Patent ID: 8944027
Filing Date: 2015-02-03
Classification: F02D,F02M,Y02T

Abstract:
1. A method of operating an engine, comprising sequentially carrying out the steps of: changing a ratio of a premix quantity of gaseous fuel to a post ignition quantity of gaseous fuel as a function of at least one of a speed and a load of the engine, wherein each of the premix quantity of gaseous fuel and the post ignition quantity of gaseous fuel is greater than zero; injecting the premix quantity of gaseous fuel into an engine cylinder from a dual fuel injector in an engine cycle; injecting a pilot ignition quantity of liquid fuel into the engine cylinder from the dual fuel injector in the engine cycle during an autoignition condition in the engine cylinder; compression igniting the pilot ignition quantity of liquid fuel; and igniting the premix quantity of gaseous fuel after compression igniting the pilot ignition quantity of liquid fuel.