Gm Global Technolgoy Operations, Inc.

Melvin R Terechenok, Jr

Sanjeev Manubhai Naik

Douglas R Verner

Joseph J Moon

Kevin Andrew Gady

Jason Thomas Davis

Kurt Alfred Wellenkotter

Scott McLane

A system according to the principles of the present disclosure includes a switching period module and at least one of a valve lift control module and a start-stop control module. The switching period module determines a switching period that elapses as a valve lift actuator of an engine switches between a first valve lift position and a second valve lift position that is different than the first lift position. The switching period begins when a measured position of the valve lift actuator corresponds to the first lift position and the switching period ends when the measured position of the valve lift actuator corresponds to the second lift position. The valve lift control module controls the valve lift actuator based on the switching period. The start-stop control module determines whether to automatically stop the engine based on the switching period.

System and method for determining an oil contamination level of an engine based on a switching period of a valve lift actuator to improve engine startups

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Canton, MI, United States of America

Melvin R Terechenok, Jr