DETECTING DEVICE FOR TIRE AIR PRESSURE

Japanese Patent JP3136801

B2

PURPOSE: To conduct automatically the classification decision of tires by providing a tire classification deciding means to decide the classification of tires mounted on a vehicle on the basis of resonant frequency.
CONSTITUTION: Resonant frequency is operated at an ECU 4 by extracting the signals of resonant frequency elements out of signals containing the vibration frequency elements of tires 1a, 1b, 1c, 1d, and on the basis of this resonant frequency, the classification decision of tires 1a, 1b, 1c, 1d and the decision of the weight of wheels on which the tires 1a, 1b, 1c, 1d are mounted, are conducted. A tire air pressure drop deciding value is set from both decision results, and the state of tire air pressure is detected by comparing it with the resonant frequency. The resonant frequency changes in accordance with a tire spring constant that is substantially dependent on tire air pressure alone. Also, tire air pressure-resonant frequency characteristic changes according to tire classification, and at the same time changes according to the weight of wheels on which tires are mounted.

Toshiharu Naito
Taguchi Health
Kenji Fujiwara
Tokuda Hiromi

JP29796992A

February 19, 2001

October 08, 1992

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株式会社デンソー

B60C23/02; B60C23/00; G01L17/00; (IPC1-7): B60C23/00; B60C23/02

JP62149503A
JP5133831A
JP5221208A
JP5229320A
JP5254316A
JP5294118A
JP5330322A
JP5213018A
JP6122304A

「自動車技術ハンドブック」＜第１分冊＞基礎・理論編，第１版，社団法人 自動車技術会，１９９０年１２月１日，ｐ．２６４−２８８

Yoji Ito

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