Research for intake and exhaust system parameterization of 2‐cylinder gasoline engine for RE‐EV. (30th March 2018)

• Record Type: Journal Article
• Authors: Jang, Jinyoung; Woo, Youngmin; Jung, Yongjin; Cho, Chongpyo; Kim, Gangchul; Pyo, Youngdug; Han, Myunghoon; Lee, Seungcheol
• Other Names: Nižetić Sandro guestEditor.
• Is Part Of: International journal of energy research. Volume 42:Number 9(2018)
• Page Start: 3007
• Page End: 3016
• Publication Date: 2018-03-30
• Subjects: brake specific fuel consumption (BSFC) -- exhaust manifold -- intake runner length -- intake valve open timing -- optimization -- parameterization -- RE‐EV -- volumetric efficiency; Power resources -- Periodicals; Power (Mechanics) -- Periodicals; Power resources -- Research -- Periodicals; 621.042
• DOI: 10.1002/er.4066
• Languages: English
• ISSNs: 0363-907X

Abstract

Summary: Many research groups have attempted to overcome the short travel distance of electric cars by using RE‐EVs (range extended electric vehicle) with small engine generators for battery charging. Engines for RE‐EVs need to be optimized for maximum power at around medium engine speed or less because a higher engine speed causes higher noise. In this study, basic research about intake and exhaust flow was conducted to find the design point of high power at around medium engine speed. Test parameters are intake valve open (IVO) timing, the shape of the exhaust manifold and the intake runner length for a 0.6‐L naturally aspirated (NA) gasoline engine. The firing order of the test engine is from the first cylinder to the second cylinder and cylinders have 180 o CA (crank angle degree) phasing difference. Test conditions are from 1200 to 6000 rpm at full load operation, 12, 22, and 32 o CA BTDC (before top dead center) of IVO timing, and an exhaust manifold to reduce interference of exhaust gas between the first and second cylinder; there are also 200, 340, and 440 mm length intake runners. The effect of the IVO timing on the engine performance was found not to be significant in this study. The shape of the exhaust manifold and the lengthened intake runners affected the torque and the BSFC (brake specific fuel consumption) and helped to improve the engine performance at around medium engine speed. Abstract : This paper presents the optimal way to improve the engine performance in an RE‐EV engine, which is a 0.6‐L naturally aspirated gasoline engine. For this purpose, the intake valve opening timing, the shape of the exhaust manifold, and the intake runner length were changed. A combination of modified exhaust manifold and intake runner lengthened to 340 mm was the best choice for the RE‐EV (range extended electric vehicle) engine in this study. Since the efficiency of intake and exhaust has a great influence on the maximum output of the gasoline engine, the performance change was conducted by using the intake manifold and the exhaust manifold to optimize the RE‐EV engine operating in the low to medium engine speed conditions. By increasing the intake pipe length and changing the inter‐cylinder pressure interference phenomenon by changing the exhaust manifold shape, it was possible to improve the output and fuel efficiency performance in the middle and low engine speed conditions.