Port injection system for reduction of particulates from turbocharged direct injection gasoline engines

A spark ignition engine having port fuel injectors and direct fuel injectors;

• wherein the port fuel injectors and direct fuel injectors introduce a same fuel into the spark ignition engine;
• wherein the same fuel that is introduced into the spark ignition engine comprises gasoline;
• wherein at an earliest time in cold start, the spark ignition engine is fueled using both direct fuel injection and port fuel injection;
• wherein at the earliest time in cold start, more fuel is introduced by direct fuel injection than by port fuel injection;
• wherein stop-start engine operation is used during deceleration and idling;
• wherein in stop-start operation, the spark ignition engine is fueled with direct fuel injection alone at an end of engine shutdown;
• wherein in stop-start operation, the spark ignition engine is fueled with direct fuel injection alone when it is restarted;
• wherein after the spark ignition engine is restarted with direct fuel injection alone, port fuel injection is introduced;
• wherein in a portion of a drive cycle, the spark ignition engine is fueled with port fuel injection alone;
• wherein in a second part of the drive cycle, the spark ignition engine is fueled with both port fuel injection and direct fuel injection;
• wherein in certain portions of the second part of the drive cycle, a relative amount of fuel provided by port fuel injection is increased and spark timing is changed so as to become more retarded;
• and
• wherein in certain other portions of the second part of the drive cycle, the relative amount of fueling provided by port injection increases with increasing torque.

A spark ignition engine having port fuel injectors and direct fuel injectors;

• wherein the port fuel injectors and direct fuel injectors introduce a same fuel into the spark ignition engine;
• wherein the same fuel that is introduced into the spark ignition engine comprises gasoline;
• wherein at an earliest time in cold start, the spark ignition engine is fueled with direct fuel injection alone;
• wherein following the earliest time in cold start, port fuel injection is introduced;
• wherein stop-start engine operation is used during deceleration and idling;
• wherein in stop-start operation, the spark ignition engine is fueled with direct fuel injection at an end of engine shutdown;
• wherein in stop-start operation, the spark ignition engine is fueled with direct fuel injection alone when it is restarted;
• wherein during at least part of a drive cycle, a relative amount of fueling provided by port fuel injection increases as the spark ignition engine warms up;
• and
• wherein information about temperature is employed in controlling an amount of port injection that is used.

A spark ignition engine having port fuel injectors and direct fuel injectors;

• wherein the port fuel injectors and direct fuel injectors introduce a same fuel into the spark ignition engine;
• wherein the same fuel that is introduced into the spark ignition engine comprises gasoline;
• wherein at an earliest time in cold start, the spark ignition engine is fueled with direct fuel injection and port fuel injection;
• wherein at an earliest time in cold start, more fuel is introduced by direct injection than port injection;
• wherein following the earliest time in cold start, port fuel injection is introduced;
• wherein stop-start engine operation is used during deceleration and idling;
• wherein in stop-start operation, the spark ignition engine is fueled with direct fuel injection at an end of engine shutdown;
• wherein in stop-start operation, the spark ignition engine is fueled with direct fuel injection when it is restarted;
• wherein during at least part of a drive cycle, a relative amount of fueling provided by port fuel injection increases as the spark ignition engine warms up;
• and
• wherein information about temperature is employed in controlling an amount of port injection that is used.