Method and system for determining a tyre load during the running of a motor vehicle
First Claim
1. A method for determining a load exerted on a tyre, fitted on a vehicle, during running of the vehicle on a rolling surface, the method comprising:
- acquiring a first signal comprising a first signal portion representative of a radial deformation;
measuring an amplitude of the radial deformation in the first signal portion;
estimating a rotation speed of the tyre corresponding to the radial deformation;
estimating an inflation pressure of the tyre corresponding to the radial deformation;
providing characteristic functions describing an expected radial-deformation amplitude versus rotation speed that correspond to predetermined conditions of load exerted on the tyre and inflation pressure; and
deriving the load exerted on the tyre from the amplitude, the rotation speed, and the inflation pressure;
wherein the first signal portion is representative of the radial deformation to which a first tread area portion of the tyre is subjected during passage of the first tread area portion through a contact region between the tyre and the rolling surface,wherein measuring the amplitude of the radial deformation comprises measuring a difference between;
a maximum value of the first signal in the first signal portion, anda minimum value of the first signal in the first signal portion, andwherein deriving the load exerted on the tyre comprises;
identifying a set of characteristic functions corresponding to the estimated inflation pressure; and
determining, from the set of characteristic functions, a corresponding set of expected radial-deformation amplitudes corresponding to the estimated rotation speed.
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Abstract
A method for determining a load exerted on a tire, fitted on a vehicle, during running of the vehicle on a rolling surface, is disclosed. The method includes acquiring a first signal comprising a first signal portion representative of a radial deformation; measuring an amplitude of the radial deformation in the first signal portion; estimating a rotation speed of the tire corresponding to the radial deformation; estimating an inflation pressure of the tire corresponding to the radial deformation; and deriving the load exerted on the tire from the amplitude, the rotation speed, and the inflation pressure. The first signal portion is representative of the radial deformation to which a first tread area portion of the tire is subjected during passage of the first tread area portion through a contact region between the tire and the rolling surface. A system for determining the load exerted on the tire is also disclosed.
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Citations
16 Claims
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1. A method for determining a load exerted on a tyre, fitted on a vehicle, during running of the vehicle on a rolling surface, the method comprising:
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acquiring a first signal comprising a first signal portion representative of a radial deformation; measuring an amplitude of the radial deformation in the first signal portion; estimating a rotation speed of the tyre corresponding to the radial deformation; estimating an inflation pressure of the tyre corresponding to the radial deformation; providing characteristic functions describing an expected radial-deformation amplitude versus rotation speed that correspond to predetermined conditions of load exerted on the tyre and inflation pressure; and deriving the load exerted on the tyre from the amplitude, the rotation speed, and the inflation pressure; wherein the first signal portion is representative of the radial deformation to which a first tread area portion of the tyre is subjected during passage of the first tread area portion through a contact region between the tyre and the rolling surface, wherein measuring the amplitude of the radial deformation comprises measuring a difference between; a maximum value of the first signal in the first signal portion, and a minimum value of the first signal in the first signal portion, and wherein deriving the load exerted on the tyre comprises; identifying a set of characteristic functions corresponding to the estimated inflation pressure; and determining, from the set of characteristic functions, a corresponding set of expected radial-deformation amplitudes corresponding to the estimated rotation speed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of controlling a vehicle having at least one tyre fitted on the vehicle, the method comprising:
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determining a load exerted on the at least one tyre; passing the determined load to a vehicle control system of the vehicle; and adjusting at least one parameter in the vehicle control system based on the determined load; wherein the load exerted on the at least one tyre is determined by a method comprising; acquiring a first signal comprising a first signal portion representative of a radial deformation; measuring an amplitude of the radial deformation in the first signal portion; estimating a rotation speed of the at least one tyre corresponding to the radial deformation; estimating an inflation pressure of the at least one tyre corresponding to the radial deformation; providing characteristic functions describing an expected radial-deformation amplitude versus rotation speed that correspond to predetermined conditions of load exerted on the tyre and inflation pressure; and deriving the load exerted on the at least one tyre from the amplitude, the rotation speed, and the inflation pressure; wherein the first signal portion is representative of the radial deformation to which a first tread area portion of the at least one tyre is subjected during passage of the first tread area portion through a contact region between the at least one tyre and a rolling surface, wherein measuring the amplitude of the radial deformation comprises measuring a difference between; a maximum value of the first signal in the first signal portion, and a minimum value of the first signal in the first signal portion, and wherein deriving the load exerted on the tyre comprises; identifying a set of characteristic functions corresponding to the estimated inflation pressure; and determining, from the set of characteristic functions, a corresponding set of expected radial-deformation amplitudes corresponding to the estimated rotation speed. - View Dependent Claims (13, 14, 15, 16)
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Specification