Fault detection and isolation system and method
First Claim
1. A method for fault diagnosis in a vehicle comprising the steps of:
- partitioning a vehicle model into a plurality of subsystems, each subsystem comprising one or more modules;
associating a fault detector unit with each module in each subsystem;
defining a residual evaluation method for each subsystem;
evaluating data from said fault detector units in accordance with said residual evaluation method for each subsystem; and
diagnosing a fault in accordance with said evaluated data.
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Abstract
A model-based Fault Detection and Isolation (FDI) method and system for monitoring the overall performance in a vehicle system based on a hierarchical structure is disclosed. The FDI scheme uses the available sensors in a vehicle system and divides them into subsystems of smaller dimensions containing one or more modules that are related or interconnected. The same module may appear in a different subsystem, but the set of all subsystems does not have to contain all of the modules. For this structure, an FDI scheme comprising several detector units is created. Each detector unit receives information from the sensors and outputs a residual that is sent to a high-level detector unit which processes the data and performs the residual evaluation for the selected subsystem. Finally, each subsystem outputs a decision that is sent to a supervisor hazard detector performing the final diagnosis.
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Citations
18 Claims
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1. A method for fault diagnosis in a vehicle comprising the steps of:
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partitioning a vehicle model into a plurality of subsystems, each subsystem comprising one or more modules;
associating a fault detector unit with each module in each subsystem;
defining a residual evaluation method for each subsystem;
evaluating data from said fault detector units in accordance with said residual evaluation method for each subsystem; and
diagnosing a fault in accordance with said evaluated data. - View Dependent Claims (2, 3, 4, 5)
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6. A system for problem diagnosis in a vehicle comprising:
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a plurality of residual evaluation units;
a plurality of fault detector units in communication with said plurality of residual evaluation units, each of said plurality of fault detector units adapted to communicate fault data to at least one of said residual evaluation units; and
a supervisor unit adapted to analyze evaluated data from plurality of residual evaluation units and to diagnose a problem in accordance with said data from said plurality of residual evaluation units. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13)
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14. A vehicle comprising:
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a first plurality of fault detector units associated with a first module in said vehicle adapted to output residuals for said first module;
a second plurality of fault detector units associated with a second module in said vehicle adapted to output residuals for said second module;
a first residual evaluation unit adapted to receive and process in accordance with a first residual evaluation method said residuals from said first plurality of fault detector units;
a second residual evaluation unit adapted to receive and process in accordance with a second residual evaluation method said residuals from said second plurality of fault detector units; and
a supervisor unit adapted to receive output from said first residual evaluation unit and said second residual evaluation unit and to diagnose a fault in accordance with said output from said first residual evaluation unit and said second residual evaluation unit. - View Dependent Claims (15, 16, 17, 18)
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Specification