CN102393731A - On-board monitoring and diagnosis device based on OBD-II (On-Board Diagnostics-II) - Google Patents
On-board monitoring and diagnosis device based on OBD-II (On-Board Diagnostics-II) Download PDFInfo
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- CN102393731A CN102393731A CN2011103147447A CN201110314744A CN102393731A CN 102393731 A CN102393731 A CN 102393731A CN 2011103147447 A CN2011103147447 A CN 2011103147447A CN 201110314744 A CN201110314744 A CN 201110314744A CN 102393731 A CN102393731 A CN 102393731A
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Abstract
The invention provides an on-board monitoring and diagnosis device based on OBD-II (On-Board Diagnostics-II), which is applicable to an on-board diagnostic protocol (KWP (Keyword Protocol) 2000). The on-board monitoring and diagnosis device comprises a USB (Universal Serial Bus) serial port module, a serial-to-K-line module and an OBD-II connecting line, whererin, the USB serial port module comprises a USB-serial UART (Universal Asynchronous Receiver/Transmitter) interface chip FT232R, and the serial-to-K-line module comprises a single-ended bus transceiver. The on-board monitoring and diagnosis device based on the OBD-II provided by the invention has the advantages of small volume, high conversion rate, plug and play function, protability and strong operability, and can be fully controlled by a host.
Description
Technical field
The present invention relates to a kind of vehicle-mounted monitoring diagnostic device, relate in particular to vehicle-mounted monitoring diagnostic device based on OBD-II.
Background technology
Along with the develop rapidly of electronic technology and control technology, automobile failure diagnosis has developed into and has used special-purpose monitoring and diagnosis device to carry out.Present automobile online system failure diagnosis can be carried out continuous monitoring and fault self-diagnosis to the vehicle electrically controlling system parameter, and this system can write down the intermittent fault of electric-control system, and it is convenient in time to search fault.The widely used a kind of OBD consensus standard in European car field is KWP2000 (Keyword Protocol 2000), and this agreement has realized the complete OBD service of a cover, and satisfies E-OBD (European On Board Diagnose) standard.E-OBD is called for short OBD (On-Board Diagnostics), i.e. " OBD technology " or abbreviation " OBD ".California, USA takes the lead in having proposed to utilize the requirement of OBD technology to emission control system implementation malfunction monitoring in the form with legislation in 1994, is called OBD-II.OBD-II standard specified in more detail the employed communication protocol of automobile online system failure diagnosis; Stipulated when outer diagnostic device of car and Che Nei electronic control unit communicate the standard that will follow, when also having stipulated automobile generation corresponding failure the failure code that should produce and the method for obtaining these failure codes.OBD-II automobile online system failure diagnosis standard is adopted by most in the world automobile production producers.
Automobile mounted failure monitoring diagnostic platform is the outer diagnostic device of car that cooperates the OBD-II online system failure diagnosis to use.It is set up communication through electronic control unit in automobile OBD-II diagnostics interface and the car and is connected; Communication pattern and Che Nei electronic control unit with regulation engage in the dialogue; Obtain automobile failure diagnosis code and real-time status data; Carry out analyzing and processing and obtain fault diagnosis result, and the result is stored and demonstration in real time.The OBD-II interface unit of vehicle mounted failure monitoring and diagnosis platform is the bridge that vehicle mounted failure monitoring and diagnosis unit and Che Nei electronic control unit communicate.But vehicle failure monitoring and diagnosis device volume is bigger at present, can not promptly insert and promptly pull out, and can not receive the control fully of main frame.
Summary of the invention
Deficiency to prior art; The object of the invention is to provide that a kind of volume is little, conversion ratio is high, plug and play, be easy to carry, workable, can receive that main frame is controlled fully and the vehicle-mounted monitoring diagnostic device based on OBD-II of the vehicle-mounted OBD interface data transmission that is applicable to different manufacturers of secondary development easily.
For solving the problems of the technologies described above, technical scheme of the present invention is achieved in that the vehicle-mounted monitoring diagnostic device based on OBD-II, is suitable for OBD agreement (KWP2000 agreement), and said diagnostic device comprises:
USB serial port module: comprise USB serial UART interface chip FT232R; One signal to be converted is input to the input end of said USB serial port module; The output terminal of said USB serial port module is exported a pair of differential signal, this module by first supply voltage be+5V is its power supply;
Serial ports changes the KLINE module: comprise a single-ended bus transceiver, this module receives said differential signal, and exports an OBD signal at its output terminal, and this module is its power supply by first supply voltage+5V and second supply voltage+12V;
OBD-II connecting line: comprise one 9 pin ports and one 16 pin ports; Described 9 pin ports are connected with the output terminal that serial ports changes KLINE module 20; Described 16 pin ports link to each other with vehicle-mounted OBD interface, and wherein, described OBD signal and OBD-II connecting line 9 pin ports are complementary.
