Method and apparatus for on-board/off-board fault detection
First Claim
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1. A method for monitoring a subsystem of a subject vehicle, comprising:
- when an on-board algorithm detects unexpected behavior in the subsystem, communicating subsystem data to an off-board environment;
in the off-board environment, executing a controller-based scheme comprising;
determining a plurality of residuals based upon expected and observed states of parameters associated with operation of the subsystem;
determining a subsystem operating signature based upon the residuals;
employing the subsystem operating signature to isolate a subsystem fault by comparing the subsystem operating signature to a subsystem fault isolation matrix determined in an off-line control scheme; and
communicating the subsystem fault from the off-board environment to an on-board controller of the subject vehicle.
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Abstract
A method for monitoring a subsystem of a subject vehicle includes, in an off-board environment, executing a controller-based scheme. The scheme includes determining a plurality of residuals based upon expected and observed states of parameters associated with operation of the subsystem, determining a subsystem operating signature based upon the residuals, employing the subsystem operating signature to isolate a subsystem fault, and communicating the subsystem fault to an on-board controller of the subject vehicle.
12 Citations
16 Claims
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1. A method for monitoring a subsystem of a subject vehicle, comprising:
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when an on-board algorithm detects unexpected behavior in the subsystem, communicating subsystem data to an off-board environment; in the off-board environment, executing a controller-based scheme comprising; determining a plurality of residuals based upon expected and observed states of parameters associated with operation of the subsystem; determining a subsystem operating signature based upon the residuals; employing the subsystem operating signature to isolate a subsystem fault by comparing the subsystem operating signature to a subsystem fault isolation matrix determined in an off-line control scheme; and communicating the subsystem fault from the off-board environment to an on-board controller of the subject vehicle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for monitoring a subsystem of a subject vehicle, comprising:
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in an off-line environment, executing a controller-based scheme including developing a plurality of residual equations associated with the subsystem; observing parameters of the subsystem on-vehicle and when an on-board algorithm detects unexpected behavior in the subsystem, communicating observed states of the parameters to an off-board system; and executing a controller-based scheme in the off-board system, including; employing the residual equations to determine a plurality of residuals based upon expected states and the observed states of the parameters; determining a subsystem operating signature based upon the residuals; employing the subsystem operating signature to isolate a subsystem fault by comparing the subsystem operating signature to a subsystem fault isolation matrix determined in the off-line environment; and communicating the subsystem fault from the off-board system to the subject vehicle. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A method for monitoring a subsystem of a subject vehicle, comprising:
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in an off-line environment, executing a controller-based scheme including developing a plurality of residual equations associated with the subsystem; communicating subsystem parameters to an off-board system when an on-board algorithm detects unexpected behavior in the subsystem; and executing a controller-based scheme in the off-board system, including; determining a plurality of residuals based upon expected states and observed states of the subsystem parameters; determining a subsystem operating signature based upon the residuals; employing the subsystem operating signature to isolate a subsystem fault by comparing the subsystem operating signature to a subsystem fault isolation matrix determined in the off-line environment; and communicating the subsystem fault from the off-board system to the subject vehicle.
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Specification