Patent ID: 6906487

Claim:
An anti-pinch window system for a power window having a fully closed position, the system comprising: a drive circuit capable of supplying a drive current; a reversible d-c motor operably coupled to the drive circuit electrically, the motor being mechanically coupled to the power window such that the motor is capable of raising and lowering the window; a reference circuit operably coupled to the drive circuit such that the reference circuit is capable of detecting, without an external sensor, both a measure of the drive current and a measure of a back EMF of the motor, distinguishing normal operation of the motor during raising of the window to the fully closed position from interruption of the raising of the window by an unsafe condition based on both the measure of the drive current and the measure of the back EMF of the motor, wherein the occurrence of the unsafe condition is distinguished; and a control circuit operably coupled to the reference circuit and the drive circuit, such that the control circuit controls the drive circuit and automatically reverses the direction of the motor in response to the occurrence of the unsafe condition.