Damper motor control circuit for an automotive air conditioning

Details Damper motor control circuit for an automotive air conditioning Damper motor control circuit for an automotive air conditioning

1988-07-20

1990-06-05

Ford, John

Heat exchange

Movable heating or cooling surface

Rotary drum

165 24, 165 42, 165 43, 318434, F25B 2900, G05B 106

Patent

active

049305670

ABSTRACT:
An automotive air conditioning control system comprises a first control circuit for automatically controlling an angle of an air mix damper in accordance with a plurality of variable conditions, for example, an outside air temperature and an inside air temperature. A switching mechanism predetermines either a maximum heating or cooling when closed. A second control circuit moves the air mix damper to a position for either maximum heating or cooling independently of the variable conditions responsive to operation of the switching mechanism. The second control circuit includes a signaling circuit which outputs a drive signal to control the movement of the air mix damper to the position for maximum heating or cooling for only a predetermined period of time. Therefore, even though the air mix damper or a gear for reducing motor speed becomes locked at the time of maximum heating or cooling and a lock detecting function of a microcomputer of the first control circuit fails to operate, a motor of a motor actuator for moving the air mix damper is saved from destruction.

REFERENCES:
patent: 3658244 (1972-04-01), Caldwell
patent: 3934642 (1976-01-01), Coulson et al.
patent: 4311190 (1982-01-01), Walley
patent: 4326386 (1982-04-01), Tamura
patent: 4352452 (1982-10-01), Shimada
patent: 4393342 (1983-07-01), Matsuoka et al.
patent: 4442885 (1984-04-01), Matsuzaki
patent: 4539821 (1985-09-01), Tamura
patent: 4591773 (1986-05-01), Numata
patent: 4678975 (1987-07-01), Vrabel et al.

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