Energy management method and system for hybrid vehicle

Abstract

The invention discloses an energy management method and system for a hybrid vehicle. The energy management method comprises the steps that a driver target torque demand m is calculated according to an accelerator pedal opening degree and a vehicle speed; maximum motor charging torque x which can be distributed by a vehicle power system is obtained according to the maximum discharge capacity of a battery pack and the maximum charging capability of a motor; a plurality of torque distribution schemes are generated according to the driver target torque demand m and the maximum motor charging torque x; an equivalent fuel consumption rate Bi of the multiple torque distribution schemes is calculated, wherein i=1, ..., n; and a torque distribution scheme corresponding to the equivalent fuel consumption rate minimum value B0 is determined to be a target torque distribution scheme in the hybrid mode according to the calculation result. According to the energy management method and system, the efficiency of an engine, the motor and the battery pack is comprehensively considered, and the engine torque distribution and the motor torque distribution are timely adjusted according to the driver torque demand, so that the equivalent fuel consumption of a vehicle is the lowest and the fuel saving effect is more obvious.

Description

technical field [0001] The invention relates to the technical field of hybrid vehicles, in particular to an energy management method and system for hybrid vehicles. Background technique [0002] Energy management strategy is the core technology of hybrid electric vehicles and the key to realize vehicle fuel economy and clean environmental protection. [0003] At present, the energy management strategy based on certain rules is relatively common. The main idea of ​​this strategy is to comprehensively consider the driver's target torque, engine speed, battery state of charge and high-voltage accessory consumption through the theory and experience of engineers, and refer to the MAP table of engine efficiency. , adjust the charging torque of the motor, thereby shifting the operating point of the engine, so that the engine can work as much as possible in the high efficiency range of the efficiency map. The rule-based energy management strategy is characterized by simple control ...

AI Technical Summary

Problems solved by technology

The rule-based energy management strategy is characterized by simple control and easy implementation, but it needs to rely on experience and the energy efficiency Map of the engine bench to formulate rules, which is difficult to adapt to various actual working conditions and dynamic changing requirements, and cannot achieve optimal control. Specifically reflected in:

[0004] 1. This solution is only suitable for ensuring that the engine runs in the high-efficiency zone under specific working conditions, and cannot guarantee that it can work in the high-efficiency zone under all working conditions;

[0005] 2. This scheme only considers the engine running in the high-efficiency zone, and there is no way to comprehensively consider the efficiency of the motor and the charging and discharging efficiency of the battery pack, and it is impossible to achieve the optimal overall efficiency

Images