As further improvement of the present invention, said single-ended bus transceiver is chip SI9241AEY.
As further improvement of the present invention, said first supply voltage is provided by computer, and said second supply voltage is provided by on-vehicle battery.
As further improvement of the present invention, the output terminal that said serial ports changes the KLINE module is a two-way interface.
As further improvement of the present invention, the output terminal that said serial ports changes the KLINE module is connected with a slow transients voltage-suppressing circuit.
As further improvement of the present invention, said slow transients voltage-suppressing circuit is to be made up of two diodes.
As further improvement of the present invention, the input end that said serial ports changes the KLINE module is connected with an impedance matching circuit.
As further improvement of the present invention, said impedance matching circuit is to connect a filter capacitor after being connected in parallel by four resistance to constitute.
As further improvement of the present invention, said serial ports changes the KLINE module and comprises the end R1 that interrupts reporting an error, and when the KLINE signal is made mistakes, reports an error through R1, for host computer provides error message.。
As further improvement of the present invention, said interruption reports an error and holds R1 to be connected with a pull-up resistor.
Compared with prior art; The invention has the beneficial effects as follows: the vehicle-mounted monitoring diagnostic device based on OBD-II provided by the invention has that volume is little, conversion ratio is high, plug and play, be easy to carry, workable advantage, and can receive that main frame is controlled fully and secondary development easily.
Description of drawings
Fig. 1 representes in the embodiment of the present invention vehicle-mounted monitoring diagnostic device principle of work module diagram based on OBD-II;
Fig. 2 representes serial port module circuit theory diagrams in the embodiment of the present invention;
Fig. 3 representes that serial ports changes KLINE modular circuit schematic diagram in the embodiment of the present invention;
Fig. 4 representes OBD-II connecting line synoptic diagram in the embodiment of the present invention.
Embodiment
Below will combine accompanying drawing that a preferred implementation of the present invention is at large described.
Please with reference to Fig. 1, Fig. 2 and Fig. 3, in this embodiment, the vehicle-mounted monitoring diagnostic device based on OBD-II provided by the present invention comprises that USB serial port module 10, serial ports change KLINE module 20 and OBD-II connecting line 30.First supply voltage+5V that said USB serial port module 10 connects a direct current supplies power in order to give this module; Said first supply voltage+5V voltage is provided by PC (computer); The signal to be converted of one external USB transmission is input to the input end of said USB serial port module 10; Said serial ports changes KLINE module 20 and connects second supply voltage+12V that first supply voltage+5V that PC (computer) provide and an on-vehicle battery provide with to this module for power supply; The input end that said serial ports changes KLINE module 20 is connected with the output terminal of USB serial port module 10; The output terminal that serial ports changes KLINE module 20 is connected with OBD-II data line 30 1 ends, and an other end of said OBD-II data line 30 is connected with vehicle-mounted OBD interface and carries out communication.
Please with reference to Fig. 1, in this embodiment, said USB serial port module 10 comprises a USB serial UART interface chip U1, a single channel transient voltage suppressor U4 and a USB interface J3.Preferably, in this embodiment, U1 is USB serial UART interface chip FT232R, and U4 is single channel transient voltage suppressor chip SN65220.The output terminal of said USB serial port module is exported a pair of differential signal USB DM and USB DP; 4 pin of described single channel transient voltage suppressor U4 are connected with 16 pin of USB serial UART interface chip U1 and 2 pin of USB interface J3 respectively, in order to the differential signal USB DM of transmission USB; 6 pin of described single channel transient voltage suppressor U4 are connected with 15 pin of USB serial UART interface chip U1 and 3 pin of USB interface J3 respectively, in order to the differential signal USB DP of transmission USB.
4 pin of described USB serial UART interface chip U1 are connected with DC voltage+5V that a PC provides with 20 pin, and U1 is supplied power, and this part also comprises a filter capacitor C1; 7 pin of said U1,21 pin, 25 pin and the whole ground connection of 26 pin; The output of the 1 pin TXD asynchronous transfer of data of said U1,5 pin RXD are the inputs that receive asynchronous data; The 6 pin RI# of said U1 interrupt corresponding input, and when the interruption in the described serial ports commentaries on classics KLINE module reported an error end R1 interrupt response, through RI#, host computer can receive the information that reports an error of interrupting, monitoring ruuning situation.
