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Analysis of Cylinder Compression Pressure & Valve Timing by Motoring Current & Crank Signal during Cranking  

Kim, In-Tae (Department of Mechanical Engineering, Graduate School, Kyunghee University)
Park, Kyoung-Suk (Department of Mechanical Engineering, Kyunghee University)
Shim, Beom-Joo (Department of Mechanical Engineering, Graduate School, Kyunghee University)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.19, no.5, 2011 , pp. 45-50 More about this Journal
Abstract
Compression pressure of individual cylinder and valve timing have big influence on combustion pressure, indicated mean effective pressure (IMEP), emission, vibration, combustion noise and many other combustion parameters. Conventional method, however, to check compression pressure uniformity is done by mechanical pressure gage and valve timing is checked manually. This conventional method causes inaccuracy of cylinder pressure measurement because of different cranking speed results from battery status and temperature. Also to check valve timing, related FEAD parts should be disassembled and timing mark should be checked. This study describes and suggests new methodology to measure compression pressure by analysis of start motor current and to check valve timing by cylinder pressure with high accuracy. Results, it is found that detection of bulky as well as small leaky cylinder is possible by cranking motor current analysis and wrong valve timing can be detected by cylinder pressure analysis and cam and crank sensor signal.
Keywords
Compression pressure; Motoring power; Pumping loss; Analysis of current; Motoring current; Valve timing;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
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