Patent ID: 6363912
Filing Date: 2002-04-02
Classification: F02D

Abstract:
A method of regulating rotational speed of a multicylinder internal combustion engine having a crankshaft and fuel injection, comprising:detecting, using at least one sensor, a rotational speed and direction of rotation of a pole wheel which is driven by the crankshaft and generates, for each revolution, pulses sensed by the at least one sensor; compensating for deviations of the rotational speed from a predefined setpoint rotational speed value using an actuator which influences the fuel injection of the engine; continuously measuring a time required for a defined sequence of successively sensed pulses, the number of successively sensed pulses being defined as a function of a number of cylinders of the engine and a number of pulses generated by the pole wheel per revolution; determining equidistant, uncorrected actual rotational speed values using the continuously measured time; measuring a time required for the number of sensed pulses corresponding to one complete revolution of the pole wheel to form an average rotational speed; smoothing a difference between the average rotation speed and each uncorrected actual rotation speed value to form corrected actual rotational speed values; limiting a magnitude of the smoothed difference; adding the limited smoothed difference to the uncorrected actual rotation speed values; comparing the corrected actual rotational speed values with the predefined setpoint rotational speed value; feeding a result of the comparison to a controller; and determining an output value using the result to control the actuator.