Please with reference to Fig. 2, in this embodiment, said serial ports changes KLINE module 20 and comprises a single-ended bus transceiver U2, and it is chip SI9241AEY.The 1 pin VDD of described single-ended bus transceiver U2 connects DC voltage+5V that PC provides, and 7 pin VBAT connect the vehicle-mounted DC voltage+12V that provides; The 2 pin TX of said U2 link to each other with 1 pin of USB serial port module, and the 8 pin TX of said U2 link to each other with 5 pin of USB serial port module, thereby realize the transmission of data; The 6 pin K of said U2 are bidirectional interfaces, the input signal that it is used to export an OBD signal or receives vehicle-mounted OBD interface, and wherein, described OBD signal is complementary with OBD-II connecting line interface.The 6 pin K of said U2 are connected with a slow transients voltage-suppressing circuit, and the 7 pin VABT of said U2 are connected with an impedance matching circuit, change the effect of KLINE module 20 to play the coupling serial ports.Wherein, in this embodiment, said slow transients voltage-suppressing circuit is made up of two diodes, and said impedance matching circuit is to connect a filter capacitor after being connected in parallel by four resistance R 3, R4, R5, R6 to constitute.The 4 pin FAULT of said U2 are out the leakage output interface, are connected with 6 pin RI# of USB serial communication modular 10, and connect pull-up resistor R2.
Please with reference to Fig. 3, in this embodiment, described OBD-II connecting line 30 comprises one 9 pin ports and one 16 pin ports, and described 9 pin ports link to each other with the output terminal that serial ports changes KLINE module 20, and described 16 pin ports link to each other with vehicle-mounted OBD interface.Need to prove that the realization of this vehicle-mounted monitoring diagnostic device needs vehicle mounting OBD system to cooperate completion, its design, manufacturing and installation should be able to guarantee that vehicle discerns types of degradation and fault type in the whole lifetime.
Compared with prior art, the vehicle-mounted monitoring diagnostic device based on OBD-II of the present invention, have that volume is little, conversion ratio is high, plug and play, be easy to carry, workable advantage, and can receive that main frame is controlled fully and secondary development easily.
Although be the example purpose; Preferred implementation of the present invention is disclosed; But those of ordinary skill in the art will recognize, under the situation that does not break away from disclosed scope of the present invention and spirit by appending claims, various improvement, increase and replacement are possible.
Claims (10)
1. based on the vehicle-mounted monitoring diagnostic device of OBD-II, be suitable for OBD agreement (KWP2000 agreement), it is characterized in that said diagnostic device comprises:
USB serial port module: comprise USB serial UART interface chip FT232R; One signal to be converted is input to the input end of said USB serial port module; The output terminal of said USB serial port module is exported a pair of differential signal, this module by first supply voltage be+5V is its power supply;
Serial ports changes the KLINE module: comprise a single-ended bus transceiver, this module receives said differential signal, and exports an OBD signal at its output terminal, and this module is its power supply by first supply voltage+5V and second supply voltage+12V;
OBD-II connecting line: comprise one 9 pin ports and one 16 pin ports; Described 9 pin ports are connected with the output terminal that serial ports changes KLINE module 20; Described 16 pin ports link to each other with vehicle-mounted OBD interface, and wherein, described OBD signal and OBD-II connecting line 9 pin ports are complementary.
2. the vehicle-mounted monitoring diagnostic device based on OBD-II as claimed in claim 1 is characterized in that said single-ended bus transceiver is chip SI9241AEY.
3. the vehicle-mounted monitoring diagnostic device based on OBD-II as claimed in claim 1 is characterized in that said first supply voltage is provided by computer, and said second supply voltage is provided by on-vehicle battery.
4. the vehicle-mounted monitoring diagnostic device based on OBD-II as claimed in claim 1 is characterized in that, the output terminal that said serial ports changes the KLINE module is a two-way interface.
5. the vehicle-mounted monitoring diagnostic device based on OBD-II as claimed in claim 4 is characterized in that, the output terminal that said serial ports changes the KLINE module is connected with a slow transients voltage-suppressing circuit.
6. the vehicle-mounted monitoring diagnostic device based on OBD-II as claimed in claim 5 is characterized in that, said slow transients voltage-suppressing circuit is to be made up of two diodes.
7. the vehicle-mounted monitoring diagnostic device based on OBD-II as claimed in claim 4 is characterized in that, the input end that said serial ports changes the KLINE module is connected with an impedance matching circuit.
8. the vehicle-mounted monitoring diagnostic device based on OBD-II as claimed in claim 7 is characterized in that, said impedance matching circuit is to connect a filter capacitor after being connected in parallel by four resistance to constitute.
9. the vehicle-mounted monitoring diagnostic device based on OBD-II as claimed in claim 1 is characterized in that, said serial ports changes the KLINE module and comprises the end R1 that interrupts reporting an error, and when the KLINE signal is made mistakes, reports an error through R1, for host computer provides error message.
10. the vehicle-mounted monitoring diagnostic device based on OBD-II as claimed in claim 9 is characterized in that, said interruption reports an error and holds R1 to be connected with a pull-up resistor.
