An electro-hydraulic active steering system and its multidisciplinary optimization method

Abstract

The invention discloses an electro-hydraulic active steering system and a multidisciplinary optimization method thereof. The system comprises a mechanical transmission module, an electric power assisting module, a hydraulic variable transmission module and a control module, an ECU (electronic control unit) outputs signals to control a power assisting motor to output torque, system assistance is executed by a decelerating mechanism mounted on a steering shaft, the ECU further outputs signals to control working of a hydraulic pump driving motor and a proportional reversing valve, oil pressure oftwo sides of a steering drag link hydraulic cylinder piston is changed, so that rotation angles of front wheels are changed. The invention further provides a multidisciplinary optimization method according to the system. Complex coupling relationships among a plurality of disciplines such as automobile dynamics, structural light weight, vibration and noise and energy consumption are comprehensively considered, multidisciplinary optimization of key parameters of the system is performed, overall optimization calculated amount of the system is reduced, the search capability of an optimal solution is improved, the convergence rate of the optimal solution is increased, and design cycle is shortened.

Description

technical field [0001] The invention belongs to the technical field of automobile steering systems, and specifically refers to an electro-hydraulic active steering system and a multidisciplinary optimization method thereof. Background technique [0002] With the vigorous development of the automobile industry, the automobile steering system has also developed from mechanical to hydraulic, electronic control, and intelligent. Active steering system is an emerging technology that improves vehicle stability and driver control by changing the steering ratio at different vehicle speeds. At present, there are mainly two ways to realize the variable transmission ratio function. The first is to design a purely mechanical structure composed of a special rack, which is adopted by Mercedes-Benz; the second is to use electronic systems and The combination of a set of planetary gear structures can not only change the steering ratio freely, but also perform steering intervention to contr...

AI Technical Summary

Problems solved by technology

The electro-hydraulic active steering system of the present invention can adjust the steering transmission ratio under different working conditions, and can perform steering intervention in emergency situations, so that the car maintains driving stability, the driver obtains a better control feeling, and the steering performance reaches the best. At the same time, it also solves the shortcomings of traditional optimization methods such as low design efficiency and difficulty in fully considering the coupling between multiple disciplines, and effectively optimizes the key parameters of the provided electro-hydraulic active steering system

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