CN100565230C - CAN bus broken circuit detection circuit and method thereof - Google Patents
CAN bus broken circuit detection circuit and method thereof Download PDFInfo
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- CN100565230C CN100565230C CNB2007100153929A CN200710015392A CN100565230C CN 100565230 C CN100565230 C CN 100565230C CN B2007100153929 A CNB2007100153929 A CN B2007100153929A CN 200710015392 A CN200710015392 A CN 200710015392A CN 100565230 C CN100565230 C CN 100565230C
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Abstract
The invention discloses a kind of CAN bus broken circuit detection circuit and method thereof.It has solved the effective ways that lack the CAN bus broken circuit at present, can not satisfy problems such as practical application needs, and it is simple to have method, easy to use, detects high accuracy for examination.Its structure is: it is arranged between an external node and tested node, this circuit comprises two internodal CANH passage and CANL passages, be equipped with the resistance of two pairs of series connection and the control circuit that switch is formed on each passage, wherein the control circuit I of CANH passage is connected with the RTH end of tested node; The control circuit II of CANL passage is connected with the RTL of tested node end.
Description
Technical field
The present invention relates to the total line detecting method of a kind of CAN, relate in particular to a kind of CAN bus broken circuit detection circuit and method thereof.
Background technology
The ISO-11898-3 agreement has been stipulated the fault-tolerant type of the fault-tolerant CAN bus of low speed, but does not comprise the detection that CANH and CANL open circuit simultaneously, and auto vendor has when using the fault-tolerant CAN bus of low speed and detects the requirement that CANH and CANL open circuit simultaneously.CAN bus node mode by communication frames when communication is difficult to guarantee the completeness that detects, and node can't detect the situation that CANH and CANL open circuit simultaneously during dormancy.
Summary of the invention
Purpose of the present invention is exactly the effective ways that lack the CAN bus broken circuit at present in order to solve, can not satisfy problems such as practical application needs, provide that a kind of to have method simple, easy to use, detect the CAN bus broken circuit detection circuit and the method thereof of high accuracy for examination.
The present invention adopts following technical scheme for achieving the above object:
A kind of CAN bus broken circuit detection circuit, it is arranged between an external node and tested node, this circuit comprises two internodal CANH passage and CANL passages, be equipped with the resistance of two pairs of series connection and the control circuit that switch is formed on each passage, wherein the control circuit I of CANH passage is connected with the RTH end of tested node; The control circuit II of CANL passage is connected with the RTL of tested node end.
Described control circuit I consists of, and it comprises resistance R 1 and the switch S 3 of connecting with it, and switch S 3 one ends are connected with the RTH end of tested node by resistance R 1,3 another termination CANH passages, and switch S 3 also is connected with tested node by the CON3 passage simultaneously; Resistance R 4 one ends are connected with power supply, and the other end is connected with switch S 1, and this other end also is connected with tested node through DEC1 simultaneously, and an end of switch S 1 links to each other with resistance R 4, another termination CANH passage, and switch S 1 also is connected with tested node by the CON1 passage simultaneously.
Described control circuit II consists of, and it comprises resistance R 2 and the switch S 4 of connecting with it, and switch S 4 one ends are connected with the RTL end of tested node by resistance R 2, another termination CANL passage, and switch S 4 also is connected with tested node by the CON4 passage simultaneously; Resistance R 3 one end ground connection, the other end is connected with switch S 2, and this other end also is connected with tested node through DEC2 simultaneously, and one of switch S 2 links to each other with resistance R 3, another termination CANL passage, switch S 2 also is connected with tested node by the CON2 passage simultaneously.
The switch of described switch S 1, S2, S3 and S4 is little with leakage current respectively, and the MOSFET that impedance is big realizes; Described resistance R 3 is selected different intrinsic standoff ratios with R4 according to the requirement of node, and resistance is more than 100K.
A kind of detection method of CAN bus broken circuit detection circuit, its method be,
1) system is in dormant state, CANH level=0V under the normal condition, CANL level=12V;
2) control off resistance R1, the R2 by CON3, CON4 passage is connected with bus;
3) control by CON1, CON2 passage is connected to resistance R 4, R3 in the bus;
4) if the bus of detected node was cut off with being connected of external node: because resistance R 1, the disconnection that is connected of R2 and bus, the CANH of detected node and CANL are in open-collector state, because R4, R3 is connected in the bus, and the level of CANH and CANL is by R4, the level of R3 decides, be respectively CANH=1CANL=0 by DEC1 and the detected bus level of DEC2 in this state, opposite with level under the normal condition, this moment can be judged as CANH and CANL opens circuit;
5) in like manner, if the bus of detected node keeps normal with being connected of external node, according to 4) in situation when controlling and detecting, because the level of external bus can be pulled to normal condition with the level of detected node, so this moment, detected bus level was respectively CANH=0, CANL=1, can be judged as this moment does not have open circuit conditions to take place.
