CN104569717A - Method for on-line monitoring of grounding short circuit by CAN bus - Google Patents

Method for on-line monitoring of grounding short circuit by CAN bus Download PDF

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Publication number
CN104569717A
CN104569717A CN201410812547.1A CN201410812547A CN104569717A CN 104569717 A CN104569717 A CN 104569717A CN 201410812547 A CN201410812547 A CN 201410812547A CN 104569717 A CN104569717 A CN 104569717A
Authority
CN
China
Prior art keywords
bus
short circuit
network
resistance
line monitoring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201410812547.1A
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Chinese (zh)
Inventor
袁建州
李志鹏
于丽娜
付攀
任志国
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhengzhou Nissan Automobile Co Ltd
Original Assignee
Zhengzhou Nissan Automobile Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zhengzhou Nissan Automobile Co Ltd filed Critical Zhengzhou Nissan Automobile Co Ltd
Priority to CN201410812547.1A priority Critical patent/CN104569717A/en
Publication of CN104569717A publication Critical patent/CN104569717A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a method for on-line monitoring of grounding short circuit by a CAN (Controller Area Network) bus. The method comprises the following steps: step one, respectively cascading a resistor of which the resistance value is less than 3 ohms into a high-order data cable CAN_H and a low-order data cable CAN_L of a CAN bus network; step two, detecting voltages at the two ends of each of the two resistors, amplifying the two detected voltage values through an amplifier, and conducting A/D conversion on the two detected voltage values; step three, respectively calculating the current values flowing through the two resistors; steps four, when the absolute values of the two current values calculated in the step three are not equal, determining that the CAN bus network has short circuit faults. The method has the advantages that monitoring of the circuit is simple and practical, influence on the CAN bus network is less, real-time monitoring can be realized, and potential failures can be discovered in the first time.

Description

CAN shorted to earth on-line monitoring method
Technical field
The present invention relates to CAN, especially relate to CAN shorted to earth on-line monitoring method.
Background technology
At automobile industry CAN (CAN:Controller Area Network; The abbreviation of controller local area network) communication in, CAN is responsible for transmission of information stream between ECU (vehicle-mounted electronic control unit).To cause when CAN breaks down shutting down the accidents such as even car crash.In CAN network generation communication failure, the probability of wire harness generation problem is comparatively large, CAN mainly occurs in wiring and overlaps other conductors, such as over the ground or the short circuit of power supply, causes waveform distortion, communicating interrupt time serious.Therefore, so fast finding, locate and fix a breakdown extremely important.
Summary of the invention
The object of the invention is to provide a kind of water temperature regulater for sanitary equipment.
For achieving the above object, the present invention takes following technical proposals:
CAN shorted to earth on-line monitoring method of the present invention, carries out according to following step:
The first step, the resistance that a series connection resistance value is less than 3 ohm in the high position data line CAN_H, low data line CAN_L of described CAN network respectively;
Second step, detect the voltage at described two resistance two ends, and two magnitudes of voltage detected to be amplified by amplifier and A/D changes;
3rd step, calculate the current value flowing through described two resistance respectively;
4th step, when the absolute value that the 3rd step calculates gained two current values is unequal, namely determine that CAN network exists short trouble.
The invention has the advantages that and be that observation circuit is simple and practical, little to CAN web influence, can carry out Real-Time Monitoring, the very first time finds potential faults.
Accompanying drawing explanation
Fig. 1 is that the present invention carries out the schematic diagram of shorted to earth on-line monitoring to CAN network.
Embodiment
As shown in Figure 1, CAN shorted to earth on-line monitoring method of the present invention, carries out according to following step:
The first step, to connect in the high position data line CAN_H, low data line CAN_L of CAN network resistance value resistance R1, R2 at 1 Ω-3 Ω first respectively;
Second step, detect voltage U 1, the U2 at described two resistance R1, R2 two ends, and two magnitudes of voltage detected are amplified respectively by amplifier A1, A2 and A/D conversion;
3rd step, calculate the current value flowing through described two resistance R1, R2 respectively;
If when the absolute value of the 4th step the 3rd step calculating gained two current values is unequal, can determine that CAN network exists short trouble; This is because CAN network is not when having short trouble, flowing through two current values of CAN network same point high position data line CAN_H, low data line CAN_L, should be that equal and opposite in direction direction is contrary.

Claims (1)

1. a CAN shorted to earth on-line monitoring method, is characterized in that: carry out according to following step:
The first step, the resistance that a series connection resistance value is less than 3 ohm in the high position data line CAN_H, low data line CAN_L of described CAN network respectively;
Second step, detect the voltage at described two resistance two ends, and two magnitudes of voltage detected to be amplified by amplifier and A/D changes;
3rd step, calculate the current value flowing through described two resistance respectively;
4th step, when the absolute value that the 3rd step calculates gained two current values is unequal, namely determine that CAN network exists short trouble.
CN201410812547.1A 2014-12-24 2014-12-24 Method for on-line monitoring of grounding short circuit by CAN bus Pending CN104569717A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410812547.1A CN104569717A (en) 2014-12-24 2014-12-24 Method for on-line monitoring of grounding short circuit by CAN bus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410812547.1A CN104569717A (en) 2014-12-24 2014-12-24 Method for on-line monitoring of grounding short circuit by CAN bus

Publications (1)

Publication Number Publication Date
CN104569717A true CN104569717A (en) 2015-04-29

Family

ID=53086249

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201410812547.1A Pending CN104569717A (en) 2014-12-24 2014-12-24 Method for on-line monitoring of grounding short circuit by CAN bus

Country Status (1)

Country Link
CN (1) CN104569717A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105182965A (en) * 2015-09-09 2015-12-23 安徽江淮汽车股份有限公司 Control unit fault test system and method
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
CN109738728A (en) * 2019-01-17 2019-05-10 盛瑞传动股份有限公司 EOL detection module and detection device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105182965A (en) * 2015-09-09 2015-12-23 安徽江淮汽车股份有限公司 Control unit fault test system and method
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
WO2018133005A1 (en) * 2017-01-19 2018-07-26 深圳欣锐科技股份有限公司 Can signal line earthing short-circuit test device
CN109738728A (en) * 2019-01-17 2019-05-10 盛瑞传动股份有限公司 EOL detection module and detection device

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Application publication date: 20150429

WD01 Invention patent application deemed withdrawn after publication