Electricity: motive power systems – Automatic and/or with time-delay means – Movement – position – or limit-of-travel
Patent
1990-04-23
1991-09-24
Ro, Bentsu
Electricity: motive power systems
Automatic and/or with time-delay means
Movement, position, or limit-of-travel
318266, 318286, 318434, E05F 1508, H02P 122
Patent
active
050516728
ABSTRACT:
An automatic window opening/closing system includes a motor for driving a window. In association with the window, a pressure responsive sensor (preferably, a pressure responsive sensor with a coaxial structure having uniform sensitivity to pressures in all directions) is provided. A detector circuit is coupled to the pressure responsive sensor and evaluates a rate of change of a pressure on the sensor, thereby detecting a squeezed object caught in a way of the window during an operation of the system. A motor control circuit is provided to control the motor in response to a squeezed object detection signal from the detector circuit in such a direction to release the object from the window. The motor control circuit detects an overload condition of the motor in accordance with a motor terminal voltage and deenergizes the motor to prevent the motor from generating heat. Therefore, this system achieves improved performance, high reliability and safety.
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Kabushiki Kaisha Riken
Ro Bentsu
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