Control system for automobile air conditioners

Details Control system for automobile air conditioners Control system for automobile air conditioners

1980-03-11

1982-07-13

Wayner, William E.

Automatic temperature and humidity regulation

Motors

Fluid-operated

91361, 165 43, G05D 2300, B60H 300

Patent

active

043390765

ABSTRACT:
A control system for an automobile air conditioner including an air blend door for adjusting the output of the air conditioner, a vacuum actuator including a hermetic chamber and a control member, the control member being connected to control the air blend door proportionally to the pressure within the chamber, a vacuum modulator including a first valve for exhausting air from the chamber to a vacuum reservoir, a second valve for emitting air from atmosphere to the chamber and a restriction member arranged at the entrance side of the chamber, a control circuit for providing a first electrical driving signal for operating the first valve so as to open and a second electrical driving signal for operating the second valve so as to open proportionally to the difference between a selected temperature within the automobile and the actual temperature within the automobile, an integrating circuit for providing integrated outputs of the first electrical driving signal and the second electrical driving signal with a time constant determining the volume of the chamber and the diameter of the restriction and a feedback loop for applying the integrated outputs to the input of the control circuit.

REFERENCES:
patent: 3315730 (1967-04-01), Weaver et al.
patent: 3477346 (1969-11-01), Slavin et al.

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