CN207869128U - Multi-protocols onboard diagnostics box with CAN communication bus - Google Patents
Multi-protocols onboard diagnostics box with CAN communication bus Download PDFInfo
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- CN207869128U CN207869128U CN201820130573.XU CN201820130573U CN207869128U CN 207869128 U CN207869128 U CN 207869128U CN 201820130573 U CN201820130573 U CN 201820130573U CN 207869128 U CN207869128 U CN 207869128U
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Abstract
The utility model discloses a kind of multi-protocols onboard diagnostics box with CAN communication bus, including relay control switch module, single line CAN bus module, standard CAN bus, bluetooth module and microcontroller；The relay control switch module is connect with the single line CAN bus module, standard CAN bus and microcontroller respectively；The microcontroller is also connect with the single line CAN bus module, standard CAN bus module；The relay control switch module is used for the conducting to the single line CAN bus module and standard CAN bus module under microcontroller control and selects or cut-off；The microcontroller by any one bus of the single line CAN bus module, standard CAN bus module acquire car data and by the bluetooth module by automobile data transfer to diagnosing host.The communication modes of onboard diagnostics box can be selected by relay control switch module, single line CAN bus module and standard CAN bus, single line CAN bus or standard CAN bus may be selected to carry out communicating acquisition automobile fault data with the OBDII interfaces of automobile, communication mode is relatively diversified.
Description
Technical field
The utility model is related to technical field of automotive electronics more particularly to a kind of multi-protocols with CAN communication bus are vehicle-mounted
Diagnosis box.
Background technology
Automobile fault diagnosis kit mainly by the OBDII interfaces of automobile acquire automobile fault message, and by automobile therefore
Barrier information is sent to host computer, and the fault message for acquiring sum to automobile by the host computer carries out fault diagnosis.
In existing vehicle failure collecting cassette, mainly communicate adopting with the OBDII interfaces of automobile by single CAN bus
Collect automobile fault data, communication mode is relatively single.In addition, data acquisition box is also needed to through wired mode such as serial ports
Data transmission after acquisition is shown to host computer.It needs automobile fault diagnosis kit connecting host computer when use, use
It is relatively inconvenient.
Utility model content
The utility model is intended to solve at least some of the technical problems in related technologies.For this purpose, this reality
It is to propose a kind of multi-protocols onboard diagnostics box with CAN communication bus with a novel purpose.
To achieve the above object, according to the multi-protocols onboard diagnostics box with CAN communication bus of the utility model embodiment,
The multi-protocols onboard diagnostics box with CAN communication bus includes：
Relay control switch module, single line CAN bus module, standard CAN bus, bluetooth module and microcontroller；
The relay control switch module connects with the single line CAN bus module, standard CAN bus and microcontroller respectively
It connects；
The microcontroller is also connect with the single line CAN bus module, standard CAN bus module；
The relay control switch module is used under microcontroller control to the single line CAN bus module and mark
The conducting of quasi- CAN bus module is selected or is cut-off；
The microcontroller acquires automobile number by the single line CAN bus module, any one bus of standard CAN bus module
According to.
According to the utility model one embodiment, the single line CAN bus module includes single line CAN governor circuit and signal
Transmission control circuit；
The single line CAN governor circuit is connect with the signal transmission control circuit, and the signal transmission control circuit is logical
The relay is crossed to connect with the CAN data transmit-receives end of automobile OBDII interfaces；
The single line CAN governor circuit receives and dispatches the microcontroller input/output signal, and is passed by the signal
Defeated control circuit and the CAN data transmit-receives end of automobile OBDII interfaces carry out data transmit-receive；
The signal transmission control circuit controls single line CAN bus data transmit-receive channel under microcontroller control
On or off.
According to the utility model one embodiment, the single line CAN governor circuit includes single line CAN control chip and periphery
Circuit, the peripheral circuit include resistance R69, inductance L4 and capacitance C65；
The resistor loaded end that the one end the resistance R69 controls chip with the single line CAN is connect, and the resistance R69's is another
The one end for the data transmit-receive end CANH and the inductance L4 that one end controls chip with the single line CAN respectively is connect, the electricity
The other end of sense L4 is connect with the signal transmission control circuit, and the one end the capacitance C65 is described another with the inductance L4's
End connection, the other end of the capacitance C65 are connect with reference ground.
