Power window switch which incorporates express up/down and windo

Details Power window switch which incorporates express up/down and windo Power window switch which incorporates express up/down and windo

1997-01-28

1999-01-05

Martin, David

Electricity: motor control systems

Open loop speed control system for dc motor with commutator

Armature control by digital or combined analog and digital...

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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