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연비측정모드에서 디젤엔진 차량에 전자식 진공펌프 적용 시 연비 개선율 분석
김현우(Hyeonwoo Kim),이형채(Hyeongchae Lee),위효성(Hyoseong Wi),박진일(Jinil Park),이종화(Jonghwa Lee) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
The brake booster in a brake system of a diesel engine vehicle is a device has negative-pressure by a vacuum pump. It helps to reduce the brake operating force. In short, it is a brake force increasing device. Negative-pressure is generated by a vacuum pump that is a component consumes the power of engine. There are two kinds of vacuum pumps. One of the vacuum pumps is a mechanical vacuum pump and the other is a electronic vacuum pump. The mechanical vacuum pump operates with engine by belt. So a mechanical vacuum pump operates continuously when engine is operating, regardless of necessary condition. It means that a mechanical vacuum pump consumes continuously the engine power while driving. On the other hand, a electronic vacuum pump operates independently of engine operating. So it can control by supplying voltage. In other words, when negative-pressure is needed, a vacuum pump will operate. It can reduce the unnecessary engine power consumption. So this is of advantage to fuel economy. In this study, compared the application of a electronic vacuum pump and mechanical vacuum pump in a diesel engine vehicle on the FTP-75 mode and confirmed the effect of fuel economy. As a result , the improvement rate of fuel economy using a electronic vacuum pump was 00% compared with the result of using a mechanical vacuum pump.
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