According to the utility model one embodiment, the signal transmission control circuit includes that signal conduction module and signal are led
Logical control module；The signal conduction module is connect with the signal conduction control module, and the signal conduction module is also distinguished
It is connect with the relay and the single line CAN governor circuit；The signal conduction control module is also connect with the microcontroller.
According to the utility model one embodiment, the standard CAN bus module further includes standard CAN governor circuit and letter
Number transmission process circuit；The standard CAN governor circuit is connect with the process of signal transmission circuit, the process of signal transmission
Circuit is also connect by relay with the standard CAN data transmit-receive end of automobile OBDII interfaces；
The standard CAN governor circuit receives and dispatches the microcontroller input/output signal, and is passed by the signal
The standard CAN data transmit-receive end of defeated processing circuit and automobile OBDII interfaces carries out data transmit-receive；
Input/output signal of the signal transmission control circuit to the CAN data transmit-receives end of the automobile OBDII interfaces
Carry out signal interference removal processing.
According to the utility model one embodiment, the process of signal transmission circuit includes：Capacitance C105, capacitance C106,
Resistance R134, resistance R135, capacitance C104, resistance R78 and resistance R77；
The one end the capacitance C105 is connect with the ends CANL of the standard CAN governor circuit, the other end of the C105 with
Reference ground connects, and one end of the capacitance C106 is connect with the ends CANH of the standard CAN governor circuit, the capacitance C106's
Other end reference ground connects；
One end of the resistance R78 is connect with the standard CAN data transmit-receive end CANL1 of the automobile OBDII interfaces, described
The other end of resistance R78 is connect with the ends CANL of one end of the resistance R134 and the standard CAN governor circuit respectively, described
The other end of resistance R134 is connect with one end of the capacitance C104, and the other end of the capacitance C104 is connect with reference ground；
One end of the resistance R77 is connect with the ends CANH1 at the CAN data transmit-receives end of the automobile OBDII interfaces, described
The other end of resistance R77 is connect with the ends CANL of one end of the resistance R135 and the standard CAN governor circuit respectively, described
The other end of resistance R135 is connect with one end of the capacitance C104.
Further include OLED power supply circuits, OLED display interface circuits and OLED aobvious according to the utility model one embodiment
Display screen；The microcontroller is connect with the OLED display interface circuits, and the acquisition car data is passed by serial bus
Transport to the OLED display interface circuits, the OLED display interface circuits by the gathered data be transmitted to OLED display screen into
Row display；
The OLED power supply circuits boost input power, and are described by the OLED display interface circuits
OLED display screen provides power supply.
According to the utility model one embodiment, the OLED display interface circuits include connector J3, the first pull-up electricity
Hinder R123, the second pull-up resistor R124, third pull-up resistor R125；
Described one end first pull-up resistor R123, second one end pull-up resistor R124, one end third pull-up resistor R125 point
It is not connect with the first power supply；
The other end of the first resistor R123 is connect with the ends OLED_RST of the connector J3, the second resistance
The other end of R124 is connect with the ends OLED_SCL of the connector J3, the other end and the connection of the 3rd resistor R123
The ends OLED_SDA of device J3 connect.
According to the utility model one embodiment, the OLED power supply circuits are also connect with the microcontroller, the OLED
Power supply circuit cut-offs output power supply under the control of the microcontroller.
According to the utility model one embodiment, the OLED power supply circuits include：Power supply control chip U23, inductance L5,
Diode D8, resistance R128 and resistance R130；
Described inductance one end is connect with input power, the pulse of the inductance other end and the power supply control chip U23
The ends control terminal LX connect；
The anode of the diode D8 is connect with the Pulse Width Control end ends LX of the power supply control chip U23, two pole
The cathode of pipe D8 is connect with one end of the resistance R128, the other end of the resistance R128 and the power supply control chip U23
The ends pressure feedback port FB connection；
One end of the resistance R130 is connect with the ends pressure feedback port FB of the power supply control chip U23, the resistance
The other end of R130 is connect with reference ground.
