a limiting piece is radially provided on a lower end of the
column.
3. The communication channel switching circuit for vehicle diagnosis equipment
according to
claim 1 or 2, wherein the power is an electromagnetic coil, wherein the
electromagnetic coil
is radially provided beside a lower end of the column and is fixed on the
circuit board, the
column is an insulated column and the electric conduction piece is of magnetic
metal
materials.
4. The communication channel switching circuit for vehicle diagnosis equipment
according to
claim 3, wherein the electric conduction piece is made of steel.
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5. The communicafion channel switching circuit for vehicle diagnosis equipment
according to
claim 5, wherein enable control of the electromagnefic coil is made by an MOS
driver circuit.
6. The communicafion channel switching circuit for vehicle diagnosis equipment
according to
claim 5, wherein the first electric contact and the second electric contact
are semi-circular
copper sheets, symmetrically provided beside the through-hole.
7. The communication channel switching circuit for vehicle diagnosis equipment
according to
claim 6, wherein the electric conduction piece comprises a horizontal rod, and
both ends of
the rod extend vertically downwards and form contact terminals corresponding
to the first
electric contact and the second electric contact.
8. The communication channel switching circuit for vehicle diagnosis equipment
according to
claim 17, wherein the flexible self-resuming piece is a spring, and the spring
is sleeved over
an upper end of the column.
9. The communication channel switching circuit for vehicle diagnosis equipment
according to
claim 8, wherein the through-holes are distributed in a matrix.
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Description

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COMMUNICATION CHANNEL SWITCHING CIRCUIT FOR VEHICLE DIAGNOSIS EQUIPMENT
Technical field
The present invention relates to a vehicle diagnosis technical field,
especially a communication
channel switching circuit for vehicle diagnosis equipment.
Background technology
Vehicle diagnosis equipment communicates with a vehicle control module, reads
corresponding
parameters, determines technical conditions of the vehicle, detects one or
more fault locations
and causes therefor, and is used to optimize vehicle operation and after-sales
maintenance.
There are a variety of communication modes for the vehicle control module,
such as 232
protocol, 485 protocol, 1708 protocol, CAN protocol, and K protocol etc., and
definitions of pins
in an OBD port of the vehicle are varied, to enable every communication
channel of the
diagnosis equipment to switch accurately to a pin corresponding to the OBD
plug, a switching
circuit is designed to switch the communication channel to the corresponding
pin, and the
circuit is usually designed to be a matrix circuit.
Currently there are two kinds of switching circuits for vehicle diagnosis
equipment available:
1. To make bus switch by a mechanical relay.
2. To make bus switch with a solid-state relay.
Wherein, mechanical relays are of big size and occupying a large space, and
solid-state relays are
costly, not stable, subject to signal interference, and cannot be used for
high power external
circuits, and especially with increase of the communication channels
(protocols), the foregoing
disadvantages will be magnified exponentially.
Summary of the invention
Based on the foregoing conditions and targeting at foregoing technical
problems, the present
invention provides a communication channel switching circuit for vehicle
diagnosis equipment.
To address the foregoing technical problems, the present invention adopts a
following technical
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solution:
A communication channel switching circuit for vehicle diagnosis equipment,
comprising a
plurality of communication channels provided on a circuit board, each of the
plurality of
communication channels is respectively connected with each of pins of an OBD
port by a
plurality of switches, through-holes one-to-one corresponding to the plurality
of switches are
provided on the circuit board and each of the plurality of switches comprise:
A first electric contact and a second electric contact, the first electric
contact and the second
electric contact are provided beside a corresponding through-hole, wherein the
first electric
contact is connected with a corresponding communication channel, and the
second electric
contact is connected with a corresponding pin;
A vertically movable column, wherein the column passes the through-hole, the
column engages
with the through-hole by sliding, an electric conduction piece is provided on
a top portion of the
column, which when moving downwards will electrically contact the first
electric contact and
the second electric contact, and a flexible self-resuming piece is provided
between the electric
conduction piece and the circuit board;
And a power for driving the column to move vertically.
A limiting piece is radially provided on a lower end of the column.
The power is an electromagnetic coil, wherein the electromagnetic coil is
radially provided
beside a lower end of the column and is fixed on the circuit board, the column
is an insulated
column and the electric conduction piece is of magnetic metal materials.
The electric conduction piece is made of steel.
Enable control of the electromagnetic coil is made by an MOS driver circuit.
The first electric contact and the second electric contact are semi-circular
copper sheets,
symmetrically provided beside the through-hole.
The electric conduction piece comprises a horizontal rod, and both ends of the
rod extend
vertically downwards and form contact terminals corresponding to the first
electric contact and
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the second electric contact.
The flexible self-resuming piece is a spring, and the spring is sleeved over
an upper end of the
column.
The through-holes are distributed in a matrix.
In the present invention, communication channels of the vehicle diagnosis
equipment can be
switched accurately to corresponding pins as required, the communication
channel switching
circuit for vehicle diagnosis equipment is suitable for use in application
conditions where each of
the multiple communication channels work independently, and is characterized
by advantages
such as of small size, low cost, functioning stably, applicable to external
circuits of high power
and free from signal interference etc.
Brief description of drawings
Hereinafter a detailed description will be given to the present invention
based on appended
drawings and embodiments:
Figure 1 is a structural diagram showing the present invention;
Figure 2 is a structural diagram showing the switch in the present invention;
Figure 3 is a structural diagram showing the MOS driver circuit according to
the present
invention; and
Figure 4 is a structural top view showing the first electric contacts and the
second electric
contacts according to the present invention.
