CN112193072A - Method for checking error frames of CAN (controller area network) bus of electric vehicle - Google Patents
Method for checking error frames of CAN (controller area network) bus of electric vehicle Download PDFInfo
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- CN112193072A CN112193072A CN202011052031.3A CN202011052031A CN112193072A CN 112193072 A CN112193072 A CN 112193072A CN 202011052031 A CN202011052031 A CN 202011052031A CN 112193072 A CN112193072 A CN 112193072A
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- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
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Abstract
The invention aims to provide a method for checking error frames of a CAN bus of an electric vehicle, which CAN quickly lock an electric control unit sending the error frames, shorten the troubleshooting period and improve the stability of the whole vehicle. The method for checking the error frame of the CAN bus of the electric automobile comprises the following steps: A. when the CAN bus of the whole vehicle has error frames, firstly detecting whether the terminal resistance of the CAN bus is normal; B. detecting whether error frames still occur when the whole vehicle key is in a power-off state so as to narrow the investigation range; C. observing whether the whole vehicle reports a fault when the CAN bus has an error frame so as to reduce the investigation range; D. and gradually removing the electric control unit on the CAN bus by an elimination method, recording data, and observing whether an error frame exists or not until the source of the error frame is locked. By combining the software and hardware troubleshooting methods, the invention greatly shortens the troubleshooting period and improves the running stability of the whole vehicle, thereby improving the market competitiveness of the whole vehicle.
Description
Technical Field
The invention relates to the technical field of CAN bus faults, in particular to a method for checking an error frame of a CAN bus of an electric vehicle.
Background
With the application and popularization of pure electric vehicles becoming more and more popular, people not only pay attention to energy conservation and environmental protection of electric vehicles, but also pay more and more attention to functional diversity and driving intellectualization of the electric vehicles. In order to realize various functions, more and more electric control units are arranged on the whole vehicle, each unit transmits data by means of a CAN bus to exchange data information, the control function of the whole system is realized, and the interaction of the CAN bus becomes more complex. When a CAN bus error frame occurs in the whole vehicle, the real-time performance and stability of data transmission on the CAN bus CAN be influenced, and even communication faults or associated faults CAN occur. The current common tool does not have the function of locking the error frame module, so that the troubleshooting difficulty is high, and the troubleshooting period is long.
Disclosure of Invention
The invention aims to provide a method for checking error frames of a CAN bus of an electric vehicle, which CAN quickly lock an electric control unit sending the error frames, shorten the troubleshooting period and improve the stability of the whole vehicle.
The method for checking the error frame of the CAN bus of the electric automobile comprises the following steps:
A. when the CAN bus of the whole vehicle has error frames, firstly detecting whether the terminal resistance of the CAN bus is normal;
B. detecting whether error frames still occur when the whole vehicle key is in a power-off state so as to narrow the investigation range;
C. observing whether the whole vehicle reports a fault when the CAN bus has an error frame so as to reduce the investigation range;
D. and gradually removing the electric control unit on the CAN bus by an elimination method, recording data, and observing whether an error frame exists or not until the source of the error frame is locked.
Specifically, in the step a, a universal meter is used for measuring the resistance between the high CAN and the low CAN of the DLC end in the CAN network, if the resistance value is within a predetermined range, the step B is executed, if the resistance value is beyond the predetermined range, the terminal resistances at the two ends of the CAN network are respectively measured, if the terminal resistance value is within the predetermined range, the step B is executed, otherwise, the corresponding terminal resistance is replaced.
And in the step B, setting the state of the automobile key into a power-off state, and monitoring whether an error frame still appears on the CAN bus: if the error frame still appears on the CAN bus, setting the troubleshooting range of the error frame source as the electric control unit which still keeps working when the key is in the power-off state, otherwise, setting the troubleshooting range of the error frame source as the electric control unit which does not keep working when the key is in the power-off state.
And in the step C, if the whole vehicle reports faults when the CAN bus has error frames, setting the troubleshooting range of the error frame source as an electric control unit related to fault triggering, and otherwise, setting the troubleshooting range of the error frame source as an electric control unit unrelated to fault triggering.
The step D comprises the following sub-steps:
d1, removing the electric control unit from the CAN bus, and observing whether the CAN bus still has error frames when removing one electric control unit: if the error frame disappears, executing the step D2, otherwise, changing the next electronic control unit, and executing the step D1 again;
d2, marking the electric control unit which is just removed as a suspected electric control unit, resetting the suspected electric control unit, and observing whether the error frame reappears: if the error frame is reproduced, the next electronic control unit is replaced, and the step D1 is executed again, otherwise, the step D3 is executed;
d3, removing the suspected electric control unit, resetting other electric control units, and observing whether the error frame reappears: if the error frame is reproduced, the next electronic control unit is replaced, and the step D1 is executed again; if the error frame is not reproduced, the suspected ECU is determined to be the source of the error frame.
