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Cylinder Pressure based Real-Time IMEP Estimation of Diesel Engines  

Kim, Do-Hwa (Gasoline Engine R&D Team, Hyundai-KIA Motor Company)
Oh, Byoung-Gul (Department of Automotive Engineering, Graduate School, Hanyang University)
Ok, Seung-Suk (Department of Automotive Engineering, Graduate School, Hanyang University)
Lee, Kang-Yoon (Automotive Control & Electronics Laboratory, Hanyang University)
SunWoo, Myoung-Ho (Department of Automotive Engineering, Hanyang University)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.17, no.2, 2009 , pp. 118-125 More about this Journal
Abstract
Calculation of indicated mean effective pressure(IMEP) requires high cylinder pressure sampling rate and heavy computational load. Because of that, it is difficult to implement in a conventional electronic control unit. In this paper, a cylinder pressure based real-time IMEP estimation method is proposed for controller implementation. Crank angle at 10-bar difference pressure($CA_{DP10}$) and cylinder pressure difference between $60^{\circ}$ ATDC and $60^{\circ}$ BTDC($DP_{deg}$) are used for IMEP estimation. These pressure variables can represent effectively start of combustion(SOC) and fuel injection quantity respectively. The proposed IMEP estimation method is validated by transient engine operation using a common-rail direct injection diesel engine.
Keywords
Cylinder pressure; Indicated mean effective pressure; Estimation; Real-time; CRDI;
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