SAE-J1939 vehicle bus node authentication ECU production method

Abstract

The invention discloses a SAE-J1939 vehicle bus node authentication ECU production method. An authentication ECUA is added on the bus, and the method comprises the following steps: (1) obtaining a clock offset between working ECUi (i is not smaller than 1 and is not greater than 29) and an authentication ECUA by using a mutual standard time; (2) after power up, sending a message of querying whether the own address is a used request stated address by the working ECUi, ad transmitting own SkewiA to the bus, obtaining, by the authentication node ECUA the clock offset between each ECUi and itself,and comparing the clock offset with the SkewiA obtained in step (1) to determine whether the ECUi is illegal ECU.

Description

technical field [0001] The invention relates to a SAE J1939 automobile bus node authentication electronic control unit ECU A (ElectronicControl Unit) generation method, especially related to the work unit ECU on the J1939 bus i with certified ECU A The only physical property of the clock skew between the ECU i The authenticity method and its realization and application on the J1939 bus. Background technique [0002] SAE J1394 is defined by the American Society of Automotive Engineers. It is mainly used for passenger cars, heavy trucks and other commercial vehicles, and can also be used for a set of standards for network connection and communication between internal electronic control units ECUs such as ships, rail locomotives, and agricultural machinery; its physical The layer is connected by a shielded twisted pair with a characteristic impedance of 120Ω, the transmission rate is 250kb / s, and the maximum number of ECUs in the same network is 30; [0003] J1939 uses CAN ...

AI Technical Summary

Problems solved by technology

Although the PDU unit contains the source address SA of the ECU, the SA can be changed and can be counterfeited, so the ECU node authentication through the source address cannot solve the authenticity problem of the ECU; and the message authentication is limited by the length of the CAN data field However, the message authentication code MAC cannot be added to the end of the data. Even if the MAC code of the data is transmitted separately after the data is sent, it will inevitably increase the bus load and the calculation overhead of verifying the message, thus affecting the data on the bus. Real-time performance of ECU

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