CN112179457A - Fault detection and reconstruction method for liquid level system of water-cooling cabinet - Google Patents
Fault detection and reconstruction method for liquid level system of water-cooling cabinet Download PDFInfo
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- CN112179457A CN112179457A CN202011046545.8A CN202011046545A CN112179457A CN 112179457 A CN112179457 A CN 112179457A CN 202011046545 A CN202011046545 A CN 202011046545A CN 112179457 A CN112179457 A CN 112179457A
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- 239000007788 liquid Substances 0.000 title claims abstract description 80
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000001816 cooling Methods 0.000 title claims abstract description 20
- 238000001514 detection method Methods 0.000 title claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- 238000011897 real-time detection Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 3
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/20—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of apparatus for measuring liquid level
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B23/00—Testing or monitoring of control systems or parts thereof
- G05B23/02—Electric testing or monitoring
- G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
- Control Of Non-Electrical Variables (AREA)
Abstract
The invention relates to a fault detection and reconstruction method for a liquid level system of a water-cooling cabinet, which judges whether a liquid level meter has a fault or not according to a feedback signal of the liquid level meter and feedback signals of other sensors, and further analyzes whether the sensor is damaged or drifted on the basis of the fault; when the liquid level meter is detected to be out of order, a new liquid level meter signal is constructed through the pressure sensor and the flow sensor, so that the water circulation system can continue to operate, and the liquid level meter which is out of order is replaced after the operation of the equipment is finished.
Description
Technical Field
The invention belongs to the technical field of fault detection and protection of water-cooling cabinets.
Background
Liquid level control systems are used in large quantities in industrial production, such as industrial field liquid level measurement control, oil tank liquid level control, cooling system liquid level monitoring, drinking water and sewage treatment, etc. The main sensor is a liquid level meter, and generally, the fault discovery of the sensor in the industry can be found only by manual overhaul. The liquid level meter plays an important role in a water-cooling cabinet system, when the liquid level is too low, enough circulating water cannot be provided for cooling a heating component, and the situation that a water tank is electrically heated and dried can occur. Meanwhile, the liquid level meter is a sensor which is easy to break down, and when the sensor breaks down, the circulating system stops running. Therefore, when the liquid level meter is out of order, the failure needs to be detected quickly and the normal operation of the system needs to be ensured through a fault-tolerant control method.
The existing fault detection and fault tolerance control method for the signals of the liquid level meter is complex and difficult to realize in engineering. If a Kalman filtering method, a fuzzy expert system and a state observer method are adopted for fault diagnosis; when the system is protected, fault tolerance is carried out on the system by adopting methods such as multi-model active fault-tolerant control, robust reconstruction and the like; there are also methods that employ hardware redundancy, enabling a backup level gauge when a fault is detected. The detection and protection methods realize fault detection and system protection through complex formulas and models, but are not easy to realize in engineering application.
Disclosure of Invention
The invention provides a method for detecting and reconstructing faults of a liquid level system of a liquid cooling cabinet under the condition that the liquid level meter of the liquid cooling cabinet has faults.
The invention discloses a fault detection and signal reconstruction method for a liquid level meter of a water-cooling cabinet, which comprises the following steps of:
the method comprises the following steps: comprehensively judging whether the liquid level meter has faults or not according to three signals, namely a feedback signal h, a pressure signal p and a flow signal Q of the liquid level meter;
step two: when the liquid level meter is judged to have a fault, the water-cooling cabinet control unit receives a fault signal, and the system switches the signal of the liquid level meter; if no fault occurs, returning to the step I for real-time detection;
step three: reconstructing a liquid level meter signal according to a pressure signal in the system and a flow signal of a water inlet and a water outlet, and calling a unit to be controlled;
step four: and (4) accessing the reconstructed liquid level meter signal into a control system to realize the normal operation of the system.
The invention has the advantages that: when the liquid level meter of the water-cooling cabinet breaks down, the fault detection can be rapidly carried out, the signal protection system of the liquid level meter is reconstructed to continue to operate, and the fault tolerance of the system is improved. When the flow sensor and the pressure sensor are adopted, the original signals in the system do not need to change the hardware design of the system; and the calculation method of the reconstructed signal is simple and easy to implement, and is convenient for programming programs, and the method is convenient for being widely applied to the water-cooling cabinet.
Drawings
FIG. 1 is a schematic diagram of a water-cooled cabinet circulation system.
FIG. 2 is a schematic view of an operation procedure of a fault detection and reconstruction method for a liquid level system of a water-cooling cabinet.
FIG. 3 is a schematic diagram of a control mode of a fault detection and reconstruction method for a water-cooling cabinet liquid level system.
Detailed Description
The method of the present invention is further illustrated with reference to the figures and examples.
The invention provides a fault detection and reconstruction method for a liquid level system of a water-cooling cabinet, which comprises the following steps:
the method comprises the following steps: comprehensively judging whether the liquid level meter has faults or not according to three signals, namely a feedback signal h, a pressure signal p and a flow signal Q of the liquid level meter;
step two: when the liquid level meter is judged to have a fault, the water-cooling cabinet control unit receives a fault signal, and the system switches the signal of the liquid level meter; if no fault occurs, returning to the step I for real-time detection;
step three: reconstructing a liquid level meter signal according to a pressure signal in the system and a flow signal of a water inlet and a water outlet, and calling a unit to be controlled;
step four: and (4) accessing the reconstructed liquid level meter signal into a control system to realize the normal operation of the system.
