Motor control device for vehicular power mirror
AssigneeMurakami Corporation
InventorsAyako Yamada, Akiyoshi Kobayashi, Mitsuyoshi Nagao
Life of this patent
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Abstract
When a signal level of a motor brush switching signal is low and thus dropouts or omission of the pulse signals converted by a waveform shaping part take place, so that an interval between a pulse signal to be currently counted and an immediately preceding pulse signal thereof becomes longer than a predetermined average interval, a pulse signal counter makes a correction of the number of counts by adding one pulse to the pulse to be counted. Therefore, even if the signal level of the motor brush switching signals generated from a vertical motion motor M2 is low for some reasons, accurate control can be exercised over the number of rotations of the vertical motion motor M2.
Claims2
A motor control device for a vehicular power mirror comprising:
- a driving motor that is constructed of a direct current brush motor;
- a motor signal detector that utilizes a pickup coil connected in series with the driving motor to detect high-frequency motor brush switching signals generated from the driving motor, and outputs the detected high-frequency motor brush switching signals shaped in a waveform of pulse signals;
- and
- a pulse signal counter that counts the pulse signals, wherein the pulse signal counter makes a correction of the number of counts by adding one pulse thereto every time an interval between a pulse signal to be currently counted and an immediately preceding pulse signal thereof is longer than a predetermined average interval.
Dependencies are inferred from the claim text.