Method to reduce engine emissions for an engine capable of multi-stroke operation and having a catalyst

摘要

A method to control valves in a cylinder operating in a multi-stroke cylinder mode. Valves are controlled to improve engine emissions as operating conditions vary.

主权项

1. A method for deactivating at least a cylinder stroke mode of an engine, comprising:
deactivating at least a cylinder stroke mode based on an operating state of at least a catalyst brick, wherein deactivating said cylinder stroke mode reduces a number of strokes available with which to operate a cylinder in a cylinder cycle, said number reduced from a first number of strokes before said deactivating to a second number of strokes after said deactivating, said second number of strokes different than said first number of strokes; and adjusting a valve actuator based on available stroke modes.