System for determining positions of a control element of an electrically driven actuator

US6895997B2 · kind B2 · utility

Assignee

• HYDAC Electronic GmbH · DE

Inventors

• Wenmin Qu · Dresden, DE
• Horst Mannebach · Rockenberg, DE
• Joachim Morsch · Marpingen, DE

Key dates

• Filing date: Feb 19, 2003
• Grant date: May 24, 2005
• Expiry date: Dec 3, 2023

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T137/8242
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

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.