Electro-hydraulic composite power-assisted steering system optimization method considering modal

Abstract

The invention discloses an electro-hydraulic composite power-assisted steering system optimization method considering modals. The method comprises the following steps: carrying out dynamic modeling on an electro-hydraulic composite power-assisted steering system; carrying out finite element modeling on the structure of the electro-hydraulic composite power-assisted steering system; analyzing the inherent frequency of the steering system and the reaction time of the steering system when a wheel on one side is subjected to transient excitation, and deducing mathematical expressions of steering road feel and steering energy consumption; obtaining and optimizing a structure which has the largest influence on four optimization targets through a contribution degree analysis method, and taking the size as an optimization variable; establishing a mathematical relationship between the inherent frequency of the steering system and the transient excitation reaction time and structural size parameters of the electro-hydraulic composite power-assisted steering system; and obtaining a Pareto solution set, and selecting an optimal compromise solution through an ideal solution similarity preference sorting method. According to the method, the operation performance requirement and the static performance requirement of the steering system are comprehensively considered, and an optimization result with higher precision and higher convergence speed can be obtained.

Description

technical field [0001] The invention belongs to the technical field of vehicle steering, and in particular relates to an optimization method of an electro-hydraulic composite power steering system considering a mode. Background technique [0002] The electro-hydraulic hybrid power steering system has received extensive attention due to its advantages such as clear road feeling, precise power assistance and high degree of electrification. However, its structure is more complicated than that of electric power steering and hydraulic power steering, and its design is more difficult. How to avoid the resonance caused by the vibration of the hydraulic pump, the booster motor and the idle speed of the engine when the hydraulic system is working, and how to reduce the reaction time of the steering system when the wheels are transiently excited has become a problem worthy of attention. At the same time, the current market generally requires the electro-hydraulic power steering syste...

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Problems solved by technology

[0006] The third is the traditional particle swarm optimization adopted by the current main optimization method. Although this algorithm has the advantages of simple principle and fast convergence speed, it also has disadvantages such as poor global search ability and easy to fall into local optimu

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