System for monitoring the pressure of tires of a motor vehicle
First Claim
1. A system for monitoring the pressure of tires of a motor vehicle with location of the wheels, comprising a monitoring element, one pressure sensor per wheel i associated with a transmitter with which it transmits to the monitoring element a radio signal comprising sensor identification data, the system comprising:
- a means for determining the phase shift (di) between two radio signals transmitted at two distinct times (T1 and T2) for each wheel i;
a means for determining the rotation angle (Dj), modulo 2π
, traveled by each of the wheels j between the two times (T1 and T2);
a means for comparison between the phase shifts (di) and the rotation angles (Dj), including determining first wheel angles based on the phase shifts and second wheel angles based on the rotation angles, and ranking the first wheel angles and second wheel angles in order to create pairs of wheel angles; and
a means for identify the location of the wheels based on the ranking.
1 Assignment
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Accused Products
Abstract
According to one exemplary embodiment, a system for monitoring the pressure of tires of a motor vehicle with location of the wheels comprises a monitoring element and a pressure sensor. Each pressure sensor is associated with a transmitter with which it transmits to the monitoring element a radio signal comprising sensor identification data. The system comprises a means for determining the phase shift between two radio signals transmitted at two distinct times for each wheel. The system further comprises a means for determining the rotation angle, modulo 2π, traveled by each of the wheels between the two times. The system further comprises a means for comparison between the phase shifts and the rotation angles.
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Citations
13 Claims
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1. A system for monitoring the pressure of tires of a motor vehicle with location of the wheels, comprising a monitoring element, one pressure sensor per wheel i associated with a transmitter with which it transmits to the monitoring element a radio signal comprising sensor identification data, the system comprising:
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a means for determining the phase shift (di) between two radio signals transmitted at two distinct times (T1 and T2) for each wheel i;
a means for determining the rotation angle (Dj), modulo 2π
, traveled by each of the wheels j between the two times (T1 and T2);
a means for comparison between the phase shifts (di) and the rotation angles (Dj), including determining first wheel angles based on the phase shifts and second wheel angles based on the rotation angles, and ranking the first wheel angles and second wheel angles in order to create pairs of wheel angles; and
a means for identify the location of the wheels based on the ranking. - View Dependent Claims (2, 3, 4)
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5. A method of identifying the locations of wheels on a vehicle, comprising:
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determining phase shifts between radio frequency signals transmitted at a plurality of times from each wheel;
determining rotation angles traveled by each wheel at the plurality of times;
identifying the locations of the wheels on the vehicle based on the phase shifts and the rotation angles. determining first wheel angles based on the phase shifts and second wheel angles based on the rotation angles;
ranking the first wheel angles and second wheel angles in order to create pairs of wheel angles; and
identifying the location of the wheels based on the ranking. - View Dependent Claims (6, 7, 8)
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9. A method of identifying the locations of wheels on a vehicle, comprising, for each of a plurality of wheels:
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receiving a radio frequency signal having a periodic modulation at first and second times and determining a phase shift in the periodic modulation between the first and second times;
receiving a speed signal from a wheel speed sensor;
identifying the locations of the wheels on the vehicle based on the phase shifts and the speed signals;
ranking the phase shifts and wheel rotation angles in order to create pairs of wheel angles; and
identifying the locations of the wheels based on the ranking. - View Dependent Claims (10, 11, 12, 13)
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Specification