Electronically controlled hydraulic power steering system and multi-objective optimization method based on system

Abstract

The invention relates to an electronically controlled hydraulic power steering system and a multi-objective optimization method based on the system. The electronically controlled hydraulic power steering system comprises a steering mechanical unit, a steering valve opening degree adjusting unit, an oil pump adjusting unit and an electronic control unit (ECU). The problems that in a traditional electronically controlled hydraulic power steering system, steering assistance power can be changed only by changing the rotating speed of an oil pump drive motor, and the opening degree of a steering valve can be linearly adjusted only according to the corner of a steering wheel are solved. Meanwhile, multi-objective optimization is carried out on the electronically controlled hydraulic power steering system, steering road feelings, steering sensitivity and energy consumption are taken as objectives, based on a modified Memetic intelligence algorithm, optimization design is carried out on mechanical parameters and hydraulic system parameters of the electronically controlled hydraulic power steering system, and therefore the system has the good steering road feelings and steering sensitivity with smaller energy consumption.

Description

technical field [0001] The invention relates to the field of automobile electronically controlled hydraulic steering systems, in particular to an electronically controlled hydraulic power steering system and a multi-objective optimization method based on the system. Background technique [0002] The electronically controlled hydraulic power steering system is driven by an electric motor, and the vehicle speed is monitored by a vehicle speed sensor. After obtaining the data, the electronic control unit ECU changes the oil pressure by controlling the opening degree of the steering control valve and the speed of the vane pump driving motor to realize the steering power. A new type of automotive power steering system that can be adjusted in size is currently widely used in automotive power steering. Compared with the traditional hydraulic power steering system, the electronically controlled hydraulic power steering system has the advantages of better handling feeling and dynamic...

AI Technical Summary

Problems solved by technology

[0003] However, in the existing research on the electronically controlled hydraulic power steering system, on the one hand, the motor speed can only be determined according to the vehicle speed and steering wheel torque, and then the power assist torque is controlled by controlling the speed of the motor. The degree can only be adjusted linearly depending on the angle of the steering wheel, which is not suitable for meeting the requirements of making the energy consumption of the car steering as small as possible under multiple working conditions, and the system structure has a large degree of improvement in reducing energy consumption; on the other hand , the current research on the optimal design of the electronically controlled hydraulic power steering system cannot comprehensively consider the energy consumption of the system during the steering process of the car, and at the same time take into account the driver's steering experience

At present, there is no public report on the multi-objective optimization design of mechanical system parameters and hydraulic pump parameters, so that the steering system consumes less energy and ensures the driver to obtain good steering stability and steering feel.

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