Tire Slip State Detecting Method And Tire Slip State Detecting Apparatus
First Claim
1. A tire slip state detecting method for detecting a slip state in a contact region of a tire which is rotating on a road surface, the method comprising:
- an acquiring step for acquiring measurement data of acceleration at a tread portion of the rotating tire for a duration corresponding to at least one round of tire rotation, the measurement data including at least measurement data of acceleration in a radial direction of the tire;
a contact region determining step including, extracting time series data of acceleration due to tire deformation from the acquired measurement data in the radial direction, subjecting the time series data of acceleration due to tire deformation to a time integration of second order to obtain displacement data, thereby calculating a deformation in the tread portion of the tire, and determining, from the calculated deformation, a contact region of the tire during rotation;
a slip region specifying step for specifying, from the measurement data of acceleration acquired in the acquiring step, a slip region within the determined contact region.
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Abstract
To detect a slip state in a contact region of a rotating tire on a road surface, first, the first radical direction data and the second width direction data of measurement data of acceleration at a tread portion of the rotating tire for a duration corresponding to one round of tire rotation are acquired. Second, time series data of acceleration due to tire deformation is extracted from the first radical direction data and displacement data is obtained by subjecting the time series data of acceleration due to tire deformation to a time integration of second order, thereby a deformation at the tread portion is calculated and a contact region of the rotating tire is determined from the calculated deformation. Next, from the second width direction data, a slip region within the determined contact region is specified based on vibration level of the second data.
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Citations
17 Claims
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1. A tire slip state detecting method for detecting a slip state in a contact region of a tire which is rotating on a road surface, the method comprising:
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an acquiring step for acquiring measurement data of acceleration at a tread portion of the rotating tire for a duration corresponding to at least one round of tire rotation, the measurement data including at least measurement data of acceleration in a radial direction of the tire;
a contact region determining step including, extracting time series data of acceleration due to tire deformation from the acquired measurement data in the radial direction, subjecting the time series data of acceleration due to tire deformation to a time integration of second order to obtain displacement data, thereby calculating a deformation in the tread portion of the tire, and determining, from the calculated deformation, a contact region of the tire during rotation;
a slip region specifying step for specifying, from the measurement data of acceleration acquired in the acquiring step, a slip region within the determined contact region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A tire slip state detecting apparatus for detecting a slip state in a contact region of a tire which is rotating, the apparatus comprising:
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an acquiring unit for acquiring measurement data of acceleration at a tread portion of the rotating tire for a duration corresponding to at least one round of tire rotation, the measurement data including at least measurement data of acceleration in a radial direction of the tire;
a contact region determining unit for extracting time series data of acceleration due to tire deformation from the acquired measurement data in the radial direction, subjecting the time series data of acceleration due to tire deformation to a time integration of second order to calculate displacement data, thereby calculating a deformation in the tread portion of the tire, and determining, from the calculated deformation, a contact region of the tire during rotation; and
a slip region specifying unit for specifying, from the measurement data of acceleration acquired in the acquiring step, a slip region within the determined contact region.
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Specification