The utility model embodiment can by relay control switch module, single line CAN bus module and standard CAN bus
The communication modes of onboard diagnostics box are selected, single line CAN bus may be selected or the OBDII of standard CAN bus and automobile connects
Mouth carries out communication acquisition automobile fault data, and communication mode is relatively diversified.Occur in standard CAN bus or single line CAN bus
When failure, other single line CAN bus or standard CAN bus can be selected to acquire car data, it is user-friendly.
Description of the drawings
Fig. 1 is the multi-protocols onboard diagnostics box structural schematic diagram with CAN communication bus that the utility model embodiment provides；
Fig. 2 is the single line CAN master for the multi-protocols onboard diagnostics box with CAN communication bus that the utility model embodiment provides
Control electrical block diagram；
Fig. 3 is the signal transmission for the multi-protocols onboard diagnostics box with CAN communication bus that the utility model embodiment provides
Control circuit structural representation；
Fig. 4 is the standard CAN master for the multi-protocols onboard diagnostics box with CAN communication bus that the utility model embodiment provides
Control electrical block diagram；
Fig. 5 is the signal transmission for the multi-protocols onboard diagnostics box with CAN communication bus that the utility model embodiment provides
Processing circuit structural schematic diagram；
Fig. 6 is the OLED power supplies for the multi-protocols onboard diagnostics box with CAN communication bus that the utility model embodiment provides
Electrical block diagram；
Fig. 7 is that the OLED for the multi-protocols onboard diagnostics box with CAN communication bus that the utility model embodiment provides is shown
Interface circuit structure schematic diagram.
Reference numeral：
Relay control switch module 10；
Single line CAN bus module 20；
Standard CAN bus module 30；
Microcontroller 40；
OLED display screen 50；
Bluetooth module 60；
Diagnose host 70.
The embodiments will be further described with reference to the accompanying drawings for the realization, functional characteristics and advantage of the utility model aim.
Specific implementation mode
In order to make those skilled in the art more fully understand the utility model, below in conjunction with the utility model reality
The attached drawing in example is applied, the technical scheme in the utility model embodiment is clearly and completely described.Unless otherwise defined,
All of technologies and scientific terms used here by the article is generally understood with person skilled in the technical field of the present invention
Meaning it is identical.Terminology used in the description of the utility model herein is intended merely to description specific embodiment
Purpose, it is not intended that in limitation the utility model.
Referenced herein " embodiment " is it is meant that a particular feature, structure, or characteristic described can wrap in conjunction with the embodiments
It is contained at least one embodiment of the utility model., which there is the phrase, in each position in the description to be each meant
Identical embodiment, nor the independent or alternative embodiment with other embodiments mutual exclusion.Those skilled in the art are explicit
Ground and implicitly understand, embodiment described herein can be combined with other embodiments.
Refering to fig. 1, Fig. 1 is the multi-protocols onboard diagnostics box knot with CAN communication bus that the utility model embodiment provides
Structure schematic diagram.
A kind of multi-protocols onboard diagnostics box with CAN communication bus that the utility model embodiment provides, including：Relay
Control switch module 10, single line CAN bus module 20, standard CAN bus module 30, bluetooth module 60 and microcontroller 40；It is described
Relay control switch module 10 connects with the single line CAN bus module 20, standard CAN bus module 30 and microcontroller 40 respectively
It connects；The microcontroller 40 is also connect with the single line CAN bus module 20, standard CAN bus module 30；The relay control
Switch module 10 is used under the control of the microcontroller 40 to the single line CAN bus module 20 and standard CAN bus module 30
Conducting selection or cut-off；The microcontroller 40 is arbitrary by the single line CAN bus module 20, standard CAN bus module 30
One bus acquire car data, and by the bluetooth module 60 by the automobile data transfer to diagnose host 70.
