METHODS AND SYSTEM FOR REACTIVATING ENGINE CYLINDERS

摘要

Systems and methods for reactivating cylinders of an engine that have been temporarily deactivated to conserve fuel are presented. The systems and methods adjust fuel injection quantity and timing of direct fuel injectors to reduce particulate emissions that may form in cylinders that are being reactivated due to reduced piston and combustion chamber temperatures that may occur in newly reactivated cylinders.

主权项

1. A method, comprising:
operating a first cylinder of an engine while a second cylinder of the engine is deactivated; reactivating the second cylinder in an engine cycle where the first cylinder is supplied a first actual total number of fuel injections; and supplying the second cylinder a second actual total number of fuel injections different than the first actual total number of fuel injections during the engine cycle.