Patent ID: 6388568
Filing Date: 2002-05-14
Classification: B60C

Abstract:
An apparatus for alarming decrease in tire air-pressure which alarms decrease of internal pressure of a tire on the basis of a rotational information obtained by tires attached to a four-wheeled vehicle mounting a limited slip differential device thereon, comprising:rotational information detecting means for detecting a rotational information of each of the tires; memory means for storing the rotational information of each of the tires; calculation processing means for calculating a reciprocal number of a turning radius from the rotational information of the tire attached to a driving shaft among the rotational information of the respective tires and calculating a judged value from the rotational information of the respective tires; internal pressure judging means for comparing the judged value with a reference value for the judged value at every regions in right turning regions and left turning regions of the turning radius on the basis of a relation between the reciprocal number of the turning radius and the judged valve so as to judge decrease in internal pressure; torque judging means for judging decrease in limited slip differential torque of the limited slip differential device on the basis of respective judged value in the right turning region and the left turning region; and updating means for initializing the reference value for updating the reference value.