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| CN2011103147447A CN102393731A (en) | 2011-10-17 | 2011-10-17 | On-board monitoring and diagnosis device based on OBD-II (On-Board Diagnostics-II) |
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| CN2011103147447A CN102393731A (en) | 2011-10-17 | 2011-10-17 | On-board monitoring and diagnosis device based on OBD-II (On-Board Diagnostics-II) |
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Cited By (11)
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| CN102621979A (en) * | 2012-04-09 | 2012-08-01 | 天津一汽夏利汽车股份有限公司 | Data acquisition and fault diagnosis terminal for vehicle |
| CN104111710A (en) * | 2014-07-21 | 2014-10-22 | 无锡隆盛科技股份有限公司 | USB (universal serial bus)-LIN (local interconnect network) switching equipment |
| CN104238499A (en) * | 2014-08-15 | 2014-12-24 | 杭州电子科技大学 | AGV concentrated coordinator based on Internet of Things |
| CN104901407A (en) * | 2015-05-28 | 2015-09-09 | 东风商用车有限公司 | Power source management circuit of commercial vehicle diagnostic protocol adapter |
| CN106708012A (en) * | 2016-12-05 | 2017-05-24 | 深圳市元征科技股份有限公司 | Secondary development method and device for diagnostic device |
| CN108255160A (en) * | 2018-03-12 | 2018-07-06 | 深圳市博诺技术有限公司 | The automobile bus communication wire selection system and method for a kind of 38PIN interfaces |
| CN109901558A (en) * | 2019-03-29 | 2019-06-18 | 南京汽车集团有限公司 | A kind of commercial vehicle intelligence engineering diagnostic equipment and its application method |
| CN109934358A (en) * | 2019-01-30 | 2019-06-25 | 中国人民解放军32181部队 | Equipment failure prediction and health evaluating method, system and terminal device |
| CN111396206A (en) * | 2020-03-30 | 2020-07-10 | 潍柴动力股份有限公司 | Signal calibration method and device and engine electronic controller |
| CN112104230A (en) * | 2020-08-10 | 2020-12-18 | 广州亚美智造科技有限公司 | Vehicle-mounted voltage reduction device and vehicle-mounted system |
| CN113176743A (en) * | 2021-03-25 | 2021-07-27 | 四川百纳科技有限责任公司 | CAN network physical layer diagnosis resistance self-adaptive circuit and method |
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| CN102621979A (en) * | 2012-04-09 | 2012-08-01 | 天津一汽夏利汽车股份有限公司 | Data acquisition and fault diagnosis terminal for vehicle |
| CN104111710A (en) * | 2014-07-21 | 2014-10-22 | 无锡隆盛科技股份有限公司 | USB (universal serial bus)-LIN (local interconnect network) switching equipment |
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| CN106708012A (en) * | 2016-12-05 | 2017-05-24 | 深圳市元征科技股份有限公司 | Secondary development method and device for diagnostic device |
| CN108255160B (en) * | 2018-03-12 | 2023-09-08 | 深圳市博诺技术有限公司 | 38PIN interface automobile bus communication line selection system and method |
| CN108255160A (en) * | 2018-03-12 | 2018-07-06 | 深圳市博诺技术有限公司 | The automobile bus communication wire selection system and method for a kind of 38PIN interfaces |
| CN109934358A (en) * | 2019-01-30 | 2019-06-25 | 中国人民解放军32181部队 | Equipment failure prediction and health evaluating method, system and terminal device |
| CN109901558A (en) * | 2019-03-29 | 2019-06-18 | 南京汽车集团有限公司 | A kind of commercial vehicle intelligence engineering diagnostic equipment and its application method |
| CN111396206B (en) * | 2020-03-30 | 2023-05-23 | 潍柴动力股份有限公司 | Signal calibration method and device and electronic engine controller |
| CN111396206A (en) * | 2020-03-30 | 2020-07-10 | 潍柴动力股份有限公司 | Signal calibration method and device and engine electronic controller |
| CN112104230A (en) * | 2020-08-10 | 2020-12-18 | 广州亚美智造科技有限公司 | Vehicle-mounted voltage reduction device and vehicle-mounted system |
| CN112104230B (en) * | 2020-08-10 | 2021-08-24 | 广州亚美智造科技有限公司 | Vehicle-mounted voltage reduction device and vehicle-mounted system |
| CN113176743A (en) * | 2021-03-25 | 2021-07-27 | 四川百纳科技有限责任公司 | CAN network physical layer diagnosis resistance self-adaptive circuit and method |
| CN113176743B (en) * | 2021-03-25 | 2022-11-15 | 四川百纳科技有限责任公司 | CAN network physical layer diagnosis resistance self-adaptive circuit and method |
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Application publication date: 20120328 |