Study On The Simulation And Active Control Of Hydraulic-Electricity Regenerative Suspension

The objective of researching vehicle energy regenerative suspension is to recycle the vibrational energy that dissipated by the traditional shock absorber,and we should ensure the premise that the energy regenerative suspension can realize semi-active or active control.so the characteristic performance of suspension should be better than the traditional passive suspension.We use three indexes-body acceleration, suspension dynamic deflection and the tyres dynamic displacement to evaluate the performance of suspension,which is related to the ride comfort and manipulating stability,the first step is to have a good control of energy regenerative suspension system,then we work on how to increase energy feedback.In the study of the project,the energy regenerative suspension is a mix system of mechanic,electricity and hydraulic,the control method include semi-active and active circumstances.For the semi-active method,we use the reaction force generated by counter electromotive force of generator to control the fluid damping force in hydraulic loop,then it controls the damping force on the piston in shock absorber.the movement between sprung mass and unsprung mass is related to piston moving up and down.In the semi-active control, the energy recovery circuit and motor torque control circuit are integrated together,so on one hand, we should focus on how to design the rectifying and voltage-stabilizing circuit,which can continue the uninterrupted recovery of electric energy, on the other hand,we should integrate the controller into the energy recovery circuit,which have already contained a control strategy.For the active method,we isolate the active power control system and energy recovery circuit,the energy that active control force require can be drawn directly from the energy regenerative suspension in the energy recovery circuit, and it can also be derived from the vehicle battery or other power supply device,we research the degree of energy feedback under the premise of the realization of energy regenerative suspension’s active control.The article is based on this stragedy, so the mainstream of the active suspension control strategies are applied to the liquid electrical energy regenerative suspension,then it uses AMESim and Simulink to carry out co-simulation research about three active control strategies of liquid electrical energy regenerative suspension, including the LQG linear stochastic optimal control. PID control and fuzzy control. First it establishes the liquid electric energy regenerative shock absorber theoretical model, then calculates and selects main simulation model parameters and successfully set the system to carry out co-simulation.Then builds the co-simulation model under three kinds of control strategies,which is based on the1/4vehicle suspension model with two degrees of freedom,it also makes the the servo state liquid electrical energy regenerative suspension model under the same conditions to analysis and comparison with the former results.After the simulation calculation of two kinds of software.it mainly contrast and analysis the three evaluation indexes and energy recovery capability of suspension system. The simulation results show that, after active control,the features of energy regenerative suspension are better than the servo state, but the energy recovery ability is inferior to servo state. The simulation results of the active control about energy regenerative suspension is very useful.In the last,the paper has a overall design of liquid electric energy regenerative shock absorber integrated prototype test bench,that is because the study of control characteristics and energy regenerative performance about liquid electrical energy regenerative suspension requires a large amount of experimental exploration,how to integrate the controller contains the control strategy and the energy recovery circuit into the suspension test platform, there are a lot of hard work to be done.