Method for obtaining filter coefficient and torque filter method and system for hybrid electric vehicle

Abstract

The invention provides a method for acquiring filtering coefficient, and a torque filtering method and system for a hybrid power vehicle. The method for acquiring the filtering coefficient includes: acquiring current working condition modes of an engine, a first electric motor and a second electric motor, determining a filtering coefficient of the engine, a filtering coefficient of the first electric motor and a filtering coefficient of the second electric motor according to the current working condition modes of the engine, the first electric motor and the second electric motor; acquiring a larger value from the filtering coefficient of the first electric motor and the filtering coefficient of the second electric motor, comparing the larger value and the filtering coefficient of the engine to acquire a smaller value from the larger value and the filtering coefficient of the engine, and using the smaller value as a final torque filtering coefficient; and finally performing first order inertia filtering according to the final torque filtering coefficient. The final torque filtering coefficient can be determined by compressive consideration of the filtering coefficients of the engine, the first electric motor and the second electric motor in the current working conditions; a current output torque of the whole vehicle can follow the desired torque of a driver timely and accurately, and the demand of a hybrid power automobile for torque filtering can be met.

Description

technical field [0001] The invention relates to the field of control of hybrid electric vehicles, in particular to a method for obtaining filter coefficients and a torque filtering method and system for hybrid electric vehicles. Background technique [0002] A hybrid vehicle refers to a vehicle that is equipped with more than two power sources, such as an engine and an electric motor. Compared with the engine, the electric motor has excellent torque response characteristics, that is, it can quickly and accurately track and respond to the driver's demand torque (ie, the required vehicle output torque). [0003] In a hybrid electric vehicle, the working mode of the engine includes: driving mode and zero torque mode, and the mode when switching between these two modes; the working mode of the electric motor includes: driving mode, power generation mode, brake feedback mode and Zero torque mode, and the mode when any two of these four modes are switched between each other. Hyb...

AI Technical Summary

Problems solved by technology

In the prior art, there is no method for obtaining filter coefficients for filtering that can well adapt to hybrid vehicles with different operating modes, especially when the hybrid vehicle has three power sources, the acquisition in the prior art The method used to filter the filter coefficients does not provide coordinated control of the three power sources

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