Processing a motor variable of a DC motor and actuating device for a motor vehicle
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United States of America Patent
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Aug 20, 2013
Grant Date -
Feb 21, 2013
app pub date -
Oct 22, 2012
filing date -
Apr 22, 2010
priority date (Note) -
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Abstract
A method processes a motor variable of a DC motor of an actuating device for a motor vehicle. The DC motor is supplied by an on-board system DC voltage, in which the armature current and the motor voltage of the DC motor are detected and the actuating position of an actuating element is determined from a time profile of the armature current by counting the current ripple contained therein. During an initial phase, the armature current which rises over time is replicated by a function which is determined from pairs of values for the motor voltage and the armature current which are detected in a time interval. A current value of the armature current expected at a later point in time is extrapolated. In the event of a discrepancy between the armature current detected at this later point in time and the extrapolated armature current, a ripple count is started.
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