Late intake valve closing to improve cold startability for spark-ignition direct-injection (SIDI) engines
AssigneeGM Global Technology Operations LLC
InventorsVijay Ramappan, Jesse M. Gwidt, Stuart R. Smith, Michael J. Lucido, Scot A. Douglas, Kenneth J. Cinpinski
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Abstract
An engine control system includes a cam phaser that introduces a cam phase angle θ between a camshaft intake lobe and an associated crankshaft. An engine control module communicates with the cam phaser to introduce the cam phase angle θ while an engine is being started. The cam phase angle θ is selected such that the camshaft intake lobe opens an intake valve during at least a portion of a compression stroke of a cylinder that is associated with the camshaft intake lobe.
Claims9
An engine control system, comprising:
- a cam phaser that introduces a cam phase angle θ between a camshaft intake lobe and an associated crankshaft;
- and
- an engine control module that communicates with the cam phaser to introduce the cam phase angle θ while an engine is being started and wherein the cam phase angle θ is selected such that the camshaft intake lobe opens an intake valve during at least a portion of a compression stroke of a cylinder that is associated with the camshaft intake lobe.
A method of controlling an engine, comprising:
- determining whether an engine is being started;
- and
- introducing a cam phase angle θ while the engine is being started, wherein the cam phase angle θ is selected such that an intake valve is open during at least a portion of a compression stroke of a cylinder that is associated with the intake valve.
An engine control system, comprising:
- a cam phaser that controls a cam phase angle θ between a camshaft intake lobe and an associated crankshaft of an engine;
- a fuel injector that injects fuel directly into a cylinder;
- a fuel pump that is driven by the engine and that provides the fuel to the fuel injector;
- and
- an engine control module that communicates with the cam phaser to introduce the cam phase angle θ while the engine is being started and to eliminate the cam phase angle θ after the engine is started, wherein the cam phase angle θ is selected such that the camshaft intake lobe opens an intake valve during at least a portion of a compression stroke of a cylinder that is associated with the camshaft intake lobe.
Dependencies are inferred from the claim text.