Patent ID: 7894976
Filing Date: 2011-02-22
Classification: F02B,F02D,F02P,Y02T

Abstract:
1. Method for controlling a spark-ignited, direct injection, homogeneous-charge compression-ignition capable, internal combustion engine operating with spray-guided spark ignition stratified combustion at low load, including selectively utilizing lowered injected fuel pressure in a fuel injection system to increase combustion stability, said method comprising: monitoring a speed of the engine; monitoring a load of the engine; determining a desired injected fuel pressure based upon the speed of the engine and the load of the engine; and utilizing the desired injected fuel pressure to control fuel injection into the engine; wherein the desired injected fuel pressure is calibrated to the speed and the load based upon increased combustion stability of the engine corresponding to lower variability in in-cylinder pressures at lower injected fuel pressures and lower soot emissions from the engine at higher injected fuel pressures.