Composite power supply EPS multi-mode switching method and device based on dynamic switching threshold

Abstract

The invention belongs to the field of automobile steering systems, and particularly relates to a composite power supply EPS multi-mode switching method and device based on a dynamic switching threshold. The composite power supply EPS multi-mode switching method comprises the steps that a fluctuation range of electrical load power of a whole vehicle is obtained statistically, and a variation rangeof critical speed and critical rotation angle is obtained; the real-time power of the electric load of the whole vehicle and the SOC of supercapacitor is taken as the input of a fuzzy controller, thecritical speed and the critical rotation angle are taken as the output of the fuzzy controller, and the fuzzy controller is used for realizing the dynamic adjustment of the multi-mode switching threshold, namely, the critical speed and the critical rotation angle; a working mode of the composite power supply EPS system is determined and the corresponding mode switching is carried out to promote the work of a circulating ball steering gear; and the dynamic adjustment process is designed based on the composite power supply EPS multi-mode switching method based on the dynamic switching threshold,the multi-mode switching threshold, namely, critical speed vs and critical rotation angle theta <HS> can be adjusted dynamically in real time to enable the vehicle current to flow efficiently, the intermediate process of energy conversion is reduced, and the energy utilization rate of the whole vehicle is improved.

Description

technical field [0001] The invention belongs to the field of automobile steering systems, and in particular relates to a multi-mode switching method and device for a composite power supply EPS based on a dynamic switching threshold. Background technique [0002] In recent years, Electric Power Steering (EPS) has been widely used in passenger cars and light commercial vehicles due to its advantages of safety, energy saving and environmental protection. , The power supply system of the whole vehicle cannot meet the demand for steering power, thus limiting the application of EPS in the field of heavy commercial vehicles. Therefore, it is of great research value and practical significance to study the new EPS scheme suitable for heavy commercial vehicles and solve the scientific and technical problems in the new scheme. [0003] As a new type of power supply, supercapacitors have the advantages of rapid charge and discharge, high current and rapid discharge, good dynamic perfor...

AI Technical Summary

Problems solved by technology

However, in the existing control methods, once the switching threshold is determined, it is a fixed value and will not be dynamically adjusted according to the energy state of the vehicle, which is not conducive to the rational use of energy to a certain extent, resulting in waste of resources

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