Method for diagnosing a short circuit at a capacitive actuator

US6198199A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Christian Hoffmann · Leonberg, DE
• Hellmut Freudenberg · Bad Abbach, DE
• Hartmut Gerken · Nittendorf, DE
• Martin Hecker · Laimerstadt, DE
• Richard Pirkl · Regensburg, DE

Key dates

• Filing date: Sep 8, 1999
• Grant date: Mar 6, 2001
• Expiry date: Sep 8, 2019

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R31/52
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A short circuit between a negative pole GND and a capacitive actuator in a circuit with a charging capacitor, a recharging capacitor, a recharging coil and a selector switch is determined by calculating a value corresponding to the quantity of charge QL flowing off from the recharging capacitor during a charging operation. The quantity of charge is compared with an integral of current i flowing during the charging operation via the selector switch assigned to the actuator. A short circuit of the actuator to the negative pole is diagnosed when the integral is smaller than k*QL (k<1).