TIRE INFORMATION MONITORING SYSTEM AND TIRE INFORMATION TRANSMITTER

• US 20090033480A1
• Filed: 07/17/2008
• Published: 02/05/2009
• Est. Priority Date: 08/03/2007
• Status: Abandoned Application

• Current Assignee: ALPS Electric Company Limited (Alps Alpine Co., Ltd.)
• Original Assignee: ALPS Electric Company Limited (Alps Alpine Co., Ltd.)
• Inventors: Tanemura, Takeshi
• Application Number:
  US12/174,891
• Publication Number:
  US 20090033480A1
• Time in Patent Office: Days
• US Class Current: 340/447
• 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

Abstract

A tire information monitoring system composed of a tire information transmitter mounted on tires and a vehicle-side device installed in a vehicle body is provided. The tire information transmitter comprises: an antenna; a sensor circuit configured as a resonance circuit; a transceiver circuit that is connected between the antenna and the sensor circuit, the transceiver circuit extracting an excitation signal for exciting the resonance circuit from a carrier wave signal received through the antenna to input the extracted excitation signal to the sensor circuit, and carrying a resonance signal generated in the sensor circuit in the carrier wave signal to wirelessly transmit the carrier wave signal through the antenna; and a correction data transmission circuit that stores therein correction data for correcting tire information measured by the sensor circuit in accordance with inherent characteristics of the sensor circuit, the correction data transmission circuit modulating the carrier wave signal received through the antenna with the correction data and wirelessly transmitting the modulated carrier wave signal through the antenna.

Claims

1. A tire information transmitter that is mounted on tires and wirelessly transmits tire information to a vehicle-side device, the tire information transmitter comprising:

an antenna;

a sensor circuit configured as a resonance circuit;

a transceiver circuit that is connected between the antenna and the sensor circuit, the transceiver circuit extracting an excitation signal for exciting the resonance circuit from a carrier wave signal received through the antenna to input the extracted excitation signal to the sensor circuit, and carrying a resonance signal generated in the sensor circuit in the carrier wave signal to wirelessly transmit the carrier wave signal through the antenna; and

a correction data transmission circuit that stores therein correction data for correcting tire information measured by the sensor circuit in accordance with inherent characteristics of the sensor circuit, the correction data transmission circuit modulating the carrier wave signal received through the antenna with the correction data and wirelessly transmitting the modulated carrier wave signal through the antenna.

2. The tire information transmitter according to claim 1, wherein the correction data transmission circuit comprises a rectifier circuit that rectifies a high-frequency reception signal output from the antenna through which the carrier wave signal is received to thereby output a direct output voltage.

3. The tire information transmitter according to claim 1, further comprising an antenna selection circuit for selectively connecting the transceiver circuit or the correction data transmission circuit to the antenna.

4. A vehicle-side device that is mounted on tires and that wirelessly communicates with a tire information transmitter having a sensor circuit configured as a resonance circuit to thereby acquire tire information,

wherein the vehicle-side device wirelessly transmits a carrier wave signal that does not contain a frequency signal at which the resonance circuit resonates and receives, from the tire information transmitter, correction data for correcting tire information measured by the sensor circuit in accordance with inherent characteristics of the sensor circuit, and

wherein the vehicle-side device wirelessly transmits a carrier wave signal that contains an excitation signal for exciting the resonance circuit and receives a carrier wave signal carrying a resonance signal of the resonance circuit from the tire information transmitter to thereby calculate a measurement value of the sensor circuit using the resonance signal and the correction data.

5. A tire information monitoring system composed of a tire information transmitter mounted on tires and a vehicle-side device installed in a vehicle body,

wherein the tire information transmitter comprises:

an antenna;

a sensor circuit configured as a resonance circuit;

a transceiver circuit that is connected between the antenna and the sensor circuit, the transceiver circuit extracting an excitation signal for exciting the resonance circuit from a carrier wave signal received through the antenna to input the extracted excitation signal to the sensor circuit, and carrying a resonance signal generated in the sensor circuit in the carrier wave signal to wirelessly transmit the carrier wave signal through the antenna; and

a correction data transmission circuit that stores therein correction data for correcting tire information measured by the sensor circuit in accordance with inherent characteristics of the sensor circuit, the correction data transmission circuit modulating the carrier wave signal received through the antenna with the correction data and wirelessly transmitting the modulated carrier wave signal through the antenna,

wherein the vehicle-side device wirelessly transmits a carrier wave signal that does not contain a frequency signal at which the resonance circuit resonates and receives the carrier wave signal modulated with the correction data in the correction data transmission circuit to thereby acquire the correction data, and

wherein the vehicle-side device wirelessly transmits a carrier wave signal that contains an excitation signal for exciting the resonance circuit and receives a carrier wave signal carrying a resonance signal of the resonance circuit from the tire information transmitter to thereby calculate a measurement value of the sensor circuit using the resonance signal and the correction data.