Electrohydraulic regulating device having pulse width modulating valves with an adjusting signal

US5454291A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Michael Ulm · Alteglofsheim, DE
• Franz Lacher · Tegernheim, DE

Key dates

• Filing date: Jun 19, 1993
• Grant date: Oct 3, 1995
• Expiry date: Jun 19, 2013

Classification

• Technology area (CPC G): Physics
• CPC primary: G05D3/18
• WIPO field: Control
• WIPO sector: Instruments

Abstract

An electrohydraulic regulating device, particularly for a motor vehicle rear axle steering assembly, includes an adjusting cylinder. An electrically actuated control valve controls a hydraulic fluid flow to the adjusting cylinder. At least one electrically actuated switching valve blocks or admits a hydraulic fluid flow. A control unit generates control signals for the control valve and the switching valve. A regulating circuit supplies a pulse-width-modulated regulating signal for regulating a mean current of the control valve. A pulse-width-modulated control signal controls a mean current of the switching valve. The same supply voltage is applied to the switching valve and to the control valve. A pulse-duty factor of the control signal for the switching valve is referred to a pulse-duty factor of an adjusting signal for the control valve.