| The research of automobile energy recovery system has become the focus of scientific research,especially for the energy recovery of suspension system.In the process of driving,the damper consumes a lot of energy.How to reduce energy consumption and realize the energy recovery of suspension vibration is the key scientific problem.In the study of energy regenerative suspension,there is little research on hydraulic energy regenerative damper,but hydraulic energy still has great application space.For the energy regenerative suspension,the effective control strategy is needed to realize the vehicle vibration reduction and energy recovery.Therefore,this paper takes the hydraulic energy regenerative damper as the research object,its exterior characteristic as an important part of the automobile suspension and the ride comfort of the suspension is analyzed,the energy regenerative effect as the power recovery device is analyzed at the same time.Firstly,based on the Harvard H6 rear damper as the traditional damper prototype,the principle of hydraulic energy regenerative damper is designed.The hydraulic energy regenerative damper only recovers energy in the compression stroke,so the model of the recovery valve,the compensation valve and the flow valve is basically the same as the traditional damper,only the compression valve is changed.According to the principle and structure,the damping characteristic theory model of the damper is established.The simulation model of hydraulic energy regenerative damper is built by AMESim,the damping force in 0.52m/s of velocity amplitude of piston is analyzed.The performance and speed characteristics of the energy regenerative damper are in accordance with the requirements by comparing and analyzing the simulation results,and the feasibility of the energy recovery is proved by the curve of feeding power and feeding efficiency.In the sine wave excitation of 3.31 Hz,the feeding power root mean square value is 6.08 W,and the greater the velocity of the damper,the feeding power and feeding efficiency are also greater.In order to analyze the influence of the hydraulic energy regenerative damper after loading on the vehicle ride comfort and the feedback effect under the actual road surface excitation,the simulation model of the energy regenerative suspension is built and combined with the pavement excitation model built in Simulink.The simulation results show that the mean square root of the vertical acceleration,tire dynamic displacement and suspension dynamic deflection are not more than 5% compared with the traditional suspension.The feedback effect of the energy regenerative suspension under different speed and road conditions is analyzed.In the vehicle speed of 100km/h and B-level road,the feeding power root mean square value is 35.65 W.In order to optimize ride comfort and regenerative effect of the energy regenerative suspension,a hybrid control strategy to balance the two characteristics is designed,the optimal control strategy is adopted in comfort,and the regenerative performance of the suspension is impro ved by controlling the compression valve on the basis of satisfying the damping performance.Through the hybrid control of the energy regenerative suspension,the square root value of vertical acceleration of the vehicle body is obviously reduced,and the square root value and peak value of the energy regenerative power increases obviously.Therefore,the hybrid control strategy can better balance the ride comfort and energy regenerative characteristics of the suspension,and meet the expected requirements.Finally,the preparation of the damper bench experiment is carried out,the solid model of the energy regenerative damper is established,the actual parameters such as the compression valve and the accumulator are selected based on the parameter set in the simulation process,and the principle diagram of the experimental platform is built in AMESim. |
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