Methods and systems for improving engine starting

摘要

Systems and methods for restarting an engine are presented. In one example, fuel is injected to cylinder ports before the engine is stopped such that the injected fuel is not inducted into the cylinders before an engine restart is requested. The method may improve fuel vaporization during engine restarting.

主权项

1. A method for operating an engine, comprising:
ceasing combustion in engine cylinders; cranking the engine; port injecting fuel to a first cylinder while the engine is rotating and intake valves of the first cylinder are closed; stopping the engine without inducting the port injected fuel into the first cylinder; and combusting the port injected fuel in the first cylinder after port injecting fuel to a second cylinder while intake valves of the second cylinder are open, where port injected fuel to the first cylinder is combusted after port injected fuel to the second cylinder is combusted.