CN106933218A - It is adapted to the multi-protocols diagnostic module and its control method of OBD interfaces - Google Patents
It is adapted to the multi-protocols diagnostic module and its control method of OBD interfaces Download PDFInfo
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- CN106933218A CN106933218A CN201710276326.0A CN201710276326A CN106933218A CN 106933218 A CN106933218 A CN 106933218A CN 201710276326 A CN201710276326 A CN 201710276326A CN 106933218 A CN106933218 A CN 106933218A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B23/00—Testing or monitoring of control systems or parts thereof
- G05B23/02—Electric testing or monitoring
- G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
- G05B23/0208—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterized by the configuration of the monitoring system
- G05B23/0213—Modular or universal configuration of the monitoring system, e.g. monitoring system having modules that may be combined to build monitoring program; monitoring system that can be applied to legacy systems; adaptable monitoring system; using different communication protocols
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/24—Pc safety
- G05B2219/24065—Real time diagnostics
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Abstract
The invention provides the multi-protocols diagnostic module and its control method of a kind of adaptation OBD interfaces, the module includes MCU module, CAN transceiver, level switch module and encryption chip, and the MCU module, CAN transceiver, level switch module and encryption chip are connected respectively and overall package is integrated IC.The present invention is used as main control chip by MCU of the selection with CAN controller function; the module can be with the various OBD standard agreements of automatic adaptation; realize being communicated with the vehicle of CAN OBD interfaces is supported by CAN transceiver; by K/L electrical level transferring chips or circuit 3.3V or 5V signals can be realized with vehicle-mounted level conversion; realize being communicated with the vehicle of K/L line OBD interfaces is supported, in addition, protecting system by encryption chip; simultaneously using the encapsulation of integrated IC forms, module is very easy to use.
Description
Technical field
The present invention relates to automotive electronic technology, and in particular to a kind of multi-protocols diagnostic module of adaptation OBD interfaces and its control
Method processed.
Background technology
OBD is the abbreviation of English On-Board Diagnostic, i.e. " onboard diagnostic system ".This system can be supervised at any time
The operation conditions of engine and the working condition of exhaust gas aftertreatment system are controlled, once find the feelings for being possible to cause discharge exceeded
Condition, can at once send warning.When system breaks down, trouble light (MIL) or inspection engine (Check Engine) are alerted
Lamp is bright, while fault message can be stored in memory by OBD system, can be with failure by the diagnostic instrments and diagnosis interface of standard
The form of code reads relevant information.According to the prompting of DTC, maintenance personal targetedly go to check relevant position, element and
Circuit, can quickly and accurately determine property and the position of failure.
OBD technologies originate from the U.S. of the eighties earliest, and the OBD technologies at initial stage are reminded by appropriate technical approach
Failure or failure that driver occurs.First generation OBD（OBD I）System, due to the OBD of each Main Auto factory of the world
System is different with its engine management system difference, and this causes larger inconvenience to after-sale service maintenance.California, USA
Air resource portion（CARB）Took the lead in importing OBDII while LEV Abgasgesetzs are implemented in 1996.European Union and Japan are 2000
OBD technologies are introduced after year, it is desirable to which all zero-mileage cars and light truck car (less than 2.5 tons) must be provided with EOBD systems.Second generation OBD
With EOBD standard (EOBD of OBD, ISO european version of U.S.'s version of SAE), perfect monitoring category are unified, it is also expressly that tight
The discharge specific aim of lattice.
As shown in figure 1, the OBD interface diagnosises seat of all vehicles of the standards of OBD II requirement is 16PIN, shape, size specification system
One.OBD II has unified each car type same fault code and meaning, with numerical analysis data transmission function, including driving recording
Device, again show memory DTC, the functions such as DTC can be directly removed by instrument, vehicle OBD interfaces are basic in the market
On be all the standard interfaces of OBD II.
