COLD-START RELIABILITY AND REDUCING HYDROCARBON EMISSIONS IN A GASOLINE DIRECT INJECTION ENGINE

摘要

A method for starting an engine of a motor vehicle under varying temperature conditions, the engine having a plurality of combustion chambers and a pump for pressurizing fuel for delivery to the combustion chambers, the method comprising during a first, higher-temperature, starting condition, directly injecting fuel into all of the combustion chambers during at least an initial fueled cycle of the engine, and spark igniting the fuel to increase a rotation speed of the engine, the initial fueled cycle comprising two rotations of a crankshaft of the engine during which at least some fuel is injected for a first time since the engine was brought from rest; and during a second, lower-temperature, starting condition, directly injecting fuel into less than all of the combustion chambers during at least the initial fueled cycle of the engine, and spark igniting the fuel to increase the rotation speed of the engine.