Sensing events affecting liquid flow in a liquid distribution system
First Claim
1. A method for monitoring a flow of a liquid in a distribution system within a structure, the method comprising:
- monitoring pressure at a first point in the distribution system, producing an output signal indicative of the pressure in the distribution system;
detecting liquid-related events occurring in the distribution system based upon one or more changes in the pressure indicated by the output signal; and
identifying a specific type of the liquid-related events that has been detected, from among two or more different types of events, by comparing characteristics of the output signal with one or more determinative criteria associated with the two or more different types of events, wherein;
when two or more different valves are coupled to the distribution system, detecting the liquid-related events comprises;
using the output signal to detect a change in a state of a valve of the two or more different valves; and
the change in the state of the valve occurs when the valve opens more or closes more;
one or more of the two or more different valves is associated with a specific fixture from among two or more different fixtures, the two or more different fixtures are coupled to the distribution system; and
the method further comprises;
identifying the specific fixture with which the valve of the two or more different valves that has changed state is associated.
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Accused Products
Abstract
By monitoring pressure transients in a liquid within a liquid distribution system using only a single sensor, events such as the opening and closing of valves at specific fixtures are readily detected. The sensor, which can readily be coupled to a faucet bib, transmits an output signal to a computing device. Each such event can be identified by the device based by comparing characteristic features of the pressure transient waveform with previously observed characteristic features for events in the system. These characteristic features, which can include the varying pressure, derivative, and real Cepstrum of the pressure transient waveform, can be used to select a specific fixture where a valve open or close event has occurred. Flow to each fixture and leaks in the system can also be determined from the pressure transient signal. A second sensor disposed at a point disparate from the first sensor provides further event information.
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Citations
44 Claims
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1. A method for monitoring a flow of a liquid in a distribution system within a structure, the method comprising:
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monitoring pressure at a first point in the distribution system, producing an output signal indicative of the pressure in the distribution system; detecting liquid-related events occurring in the distribution system based upon one or more changes in the pressure indicated by the output signal; and identifying a specific type of the liquid-related events that has been detected, from among two or more different types of events, by comparing characteristics of the output signal with one or more determinative criteria associated with the two or more different types of events, wherein; when two or more different valves are coupled to the distribution system, detecting the liquid-related events comprises; using the output signal to detect a change in a state of a valve of the two or more different valves; and the change in the state of the valve occurs when the valve opens more or closes more; one or more of the two or more different valves is associated with a specific fixture from among two or more different fixtures, the two or more different fixtures are coupled to the distribution system; and the method further comprises; identifying the specific fixture with which the valve of the two or more different valves that has changed state is associated. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for monitoring a flow of a liquid in a distribution system within a structure, the method comprising:
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monitoring pressure at a first point in the distribution system, producing an output signal indicative of the pressure in the distribution system; detecting liquid-related events occurring in the distribution system based upon one or more changes in the pressure indicated by the output signal; and identifying a specific type of the liquid-related events that has been detected, from among two or more different types of events, by comparing characteristics of the output signal with one or more determinative criteria associated with the two or more different types of events, wherein; the distribution system is coupled to two or more fixtures; and identifying the specific type of the liquid-related events that has been detected comprises; determining a predefined transient pressure wave signature for each of the two or more fixtures; storing the predefined transient pressure wave signatures; comparing a transient pressure wave signature indicated by the output signal to the predefined transient pressure wave signatures for the two or more fixtures; and identifying a specific one of the two or more fixtures where the flow of the liquid has changed by identifying the specific one of the two or more fixtures having the predefined transient pressure wave signature that most closely matches the transient pressure wave signature indicated by the output signal, and based upon a location of the specific one of the two or more fixtures in the distribution system. - View Dependent Claims (12, 13)
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14. A method for monitoring a flow of a liquid in a distribution system within a structure, the method comprising:
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monitoring pressure at a first point in the distribution system, producing an output signal indicative of the pressure in the distribution system; detecting liquid-related events occurring in the distribution system based upon one or more changes in the pressure indicated by the output signal; and identifying a specific type of the liquid-related events that has been detected, from among two or more different types of events, by comparing characteristics of the output signal with one or more determinative criteria associated with the two or more different types of events, wherein; identifying the specific type of the liquid-related event that has been detected comprises; segmenting the output signal to isolate one or more discrete events, based on pressure changes in the distribution system; classifying each discrete event of the one or more discrete events that is detected as either a valve open or a valve close event, wherein the valve open event corresponds to a valve opening more, and the valve close event corresponds to a valve closing more; and classifying each valve open and valve close event according to a specific fixture that generated it, the specific fixture is coupled to the distribution system. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A system for monitoring a flow of a liquid in a distribution system within a structure, comprising:
