Electricity: motive power systems – Motor-reversing – Armature or primary circuit control
Patent
1985-09-11
1987-02-03
Shoop, Jr., William M.
Electricity: motive power systems
Motor-reversing
Armature or primary circuit control
318286, 318280, 318469, 49 28, H02P 122
Patent
active
046410678
ABSTRACT:
The present invention discloses a technique to avoid catching a foreign object in a power window by detecting overload of the window drive motor and stopping or reversing the rotation of the motor in response to said detection. The reference value for detecting overload is updated in accordance with a actual load of the motor in each predetermined time interval .DELTA.T but, in the present invention, when the start of an increase of overload is detected, the beginning of time period .DELTA.T is started again from that time, and thereby detection of overload is always carried out within the shortest period. Moreover, a variety of check mechanisms are also provided for ensuring the fail-safe function of the apparatus and for enhancing reliability of the protective apparatus.
REFERENCES:
patent: 4347465 (1982-08-01), Goertler et al.
patent: 4468596 (1984-08-01), Kinzl et al.
Iizawa Ryuji
Murakami Koji
Aisin Seiki Kabushiki Kaisha
Fujitsu Limited
Ro Bentsu
Shoop Jr. William M.
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