The offline fault diagnosis of FCV powertrain based on CAN bus

This paper introduces an offline fault diagnosis method based on CAN bus for fuel cell vehicles powertrain, which synthetically applies CAN bus communication technology, embedded system development technology, hierarchical fault processing technology and computer technology. Meanwhile, PC was applied as upper machine while the vehicle management system controller (VMS) based on MPC555 as lower machine. The upper machine and under-bit machine realize communication through CANdela protocol to record, upload and statistics analyses the fault. Such fault diagnosis system, which successfully complete the online fault record and offline fault diagnosis for powertrain, has been applied to ldquoSTART IIIrdquo fuel cell car developed by shanghai FCV powertrain Co., Ltd.