Daimlerchrysler Corporation

Daniel B Diebel

Michael J Prucka

James W Yip

Gregory L Ohl

Yi Cheng

Kerry D Franks

Paul R Arlauskas

A method for characterizing an air flow target within an internal combustion engine. The method includes determining an air mass flow rate target, determining an engine speed term, and processing these terms to obtain an air flow target. The air flow target can be used as an input for vehicle controllers including those for controlling pressurized induction systems.

Air flow target determination

A method for characterizing an air mass flow rate target within an internal combustion engine. The method includes determining a reference air mass flow rate term, determining a predicted compressibility term, and processing these terms to determine an air mass flow rate target. The air mass flow rate term can be used as an input for vehicle controllers including those for controlling pressurized induction systems.

Air mass flow rate determination

A method for controlling the idle of an engine includes the step of determining a proportional airflow term by monitoring the difference between an engine idle speed and a target idle speed. In addition, an integral airflow term is determined. The method further includes the steps of determining a derivative airflow term by monitoring a rate of change of the engine idle speed and defining a limited derivative airflow term bounded by an upper limit and a lower limit. A total proportional, integral, derivative airflow is determined by summing the proportional airflow term, the integral airflow term and the limited derivative airflow term. The total airflow is then delivered to an engine control system.

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Ypsilanti, MI, United States of America

Daniel B Diebel