Heat exchange – Movable heating or cooling surface – Rotary drum
Patent
1977-09-12
1979-04-03
Freeh, William L.
Heat exchange
Movable heating or cooling surface
Rotary drum
165 43, 236 84, F25B 2900, B60H 300
Patent
active
041472055
ABSTRACT:
An automatic control system for regulating the temperature of the passenger compartment in automotive vehicles is disclosed of the type in which a vacuum operated actuator is utilized to control the position of a blend air door, the position of the blend air door in turn controlling the temperature of the air circulated into the passenger compartment by proportioning the flow of cooled air circulated through a heater prior to entering the passenger compartment. This air flow is utilized to correct the temperature level in the passenger compartment. The disclosed control system features a nulling pressure signal feedback loop in which the error signal developed by the difference in the temperature selector and sensor signals acts on a vacuum modulator to generate an actuator pressure level which is sensed and a corresponding electrical signal used to null the temperature error signal, to provide a stabilizing feedback loop in the control system. A particular vacuum modulator structure is also disclosed in which a pair of heated bimetal actuator devices are utilized to control communication of a vent port and a source of vacuum pressure with an interior chamber, the resulting pressure communicated to the vacuum operated actuator. The heater circuit for the heated bimetals is controlled to develop the proper actuator pressure and also features an interrupted heater current mode of operation in which the heater current is interrupted after a predetermined deflection of the heated bimetals to thereby improve their response and to simplify the design thereof.
REFERENCES:
patent: 3059663 (1962-10-01), Whitenack
patent: 4063682 (1977-12-01), Orcutt
Bata George T.
Spiker Van P.
Freeh William L.
Haas, Jr. Gaylord P.
The Bendix Corporation
Wells Russel C.
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