Control strategy for energy recovery system in hybrid forklift

GONG Jun(龚俊)^{1, 2}, HE Qing-hua(何清华)^{1, 2}, ZHANG Da-qing(张大庆)², ZHAO Yu-ming(赵喻明)^1,2, LIU Chang-sheng(刘昌盛)^{1, 2}, TANG Zhong-yong(唐中勇)²

(1. State Key Laboratory of High Performance Complicated Manufacturing,
Central South University, Changsha 410083, China;
2. National Enterprise R&D Center, Sunward Intelligent Equipment Co., Ltd., Changsha 410100, China)

Abstract:After analyzing the working condition of the conventional diesel forklift, an energy recovery system in hybrid forklift is considered and its simulation model is built. Then, the control strategy for the proposed energy recovery system is discussed, which is validated and evaluated by simulation. The simulation results show that the proposed control strategy can achieve balance of the power and keep the state of charge (SOC) of ultra capacitor in a reasonable range, and the fuel consumption can be reduced by about 20.8% compared with the conventional diesel forklift. Finally, the feasibility of the simulation results is experimentally verified based on the lifting energy recovery system.

Key words:hybrid power; forklift truck; energy recovery; control strategy; ultra capacitor