Communication fault judgment and treatment method of battery management system of hybrid electric vehicle

Abstract

The invention provides a communication fault judgment and treatment method of a battery management system of a hybrid electric vehicle. The communication fault judgment and treatment method comprisesthe steps that firstly, a battery data processing module of a harmony control unit (HCU) judges whether the communication is normal or not according to whether a data signal sent by a battery management system (BMS) can be received or not, if a communication fault is judged, the HCU begins recording the duration time of the communication fault, a battery data processing module of the HCU receivesdata signals sent from an engine management system (EMS), a power electronic unit (PEU), an air conditioner controller, an oil pump controller and a direct current dir cur (DCDC) controller in real time, P'<bat_actl> and SOC' after the communication fault according to the received data are calculated, if the HCU judges that the duration time of the communication fault is less than T1, P'<bat_chg>and P'<bat_dchg> after the communication fault are calculated by linear table look-up difference values, and the battery data processing module of the HCU transfers the corresponding data to a power distribution and battery protection control module of the HCU for execution; and otherwise, the HCU controls P'<bat_chg>, P'<bat_dchg> and P'<bat_actl> to reduce to a certain value, and the hybrid vehicle enters into a battery zero power mode for operation. The communication fault judgment and treatment method of the battery management system of the hybrid electric vehicle is simple and feasible and higher in safety.

Description

technical field [0001] The invention relates to a fault judgment and processing method, in particular to a communication fault judgment and processing method of a battery management system of a hybrid electric vehicle. Background technique [0002] Energy and the environment are important issues facing the world today. Hybrid vehicles use various forms of energy to jointly drive the vehicle, which can effectively achieve the effect of energy saving and emission reduction. During the working process of a hybrid electric vehicle, the vehicle controller is responsible for reasonably allocating the power used according to the driving demand and the state of the battery, motor and engine and other components. The battery management system is responsible for calculating the battery state of charge SOC (State Of Charge), charging and discharging power Battery data such as limit value and actual power play an important role in the torque control, power distribution and energy manage...

AI Technical Summary

Problems solved by technology

The data transmission between the vehicle controller and the battery management system is through CAN communication. During the driving process of the vehicle, the battery management system may have a CAN communication failure, so that the vehicle controller cannot normally receive real-time data from the battery management system. Signal

When the vehicle controller cannot normally receive the real-time data of the battery management system, that is, the battery management system has a communication failure, the existing method is: the vehicle controller still keeps the previously received battery data unchanged and continues to perform power allocation, etc. Until the communication of the battery management system returns to normal or the power is turned off after parking, such an approach will affect the safe driving performance of the vehicle and pose certain hidden dangers to the safety of drivers and passengers

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