Device and Method for Distinguishing Positions of Tire Sensors of a Double Tire System

• US 20090085734A1
• Filed: 09/29/2008
• Published: 04/02/2009
• Est. Priority Date: 09/28/2007
• Status: Active Grant

• Current Assignee: Continental Automotive GmbH (Continental AG)
• Original Assignee: Continental Automotive GmbH (Continental AG)
• Inventors: Osterreicher, Johannes, Pohl, Alfred, Tschofen, Robert, Gila, Janos
• Granted Patent: US 8,149,100 B2
• Time in Patent Office: Days
• US Class Current: 340/447
• CPC Class Codes: B60C 23/007 having multiple wheels arranged side by side
• CPC Class Codes: B60C 23/008 having wheels on more than two axles
• CPC Class Codes: B60C 23/009 having wheels on a trailer
• CPC Class Codes: B60C 23/0416 allocating a corresponding wheel position on vehicle, e.g. front/left or rear/right
• CPC Class Codes: B60C 23/045 Means for detecting electromagnetic field changes being not part of the signal transmission per se, e.g. strength, direction, propagation or masking

Abstract

A device and a method for distinguishing positions of two tire sensors of a double tire include an LF antenna attached to a vehicle and connected to a central processing unit and one tire sensor each per tire. The tire sensors have a device for measuring field strength of a signal emitted by the LF antenna and the tire sensors report back information on the measured field strength through the LF antenna to the central processing unit. The central processing unit determines the position of the two tire sensors of the double tire from a distribution or course of a current flow during wheel rotation.

Claims

1. A device for distinguishing positions of tire sensors of a double tire on a vehicle, the device comprising:

two tire sensors each associated with a respective tire of the double tire;

a central processing unit disposed on the vehicle;

an LF antenna disposed on the vehicle and connected to said central processing unit;

said tire sensors having a device for measuring field strength of a signal emitted by said LF antenna, and said tire sensors reporting back information about the measured field strength through said LF antenna to said central processing unit; and

said central processing unit determining the position of said two tire sensors of the double tire from a course of a measured current flow during wheel rotation.

2. The device according to claim 1, wherein said tire sensors have a microprocessor unit for processing the measured field strengths.

3. The device according to claim 1, wherein said tire sensors measure an amplitude swing of the field strength.

4. The device according to claim 3, wherein said tire sensor measuring a higher amplitude swing is regarded by said central processing unit as said tire sensor being closer to said LF antenna.

5. The device according to claim 1, wherein the tires define a direction of rotation and a direction of a tire axle, and said tire sensors have a receiving coil mounted at an angle relative to both the direction of rotation and the direction of the tire axle.

6. The device according to claim 1, which further comprises another antenna, said tire sensors determining a direction of current flow of the signal from said LF antenna received by said tire sensors and reporting through said other antenna to said central processing unit, and said central processing unit distinguishing said two tire sensors of the double tire from each other from the direction of current flow.

7. The device according to claim 6, wherein said other antenna is an intelligent receiver antenna.

8. The device according to claim 1, wherein said LF antenna is disposed next to the double tire.

9. The device according to claim 1, wherein said LF antenna is in a horizontal position.

10. The device according to claim 8, wherein said LF antenna is in a vertical position.

11. The device according to claim 1, wherein said LF antenna is attached above a contact surface of one of two tires of the double tire.

12. The device according to claim 1, wherein said tire sensor substantially only receiving Y components of the signal emitted from said LF antenna is identified as said tire sensor rotating beneath said LF antenna.

13. A method for distinguishing positions of two tire sensors of a double tire, the method comprising the following steps:

providing a device according to claim 1;

measuring the field strength of the signal emitted by said LF antenna;

evaluating both field strengths received from said two tire sensors; and

assigning said tire sensors to a particular position at the double tire depending on the measured field strength and the position of said LF antenna relative to a respective tire sensor.

14. The method according to claim 13, which further comprises evaluating an amplitude swing of the field strength, and assigning a higher amplitude swing to said tire sensor closer to said LF antenna.

15. The method according to claim 13, which further comprises placing a receiving coil of said tire sensor at an angle relative to both a direction of rotation of the tire and a direction of a tire axle, and determining a direction of current flow of the signal received from said tire sensor by said LF antenna.

18. The method according to claim 1, which further comprises receiving and evaluating the signal transmitted by the tire sensor with an intelligent receiver unit.

16. A method for distinguishing positions of two tire sensors of a double tire on a vehicle, the method comprising the following steps:

providing a device having an evaluation unit disposed on the vehicle, at least one LF antenna disposed on the vehicle laterally next to the double tire and connected to the evaluation unit for emitting signals with variable power, and tire sensors each associated with a respective tire;

selecting a transmission power, for transmission of a signal through the LF antenna, high enough to enable reception by the two tire sensors of the double tire;

transmitting a signal through the LF antenna to the tire sensors;

checking if both tire sensors have received the signal transmitted by the LF antenna;

if both tire sensors have received the transmitted signal, gradually reducing the LF transmission power for transmission of the signal through the LF antenna and repeating the transmitting and checking steps until only one tire sensor receives the transmitted signal; and

if only one tire sensor has received the transmitted signal, assigning the receiving tire sensor to a position nearest the LF antenna and assigning the other tire sensor having no longer received the transmitted signal to a position furthest from the LF antenna.

17. The method according to claim 16, which further comprises performing a change of status of one tire sensor receiving a signal transmitted by the LF antenna and thus causing a transmission of a signal to evaluate the transmission of a signal from the tire sensor after a prior transmission of a signal by the LF antenna as confirmation of receipt of the LF signal by the tire sensor.