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김도화(Dohwa Kim),오병걸(Byoungul Oh),오승석(Seungsuk Ok),이강윤(Kangyoon Lee),선우명호(Myoungho Sunwoo) 한국자동차공학회 2009 한국 자동차공학회논문집 Vol.17 No.2
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<SUB>DP10</SUB>) and cylinder pressure difference between 60° ATDC and 60° BTDC(DP<SUB>deg</SUB>) 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.