A study of hybrid propulsion system on forklift trucks

This paper discusses the hybrid systems used to power forklift trucks and presents an effective hybrid propulsion system. There are many advantages to applying the hybrid system to engine forklifts: dynamic operating patterns, speed, and torque. The engine forklift is tested to investigate the request torque and speed pattern at the VDI cycle, and the speed pattern of the forklift is demonstrated by comparing it with the Manhattan Bus cycle and the FTP72 cycle. The hybrid propulsion system is suggested to improve fuel economy preserving the drive ability and grade ability of engine forklift. Lastly, the simulation results of this hybrid configuration are shown, and the improvement factors of fuel economy are briefly demonstrated.