가변 제어를 위한 병렬 배치식 엔진 오일펌프의 유동 특성 해석 평가

Conventional mechanical engine oil pump is driven by engine power via belt mechanism, whose discharge oil flow increases linearly with rotating speed. This causes engine power loss because the mechanical oil pump supplies more excessive oil flow than required on the various engine speeds and temperature conditions. Automotive manufacturing companies are developing electric oil pumps to control the oil flow rate variably in the engine operation regions. However, on the low temperature conditions engine oil gets more viscous and requires more driving torque, moreover, the motor to drive the electric oil pump is required to have larger capacity and size. The solution to make up these defect is technique of parallel engine oil pumps consists of an electric pump and a reduced mechanical pump. This study aimed to introduce the technology of parallel engine oil pumps and to analysis hydraulic performance of parallel engine oil pumps on the various operating conditions by computational fluid dynamics.