Apparatus and method for verifying operation of air data probes

Patent metadata

Field	Value
Publication number	US-10948511-B2
Application number	US-201815912497-A
Country	US
Kind code	B2
Filing date	Mar 5, 2018
Priority date	Mar 5, 2018
Publication date	Mar 16, 2021
Grant date	Mar 16, 2021

Abstract

A method, comprises: receiving measured air pressure data from each air data probe on a vehicle; receiving a first set of data from at least one sensor system on the vehicle; determining predicted noise levels for each air data probe using a noise modelling system and the received first set of data; determining a transmission loss for each air data probe; determining if any air data probe is faulty by determining if an transmission loss of any of the air data probes is greater than a first threshold value, where an air data probe is deemed faulty if its transmission loss is greater than the first threshold value; and if the transmission loss of any of the air data probes is greater than the first threshold value, then generating a signal to indicated that at least one air data probe is faulty.

First claim

What is claimed is:

1. A method, comprising:
receiving measured air pressure data, including a measured noise level over frequency from each air data probe on a vehicle, wherein the measured noise level is generated by a vehicle's propulsion system;
receiving a first set of data from at least one other sensor on the vehicle;
determining a predicted noise level over frequency for each air data probe with a noise modelling system using the received first set of data, wherein the noise modelling system comprises a noise model based upon air data probe design, vehicle's propulsion system characteristics, and other sensor type;
determining a difference between the predicted noise level and the measured noise level for each air data probe, wherein each air data probe is configured to measure total pressure or static pressure;
determining if any air data probe is faulty by determining if the determined difference of any air data probe is greater than a first threshold value, wherein an air data probe is deemed faulty if its difference between the predicted noise level and the measured noise level is greater than the first threshold value; and
if the determined difference between the predicted noise level and the measured noise level of any air data probe is greater than the first threshold value, then performing at least one of: (a) generation of a signal to alert at least one vehicle system that at least one air data probe is faulty, (b) generation of a signal to alert a crew of the vehicle that at least one air data probe is faulty, and (c) determination of a weighted average air pressure for all air data probes, wherein the measured air pressure data of any faulty air data probe has a lower weighting than air pressure data of any non-faulty air data probes.

2. The method of claim 1 , wherein determining the difference for each air data probe comprises determining the difference for each air data probe by at least one of: comparing noise level measurements, power spectral densities at given frequencies, and through fractional-octave analysis.

3. The method of claim 1 , further comprising receiving a second set of data from the at least one other sensor on the vehicle;
wherein the first set of data and the second set of data each comprise at least one of environmental data and vehicle state vector data; and
generating at least one noise model using the received second set of data.

4. The method of claim 3 , further comprising using the first set of data to modify the at least one noise model.

5. The method of claim 1 , wherein determining whether any air data probe is faulty further comprises analyzing at least one of:
a. the difference between the predicted noise level and the measured noise level for one or more air data probes at one or more frequencies and/or over one or more band(s);
b. a difference in the difference between the predicted noise level and the measured noise level of an air data probe at any two frequencies or over band(s);
c. the difference in measured noise levels of an air data probe at any two frequencies or over bands; and
d. the difference in measured noise levels of two or more air data probes at a frequency or band.

6. The method of claim 1 , wherein determining the weighted average air pressure for all air data probes comprises assigning weightings to faulty air data probes that are at least one of: (a) a fixed value lower than a fixed value assigned as a weighting to non-faulty air data probes, (b) a number of faulty air probes, and (c) a variable dependent upon an absolute value of the difference between the difference between the predicted noise level and the measured noise level and the first threshold value.

7. The method of claim 1 , wherein determining the difference for each air data probe comprises determining the difference for each air data probe in a mass controlled region bandwidth, wherein the mass controlled region bandwidth is a region where logarithmic difference between the predicted noise level and the measured noise level for an air data probe increases monotonically and linearly with logarithmic frequency.

8. A non-transitory computer readable medium storing a program causing at least one processor to execute a process, the process comprising:
receiving measured air pressure data, including a measured noise level over frequency from each air data probe on a vehicle, wherein the measured noise level is generated by a vehicle's propulsion system;
receiving a first set of data from at least one other sensor on the vehicle;
determining a predicted noise level over frequency for each air data probe with a noise modelling system using the received first set of data, wherein the noise modelling system comprises a noise model based upon air data probe design, vehicle's propulsion system characteristics, and other sensor type;
determining a difference between the predicted noise level and the measured noise level for each air data probe, wherein each air data probe is configured to measure total pressure or static pressure;
determining if any air data probe is faulty by determining if the determined difference of any of the air data probe is greater than a first threshold value, wherein an air data probe is deemed faulty if difference between the predicted noise level and the measured noise level is greater than the first threshold value; and
if the determined difference of any air data probe is greater than the first threshold value, then performing at least one of: (a) generation of a signal to alert at least one vehicle system that at least one air data probe is faulty, (b) generation of a signal to alert a crew of the vehicle that at least one air data probe is faulty, and (c) determination of a weighted average air pressure for all air data probes, wherein the measured air pressure data of any faulty air data probe has a lower weighting than air pressure data of any non-faulty air data probes.

9. The non-transitory computer readable medium of claim 8 , wherein determining the difference for each air data probe comprises determining the difference for each air data probe by at least one of: comparing noise level measurements, power spectral densities at given frequencies, and through fractional-octave analysis.

10. The non-transitory computer readable medium of claim 8 , the process further comprising receiving a second set of data from the at least one other sensor on the vehicle; and
generating at least one noise model using the received second set of data.

11. The non-transitory computer readable medium of claim 10 , the process further comprising using the first set of data to modify the at least one noise model.

12. The non-transitory computer readable medium of claim 8 , wherein determining whether any air data probe is faulty further comprises analyzing at least one of:
a. the difference between the predicted noise level and the measured noise level for one or more air data probes at one or more frequencies and/or over one or more band(s);
b. a difference in the difference between the predicted noise level and the measured noise level of an air data probe at any two frequencies or over band(s);
c. the difference in measured noise levels of an air data probe at any two frequencies or over bands; and
d. the difference in measured noise levels of two or more air data probes at a frequency or band.

13. The non-transitory computer readable medium of claim 8 , wherein determining the weighted average air pressure for all air data probes comprises assigning weightings to faulty air data probes that are at least one of: (a) a fixed value lower than a fixed value assigned as a weighting to non-faulty

Assignees

• Honeywell Int Inc

Inventors

• Gordon Grant
• Thotadakumbri Raviprakash
• Landree Eugene G
• Sand Merle L

Classifications

• G06F30/20

  Design optimisation, verification or simulation (optimisation, verification or simulation of circuit designs G06F30/30) · CPC title

• G01P21/025 Primary

  for measuring speed of fluids; for measuring speed of bodies relative to fluids (for measuring volume flow G01F25/10) · CPC title

• G01C25/00

  Manufacturing, calibrating, cleaning, or repairing instruments or devices referred to in the other groups of this subclass (testing, calibrating or compensating compasses G01C17/38) · CPC title

• G01R19/0038

  Circuits for comparing several input signals and for indicating the result of this comparison, e.g. equal, different, greater, smaller (comparing pulses or pulse trains according to amplitude) · CPC title

• G01L27/007

  Malfunction diagnosis, i.e. diagnosing a sensor defect · CPC title