Specifically, since the microcontroller 40 is connect with the relay control switch module 10, the microcontroller 40 can
Control the selection that the relay control switch module 10 carries out communication bus.It may be selected according to the practical application request of user single
Line CAN bus communicate or is communicated using standard CAN bus.To meet the bus communication demand on different automobiles.Institute
State microcontroller and by the bluetooth module 60 by the automobile data transfer to diagnosis host 70.
The utility model embodiment is total by relay control switch module 10, single line CAN bus module 20 and standard CAN
Line can select the communication modes of onboard diagnostics box, and single line CAN bus or standard CAN bus and automobile may be selected
OBDII interfaces carry out communication acquisition automobile fault data, and communication mode is relatively diversified.It is total in standard CAN bus or single line CAN
When line breaks down, other single line CAN bus or standard CAN bus can be selected to acquire car data, facilitate making for user
With.
Further, in the utility model one embodiment, the single line CAN bus module 20 includes single line CAN master
Control circuit and signal transmission control circuit；The single line CAN governor circuit is connect with the signal transmission control circuit, the letter
Number transmission control circuit is connect by the relay with the single line CAN data transmit-receive end of automobile OBDII interfaces；The single line
CAN governor circuits receive and dispatch 40 input/output signal of the microcontroller, and pass through the signal transmission control circuit and vapour
The single line CAN data transmit-receive end of vehicle OBDII interfaces carries out data transmit-receive；The signal transmission control circuit is in the microcontroller 40
The lower on or off for controlling single line CAN bus data transmit-receive channel of control.
In the utility model embodiment, the transmission of single line CAN signal is controlled by the signal transmission control circuit.Institute
State single line CAN bus when not in use, the single line CAN data transmit-receive ends of the automobile OBDII interfaces and the microcontroller 40 it
Between signal influence each other.That is, the single line CAN bus when not in use, the signal transmission control circuit will
Communication port is closed so that the automobile OBDII interfaces occupied described in the single line CAN bus can keep for other buses
It uses.
Refering to Fig. 2 and Fig. 3；Fig. 2 is the multi-protocols onboard diagnostics with CAN communication bus that the utility model embodiment provides
The single line CAN governor circuit structural schematic diagram of box；Fig. 3 is more associations with CAN communication bus that the utility model embodiment provides
Discuss the signal transmission control circuit structural representation of onboard diagnostics box.
Further, in the utility model one embodiment, the single line CAN governor circuit includes single line CAN control
Chip and peripheral circuit；The peripheral circuit includes resistance R69, inductance L4 and capacitance C65；The one end the resistance R69 with it is described
Single line CAN controls the resistor loaded end RTH connections of chip, and the other end of the resistance R69 controls core with the single line CAN respectively
One end of the data transmit-receive end CANH of piece and the inductance L4 connect, the other end and the signal transmission of the inductance L4
Control circuit connects, and the one end the capacitance C65 is connect with the other end of the inductance L4, the other end of the capacitance C65
It is connect with reference ground.
In the utility model embodiment, the single line CAN control chip is NCV7356D1R2G.The utility model is implemented
In example, chip is controlled by single line CAN and peripheral circuit realizes that single line CAN transmission circuit, circuit structure are simple.
Further, in the utility model one embodiment, the signal transmission control circuit includes signal conduction mould
Block and signal conduction control module；The signal conduction module is connect with the signal conduction control module, the signal conduction
Module is also connect with the relay and the single line CAN governor circuit respectively.The signal conduction control module also with it is described
Microcontroller 40 connects；With continued reference to Fig. 3.
Specifically, in one embodiment of the utility model, the signal conduction module includes metal-oxide-semiconductor Q2 and metal-oxide-semiconductor
Q3；The source electrode of the metal-oxide-semiconductor Q2 is connect with the single line CAN data transmit-receive end of the automobile OBDII interfaces, the metal-oxide-semiconductor Q2's
Drain electrode is connect with the drain electrode of the metal-oxide-semiconductor Q3, and the source electrode of the metal-oxide-semiconductor Q3 is connect with the other end of the inductance L4, institute
The grid of the grid, metal-oxide-semiconductor Q3 of stating metal-oxide-semiconductor Q2 is connect with the signal conduction control module respectively.
