Power window switch which incorporates express up/down and window motor speed control features using a force sensitive resistor or capacitor

A method of varying the speed of raising and lowering a vehicle-powered window lift comprising:

• (a) guiding a vehicle window for movement in a generally vertical direction;
• (b) engaging said window with lifting structure;
• (c) connecting said lifting structure to an electrically energized motor;
• (d) providing a force transducer and decreasing the impedance thereof in response to increasing user-applied force thereto;
• (e) detecting changes in the impedance of said transducer;
• (f) generating an electrical control signal indicative of said changes in impedance;
• and
• (g) modulating a driver signal with said control signal and applying said driver signal to said motor and energizing said motor and varying the motor speed according to the level of modulation of said driver signal.

A variable speed vehicle window power lift system comprising:

• (a) a force transducer responsive to increasing user manual pressure on an input member to provide a decreasing electrical impedance;
• (b) circuit means connected to an onboard vehicle power source and operative to produce a control signal indicative of said decreasing impedance;
• (c) a power switching circuit connected to an onboard vehicle power source and having its input connected to receive said control signal and operative to provide a power signal modulated according to said control signal;
• (d) a moveable vehicle window including structure operable for guiding window movement;
• (e) a bi-directional motor and lift linkage connected to said window and driven by said motor, said motor operative upon energization by said power signal to lower and raise said vehicle window, wherein said motor is increased in speed as said user's manual pressure on said input member increases;
• and,
• (f) timing means operative to latch said motor "on" at maximum speed when said impedance is decreased below a predetermined threshold.