CN112835343A - Method for rapidly checking error frames of CAN (controller area network) bus of whole vehicle - Google Patents
Method for rapidly checking error frames of CAN (controller area network) bus of whole vehicle Download PDFInfo
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- CN112835343A CN112835343A CN202110002782.2A CN202110002782A CN112835343A CN 112835343 A CN112835343 A CN 112835343A CN 202110002782 A CN202110002782 A CN 202110002782A CN 112835343 A CN112835343 A CN 112835343A
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- bus
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B23/00—Testing or monitoring of control systems or parts thereof
- G05B23/02—Electric testing or monitoring
- G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
- G05B23/0208—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterized by the configuration of the monitoring system
- G05B23/0213—Modular or universal configuration of the monitoring system, e.g. monitoring system having modules that may be combined to build monitoring program; monitoring system that can be applied to legacy systems; adaptable monitoring system; using different communication protocols
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/24—Pc safety
- G05B2219/24065—Real time diagnostics
Abstract
The invention discloses a method for rapidly checking the error frame of a CAN bus of a whole vehicle, which is characterized by comprising the following steps: the bus baud rate mismatching checking method comprises the following steps of 1; step 2, checking fault-tolerant error frames; step 3, checking a bit filling error frame; step 4, the single controller CAN _ H and CAN _ L are reversely connected for checking; and 5, checking the bus ID collision. According to the invention, the fault can be judged by detecting the error in any step of the steps 1-4, the whole process is not required to be completed, and the detection efficiency is high.
Description
Technical Field
The invention relates to the technical field of automobile networks, in particular to a method for quickly checking error frames of a CAN (controller area network) bus of a whole automobile.
Background
The traditional automobile has single function and simple structure, the number of CAN network nodes of the whole automobile is small, the mutual interference of data streams of buses is small, the bus fault diagnosis is relatively simple, and generally a simple reverse flow diagnosis scheme CAN be adopted for fault diagnosis, namely a fault node elimination method (a controller plug connector is pulled out). With the development of automobile entertainment, intellectualization and electromotion, more and more nodes are arranged on a single CAN network, the number of the nodes is increased to more than 10 through 4-5 nodes, the interference factors of each node on each controller in the whole automobile network are increased, and if a reverse fault node elimination method is adopted, the fault diagnosis time is long, and the cause of CAN fault CAN not be positioned.
Disclosure of Invention
The invention aims to solve the defects in the background technology and provides a method for quickly checking the error frames of the CAN bus of the whole vehicle, which has high checking efficiency.
In order to achieve the aim, the invention discloses a method for quickly checking the error frame of a CAN bus of a whole vehicle, which is characterized by comprising the following steps: bus baud rate mismatch troubleshooting:
the ignition switch is in an ON gear, a bus VOCTOR CAN tool baud rate detection bus is switched, whether a whole vehicle message exists in the bus message or not is observed, a corresponding controller is locked according to the whole vehicle message information, and the baud rate of the controller is judged to be inconsistent with that of the whole vehicle;
as a preferable scheme of the invention, the method further comprises the following steps: troubleshooting error frames:
the ignition switch is in an ON gear, a VTCTOR CAN is adopted to detect that the bus has no message, and the following investigation is carried out:
disconnecting the cathode of the storage battery, and detecting whether the OBD diagnosis interface CAN _ H and CAN _ L are conducted or not by using a universal meter
If the CAN _ H and CAN _ L wiring harnesses are communicated, the whole vehicle CAN _ H and CAN _ L wiring harnesses need to be checked;
disconnecting the cathode of the storage battery, detecting whether the OBD diagnosis interface CAN _ H is conducted with the ground or not by using a universal meter, and if the OBD diagnosis interface CAN _ H is conducted with the ground, further checking a CAN _ H wire harness;
disconnecting the cathode of the storage battery, detecting whether the OBD diagnosis interface CAN _ H is connected with a power supply or not by using a universal meter, and if the OBD diagnosis interface CAN _ H is connected with the power supply, further checking a CAN _ H wire harness;
disconnecting the cathode of the storage battery, detecting whether the OBD diagnosis interface CAN _ L is conducted with the power supply by using a universal meter,
if the CAN _ L wiring harness is conducted, the CAN _ L wiring harness needs to be further checked.
