Control method for improving noise, vibration and harshness (NVH) performance of extended-range electric vehicle

Abstract

The invention discloses a control method for improving noise, vibration and harshness (NVH) performance of an extended-range electric vehicle. The control method comprises the processes that initialization is conducted; the current vehicle working mode is judged; under the different working modes, a range extender is started according to the set starting condition; or according to the set startingcondition, the range extender is automatically started. By adopting the technical scheme, a vehicle control unit (VCU) controls starting and stopping of the extended-range electric vehicle accordingto vehicle speeds and SOC values; under the condition that the vehicle requirements are met, the situation that the range extender is not started at the low speed and the high SOC value is met to thegreatest extent; and by optimizing and sacrificing part of economical efficiency, working points of a range extender system all work at the point with the good NVH performance, finally, the situationsthat the range extender system is not operated when the vehicle operates at the low speed, an engine used for the range extender operates at the economical working point when the vehicle operates atthe medium speed, and the range extender system operates at the medium-high speed working point when the vehicle operates at the high speed are achieved, the requirement of the driving comfort of a driver is met, and the NVH performance of the vehicle is improved.

Description

technical field [0001] The invention belongs to the technical field of new energy vehicles and relates to the application technology of range-extended electric vehicles. More specifically, the present invention relates to a control method for improving the NVH performance of an extended-range electric vehicle. Background technique [0002] As a representative of new energy vehicles, the prospect of pure electric vehicles is widely optimistic. However, due to the current immature battery technology, its high cost, low capacity density, short mileage, and imperfect charging facilities, pure electric vehicles Cars are currently only used for short-distance urban transport. [0003] In order to effectively solve the problems existing in pure electric vehicles, range-extended electric vehicles have emerged as the times require, and range-extended electric vehicles are equipped with engines on electric vehicles. However, the NVH performance of pure electric vehicles is significa...

AI Technical Summary

Problems solved by technology

However, the NVH performance of pure electric vehicles is significantly better than that of gasoline vehicles, while the range-extended electric vehicle is equipped with an engine on the electric vehicle, resulting in poor NVH performance of the extended-range electric vehicle

[0004] At present, the control strategy of extended-range electric vehicles is mainly to meet the power demand of the whole vehicle, and seldom can take into account the NVH performance

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