Hydraulic Simulator for High Pressure Fuel Pump

Abstract

The hydraulic simulator was proposed for designing the high-pressure fuel pump of direct injection gasoline engine. Currently a single-plunger pump is the major trend for high-pressure fuel pump. The advantage of single-plunger pump is simple structure and small size. However, this type of pump has a demerit of large pressure pulsation. Therefore, adjusting the layout of fuel-pipe is the crucial process for removing the pressure pulsation. In addition, fuel flow rate should be improved at high engine speed, and steady flow should be achieved by flow-rate control. Our newly developed hydraulic simulator can evaluate dynamic characteristics of total fuel supply system, which consists of a pump, pipe, injector, etc. The simulation results of the hydraulic simulator coincide with experiment results well. As a result, the improvement of the development speed can be expected with this simulator.