CN201757708U - CAN bus engine detecting system - Google Patents
CAN bus engine detecting system Download PDFInfo
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- CN201757708U CN201757708U CN2010202472305U CN201020247230U CN201757708U CN 201757708 U CN201757708 U CN 201757708U CN 2010202472305 U CN2010202472305 U CN 2010202472305U CN 201020247230 U CN201020247230 U CN 201020247230U CN 201757708 U CN201757708 U CN 201757708U
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- engine
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- central processing
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- engine ecu
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Abstract
The utility model relates to a CAN (Controller Area Network) bus engine detecting system, and aims to provide an intelligent CAN bus engine detecting system with simple hardware circuit. The engine detecting system comprises an engine ECU (Electronic Control Unit), a sensor, a central processing unit and a display terminal connected with the central processing unit; the central processing unit is connected with the detected engine ECU; the sensor is connected with the engine ECU through the CAN bus; and the central processing unit is connected with the engine ECU through a level translator. The utility model realizes two-way communication of the engine ECU and the display terminal by adopting the simple level translator, and can be used for failure detection of a CAN bus engine ECU.
Description
Technical field
The utility model relates to the motor car engine field, and in particular, the utility model is a kind of CAN bus engine detection system about electrical.
Background technology
Whether good the running parameter of engine be its operation of reflection important indicator, the parameter of having only mode by additional sensor to read engine traditionally comes engine is detected, and the data that the installation site of additional sensor is read by the engine structure restriction can not truly reflect engine behavior.The failure code of quoting that breaks down engine can not directly reflect, and brings difficulty for engine production and detection.
Patent Office of the People's Republic of China discloses a CN1631698A document on June 29th, 2005, name is called a kind of data acquisition control system based on the CAN bus, this system comprises the primary instrument layer of sensor and actuator, secondary instrument layer and data recording and display layer, the secondary instrument of secondary instrument layer all adopts intelligence instrument, and be equipped with unified CAN communication interface, constitute intelligence instrument CAN node layer, data recording and display layer are data acquisition and key-course, it also all is equipped with the CAN communication interface and constitutes bus configuration/data acquisition/key-course, between bus configuration/data acquisition/key-course and the intelligence instrument CAN node layer and each level inside is by the CAN bus communication, the signal of primary instrument layer converts CAN linear bus data to by intelligent secondary instrument layer, pass to the host computer of bus configuration/data acquisition/key-course, finish data acquisition and control.Total system has strong interference free performance, have unified standard interface and have extensibility, can satisfy the needs of different test occasions, its data acquistion and control system can be passed through the CAN communication interface, be coupled to each other the line data of going forward side by side exchange easily with various automobile mounted and test bed testing equipment.The shortcoming of this system is the hardware circuit more complicated.
Summary of the invention
The utility model provides simple, the intelligentized CAN bus of a kind of hardware circuit engine detection system for solving the problem of the hardware circuit more complicated that exists in the prior art.
The technical scheme that its technical matters that solves the utility model adopts is: the utility model comprises Engine ECU, sensor, central processing unit and the display terminal that links to each other with central processing unit, central processing unit links to each other with tested Engine ECU, sensor links to each other with Engine ECU by the CAN bus, and central processing unit links to each other with Engine ECU by level translator.ECU(Electronic Control Unit in the engine control system, electronic control unit), claim " car running computer " again, it is the same with common micro computer, form by large scale integrated circuits such as microprocessor (CPU), storer (ROM, RAM), input/output interface (I/O), analog to digital converter (A/D) and shaping, drivings; In the inner automatic diagnosis check and analysis system that adds of the ECU of engine, sensor in different positions reflects data during engine operation on the engine by being installed in, and with these information by CAN(Controller Area Network, the controller local area network fieldbus) bus is sent, send the instruction of reading the ECU relevant information at display terminal, send to ECU by central processing unit, ECU sends information corresponding to central processing unit by the CAN bus with engine information at work, and shows in display terminal; Because the operating voltage of Engine ECU is 12V, the operating voltage of central processing unit is 5V, therefore needs level translator to carry out level conversion between central processing unit and ECU.
As preferably, sensor comprises speed probe, water temperature sensor, air inlet pressure sensor, VVT physical location angular transducer, monitoring sensor catches fire.These all are engine sensors commonly used, and failure rate is higher, need carry out fault detect to these sensors.
As preferably, level translator comprises MAX23 module and peripheral circuit.The MAX23 module has the function of two-way level converting, and circuit is simple, reliability is high.
The beneficial effects of the utility model are: adopt simple level translator, realize the both-way communication of Engine ECU and display terminal, can carry out fault detect to CAN bus Engine ECU.
Description of drawings
Fig. 1 is a kind of system chart of the utility model CAN bus engine detection system;
Fig. 2 is the schematic diagram of the level translator of the utility model CAN bus engine detection system.
