Robert Boschgmbh

Ingo Kallfass

Gerhard Keuper

Steffen Knapper

Reiner Kunz

Gerold Mueller

Reiner Kurz

A method is for operating a valve that includes a linearly movable control slide, at least one solenoid, and a position sensor. The linearly movable control slide is preloaded by at least one spring in a direction of a zero position. The at least one solenoid is coupled to the control slide in such a way that the control slide can be moved away from the zero position by application of current to the solenoid. The position sensor is configured to measure an actual instantaneous position of the control slide. Each solenoid is assigned a current control device configured to influence a current through the relevant solenoid based on an instantaneous current control variable. The instantaneous current control variable is dependent on a quasi-periodic dither current control variable. The method also includes calculating an actual dither amplitude from the actual instantaneous position using a band-pass filter.

Method for minimizing the dither hum on a valve

A plurality of valves are triggered so that a first valve is triggered by a first trigger signal and a second valve is triggered by a second trigger signal, the first trigger signal and the second trigger signal are each generated by generating a pulse width modulated frequency signal of the first frequency fand a dither signal of the second frequency f, where f&#x3e;f, the trigger signal is generated by modulating the clock pulse duty factor of the frequency signal with the dither signal, and the dither signals of the first trigger signal and of the second trigger signal are synchronized with one another at chronological intervals.

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Bretten, Germany

Ingo Kallfass