System for monitoring the tires of a vehicle, comprising a device for automatic location of wheel transmitters
First Claim
1. A system for monitoring the tires of a vehicle having two axles, each axle having a tire-wheel assembly and the two tire-wheel assemblies defining an axis D1, said system comprising:
- a wheel unit disposed in each tire-wheel assembly comprising a radio transmitter capable of transmitting waves of a frequency F of more than 300 MHz in short pulses, a central unit for processing data transmitted by the radio transmitter a device for automatically locating the position on the vehicle of the radio transmitters, wherein the automatic locating device comprises;
a first radio reception channel having a first aerial;
a second radio reception channel having a second aerial, the first and second aerials defining an axis that is substantially parallel to D1, said first and second aerials being separated by a distance d, wherein d satisfies the following equation;
(2n+1)λ
/4−
λ
/8≦
d≦
(2n+1)λ
/4+λ
/8, n being an integer greater than or equal to 0, wherein λ
is the wavelength of the frequency F of the radio transmissions of the transmitters;
a first means of comparison of the phases of a radio signal received by the first and second aerials in order to determine whether the radio signal received by the first aerial is ahead of phase, behind phase or has an identical phase relative to the radio signal received by the second aerial; and
a means of processing the results transmitted by the first means of comparison to indicate the position of the radio transmitter relative to the said aerials.
2 Assignments
0 Petitions
Accused Products
Abstract
System for monitoring the tires of a vehicle, comprising a device for automatic location of a radio transmitter, comprising a first radio reception channel having a first aerial and a second radio reception channel having a second aerial, the first and second aerials defining an axis D1, a first means of comparison of the phases of a radio signal received by the first and second aerials in order to determine whether the radio signal received by the first aerial is ahead of phase, behind phase or has an identical phase relative to the radio signal received by the second aerial and a means of processing the results originating from the first means of comparison intended to indicate the position of the radio transmitter relative to the said aerials.
16 Citations
18 Claims
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1. A system for monitoring the tires of a vehicle having two axles, each axle having a tire-wheel assembly and the two tire-wheel assemblies defining an axis D1, said system comprising:
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a wheel unit disposed in each tire-wheel assembly comprising a radio transmitter capable of transmitting waves of a frequency F of more than 300 MHz in short pulses, a central unit for processing data transmitted by the radio transmitter a device for automatically locating the position on the vehicle of the radio transmitters, wherein the automatic locating device comprises;
a first radio reception channel having a first aerial;
a second radio reception channel having a second aerial, the first and second aerials defining an axis that is substantially parallel to D1, said first and second aerials being separated by a distance d, wherein d satisfies the following equation;
(2n+1)λ
/4−
λ
/8≦
d≦
(2n+1)λ
/4+λ
/8,n being an integer greater than or equal to 0, wherein λ
is the wavelength of the frequency F of the radio transmissions of the transmitters;
a first means of comparison of the phases of a radio signal received by the first and second aerials in order to determine whether the radio signal received by the first aerial is ahead of phase, behind phase or has an identical phase relative to the radio signal received by the second aerial; and
a means of processing the results transmitted by the first means of comparison to indicate the position of the radio transmitter relative to the said aerials. - View Dependent Claims (2, 6, 7, 12, 13, 14, 15, 16, 17, 18)
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3. A system for monitoring the tires of a vehicle having two axles, each axle having two tire-wheel assemblies, and the four tire-wheel assemblies defining two diagonal axes D1 and D2, said system comprising:
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a wheel unit disposed in each tire-wheel assembly comprising a radio transmitter capable of transmitting waves of a frequency F of more than 300 MHz in short pulses, a central unit for processing the data transmitted by the radio transmitters, and a device for automatically locating the position on the vehicle of the radio transmitters wherein the automatic locating device comprises;
a first radio reception channel having a first aerial;
a second radio reception channel having a second aerial, the first and second aerials defining an axis that is intended to be substantially parallel to D1, said first and second aerials being separated by a distance d, wherein d satisfies the following equation;
(2n+1)λ
/4 −
λ
/8≦
d≦
(2n+1)λ
/4+λ
/8,n being an integer greater than or equal to 0;
wherein λ
is the wavelength of the frequency F of the radio transmissions of the transmitters;
a first means of comparison of the phases of a radio signal received by the first and second aerials in order to determine whether the radio signal received by the first aerial is ahead of phase, behind phase or has an identical phase relative to the radio signal received by the second aerial;
a third radio reception channel having a third aerial;
a fourth radio reception channel having a fourth aerial, the third and fourth aerials defining an axis intended to be disposed substantially parallel to D2, said third and fourth aerial being separated by a distance d′
such that, λ
being the wavelength of the frequency F of the radio transmissions of the transmitters, d′
satisfies the following equation;
(2n+1)λ
/4−
λ
/8≦
d′
≦
(2n+1)λ
/4+λ
/8,n being an integer greater than or equal to 0;
a second means of comparing the phases of a radio signal received by the third and fourth aerials in order to determine whether the radio signal received by the third aerial is ahead of phase, behind phase or has an identical phase relative to the radio signal received by the fourth aerial;
a means of processing the results originating from the first and second means of comparison intended to indicate the position of the radio transmitter of the signal relative to the said aerials. - View Dependent Claims (4, 5, 8, 9, 10, 11)
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Specification