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Recently, energy saving is very important because the environmental contamination and the shortage of energy resources have become a major problem in a number of fields including oil hydraulic systems. We previously proposed a pump unit driven by an electric motor with intermittent operation. This pump unit achieves electrical energy saving compared with conventional pump units under a wide range of driving condition. However, construction machines and vehicles mainly use an engine as a power source. In this study, we test the intermittent operation of a pump unit driven by an engine, and we achieve automatic engine restart by means of a hydraulic assist. We research an intermittently operated pump unit driven by a gasoline engine and achieve a saving in energy. In addition, we research the effect of accumulator volume and the stability of the engine restart.

Energy Saving of Oil Hydraulic Pump Unit by Idling Stop Using Accumulator