Gm Global Technolgoy Operations, Inc.

Ramakrishna Tatavarthi

James R Yurgil

Gregory J York

Etsuko Muraji Stewart

Jinbiao Li

Paul Nahra

Jeff Jocsak

Andrew J Kosanka

An engine control system for a vehicle includes a shutdown control module that generates a command to shut down an engine of the vehicle when at least one of: a driver requests the shutdown of the engine via an ignition system; and when one or more predetermined conditions are satisfied for shutting down the engine without the driver requesting shutdown of the engine via the ignition system. A valve control module, when the command to shut down the engine is generated, advances an exhaust camshaft phaser based on a predetermined exhaust park position. When the exhaust camshaft phaser is in the predetermined exhaust park position, an exhaust valve of a cylinder is fully closed during an exhaust stroke of the cylinder before a piston of the cylinder reaches a topmost position for a next intake stroke of the cylinder.

Park positions for variable camshaft phasing systems and methods

A system according to the present disclosure includes a cylinder deactivation module and a valve lift control module. The cylinder deactivation module selectively deactivates a first cylinder of an engine while a second cylinder of the engine is active. When the first cylinder is deactivated, the valve lift control module selectively adjusts a target lift state of a valve actuator of the engine to a first lift state to lift at least one of an intake valve of the second cylinder and an exhaust valve of the second cylinder by a first amount. The valve lift control module selectively adjusts the target lift state of the valve actuator to a second lift state to lift at least one of the intake valve and the exhaust valve by a second amount. The first and second amounts are greater than zero and the second amount is greater than the first amount.

System and method for adjusting the lift state of a valve actuator and for adjusting the number of active cylinders in an engine to improve fuel economy

A powertrain assembly includes a hybrid propulsion system and an internal combustion engine. The hybrid propulsion system includes an electric motor at least partially powering propulsion of a vehicle during a first operating mode and an internal combustion engine at least partially powering propulsion of the vehicle during a second operating mode. The internal combustion engine includes an engine structure defining a combustion chamber and an intake port, an intake valve located in the intake port, and an intake valve lift mechanism supported on the engine structure and engaged with the intake valve. The intake valve lift mechanism is operable in a first lift mode and a second lift mode. The intake valve lift mechanism provides a first intake valve opening profile during the first lift mode and a second intake valve opening profile different than the first intake valve opening profile during the second lift mode.

Hybrid powertrain assembly including engine with variable valve lift

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Rochester Hills, MI, United States of America

Ramakrishna Tatavarthi