Abstract:

The optimal structure of the hydraulic hybrid vehicle and its working principle were presented based on the optimization conditions of the accumulator. A mathematical model was built for the instantaneous flow rate of the hydraulic transformer(HT) and the theoretical analyses of the series and parallel accumulator were made with the frequency method. The instantaneous flow rate through the kidney form port of the HT and the flow rate response of the accumulator were numerically simulated under different control angle of the port plate. The results show that the damping effect of the series accumulator to the flow pulsation of the HT is superior to that of the parallel accumulator, regardless of the control angle of the port plate is zero or not.

Key words: vehicle engineering, fluid power transmission and control, hydraulic transformer, accumulator, pulsation analysis