Further, the method also comprises the following steps: bit stuffing error frame checking:
and the ignition switch is in an ON gear, a VTCTOR CAN is adopted to detect that an error frame exists in a bus, the detailed information of the error frame is expanded, whether a stuff error exists is checked, if so, the controller is further positioned through an ID, and the error frame is filled.
Still further, the method comprises the steps of: and the single controller CAN _ H and CAN _ L are reversely connected for checking:
and the ignition switch is in an ON gear, pins of a CAN _ H and a CAN _ L of the reverse connection test tool are connected for bus monitoring, whether a whole vehicle message exists is observed, if so, a corresponding controller is positioned according to the whole vehicle message, and the CAN _ H and the CAN _ L are connected reversely.
Still further, the method comprises the steps of: bus ID collision checking:
and (3) the ignition switch is in an ON gear, a VTCTOR CAN detection bus is adopted to observe whether the message period has a sudden change condition, if so, the corresponding controller is disconnected, the monitoring is continued, if corresponding message IDs (identities) need to be further checked, and if not, the fault of the corresponding controller is judged.
According to the invention, the error frame of the CAN bus is checked through five steps which are gradually advanced, and the fault CAN be judged by detecting the error in any step without running the whole process, so that the detection efficiency is high.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
The invention will now be described in further detail, including the preferred embodiments, with reference to the accompanying drawings and by way of illustration of some alternative embodiments of the invention. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
The embodiment discloses a method for rapidly checking an error frame of a CAN (controller area network) bus of a whole vehicle, which is characterized by comprising the following steps of:
step 1, bus baud rate mismatching investigation:
the ignition switch is in ON grade, switch over bus VOCTOR CAN (such as CANoe) tool baud rate (if the whole car is 250Kbps/s, switch over to 500 Kbps/s; if the whole car bus is 500Kbps/s, switch over to 250Kbps/s) detection bus, observe whether the bus message has the whole car message, lock the corresponding controller according to the whole car message information, judge that this controller baud rate is not in accordance with the whole car;
step 2, checking fault-tolerant error frames:
the ignition switch is in ON gear, VTCTOR CAN (such as CANoe) is adopted to detect the bus has no message, and the investigation is as follows:
disconnecting the cathode of the storage battery, detecting whether the OBD diagnosis interfaces CAN _ H and CAN _ L are conducted (the resistance is less than 5 omega) by using a universal meter, and if the OBD diagnosis interfaces CAN _ H and CAN _ L are conducted, checking the harnesses of the CAN _ H and the CAN _ L of the whole vehicle;
disconnecting the cathode of the storage battery, detecting whether the OBD diagnosis interface CAN _ H is conducted with the ground or not by using a universal meter, and if the OBD diagnosis interface CAN _ H is conducted with the ground, further checking a CAN _ H wire harness;
disconnecting the cathode of the storage battery, detecting whether the OBD diagnosis interface CAN _ H is connected with a power supply or not by using a universal meter, and if the OBD diagnosis interface CAN _ H is connected with the power supply, further checking a CAN _ H wire harness;
disconnecting the cathode of the storage battery, detecting whether the OBD diagnosis interface CAN _ L is conducted with the power supply by using a universal meter,
if the CAN _ L wiring harness is conducted, the CAN _ L wiring harness needs to be further checked.
Step 3, checking a bit filling error frame:
and (3) the ignition switch is in an ON gear, a VTCTOR CAN (such as CANoe) is adopted to detect that an error frame exists in the bus, the detailed information of the error frame is expanded, whether a stuff error exists is checked, if so, the controller is further positioned through an ID, and the error frame is bit-filled.
Step 4, the single controller CAN _ H and CAN _ L are reversely connected for checking:
the ignition switch is in ON gear, the pins of CAN _ H and CAN _ L of a reverse connection testing tool (such as CANoe) are subjected to bus monitoring, whether a message of the whole vehicle exists or not is observed, if so, a corresponding controller is positioned according to the message of the whole vehicle, and the CAN _ H and CAN _ L are reversely connected.