Embodiments
As shown in figure 1 and figure 2, a communication channel switching circuit
for vehicle
diagnosis equipment, comprising a plurality of communication channels 110
provided on a
circuit board, wherein each of the plurality of communication channels 110 is
respectively
connected with each of pins of an OBD port by a plurality of switches 120,
through-holes 21
one-to-one corresponding to the plurality of switches are provided on the
circuit board 20, each
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of the plurality of switches 120 comprises a first electric contact 121, a
second electric contact
122, a column 123, and a power 124.
Wherein, the through-holes are mechanical holes, with no up-and-down
electrical
communication.
The first electric contact 121 and the second electric contact 122 are
provided beside a
corresponding through-hole 21 on the circuit board 20, which is shown in
figure 4, the first
electric contact is connected with a corresponding communication channel and
the second
electric contact 122 is connected with a corresponding pin.
The column 123 can move vertically, passes the through-hole 21 and engages
with the through-
hole 21 by sliding, an electric conduction piece 125 is provided on a top
portion of the column
123 which will contact electrically the first electric contact 121 and the
second electric contact
122 when the column 123 is moved downwards, and a flexible self-resuming piece
126 is
provided between the electric conduction piece 125 and the circuit board 20.
The power 124 is used to drive the column 123 to move up and down.
When the column 123 is in an initial position, the electric conduction piece
125 is above the first
electric contact 121 and the second electric contact 122, during use, the
power 124 drives the
column 123 to move downwards from the initial position, and after the column
123 moves for a
certain distance, the electric conduction piece 125 contacts and is in
conduction with both the
first electric contact 121 and the second electric contact 122, so that the
first electric contact
121 contacts the second electric contact 122, and the current communication
channel is in
conduction with the corresponding pin, in the meantime, when the column 123
continues to
move downwards, the flexible self-resuming piece 126 is compressed, so when it
is necessary to
disconnect the current communication channel and the corresponding pin, stop
the power 124,
and the column 123 will resume to the initial position upon action of the
flexible self-resuming
piece 126.
As shown in figure 1, when it is necessary to communicate a CAN_L
communication channel to a
pin 1, actuate a switch corresponding to the through-hole at an upper left
corner in the figure,
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apparently, it is possible to have a plurality of CAN_L communication channels
to be in
conduction with a plurality of pins with a plurality of switches.
In the present invention, it is possible to switch each of the communication
channels of the
vehicle diagnosis equipment accurately to a corresponding pin, and the
communication channel
switching circuit for vehicle diagnosis equipment is suitable for use in
conditions where a
plurality of communication channels work independently, and is characterized
by advantages
such as being of small size, low cost, functioning stably, suitable for use in
external circuits of
high power, and free from signal interference etc.
In the present embodiment, both the first electric contact 121 and the second
electric contact
122 are semi-circular copper sheets, symmetrically provided surrounding the
corresponding
through-hole.
The electric conduction piece 125 comprises a horizontal rod 124a, and both
ends of the rod
124a extend downwards vertically to form contact terminals 124b corresponding
to the first
electric contact 121 and the second electric contact 122.
Wherein, the flexible self-resuming piece 126 can be a spring, sleeved on an
upper end portion
of the column 123.
In the present embodiment, a limiting piece 127 is radially provided on a
lower end of the
column 123, the limiting piece 127 is of a horizontal rod shape, which will
prevent departure of
the column 123 from the circuit board under action of the flexible self-
resuming piece 126 when
moving upwards.
In the present embodiment, the power 124 is an electromagnetic coil L3, which
is provided
radially outside a lower part of the column 123, and fixed to the circuit
board 20,
correspondingly, the column 123 is an insulated column, and the electric
conduction piece 125 is
made of magnetic metal materials. When the electromagnetic coil is enabled,
the
electromagnetic coil will produce electromagnetic absorption force, absorbing
the electric
conduction piece 125 to move the column 123 downwards, and upon moving for a
certain
distance, the contact terminals 124b at both ends contact electrically the
first electric contact
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121 and the second electric contact 122, so that the first electric contact
121 is in conduction
with the second electric contact 122; and when the electromagnetic coil is not
enabled, the
column 123 will resume to the initial position upon action of the flexible
self-resuming piece
126.
Specifically, the electric conduction piece 125 is made of steel, and can also
be made of cobalt,
nickel and other magnetic metal materials.
Wherein, as shown in figure 3, the electromagnetic coil is given enable
control by an MOS driver
circuit, specifically the enable control is done in a following manner: one
end of the
electromagnetic coil L3 is connected with a VCC (Volt Current Condenser) of
the supply, another
end thereof is connected with a collector of an MOS pipe 018, an emitter of
the MOS pipe 018
is grounded, a base of the MOS pipe 018 is grounded via a resistor R51, and
the base accesses
switch signals via a resistor R50, the switch signals come from an MCU main
control circuit of the
vehicle diagnosis equipment, and the resistor R50 and the resistor R51 protect
the MOS driver
circuit.
When the MOS pipe 018 is conducted, the electromagnetic coil is enabled, and
when the MOS
pipe 018 is closed, the electromagnetic coil is disabled.
Preferably, as shown in figure 1, in the present embodiment, the through-holes
21 are
distributed in a matrix, and apparently, the present invention is not limited
to the 5*5 matrix
shown in the drawings.
However, those of ordinary skill in the art shall recognize that, the
foregoing embodiments are
only used to explain rather than limit the present invention, all changes and
variations of the
foregoing embodiments in substantial spirits of the present invention fall
into scope of the
appended claims.
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Representative Drawing