State of health monitoring and fault diagnosis for integrated vehicle stability system
First Claim
1. A method for determining a state of health of an integrated vehicle stability system, said method comprising:
- providing at least one primary sensor and at least one secondary sensor for sensing the operation of at least one vehicle characteristic;
calculating an estimated output of the at least one primary sensor using at least one estimate model;
generating at least one residual as the difference between a measured output of the primary sensor and the estimated output of the at least one estimate model; and
using the residual to determine if the primary sensor is faulty.
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Abstract
A system and method for providing state of health monitoring and fault diagnostics for a vehicle stability system. The system includes at least one primary sensor and at least one secondary sensor for sensing the operation of at least one vehicle characteristic. The system calculates an estimated output of the primary sensor using at least one estimate model, and generates at least one residual as the difference between a measured output of the primary sensor and the estimated output of the estimate model. The system uses a residual pattern to determine if the primary sensor is faulty. The system compares the measured output of the primary sensor to a measured output of the secondary sensor if the residual is less than a threshold, and determines that the secondary sensor is faulty if the comparison between the measured outputs of the primary and secondary sensors is greater than a predetermined threshold.
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Citations
23 Claims
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1. A method for determining a state of health of an integrated vehicle stability system, said method comprising:
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providing at least one primary sensor and at least one secondary sensor for sensing the operation of at least one vehicle characteristic; calculating an estimated output of the at least one primary sensor using at least one estimate model; generating at least one residual as the difference between a measured output of the primary sensor and the estimated output of the at least one estimate model; and using the residual to determine if the primary sensor is faulty. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for determining a state of health of an integrated vehicle stability system, said method comprising:
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providing a primary yaw rate sensor and a secondary yaw rate sensor for sensing the yaw rate of the vehicle; providing a primary lateral acceleration sensor and a secondary lateral acceleration sensor for sensing the lateral acceleration of the vehicle; calculating a plurality of estimated outputs of the primary yaw rate sensor using a plurality of different yaw rate estimate models; calculating a plurality of estimated outputs of the primary lateral acceleration sensor using a plurality of different lateral acceleration estimate models; generating a plurality of yaw rate residuals as the difference between a measured output of the primary yaw rate sensor and the plurality of estimated outputs from the plurality of yaw rate estimate models; generating a plurality of lateral acceleration residuals as the difference between a measured output of the primary lateral acceleration sensor and the plurality of estimated outputs from the plurality of lateral acceleration estimate models; comparing the yaw rate and the lateral acceleration residuals to a predetermined threshold and giving the residual a first value if the residual is below the threshold and giving the residual a second value if the residual is above the threshold; determining that the primary yaw rate sensor is not faulty if all of the yaw rate residuals have the first value; determining that the primary lateral acceleration sensor is not faulty if all of the lateral acceleration residuals have the first value; comparing the plurality of yaw rate residuals to a predetermined yaw rate residual matrix if one of the yaw rate residuals is the second value; comparing the plurality of lateral acceleration residuals to a predetermined lateral acceleration residual matrix if one of the lateral acceleration residuals is the second value; determining that the primary yaw rate sensor is faulty if the plurality of yaw rate residuals is close to or matches the yaw rate residual matrix; determining that the primary lateral acceleration sensor is faulty if the plurality of lateral acceleration residuals is close to or matches the lateral acceleration residual matrix; comparing the measured output of the primary yaw rate sensor to a measured output of the secondary yaw rate sensor if all of the yaw rate residuals are the first value; comparing the measured output of the primary lateral acceleration sensor to a measured output of the secondary lateral acceleration sensor if all of the lateral acceleration residuals are the first value; determining that the secondary yaw rate sensor is faulty if the difference between the measured outputs of the primary yaw rate sensor and the secondary yaw rate sensor is above a predetermined threshold; and determining that the secondary lateral acceleration sensor is faulty if the difference between the measured outputs of the primary lateral acceleration sensor and the secondary lateral acceleration sensor is above a predetermined threshold. - View Dependent Claims (12, 13)
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14. A system for determining a state of health of an integrated vehicle stability system, said system comprising:
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at least one primary sensor and at least one secondary sensor for sensing the operation of at least one vehicle characteristic; means for calculating an estimated output of the at least one primary sensor using at least one estimate model; means for generating at least one residual as the difference between a measured output of the primary sensor and the estimated output of the at least one estimate model; and means for using the residual to determine if the primary sensor is faulty. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification