Controller, cabin pressure control system and method of controlling cabin pressure

US6676504B2 · kind B2 · utility

Assignee

• Nord-Micro GmbH & Co. OHG · DE

Inventors

• Bernhard Petri · Hersbruck, DE
• Christian Felsch · Dortmund, DE
• Veit Albrecht · Heusenstamm, DE
• Lars Runkel · Glückstadt, DE

Key dates

• Filing date: Mar 20, 2002
• Grant date: Jan 13, 2004
• Expiry date: Jul 31, 2022

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T50/40
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

The present invention relates to a controller (11), a cabin pressure control system (10) and a method for controlling pressure in a cabin (30), especially an aircraft cabin. In accordance with the invention the controller (11) comprises a channel (15, 16) and a pressure differential safety function (22). The channel (15; 16) calculates a first output signal (40) for actuating an overflow valve (17) in a closed loop control based on the pressure differential between the cabin (30) and the atmosphere and additional critical parameters. The safety function (22) calculates a second output signal (41) based only on the pressure differential. The two output signals (40, 41) are compared, and the second output signal (41) is selected, if said first output signal (40) is found inaccurate. The safety function (22) assures operation of the outflow valve (17) even it the channel (15; 16) is out of function. Accordingly, the number of additional safety valves (18) may be reduced so that the weight of the system (10) is minimized. A manual control panel (26) is provided for backup.