Air conditioning system for motor vehicles

US5413528A · kind A · utility

Assignee

• AUDI AG · DE

Inventors

• Hans-Georg Pabst · Wittenberg, DE
• Holger Grossmann · Ingolstadt, DE
• Heinz Wiedemann
• Fritz Naumann · Stammham, DE

Key dates

• Filing date: Feb 8, 1991
• Grant date: May 9, 1995
• Expiry date: Feb 8, 2011

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60H1/247
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

Air conditioning (AC) system for motor vehicles comprising two fans connected in a series circuit whereby the first fan provides only a part of the air required for admission into the passenger compartment, and the remaining contribution to the desired quantity of air is provided by the second fan. Under normal operating conditions, where all openings such as windows, doors and sunroof (if any) are closed, both fans are independently regulated by a main controller device in such a manner that the air on the passenger compartment experiences a slight overpressure in order to permit the rapid entry and exit of air flow through the passenger compartment and a uniform air circulation therein. A manometer is included in the AC system to provide air pressure differential data (between the passenger compartment and the outside) to the main controller. The AC system also includes an AC program associated with a separate AC controller which are both subordinate to the main controller such that the excessive speed and related noise of each fan are greatly reduced. The independent control of each fan by the main controller results in ideal performance, even during the operating condition wher…