Wherein, further, the process of judging the fault by the liquid level meter in the step one can be carried out by adopting the following processes: the water cooling circulation system is shown in figure 1, and the main sensors are a liquid level signal h, a water outlet pressure signal p and a water inlet flow signal Q1The water outlet flow signal is Q2. According to the feedback signal h of the liquid level meter, if the feedback signal is always at 0 or the maximum value and the value is not changed when the liquid level changes, the liquid level meter can be judged to be damaged; under the condition of no liquid leakage and liquid adding, the feedback signal h when the system is not in operation is obviously increased or decreased within a period of time, and the signal sending of the liquid level meter can be judgedDrift occurs; under the condition that the signals of the liquid level meter are in fault, the signals of the flow meter and the pressure sensor have no great difference with the signals of the flow meter and the pressure sensor when the circulating system runs, the fault of the liquid level meter in the system can be judged, and other sensors are normal and have the condition of reconstructing the signals of the liquid level meter.
Further, the process of reconstructing the signal of the liquid level meter by using the pressure signal and the flow signal of the water inlet and the water outlet in the step three can be performed by adopting the following processes: the control schematic diagram of the system is shown in figure 3, when a liquid level meter fault is detected, the control unit opens the selector switch according to a fault signal, and replaces the original liquid level meter signal with a reconstructed liquid level meter signal. Firstly, when the water pump is not started, calculating an initial value h of the liquid level of the water outlet tank according to a formula p ═ ρ gh0(ii) a Secondly, after the water pump is started, the flow signal of the water inlet and the water outlet is Q1、Q2According to the formula
Calculating the variable quantity of the liquid level of the water outlet tank, wherein S is the cross sectional area of the water tank; finally, h is given according to the formula0And calculating a real-time signal of the liquid level of the water outlet tank by the delta h.
Claims (3)
1. A fault detection and reconstruction method for a liquid level system of a water-cooling cabinet is characterized by comprising the following steps:
the method comprises the following steps: comprehensively judging whether the liquid level meter has faults or not according to three signals, namely a feedback signal h, a pressure signal p and a flow signal Q of the liquid level meter;
step two: when the liquid level meter is judged to have a fault, the water-cooling cabinet control unit receives a fault signal, and the system switches the signal of the liquid level meter; if no fault occurs, returning to the step I for real-time detection;
step three: reconstructing a liquid level meter signal according to a pressure signal in the system and a flow signal of a water inlet and a water outlet, and calling a unit to be controlled;
step four: and (4) accessing the reconstructed liquid level meter signal into a control system to realize the normal operation of the system.
2. The fault detection and reconstruction method for the liquid level system of the water-cooled cabinet according to claim 1, wherein the fault detection and reconstruction method comprises the following steps: the method for judging whether the liquid level meter has faults in the first step comprises the following steps: according to the feedback signal h of the liquid level meter, if the feedback signal is always at 0 or the maximum value and the value is not changed when the liquid level changes, the liquid level meter can be judged to be damaged; under the condition of no liquid leakage and liquid adding, the value of a feedback signal h when the system does not operate changes by more than ten percent within a period of time, and the signal of the liquid level meter can be judged to drift; under the condition that the signals of the liquid level meter are in fault, signals of the flow meter and the pressure sensor are not more than five percent of the change compared with the signals of the flow meter and the pressure sensor, the fault of the liquid level meter in the system can be judged, and other sensors are normal.
3. The fault detection and reconstruction method for the liquid level system of the water-cooled cabinet according to claim 1, wherein the fault detection and reconstruction method comprises the following steps: the method for reconstructing the signals of the liquid level meter in the third step comprises the following steps: when the system is not in operation, the initial value h of the liquid level meter is calculated by the pressure sensor0And then, calculating the change value delta h of the liquid level meter according to the flow meters at the inlet and the outlet, and finally calculating the real-time signal of the liquid level meter.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113310546A (en) * | 2021-04-02 | 2021-08-27 | 中国船舶重工集团公司第七0三研究所 | Water level measuring method for steam ship condenser with fuzzification compensation |
| CN114460910A (en) * | 2021-12-31 | 2022-05-10 | 浙江中控技术股份有限公司 | DCS-based analog quantity change judgment method, DCS-based analog quantity change judgment equipment and storage medium |
| CN116766980A (en) * | 2023-08-17 | 2023-09-19 | 太原科技大学 | Liquid cooling heat dissipation charging pile for liquid leakage early warning and early warning method |
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2020
- 2020-09-29 CN CN202011046545.8A patent/CN112179457A/en active Pending
Patent Citations (6)
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| JP2003044124A (en) * | 2001-07-27 | 2003-02-14 | Kaneko Sangyo Kk | Magnet float type level indicator fault diagnostic device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113310546A (en) * | 2021-04-02 | 2021-08-27 | 中国船舶重工集团公司第七0三研究所 | Water level measuring method for steam ship condenser with fuzzification compensation |
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| CN116766980B (en) * | 2023-08-17 | 2023-10-27 | 太原科技大学 | Liquid cooling heat dissipation charging pile for liquid leakage early warning and early warning method |
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