Method and device for diagnosing automotive electronic control unit faults based on semi-physical simulation

Abstract

The invention relates to a method and a device for diagnosing automotive electronic control unit faults based on semi-physical simulation. The method comprises the steps that (1) a personal computer (PC) and a control system send standard input information to an electronic control unit to be detected and send standard output response information to a fault diagnosis and display module; (2) the electronic control unit to be detected processes and sends out the output response information; (3) the fault diagnosis and display module compares the standard output response information with output response information of electronic control unit (ECU) to be detected to draw a conclusion whether the electronic control unit to be detected breaks down; and (4) changing some input information, and diagnosing fault properties of the electronic control unit to be detected. The device comprises the PC, the control system and a simulation controller. Compared with the prior art, by means of the method and the device for diagnosing the automotive electronic control unit faults based on the semi-physical simulation, the fault clearing flow of an automotive electronic control is greatly simplified, the fault clearing range is narrowed, the fault diagnosis rate is further improved, maintenance workload result from diagnosis of replacement parts and fund employment amount of stock parts are effectively reduced, thus the maintenance cost is greatly reduced.

Description

technical field [0001] The invention relates to a method and a device for an automobile fault, in particular to a method and a device for diagnosing a fault of an electric control unit of an automobile based on semi-physical simulation. Background technique [0002] The fault diagnosis of the automobile electronic control system is generally through the special fault diagnosis interface on the car, and the decoder is used to read the fault code output from the automobile ECU (electronic control unit), explain the fault code, and display the fault content. This diagnosis mode is a passive reading fault diagnosis mode, and cannot diagnose the internal faults and dynamic faults of the ECU. Automotive ECU fault codes can be generated in the following aspects: 1. The sensor itself is faulty, that is, the sensor cannot work normally; 2. The signal transmission medium is faulty, that is, the car wiring harness is short-circuited and the circuit is faulty; 3. Internal hardware fault...

AI Technical Summary

Problems solved by technology

Due to the narrow and compact installation locations of automotive sensors and actuators, the laying and routing of wiring harnesses is very complicated, and sometimes repairs are delayed because there are no qualified replacement parts to order, and the late arrival of accessories may not be the root cause of the failure

Obviously, this maintenance method not only takes a lot of manpower and time, but also must stock a large number of qualified parts including ECU

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