Two-way can communication method and module for electric vehicle power system

Abstract

The invention provides a power system double-circuit CAN communication method for an electric vehicle. A power system comprises a motor controller, a battery controller, a vehicle control unit and the like. Each controller is suitable for being connected to double-circuit CANs including the CAN1 and the CAN2. Under the normal running condition in the double-circuit CAN connecting process, all the controllers communicate in preset manners through the CAN1 or the CAN2. The method includes the fault detection step in which each controller conducts CAN communication fault detection, the fault processing step in which a fault processing mode is started when it is detected that communication faults occur to both the CAN1 and the CAN2, and the network switching step in which network switching is conducted between the CAN1 and the CAN2 when it is detected that communication of one of the CAN1 and the CAN2 is normal and the communication fault occurs to the other of the CAN1 and the CAN2. The invention further provides a power system double-circuit CAN communication module for the electric vehicle. By the adoption of the method and module, under the condition that a network fault occurs, a function signal can be switched between the double-circuit CANs, and therefore the reliable traveling of the vehicle is guaranteed.

Description

technical field [0001] The present invention relates to the field of CAN (Controller Local Area Network) network architecture design and application method of the electric vehicle power system, in particular to a dual-channel CAN communication method and module of the electric vehicle power system, which utilizes the dual-channel CAN communication mode of the power system to realize vehicle Reliable control of driving, so that even if a network failure occurs during vehicle driving, reliable vehicle driving can still be guaranteed. Background technique [0002] In the field of traditional vehicles, the power system is mainly composed of an engine controller and a gearbox controller, and each controller adopts single-channel CAN communication to realize the transmission of functional signals. In the field of electric vehicles, new energy components are generally used for single-channel CAN communication. For example, for a hybrid electric vehicle with complex functions, due ...

AI Technical Summary

Problems solved by technology

[0003] Due to the complex electromagnetic phenomena of electric vehicles, if there are serious network failures during the driving of the vehicle, such as bus shutdown, CAN transceiver failure of the controller, etc., the vehicle's capacity will be limited, and even power will be lost.

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