Full-electric-vehicle starting shaking control method based on whole-vehicle simulation model

Abstract

The invention relates to a full-electric-vehicle starting shaking control method based on a whole-vehicle simulation model. The full-electric-vehicle starting shaking control method comprises the steps that A, a whole-vehicle multi-body dynamic model of a full electric vehicle is built, and all transmission paths of starting shaking are obtained; B, a starting shaking motivated transmission path is determined, and the built whole-vehicle multi-body dynamic model is utilized for simulating a starting shaking phenomenon to determine the contribution of all the transmission paths to starting shaking; and C, the torsional vibration active control based on the feed-forward and feedback control is adopted in the starting shaking motivated transmission path, meanwhile, mounting suspension systems based on the active control are sequentially adopted in the other transmission paths according to the magnitude of the contribution to achieve passive control, and starting shaking is reduced. Compared with the prior art, the suspension systems and a transmission system are comprehensively considered, and the whole-vehicle shaking characteristics of the electric vehicle are reflected wholly.

Description

technical field [0001] The invention relates to a pure electric vehicle control technology, in particular to a pure electric vehicle starting vibration control method based on a complete vehicle simulation model. Background technique [0002] The motor-reducer / differential drive system is one of the typical integrated drive systems of electric vehicles, which has the characteristics of high efficiency and integration. The motor and the reducer of the motor-reducer / differential drive system are directly coupled. When the electric vehicle accelerates from the start or when the power transmission system is subjected to disturbance torque, the transmission system has the vibration of the natural frequency of torsional vibration, which is manifested as the vibration of the whole vehicle. Low frequency large fluctuations in longitudinal acceleration. This chattering phenomenon is called "surge" by foreign scholars, and the vibration frequency is mostly the first-order natural tor...

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Problems solved by technology

[0003] Existing simulation and active-passive control methods only consider the suspension system or the transmission system, which cannot reflect the vehicle vibration characteristics of the electric vehicle as a whole; the existing technology does not consider the internal rotor-gear system transmission relationship of the powertrain, which is too simplified ;In the transmission system of the prior art, only the elasticity of the tire is often considered, and the half shaft is considered as a rigid system. This kind of method is suitable for traditional internal combustion engine vehicles, but for electric vehicles with fast starting performance, it is difficult to reflect the impact of the motor on the transmission system torsional action

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