Research On Vehicle Electro-hydraulic Suspension’s Performance Using Active Anti-roll Control

Suspension system,as an important part of driving and riding comfort,is also related to vehicle safety.Because of the high center of gravity,commercial vehicles often roll over at high speed.The anti-roll performance of vehicle can be improved by active suspension.However,the active suspension is seldom used in anti-roll control because of its limited control range,high energy consumption and high cost.In order to solve the above problems,a vehicle electro-hydraulic suspension is proposed in this article,which has the function of energy recovery,and can also play a very good control effect when the vehicle roll angle is large or near rollover.This article focuses on the topic " research on vehicle electro-hydraulic suspension’s performance using active anti-roll control ",designs active energy feed mode and active anti-roll mode of vehicle electro-hydraulic suspension,establishes simulation models of energy feed mode and active anti-roll mode,designs active anti-roll control strategy,and carries out simulation verification.The main contents of this article are as follows:Firstly,around the topic of this article,consult the relevant literature at home and abroad,analyze the research status at home and abroad and the research background and significance of this topic.The current research status of key technologies such as energy feeding suspension,active suspension and active anti-roll control system involved in the active anti-roll control of automobile electro-hydraulic suspension are reviewed.The advantages and disadvantages of the current vehicle anti-roll control suspension system are analyzed,and the main research content of the thesis is proposed.Secondly,an active anti-roll control system for automobile electro-hydraulic suspension is proposed.The working principle of the energy feed mode and the active anti-roll control system is explained,and the mathematical model of the hydraulic motor,hydraulic rectifier bridge,high-voltage accumulator,and constant current control circuit is built.The factors affecting the external characteristics of the shock absorber are analyzed to provide theoretical support for the model construction of the energy feed mode and the active anti-roll control system described later.Thirdly,the seven-degree-of-freedom vehicle dynamics model and tire model of the entire vehicle are built,and a single-wheel road surface excitation model is established through the white noise method.Through the left and right correlation and time delay,the left and right wheel road excitation model and the front and rear wheel road excitation model are built respectively,and the four-wheel input road excitation model is obtained after integration.Fourthly,a simulation model of the energy-feeding mode of the vehicle electrohydraulic suspension was built and simulated.Through simulation,the ride comfort of the vehicle equipped with electro-hydraulic suspension under random road input and sinusoidal excitation road input is studied.The simulation results show that a vehicle equipped with an electro-hydraulic suspension can improve the ride comfort of the vehicle.A simulation analysis of the energy-feeding characteristics of a car equipped with an electro-hydraulic suspension under random road input and sinusoidal excitation road input is carried out.The simulation results show that the electro-hydraulic suspension has a good prospect in energy recovery.Fifthly,the fuzzy PID control strategy and roll moment distribution scheme of the active anti-roll mode of the electro-hydraulic suspension,and the logic threshold control strategy of the actuator in the active anti-roll mode are designed.Through MATLAB/Simulink,Truck Sim and AMESim simulation software,associated simulation platform for the control strategy of the electro-hydraulic suspension active anti-roll mode is built.Under different working conditions,the active anti-roll mode control strategy of electro-hydraulic suspension is simulated.The simulation results show that the active anti-roll mode control strategy can improve the vehicle stability,and has a good control effect in the high-speed emergency obstacle avoidance,and can prevent the vehicle rollover to a large extent,and provide the maximum guarantee for the life safety of the driver.