Chrysler Corporation

Daimlerchrysler Corporation

Denise M Kramer

Timothy A Coatesworth

Gregory L Ohl

Michael J Prucka

Eugenio DiValentin

Roger K Vick

A residual ratio factor characterizing the amount of residual exhaust gas left in a selected cylinder at the end of a piston intake stroke is determined from tabular and surface models based on previously gathered dynamometer data from a test vehicle at various engine speeds. The residual ratio factor is then used to calculate the mole fractions of air and residual exhaust gas in the selected cylinder, which, in turn, are used to determine mass airflow at an engine intake port at the end of the intake stroke. The mass airflow can then be used to derive further models for determining an engine operating parameter, such as fuel/air ratio, required for achieving at preselected vehicle operating condition.

Growing community of inventors

Macomb, MI, United States of America

Denise M Kramer