Gm Global Technolgoy Operations, Inc.

John M Gunselman

Kenneth J Buslepp

James R Yurgil

Douglas E Trombley

An engine control system that regulates operation of an engine includes an intake valve that regulates air intake into a cylinder of the engine and an exhaust valve that regulates exhaust from the cylinder. A control module determines a cylinder volume at intake valve closure and a cylinder volume at intake valve opening and calculates an intake pumping torque based on the cylinder volume at intake valve closure and the cylinder volume at intake valve opening. The control module determines a cylinder volume at exhaust valve closure and a cylinder volume at exhaust valve opening and calculates an exhaust pumping torque based on the cylinder volume at exhaust valve closure and the cylinder volume at exhaust valve opening. The control module calculates a net pumping torque based on the intake pumping torque and the exhaust pumping torque and regulates engine operation based on the net pumping torque.

Dynamic engine pumping work estimation algorithm

An engine exhaust system includes a catalytic converter. An inlet sensor senses a first oxygen level of exhaust gases entering the catalytic converter. An outlet sensor senses a second oxygen level of exhaust gases exiting the catalytic converter. A controller communicates with a fuel system of an engine, the inlet sensor, and the outlet sensor. The controller initiates a rich condition after a fuel cut-off period and calculates a mass of oxygen released by the catalytic converter based on a mass air flow into the engine. The controller calculates a target oxygen storage capacity (OSC) of the catalytic converter over a target time period.

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Novi, MI, United States of America

John M Gunselman