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a first pressure sensor that is adapted to connect to a distribution system to sense a pressure of the liquid in the distribution system; a controller coupled to the first pressure sensor, the controller is configured to control sensing of the pressure by the first pressure sensor and to provide an output signal that is indicative of the pressure sensed by the first pressure sensor; and a communication link that is coupled to the controller to receive the output signal and to communicate the output signal to a computing device, wherein the computing device includes; a memory configured to store machine executable instructions; and a processor coupled to the memory for executing the machine executable instructions, which causes the processor to carry out two or more functions when the first pressure sensor is connected to the distribution system, including; detecting liquid-related events occurring in the distribution system based upon one or more changes in the pressure indicated by the output signal; and identifying a specific type of the liquid-related events that has been detected from among two or more different types of events, by comparing one or more characteristics of the output signal with one or more determinative criteria associated with the two or more different types of events, wherein; the distribution system comprises two or more different valves; when the first pressure sensor is coupled to the distribution system, execution of the machine executable instructions by the processor further causes the processor to employ the output signal to detect a change in a state of a valve of the two or more different valves; and the change in the state occurs when the valve opens more or closes more; the distribution system further comprises two or more different fixtures; the valve of the two or more different valves is associated with a specific fixture of the two or more different fixtures; and when the first pressure sensor is coupled to the distribution system, execution of the machine executable instructions by the processor further causes the processor to identify the specific fixture of the two or more different fixtures with which the valve of the two or more different valves that has changed state is associated. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31)
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32. A system for monitoring a flow of a liquid in a distribution system within a structure, comprising:
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a first pressure sensor that is adapted to connect to a distribution system to sense a pressure of the liquid in the distribution system; a controller coupled to the first pressure sensor, the controller configured to control sensing of the pressure by the first pressure sensor and to provide an output signal that is indicative of the pressure sensed by the first pressure sensor; and a communication link that is coupled to the controller to receive the output signal and to communicate the output signal to a computing device, wherein the computing device includes; a memory configured to store machine executable instructions; and a processor coupled to the memory for executing the machine executable instructions, which causes the processor to carry out two or more functions when the first pressure sensor is connected to the distribution system, including; detecting liquid-related events occurring in the distribution system based upon one or more changes in the pressure indicated by the output signal; and identifying a specific type of the liquid-related events that has been detected from among two or more different types of events, by comparing one or more characteristics of the output signal with one or more determinative criteria associated with the two or more different types of events, wherein; when the first pressure sensor is coupled to the distribution system, execution of the machine executable instructions by the processor further causes the processor to determine a volumetric flow rate in the distribution system as a function of the output signal and a predefined flow resistance for the distribution system. - View Dependent Claims (33, 34, 35, 36)
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37. A system for monitoring a flow of a liquid in a distribution system within a structure, comprising:
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a first pressure sensor that is adapted to connect to a distribution system to sense a pressure of the liquid in the distribution system; a controller coupled to the first pressure sensor, the controller configured to control sensing of the pressure by the first pressure sensor and to provide an output signal that is indicative of the pressure sensed by the first pressure sensor; and a communication link that is coupled to the controller to receive the output signal and to communicate the output signal to a computing device, wherein the computing device includes; a memory configured to store machine executable instructions; and a processor coupled to the memory for executing the machine executable instructions, which causes the processor to carry out two or more functions when the first pressure sensor is connected to the distribution system, including; detecting liquid-related events occurring in the distribution system based upon one or more changes in the pressure indicated by the output signal; and identifying a specific type of the liquid-related events that has been detected from among two or more different types of events, by comparing one or more characteristics of the output signal with one or more determinative criteria associated with the two or more different types of events, wherein; the distribution system comprises one or more valves and one or more fixtures; and when the first pressure sensor is coupled to the distribution system, execution of the machine executable instructions by the processor further causes the processor to; segment the output signal to isolate discrete events, based on the one or more changes in the pressure in the distribution system; classify each of the discrete events that is detected as a valve event comprising either a valve open event or a valve close event, wherein the valve open event corresponds to a valve of the one or more valves opening more, and the valve close event corresponds to a valve of the one or more valves closing more; and classify the valve event according to a specific fixture of the one or more fixtures where the valve event occurred. - View Dependent Claims (38, 39, 40, 41, 42, 43, 44)
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Specification