Hydac Electronic Gmbh

Wenmin Qu

Horst Mannebach

Joachim Morsch

Julien Frederic Gamel

Leo Mathias Jirgal

A device () measures capacity, and includes an electrode arrangement with a plurality of electrodes (E, E, . . . , En) which are adjacently and/or successively arranged on a carrier (). An intrinsic measuring device () measures the capacitance between a first electrode (E), in the form of a measuring electrode, and a second electrode (E), in the form of a counter-electrode. A controllable switching device () connects the electrodes (E, E, . . . , En), in the form of first and second electrodes (E, E), to the measuring device () in such a way that they can be switched in a pre-determinable manner. Each electrode (E, E, . . . , En) of the electrode arrangement can be switched in a controlled, alternate manner by the switching device (), in the form of a measuring electrode, and respectively at least one of the other electrodes (E, E, . . . , En), in the form of a counter-electrode, can be switched to a pre-determinable reference potential. An associate method and a device () determine the level () of a liquid () using one such device ().

Device and method for measuring capacitance and device for determining the level of a liquid using one such device

System determines the position of a control element of an electrically driven actuator. The actuator may be switched on by a controlled switch when a lower threshold value is reached and may be switched off when an upper threshold value is reached. An on-period and an off-period are determined as a function of the lower threshold value, the upper threshold value, and the electric switching behavior of the actuator depending on the position of the control element. From the on-period and the off-period, the position of the control element are determined from a comparison of the quotient of the on-period or off-period and the sum of the on-period and off-period, and from a comparison of the sum of the on-period and the off-period with corresponding stored reference data. The system includes accompanying circuitry for application of the process, and an accompanying device, in particular a hydraulic valve.

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St. Ingbert, Germany

Wenmin Qu