CAN communication signal verification and transmission method and system for automobile

Abstract

The invention provides a CAN communication signal verification and transmission method and system for an automobile. The method comprises the steps that a sending controller generates a control signal and a count value, the control signal is verified, and verification information is generated; a first safety checksum and a CAN message are generated according to the control signal, the verification information and the count value; a receiving controller receives the CAN message and extracts the control signal, the verification information, the count value and the first safety checksum; after the receiving controller judges that the CAN message is a valid message, a second safety checksum is generated according to the control signal, the verification information and the count value; the first safety checksum is compared with the second safety checksum; if the comparison result meets the preset condition, it is judged that the control signal is correct. According to the CAN communication signal verification and transmission method and system for the automobile, the control signal can be effectively prevented from generating mistakes during residence or evaluation inside the sending controller or the receiving controller. In addition, the CAN communication signal verification and transmission method for the automobile is easy to implement and high in applicability.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a CAN communication signal verification and transmission method and system for automobiles. Background technique [0002] Hybrid cars generally adopt a distributed control system based on high-speed CAN (Controller Area Network, Controller Area Network) communication. The HCU (Hybrid Control Unit, hybrid controller) responsible for vehicle torque management, the engine management system directly responsible for torque generation, the motor controller MCU (Micro Control Unit, micro control unit) responsible for motor control, and the electronic control unit that can generate torque requests The key torque control information needs to be exchanged between modules such as the stability program, and the torque control information is transmitted through CAN. Once these key CAN signals are wrongly transmitted and cannot be recognized by the controller, it will deviate from the d...

AI Technical Summary

Problems solved by technology

Among them, the CRC (Cyclic Redundancy Check, Cyclic Redundancy Check Code) in the CAN controller and the mechanism of CAN itself such as the response can ensure the correct transmission of CAN messages in the buffers of the sending node and the receiving node, but cannot guarantee that the signal is transmitted from the upper layer. Correctness of the application software to the message buffer

In addition, if the CAN controller repeatedly sends the same message due to a fault, it will not be able to identify

[0004] To solve this problem in the prior art, the cycle counter and XOR checksum are generally set in the message, but the processing method is generally processed by the underlying software on the cycle counter and the XOR checksum, and the key variable is from the upper layer application software to the bottom layer There is still a risk of data error during CAN software transmission

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