METHOD FOR CONTROLLING AN INTERNAL COMBUSTION ENGINE

摘要

A fuel injection strategy and ignition timing for a spark-ignition direct fuel injection engine are selected in response to monitored engine load in relation to a plurality of load regions. This includes selecting a preferred ignition timing based upon the engine load, and selecting a first fuel injection event that is executed post-ignition, wherein the first fuel injection event delivers a set fuel mass at a preset timing relative to the preferred timing for the spark ignition event regardless of the engine load. A first pre-ignition fuel injection event is selected, and includes a second fuel mass being injected at a second fuel injection timing, wherein an end-of-injection timing of the first pre-ignition fuel injection event is at a preset timing relative to the preferred ignition timing regardless of the engine load, and wherein the second fuel mass is determined in relation to the engine load.

主权项

1. A method for controlling a spark-ignition, direct fuel injection internal combustion engine, the method comprising:
separating engine load into a plurality of separate, contiguous load regions ranging between a minimum load region and a maximum load region; monitoring engine load; selecting a preferred fuel injection strategy and selecting a preferred ignition timing for each cylinder event responsive to the monitored engine load and in relation to the plurality of load regions; and executing the selected preferred fuel injection strategy and executing a spark ignition event at the preferred ignition timing for each cylinder event; wherein selecting the preferred fuel injection strategy and preferred ignition timing for each cylinder event responsive to the monitored engine load in relation to the plurality of load regions includes:
selecting the preferred ignition timing based upon the engine load,selecting a first fuel injection event that is executed post-ignition, wherein the first fuel injection event delivers a set fuel mass at a preset timing relative to the preferred timing for the spark ignition event regardless of the engine load, andselecting a first pre-ignition fuel injection event including a second fuel mass being injected at a second fuel injection timing, wherein an end-of-injection timing of the first pre-ignition fuel injection event is at a preset timing relative to the preferred ignition timing for the spark ignition event regardless of the engine load, and wherein the second fuel mass is determined in relation to the engine load.