Harold H Beekhuizen

US Patent:

7788056, Aug 31, 2010

Filed:

Sep 19, 2008

Appl. No.:

12/234306

Inventors:

Harold Beekhuizen - Tucson AZ, US
Tom Whitney - Tucson AZ, US

Assignee:

Honeywell International Inc. - Morristown NJ

International Classification:

G01L 27/00
G06G 7/00

US Classification:

702 98, 701 14

Abstract:

A method of auto-calibrating aircraft cabin pressure sensors in a cabin pressure control system while in service, wherein at a constant sensed cabin pressure during a cruise flight phase at least one pressure sensor output voltage from each of two cabin pressure sensors are recorded. Upon landing and opening of the cabin doors the sensed cabin pressure value is compared to an external field pressure. A new software slope variable and a new software offset variable are computed for the pressure/voltage function using an average computed pressure value in cruise and the recorded field atmospheric pressure sensor voltage value on the ground. Thereafter, a new cabin pressure value is calculated and control software is modified.

US Patent:

20030033884, Feb 20, 2003

Filed:

Aug 16, 2001

Appl. No.:

09/931474

Inventors:

Harold Beekhuizen - Tucson AZ, US
Armand Issaian - Tucson AZ, US
Charles Umeda - Tucson AZ, US

International Classification:

G01L009/12

US Classification:

073/718000

Abstract:

A capacitance pressure sensor includes a pressure diaphragm, an acceleration diaphragm, and a support member. The pressure diaphragm and acceleration diaphragm each include electrodes on surfaces that face each other, thereby forming a pressure sensitive capacitor. The pressure sensitive capacitor is coupled to the support member, which is in turn directly coupled to a base plate. The structure of the pressure sensor is simplified structure in that it includes no additional stress isolation components.