Electricity: motive power systems – Automatic and/or with time-delay means – Movement – position – or limit-of-travel
Patent
1998-08-21
2000-11-21
Sircus, Brian
Electricity: motive power systems
Automatic and/or with time-delay means
Movement, position, or limit-of-travel
318469, 318476, G05B 500
Patent
active
061507849
ABSTRACT:
In a method of detecting a foreign matter caught by a window in a power window device which includes a window opening/closing motor, a motor drive unit, a pulse generator for generating pulses corresponding to the rotation of the motor, an MCU for executing overall control and drive processing and manually-operated switch unit, the MCU detects a parameter value indicating a motor load imposed on a window when the window is opened and closed through the motor drive unit, compares the parameter value with a preset reference median, determines that a foreign matter is caught by the window when the parameter value falls outside the reference median in a considerable amount and stops the drive of the motor or reverses the motor, wherein the reference median that is preset in the range where a foreign matter is detected within the entire moving region of the window is successively changed stepwise by the same displacement value. With the method arranged as described above, the storing area of a memory can be effectively used as well as the storing area can be reduced while maintaining the certainty of the detection of a foreign matter caught by the window.
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Alps Electric Co. ,Ltd.
Sircus Brian
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