Claims
- 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.
- 2. The method of claim 1 wherein the step of defining a residual evaluation method for each subsystem comprises the step of defining a residual evaluation method selected from the group consisting of parity space method, observer method, and parameter identification method.
- 3. The method of claim 1 wherein the step of partitioning a vehicle model into a plurality of subsystems comprises the step of partitioning said vehicle model into a core subsystem and an external subsystem.
- 4. The method of claim 3 wherein said core subsystem comprises a vehicle dynamics module, a tire module, a powertrain module, a steering module, a suspension module, and a brake module.
- 5. The method of claim 3 wherein said external subsystem comprises an environmental module, a driver module, a sensor module, a brake controller module, a suspension controller module, and a communication module.
- 6. A system for problem diagnosis in a vehicle comprising: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.
- 7. The system of claim 6 wherein each of said residual evaluation units evaluates fault data in accordance with a residual evaluation method selected from the group consisting of parity space method, observer method, and parameter identification method.
- 8. The system of claim 6 wherein said plurality of residual evaluation units comprises a brake/suspension/steering residual evaluation unit, a tire/vehicle dynamic residual evaluation unit, and a powertrain/driver residual evaluation unit.
- 9. The system of claim 6 wherein each of said plurality of fault detector units comprises a primary residual generator adapted to generate fault data.
- 10. The system of claim 9 wherein said primary residual generator is adapted to generate a primary residual representing the error between a measured and calculated variable.
- 11. The system of claim 6 wherein each of said residual evaluation units comprises a secondary residual generator, a residual evaluator, and a decision unit.
- 12. The system of claim 6 wherein each of said plurality of fault detector units comprises a model associated with a module.
- 13. The system of claim 12 wherein said module is selected from the group of modules consisting of vehicle, tire, powertrain, steering, suspension, brake, environmental, driver, sensor, brake controller, suspension controller, and communication modules.
- 14. A vehicle comprising: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.
- 15. The vehicle of claim 14 wherein each of said fault detector units comprises a model and a primary residual generator adapted to generate a residual in accordance with output from said model.
- 16. The vehicle of claim 14 wherein said first module is associated with a core subsystem.
- 17. The vehicle of claim 14 wherein said second module is associated with an external subsystem.
- 18. The vehicle of claim 14 wherein said first module and said second module are selected from the group of modules consisting of vehicle, tire, powertrain, steering, suspension, brake, environmental, driver, sensor, brake controller, suspension controller, and communication modules.
Parent Case Info
This application claims the benefit of U.S. Provisional Patent Application No. 60/247,849 entitled FAULT DETECTION AND ISOLATION SYSTEM AND METHOD and filed Nov. 9, 2000.
US Referenced Citations (11)
Non-Patent Literature Citations (1)
Entry |
Singer et al., A fault-tolerant sensory diagnostic system for intelligent vehicle application; Intelligent Vehicle '95 Symposium; IEEE: Sep. 1995; pp. 176-182. |
Provisional Applications (1)
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Number |
Date |
Country |
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60/247849 |
Nov 2000 |
US |