Method and system for diagnosing a technical installation
First Claim
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1. A diagnostic method for a technical installation for determining a cause of a fault event described by a fault state variable, the method which comprises:
- establishing an operating state of the installation defined by state variables, by determining diagnostic parameters each characterizing one of the state variables;
compiling a dependency tree containing at least some of the diagnostic parameters by configuring the dependency tree with the following hierarchical levels numbered Hn, where n=1, 2, . . . ;
a first hierarchical level containing a fault diagnostic parameter characterizing a fault state variable, a second hierarchical level, following the first hierarchical level, and containing diagnostic parameters defining state variables acting directly on the fault state variable, a hierarchical level Hn+1, following a given hierarchical level Hn, and containing diagnostic parameters defining state variables acting directly on the state variables characterized by the diagnostic parameters at the given hierarchical level Hn;
determining a fault path in the dependency tree starting from the fault diagnostic parameter, by identifying a responsible diagnostic parameter at the hierarchical level Hn+1 depending on one of a magnitude or a change direction of a diagnostic parameter at the given hierarchical level Hn;
inferring a cause of the fault from the responsible diagnostic parameter identified in the identifying step at a last one of the hierarchical levels; and
allocating one of a rising, a falling or a constant change direction to each diagnostic parameter at the hierarchical level Hn+1, for each diagnostic parameter at the given hierarchical level Hn, as a function of a redefined change direction of the respective diagnostic parameter at the given hierarchical level Hn, and establishing the fault path by agreement between measured change directions of the diagnostic parameters and the allocated change directions.
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Abstract
A diagnostic method and system for a technical installation establish the cause of a fault event. A reliable, flexible and simple possible way of diagnosing an installation is provided by placing state variables that characterize an operating state of the technical installation in a dependency tree and establishing a fault path in the dependency tree by linking change directions of diagnostic parameters contained in the dependency tree.
20 Citations
9 Claims
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1. A diagnostic method for a technical installation for determining a cause of a fault event described by a fault state variable, the method which comprises:
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establishing an operating state of the installation defined by state variables, by determining diagnostic parameters each characterizing one of the state variables;
compiling a dependency tree containing at least some of the diagnostic parameters by configuring the dependency tree with the following hierarchical levels numbered Hn, where n=1, 2, . . . ;
a first hierarchical level containing a fault diagnostic parameter characterizing a fault state variable, a second hierarchical level, following the first hierarchical level, and containing diagnostic parameters defining state variables acting directly on the fault state variable, a hierarchical level Hn+1, following a given hierarchical level Hn, and containing diagnostic parameters defining state variables acting directly on the state variables characterized by the diagnostic parameters at the given hierarchical level Hn;
determining a fault path in the dependency tree starting from the fault diagnostic parameter, by identifying a responsible diagnostic parameter at the hierarchical level Hn+1 depending on one of a magnitude or a change direction of a diagnostic parameter at the given hierarchical level Hn;
inferring a cause of the fault from the responsible diagnostic parameter identified in the identifying step at a last one of the hierarchical levels; and
allocating one of a rising, a falling or a constant change direction to each diagnostic parameter at the hierarchical level Hn+1, for each diagnostic parameter at the given hierarchical level Hn, as a function of a redefined change direction of the respective diagnostic parameter at the given hierarchical level Hn, and establishing the fault path by agreement between measured change directions of the diagnostic parameters and the allocated change directions. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A diagnostic system for a technical installation for determining a cause of a fault event described by a fault state variable, the diagnostic system configured to:
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establish an operating state of the installation defined by state variables, by determining diagnostic parameters each characterizing one of the state variables;
compile a dependency tree containing at least some of the diagnostic parameters by configuring the dependency tree with the following hierarchical levels numbered Hn, where n=1, 2, . . . ;
a first hierarchical level containing a fault diagnostic parameter characterizing a fault state variable, a second hierarchical level, following the first hierarchical level, and containing diagnostic parameters defining state variables acting directly on the fault state variable, a hierarchical level Hn+1, following a given hierarchical level Hn, and containing diagnostic parameters defining state variables acting directly on the state variables characterized by the diagnostic parameters at the given hierarchical level Hn;
establish a fault path in the dependency tree starting from the fault diagnostic parameter, by identifying a responsible diagnostic parameter at the hierarchical level Hn+1 depending on one of a magnitude or a change direction of a diagnostic parameter at the given hierarchical level Hn;
determine a cause of the fault from the responsible diagnostic parameter identified in the identifying step at a last one of the hierarchical levels; and
allocate one of a rising, a falling or a constant change direction to each diagnostic parameter at the hierarchical level Hn1, for each diagnostic parameter at the given hierarchical level Hn, as a function of a predefined change direction of the respective diagnostic parameter at the given hierarchical level Hn, and establish the fault path by agreement between measured change directions of the diagnostic parameters and the allocated change directions.
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9. A diagnostic system for a technical installation for determining a cause of a fault event described by a fault state variable, the diagnostic system comprising:
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means for establishing an operating state of the installation defined by state variables, by determining diagnostic parameters each characterizing one of the state variables;
means for compiling a dependency tree containing at least some of the diagnostic parameters by configuring the dependency tree with the following hierarchical levels numbered Hn, where n=1, 2, . . . ;
a first hierarchical level containing a fault diagnostic parameter characterizing a fault state variable, a second hierarchical level, following the first hierarchical level, and containing diagnostic parameters defining state variables acting directly on the fault state variable, a hierarchical level Hn+1, following a given hierarchical level Hn, and containing diagnostic parameters defining state variables acting directly on the state variables characterized by the diagnostic parameters at the given hierarchical level Hn;
means for establishing a fault path in the dependency tree starting from the fault diagnostic parameter, by identifying a responsible diagnostic parameter at the hierarchical level Hn+1 depending on one of a magnitude or a change direction of a diagnostic parameter at the given hierarchical level Hn;
means for determining a cause of the fault from the responsible diagnostic parameter identified in the identifying step at a last one of the hierarchical levels; and
means for allocating one of a rising, a falling or a constant change direction to each diagnostic parameter at the hierarchical level Hn+1, for each diagnostic parameter at the given hierarchical level Hn, as a function of a predefined change direction of the respective diagnostic parameter at the given hierarchical level Hn, and establishing the fault path by agreement between measured change directions of the diagnostic parameters and the allocated change directions.
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Specification