Alliedsignal Inc.

James M Lawson

Ronald W Friend

Duncan E Estep

Stephen P Moran

John D Chambers

Walter E Frankiewicz

A method of determining a calibration factor used to calibrate vehicle speed signals includes the steps of driving the vehicle over a measured distance, counting the pulses generated while driving the vehicle over the measured distance, and then calculating the calibration factor from the number of pulses counted and a nominal pulse count stored in memory. An indication of the difference in a reference speed using the old and new calibration factors is displayed to the vehicle operator who can then choose to accept or abort the new calibration factor.

Method of calibrating vehicle speed signals

A microcontroller having two internal timers is used to calibrate the engine rpm and wheel speed signals of a vehicle and to time the output periods of these signals, which are transmitted to, for example, digital rpm and speed indicators.

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Wellington, OH, United States of America

James M Lawson