Abstract:

In order to reduce the energy consumption of an electric forklift, a new hydraulic lifting system was proposed, which was based on a combination of the technologies of a VVVF control and hydraulic pressure accumulator. The energy consumption of the electric forklift hydraulic lifting system with pressure accumulators and the one of VVVF controlled electric forklift hydraulic lifting system without pressure accumulators were tested under different load working conditions. The results showed that the latter system has higher energy efficiency and remarkably saves energy  compared with the former. The maximum energy saving rate of the latter system can reach 20.35％, and it has  promising value in  engineering applications.

Key words: energy saving, pressure accumulators, energy consumption, hydraulic lifting system, electric forklift