U.S. Philips Corporation

Bergers, Diethard

Tracht, Rudolf

Lubnau, Jörg

Kower, Oliver

Rudolf Tracht

Lutz Scholten

Jörg Lubnau

Oliver Kower

Diethard Bergers

A control unit (75) for controlling a first state variable of a system, for example an angle of rotation .phi. of a throttle valve (7) in a throttle device for use in an internal-combustion engine, the system being influenced by a disturbance variable during operation, for example an oscillating loading torque caused by air-flow fluctuations in the throttle device. The control unit includes a disturbance observer (125) for calculating a value of the disturbance variable at a first point in time on the basis of a mathematical model of the system, and a disturbance predictor (128) for predicting a value of the disturbance variable at a second point in time which follows the first point in time by a predetermined time interval. In this manner, a phase shift between the disturbance variable actually influencing the system and the compensation provided by the system for the disturbance variable is prevented at high frequencies of the disturbance variable.

Control unit having a disturbance predictor, a system controlled by such

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Dortmund, Germany

Rudolf Tracht