CN2919370Y - Hardware protocol converter of fault diagnosis system of electricity-controlled diesel engine - Google Patents
Hardware protocol converter of fault diagnosis system of electricity-controlled diesel engine Download PDFInfo
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- CN2919370Y CN2919370Y CN 200620040241 CN200620040241U CN2919370Y CN 2919370 Y CN2919370 Y CN 2919370Y CN 200620040241 CN200620040241 CN 200620040241 CN 200620040241 U CN200620040241 U CN 200620040241U CN 2919370 Y CN2919370 Y CN 2919370Y
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Abstract
The utility model relates to the design of a hardware protocol converter for an electronically controlled fault diagnosis system. The converting circuit of the protocol converter consists of an electric resistance, an electric capacity, a dynatron, a comparator, a voltage regulation module, a singlechip and a level switch, with one end of the converting circuit connected with an engine controller through a K-line pursuant to the ISO14230 standard communication protocol, and the other connected with a PC computer through a RS 232 standard communication interface. Owing to that the converting circuit of the hardware protocol converter passes through the level switch by means the K-line pursuant to the ISO14230 standard communication protocol, the data is so processed by the singlechip as to be transmitted to the PC computer through the RS 232 standard communication interface, and thereby provides a highly efficient and reliable communication protocol conversion, which works reliably.
Description
One, technical field
The utility model relates to the design of electrically controlled diesel engine failure diagnosis system hardware protocol converter.
Two, technical background
Along with the development of contemporary diesel technology, the electronic controlled diesel product comes out, and obtains increasingly extensive application.There are very large difference in detection and maintenance for electronic controlled diesel and conventional diesel engine.Owing on electronic controlled diesel, increased many electronic apparatus parts, so the detection of electronic controlled diesel needs special fault diagnosis system to realize with maintenance.The form of fault diagnosis system has many kinds, up-to-date a kind of be to adopt engine controller ECU (electronic control unit code: ECU) is installed on motor car engine, fault diagnosis system software is installed in the PC computer, engine controller ECU and PC computer link by car gage order wire and hardware protocol converter respectively, follow ISO 14230 standards between engine controller ECU and the hardware protocol converter and communicate, adopt the RS232 standard communication interface between PC computer and the hardware protocol converter.The PC computer expert crosses hardware protocol converter and communicates with the engine controller ECU of electronic controlled diesel, thereby reads the failure message and the diagnostic data of electronic controlled diesel.This form is succinct, reliable, software upgrading is convenient.Wherein, gordian technique is the hardware protocol converter design.The function of this hardware protocol converter mainly contains two: the one, and be the RS232 standard of Transistor-Transistor Logic level by change-over circuit with the K-line level conversion of car gage OBD agreement (OBD:onboard Diagnostic is with the car fault diagnosis); The 2nd, be to connect with computer with the data processing of car gage OBD agreement by the RS232 standard communication interface, thereby provide a kind of stable, reliably, make things convenient for, method for converting protocol efficiently.
Three, summary of the invention
The utility model adopts by resistance, electric capacity, triode, electronic components such as comparer are formed change-over circuit, then by car gage order wire and level conversion, with the engine failure signal,, finish data processing by the reception and the transmission of level, input PC computer, thus realization is to the detection of engine failure.
The utility model is achieved in that the electrically controlled diesel engine failure diagnosis system hardware protocol converter, change-over circuit one end of protocol converter connects with engine controller by the K-line that meets the ISO14230 standard communication protocol, the other end is imported the first comparer N1 by signal, through level conversion is the level receiving end signal, enter the second comparer N2 then, converting the K-line that meets ISO 14230 standard communication protocols to by triode T1 shaping, is to connect with the PC computer by the RS232 standard communication interface through single-chip microcomputer and level conversion with the data processing of car gage OBD agreement.
