METHOD FOR DIAGNOSING A FAULT IN AN AIR-CONDITIONING PACK OF AN AIRCRAFT

• US 20170060125A1
• Filed: 02/21/2014
• Published: 03/02/2017
• Est. Priority Date: 02/21/2014
• Status: Active Grant

• Current Assignee: Taleris Global LLP
• Original Assignee: Taleris Global LLP
• Inventors: Beaven, Frank, Howard, Julia Ann, Horabin, Robert William
• Granted Patent: US 10,228,687 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B64D 13/06 the air being conditioned pressurising B64D13/02
• CPC Class Codes: B64D 13/08 the air being heated or cooled
• CPC Class Codes: B64D 2013/0618 with arrangements for reducing or managing bleed air, using another air source, e.g. ram air
• CPC Class Codes: G05B 23/0235 based on a comparison with predetermined threshold or range, e.g. "classical methods", carried out during normal operation; threshold adaptation or choice; when or how to compare with the threshold
• CPC Class Codes: G07C 5/0816 Indicating performance data, e.g. occurrence of a malfunction

Abstract

A method of diagnosing a fault in an air-conditioning pack of an aircraft is disclosed, wherein the air-conditioning pack includes one or more sensors. The method includes transmitting data from at least one of the sensors operably coupled to the air-conditioning pack, comparing the transmitted data to a predetermined threshold, and diagnosing a fault in the air-conditioning pack based on the comparison.

Claims

1. A method of diagnosing a fault in an air-conditioning pack of an aircraft where the air-conditioning pack includes one or more sensors outputting data related to air-conditioning pack temperature, air-conditioning pack pressure, or air-conditioning pack valve position, the method comprising:

transmitting data from at least one of the sensors operably coupled to the air-conditioning pack during one of a pre-flight, a post-flight, or a longest cruise;

comparing the transmitted data to a predetermined threshold;

diagnosing, by a controller, a fault in the air-conditioning pack based on the comparison; and

providing an indication of the diagnosed fault.

2. The method of claim 1, wherein transmitting the data comprises transmitting data during the pre-flight, the post-flight, and the longest cruise.

3. The method of claim 1, wherein transmitting the data comprises transmitting data from a plurality of flights.

4. The method of claim 3, wherein diagnosing the fault comprises diagnosing the fault when the comparisons indicate thresholds are satisfied over multiple flights.

5. The method of claim 1 wherein the controller utilizes an algorithm to diagnose the fault.

6. The method of claim 5, wherein the algorithm utilized to diagnose the fault differs for data transmitted in cruise and data transmitted on the ground.

7. The method of claim 1, wherein diagnosing the fault comprises diagnosing the fault with a ram air inlet flap actuator when the comparison indicates a position of the inlet flap does not satisfy the predetermined threshold during cruise.

8. The method of claim 1, wherein the transmitted data is related to multiple sensor readings of the air-conditioning pack.

9. The method of claim 8, wherein diagnosing the fault is based on multiple comparisons of the transmitted data to predetermined thresholds.

10. The method of claim 9, wherein diagnosing the fault comprises diagnosing a fault of a primary heat exchanger of the air-conditioning pack when the comparisons indicate a water extractor temperature above the predetermined threshold and a compressor outlet temperature above the predetermined threshold.

11. The method of claim 9, wherein diagnosing the fault comprises diagnosing a fault of a condenser of the air-conditioning pack when the comparisons indicate a compressor outlet temperature above the predetermined threshold and a water extractor temperature that satisfies the predetermined threshold.

12. The method of claim 9, wherein diagnosing the fault comprises diagnosing the fault of a RAM air actuator of the air-conditioning pack when the comparisons indicate RAM air inlet flaps are greater than the predetermined threshold and a pack outlet temperature is low or erratic.

13. The method of claim 9, wherein diagnosing the fault comprises diagnosing the fault of a trim air valve of the air-conditioning pack when the comparisons indicate cabin temperatures do not satisfy the predetermined threshold.

14. The method of claim 1, wherein the predetermined threshold is determined from flow rate data transmitted from another air-conditioning pack of the aircraft.

15. The method of claim 14, wherein diagnosing the fault comprises diagnosing the fault with a controller of the air-conditioning pack when the comparisons indicate a divergence in flow between the two air-conditioning packs of the aircraft.

16. The method of claim 2, wherein transmitting the data comprises transmitting data from a plurality of flights.

17. The method of claim 10, wherein diagnosing the fault comprises diagnosing a fault of a condenser of the air-conditioning pack when the comparisons indicate a compressor outlet temperature above the predetermined threshold and a water extractor temperature that satisfies the predetermined threshold.

18. The method of claim 10, wherein diagnosing the fault comprises diagnosing the fault of a RAM air actuator of the air-conditioning pack when the comparisons indicate RAM air inlet flaps are greater than the predetermined threshold and a pack outlet temperature is low or erratic.

19. The method of claim 10, wherein diagnosing the fault comprises diagnosing the fault of a trim air valve of the air-conditioning pack when the comparisons indicate cabin temperatures do not satisfy the predetermined threshold.

20. The method of claim 11, wherein diagnosing the fault comprises diagnosing the fault of a trim air valve of the air-conditioning pack when the comparisons indicate cabin temperatures do not satisfy the predetermined threshold.