Design and Energy Regenerative Study on Vehicle Semi-active Suspension with Electro-hydrostatic Actuator

Kou Farong;College of Mechanical Engineering,Xi'an University of Science and Technology;

electro-hydrostatic actuator;;semi-active suspension;;regenerative energy;;optimal control;;energy management;;bench test

In order to effectively realize the damping control and regenerative energy recovery of vehicle suspension,electro-hydrostatic actuator( EHA) technology in the aerospace field was introduced into vehicle suspension system and a kind of vehicle semi-active suspension with EHA was put forward. For the following simulation analysis of suspension performance,2-DOF mechanical model of vehicle semiactive suspension and EHA mathematical model were established. The EHA prototypes were designed and developed for test parameters' identification and regenerative energy recovery. Then,the characteristic tests of the generator and energy regenerative tests of EHA were completed. The optimal control and energy management control strategies of EHA semi-active suspension were designed. The dynamic performances and energy regenerative characteristics of semi-active suspension with EHA were simulated by AMESim and Matlab / Simulink software. The test bench systems for semi-active suspension were developed. Then,the tests of semi-active suspension with EHA were done. The simulation results show that for semi-active suspension with EHA,sprung mass acceleration drops by 23. 97%,suspension dynamic deflection drops by 18. 36%,and tire dynamic load drops by 11. 50%. And the energy regenerative efficiency is 36. 4% under vehicle speed of 30 km / h and C-level road excitation is 67. 4%under amplitude of 0. 05 m and frequency of 4 Hz sinusoidal excitation. The test results show that compared with passive suspension,sprung mass acceleration of semi-active suspension with EHA drops by about 20%. The damping effect of developed semi-active suspension with EHA is obvious.