And 5, bus ID collision checking:
and (3) detecting a bus by adopting a VTCTOR CAN (such as CANoe) when the ignition switch is in an ON gear, observing whether the message period has a sudden change condition, if so, disconnecting the corresponding controller, continuing monitoring, if still having the corresponding message ID, further checking the corresponding ID source, and if not, judging that the corresponding controller has a fault.
In the embodiment, the fault can be judged by detecting the error in any step of the steps 1 to 4, the whole process is not required to be run out, and the detection efficiency is high.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and any modification, combination, replacement, or improvement made within the spirit and principle of the present invention is included in the scope of the present invention.
Claims (5)
1. A method for rapidly checking error frames of a CAN bus of a whole vehicle is characterized by comprising the following steps:
bus baud rate mismatch troubleshooting:
the ignition switch is in an ON gear, the bus VOCTOR CAN tool baud rate detection bus is switched, whether the bus message has a whole vehicle message or not is observed, a corresponding controller is locked according to the whole vehicle message information, and the baud rate of the controller is judged to be inconsistent with that of the whole vehicle.
2. The method for rapidly checking the error frames of the CAN bus of the whole vehicle according to claim 1, further comprising the steps of:
troubleshooting error frames:
the ignition switch is in an ON gear, a VTCTOR CAN is adopted to detect that the bus has no message, and the following investigation is carried out:
disconnecting the cathode of the storage battery, detecting whether the OBD diagnosis interface CAN _ H and CAN _ L are conducted or not by using a universal meter, and if so, checking the harnesses of the CAN _ H and the CAN _ L of the whole vehicle;
disconnecting the cathode of the storage battery, detecting whether the OBD diagnosis interface CAN _ H is conducted with the ground or not by using a universal meter, and if the OBD diagnosis interface CAN _ H is conducted with the ground, further checking a CAN _ H wire harness;
disconnecting the cathode of the storage battery, detecting whether the OBD diagnosis interface CAN _ H is connected with a power supply or not by using a universal meter, and if the OBD diagnosis interface CAN _ H is connected with the power supply, further checking a CAN _ H wire harness;
and disconnecting the cathode of the storage battery, detecting whether the OBD diagnosis interface CAN _ L is connected with the power supply by using a universal meter, and if the OBD diagnosis interface CAN _ L is connected with the power supply, further checking the CAN _ L wire harness.
3. The method for rapidly checking the error frames of the CAN bus of the whole vehicle according to claim 2, further comprising the steps of:
bit stuffing error frame checking:
and the ignition switch is in an ON gear, a VTCTOR CAN is adopted to detect that an error frame exists in a bus, the detailed information of the error frame is expanded, whether a stuff error exists is checked, if so, the controller is further positioned through an ID, and the error frame is filled.
4. The method for rapidly checking the error frames of the CAN bus of the whole vehicle according to claim 3, further comprising the steps of:
and the single controller CAN _ H and CAN _ L are reversely connected for checking:
and the ignition switch is in an ON gear, pins of a CAN _ H and a CAN _ L of the reverse connection test tool are connected for bus monitoring, whether a whole vehicle message exists is observed, if so, a corresponding controller is positioned according to the whole vehicle message, and the CAN _ H and the CAN _ L are connected reversely.
5. The method for rapidly checking the error frames of the CAN bus of the whole vehicle according to claim 4, further comprising the steps of:
bus ID collision checking:
and (3) the ignition switch is in an ON gear, a VTCTOR CAN detection bus is adopted to observe whether the message period has a sudden change condition, if so, the corresponding controller is disconnected, the monitoring is continued, if corresponding message IDs (identities) need to be further checked, and if not, the fault of the corresponding controller is judged.
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| CN202110002782.2A CN112835343A (en) | 2021-01-04 | 2021-01-04 | Method for rapidly checking error frames of CAN (controller area network) bus of whole vehicle |
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| CN202110002782.2A CN112835343A (en) | 2021-01-04 | 2021-01-04 | Method for rapidly checking error frames of CAN (controller area network) bus of whole vehicle |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN117376058A (en) * | 2023-12-07 | 2024-01-09 | 武汉神动汽车电子电器股份有限公司 | CAN bus baud rate self-adaption method |
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Application publication date: 20210525 |