Circuit arrangement for controlling hydraulic valve of e.g. vehicle anti-lock braking system

The arrangement has a valve driver for switching the valve exciting current on and off. It also has a load dump diode (LDD) to limit overvoltage and break current. By using a generator battery unit, these behave as a direct current source. After switching over the valve for a holding phase (ZH), the...

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Bibliographische Detailangaben
Hauptverfasser:	ZINKE, OLAF, 65719 HOEIM, DE, FEY, WOLFGANG, 65527 NIEDERNHAUSEN, DE, ZYDEK, MICHAEL, 35428 LANGGOENS, DE, ENGELMANN, MARIO, 61449 STEINBACH, DE
Format:	Patent
Sprache:	eng ; ger
Schlagworte:	ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL PERFORMING OPERATIONS PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OFVEHICLES TRANSPORTING VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES VEHICLES IN GENERAL
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Beschreibung
Zusammenfassung:	The arrangement has a valve driver for switching the valve exciting current on and off. It also has a load dump diode (LDD) to limit overvoltage and break current. By using a generator battery unit, these behave as a direct current source. After switching over the valve for a holding phase (ZH), the valve exciting current (iL) is reduced to a holding current (IHU, IHO). The holding current is provided via an additional current path (4) by timed controlling of the valve drive during the holding phase and maintaining the holding current during the blocking interval of the valve driver (1,2). To switch the hydraulic valve back to its rest position quickly, the energy supplied in the valve spool (L) is reduced by current flow in the load dump diode (LDD).