Development of an electrically driven diesel fuel pump for commercial vehicles using HILS

다국어 초록 (Multilingual Abstract)

Common-rail fuel injection systems on modern diesel engines have fuel pumps that are mechanically driven by the crankshaft. Thepumps actually house two pumping elements: a low pressure element and a high pressure element. Part of the fuel compressed by the lowpressure element returns to the tank in the process of maintaining the pressure in the common-rail at adequate levels for injection. Sincethe returning fuel represents pumping energy loss, fuel economy improves if the returned fuel can be reduced by using a properly controlledelectrical fuel pump. As the first step in developing an electrical fuel pump the fuel supply system on a six-liter diesel engine wasmodeled with AMESim to analyze the workload and the fuel feed rate of the injection pump; the results served as the basis for selecting asuitable servo-motor to drive the pump. A motor controller was built using a DSP and a program which controls the common-rail pressureusing a proportional control method based on the target fuel pressure information from the engine ECU. Test equipment was alsofabricated to evaluate the performance of the electrically driven fuel pump. In a simulated vehicle test during the first 200 seconds of theNEDC driving schedule, the electric pump satisfied the fuel pressure and flow demand of the engine, consuming only 48.3% of the energythat an engine-driven pump would require.

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