Method of detecting a malfunction during a displacement of an element by means of a drive system, and device suitable for carrying out such a method
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United States of America Patent
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-
Feb 6, 2007
Grant Date -
Oct 27, 2005
app pub date -
Jul 7, 2003
filing date -
Aug 6, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and a device are provided for detecting the occurrence of a malfunction upon movement of an element by a driving system. While the element is being moved, a difference between a predetermined value and an actual value is determined at regular intervals by means of a processor. A derivative of the difference is determined by the processor at regular intervals. The difference and the derivative both fluctuate around an equilibrium value. Subsequently, only the values on one side of the equilibrium value of both the difference and the derivative are sampled. The sampled values are multiplied and the result is compared with a reference value by means of the processor. The occurrence of a malfunction is established if the result of the multiplication is higher than the reference value.
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