Method for increasing the availability of displacement/position measuring systems on the basis of potentiometers with a slider tap

US8447555B2 · kind B2 · utility

Assignee

• ABB TECHNOLOGY AG · CH

Inventors

• Stefan Tabelander · Herford, DE
• Thomas Kleegrewe · Minden, DE
• Andreas Wahlmann · Meerbeck, DE

Key dates

• Filing date: Aug 3, 2010
• Grant date: May 21, 2013
• Expiry date: Feb 15, 2031

Classification

• Technology area (CPC G): Physics
• CPC primary: G05B2219/42329
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

The disclosure relates to a method for increasing the availability of displacement/position measuring systems on the basis of potentiometers with a slider tap in a closed control loop, the controller of which is formed by a microcontroller which is supplied with the position of the slider via an analog/digital converter. At least part of the sensor range of the potentiometer is scanned on request by presetting a sequence of manipulated variables and an available control loop variable which represents the position value at a high sampling rate outside process tasks is recorded, to determine the exact position of a defective slider position of the potentiometer by evaluating the variable. The reference variable of the control loop is overloaded in a defined manner within the process task such that the defective slider position is passed over during the displacement/position measurement and an intact slider position is reached.