Simulation of a vehicle hydraulic propulsion system

The characteristics of a hybrid hydraulic vehicle driven by the hydraulic common rail propulsion system with a hydraulic free-piston engine and a hydraulic transformer were studied. A mathematical model of the propulsion system was established and a control method of the propulsion system was proposed. Extensive simulation results of hybrid hydraulic vehicles with the hydraulic common rail propulsion system were presented. The hydraulic common rail propulsion system achieved the switch power control and the constant power propulsion. The control method based on the propulsion, break and speed limit requirement was verified. Our results showed that the hydraulic common rail propulsion system gained an ideal acceleration process.