Optionally, in some other embodiments of the utility model, the metal-oxide-semiconductor Q2 and metal-oxide-semiconductor Q3 can also be used after
Electric appliance or other electronic switches.
Specifically, in one embodiment of the utility model, the signal conduction control module includes triode Q5, electricity
Hinder R59, resistance R61, resistance R66 and resistance R64；The one end the resistance R59 is connect with the source electrode of the metal-oxide-semiconductor Q2, the electricity
The other end of resistance R59 is connect with one end of the resistance R61, the current collection of the other end of the resistance R61 and the triode Q5
Pole connects, and the emitter of the triode Q5 is connect with reference ground, and the base stage of the triode Q5 is respectively with the resistance R66's
One end connection of one end, resistance R64, the other end of the resistance R66 connect with reference ground, the other end of the resistance R64 and
Microcontroller 40 connects.In the utility model embodiment, the triode Q5 is NPN type triode.
In the utility model one embodiment, pass through the triode Q5, resistance R59, resistance R61, resistance R66 and electricity
It hinders R64 and constitutes signal conduction control module, circuit structure is simple, and cost of implementation is low.
Refering to Fig. 4 and Fig. 5；Fig. 4 is the multi-protocols onboard diagnostics with CAN communication bus that the utility model embodiment provides
The standard CAN governor circuit structural schematic diagram of box；Fig. 5 is more associations with CAN communication bus that the utility model embodiment provides
Discuss the process of signal transmission electrical block diagram of onboard diagnostics box.
Further, in the utility model one embodiment, the standard CAN bus module 30 further includes standard CAN
Governor circuit and process of signal transmission circuit；The standard CAN governor circuit is connect with the process of signal transmission circuit, described
Process of signal transmission circuit is also connect by relay with the standard CAN data transmit-receive end of automobile OBDII interfaces；The standard
CAN governor circuits receive and dispatch 40 input/output signal of the microcontroller, and pass through the process of signal transmission circuit and vapour
The standard CAN data transmit-receive end of vehicle OBDII interfaces carries out data transmit-receive.
Input/output signal of the signal transmission control circuit to the CAN data transmit-receives end of the automobile OBDII interfaces
Carry out signal interference removal processing.
Specifically, since the standard CAN uses Double wire transmission, and the standard CAN is differential signal, in differential signal
When passing through automotive interior, may after there is the interference of common-mode signal or surge current occur.In the utility model embodiment
In, by the interference of the common-mode signal or occur surge current by the process of signal transmission circuit and filter out, ensures signal
Reliability is supported hot-swappable.
Further, in the utility model one embodiment, the process of signal transmission circuit includes：Capacitance C105,
Capacitance C106, resistance R134, resistance R135, capacitance C104, resistance R78 and resistance R77；The one end the capacitance C105 and the mark
The ends CANL of quasi- CAN governor circuits connect, and the other end of the C105 is connect with reference ground, one end of the capacitance C106 and institute
State the end (CANH) connection of standard CAN governor circuit, the other end reference ground connection of the capacitance C106；The resistance R78's
One end is connect with the standard CAN data transmit-receive end CANL1 of the automobile OBDII interfaces, the other end of the resistance R78 respectively with
One end of the resistance R134 and the connection of the ends CANL of the standard CAN governor circuit, the other end of the resistance R134 and institute
One end connection of capacitance C104 is stated, the other end of the capacitance C104 is connect with reference ground；One end of the resistance R77 with it is described
The ends CANH1 at the CAN data transmit-receives end of automobile OBDII interfaces connect, the other end of the resistance R77 respectively with the resistance
One end of R135 and the connection of the ends CANL of the standard CAN governor circuit, the other end and the capacitance of the resistance R135
One end of C104 connects.