In order to preferably obtain OBD diagnostic datas, traditional vehicle-mounted OBD information is all obtained by OBD diagnosis boxes；
The OBD diagnosis boxes of the model ELM27 for such as occurring on the market, it supports many agreements, can read number from OBD with self adaptation
After according to bag, automatically select the agreement of support to parse, then with RS232 serial manners export, RS232 serial ports interface with
ELM327 obtains diagnostic message by interacting, but such OBD diagnosis boxes volume is larger, is unfavorable for secondary development or collection
Into amateur senior to be difficult to directly obtain information of vehicles by OBD while OBD diagnostic techniques has certain technical threshold.
The content of the invention
First by providing a kind of multi-protocols diagnostic module of adaptation OBD interfaces, the module is carried the application by selection
The MCU of CAN transceiver function used as main control chip, by CAN transceiver realized and branch by the various OBD standard agreements of automatic adaptation
The car communication of CAN OBD interfaces is held, 3.3V or 5V signals and vehicle mounted electric can be realized by K/L electrical level transferring chips or circuit
Flat turn is changed, and realizes being communicated with the car of K/L line OBD interfaces is supported, in addition, by encipherment protection and encapsulation, in the way of general purpose I C,
The threshold that OBD technologies are used can be reduced, it is widely applied to the fields such as car networking, Internet of Things.
In order to achieve the above object, the application is achieved using following technical scheme：
A kind of multi-protocols diagnostic module of adaptation OBD interfaces, its it is critical only that including：MCU module, CAN transceiver, level conversion
Module and encryption chip, the MCU module, CAN transceiver, level switch module and encryption chip are connected respectively simultaneously
Overall package is integrated IC.
Further, the MCU module outwards leads to VCC pin, TX pins, RX pins, MODE pins and EN and draws
Pin, wherein：
The VCC pin is used to realize the power supply supply of module；
The TX pins are used to realize that the signal of serial protocol to send；
The RX pins are used to realize that the signal of serial protocol to be received；
The MODE pins are used to realize the switching of mode of operation；
The EN pins are used to receive enable signal, realize the drive control of module.
Further, the MCU module is connected with CAN transceiver, the CAN transceiver outwards lead to CANH pins and
CANL pins, wherein：
CANH pins are used to realize that CAN agreement high level signal is received and dispatched；
CANL pins are used to realize that CAN agreement low level signal is received and dispatched.
Further, the level switch module is connected with the MCU module, and the level switch module outwards leads to K
Wire pin, L wire pins, BAT+ pins and BAT- pins；
The K wire pins are used to realize K wire protocol signal transmissions；
The L wire pins are used to realize L wire protocol signal transmissions；
The BAT+ pins are used to realize that automobile power source positive pole is connected；
The BAT- pins are used to realize that automobile power source negative pole is connected.
Further, the encryption chip is connected with the MCU module, for realizing cryptographic check, the encryption chip to
GND pin is led to outward, the connection for realizing whole modular power source ground wire.
Further, the VCC pin, MODE pins, GND pin, EN pins, CANH pins, CANL pins, BAT+ draw
Pin, BAT- pins, L wire pins, K wire pins, RX pins and TX pins on the integrated IC successively according to 1-12 pin
Sequence is encapsulated successively.
Alternatively, the integrated IC is the square modules of 28mm × 28mm.
Alternatively, it is L9637D that the level switch module uses chip model.
Based on foregoing circuit topological structure, the invention allows for a kind of multi-protocols diagnostic module of adaptation OBD interfaces
Control method, specifically follows the steps below：
Step 1：Upper electricity, system initialization；
Step 2：Detection MCU module enables the driving condition of pin, if enabling pin drive signal effectively, starts Working mould
Formula, otherwise continues cycling through detection into standby mode；
Step 3：After starting mode of operation, the driving condition of MCU module mode signal pin is judged, if mode signal pin has
Effect, then into debugging efforts pattern, return to step 2 repeats；If mode signal pin is invalid, into normal work mould
Formula；
Step 4：Into after normal mode of operation, MCU module verifies AES by the encryption chip, after verifying successfully,
Into step 5；Otherwise, the circulation of return to step 2 is performed；
Step 5：MCU module scans corresponding agreement Auto-matching vehicle successively according to default protocol type, while record
With the time, if matching time-out, return to step 2 is re-executed；Otherwise judge whether agreement matching succeeds into next step；
Step 6：Judge whether agreement matching succeeds, if it fails, then return to step 5 is changed another agreement and matched；
If the match is successful, the instruction that parsing user sends, and diagnostic data is obtained according to the instruction；
Step 7：The diagnostic data for returning is parsed, and draws OBD diagnostic results.
