Caterpillar Inc.

Bernard L Luebbering

Wayne D Brandt

A method of calibrating the timing of a fuel injected engine using the outputs of first and second position detectors both of which develop signals representing the position of a piston in a cylinder includes the steps of operating the engine using a first reference timing value to determine the time at which a fuel injector is actuated, determining from the output of the second position detector a measured time value representing the length of time between actuation of the fuel injector and the time at which the piston reaches a certain position in the cylinder and subtracting from the measured time value an offset value representing the length of time between actuation of the fuel injector and the actual beginning of fuel injection to obtain an actual timing value. A second reference timing value is calculated from the first reference timing value, the actual timing value and a desired timing value and is subsequently used to determine the time at which the fuel injector is thereafter actuated.

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Morton, IL, United States of America

Bernard L Luebbering