Patent ID: 7328690
Filing Date: 2008-02-12
Classification: F02D,F02M,Y02T

Abstract:
1. A system for detecting a fuel injection closing point associated with a cylinder of a locomotive diesel engine, the system comprising: a fuel injection pump solenoid associated with the cylinder of the locomotive diesel engine; a fuel injection pump solenoid driver circuit for providing a current and a voltage to a winding of the fuel injection pump solenoid, said fuel injection pump solenoid having a low side driver for selectively supplying a first voltage to a low side of the fuel injection pump solenoid and a high side driver for selectively supplying a second voltage to a high side of the fuel injection pump solenoid; a sensor for detecting the current through the winding of the fuel injection pump solenoid; a detector responsive to the sensor for detecting a change in a slope of the current as a function of time, said change of slope being from a decrease in current over time to an increase in current over time; a processor responsive to the detector and configured with computer instructions stored on a computer readable medium for determining a capacitive charge value as a function of a measurement, operating characteristic or parameter of the engine, said processor electrically coupled to the capacitive charge circuit for providing the capacitive charge to the capacitive charge circuit; and a capacitive charge circuit coupled to the fuel injection pump solenoid for modifying the voltage and the current provided by the fuel injection pump solenoid driver circuit as a function of the determined capacitive charge value.