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Method and apparatus for estimating road surface state and tire running state, ABS and vehicle control using the same

  • US 7,203,579 B2
  • Filed: 12/20/2002
  • Issued: 04/10/2007
  • Est. Priority Date: 12/21/2001
  • Status: Expired due to Term
First Claim
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1. A method of estimating the condition of a road and the running state of a tire, comprising:

  • detecting a vibration of a tire, a wheel or a suspension of a running car; and

    detecting a vibration level of a vibration spectrum obtained by analyzing the frequency of the detected vibration to estimate the condition of the road at the time of running, and the running state of the tires,wherein the bandwidth of the frequency band for detecting the vibration level is 1 to 100% of that of a detection frequency band, andwherein the vibration level at a frequency band of at least 10 to 10,000 Hz of the vibration spectrum is detected.

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