In the utility model embodiment, by capacitance C105, capacitance C106, resistance R134, resistance R135, capacitance C104,
Resistance R78 and resistance R77 constitute process of signal transmission circuit, and circuit structure is simple, and cost is relatively low, can effectively filter out CAN bus
On interference signal, ensure the reliability of circuit communication.
Refering to Fig. 6 and Fig. 7, Fig. 6 is the multi-protocols onboard diagnostics with CAN communication bus that the utility model embodiment provides
The OLED power supply circuit construction schematic diagrames of box；Fig. 7 is the multi-protocols vehicle with CAN communication bus that the utility model embodiment provides
Carry the OLED display interface circuit structural schematic diagrams of diagnosis box.
Further, further include OLED power supply circuits, OLED display interface circuits in the utility model one embodiment
And OLED display screen 50；The microcontroller 40 is connect with the OLED display interface circuits, and the acquisition car data is led to
It crosses serial bus and is transmitted to the OLED display interface circuits, the gathered data is transmitted to by the OLED display interface circuits
OLED display screen 50 is shown；The OLED power supply circuits boost input power, and are shown and connect by the OLED
Mouth circuit is that the OLED display screen 50 provides power supply.
Specifically, in the utility model embodiment, by the serial bus microcontroller 40 by the data after acquisition
The OLED display interface circuits are sent to, and are shown by the OLED display screen 50, it is user-friendly.It avoids
It needs automobile fault diagnosis kit connecting host computer when use, it is relatively inconvenient.
Further, in the utility model one embodiment, the OLED display interface circuits include connector J3,
One pull-up resistor R123, the second pull-up resistor R124, third pull-up resistor R125；Described one end first pull-up resistor R123,
Two one end pull-up resistor R124, the one end third pull-up resistor R125 are connect with the first power supply+3.3V respectively；The first resistor
The other end of R123 is connect with the ends OLED_RST of the connector J3, the other end and the connection of the second resistance R124
The ends OLED_SCL of device J3 connect, and the other end of the 3rd resistor R123 is connect with the ends OLED_SDA of the connector J3.
Further, in the utility model one embodiment, the OLED power supply circuits also connect with the microcontroller 40
It connects, the OLED power supply circuits cut-off output power supply under the control of the microcontroller 40.
In the utility model embodiment, output is supplied under the control of the microcontroller 40 by the OLED power supply circuits
Power supply is cut-off so that the OLED display screen 50 when standby, by OLED display screen 50 carry out turn off processing.It saves
Power supply.
Further, in the utility model one embodiment, the OLED power supply circuits include：Power supply control chip
U23, inductance L5, diode D8, resistance R128 and resistance R130；Described inductance one end is connect with input second source 5V_VCC,
The inductance other end is connect with the Pulse Width Control end ends LX of the power supply control chip U23；The anode of the diode D8 with
The Pulse Width Control end ends LX of the power supply control chip U23 connect, the cathode of the diode D8 and the one of the resistance R128
End connection, the other end of the resistance R128 are connect with the ends pressure feedback port FB of the power supply control chip U23；The resistance
One end of R130 is connect with the ends pressure feedback port FB of the power supply control chip U23, the other end and ginseng of the resistance R130
It connects with examining.
In the utility model embodiment, by the power supply control chip U23, inductance L5, diode D8, resistance R128 and
Resistance R130 boosts to input power.Stabilized power source is provided for OLED.
It these are only the embodiments of the present invention, be not intended to limit the scope of the claims of the utility model, although with reference to before
Embodiment is stated the utility model is described in detail, it, still can be right for those skilled in the art comes
Technical solution recorded in aforementioned each specific implementation mode is modified, or carries out equivalent replace to which part technical characteristic
It changes.Every equivalent structure done using the utility model specification and accompanying drawing content is directly or indirectly used in other correlations
Technical field, similarly within the utility model patent protection domain.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is contained at least one embodiment or example of the utility model.In the present specification, to the schematic table of above-mentioned term
It states and may not refer to the same embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be
It can be combined in any suitable manner in any one or more embodiments or example.
