Throttling Loss Energy-Regeneration System Based on Pressure Difference Pump Control for Electric Forklifts

At present, the hydraulic systems of electric forklifts and traditional internal combustion are mostly valve-controlled speed-regulation systems, which have large throttling losses potential energy waste. To further improve energy-saving ability forklifts, forklift’s common working conditions analyzed in this paper. A loss energy-regeneration system based on pressure difference pump control is designed, system’s principle described. Aiming to deal with problem that pump−valve compound speed regulation constant could not realize high controllability saving at same time, a strategy for variable balance proposed. The handle signal positively related target oil cylinder. In low-speed stage, closed-loop actual output torque motor/generator keeps across proportional throttle valve unchanged, adjustment realized by changing opening valve. high-speed area kept unchanged changed achieve speed. Finally, feasibility verified through an AMESim simulation, minimum switching point determined experiments. experiments show efficiency can reach 21.5% under 1 t load. With increase load, be improved.