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Inductive load control

專利號
US10867734B2
公開日期
2020-12-15
申請人
ZF Friedrichshafen AG(DE Friedrichshafen)
發(fā)明人
Florian Weinl; Christoph Stritt; Ulrich Schmidt
IPC分類
H02M3/158; H01F7/18; H02M5/293; H02M3/155; H02M1/00; F16D25/00; F16D48/06; F16H61/02; F16K31/06
技術領域
voltage,load,value,in,loads,terminals,inductive,armature,can,be
地域: Friedrichshafen

摘要

A plurality of inductive loads (105) are connectable in parallel with one another between first and second terminals (120, 125), to which a controllable voltage (205) is applied. A method (300, 400) for operating the loads (105) includes the steps of detecting (305, 405) the connection of a previously non-energized load (105) between the terminals (120, 125); setting (310, 410, 435) the voltage (205) to a predetermined first value (210), and, after the lapse of a predetermined time interval (315, 415), adjusting the voltage (205) to a predetermined second value (215), with the second value (215) being lower than the first value (210).

說明書

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By virtue of the temporary voltage elevation the previously non-energized load that is, or is to be connected, is brought into operation more effectively. In particular the build-up of a current flowing through the inductive load can be accelerated. If the inductive load comprises a solenoid, the solenoid can build up a magnetic field in a short time, which can in particular exert a force on an armature. A control process by means of the solenoid and the armature can therefore take place more rapidly and more reproducibly. The armature can act, for example, on a pneumatic valve, a hydraulic valve or a mechanical actuator. Preferably, the solenoid and the armature are arranged in a transmission, particularly a transmission in a utility vehicle. The dynamics of the control can be variable and the ability of the load to be controlled or regulated can be improved. The method can be implemented by means of a known control device for a plurality of loads connected mutually parallel with one another.

By reducing the voltage to the second predetermined value an excessive flow of current through one of the loads can be avoided. Consequently, an excessive voltage drop across the loads can be avoided, which can damage the load to the point of functional failure. Furthermore a drop of efficiency, an elevation of the temperature of the load or an element thermally coupled to it, a reduction of the life of the load or a limitation of its function by some monitoring device can be prevented.

權利要求

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