Multi-objective optimization method for electric-hydraulic composite power steering system

Abstract

The invention discloses a novel multi-objective optimization method for an electric-hydraulic composite power steering system. A booster part of the electric-hydraulic composite power steering system consists of an electric booster steering module and a hydraulic booster module, and controlling the of the two booster modules is realized through a coupler, so that the problems that the booster characteristic adjustability of a hydraulic booster system and an electrical-controlled hydraulic booster system, which are used by a conventional large-scaled bus is poor, and when the large-scale bus travels at a middle speed or at a high speed, the steering road feel of the conventional large-scaled bus is poor are solved. Besides, through multi-objective optimizing of the electric-hydraulic composite power steering system, the steering road feel and the steering energy consumption are used as targets, the steering sensitivity is used as a constraint condition, and based on an improved multi-island genetic algorithm which is amended by simulated annealing, so that the selected parameters of the electric-hydraulic composite power steering system are optimally designed, and compared with the optimization result of the multi-island genetic algorithm, the optimized electric-hydraulic composite power steering system can obtain better global convergence, higher convergence rate, better steering road feel and better steering economy.

Description

technical field [0001] The invention relates to the technical field of automobile power steering systems, and specifically refers to a multi-objective optimization method for an electro-hydraulic compound power steering system. Background technique [0002] At present, the power steering systems commonly used in existing automobiles include: hydraulic power steering systems, electronically controlled hydraulic power steering systems and electric power steering systems. Among them, the hydraulic power steering system and the electronically controlled hydraulic power steering system can provide greater power assistance under low-speed operating conditions and reduce the burden on the driver when steering; however, the steering feel is poor under high-speed operating conditions, and there are problems with handling stability. The electric power steering system is composed of a controller, a power assist motor, a steering wheel torque sensor of a reduction mechanism, and a vehic...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the above-mentioned prior art, the object of the present invention is to provide a multi-objective optimization method for the electric-hydraulic hybrid power steering system, so as to solve the problems of the hydraulic power steering system and the electronically controlled hydraulic power steering system in the prior art. The road feeling of the steering is poor, the steering stability is problematic, and the steering economy of large passenger cars is problematic.

Images