Patent ID: 9638128
Date: 2017-05-02
CPC Classifications: F02D,Y02T

Claim:
1. A method of operating a compression ignition engine by fueling an engine cylinder to create an in-cylinder air-fuel charge and to cause that charge to autoignite, the method comprising: operating a fuel injector to inject fuel into the engine cylinder for the entire duration of a first phase of fuel injection at a maximum injection pressure that the fuel injector can deliver to create a premixed fraction of the in-cylinder air-fuel charge prior to autoignition, with the duration of the first phase of fuel injection being based at least in part on a speed and a load of the engine; operating the fuel injector to inject a second phase of the same fuel into the engine cylinder at an injection pressure less than the maximum injection pressure that the fuel injector can deliver, with the second phase of fuel being injected in advance of autoignition of the first phase of fuel and the injection pressure of the second phase of fuel injection being based at least in part on the speed and load of the engine.