System for checking the air pressure in the tyres of a motor vehicle

• US 20020078741A1
• Filed: 12/03/2001
• Published: 06/27/2002
• Est. Priority Date: 06/02/1999
• Status: Active Grant

• Current Assignee: Pirelli Pneumatici S.P.A. (Pirelli & C SPA)
• Original Assignee: Pirelli Pneumatici S.P.A. (Pirelli & C SPA)
• Inventors: Caretta, Renato, Cantu, Marco
• Granted Patent: US 6,829,926 B2
• Time in Patent Office: Days
• US Class Current: 73/146
• CPC Class Codes: B60C 23/04 mounted on the wheel or tyre
• 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 29/04 Connection to tyres or inner tubes

Abstract

A system for checking at least one status parameter of a tire for a motor vehicle includes at least one wheel, including a tire mounted on a rim, an inner tube inserted into a cavity defined between the tire and the rim, a first device for measuring the at least one status parameter associated with the at least one wheel, a second device for transmitting a signal indicating a value measured by the first device, a third device for receiving the signal, and a fourth device for sensing movement of the at least one wheel and for enabling energization of the second device when the at least one wheel is moving, wherein the first, second, and fourth devices are housed in a container inserted into a wall of the inner tube in a radially-inner position of the inner tube with respect to the at least one wheel.

Claims

1. System for checking at least one status parameter of a tire for a motor vehicle, comprising:

at least one tire wheel comprising a tire mounted on a mounting rim,

a device for measuring said at least one status parameter associated with said wheel;

a transmission device designed to transmit a signal indicating the value measured by said measuring device;

a receiving device designed to receive said signal indicating the value measured by said measuring device,

characterized in that it comprises a sensor for sensing the movement of said wheel, designed to enable energization of said transmission device when said wheel is moving.

2. System according to claim 1, characterized in that said measuring device is associated with an inner tube inserted in said wheel.

3. System according to claim 1, characterized in that said measuring device is inserted in said mounting rim.

4. System according to claim 1, characterized in that said movement sensor is an accelerometric switch.

5. System according to claim 2, characterized in that said transmission device is inserted in a wall of said inner tube in a radially internal position.

6. System according to claim 2, characterized in that said transmission device is inserted in a bush fixed in the wall of said inner tube.

7. System according to claim 1, characterized in that said transmission device, said measuring device and said movement sensor are housed in the same container.

8. System according to claim 1, characterized in that said device for measuring at least one status parameter is a pressure sensor.

9. System according to claim 1, characterized in that said device for measuring at least one status parameter of a tire is a temperature sensor.

10. System according to claim 1, characterized in that said transmission device comprises a power supply battery, a device for measuring the voltage of said battery and transmits the value of the measured voltage by means of a radiofrequency signal.

11. System according to claim 1, characterized in that it further comprises a device for displaying said signal indicating the value measured by said measuring device.

12. System according to claim 2, characterized in that it comprises an inner tube with at least two compartments which are separate from each other and each provided with said measuring device.

14. Wheel according to claim 13, characterized in that said measuring device is associated with an inner tube inserted in said wheel.

15. Wheel according to claim 13, characterized in that said measuring device is inserted in said mounting rim.

16. Wheel according to claim 13, characterized in that said movement sensor is an accelerometric switch.

17. Wheel according to claim 13, characterized in that said device for measuring at least one status parameter of a tire is a pressure sensor.

18. Wheel according to claim 13, characterized in that said device for measuring at least one status parameter of a tire is a temperature sensor.

19. Wheel according to claim 13, characterized in that said transmission device, said measuring device and said movement sensor are housed in the same container.

13. Tire wheel for vehicles, comprising:

a tire mounted on a corresponding mounting rim,

a device for measuring at least one status parameter of said tire associated with said wheel,

a transmission device designed to transmit a signal indicating the value measured by said measuring device,

characterized in that it comprises a sensor for sensing the movement of said wheel, designed to enable energization of said transmission device when said wheel is moving.

20. Sensor for measuring at least one status parameter of a tire wheel for a motor vehicle, said wheel comprising a tire mounted on a mounting rim, comprising:

a device for measuring at least one status parameter of said tire,

a transmission device designed to transmit a signal indicating the value measured by said measuring device,

characterized in that it comprises a sensor for sensing the movement of said wheel, designed to enable energization of said transmission device when said wheel is moving.

21. Sensor according to claim 20, characterized in that it is associated with an inner tube inserted in said wheel.

22. Sensor according to claim 20, characterized in that it is inserted in said mounting rim.

23. Sensor according to claim 20, characterized in that it is inserted from the outside in said mounting rim.

24. Sensor according to claim 20, characterized in that said transmission device, said measuring device and said movement sensor are housed in the same container.