The Design And Simulation Of Electro-hydraulic Absorber Of Heavy Commercial Vehicle

Vehicle shock absorber is an important device to connect body and wheel,which is to dissipate vertical vibration energy between vehicle bod y and wheel,so as to keep vehicle running stability and compliance.The traditional hydraulic shock absorber dissipate heat energy of oil into air t hrough heat conduction.This part of heat energy is not only wasted,but also causes the life of shock absorber to decrease.In order to improve th e economy of vehicle,the concept of electro-hydraulic energy feedback su spension is introduced.The electro-hydraulic energy supply suspension can be transformed into electrical energy by external hydraulic motor and ge nerator,which can provide electric energy for automotive electrical applian ces.Heavy duty commercial vehicle has complex driving conditions and b ad road conditions.Driving for a long time can easily affect the driver’s health,while the lower part of the cab shock absorber is an important pa rt of suspension design.Considering the fuel economy and the service life of shock absorber,the energy recovery potential of shock absorber of heavy commercial vehicle is verified,and the prototype test of electro-hydraulic energy feedback suspension is carried out in this paper.The main contents of this paper are as follows:First,the random road mathematical model is built in Simulink to simulate the real road surface,and the simulation test is done.The energy recovery power of each road surface is calculated,and the factors affecting the energy recovery are analyzed.At the same time,combined with a commercial vehicle,road test is conducted to verify the effectiveness of the simulation model,and further analyze the influence of road level and vehicle speed on the energy dissipation of commercial vehicle suspension.The simulation test and road test show that the heavy commercial vehicle suspension has high energy potential.The road level and speed are the main factors that affect the energy recovery,while the road level has a great influence on the dissipation power,and the speed has little influence on the dissipation power.Secondly,the implementation of components,hydraulic motor,hydraulic accumulator,one-way valve,hydraulic piping,generator and battery are analyzed and the theory of modeling and Simulation of electric hydraulic energy regenerative suspension;and establishes the simulation model of AMESim hydraulic energy regenerative suspension,the working characteristics of the main components of the model.Provide the basis for the subsequent selection of prototype,and verified the rationality of the electro-hydraulic energy regenerative suspension;under simulated conditions,the reduced displacement hydraulic motor,energy efficiency can be improved;through the simulation,analysis of the energy storage device,charging pressure and volume pressure fluctuation on the system in which the accumulator inflation pressure fluctuation of the system and the static pressure of the greatest impact,an important effect on the stability of the system,storage volume is the pressure fluctuation has less influence on system.Finally,the AMESim simulation software to establish hydraulic energy regenerative suspension simulation model based on the principle,design and build a prototype,the prototype includes hydraulic cylinders,hydraulic motor,generator,accumulator,one-way valve,intelligent diffusion silicon pressure transmitter,turbine flowmeter,electronic load and other key components.Through the actual work of the test bench,we have a detailed understanding of the working characteristics of the energy feedback suspension,and optimize the design of the simulation model according to the existing problems in the test.By using the existing electronic load,we design the control circuit by ourselves,so that we can accurately measure the test data,find out the problems in the experiment and solve the problems quickly.