Technical Paper
D.I. Diesel Engine In-Cylinder Pressure Data Analysis Under T.D.C. Setting Error
1993-03-01
930595
In-cylinder pressure time history is usually measured in order to calculate both indicated mean effective pressure, as a global engine performance index, and the rate of heat release, as a quantitative information about combustion progress. Generally such information is readily provided by acquisition systems in terms of heat release rate, which is computed by means of simple inverse models based on first law of thermodynamics. Nevertheless attention must be paid to any measurement uncertainty connected to pressure cycle relief which directly results into inaccurate heat release analysis. As far as i.m.e.p. evaluation is concerned, a wrong adjustment of T.D.C. reference position, leading to incorrect pressure-crank angle phasing, had been recognized as the major error source.