Method and system for diagnosing mechanical, electromechanical or fluidic components
First Claim
1. A method for diagnosing a component, comprising:
- providing a sensor for structure-borne noise;
providing a device for analyzing a received measurement signal;
measuring the measurement signal via the sensor;
outputting the measurement signal by the sensor in a bandpass filtered manner by virtue of its mechanical resonance frequency, a capacitance of the sensor and an inductance of the sensor;
determining an occurrence with which a level of the measurement signal exceeds a first predefined threshold value; and
generating an error report signal if the ascertained occurrence exceeds a second predefined threshold value,wherein the measurement signal for determining the occurrence is supplied to a digital input of a microcontroller,wherein the microcontroller polls a present value of the measurement signal at the digital input at predefined time intervals, andwherein the time intervals are longer, by a magnitude of at least one, than a maximal period duration of the signal portions of a relevant frequency range in the measurement signal.
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Accused Products
Abstract
There is described a diagnosis method and a system including a structure-born noise sensor which transmits, in a bandpass filtered manner, a measuring signal based on the mechanical resonance frequency and capacity thereof and on an inductance and an evaluating device in which the frequency, at which the measuring signal level exceeds a predetermined threshold value, is defined and which is used for producing an error signal, when the frequency exceeds a second predetermined threshold value. As far as the diagnosis performance requires a small number of electronic components and a low power supply, the diagnostic is integrated into existing devices, in particular into process instrumentation field devices for which a restricted quantity of operating power is available. The method and the system are used for identifying a valve leakage with the aid of an electro-pneumatic positional regulator.
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Citations
9 Claims
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1. A method for diagnosing a component, comprising:
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providing a sensor for structure-borne noise; providing a device for analyzing a received measurement signal; measuring the measurement signal via the sensor; outputting the measurement signal by the sensor in a bandpass filtered manner by virtue of its mechanical resonance frequency, a capacitance of the sensor and an inductance of the sensor; determining an occurrence with which a level of the measurement signal exceeds a first predefined threshold value; and generating an error report signal if the ascertained occurrence exceeds a second predefined threshold value, wherein the measurement signal for determining the occurrence is supplied to a digital input of a microcontroller, wherein the microcontroller polls a present value of the measurement signal at the digital input at predefined time intervals, and wherein the time intervals are longer, by a magnitude of at least one, than a maximal period duration of the signal portions of a relevant frequency range in the measurement signal. - View Dependent Claims (2, 3, 4, 5)
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6. A system for diagnosing components selected from the group consisting of a mechanical component, an electromechanical component, a fluidic component and a combination thereof, comprising:
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a sensor for structure-borne noise, wherein the sensor is comparatively insensitive in the range of low-frequency working noises and sensitive in a higher-frequency range of error noises; a device to analyze a measurement signal from the sensor, wherein the device ascertains a frequency with which the level of the measurement signal exceeds a first predefined threshold value, and wherein the device generates an error report signal if the ascertained frequency exceeds a second predefined threshold value; and a microcontroller, wherein the measurement signal for determining the occurrence is supplied to a digital input of the microcontroller, wherein the microcontroller polls a present value of the measurement signal at the digital input at predefined time intervals, and wherein the time intervals are longer, by a magnitude of at least one, than a maximal period duration of the signal portions of a relevant frequency range in the measurement signal. - View Dependent Claims (7, 8, 9)
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Specification