Method and device for the failsafe monitoring of the rotational movement of a shaft
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United States of America Patent
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May 24, 2005
Grant Date -
May 20, 2004
app pub date -
Aug 18, 2003
filing date -
Mar 8, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for the failsafe monitoring of the rotational movement of a shaft comprises a first step of picking up a characteristic pulse train with a number of pulses following one another at successive times, the time interval between the pulses is dependent on the rotational movement. A second step determines a monitoring time period and a third step monitors whether an expected pulse of the pulse train occurs within the monitoring time period. Finally, there is a fourth step of generating a control signal when the expected pulse does not occur within the monitoring time period. The mounting time period is repeatedly adapted to the time interval of the pulses during monitoring.
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