International Truck and Engine Corporation

Jeffrey A McElroy

Thomas M Kramer

An engine speed governor controls a diesel engine in a motor vehicle. The engine control has a processor for processing data for Engine speed governing, including developing fuel request data comprising data components derived from proportional, integral, and derivative processing of difference between actual engine speed and requested engine speed. A data source, such as a gear selector switch in an automatic transmission vehicle or a clutch switch in a manual transmission vehicle, distinguishes between engagement and disengagerrent of the vehicle driveline with and from the engine. A respective first table, such as a map, is associated with each of the proportional, integral, and derivative processing and provides selectable calibration values used by the processor to develop the fuel request data when the driveline is engaged with the engine. A respective second table, such as a function, associated with each of the proportional, integral, and derivative processing provides selectable calibration values used by the processor to develop the fuel request data when the driveline is disengaged from the engine. The invention serves to counter engine speed under-run, especially after prolonged vehicle coasting, by more aggressive proportional control. The principles of the invention may also be embodied in speed governing of a stationary diesel engine.

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Villa Park, IL, United States of America

Jeffrey A McElroy