The invention has the beneficial effects as follows: circuit structure is simple, and is easy to use, detects accurately quick.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Wherein, 1. external node, 2. tested node.
Embodiment
The invention will be further described below in conjunction with accompanying drawing and embodiment.
Among Fig. 1, the CAN bus broken circuit detection circuit is arranged on 2 of an external node 1 and tested nodes, this circuit comprises two internodal CANH passage and CANL passages, be equipped with the resistance of two pairs of series connection and the control circuit that switch is formed on each passage, wherein the control circuit I of CANH passage is connected with the RTH end of tested node 2; The control circuit II of CANL passage is connected with the RTL of tested node 2 end.
Control circuit I consists of, and it comprises resistance R 1 and the switch S 3 of connecting with it, and resistance R 1 is connected with the RTH end of tested node, switch S 3 another termination CANH passages, and switch S 3 also is connected with tested node by the CON3 passage simultaneously; Resistance R 4 one ends are connected with power supply, and the other end is connected with switch S 1, should also be connected with tested node through DEC1 by end simultaneously, and this end of switch S 1 then is connected with tested node through the CON1 passage, its another termination CANH passage.
Control circuit II consists of, and it comprises resistance R 2 and the switch S 4 of connecting with it, and resistance R 2 is connected with the RTL end of tested node, switch S 4 another termination CANL passages, and switch S 4 also is connected with tested node by the CON4 passage simultaneously; Resistance R 3 one end ground connection, the other end is connected with switch S 2, should also be connected with tested node through DEC2 by end simultaneously, and this end of switch S 2 then is connected with tested node through the CON2 passage, its another termination CANL passage.
The switch of switch S 1, S2, S3 and S4 is little with leakage current respectively, and the big MOSFET of impedance realizes, in order to avoid the state when influencing bus normal communication and dormancy; Described resistance R 3 is selected different intrinsic standoff ratios with R4 according to the requirement of node, and resistance is more than 100K.
A kind of detection method of CAN bus broken circuit detection circuit, its method be,
1) system is in dormant state, CANH level=0V under the normal condition, CANL level=12V;
2) control off resistance R1, the R2 by CON3, CON4 passage is connected with bus;
3) control by CON1, CON2 passage is connected to resistance R 4, R3 in the bus;
4) if the bus of detected node was cut off with being connected of external node: because resistance R 1, the disconnection that is connected of R2 and bus, the CANH of detected node and CANL are in open-collector state, because R4, R3 is connected in the bus, and the level of CANH and CANL is by R4, the level of R3 decides, be respectively CANH=1CANL=0 by DEC1 and the detected bus level of DEC2 in this state, opposite with level under the normal condition, this moment can be judged as CANH and CANL opens circuit;
5) in like manner, if the bus of detected node keeps normal with being connected of external node, when controlling and detecting according to the situation in 4, because the level of external bus can be pulled to normal condition with the level of detected node, so this moment, detected bus level was respectively CANH=0, CANL=1, can be judged as this moment does not have open circuit conditions to take place.
Claims (3)
1, a kind of CAN bus broken circuit detection circuit, it is arranged between an external node and tested node, and it is characterized in that: this circuit comprises two internodal CANH passage and CANL passages, and wherein the control circuit I of CANH passage is connected with the RTH end of tested node; The control circuit II of CANL passage is connected with the RTL of tested node end; Control circuit I consists of, and it comprises resistance R 1 and the switch S 3 of connecting with it, and switch S 3 one ends are connected with the RTH end of tested node by resistance R 1, another termination CANH passage, and switch S 3 also is connected with tested node by the CON3 passage simultaneously; Resistance R 4 one ends are connected with power supply, and the other end is connected with switch S 1, and this other end also is connected with tested node through DEC1 simultaneously, and an end of switch S 1 links to each other with resistance R 4, another termination CANH passage, and switch S 1 also is connected with tested node by the CON1 passage simultaneously; Control circuit II consists of, and it comprises resistance R 2 and the switch S 4 of connecting with it, and switch S 4 one ends are connected with the RTL end of tested node by resistance R 2, another termination CANL passage, and switch S 4 also is connected with tested node by the CON4 passage simultaneously; Resistance R 3 one end ground connection, the other end is connected with switch S 2, and this other end also is connected with tested node through DEC2 simultaneously, and an end of switch S 2 links to each other with resistance R 3, another termination CANL passage, switch S 2 also is connected with tested node by the CON2 passage simultaneously.
2, CAN bus broken circuit detection circuit according to claim 1 is characterized in that: the switch of described switch S 1, S2, S3 and S4 is little with leakage current respectively, and the MOSFET that impedance is big realizes; Described resistance R 3 is selected different intrinsic standoff ratios with R4 according to the requirement of node, and resistance is more than 100K.
