Automatic temperature and humidity regulation – Mixing fluid of dissimilar temperature – Plenum type
Patent
1988-07-20
1989-05-30
Tapolcai, William E.
Automatic temperature and humidity regulation
Mixing fluid of dissimilar temperature
Plenum type
236 495, 25112912, 318468, G05D 2313
Patent
active
048342831
ABSTRACT:
A damper position control device for an automotive air conditioning system having a lock release mechanism for the drive shaft of a motor which controls the angular position of an air mix damper. A damper position control device is disclosed which controls the angular position of an air mix damper. The damper position control device includes a motor actuator which drives the air mix damper and a control circuit. The motor actuator includes a drive motor for the air mix damper and a rotation control device including a regulator which regulates the upper and lower rotational limits of the shaft of the drive motor and a position detector which detects the rotational angle of the shaft. The control circuit controls the motor actuator in accordance with a plurality of detected signals. The control circuit generates a drive signal which drives the motor actuator and further includes a lock detector which detects if the shaft of the motor is locked against rotational motion in a first rotational direction. The control circuit also includes a lock release which releases the motor so as to permit rotational motion in a second rotational direction after the motor as been locked against rotational motion in the first rotational direction if the motor is within a first predetermined angular displacement from the upper rotational limit or within a second predetermined angular displacement from a lower rotational limit and if the drive signal causes the motor to rotate in the second rotational direction.
REFERENCES:
patent: 3914676 (1975-10-01), Madonian et al.
patent: 3934642 (1976-01-01), Coulson et al.
patent: 4099704 (1978-07-01), Okumura et al.
patent: 4513808 (1985-04-01), Ito et al.
patent: 4593852 (1986-06-01), Tajima et al.
patent: 4723102 (1988-02-01), Oppermann et al.
Akabane Hidemitsu
Hoshino Seiichi
Isobe Toshimi
Sanden Corporation
Tapolcai William E.
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