Further, in the step D, in order to increase the speed of the troubleshooting, the electronic control units within the troubleshooting range are removed step by step, and then the electronic control units outside the troubleshooting range are removed step by step. Specifically, the electronic control units respectively in the investigation ranges set in the two steps B, C are removed step by step, the electronic control units only in the investigation ranges set in the step B or the step C are removed step by step, and finally the electronic control units outside the investigation ranges are removed step by step.
The method for checking the error frames of the CAN bus of the electric automobile greatly shortens the fault checking period and improves the running stability of the whole automobile by combining the software and hardware checking method, thereby improving the market competitiveness of the whole automobile.
Drawings
Fig. 1 is a topology diagram of a CAN bus network of embodiment 1.
Fig. 2 is a flowchart of a CAN bus error frame checking method according to embodiment 1.
Detailed Description
The following describes embodiments of the present invention, such as shapes and structures of respective members, mutual positions and connection relationships between respective portions, and actions and operation principles of the respective portions, in further detail, with reference to the accompanying drawings.
Example 1:
the embodiment provides a method for checking error frames of a CAN bus of an electric vehicle, which CAN quickly lock an electric control unit sending the error frames, shorten a troubleshooting period and improve the stability of the whole vehicle.
In this embodiment, a PCAN tool (PCAN is also called PCAN-USB, and is also called a CAN card, which is a CAN-to-USB interface, and CAN transmit a message on a CAN network to a PC through the USB interface, and view the CAN message through related software) and a PCAN upper computer are used to monitor whether an error frame occurs on the CAN network and a specific message of the error frame, and a universal meter is used to measure the resistance between a CAN high and a CAN low on the CAN bus.
The embodiment is directed to a topological diagram of a CAN bus network as shown in fig. 1, which lists related electronic control units on a CAN bus and an electronic control unit where a terminal resistor is located. The method for checking the error frame of the CAN bus of the electric vehicle in the embodiment is based on the CAN bus network topology in fig. 1, and comprises the following steps:
A. when the CAN bus of the whole vehicle has error frames, firstly detecting whether the terminal resistance of the CAN bus is normal;
B. detecting whether error frames still occur when the whole vehicle key is in a power-off state so as to narrow the investigation range;
C. observing whether the whole vehicle reports a fault when the CAN bus has an error frame so as to reduce the investigation range;
D. and gradually removing the electric control unit on the CAN bus by an elimination method, recording data, and observing whether an error frame exists or not until the source of the error frame is locked.
The specific flow is shown in fig. 2:
A. and when the CAN bus of the whole vehicle has error frames, measuring the resistance between the high CAN and the low CAN of the DLC end in the CAN network by using a universal meter, if the resistance value is within a preset range (55-65 omega), executing the step B, if the resistance value exceeds the preset range, firstly measuring the terminal resistance between the high CAN and the low CAN of the MCU end, then measuring the terminal resistance between the high CAN and the low CAN of the DCDC end, if the terminal resistance values at the two ends of the CAN bus are within the preset range, executing the step B, and if the terminal resistance values at the two ends of the CAN bus are within the preset range, replacing the corresponding terminal resistance.
B. Set up the car key state into down the electric state, whether error frame still appears on the monitoring CAN bus: if the error frame still appears on the CAN bus, setting the troubleshooting range of the error frame source as the electric control unit which still keeps working when the key is in the power-off state, otherwise, setting the troubleshooting range of the error frame source as the electric control unit which does not keep working when the key is in the power-off state.
C. And if the whole vehicle reports the fault when the CAN bus has the error frame, setting the troubleshooting range of the error frame source as the electric control unit related to the fault trigger, otherwise, setting the troubleshooting range of the error frame source as the electric control unit unrelated to the fault trigger.
D. The method comprises the following steps:
d1, removing the electric control unit from the CAN bus, and observing whether the CAN bus still has error frames when removing one electric control unit: if the error frame disappears, executing the step D2, otherwise, changing the next electronic control unit, and executing the step D1 again;
d2, marking the electric control unit which is just removed as a suspected electric control unit, resetting the suspected electric control unit, and observing whether the error frame reappears: if the error frame is reproduced, the next electronic control unit is replaced, and the step D1 is executed again, otherwise, the step D3 is executed;
d3, removing the suspected electric control unit, resetting other electric control units, and observing whether the error frame reappears: if the error frame is reproduced, the next electronic control unit is replaced, and the step D1 is executed again; if the error frame is not reproduced, the suspected ECU is determined to be the source of the error frame.
