Method and system or central station for monitoring tyre condition, and for detecting the presence of chains or nails, on a vehicle
First Claim
1. Process for monitoring the condition of the tires of a vehicle (and, by extension, for detecting the presence or absence of snow chains, studs/nails, or other deforming elements), characterized by the fact that said process consists in measuring a signal that is proportional to the speed of rotation of the wheel and in calculating synchronous (or harmonic) information on the speed of the wheel, and then comparing the results to a threshold and triggering an alarm when this threshold is exceeded.
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Accused Products
Abstract
According to the invention the method, and the system or corresponding device, consist in measuring a signal proportional to the speed of rotation of the wheel and in calculating a harmonic signal of the round of wheel (rather equal to the energies of the harmonics of this signal) then in comparing the result with a threshold and in activating an alarm when over-passing this threshold.
In a variant of the device, the basic signal comes from an accelerometer and is measured on the wheel, the elements of suspension or any representative element of the body of the vehicle.
Warning the driver and\or information of the security systems such as ABS™ etc.
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Citations
51 Claims
- 1. Process for monitoring the condition of the tires of a vehicle (and, by extension, for detecting the presence or absence of snow chains, studs/nails, or other deforming elements), characterized by the fact that said process consists in measuring a signal that is proportional to the speed of rotation of the wheel and in calculating synchronous (or harmonic) information on the speed of the wheel, and then comparing the results to a threshold and triggering an alarm when this threshold is exceeded.
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27. A process as specified in claim or 25, wherein, whenever a wheel undergoing testing (such as a front or rear wheel) is compared to a reference wheel (such as a rear or a front wheel, the function will be
C %(t)=[Av(t)− - k×
Ar(t+Δ
t)−
r]/Ar(t+Δ
t)in which Av corresponds to the wheel undergoing testing (such as a front or a rear wheel) Ar corresponds to the reference wheel (such as a rear or a front wheel) e is the difference between the wheel undergoing testing and the reference wheel along the longitudinal axis of the vehicle (=wheelbase in the case of a front wheel compared to a rear wheel) Δ
t=e/Vin which V=speed of advance of the vehicle V being calculated, for example, on the basis of the mean speed of the non-driving wheels or of the mean speed of the set of wheels, wherein the wheel undergoing testing is compared to a reference wheel, these two wheels being “
spatially adjusted”
one relative to the other, that is, being referred for the sake of comparison to a single point situated on the longitudinal axis of the vehicle,and wherein, in the event of comparison to a set of wheels, each of the wheels is spatially adjusted before calculation of the criterion C %.
- k×
- 36. Device for monitoring the condition of the tires of a vehicle (and, by extension, for detecting the presence or absence of snow chains, studs, or other deforming elements), wherein said device includes the means for measuring a signal that is proportional to the speed of rotation of the wheel and thus for calculating synchronous (or harmonic) information on the speed of the wheel, and then comparing the results to a threshold and triggering an alarm when this threshold is exceeded.
Specification