Method and system for refreshing ECU (Electronic Control Unit) embedded software and downloading program

Abstract

The invention discloses a method and system for refreshing ECU (Electronic Control Unit) embedded software and downloading a program. The system comprises a test node Tester, a standard communication line and a test terminal, wherein the test terminal of the system is provided with a read-only program memory and a dynamic program memory, and the test node Tester is provided with the dynamic program memory. The method for refreshing software and downloading a program is characterized in that update software is separated from the test terminal; only when the software is refreshed at the test terminal, the update software is downloaded from the test node Tester to the dynamic program memory of the test terminal to operate, thus achieving the purpose of refreshing the software at the test terminal. Because the update software is downloaded and stored in the dynamic program memory of the test terminal instead of being firmed in the test terminal, the update software in the test terminal is lost after the test terminal is restarted; and when the test terminal program is abnormal, mistaken erasure write operation to the vehicle ECU can be effectively prevented so as to improve the system data safety.

Description

technical field [0001] The present invention relates to an automobile diagnosis method and a diagnosis system, in particular to a method and system for updating and downloading embedded software of an ECU (Electronic Control Unit, electronic control unit) based on automobile bus technology, especially the introduction of A security strategy for protecting ECU data. [0002] Background technique [0003] With the development of automobile technology, people have higher and higher requirements for vehicle safety and comfort, the number of on-board electronic control units is also increasing, the mechanism is becoming more and more complex, and the functions are gradually enhanced. The higher the higher; now many vehicle-mounted control modules have added on-board diagnostic functions to detect the driving status of the vehicle in real time; once a fault is found, it will choose whether to immediately notify the driver through the indicator light according to the importance of...

AI Technical Summary

Problems solved by technology

Some existing diagnostic test systems mainly refresh the target ECU directly. This method has extremely poor security for the data on the ECU, and it is easy to misuse the data; another method is to update the data on the ECU. When refreshing, some method of password verification is required, such as an implementation method of Chery Company (patent application number: 200910172930 publication number: CN101692017), but this method increases the complexity of the operation and requires more work such as password verification The system burden is reduced, and the program for erasing and writing the ECU is still fixed on the target ECU, so that when the program is abnormal, it is very likely to execute the program for erasing and writing the ECU, which will cause serious errors

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