Power window switch which incorporates express up/down and windo

Electricity: motor control systems – Open loop speed control system for dc motor with commutator – Armature control by digital or combined analog and digital...

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388840, 318280, 318446, 49140, H02P 729

Patent

active

058570616

ABSTRACT:
A system for enabling a vehicle operator to control the speed or rate of raising and lowering of a powered lift window. The actuator or switch includes a pressure responsive variable impedance device comprising a variable resistance in one embodiment and a variable capacitance in another embodiment. Increasing force directly on the variable impedance device by the user's finger or an actuator decreases the impedance which is sensed by a voltage divider which outputs a voltage which increases with increasing force. This latter voltage is compared with the output of a triangle wave oscillator and the output of the comparator is a pulse width modulated signal with pulse-width proportional to applied force. The pulses are applied to a power device (Mosfet) which modulates the duty cycle (%) of the current to the window lift mechanism drive motor to give variable motor speed.

REFERENCES:
patent: 3710050 (1973-01-01), Richards
patent: 3830018 (1974-08-01), Arai et al.

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