Further, in the MCU module default protocol type include the bits 500kbps of ISO15765 id 11,
ISO15765 id 29 bits 500kbps、ISO15765 id 11 bits 250kbps、ISO15765 id 29 bits
250kbps, ISO14230 fast init 10.4kbps, ISO14230 5 Baud init 10.4kbps and ISO9141
5 Baud init auto Baud。
Compared with prior art, remarkable result of the invention is：
Main control chip is used as by MCU of the selection with CAN controller function, the module can be with the various OBD standards of automatic adaptation
Agreement, realizes being communicated with the vehicle of CAN OBD interfaces is supported, by K/L electrical level transferring chips or electricity by CAN transceiver
Road can realize 3.3V or 5V signals and vehicle-mounted level conversion, realize being communicated with the vehicle of K/L line OBD interfaces is supported, according to difference
Voltage class, different CAN controllers can be encapsulated, in addition, protected to system by encryption chip, while using collection
Into the encapsulation of IC forms, module is very easy to use.
Brief description of the drawings
Fig. 1 is OBD interface model figures；
Fig. 2 is the pin assignments figure of the multi-protocols diagnostic module of adaptation OBD interfaces proposed by the present invention；
Fig. 3 is the inside annexation figure of the multi-protocols diagnostic module of adaptation OBD interfaces proposed by the present invention；
Fig. 4 is control flow chart of the invention.
Specific embodiment
It is right below in conjunction with Figure of description and specific embodiment in order to be better understood from above-mentioned technical proposal
Above-mentioned technical proposal is described in detail.
As shown in Fig. 2-Fig. 3, a kind of multi-protocols diagnostic module of adaptation OBD interfaces, including MCU module, CAN transceiver,
Level switch module and encryption chip, the MCU module, CAN transceiver, level switch module and encryption chip are right respectively
Should connect and overall package is integrated IC.
From figures 2 and 3, it will be seen that in specific implementation process, the MCU module outwards leads to VCC pin, TX and draws
Pin, RX pins, MODE pins and EN pins, wherein：
The VCC pin is used to realize the power supply supply of module；
The TX pins are used to realize that the signal of serial protocol to send；
The RX pins are used to realize that the signal of serial protocol to be received；
The MODE pins are used to realize the switching of mode of operation；
The EN pins are used to receive enable signal, realize the drive control of module.
The MCU module is connected with CAN transceiver, and the CAN transceiver outwards leads to CANH pins and CANL pins, its
In：
CANH pins are used to realize that CAN agreement high level signal is received and dispatched；
CANL pins are used to realize that CAN agreement low level signal is received and dispatched.
The level switch module is connected with the MCU module, and it is L9637D that the level switch module uses chip model,
And outwards lead to K wire pins, L wire pins, BAT+ pins and BAT- pins；
The K wire pins are used to realize K wire protocol signal transmissions；
The L wire pins are used to realize L wire protocol signal transmissions；
The BAT+ pins are used to realize that automobile power source positive pole is connected；
The BAT- pins are used to realize that automobile power source negative pole is connected.
The encryption chip is connected with the MCU module, and for realizing cryptographic check, the encryption chip outwards leads to
GND pin, the connection for realizing whole modular power source ground wire.
By Fig. 2 it can also be seen that the module is encapsulated as after integrated IC being 12 pin square modules, size be 28mm ×
28mm, the VCC pin, MODE pins, GND pin, EN pins, CANH pins, CANL pins, BAT+ pins, BAT- pins,
The pin sequence of L wire pins, K wire pins, RX pins and TX pins successively according to 1-12 on the integrated IC is sealed successively
Dress.
As shown in figure 4, foregoing circuit topological structure is based on, the invention allows for a kind of multi-protocols of adaptation OBD interfaces
The control method of diagnostic module, specifically follows the steps below：
Step 1：Upper electricity, system initialization；
Step 2：Detection MCU module enables the driving condition of pin, is generally provided using EN pins and enables signal, if enable is drawn
Pin drive signal effectively, then starts mode of operation, otherwise continues cycling through detection into standby mode；
Step 3：After starting mode of operation, the driving condition of MCU module mode signal pin is judged, generally carried using MODE pins
Change signal for pattern, if mode signal pin is effectively, into debugging efforts pattern, return to step 2 repeats；If
Mode signal pin is invalid, then into normal mode of operation；
Step 4：Into after normal mode of operation, MCU module verifies AES by the encryption chip, after verifying successfully,
Into step 5；Otherwise, the circulation of return to step 2 is performed；
Step 5：MCU module scans corresponding agreement Auto-matching vehicle successively according to default protocol type, while record
With the time, if matching time-out, return to step 2 is re-executed；Otherwise judge whether agreement matching succeeds into next step；
Step 6：Judge whether agreement matching succeeds, if it fails, then return to step 5 is changed another agreement and matched；
If the match is successful, the instruction that parsing user sends, and diagnostic data is obtained according to the instruction；
Step 7：The diagnostic data for returning is parsed, and draws OBD diagnostic results, during specific implementation, the data for gathering can entered
Row treatment and analysis, are calculated driving behavior, vehicle prediction data etc., such as：Vehicle urgency acceleration and deceleration number of times statistics, Fuel Oil Remaining
Mileage etc..
Further, in the MCU module default protocol type include the bits 500kbps of ISO15765 id 11,
ISO15765 id 29 bits 500kbps、ISO15765 id 11 bits 250kbps、ISO15765 id 29 bits
250kbps, ISO14230 fast init 10.4kbps, ISO14230 5 Baud init 10.4kbps and ISO9141
5 Baud init auto Baud。
The circuit module for providing of the invention is except realizing being communicated with vehicle-mounted CAN bus, K/L lines and system and encryption IC friendships
Mutually protection is outer, while devising the functions such as capacitor filtering, MCU are enabled and mode of operation is selected, can be adapted to multiple standards diagnosis
Agreement simultaneously obtains vehicle diagnosis information by OBD interfaces, is IC chip by integration packaging, using more facilitating, by advance
Configuration multiple standards agreement, when communication connection is set up, is matched by way of scanning one by one with vehicle-mounted agreement, until
With success, encryption chip is pre-set in module, when product is used, by providing the form of SDK kits, realize that encryption is tested
Card, it is ensured that security performance.
It should be pointed out that described above is not limitation of the present invention, the present invention is also not limited to the example above,
Change, modified, addition or replacement that those skilled in the art are made in essential scope of the invention, also should
Belong to protection scope of the present invention.
Claims (10)
1. a kind of multi-protocols diagnostic module of adaptation OBD interfaces, it is characterised in that including：MCU module, CAN transceiver, level turn
Mold changing block and encryption chip, the MCU module, CAN transceiver, level switch module and encryption chip are connected respectively
And overall package is integrated IC.
2. the multi-protocols diagnostic module of adaptation OBD interfaces according to claim 1, it is characterised in that the MCU module to
VCC pin, TX pins, RX pins, MODE pins and EN pins are led to outward, wherein：
The VCC pin is used to realize the power supply supply of module；
The TX pins are used to realize that the signal of serial protocol to send；
The RX pins are used to realize that the signal of serial protocol to be received；
The MODE pins are used to realize the switching of mode of operation；
The EN pins are used to receive enable signal, realize the drive control of module.
3. the multi-protocols diagnostic module of adaptation OBD interfaces according to claim 2, it is characterised in that the MCU module with
CAN transceiver is connected, and the CAN transceiver outwards leads to CANH pins and CANL pins, wherein：
CANH pins are used to realize that CAN agreement high level signal is received and dispatched；
CANL pins are used to realize that CAN agreement low level signal is received and dispatched.