Although the embodiments of the present invention have been shown and described above, it is to be understood that above-described embodiment is
Illustratively, it should not be understood as limiting the present invention, those skilled in the art are not departing from the utility model
Principle and objective in the case of above-described embodiment can be changed in the scope of the utility model, change, replace and
Modification.
Claims (10)
1. a kind of multi-protocols onboard diagnostics box with CAN communication bus, which is characterized in that more associations with CAN communication bus
Discussing onboard diagnostics box includes：
Relay control switch module, single line CAN bus module, standard CAN bus, bluetooth module and microcontroller；
The relay control switch module is connect with the single line CAN bus module, standard CAN bus and microcontroller respectively；
The microcontroller is also connect with the single line CAN bus module, standard CAN bus module；
The relay control switch module is used under microcontroller control to the single line CAN bus module and standard
The conducting of CAN bus module is selected or is cut-off；
The microcontroller acquires car data by the single line CAN bus module, any one bus of standard CAN bus module,
And by the bluetooth module by the automobile data transfer to diagnosis host.
2. the multi-protocols onboard diagnostics box according to claim 1 with CAN communication bus, which is characterized in that the single line
CAN bus module includes single line CAN governor circuit and signal transmission control circuit；
The single line CAN governor circuit is connect with the signal transmission control circuit, and the signal transmission control circuit passes through institute
Relay is stated to connect with the CAN data transmit-receives end of automobile OBDII interfaces；
The single line CAN governor circuit receives and dispatches the microcontroller input/output signal, and passes through the signal transmission control
The CAN data transmit-receives end of circuit processed and automobile OBDII interfaces carries out data transmit-receive；
The signal transmission control circuit controls leading for single line CAN bus data transmit-receive channel under microcontroller control
Logical or shutdown.
3. the multi-protocols onboard diagnostics box according to claim 2 with CAN communication bus, which is characterized in that the single line
CAN governor circuits include single line CAN control chip and peripheral circuit, the peripheral circuit include resistance R69, inductance L4 and capacitance
C65；
The resistor loaded end that the one end the resistance R69 controls chip with the single line CAN is connect, the other end of the resistance R69
One end of the data transmit-receive end CANH and the inductance L4 that control chip with the single line CAN respectively are connect, the inductance L4
The other end connect with the signal transmission control circuit, the other end of the one end the capacitance C65 and the inductance L4 connect
It connects, the other end of the capacitance C65 is connect with reference ground.
4. the multi-protocols onboard diagnostics box according to claim 2 with CAN communication bus, which is characterized in that the signal
Transmission control circuit includes signal conduction module and signal conduction control module；The signal conduction module and the signal conduction
Control module connects, and the signal conduction module is also connect with the relay and the single line CAN governor circuit respectively；It is described
Signal conduction control module is also connect with the microcontroller.
5. the multi-protocols onboard diagnostics box according to claim 1 with CAN communication bus, which is characterized in that the standard
CAN bus module further includes standard CAN governor circuit and process of signal transmission circuit；The standard CAN governor circuit with it is described
Process of signal transmission circuit connects, and the process of signal transmission circuit also passes through the standard CAN of relay and automobile OBDII interfaces
Data transmit-receive end connects；
The standard CAN governor circuit receives and dispatches the microcontroller input/output signal, and by the signal transmission at
The standard CAN data transmit-receive end for managing circuit and automobile OBDII interfaces carries out data transmit-receive；
The signal transmission control circuit carries out the input/output signal at the CAN data transmit-receives end of the automobile OBDII interfaces
Signal interference removal is handled.
