Trouble detection method, trouble detection apparatus, and temperature controller
AssigneeOMRON Corporation
InventorTakaaki Yamada
Life of this patent
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Abstract
First determination means 16 determines whether a deviation exceeds a threshold value, measurement means 17 measures the period in which the deviation exceeds the threshold value in accordance with the determination result, second determination means determines whether the period in which the deviation exceeds the threshold value continues for a certain period or more in accordance with the measurement result, third determination means 19 determines whether the absolute value of the deviation decreases, and trouble determination means 2 determines that a trouble occurs when the period in which the deviation exceeds the threshold value continues for a certain period or more and the absolute value of the deviation does not decrease.
Claims10
A trouble detection method for detecting a trouble in a control loop including control means for outputting a manipulated variable for a controlled system in accordance with a deviation between a process variable fed back from the controlled system and a target value, comprising:
- determining that a trouble occurs in the control loop when a measured period in which the deviation exceeds a first threshold value is greater than or equal to a second threshold value, the second threshold value corresponding to a duration of a certain period, and the deviation does not decrease within the measured period.
A trouble detection method for detecting a trouble in a control loop including control means for outputting a manipulated variable for a controlled system in accordance with a deviation between a process variable fed back from the controlled system and a target value, comprising:
- determining that a trouble occurs in the control loop when a measured period in which the deviation exceeds a first threshold value is greater than or equal to a second threshold value, the second threshold value corresponding to a duration of a certain period, and the absolute value of the deviation does not decrease within the measured period.
A trouble detection method for detecting a trouble in a control loop including control means for outputting a manipulated variable for a controlled system in accordance with a deviation between a process variable fed back from the controlled system and a target value, comprising:
- determining whether the deviation exceeds a first threshold value;
- measuring a period in which the deviation exceeds the first threshold value;
- determining whether the measured period exceeds a second threshold value, the second threshold value corresponding to a duration of a certain period;
- determining whether the absolute value of the deviation decreases;
- and
- determining that a trouble occurs in the control loop when the measured period exceeds the second threshold value corresponding to the duration of the certain period and the absolute value of the deviation does not decrease within the measured period.
A trouble detection apparatus for detecting a trouble in a control loop including control means for outputting a manipulated variable for a controlled system in accordance with a deviation between a process variable fed back from the controlled system and a target value, comprising:
- first determination means for determining whether the deviation exceeds a first threshold value;
- measurement means for measuring a period in which the deviation exceeds the first threshold value in accordance with a determination result by the first determination means;
- second determination means for determining whether the measured period in which the deviation exceeds the first threshold value is greater than or equal to a second threshold value, the second threshold value corresponding to a duration of a certain period in accordance with a measurement result by the measurement means;
- third determination means for determining whether the absolute value of the deviation decreases;
- and
- trouble determination means for determining that a trouble occurs in the control loop when the measured period in which the deviation exceeds the first threshold value is greater than or equal to the second threshold value corresponding to the duration of the certain period and the absolute value of the deviation does not decrease within the measured period in accordance with determination results by the second and third determination means.
A temperature controller comprising:
- control means for outputting a manipulated variable for a controlled system in accordance with a deviation between a process variable fed back from the controlled system and a target value;
- and
- trouble determination means for determining that a trouble occurs in a control loop when a measured period in which the deviation exceeds a first threshold value is greater than or equal to a second threshold value, the second threshold value corresponding to a duration of a certain period, and the deviation does not decrease within the measured period.
A temperature controller comprising:
- control means for outputting a manipulated variable for a controlled system in accordance with a deviation between a process variable fed back from the controlled system and a target value;
- and
- trouble determination means for determining that a trouble occurs in a control loop when a measured period in which the deviation exceeds a first threshold value is greater than or equal to a second threshold value, the second threshold value corresponding to a duration of a certain period, and the absolute value of the deviation does not decrease within the measured period.
A temperature controller comprising:
- a controller which outputs a manipulated variable for a controlled system in accordance with a deviation between a process variable fed back from the controlled system and a target value;
- and
- a trouble determination unit which determines that a trouble occurs in a control loop when a measured period in which the deviation exceeds a first threshold value is greater than or equal to a second threshold value, the second threshold value corresponding to a duration of a certain period, and the deviation does not decrease within the measured period.
Dependencies are inferred from the claim text.