Method for starting an engine

摘要

A method for improving starting of an engine that may be repeatedly stopped and started is presented. In one embodiment, the method controls a transition from split fuel injection timing during an engine start to single event fuel injection during idle speed or engine torque control modes. The method better manages vehicle launch performance when the engine is restarted while coupled to an automatic transmission that is in gear.

主权项

1. A method for starting an engine, comprising:
stopping the engine; automatically starting the engine in response to a condition; in a first mode, injecting fuel to at least one cylinder during the automatic start, the injection of fuel during a cycle of a cylinder and comprising a first injection and a second injection, and transitioning to injecting fuel once during a cycle of the cylinder in response to intake manifold pressure less than a threshold pressure and an engine speed greater than a threshold speed during the automatic starting of the engine; and in a second mode, injecting fuel to at least one cylinder during the automatic start, the injection of fuel during a cycle of the cylinder and comprising a first injection and a second injection, and richening an air-fuel mixture of the at least one cylinder in response to the intake manifold pressure being not less than the threshold pressure and in response to the engine speed being less than the threshold speed during the automatic starting of the engine.