TIRE INFORMATION MONITORING SYSTEM AND TIRE INFORMATION TRANSMITTER

• US 20090033479A1
• Filed: 07/16/2008
• 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:
  US12/174,060
• Publication Number:
  US 20090033479A1
• 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 23/0413 Wireless charging of active radio frequency circuits
• 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: a first antenna; a sensor circuit configured as a resonance circuit; a transceiver circuit that is connected between the first 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 first 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 first antenna; a second antenna; a rectifier circuit for rectifying a high-frequency reception signal output through the second antenna; a memory circuit having stored therein information on the tires and/or the sensor circuit; a control circuit that is supplied with electricity from the rectifier circuit and reads the information on the tires and/or the sensor circuit from the memory circuit; and a modulation circuit that is connected to the first antenna and modulates the carrier wave signal received through the first antenna with the information on the tires and/or the sensor circuit, read by the control circuit.

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:

a first antenna;

a sensor circuit configured as a resonance circuit;

a transceiver circuit that is connected between the first 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 first 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 first antenna;

a second antenna;

a rectifier circuit for rectifying a high-frequency reception signal output through the second antenna;

a memory circuit having stored therein information on the tires and/or the sensor circuit;

a control circuit that is supplied with electricity from the rectifier circuit and reads the information on the tires and/or the sensor circuit from the memory circuit; and

a modulation circuit that is connected to the first antenna and modulates the carrier wave signal received through the first antenna with the information on the tires and/or the sensor circuit, read by the control circuit.

2. The tire information transmitter according to claim 1, wherein the memory circuit stores therein, as the information on the tires and/or the sensor circuit, correction data for correcting the tire information measured by the sensor circuit in accordance with inherent characteristics of the sensor circuit.

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

4. 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:

a first antenna;

a sensor circuit configured as a resonance circuit;

a transceiver circuit that is connected between the first 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 first 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 first antenna;

a second antenna;

a rectifier circuit for rectifying a high-frequency reception signal output through the second antenna;

a memory circuit having stored therein information on the tires and/or the sensor circuit;

a control circuit that is supplied with electricity from the rectifier circuit and reads the information on the tires and/or the sensor circuit from the memory circuit; and

a modulation circuit that is connected to the first antenna and modulates the carrier wave signal received through the first antenna with the information on the tires and/or the sensor circuit, read by the control circuit,

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 information on the tires and/or the sensor circuit in the modulation circuit to thereby acquire the information, 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.