Patent ID: 6529851
Filing Date: 2003-03-04
Classification: B60C

Abstract:
An apparatus for detecting decrease in tire air-pressure for detecting decrease in internal pressure of a tire based on rotational information obtainable from tires attached to a four-wheeled vehicle equipped with a limited slip differential device, wherein the apparatus includes a shift amount calculating means for correcting a turning radius or a reciprocal of the turning radius of driving wheels by using a shift amount which is a difference between turning radiuses or a difference between reciprocals of turning radiuses obtainable from the rotational information of driving wheels and following wheels; a means for calculating acceleration in a lateral direction on the basis of the turning radius or the reciprocal of the turning radius corrected by the shift amount; and a judging means for judging rejection of the rotational information based on the acceleration in the lateral direction calculated by the means for calculating acceleration in the lateral direction and for judging decrease in internal pressure of a tire to give a judgment value wherein the judgment value is corrected with the use of lateral G.