Above-mentioned electrically controlled diesel engine failure diagnosis system hardware protocol converter, change-over circuit is by resistance R 1, resistance R 2, resistance R 3, resistance R 4, resistance R 5, resistance R 6, resistance R 7, capacitor C 1, triode T1, comparer N1, comparer N2, Voltage stabilizing module, single-chip microcomputer and level conversion are formed, resistance R 1, resistance R 2 and resistance R 3 series connection ground connection, resistance R 1 and resistance R 4, capacitor C 1, resistance R 6 parallel connections, resistance R 6 and triode T1, second comparer N2 series connection, resistance R 4 and resistance R 5, resistance R 7 parallel connections, the positive pole of the negative pole of the first comparer N1 and the second comparer N2 is in parallel with resistance R 3, the positive pole of the first comparer N1 and resistance R 4, resistance R 5 and resistance R 7 parallel connections, Voltage stabilizing module are in parallel with the first comparer N1 and the second comparer N2 respectively, and the first comparer N1 and the second comparer N2 are in parallel with single-chip microcomputer.
By car gage order wire and level conversion, just can be easily and accurately with the engine failure signal by change-over circuit, receive and send through level, engine failure information is finished data processing by the PC computer, thereby realizes engine failure is detected and maintenance.
Four, description of drawings
Fig. 1 is an electrically controlled diesel engine failure diagnosis system hardware protocol converter synoptic diagram.
Among the figure, 1 is the vehicle diagnosis interface, and 2 is power supply, and 3 is capacitor C 1,4 is the car gage order wire, and 5 is Voltage stabilizing module, and 6 is that resistance R 1,7 is a resistance R 2,8 is that resistance R 3,9 is that resistance R 5,10 is that resistance R 4,11 is the first comparer N1,12 is level conversion, and 13 is the PC computer, and 14 is the PC transmitting terminal, and 15 is the PC receiving end, 16 is the level receiving end, and 17 is single-chip microcomputer, and 18 is the level transmitting terminal, and 19 is resistance R 7,20 is the second comparer N2, and 21 is triode T1, and 22 is resistance R 6.
Five, preferred forms
Preferred forms of the present utility model is provided by following accompanying drawing.
Referring to Fig. 1, the electrically controlled diesel engine failure diagnosis system hardware protocol converter, the interface that is connected with automobile is vehicle diagnosis interface (1), the interface that is connected with computing machine is PC computer (13).The primary voltage of hardware protocol converter is from the motor car engine accumulator, obtains by interface cable, obtains stable operating voltage through Voltage stabilizing module (5).The K-line and engine controller ECU (electronic control unit code: ECU) connect of change-over circuit one end of protocol converter by meeting the ISO14230 standard communication protocol, the other end is imported the first comparer N1 (11) by the data that will meet car gage OBD agreement, be converted to the level receiving end signal through level conversion (12), enter the second comparer N2 (20) then, convert the K-line that meets ISO 14230 standard communication protocols to by triode T1 (21) shaping, process data into and to connect with PC computer (13) by the RS232 standard communication interface through single-chip microcomputer (17) and level conversion (12).Change-over circuit is by resistance R 1 (6), resistance R 2 (7), resistance R 3 (8), resistance R 4 (10), resistance R 5 (9), resistance R 6 (22), resistance R 7 (19), capacitor C 1 (3), triode T1 (21), the first comparer N1 (11), the second comparer N2 (20), Voltage stabilizing module (5), single-chip microcomputer (17) and level conversion (12) are formed.Resistance R 1 (6), resistance R 2 (7) and resistance R 3 (8) series connection ground connection, resistance R 1 (6) and resistance R 4 (10), capacitor C 1 (3), resistance R 6 (22) parallel connections, resistance R 6 (22) and triode T1 (21), the second comparer N2 (20) series connection, resistance R 4 (10) and resistance R 5 (9), resistance R 7 (19) parallel connections, the positive pole of the negative pole of the first comparer N1 (11) and the second comparer N2 (20) is in parallel with resistance R 3 (8), the positive pole of the first comparer N1 (11) and resistance R 4 (10), resistance R 5 (9) and resistance R 7 (19) parallel connections, Voltage stabilizing module (5) is in parallel with the first comparer N1 (11) and the second comparer N2 (20) respectively, the first comparer N1 (11) and the second comparer N2 (20) connect with single-chip microcomputer (17), convert level receiving end (16) and level transmitting terminal (18) to through level conversion (12), connect with the PC transmitting terminal (14) and the PC receiving end (15) of PC computer (13).Change-over circuit with the K_line level conversion (12) of car gage OBD agreement for Transistor-Transistor Logic level receiving end (16) (RXD-TTL) with level transmitting terminal (18) concrete grammar (TXD-TTL) is, receiving function is embodied as the K-line signal by resistance R 4 (10) and resistance R 7 (19) dividing potential drops, enter the first comparer N1 (11) and be converted into the Transistor-Transistor Logic level signal, sending function is embodied as the signal that sends from single-chip microcomputer (17) and passes through level transmitting terminal (18) (TXD-TTL), enters the second comparer N2 (20) and is converted to the output of K-line signal by triode T1 (21) shaping again.Car gage OBD agreement is handled the back by single-chip microcomputer (17) and is transferred to PC computer (13) by RS232.Wherein Transistor-Transistor Logic level receiving end (16) is the PC receiving end (15) that is connected RS232 with PC computer (13) (RXD-TTL), and level transmitting terminal (18) is the PC transmitting terminal (14) that is connected RS232 with PC computer (13) (TXD-TTL).Single-chip microcomputer (17) adopts standard chips.Because the power supply (2) of hardware protocol converter obtains from automobile, and the change-over circuit design can realize the voltage range of automobile power source (2) broad, can satisfy scope from+9V to+32V, therefore can satisfy simultaneously outfit+12V or+requirement of the automobile of 24V battery power.This hardware protocol converter provides a kind of efficient, communication protocol, and protocol conversion reliably to have to declare wrong fault tolerance, and it is very reliable to work.
Claims (2)
1, a kind of electrically controlled diesel engine failure diagnosis system hardware protocol converter, change-over circuit one end that it is characterized in that protocol converter connects with engine controller by the K-line that meets the ISO14230 standard communication protocol, the other end is imported the first comparer N1 by signal, through level conversion is the level receiving end signal, enter the second comparer N2 then, converting the K-line that meets the ISO14230 standard communication protocol to by triode T1 shaping, is to connect with the PC computer by the RS232 standard communication interface through single-chip microcomputer and level conversion with the data processing of car gage OBD agreement.
2, electrically controlled diesel engine failure diagnosis system hardware protocol converter according to claim 1, it is characterized in that change-over circuit is by resistance R 1, resistance R 2, resistance R 3, resistance R 4, resistance R 5, resistance R 6, resistance R 7, capacitor C 1, triode T1, comparer N1, comparer N2, Voltage stabilizing module, single-chip microcomputer and level conversion are formed, resistance R 1, resistance R 2 and resistance R 3 series connection ground connection, resistance R 1 and resistance R 4, capacitor C 1, resistance R 6 parallel connections, resistance R 6 and triode T1, second comparer N2 series connection, resistance R 4 and resistance R 5, resistance R 7 parallel connections, the positive pole of the negative pole of the first comparer N1 and the second comparer N2 is in parallel with resistance R 3, the positive pole of the first comparer N1 and resistance R 4, resistance R 5 and resistance R 7 parallel connections, Voltage stabilizing module are in parallel with the first comparer N1 and the second comparer N2 respectively, and the first comparer N1 and the second comparer N2 are in parallel with single-chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620040241 CN2919370Y (en) | 2006-03-16 | 2006-03-16 | Hardware protocol converter of fault diagnosis system of electricity-controlled diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620040241 CN2919370Y (en) | 2006-03-16 | 2006-03-16 | Hardware protocol converter of fault diagnosis system of electricity-controlled diesel engine |
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| Publication Number | Publication Date |
|---|---|
| CN2919370Y true CN2919370Y (en) | 2007-07-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620040241 Expired - Fee Related CN2919370Y (en) | 2006-03-16 | 2006-03-16 | Hardware protocol converter of fault diagnosis system of electricity-controlled diesel engine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102520666A (en) * | 2011-12-23 | 2012-06-27 | 北京经纬恒润科技有限公司 | Method and system for reprogramming electronic control unit (ECU) |
-
2006
- 2006-03-16 CN CN 200620040241 patent/CN2919370Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102520666A (en) * | 2011-12-23 | 2012-06-27 | 北京经纬恒润科技有限公司 | Method and system for reprogramming electronic control unit (ECU) |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070704 Termination date: 20150316 |
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| EXPY | Termination of patent right or utility model |