Energy control strategy research of parallel hydraulic hybrid vehicle

The configuration of the parallel hydraulic hybrid vehicle (PHHV) is introduced, and the selection of hydraulic regeneration system is discussed. To improve the performance of the vehicle through coordinating the components of the PHHV, an energy control strategy based on logic threshold is designed by considering the work characteristics of the components of the PHHV and taking the efficiency curve of the engine and the hydraulic pump/motor as the main basis. The energy distribution of the PHHV is controlled instantly, and the different operating modes of the PHHV as well as their dynamically switching are implemented. The effects of the parameters such as power threshold, pressurization power to the energy control strategy are analyzed, and the set points of the optimum parameters from the viewpoint of optimum energy-saving efficiency are optimized. The simulation result shows that the energy control strategy based on logic threshold can realize rational switch in different operating modes, and the fuel economy of vehicle is effectively enhanced under the premise of meeting dynamic performance.