Apparatus and method for detecting blockage of impulse lines

• US 7,406,387 B2
• Filed: 03/22/2007
• Issued: 07/29/2008
• Est. Priority Date: 03/27/2006
• Status: Active Grant

• Current Assignee: Jyun-Ichi Eino, Takumi Hashizume, Tetsuya Wakui, Yokogawa Electric Corporation
• Original Assignee: Jyun-Ichi Eino, Takumi Hashizume, Tetsuya Wakui, Yokogawa Electric Corporation
• Inventors: Hashizume, Takumi, Wakui, Tetsuya, Miyaji, Nobuo, Eino, Jyun-ichi
• Primary Examiner(s): Bui; Bryan
• Application Number:
  US11/723,855
• Publication Number:
  US 20070225924A1
• Time in Patent Office: 495 Days
• Field of Search: 702/98, 702/138, 702/45, 702/47, 702/50, 702/187, 702/189, 737/06, 737/07, 737/08, 340/611, 340/614
• US Class Current: 702/47
• CPC Class Codes: G01L 27/007 Malfunction diagnosis, i.e. diagnosing a sensor defect

Abstract

A detecting apparatus includes the following units. A pressure detecting unit detects in time series higher and lower static pressures and a differential pressure. Fluctuation calculating units calculate time series data sets of a differential pressure fluctuation, a higher static pressure fluctuation, and a lower static pressure fluctuation. Square sum calculating units calculate the square sum of the time series data sets of the differential pressure fluctuation, the square sum of the time series data sets of the higher static pressure fluctuation, and the square sum of the time series data sets of the lower static pressure fluctuation. A correlation coefficient calculating unit calculates first and second correlation coefficients. An intermediate variable calculating unit calculates an intermediate variable. A blockage rate calculating unit calculates a blockage rate. A determination unit determines a blockage of higher and lower pressure impulse lines with reference to the blockage rate.

Claims

1. An apparatus for detecting a blockage of an impulse line, the apparatus comprising:

a pressure detecting unit configured to detect in time series a higher static pressure that travels through a higher pressure impulse line and generate time series data sets of the higher static pressure, the pressure detecting unit being configured to detect in time series a lower static pressure that travels through a lower pressure impulse line and generate time series data sets of the lower static pressure, the pressure detecting unit being configured to detect in time series a differential pressure between the higher and lower pressure impulse lines and generate time series data sets of the differential pressure;

a first fluctuation calculating unit configured to calculate time series data sets of a differential pressure fluctuation based on the time series data sets of the differential pressure;

a second fluctuation calculating unit configured to calculate time series data sets of a higher static pressure fluctuation based on the time series data sets of the higher static pressure;

a third fluctuation calculating unit configured to calculate time series data sets of a lower static pressure fluctuation based on the time series data sets of the lower static pressure;

a first square sum calculating unit configured to calculate the square sum of the time series data sets of the differential pressure fluctuation;

a second square sum calculating unit configured to calculate the square sum of the time series data sets of the higher static pressure fluctuation;

a third square sum calculating unit configured to calculate the square sum of the time series data sets of the lower static pressure fluctuation;

a correlation coefficient calculating unit configured to calculate a first correlation coefficient based on the time series data sets of the differential pressure fluctuation, the time series data sets of the higher static pressure fluctuation, the square sum of the time series data sets of the differential pressure fluctuation, and the square sum of the time series data sets of the higher static pressure fluctuation, and the correlation coefficient calculating unit being configured to calculate a second correlation coefficient based on the time series data sets of the differential pressure fluctuation, the time series data sets of the lower static pressure fluctuation, the square sum of the time series data sets of the differential pressure fluctuation, and the square sum of the time series data sets of the lower static pressure fluctuation;

an intermediate variable calculating unit configured to calculate an intermediate variable based on the first and second correlation coefficients;

a blockage rate calculating unit configured to calculate a blockage rate based on the intermediate variable; and

a determination unit configured to determine a blockage of each of the higher and lower pressure impulse lines with reference to the blockage rate.

5. The apparatus for detecting a blockage of an impulse line according to claim 1, wherein the determining of the blockage of the higher pressure impulse line includes comparing the blockage rate to a first threshold and the determining of the blockage of the lower pressure impulse line includes comparing the blockage rate to a second threshold.

9. The apparatus for detecting a blockage of an impulse line according to claim 1, wherein the determination unit is configured to determine the blockage of each of the higher and lower pressure impulse lines based on the blockage rate.