3, the detection method of the described CAN bus broken circuit detection circuit of a kind of claim 1 is characterized in that: its method is,
1) system is in dormant state, CANH level=0V under the normal condition, CANL level=12V;
2) control off resistance R1, the R2 by CON3, CON4 passage is connected with bus;
3) control by CON1, CON2 passage is connected to resistance R 4, R3 in the bus;
4) if the bus of detected node was cut off with being connected of external node: because resistance R 1, the disconnection that is connected of R2 and bus, the CANH of detected node and CANL are in open-collector state, because R4, R3 is connected in the bus, and the level of CANH and CANL is by R4, the level of R3 decides, be respectively CANH=1 CANL=0 by DEC1 and the detected bus level of DEC2 in this state, opposite with level under the normal condition, this moment is judged as CANH and CANL opens circuit;
5) in like manner, if the bus of detected node keeps normal with being connected of external node, according to 4) in situation when controlling and detecting, because the level of external bus can be pulled to normal condition with the level of detected node, so this moment, detected bus level was respectively CANH=0, CANL=1, being judged as this moment does not have open circuit conditions to take place.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100153929A CN100565230C (en) | 2007-07-20 | 2007-07-20 | CAN bus broken circuit detection circuit and method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100153929A CN100565230C (en) | 2007-07-20 | 2007-07-20 | CAN bus broken circuit detection circuit and method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101101316A CN101101316A (en) | 2008-01-09 |
| CN100565230C true CN100565230C (en) | 2009-12-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2007100153929A Expired - Fee Related CN100565230C (en) | 2007-07-20 | 2007-07-20 | CAN bus broken circuit detection circuit and method thereof |
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| CN (1) | CN100565230C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106154167A (en) * | 2015-05-15 | 2016-11-23 | 硕天科技股份有限公司 | Battery sensor with addressing mode and detecting mode |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101598758B (en) * | 2009-07-03 | 2011-06-29 | 清华大学 | Method used for detecting open circuit of wires with invariable wiring harness in automobile intelligent electronic system |
| US9568533B2 (en) * | 2014-05-27 | 2017-02-14 | GM Global Technology Operations LLC | Method and apparatus for open-wire fault detection and diagnosis in a controller area network |
| US9678847B2 (en) * | 2014-05-27 | 2017-06-13 | GM Global Technology Operations LLC | Method and apparatus for short fault detection in a controller area network |
| CN108064346A (en) * | 2017-01-19 | 2018-05-22 | 深圳欣锐科技股份有限公司 | A kind of CAN signal line shorted to earth test device |
| CN109799418A (en) * | 2017-11-17 | 2019-05-24 | 厦门雅迅网络股份有限公司 | A method of the connector connection status in detection automobile T-BOX |
| CN109656234A (en) * | 2018-12-29 | 2019-04-19 | 上海联影医疗科技有限公司 | Bus type monitoring system and its control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1052760A2 (en) * | 1999-05-14 | 2000-11-15 | Volkswagen Aktiengesellschaft | CAN bus-system with automatic switch-off of parts of the network in case of faults |
| DE10133441C2 (en) * | 2001-07-10 | 2003-10-30 | Knorr Bremse Systeme | Circuit arrangement for voltage balancing of data buses |
| CN201072433Y (en) * | 2007-07-20 | 2008-06-11 | 山东省科学院自动化研究所 | CAN bus open circuit detection circuit |
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2007
- 2007-07-20 CN CNB2007100153929A patent/CN100565230C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1052760A2 (en) * | 1999-05-14 | 2000-11-15 | Volkswagen Aktiengesellschaft | CAN bus-system with automatic switch-off of parts of the network in case of faults |
| DE10133441C2 (en) * | 2001-07-10 | 2003-10-30 | Knorr Bremse Systeme | Circuit arrangement for voltage balancing of data buses |
| CN201072433Y (en) * | 2007-07-20 | 2008-06-11 | 山东省科学院自动化研究所 | CAN bus open circuit detection circuit |
Non-Patent Citations (2)
| Title |
|---|
| CAN总线原理和应用系统设计. 邬宽明,165-166,北京航空航天大学出版社. 1996 |
| CAN总线原理和应用系统设计. 邬宽明，165-166，北京航空航天大学出版社. 1996 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106154167A (en) * | 2015-05-15 | 2016-11-23 | 硕天科技股份有限公司 | Battery sensor with addressing mode and detecting mode |
| CN106154167B (en) * | 2015-05-15 | 2018-11-02 | 硕天科技股份有限公司 | Battery sensor with addressing mode and detecting mode |
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| Publication number | Publication date |
|---|---|
| CN101101316A (en) | 2008-01-09 |
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Granted publication date: 20091202 Termination date: 20190720 |