6. the multi-protocols onboard diagnostics box according to claim 5 with CAN communication bus, which is characterized in that the signal
Transmission process circuit includes：Capacitance C105, capacitance C106, resistance R134, resistance R135, capacitance C104, resistance R78 and resistance
R77；
The one end the capacitance C105 is connect with the ends CANL of the standard CAN governor circuit, the other end of the C105 and reference
Ground connects, and one end of the capacitance C106 is connect with the ends CANH of the standard CAN governor circuit, and the capacitance C106's is another
Hold reference ground connection；
One end of the resistance R78 is connect with the standard CAN data transmit-receive end CANL1 of the automobile OBDII interfaces, the resistance
The other end of R78 is connect with the ends CANL of one end of the resistance R134 and the standard CAN governor circuit respectively, the resistance
The other end of R134 is connect with one end of the capacitance C104, and the other end of the capacitance C104 is connect with reference ground；
One end of the resistance R77 is connect with the ends CANH1 at the CAN data transmit-receives end of the automobile OBDII interfaces, the resistance
The other end of R77 is connect with the ends CANL of one end of the resistance R135 and the standard CAN governor circuit respectively, the resistance
The other end of R135 is connect with one end of the capacitance C104.
7. the multi-protocols onboard diagnostics box according to claim 1 with CAN communication bus, which is characterized in that further include
OLED power supply circuits, OLED display interface circuits and OLED display screen；The microcontroller connects with the OLED display interface circuits
It connects, and the acquisition car data is transmitted to the OLED display interface circuits by serial bus, the OLED, which is shown, to be connect
The gathered data is transmitted to OLED display screen and shown by mouth circuit；
The OLED power supply circuits boost input power, and aobvious for the OLED by the OLED display interface circuits
Display screen provides power supply.
8. the multi-protocols onboard diagnostics box according to claim 7 with CAN communication bus, which is characterized in that the OLED
Display interface circuit includes connector J3, the first pull-up resistor R123, the second pull-up resistor R124, third pull-up resistor R125；
Described one end first pull-up resistor R123, second one end pull-up resistor R124, the one end third pull-up resistor R125 respectively with
First power supply connects；
The other end of the first pull-up resistor R123 is connect with the ends OLED_RST of the connector J3, the second pull-up electricity
The other end of resistance R124 is connect with the ends OLED_SCL of the connector J3, the other end of the third pull-up resistor R125 and institute
State the ends the OLED_SDA connection of connector J3.
9. the multi-protocols onboard diagnostics box according to claim 7 with CAN communication bus, which is characterized in that the OLED
Power supply circuit is also connect with the microcontroller, and the OLED power supply circuits are under the control of the microcontroller to exporting power supply
It is cut-off.
10. the multi-protocols onboard diagnostics box according to claim 7 with CAN communication bus, which is characterized in that the OLED
Power supply circuit includes：Power supply control chip U23, inductance L5, diode D8, resistance R128 and resistance R130；
Described inductance one end is connect with input power, the Pulse Width Control of the inductance other end and the power supply control chip U23
Hold the connection of the ends LX；
The anode of the diode D8 is connect with the Pulse Width Control end ends LX of the power supply control chip U23, the diode D8
Cathode connect with one end of the resistance R128, the electricity of the other end of the resistance R128 and the power supply control chip U23
Press the connection of the ends feedback end FB；
One end of the resistance R130 is connect with the ends pressure feedback port FB of the power supply control chip U23, the resistance R130
The other end connect with reference ground.
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| CN201820130573.XU CN207869128U (en) | 2018-01-25 | 2018-01-25 | Multi-protocols onboard diagnostics box with CAN communication bus |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111147341A (en) * | 2020-01-20 | 2020-05-12 | 苏州易泰勒电子科技有限公司 | Communication conversion circuit and communication system for RGV |
| CN112147987A (en) * | 2020-09-30 | 2020-12-29 | 深圳市元征科技股份有限公司 | Vehicle diagnosis method, vehicle diagnosis device and terminal equipment |
-
2018
- 2018-01-25 CN CN201820130573.XU patent/CN207869128U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111147341A (en) * | 2020-01-20 | 2020-05-12 | 苏州易泰勒电子科技有限公司 | Communication conversion circuit and communication system for RGV |
| CN112147987A (en) * | 2020-09-30 | 2020-12-29 | 深圳市元征科技股份有限公司 | Vehicle diagnosis method, vehicle diagnosis device and terminal equipment |
| CN112147987B (en) * | 2020-09-30 | 2022-07-19 | 深圳市元征科技股份有限公司 | Vehicle diagnosis method, vehicle diagnosis device and terminal equipment |
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