Method for selecting and switching working points of range extender

Abstract

The invention provides a method for selecting and switching working points of a range extender, which belongs to the field of range extender control. The method comprises the steps of establishing a universal characteristic diagram of the range extender comprising a plurality of range extender parameter data; establishing a corresponding relation table between each target optimization parameter and the range extender power, the range extender rotating speed and the vehicle speed, wherein the target optimization parameters comprise range extender noise and range extender oil consumption; determining a corresponding target optimization parameter according to the vehicle speed and / or the power demand of the range extender; searching a plurality of corresponding range extender rotating speedsin a corresponding relation table corresponding to the target optimization parameter to obtain a plurality of pre-selected working points expressed by range extender power and the range extender rotating speed; determining priorities of the range extender parameters after the target optimization parameters is removed according to the vehicle speed and / or the range extender power; comparing range extender parameters corresponding to the plurality of pre-selected working points in the universal characteristic diagram; and selecting an optimized working point of the range extender according to the priorities and the comparison result. According to the invention, a proper working point can be accurately selected.

Description

technical field [0001] The invention belongs to the field of range extender control, in particular to a method for selecting and switching working points of a range extender. Background technique [0002] A range-extended electric vehicle is a pure electric drive vehicle that reduces the power of the power battery and adds a range extender system on the basis of a pure electric vehicle. Range extenders generally have single-point, multi-point and linear control modes. Regardless of the mode, the selection of the working point of the range extender is mainly based on the pursuit of low fuel consumption, and the working point or working curve of the range extender is in the high-efficiency zone. For the range extender with multi-point control, it only operates at one of the selected multiple high-efficiency operating points under stable conditions. With the continuous change of vehicle power demand and power battery SOC value, the range extender operates at different Switch ...

AI Technical Summary

Problems solved by technology

[0004] The vibration and noise of the range extender mainly comes from the engine, and there is a certain nonlinear positive correlation with the engine speed. The higher the speed, the more severe the vibration and noise, especially when the vehicle is running at low speed and accelerating; The efficiency of the throttle is low, the emission is poor, and the speed has a greater influence on the vibration and noise than the torque

[0005] The current published patents and papers on the selection strategy of the operating point of the range extender only generally mention that the speed of the range extender should be related to the vehicle speed. At present, the selection of the operating point of the range extender mainly pursues low fuel consumption, and lacks consideration of emissions, NVH and vehicle speed. and other factors, resulting in the selected working point of the range extender is not rigorous and reasonable

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