×

Underinflation detector

  • US 6,865,456 B2
  • Filed: 10/17/2003
  • Issued: 03/08/2005
  • Est. Priority Date: 10/29/2002
  • Status: Expired due to Fees
First Claim
Patent Images

1. An underinflation detector for a four-wheeled vehicle comprising:

  • a rotational speed sensor to detect rotational speeds of two front wheels and two rear wheels of the vehicle; and

    a controller to determine that inflation pressure of a tire of any of the wheels has decreased, if a parameter calculated from outputs of the rotational speed sensor exceeds a threshold, wherein a first value of the parameter is calculated using a disparity between a front-wheel rotational speed difference and a rear-wheel rotational speed difference; and

    wherein correction is made to the first value of the parameter to obtain a second value of the parameter to be compared with the threshold by canceling a deviation of one of the front-wheel rotational speed difference and the rear-wheel rotational speed difference caused by a steering operation which a driver performs so as to cancel the other of the front-wheel rotational speed difference and the rear-wheel rotational speed difference arising due to underinflation of the tire.

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