×

ROAD SURFACE CONDITION ESTIMATING METHOD, ROAD SURFACE CONDITION ESTIMATING TIRE, ROAD SURFACE CONDITION ESTIMATING APPARATUS, AND VEHICLE CONTROL APPARATUS

  • US 20090105921A1
  • Filed: 06/19/2006
  • Published: 04/23/2009
  • Est. Priority Date: 06/17/2005
  • Status: Active Grant
First Claim
Patent Images

1. A road surface condition estimating method comprising:

  • detecting the vibration of a tire of a running vehicle;

    dividing the detected tire vibration into vibration in a pre-trailing domain, the domain existing before a trailing edge position, and vibration in a post-trailing domain, the domain existing after a trailing edge position, and at the same timeextracting signals of tire vibration in the pre-trailing domain or signals of tire vibration in a time range corresponding to the pre-trailing domain;

    obtaining a frequency spectrum by analyzing the frequencies of the extracted signals; and

    thereaftercalculating a vibration level in a predetermined frequency band from the obtained frequency spectrum; and

    estimating a road surface condition based on the calculated vibration level.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×