Method for transmitting identification signals formulated according to N different protocols, using an electronic casing provided on a wheel of a vehicle
A method for transmitting n identification signals (P 1 -P 4 ) formulated according to n different protocols, using an electronic casing ( 6 ) provided on a wheel ( 2 ) of a vehicle, as part of an angular correlation locating procedure. An electronic casing ( 6 ) is used, which is programmed to carry out, per wheel turn, x transmissions commanded for x angular positions offset from each other by predetermined angular values and, during each sending operation, a fixed angular position of the electronic casing ( 6 ) is determined, to which position is assigned the reference angular position function for determining the x transmission angular positions of the electronic casing, and a burst of n identification signals sent consecutively for transmission successive angular positions of the electronic casing ( 6 ) is transmitted, each of the signals being formulated according to one of the n protocols and including data for identifying the electronic casing and the transmission angular position thereof.
1. A method for transmitting identification signals (P 1 -Pn) formulated according to n different protocols, using an electronic casing ( 5 - 8 ) provided on a wheel ( 1 - 4 ) of a vehicle (V), as part of a procedure for location by correlation between measurements provided by an angular sensor ( 9 ) incorporated in said electronic casing and measurements provided by a speed sensor ( 13 - 16 ) mounted on the vehicle (V) proximate to said wheel, said transmission method comprising:
using an electronic casing ( 5 - 8 ) which is programmed to carry out, per wheel turn, x transmissions commanded for x angular positions offset from each other by predetermined angular values,
and, during each sending operation:
determining a fixed angular position of the electronic casing ( 5 - 8 ), to which position is assigned the reference angular position function for determining the x transmission angular positions of said electronic casing,
and transmitting a burst of n identification signals sent consecutively for transmission successive angular positions of the electronic casing ( 5 - 8 ), each of said signals being formulated according to one of the n protocols and including the code for identifying the electronic casing ( 5 - 8 ) and data for identifying the transmission angular position thereof.
2. The transmission method as claimed in claim 1 , further comprising:
for each protocol, determining the transmission time for an identification signal formulated according to said protocol,
and, before each sending operation, determining the rotational speed of the wheel ( 1 - 4 ), and in order to carry out the actual transmissions of the n identification signals, selecting a series of transmission angular positions, which positions are separated from each other by angular distances suitable such that the entirety of each of the identification signals is sent between two transmission commands.
3. The transmission method as claimed in claim 2 , further comprising determining a rotational speed threshold value of the wheel ( 1 - 4 ), below which an identification signal is transmitted successively for each of the transmission angular positions, and above which a series of transmission angular positions is selected, which series is suitable such that the entirety of each of the identification signals is sent between two transmission commands.
4. The transmission method as claimed in claim 1 , further comprising modifying, between two bursts, the transmission angular position of each of the identification signals (P 1 -Pn) such that each identification signal (Pi) is transmitted successively for a plurality of transmission angular positions.
5. The transmission method as claimed in claim 2 , further comprising modifying, between two bursts, the transmission angular position of each of the identification signals (P 1 -Pn) such that each identification signal (Pi) is transmitted successively for a plurality of transmission angular positions.
6. The transmission method as claimed in claim 3 , further comprising modifying, between two bursts, the transmission angular position of each of the identification signals (P 1 -Pn) such that each identification signal (Pi) is transmitted successively for a plurality of transmission angular positions.