Gm Global Technolgoy Operations, Inc.

Scott McLane

Sanjeev Manubhai Naik

Douglas R Verner

Janean Kowalkowski

Joseph J Moon

Kevin Andrew Gady

Jason Thomas Davis

Benjamin Radke

Marek L Wilmanowicz

Kurt Alfred Wellenkotter

Jason J Chung

Melvin R Terechenok, Jr

John David Barta

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

A system and method for initiating an engine after-run state and controlling a nitrogen oxide sensor self-diagnostic tool are provided. The system may include an internal combustion engine, an exhaust system, a selective catalytic reduction (SCR) device and at least two NOx sensors to measure the efficiency of the SCR device and a controller or host machine. The controller, via the present method, executes a first control action to disable the self-diagnostic tool when one of an occurrence of a particulate filter regeneration event and a non-occurrence of a calibration threshold is detected. The controller executes a second control action, initiating an engine after-run state and enabling the self-diagnostic tool when one of a non-occurrence of a particulate filter regeneration event and an occurrence of the calibration threshold is detected.

Method and system for initiating an engine after-run state and controlling a nitrogen oxide sensor self-diagnostic tool

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Farmington Hills, MI, United States of America

Scott McLane