Patent ID: 7201127
Filing Date: 2007-04-10
Classification: F02D,Y02T

Abstract:
1. A method of initially operating an internal combustion engine comprising the steps of: initiating operation of the internal combustion engine, including operating the engine in a start-up mode that includes injecting a main shot and at least two fuel pre-shots into at least one cylinder of the engine during an engine cycle, wherein a first pre-shot is smaller in quantity than a last pre-shot; wherein the step of initiating operation further comprises the steps of: pressurizing a fuel to a start of injection pressure in a common rail of the internal combustion engine; determining a total fuel pre-shot injection quantity; determining a number of fuel pre-shots; and apportioning the total fuel pre-shot injection quantity among the at least two fuel pre-shots via a fuel pre-shot quantity slope mapped to engine temperature and engine speed; the method further comprising the steps of: determining an intake manifold pressure; determining an engine temperature; determining an engine speed; and concluding operation in the start-up mode; wherein the step of initiating operation further comprises the step of pressurizing the fuel to a start of injection pressure in the common rail that is based on the determined intake manifold pressure and the determined engine temperature; and wherein the step of initiating operation further comprises injecting a first of the at least two fuel pre-shots at a predetermined crank angle of the internal combustion engine that is based at least in part on at least one of the determined engine speed and the determined engine temperature.