Error variance detection method of CAN communication system and the CAN communication system

Abstract

An error variance detection method of CAN communication system according to an exemplary embodiment of the present invention may include storing an error information that corresponds to the communication error in a network management start message, if an communication error is occurred in the CAN communication system, by at least one of a plurality of slave ECU, transferring the network management start message to a master ECU, by at least one of a plurality of slave ECU, determining whether there is or is not the error information in response to the network management start message, by the master ECU, detecting the error information from the network management start message, if there is the error information, by the master ECU, and transmitting the error information detected by a demand of a diagnosis device to the diagnosis device, by the master ECU.

Description

technical field [0001] The invention relates to an error decentralized detection method of a CAN communication system and the CAN communication system. Background technique [0002] In recent years, vehicles are equipped with various electronic control units (Electronic Control Unit, ECU). Connecting these ECUs to a common network bus of one or two wires that runs around the vehicle in the same way that a desktop personal computer (PC) in an office is connected can significantly reduce the amount of wiring in the vehicle , can also reduce the total manufacturing cost of the vehicle. Such a network is called a controller area network (ControllerAreaNetwork, CAN). [0003] The electronic control units used for CAN communication are connected through a common network bus, and each electronic control unit uses the CAN controller (CANController) included in the electronic control unit to transmit / receive messages about independent control information, thereby maintaining the mo...

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Problems solved by technology

[0004] However, if a CAN communication error occurs during the transmission / reception process between the electronic control units, the CAN controller and the CAN controller that detects it repeatedly transmit error frames, which will have a bad influence on the network and cause the CAN communication line to be inactive. state of no communication

That is, if a CAN communication error occurs, it is difficult for existing diagnostic devices to diagnose the status of the CAN controller that actually performs CAN communication or the status of software related to CAN communication due to the CAN communication line that cannot communicate.

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