METHOD FOR TRANSMITTING SIGNALS FROM ELECTRONIC HOUSINGS MOUNTED ON THE WHEELS OF A VEHICLE TO A CENTRAL UNIT MOUNTED ON SAID VEHICLE

• US 20090190632A1
• Filed: 01/29/2009
• Published: 07/30/2009
• Est. Priority Date: 01/30/2008
• Status: Active Grant

• Current Assignee: Continental Automotive France (Continental AG)
• Original Assignee: Continental Automotive France (Continental AG)
• Inventors: COSTES, Olivier
• Granted Patent: US 7,977,811 B2
• Time in Patent Office: Days
• US Class Current: 375/141
• CPC Class Codes: B60C 23/0408 transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver
• CPC Class Codes: B60C 23/0433 Radio signals
• CPC Class Codes: B60C 23/0464 to avoid signal interference
• CPC Class Codes: H04B 1/69 Spread spectrum techniques
• CPC Class Codes: H04Q 9/00 Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom

Abstract

A method of transmitting signals from electronic housings, each mounted on one wheel of a vehicle, to a central unit (11) on the vehicle, uses spread spectrum. There is allocated, on the one hand, to each electronic housing (6-9) and to the central unit (11), a first common generic orthogonal spread code (Cg) identical for the electronic housings and the central unit and, on the other hand, to each electronic housing, a second orthogonal spread code (Ci) specific to the electronic housing. An initializing procedure causes the transmission by each electronic housing of a spread signal (e) based on the common generic spread code (Cg), incorporating the second specific orthogonal spread code (Ci) and the identification code (ID) of the electronic housing. Subsequent transmissions include transmission by each electronic housing of a spread signal (e) on the basis of the second specific spread code (Ci) of the electronic housing.

Claims

1. A method of transmission from electronic housings (6-9), each one of which is mounted on one of the wheels (2-5) of a vehicle (1), to a central unit (11) mounted on said vehicle, of signals representative of operational parameters of each wheel (2-5) and furthermore comprising an identification code (ID) of the latter, said transmission method consisting in using, for the transmission of each signal, a spread spectrum technique, and being characterized in that it consists

in an preliminary phase, in allocating:

on the one hand, to each electronic housing (6-9) and to the central unit (11), a first common generic orthogonal spread code (Cg) identical for all of said electronic housings (6-9) and the central unit (11),

and, on the other hand, to each electronic housing (6-9), a second orthogonal spread code (Ci) specific to said electronic housing,

in using an initializing procedure consisting in causing the transmission by each electronic housing (6-9) of a spread signal (e) on the basis of the first common generic spread code (Cg), incorporating the second specific orthogonal spread code (Ci) and the identification code (ID) of said electronic housing,

then in using a transmission procedure consisting in causing the transmission by each electronic housing (6-9) of a spread signal (e) on the basis of the second specific spread code (Ci) of said electronic housing.

2. The transmission method as claimed in claim 1, characterized in that the second orthogonal spread code (Ci) specific to each electronic housing (6-9) consists of a random code generated from the identification code (ID) of said electronic housing.

3. The transmission method as claimed in claim 1, characterized in that each spread signal (e) is modulated at radio frequency and then integrated in a carrier wave of predetermined frequency.

4. The transmission method as claimed in claim 2, characterized in that each spread signal (e) is modulated at radio frequency and then integrated in a carrier wave of predetermined frequency.