흡기 매니폴드 PCV Icing 및 분배 특성 평가

The target of developing engine get to improve the fuel economy and performance. An engine intake manifold is optimized by plenum shape, primary and secondary length, port diameter, mass flow rate in the cylinder chamber, etc. Intake manifold also has safety factor for PCV icing and distribution. If the icing is occurred in vehicle, it may give rise to serious accident caused by trouble of break booster, reduction of speed, etc. It becomes more and more important for base intake manifold distribution. AFIM(Air Fuel Imbalance Monitor) function is expected to be implemented in the year 2014 OBDII. Intake manifold imbalance is due to manifold leak, fuel injector trouble, cam position trouble, etc. This paper describes how to check the PCV icing at vehicle and distribution at engine dynamometer and how to improve PCV icing problem.