In the step D, the electronic control units within the troubleshooting range are removed step by step, and then the electronic control units outside the troubleshooting range are removed step by step. Specifically, the electronic control units respectively in the investigation ranges set in the two steps B, C are removed step by step, the electronic control units only in the investigation ranges set in the step B or the step C are removed step by step, and finally the electronic control units outside the investigation ranges are removed step by step.
The invention has been described in connection with the accompanying drawings, it is to be understood that the invention is not limited in its application to the details of construction and the arrangement of the components set forth in the following description, as long as the invention is capable of being practiced without modification in any way whatsoever, and is capable of other applications without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A method for checking an error frame of a CAN bus of an electric vehicle is characterized by comprising the following steps:
A. when the CAN bus of the whole vehicle has error frames, firstly detecting whether the terminal resistance of the CAN bus is normal;
B. detecting whether error frames still occur when the whole vehicle key is in a power-off state so as to narrow the investigation range;
C. observing whether the whole vehicle reports a fault when the CAN bus has an error frame so as to reduce the investigation range;
D. and gradually removing the electric control unit on the CAN bus by an elimination method, recording data, and observing whether an error frame exists or not until the source of the error frame is locked.
2. The method as claimed in claim 1, wherein in the step a, a universal meter is used to measure the resistance between the CAN high and the CAN low of the DLC terminal in the CAN network, if the resistance value is within a predetermined range, the step B is performed, if the resistance value is out of the predetermined range, the terminal resistances at both ends of the CAN network are measured, if the terminal resistance value is within the predetermined range, the step B is performed, otherwise, the corresponding terminal resistance is replaced.
3. The method for checking the CAN bus error frame of the electric vehicle according to claim 1, wherein in the step B, the state of the vehicle key is set to a power-down state, and whether the CAN bus error frame still appears is monitored: if the error frame still appears on the CAN bus, setting the troubleshooting range of the error frame source as the electric control unit which still keeps working when the key is in the power-off state, otherwise, setting the troubleshooting range of the error frame source as the electric control unit which does not keep working when the key is in the power-off state.
4. The method for troubleshooting a CAN bus error frame of an electric vehicle of claim 1, wherein in the step C, if the whole vehicle reports a fault when the CAN bus has the error frame, the troubleshooting range of the source of the error frame is set as the electric control unit related to the fault trigger, otherwise, the troubleshooting range of the source of the error frame is set as the electric control unit unrelated to the fault trigger.
5. The method for checking the CAN bus error frame of the electric vehicle according to claim 1, 2, 3 or 4, wherein the step D comprises the following sub-steps:
d1, removing the electric control unit from the CAN bus, and observing whether the CAN bus still has error frames when removing one electric control unit: if the error frame disappears, executing the step D2, otherwise, changing the next electronic control unit, and executing the step D1 again;
d2, marking the electric control unit which is just removed as a suspected electric control unit, resetting the suspected electric control unit, and observing whether the error frame reappears: if the error frame is reproduced, the next electronic control unit is replaced, and the step D1 is executed again, otherwise, the step D3 is executed;
d3, removing the suspected electric control unit, resetting other electric control units, and observing whether the error frame reappears: if the error frame is reproduced, the next electronic control unit is replaced, and the step D1 is executed again; if the error frame is not reproduced, the suspected ECU is determined to be the source of the error frame.
6. The method for troubleshooting of CAN bus error frames of electric vehicles of claim 5 wherein in said step D, the electrical control units within the troubleshooting range are removed gradually first, and then the electrical control units outside the troubleshooting range are removed gradually.
7. The method for troubleshooting the CAN bus error frame of the electric vehicle as claimed in claim 6, wherein in the step D, the electric control units respectively set in the step B, C are removed gradually, the electric control units only set in the troubleshooting range set in the step B or the step C are removed gradually, and the electric control units outside the troubleshooting range are removed gradually.
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Cited By (3)
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| CN112964956A (en) * | 2021-03-19 | 2021-06-15 | 潍柴动力股份有限公司 | Method and device for detecting electromagnetic interference of vehicle |
| CN114002600A (en) * | 2021-11-12 | 2022-02-01 | 北京亿华通科技股份有限公司 | Error frame checking method of fuel cell engine test system |
| CN115242609A (en) * | 2022-07-13 | 2022-10-25 | 东风越野车有限公司 | Whole vehicle CAN bus fault frame analysis method and device and vehicle |
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| CN114002600B (en) * | 2021-11-12 | 2024-03-29 | 北京亿华通科技股份有限公司 | Error frame checking method of fuel cell engine test system |
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