Robert Boschgmbh

Juergen Semler

Christof Ott

Jens Dorfschmid

Bernd Huber

Martin Krohn

Norbert Keim

Walter Fleischer

Wulf-Siegfried Bayha

Wolfgang Rudolf

Wolfgang Rudolph

A method for controlling an electromagnetic valve, in particular for an automatic transmission of a motor vehicle. With known methods, electromagnetic valves are triggered with a pulse-width-modulated signal having a constant clock frequency. The object is to provide a method by which a rapid response characteristic and a high adjustment precision of the electromagnetic valve are made possible. The specific properties of a hydraulic system in which electromagnetic valves are used, in particular the rigidity and damping, are not constant but instead change considerably under different operating states of the hydraulic system and/or with different performance quantities of the electromagnetic valve. These different properties are taken into account through the change in the clock frequency as a function of performance quantities of the electromagnetic valve. The clock frequency may thus be optimally adapted to the properties of the hydraulic system, and a rapid response characteristic and a high adjustment precision are achieved.

Method for controlling an electromagnetic valve, in particular for an automatic transmission of a motor vehicle

The invention proposes a solenoid valve (), in particular for automatic transmissions of motor vehicles. Solenoid valves () have the problem of vibrations that detract from shifting comfort. Integrating a throttle restriction () into the solenoid valve () on the part of the solenoid valve () oriented toward the consumer as proposed by the invention makes it possible to efficiently reduce such vibrations. In addition, the production costs are low, in particular because the throttle restriction () is provided In a filter cage () of the solenoid valve ().

Electromagnet valve, in particular for automatic gearboxes

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Alfdorf, Germany

Juergen Semler