자동차용 PCV 밸브의 특성 측정에 대한 연구

다국어 초록 (Multilingual Abstract)

Positive Crankcase Ventilation(PCV) is a plumbing system installed at the intake of internal combustion engines for the feed-back control of blow-by gas from the leakage of piston-cylinder system. The blow-by gas must be regulated in a short time, so the PCV valve should be opened in a certain range of the pressure difference between intake manifold and crank room. For the high pressure difference at the idling and deceleration, the PCV valve is controlled proportional to the production of blow-by gas. However, for the low pressure difference at the full stroke, the ventilation should be closed because the excess blow-by flow can enter the combustion chamber directly through the breather hose. The PCV valve controls the area of throat by using the elasticity of a spring. In this paper, the author constructed a measurement system con cering the characteristics of two types of commercial PCV valves for automobiles. The measured flow rates are plotted to make a new speculation of proper test for products, and compared with theoretical prediction based on compressible fluid dynamics.

목차 (Table of Contents)

• Abstract
• 1. 서론
• 2. 부품 성능 측정에 대한 고찰
• 3. 측정 시스템의 개선
• 4. 결론
• 후기
• 참고문헌