Refrigeration – Automatic control – Responsive to vehicle body motion or traction
Patent
1981-12-17
1984-07-31
Freeh, William L.
Refrigeration
Automatic control
Responsive to vehicle body motion or traction
417 45, B60H 300, F04B 4906
Patent
active
044622171
ABSTRACT:
Disclosed is a method for controlling the volume of a fluid, e.g., air, moving through a duct system, e.g., a ventilating system for a vehicle, comprising the steps of moving the fluid through an inlet of the duct system under dynamic pressure; conducting the fluid through the duct system by means of propulsion system driven by an electric motor, wherein the electric current drawn by said motor varies with changes in the dynamic pressure; and adjusting the amount of fluid admitted into the duct system in response to the current drawn by the motor and thus, also responsive to the dynamic pressure, this adjusting step thereby maintaining a constant volume of fluid moving through the air duct system. Also disclosed is an apparatus for carrying out this method.
REFERENCES:
patent: 1783036 (1930-11-01), Crawford
patent: 3441200 (1969-04-01), Huesgen
patent: 3945308 (1976-03-01), Jakimowicz
patent: 4044287 (1977-08-01), Ratzel
patent: 4108575 (1978-08-01), Schal
patent: 4205944 (1980-06-01), Rohrberg et al.
patent: 4225289 (1980-09-01), Burkett
Freeh William L.
Sueddeutsche Kuehlerfabrik Julius Fr. Behr GmbH & Co. KG
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