Power window control with tape drive tension release

Details Power window control with tape drive tension release Power window control with tape drive tension release

1986-02-24

1986-12-30

Dobeck, B.

Electricity: motive power systems

Motor-reversing

318266, 318282, 318626, H02P 122

Patent

active

046331530

ABSTRACT:
Motor control apparatus is disclosed for a motor driven vehicle power window mechanism including a flexible drive element, such as a drive tape, adapted to drive the window in a predetermined direction by being placed in tension by the motor. The tension of the flexible drive element is relieved by automatically reversing motor direction for a short time when the window reaches the desired position. The reverse motor rotation is accurately controlled to an amount sufficient to relieve drive tension but insufficient to produce unwanted reverse movement of the window by detecting the pulses of the armature ripple current as the successive commutator bars pass the brushes during reverse motor rotation, integrating these pulses and stopping the reverse motor operation when the integrated value reaches a predetermined reference.

REFERENCES:
patent: 3588652 (1971-06-01), Lewis
patent: 3733532 (1973-05-01), Hill
patent: 3891909 (1975-06-01), Newson
patent: 4065707 (1977-12-01), Becker
patent: 4203057 (1980-05-01), Totsu
patent: 4246520 (1981-01-01), Giles
patent: 4284935 (1981-08-01), March et al.

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