| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an apparatus for detecting decrease in tire air pressure capable of detecting that air pressure of one tire has decreased to zero completely. <P>SOLUTION: The apparatus includes: an acceleration calculator for calculating, based on rotation speed information obtained from a rotation speed detector, accelerations of the respective tires; an acceleration variation calculator for calculating acceleration variations of the tires; a comparator for comparing the acceleration variations; an estimator for presuming a pressure decrease of a tire; an examination means for identifying, based on the tire rotation speed information, a tire having a rotation speed that is higher than the rotation speeds of the other tires or that is lower than a predetermined criterion; and a determiner for determining, when a tire identified by the estimator is identical with a tire identified by the examination means, a pressure decrease of the tire. The determiner is configured to determine that a tire has a decreased air pressure when the tire identified by the estimator is identical with the slowest tire identified by the examination means and when the slowest tire is positioned at a driven wheel. <P>COPYRIGHT: (C)2012,JPO&INPIT |
