Title:
Tire air pressure detecting device
Document Type and Number:
Japanese Patent JP5905854
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To detect a reduction in the air pressure of a tire without using a dedicated tire.SOLUTION: Tire air pressure detection devices 10 are mounted inside tires 6. Each of the tire air pressure detection devices 10 includes a tire sensor unit 3. The tire air pressure detection device 10 includes a power supply 18, electrodes 19, a measurement circuit 17, and a sensor unit controller 14. The electrodes 19 are joined to the inner peripheral surface of the tire 6 while being apart from each other in the circumferential direction of the tire 6 and insulated. The measurement circuit 17 measures an electrostatic capacitance of the electrodes 19. When the electrostatic capacitance measured by the measurement circuit 17 is larger than a threshold, the sensor unit controller 14 determines that the air pressure of the tire 6 is reduced.
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Inventors:
Yasuhisa Tsujita
Application Number:
JP2013130746A
Publication Date:
April 20, 2016
Filing Date:
June 21, 2013
Export Citation:
Assignee:
Pacific Industry Co., Ltd.
International Classes:
B60C23/04; B60C19/00; G01L17/00
Domestic Patent References:
| JP7081337A | ||||
| JP2000292291A | ||||
| JP2005029144A |
Foreign References:
| US20080202657 |
Attorney, Agent or Firm:
Makoto Onda
Hironobu Onda
Hironobu Onda