Device for determining initial correction factors for correcting rotational angular velocity measurements of vehicle tires

摘要

A device for operating correction factors for correcting outputs of rotational angular velocity detectors (1) for detecting the rotational angular velocities of four tires mounted on a vehicle. The device judges whether or not the vehicle is linearly traveling. If the vehicle is linearly traveling, an initial correction factor K₁ for eliminating the effect of a difference in effective rolling radius between the right and left front tires and an initial correction factor K₂ for eliminating the effect of a difference in effective rolling radius between the right and left rear tires are calculated on the basis of the outputs of the rotational angular velocity detectors (1). When it is judged that the vehicle is linearly coasting, an initial correction factor K₃ for eliminating the effect of a difference in effective rolling radius between the front tire and the rear tire is calculated.;Alternatively, when it is judged that the vehicle is cornering, an initial correction factor X₃ is calculated, taking account of slip factor R₅, a judged value D for judging a drop in air pressure of the tire, and a lateral acceleration LA of the vehicle.;If K3 is calculated in both alternative ways, means may be provided to determine and select the candidate correction factor having the higher precision.