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Imep Estimation From Instantaneous Crankshaft Torque Variation
Published May 15, 1990 by Society of Automotive Engineers of Japan in Japan
Event: JSAE Spring Conference
In order to establish the technique for determining the indicated mean effective pressure Pmi from the crankshaft torque of a gasoline- powered engine, various factors causing torque fluctuations were theoretically analyzed. The error factors involved in determining the crankshaft torque and Pmi from angular velocity fluctuation measurements of the flywheel were also examined. As a result, it was found that in the low to medium speed ranges, Pmi could be estimated with an accuracy of over 99% correlation coefficient to the in- cylinder pressure sensor by adequately processing the angular velocity fluctuation data.