IMPULSE LINE-CLOGGING DETECTING UNIT AND IMPULSE LINE-CLOGGING DETECTING METHOD
First Claim
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1. An impulse line-clog detecting apparatus comprising;
- a differential pressure detecting unit that detects a differential pressure of a fluid based on a high pressure transmitted via a high pressure side impulse line and a low pressure transmitted via a low pressure side impulse line, and outputs time-series data of the differential pressure;
a differential pressure fluctuation calculating unit that calculates a differential pressure fluctuation based on the time-series data of the differential pressure;
a fluctuation variance calculating unit that calculates a variance of the differential pressure fluctuation;
a variance ratio calculating unit that calculates a variance ratio of the differential pressure fluctuation variance calculated by the fluctuation variance calculating unit to a differential pressure fluctuation variance obtained in advance in a normal state of the high pressure side impulse line and the low pressure side impulse line;
a variance ratio connecting unit that calculates a correction value for suppressing change of the variance ratio, which is caused by change of a flow rate of the fluid, based on the differential pressure time-series data output from the differential pressure detecting unit and time-series data of the differential press obtained in advance in the normal state, and corrects the variance ratio based on the correction value; and
a clogging determining unit that determines whether the high pressure side impulse line and the low pressure side impulse line are clogged, based on the variance ratio corrected by the variance ratio correcting unit.
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Abstract
This impulse line-clogging detecting apparatus is provide with: a differential pressure detecting unit that detects a differential pressure of a fluid, and outputs time series data of the differential pressure; a differential pressure fluctuation calculating unit that calculates a differential pressure fluctuation; a fluctuation variance calculating unit that calculates a variance of the differential pressure fluctuation; a variance ratio calculating unit that calculates a variance ratio of the differential pressure fluctuation variance calculated by the fluctuation variance calculating unit to a differential pressure fluctuation variance obtained in advance in a normal state of the high and low pressure side impulse lines; a variance ratio correcting unit that calculates a correction value for suppressing change of the variance ratio; and a clogging determining unit that determines whether the high and low pressure side impulse lines are clogged, based on the variance ratio corrected by the variance ratio correcting unit.
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Citations
5 Claims
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1. An impulse line-clog detecting apparatus comprising;
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a differential pressure detecting unit that detects a differential pressure of a fluid based on a high pressure transmitted via a high pressure side impulse line and a low pressure transmitted via a low pressure side impulse line, and outputs time-series data of the differential pressure; a differential pressure fluctuation calculating unit that calculates a differential pressure fluctuation based on the time-series data of the differential pressure; a fluctuation variance calculating unit that calculates a variance of the differential pressure fluctuation; a variance ratio calculating unit that calculates a variance ratio of the differential pressure fluctuation variance calculated by the fluctuation variance calculating unit to a differential pressure fluctuation variance obtained in advance in a normal state of the high pressure side impulse line and the low pressure side impulse line; a variance ratio connecting unit that calculates a correction value for suppressing change of the variance ratio, which is caused by change of a flow rate of the fluid, based on the differential pressure time-series data output from the differential pressure detecting unit and time-series data of the differential press obtained in advance in the normal state, and corrects the variance ratio based on the correction value; and a clogging determining unit that determines whether the high pressure side impulse line and the low pressure side impulse line are clogged, based on the variance ratio corrected by the variance ratio correcting unit. - View Dependent Claims (2, 3, 4)
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5. An impulse line-clogging detecting method comprising:
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a first step of detecting a differential pressure of a fluid based on a high pressure transmitted via a high pressure side impulse line and a low pressure transmitted via a low pressure side impulse line, and outputting time-series data of the differential pressure; a second step of calculating differential pressure fluctuation based on the time-series data of the differential pressure; a third step of calculating a variance of the differential pressure fluctuation; a fourth step of calculating a variance ratio of the differential pressure fluctuation variance calculated in the third step to a differential pressure fluctuation variance obtained in advance in a normal state of the high and low pressure side impulse lines; a fifth step of calculating a correction value for suppressing Mange of the variance ratio, which is caused by change of a flow rate of the fluid, based on the differential pressure time-series data acquired in the first step and time-series daft of the differential pressure obtained in advance in the normal state; a sixth step of correcting the variance ratio based on the correction value; and a seventh step of determining whether the high pressure side impulse line and die low pressure side impulse line are clogged, based on the variance ratio corrected in the sixth step.
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Specification
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Current AssigneeYokogawa Electric Corporation
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Original AssigneeJyun-Ichi Eino, Takumi Hashizume, Tetsuya Wakui, Yokogawa Electric Corporation
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InventorsMiyaji, Nobuo, Yuki, Yoshitaka, Eino, Jyun-ichi, Wakui, Tetsuya, HASHIZUME, Takumi
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Granted Patent
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Time in Patent OfficeDays
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Field of Search
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US Class Current702/100
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CPC Class CodesG01F 1/50 Correcting or compensating ...
