Ventilation – Vehicle – Pressure regulation
Patent
1991-02-08
1995-05-09
Joyce, Harold
Ventilation
Vehicle
Pressure regulation
454141, B60H 124
Patent
active
054135281
DESCRIPTION:
BRIEF SUMMARY
FIELD
The invention relates to a method and apparatus for improving the operation and performance of an automotive air conditioning system of the type having two fans connected in a series circuit, including a first fan disposed in the dashboard area and a second fan disposed adjacent the rear vent openings of the automobile compartment. More particularly, the invention relates to a method and apparatus for providing an intelligent dual fan, serially connected air conditioning system which automatically adjusts to changing pressure conditions within the automobile chassis and whereby the noise generated from the fans is greatly reduced.
BACKGROUND
The typical air conditioning unit found in most automobiles comprises of a heating and/or ventilating fan in the dashboard region and includes a manifold for directing hot or cold air out through various openings above and/or below the dashboard. Examples of air conditioning units providing an additional second fan are disclosed and described in DE-OS 33 04 575 and DE-OS 30 43 934.
The air conditioning unit described in DE-OS 33 04 575 places an additional fan in the rear region Of the passenger compartment and is mounted to the existing rear vent opening located therein. The additional fan is provided to achieve a faster air exchange by exhausting interior air from the passenger compartment to the outside ambient atmosphere.
DE-OS 30 43 934 teaches to provide a second fan (in addition to a first fan housed in a conventional manner in the dash board) behind the back passenger seat to provide a uniform air circulation within the passenger compartment.
The addition of a second fan for the improvement of the operation of automotive air conditioning systems typically involves a trade off in driver (and passenger) comfort. For an air conditioning system employing two fans to perform adequately at higher vehicular speeds, the fans must be operated at their performance limits. This results in an undesirable increase in the amount of fan noise perceived by the driver and passengers. The undesirable fan noise is only compounded by the addition of a second fan in the rearward regions of the passenger compartment.
Therefore, there is a definite need in the art to provide a quiet air conditioning system having the advantages of quick air exchange between exterior and interior air and which provides uniform air circulation in the passenger compartment. There is also a need in the art to provide an improved dual fan air conditioning system whereby the noise generated by the fans is greatly reduced, and where the system is intelligent such that the fans recognize a sudden change in the passenger compartment air pressure (such as a sudden pressure drop in response to an opened window) and do not attempt to operate near their performance limits in order to keep the passenger compartment pressurized.
THE INVENTION
OBJECTS
It is among the objects of the present invention to provide a method and apparatus for operation of an automotive air conditioning system having a second additional fan placed adjacent the rear vent openings of the passenger compartment to provide for quick air exchange and uniform air circulation;
It is another object of the present invention to provide a method and apparatus for an improved dual fan, serially connected automobile air conditioning system whereby the noise generated by the fans is greatly reduced under all operating conditions;
It is another object of the present invention to provide a method and apparatus for an improved dual fan, serially connected automotive air conditioning system whereby an independent controller is provided to control the output of the two fans by determining the pressure difference between the interior passenger compartment and the outside ambient atmosphere;
It is still another object of the present invention to provide a method and apparatus for an improved dual fan, serially connected automotive air conditioning system which has an air conditioning program to specify the air quantity and is subordinate to the
REFERENCES:
patent: 4581988 (1986-04-01), Mattei
patent: 4788903 (1988-12-01), Johnson
Patent Abstract of Japan, 60-2520, Dec. 1985.
Grossmann Holger
Naumann Fritz
Pabst Hans G.
Wiedemann Heinz
Audi AG
Dulin Jacques M.
Joyce Harold
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