Tire pressure monitoring system
First Claim
1. A radio frequency identification system for monitoring tire pressure comprising:
- a reader;
a semi-passive RF tag;
a pneumatic tire; and
, a pressure sensor functionally connected to the tire and in communication with the RF tag;
wherein the pressure sensor is capable of communicating tire pressure readings to the RF tag, which in turn is capable of communicating these readings to the reader by modulating backscatter to correspond to said pressure readings.
4 Assignments
0 Petitions
Accused Products
Abstract
This invention relates to systems and methods for monitoring tire pressure using radio frequency identification (RFID). The RFID systems of the present invention include a reader and a RF tag in communication with a pressure sensor. The reader of the present invention comprises an oscillator, modulator, transmitting antenna, receiving antenna and demodulator. The RF tag comprises an antenna, diode detector, comparator, controller and pressure sensor interface. The RF tag further comprises a battery which powers the electronic components of the tag. In embodiments of the present invention, the oscillator generates a signal that is fed to the modulator for encoding information. The modulated signal is then broadcast via the antenna to the RF tag. An antenna on the RF tag received the signal where the comparator and controller interpret the information sent by the reader, receive a pressure reading from the pressure sensor and transmit an encoded signal back to the reader via modulation of reflected energy. The reader in turn receives this reflected energy and demodulates the signal to retrieve the encoded information including the pressure reading.
68 Citations
13 Claims
-
1. A radio frequency identification system for monitoring tire pressure comprising:
-
a reader;
a semi-passive RF tag;
a pneumatic tire; and
,a pressure sensor functionally connected to the tire and in communication with the RF tag;
wherein the pressure sensor is capable of communicating tire pressure readings to the RF tag, which in turn is capable of communicating these readings to the reader by modulating backscatter to correspond to said pressure readings. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A method for determining pressure within a tire comprising:
-
generating an RF signal with a reader device;
receiving the RF signal in the RF tag;
measuring the pressure in a tire with a pressure sensor;
communicating the pressure measurement to an RF tag;
modulating the antenna on the RF tag to encode the pressure information in a reflected RF signal;
reflecting the modulated signal with the pressure information encoded therein from the RF tag;
receiving the modulated signal from the RF tag within the reader; and
demodulating the signal from the RF tag and decoding the information encoded within the signal. - View Dependent Claims (13)
-
Specification