Apparatus for detecting failures of longitudinal acceleration sensor
First Claim
1. An apparatus for detecting failures of a longitudinal acceleration sensor for detecting a longitudinal acceleration of a motor vehicle, comprising:
- wheel speed calculating means for calculating wheel speeds on the basis of outputs of wheel speed sensors;
estimated vehicle body acceleration calculating means for calculating an estimated vehicle body acceleration on the basis of the wheel speeds;
comparative arithmetic means which calculates a ratio of a vehicle body acceleration calculated from an output of a longitudinal acceleration sensor to the estimated vehicle body acceleration and calculates a first integrating value by performing a subtraction and an addition for the first integrating value when the ratio falls within and out of a predetermined range, respectively; and
fail-safe means for performing a predetermined fail-safe processing if the first integrating value is larger than a predetermined value.
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Abstract
An apparatus for detecting failures of a longitudinal acceleration sensor for detecting a longitudinal acceleration of a motor vehicle, comprising: a wheel speed calculating device for calculating wheel speeds on the basis of outputs of wheel speed sensors; an estimated vehicle body acceleration calculating device for calculating an estimated vehicle body acceleration on the basis of the wheel speeds; a comparative arithmetic device which calculates a ratio of a vehicle body acceleration calculated from an output of the longitudinal acceleration sensor to the estimated vehicle body acceleration and calculates a first integrating value by performing a subtraction and an addition for the first integrating value when the ratio falls within and out of a predetermined range, respectively; and a fail-safe device for performing a predetermined fail-safe processing if the first integrating value is larger than a predetermined value.
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Citations
25 Claims
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1. An apparatus for detecting failures of a longitudinal acceleration sensor for detecting a longitudinal acceleration of a motor vehicle, comprising:
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wheel speed calculating means for calculating wheel speeds on the basis of outputs of wheel speed sensors; estimated vehicle body acceleration calculating means for calculating an estimated vehicle body acceleration on the basis of the wheel speeds; comparative arithmetic means which calculates a ratio of a vehicle body acceleration calculated from an output of a longitudinal acceleration sensor to the estimated vehicle body acceleration and calculates a first integrating value by performing a subtraction and an addition for the first integrating value when the ratio falls within and out of a predetermined range, respectively; and fail-safe means for performing a predetermined fail-safe processing if the first integrating value is larger than a predetermined value. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An apparatus for detecting failures of a longitudinal acceleration sensor for detecting a longitudinal acceleration of a motor vehicle, comprising:
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wheel speed calculating means for calculating wheel speeds on the basis of outputs of wheel speed sensors; estimated vehicle body acceleration calculating means for calculating an estimated vehicle body acceleration on the basis of the wheel speeds; comparative arithmetic means which includes a first means for detecting that the motor vehicle is turning and a second means for detecting that wheels are spinning; wherein when the motor vehicle is not turning and the wheel are not spinning, the comparative arithmetic means calculates a ratio of a vehicle body acceleration calculated from an output of a longitudinal acceleration sensor to the estimated vehicle body acceleration and calculates a first integrating value by performing a subtraction and an addition for the first integrating value when the ratio falls within and out of a predetermined range, respectively; and fail-safe means for performing a predetermined fail-safe processing if the first integrating value is larger than a predetermined value. - View Dependent Claims (8, 9, 10, 11, 12)
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13. An apparatus for detecting failures of a longitudinal acceleration sensor for detecting longitudinal acceleration of a motor vehicle, comprising:
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wheel speed calculating means for calculating wheel speeds on the basis of outputs of wheel speed sensors; estimated vehicle body acceleration calculating means for calculating an estimated vehicle body acceleration on the basis of the wheel speeds; comparative arithmetic means which calculates a first ratio of a vehicle body acceleration calculated from an output of a longitudinal acceleration sensor to the estimated vehicle body acceleration and calculates a plurality of integrating values by performing an addition for said plurality of integrating values when the first ratio falls within and out of a predetermined range, respectively, said plurality of integrating values comprising first and second determined integrating values; and fail-safe means for performing a predetermined fail-safe processing if a second ratio of the second determined integrating value to the first determined integrating value is larger than a predetermined value. - View Dependent Claims (14, 15, 16, 17, 18)
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19. An apparatus for detecting failures of a longitudinal acceleration sensor for detecting a longitudinal acceleration of a motor vehicle, comprising:
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wheel speed calculating means for calculating wheel speeds on the basis of outputs of wheel speed sensors; estimated vehicle body acceleration calculating means for calculating an estimated vehicle body acceleration on the basis of wheel speeds; comparative arithmetic means which includes a first means for detecting that the motor vehicle is turning and a second means for detecting that the wheels are spinning; wherein when the motor vehicle is not turning and the wheels are not spinning, the comparative arithmetic means calculates a first ratio of a vehicle body acceleration, and calculates a plurality of integrating values by performing an addition for the plurality of integrating values when the first ratio falls within and out of a predetermined range respectively, said plurality of integrating values comprising first and second determined integrating values; and fail-safe means for performing a predetermined fail-safe processing if a second ratio of the second determined integrating value to the first determined integrating value is larger than a predetermined value. - View Dependent Claims (20, 21, 22, 23, 24)
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25. An apparatus for detecting failures of a longitudinal acceleration sensor for detecting a longitudinal acceleration of a motor vehicle, comprising;
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estimated vehicle body acceleration calculating means for calculating an estimated vehicle body acceleration; calculation means which calculates a ratio of a vehicle body acceleration calculated from an output of a longitudinal acceleration sensor to the estimated vehicle body acceleration and calculates a first integrating value by performing a subtraction for the first integrating value when the ratio falls within and performing an addition for the first integrating value when the ratio falls out of a predetermined range; and fail-safe means for performing a predetermined fail-safe processing if the first integrating value is larger than a predetermined value.
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Specification