4. the multi-protocols diagnostic module of adaptation OBD interfaces according to claim 3, it is characterised in that the level conversion
Module is connected with the MCU module, and the level switch module outwards leads to K wire pins, L wire pins, BAT+ pins and BAT-
Pin；
The K wire pins are used to realize K wire protocol signal transmissions；
The L wire pins are used to realize L wire protocol signal transmissions；
The BAT+ pins are used to realize that automobile power source positive pole is connected；
The BAT- pins are used to realize that automobile power source negative pole is connected.
5. the multi-protocols diagnostic module of adaptation OBD interfaces according to claim 4, it is characterised in that the encryption chip
It is connected with the MCU module, for realizing cryptographic check, the encryption chip outwards leads to GND pin, for realizing whole mould
The connection of block power ground.
6. the multi-protocols diagnostic module of adaptation OBD interfaces according to claim 5, it is characterised in that the VCC pin,
MODE pins, GND pin, EN pins, CANH pins, CANL pins, BAT+ pins, BAT- pins, L wire pins, K wire pins,
The pin sequence of RX pins and TX pins successively according to 1-12 on the integrated IC is encapsulated successively.
7. the multi-protocols diagnostic module of the adaptation OBD interfaces according to claim 5 or 6, it is characterised in that the integrated IC
It is the square modules of 28mm × 28mm.
8. the multi-protocols diagnostic module of adaptation OBD interfaces according to claim 4, it is characterised in that the level conversion
It is L9637D that module uses chip model.
9. the control method of the multi-protocols diagnostic module of adaptation OBD interfaces as claimed in claim 1, it is characterised in that according to
Lower step is carried out：
Step 1：Upper electricity, system initialization；
Step 2：Detection MCU module enables the driving condition of pin, if enabling pin drive signal effectively, starts Working mould
Formula, otherwise continues cycling through detection into standby mode；
Step 3：After starting mode of operation, the driving condition of MCU module mode signal pin is judged, if mode signal pin has
Effect, then into debugging efforts pattern, return to step 2 repeats；If mode signal pin is invalid, into normal work mould
Formula；
Step 4：Into after normal mode of operation, MCU module verifies AES by the encryption chip, after verifying successfully,
Into step 5；Otherwise, the circulation of return to step 2 is performed；
Step 5：MCU module scans corresponding agreement Auto-matching vehicle successively according to default protocol type, while record
With the time, if matching time-out, return to step 2 is re-executed；Otherwise judge whether agreement matching succeeds into next step；
Step 6：Judge whether agreement matching succeeds, if it fails, then return to step 5 is changed another agreement and matched；
If the match is successful, the instruction that parsing user sends, and diagnostic data is obtained according to the instruction；
Step 7：The diagnostic data for returning is parsed, and draws OBD diagnostic results.
10. the control method of the multi-protocols diagnostic module of adaptation OBD interfaces according to claim 9, it is characterised in that：Institute
Default protocol type includes the bits 500kbps of ISO15765 id 11, the bits of ISO15765 id 29 in stating MCU module
500kbps、ISO15765 id 11 bits 250kbps、ISO15765 id 29 bits 250kbps、ISO14230 fast
Init 10.4kbps, the Baud init auto Baud of ISO14230 5 Baud init 10.4kbps and ISO9141 5.
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| CN108255152A (en) * | 2017-12-26 | 2018-07-06 | 深圳市元征软件开发有限公司 | Vehicular diagnostic method, diagnosis box and computer readable storage medium |
| CN108803580A (en) * | 2018-08-15 | 2018-11-13 | 深圳市元征科技股份有限公司 | A kind of method and relevant device of matching vehicle CAN agreement |
| CN108924170A (en) * | 2018-09-21 | 2018-11-30 | 深圳市领世达科技有限公司 | Vehicle data conversion equipment |
| CN110022241A (en) * | 2018-01-10 | 2019-07-16 | 厦门雅迅网络股份有限公司 | The matching process and computer readable storage medium of onboard diagnostic system agreement |
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| CN111586210A (en) * | 2020-04-22 | 2020-08-25 | 东风商用车有限公司 | Multichannel CAN bus OBD diagnostic protocol conversion device |
| 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 |
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