Patent ID: 6564623
Filing Date: 2003-05-20
Classification: F02B,F02D,F02F,G01L

Abstract:
A method for exactly determining the top dead center of an internal combustion engine having a piston, cylinder, and crankshaft from pressure inside the cylinder, comprising the steps of:directly measuring the top dead center as a function of crankshaft angle; measuring pressure values in the cylinder as a function of crankshaft angle for selected operating points of the engine; correlating and storing the respective pressure value and top dead center measurements as digitized value pairs in a data set; inputting the data set into a knowledge based system which produces an output for the occurrence of top dead center; training the knowledge based system with elements from the data set until the knowledge based system recognizes, from the pressure value inside the cylinder, the associated top dead center obtained from the direct measurement at all the selected operating points; and determining the top dead center from only the measured pressure value in the cylinder, at operating points not used during training, using the knowledge-based system as trained without further training.