System and method for selective cylinder deactivation

摘要

Embodiments for operating an engine with skip fire are provided. In one example, a method comprises during a skip fire mode or during a skip fire mode transition, port injecting a first fuel quantity to a cylinder of an engine, the first fuel quantity based on a first, predicted air charge amount for the cylinder and lean of a desired air-fuel ratio, and direct injecting a second fuel quantity to the cylinder, the second fuel quantity based on the first fuel quantity and a second, calculated air charge amount for the cylinder.

主权项

1. A method, comprising:
operating an engine according to a skip fire schedule, including activating fuel injection to fire at least one cylinder and deactivating fuel injection to skip at least one cylinder, while maintaining spark ignition to all cylinders; and adjusting the skip fire schedule if combustion is detected in a cylinder with deactivated fuel injection.