Gm Global Technolgoy Operations, Inc.

Ivan R Samalot

Mark James Spath

Timothy Wilton Kunz

Scott H Nather

Timothy J Peterson

Christopher M De Minco

Christopher M DeMinco

Daniel R Cuatt

Bohdan Michael Lyko

John S Lylak, Jr

Thomas Howard Lichti

Internal combustion engine variable valve timing control with a camshaft phaser for varying rotational phase between a camshaft and a crankshaft in response to a control command determined through a hybrid control strategy without resort to direct temperature measurement. For a range of phase errors requiring high response compensation, a control strategy emphasizing rapid response, such as a bang-bang strategy, is deployed. For a range of phase errors requiring high accuracy compensation, a control strategy emphasizing high precision, such as a proportional-plus-integral strategy, is deployed. The phase error ranges are updated periodically to account for changes in operating conditions. The control command includes an offset which varies in response to a periodically estimated control deadband to affirmatively account for the deadband with each issued control command.

Closed-loop camshaft phaser control

Compact valve lifters are disclosed for overhead camshaft engines with direct acting valve gear and for engines with indirect acting valve actuation such as push rod actuated overhead valves. Two step variable lift and non-variable lift valve lifters are included as are roller and non-roller follower types with various features in common.

Compact valve lifters

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Rochester, NY, United States of America

Ivan R Samalot