×

Road surface detecting device

  • US 4,809,197 A
  • Filed: 12/24/1986
  • Issued: 02/28/1989
  • Est. Priority Date: 12/26/1985
  • Status: Expired due to Fees
First Claim
Patent Images

1. A road surface detecting device comprising:

  • means for detecting instantaneous speeds of a wheel at regular intervals;

    means for calculating a presumed speed of a vehicle from said instantaneous speeds;

    means for calculating absolute values of differences between the subsequent instantaneous speeds of said wheel and said presumed speed of said vehicle; and

    means for comparing said absolute values of said differences with a predetermined value and generating a bad road signal indicating that said vehicle is running on a rough road when said absolute values of said differences are not less than said predetermined value.

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