Among the figure: 1. speed probe, 2. water temperature sensor, 3. air inlet pressure sensor, 4. VVT physical location angular transducer, 5. monitoring sensor, 6. Engine ECU, 7. level translator catch fire, 8. central processing unit, 9. display terminal, 10.CAN bus.
Embodiment
Below by specific embodiment, and in conjunction with the accompanying drawings the technical solution of the utility model is described in further detail.
Embodiment:
A kind of CAN bus engine detection system of present embodiment, referring to Fig. 1, comprise Engine ECU 6 and the speed probe 1, water temperature sensor 2, air inlet pressure sensor 3, the VVT physical location angular transducer 4 that link to each other with Engine ECU 6 by CAN bus 10, monitoring sensor 5 catches fire, Engine ECU 6 also links to each other with central processing unit 8 by level translator 7, and central processing unit 8 links to each other with display terminal 9.Start central processing unit 8 application software, display terminal 9 sends the communication request instruction by central processing unit 8 to Engine ECU 6, " waking " Engine ECU 6 up provides diagnostic result to display terminal 9, after having received effective " waking a up " pattern, Engine ECU 6 is just then waited for " unlatching communication " request message from display terminal 9.
Engine ECU 6 usefulness 10.4K baud rates are come initialization and communication, " waking up " pattern of a CAN bus 10 of display terminal 9 transmission, and this pattern is to begin after the free time of CAN bus 10; Display terminal 9 transmits first position of opening Communications service after the time at first negative edge.
In the time restriction after having begun " waking up " pattern, if Engine ECU 6 does not receive effective " unlatching communication " message, if the mistake of transmission is perhaps arranged, communication request just can not be activated so, and Engine ECU 6 also can not be responded " unlatching communication " and receives the response to communication request, and communication request will attempt sending new " waking a up " pattern and begin diagnostic session.
After receiving effective " unlatching communication " request message, Engine ECU 6 can be responded " unlatching communication " response code, Engine ECU 6 is set up through identification and is communicated by letter with central processing unit 8, the engine signal that Engine ECU 6 is detected sends central processing unit 8 to by CAN bus 10 again, information is translated into numeral with central processing unit 8 or figure shows engine information in real time, directly shows the rotating speed of engine operation at display terminal 9, water temperature, the admission pressure value, VVT physical location angle, the monitoring of catching fire, the engine failure sign indicating number, states such as indicating fault.
The 12V level that level translator 7 becomes engine EUC6 to discern central processing unit 8 instruction 5V level conversion, while changes the 12V signal level of Engine ECU 6 into 5V level that central processing unit 8 can be discerned again, referring to Fig. 2, level translator 7 comprises MAX23 module and peripheral circuit, No. 9 ends of MAX23 module pass through to link to each other with the signal input part of central processing unit 8 after Q1, the shaping of Q2 triode, No. 10 ends of MAX23 module link to each other with the signal output part of central processing unit 8 by resistance R 10, and No. 8 ends of MAX23 module link to each other with Engine ECU 6.
Above embodiment is one of preferred plan of the present utility model, is not that the utility model is done any pro forma restriction, also has other variant and remodeling under the prerequisite that does not exceed the technical scheme that claim puts down in writing.
Claims (3)
1. CAN bus engine detection system, comprise Engine ECU, sensor, central processing unit and the display terminal that links to each other with central processing unit, described central processing unit links to each other with tested Engine ECU, it is characterized in that: described sensor links to each other with Engine ECU by the CAN bus, and central processing unit links to each other with Engine ECU by level translator.
2. a kind of CAN bus engine detection system according to claim 1 is characterized in that: described sensor comprises speed probe, water temperature sensor, air inlet pressure sensor, VVT physical location angular transducer, monitoring sensor catches fire.
3. a kind of CAN bus engine detection system according to claim 1 and 2, it is characterized in that: described level translator comprises MAX23 module and peripheral circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202472305U CN201757708U (en) | 2010-07-05 | 2010-07-05 | CAN bus engine detecting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202472305U CN201757708U (en) | 2010-07-05 | 2010-07-05 | CAN bus engine detecting system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201757708U true CN201757708U (en) | 2011-03-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010202472305U Expired - Lifetime CN201757708U (en) | 2010-07-05 | 2010-07-05 | CAN bus engine detecting system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103471853A (en) * | 2013-09-30 | 2013-12-25 | 中国民用航空飞行学院 | Piston type engine auxiliary detection system and method for obtaining same |
| CN105486513A (en) * | 2016-01-20 | 2016-04-13 | 贵州师范大学 | Automobile engine fault detection device and detection method |
-
2010
- 2010-07-05 CN CN2010202472305U patent/CN201757708U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103471853A (en) * | 2013-09-30 | 2013-12-25 | 中国民用航空飞行学院 | Piston type engine auxiliary detection system and method for obtaining same |
| CN105486513A (en) * | 2016-01-20 | 2016-04-13 | 贵州师范大学 | Automobile engine fault detection device and detection method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110309 |
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| CX01 | Expiry of patent term |