Vehicle-mounted diagnosis system

Abstract

The invention aims to provide a vehicle-mounted diagnosis system, which can diagnose faults of equipment which is connected with a vehicle body controller through an LIN bus. The vehicular diagnosis system of the invention comprises external diagnosis equipment and the vehicle body controller which has an LIN gateway and a CAN gateway, wherein the vehicle body controller communicates with secondary node equipment through the LIN bus; and the vehicle body controller communicates with the external diagnosis equipment through the CAN bus. The key points of the vehicle-mounted diagnosis system include: the external diagnosis equipment sends a CAN request message to the vehicle body controller through the CAN bus; the vehicle body controller receives the CAN request message, converts the CAN request message into an LIN request message and then sends the LIN request message to the secondary node equipment of the LIN bus; the LIN bus receives the LIN request message from the secondary node equipment and then sends an LIN response message to the vehicle body controller; and the vehicle body controller receives the LIN response message, converts the LIN response message to a CAN response message and then sends the CAN response message to the external diagnosis equipment.

Description

technical field [0001] The invention belongs to the technical field of on-board diagnosis of automobiles, and in particular relates to the application of CAN bus and LIN bus. Background technique [0002] Due to the high cost of the CAN bus, some controllers on the car currently have simple structures and functions, low real-time requirements, and cost-sensitive controllers all use LIN bus technology, such as reversing radar modules, window anti-pinch modules, door modules, lights, etc. control module, etc. However, the body controller is not only connected to the devices on the LIN bus, but also connected to many devices with complex functions and high real-time requirements through the CAN bus. The general on-board diagnosis is realized by using external diagnostic equipment to communicate with the body controller through the CAN bus. , it is impossible to directly diagnose the equipment connected to the body controller through the LIN bus. Contents of the invention ...

AI Technical Summary

Problems solved by technology

However, the body controller is not only connected to the devices on the LIN bus, but also connected to many devices with complex functions and high real-time requirements through the CAN bus. The general on-board diagnosis is realized by using external diagnostic equipment to communicate with the body controller through the CAN bus. , cannot directly diagnose the equipment connected to the body controller through the LIN bus

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