2. An apparatus for detecting a blockage of an impulse line, the apparatus comprising:

a pressure detecting unit configured to detect in time series a higher static pressure that travels through a higher pressure impulse line and generate time series data sets of the higher static pressure, the pressure detecting unit being configured to detect in time series a lower static pressure that travels through a lower pressure impulse line and generate time series data sets of the lower static pressure;

a first fluctuation calculating unit configured to calculate time series data sets of a higher static pressure fluctuation based on the time series data sets of the higher static pressure;

a second fluctuation calculating unit configured to calculate time series data sets of a lower static pressure fluctuation based on the time series data sets of the lower static pressure;

a first square sum calculating unit configured to calculate the square sum of the time series data sets of the higher static pressure fluctuation;

a second square sum calculating unit configured to calculate the square sum of the time series data sets of the lower static pressure fluctuation;

a ratio calculating unit configured to calculate a ratio of the square sum of the time series data sets of the higher static pressure fluctuation to the square sum of the time series data sets of the lower static pressure fluctuation;

a blockage rate calculating unit configured to calculate a blockage rate based on the ratio; and

a determination unit configured to determine a blockage of each of the higher and lower pressure impulse lines with reference to the blockage rate.

6. The apparatus for detecting a blockage of an impulse line according to claim 2, wherein the determining of the blockage of the higher pressure impulse line includes comparing the blockage rate to a first threshold and the determining of the blockage of the lower pressure impulse line includes comparing the blockage rate to a second threshold.

10. The apparatus for detecting a blockage of an impulse line according to claim 2, wherein the determination unit is configured to determine the blockage of each of the higher and lower pressure impulse lines based on the blockage rate.

3. A method of detecting a blockage of an impulse line, the method comprising:

detecting in time series a higher static pressure that travels through a higher pressure impulse line to generate time series data sets of the higher static pressure;

detecting in time series a lower static pressure that travels through a lower pressure impulse line to generate time series data sets of the lower static pressure;

detecting in time series a differential pressure between the higher and lower pressure impulse lines to generate time series data sets of the differential pressure;

calculating time series data sets of a differential pressure fluctuation based on the time series data sets of the differential pressure;

calculating time series data sets of a higher static pressure fluctuation based on the time series data sets of the higher static pressure;

calculating time series data sets of a lower static pressure fluctuation based on the time series data sets of the lower static pressure;

calculating the square sum of the time series data sets of the differential pressure fluctuation;

calculating the square sum of the time series data sets of the higher static pressure fluctuation;

calculating the square sum of the time series data sets of the lower static pressure fluctuation;

calculating a first correlation coefficient based on the time series data sets of the differential pressure fluctuation, the time series data sets of the higher static pressure fluctuation, the square sum of the time series data sets of the differential pressure fluctuation, and the square sum of the time series data sets of the higher static pressure fluctuation;

calculating a second correlation coefficient based on the time series data sets of the differential pressure fluctuation, the time series data sets of the lower static pressure fluctuation, the square sum of the time series data sets of the differential pressure fluctuation, and the square sum of the time series data sets of the lower static pressure fluctuation;

calculating an intermediate variable based on the first and second correlation coefficients;

calculating a blockage rate based on the intermediate variable; and

determining a blockage of each of the higher and lower pressure impulse lines with reference to the blockage rate.

7. The method of detecting a blockage of impulse line according to claim 3, wherein the determining of the blockage of the higher pressure impulse line includes comparing the blockage rate to a first threshold and the determining of the blockage of the lower pressure impulse line includes comparing the blockage rate to a second threshold.

11. The method of detecting a blockage of an impulse line according to claim 3, wherein determining the blockage of each of the higher and lower pressure impulse lines includes determining the blockage of each of the higher and lower pressure impulse lines based on the blockage, rate.

4. A method of detecting a blockage of an impulse line, the method comprising:

detecting in time series a higher static pressure that travels through a higher pressure impulse line to generate time series data sets of the higher static pressure,

detecting in time series a lower static pressure that travels through a lower pressure impulse line to generate time series data sets of the lower static pressure;

calculating time series data sets of a higher static pressure fluctuation based on the time series data sets of the higher static pressure;

calculating time series data sets of a lower static pressure fluctuation based on the time series data sets of the lower static pressure;

calculating the square sum of the time series data sets of the higher static pressure fluctuation;

calculating the square sum of the time series data sets of the lower static pressure fluctuation;

calculating a ratio of the square sum of the time series data sets of the higher static pressure fluctuation to the square sum of the time series data sets of the lower static pressure fluctuation;

calculating a blockage rate based on the ratio; and

determining a blockage of each of the higher and lower pressure impulse lines with reference to the blockage rate.

8. The method of detecting a blockage of impulse line according to claim 4, wherein the determining of the blockage of the higher pressure impulse line includes comparing the blockage rate to a first threshold and the determining of the blockage of the lower pressure impulse line includes comparing the blockage rate to a second threshold.

12. The method of detecting a blockage of an impulse line according to claim 4, wherein determining the blockage of each of the higher and lower pressure impulse lines includes determining the blockage of each of the higher and lower pressure impulse lines based on the blockage rate.