Methods and systems for measuring hose resistance
First Claim
1. A hose degradation monitoring system comprising:
- a hose assembly including a hose having a first conductive layer and a second conductive layer;
a degradation monitoring circuit configured to detect a resistance of the hose across the first and second conductive layers, the degradation monitoring circuit comprising;
a voltage source electrically connected to the first conductive layer;
a resistor electrically connected between the second conductive layer and a ground; and
a voltage monitoring circuit electrically connected to a location between the resistor and the second conductive layer, the voltage monitoring circuit configured to;
periodically monitor a voltage at the location;
determine, in response to the monitored voltage, a resistance attributable to the hose assembly based at least in part on the voltage;
compute an admittance of the hose assembly associated with each periodically determined resistance; and
based at least in part on changes to the computed admittance and a rate of change of the computed admittance, detect a possible failure and type of failure of the hose assembly.
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Accused Products
Abstract
Systems and methods for detecting degradation and failures, include types of failures, in a hose assembly are disclosed. One system includes a hose degradation monitoring circuit having a hose assembly including a hose having first and second conductive layers, and a degradation monitoring circuit configured to detect a resistance of the hose across the conductive layers. The degradation monitoring circuit includes a voltage source electrically connected to the first conductive layer, and a resistor electrically connected between the second conductive layer and ground. The degradation monitoring circuit further includes a voltage monitoring circuit electrically connected between the resistor and the second conductive layer, to periodically monitor a voltage at the location and detect a possible failure of the hose assembly upon determining that, based at least in part on a change in the voltage at the location over time, a resistance of the hose assembly has passed a threshold level.
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Citations
16 Claims
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1. A hose degradation monitoring system comprising:
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a hose assembly including a hose having a first conductive layer and a second conductive layer; a degradation monitoring circuit configured to detect a resistance of the hose across the first and second conductive layers, the degradation monitoring circuit comprising; a voltage source electrically connected to the first conductive layer; a resistor electrically connected between the second conductive layer and a ground; and a voltage monitoring circuit electrically connected to a location between the resistor and the second conductive layer, the voltage monitoring circuit configured to; periodically monitor a voltage at the location; determine, in response to the monitored voltage, a resistance attributable to the hose assembly based at least in part on the voltage; compute an admittance of the hose assembly associated with each periodically determined resistance; and based at least in part on changes to the computed admittance and a rate of change of the computed admittance, detect a possible failure and type of failure of the hose assembly. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of monitoring degradation of a hose assembly having concentric first and second conductive layers separated by an insulating layer, the method comprising:
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(i) applying a voltage to the first conductive layer; (ii) measuring a voltage and a current across a resistor connected between the second conductive layer and a ground, (iii) determining a resistance attributable to the hose assembly based on the voltage and current measured across the resistor; (iv) computing an admittance of the hose assembly based on the resistance attributable to the hose assembly and; (v) based at least in part on a rate of change of computed admittances, determining a type of failure in the hose assembly. - View Dependent Claims (10, 11)
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12. A method of detecting a type of failure of a hose assembly, the method comprising:
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periodically applying a voltage to a first conductive layer of a hose assembly including first and second conductive layers; upon applying the voltage to the first conductive layer, measuring a voltage and a current across a resistor connected between the second conductive layer and a ground; determining a resistance attributable to the hose assembly based at least in part on the voltage as measured between the second conductive layer and a ground; from each resistance, computing an admittance of the hose assembly; and based at least in part on changes to the computed admittance of the hose assembly, determining the existence of a failure in the hose assembly; wherein determining the existence of a failure in the hose assembly includes determining a type of failure of the hose assembly based at least in part on a rate of change of computed admittances. - View Dependent Claims (13, 14, 15, 16)
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Specification