Method and system for determining the potential friction between a tyre for vehicles and a rolling surface
First Claim
1. A method for determining potential friction between a tyre and a rolling surface, a footprint being defined between said tyre and said rolling surface, comprising:
- rotating the tyre on the rolling surface so as to subject a crown portion of the tyre to an acceleration radial component, according to a radial direction of the tyre;
obtaining data representative of the acceleration radial component to which said crown portion is subjected during at least one tyre revolution, said acceleration radial component comprising two regions Rdrop and a region Rin, in which said regions Rdrop represent two regions in which, due to the entry and exit of said crown portion from the footprint, the acceleration radial component respectively undergoes, in absolute value, an abrupt drop from a maximum value to a value about zero and an abrupt increase from a value about zero to a maximum value, and said region Rin represents a region in which, due to the passage of said crown portion within the tyre footprint, the acceleration radial component is about zero;
starting from said data, selecting data representative of at least one transition region of said acceleration radial component, said at least one transition region comprising at least one portion of one of said regions Rdrop, contiguous to said region Rin;
processing the selected data so as to obtain information correlated with the steepness of transition of said at least one transition region; and
estimating the potential friction on the basis of said information correlated with the steepness of transition.
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Abstract
A method and system for determining the potential friction between a tire and a rolling surface wherein: the tire is rotated on the rolling surface so as to subject a crown portion of the tire to an acceleration radial component; data are obtained which are representative of the acceleration radial component to which the crown portion is subjected during at least one tire revolution; starting from the data, data are selected which are representative of at least one transition region of the acceleration radial component; the selected data are processed so as to obtain information correlated with the steepness of transition of the at least one transition region; and the potential friction is estimated on the basis of the information correlated with the steepness of transition.
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Citations
10 Claims
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1. A method for determining potential friction between a tyre and a rolling surface, a footprint being defined between said tyre and said rolling surface, comprising:
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rotating the tyre on the rolling surface so as to subject a crown portion of the tyre to an acceleration radial component, according to a radial direction of the tyre; obtaining data representative of the acceleration radial component to which said crown portion is subjected during at least one tyre revolution, said acceleration radial component comprising two regions Rdrop and a region Rin, in which said regions Rdrop represent two regions in which, due to the entry and exit of said crown portion from the footprint, the acceleration radial component respectively undergoes, in absolute value, an abrupt drop from a maximum value to a value about zero and an abrupt increase from a value about zero to a maximum value, and said region Rin represents a region in which, due to the passage of said crown portion within the tyre footprint, the acceleration radial component is about zero; starting from said data, selecting data representative of at least one transition region of said acceleration radial component, said at least one transition region comprising at least one portion of one of said regions Rdrop, contiguous to said region Rin; processing the selected data so as to obtain information correlated with the steepness of transition of said at least one transition region; and estimating the potential friction on the basis of said information correlated with the steepness of transition. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system for determining potential friction between a tyre and a rolling surface, a footprint being defined between said tyre and said rolling surface, comprising at least one processing unit capable of being adapted to:
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obtain data representative of an acceleration radial component to which a crown portion is subjected during at least one tyre revolution, said acceleration radial component comprising two regions, Rdrop, and a region Rin, in which said regions Rdrop represent two regions in which, due to the entry and exit of said crown portion from the footprint, the acceleration radial component respectively undergoes, in absolute value, an abrupt drop from a maximum value to a value about zero and an abrupt increase from a value about zero to a maximum value, and said region Rin represents a region in which, due to passage of said crown portion within the tyre footprint, the acceleration radial component is about zero; starting from said data, select data representative of at least one transition region of said acceleration radial component, said at least one transition region comprising at least one portion of one of said regions Rdrop, contiguous to said region Rin, and process the selected data so as to obtain information correlated with steepness of transition of said at least one transition region and estimate potential friction on a basis of said information correlated with the steepness of transition. - View Dependent Claims (9, 10)
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Specification