Research on the Energy Recovery System of an Electric Controlled Hydro-hybrid Vehicle

The parameter configuration of the energy recovery system affects significantly the braking performance and energy-saving effect of hydro-hybrid vehicles. The working principle of the energy recovery system of an electric controlled hydro-hybrid vehicle was analysed. Based on quarter of the prototype vehicle, the parameters of auxiliary power element (accumulator) and secondary element (hydraulic pump/motor) were analysed theoretically. The test verification was carried out based on the test bench. It was shown that on the premise of satisfying the braking performance, reducing the minimum working pressure of the accumulator was beneficial to the recovery of braking energy. The displacement of the hydraulic pump/motor has a great influence on braking performance and a little effect on the recovery rate of braking energy. Furthermore, the lower the working pressure of the accumulator, the larger the energy density.