Torque distribution method and system for hybrid electric vehicle

Abstract

The invention provides a torque distribution method and system for a hybrid electric vehicle, and relates to the technical field of new energy vehicles. The torque distribution method for the hybrid electric vehicle comprises the steps that after it is detected that the switching condition of a parallel power-assisted mode is met, the first reference torque of an engine is determined according to a first efficiency curve of the power-assisted mode of the engine, and the first reference torque of a driving motor is determined according to the difference value between the first reference torque of the engine and the torque required by a driver. If the driving motor is in the efficient working interval, the target output torque is controlled to be equal to the torque value; and if the driving motor is not in the efficient working interval, updating the torque value according to a preset torque threshold of the driving motor, and controlling the target output torque to be equal to the updated torque value. By means of the scheme, the engine and the driving motor can be located in a high-efficiency interval at the same time, the energy loss of an electric drive system is reduced while the dynamic property of the whole vehicle is guaranteed, and the economical efficiency of the whole vehicle is improved.

Description

【Technical field】 [0001] The present application relates to the technical field of new energy vehicles, in particular to a torque distribution method and system for a hybrid electric vehicle. 【Background technique】 [0002] Hybrid electric vehicles have multiple drive modes, and the parallel power assist mode is one of them. In the parallel power assist mode, the engine and the drive motor are simultaneously driven as power sources. [0003] At present, the torque distribution method in the parallel power assist mode usually only considers to make the output torque of the engine fall in the high efficiency range, but does not consider the working efficiency of the driving motor. Therefore, the current method may increase the energy loss of the electric drive system, resulting in increased power consumption, which is not conducive to improving the economy of the vehicle. 【Content of invention】 [0004] The embodiment of the present application provides a hybrid electric v...

AI Technical Summary

Problems solved by technology

[0003] At present, the torque distribution method in the parallel power assist mode usually only considers to make the output torque of the engine fall in the high efficiency range, but does not consider the working efficiency of the drive motor

Therefore, the current method may increase the energy loss of the electric drive system, resulting in increased power consumption, which is not conducive to improving the economy of the vehicle

Images