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Measuring method and measuring apparatus to detect charge potential between tire and road surface

  • US 9,772,361 B2
  • Filed: 12/26/2012
  • Issued: 09/26/2017
  • Est. Priority Date: 12/26/2011
  • Status: Active Grant
First Claim
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1. A measuring method, comprising:

  • disposing a first electrode on a vehicle body and a second electrode spaced apart from the first electrode;

    detecting a charge potential between the first electrode and the second electrode, the charge potential distributed over the vehicle body or a tire resulting from contact, separation, and friction between a tire and a road surface;

    monitoring an amplitude of the charge potential detected in the detecting;

    counting plural times a number of specific peaks in each unit period, which is a number of peaks of variation in charge potential occurring in a time-varying waveform of the amplitude larger than a mean of the amplitude in each unit period; and

    determining a state of the road surface under the tire or detecting at least one condition of the tire including an internal pressure state, a wear state, or vibration characteristics of the tire from a frequency of occurrences of the specific peaks.

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