연비 향상을 위한 가변 용량 베인펌프 유동 해석 기술
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Variable valve actuation has become a very popular feature in today’s engines. With many of these systems being hydraulically actuated, the engine lubrication system requires enhancement to support their function. To expand the system’s operational range with respect to speed and temperature, a traditional solution has been to increase oil pressure by increasing pump displacement. To better optimize the system, a variable displacement vane pump has been adapted to the engine lubrication system. A pivoting outer ring design is employed that is able to vary the pump’s displacement as a function of pump regulating oil pressure which in-turn provides a net reduction in its drive torque. This paper discusses the CFD (Computational Fluid Dynamics) method by developing a dynamic force balanced model for variable displacement vane pump and also the 1-D detailed VDVP model integrating a lubrication circuit to analyze the pump power consumption over driving cycle mode.
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