| 摘要 |
An apparatus for detecting decrease in internal pressure of a tyre based on rotational information obtainable irom tyres attached to a four-wheeled vehicle equipped with a limited slip differential device (6). The apparatus includes a shift amount calculating means for correcting a turning radius or a reciprocal of the turning radius of driving wheels (W1,W2) 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 (W1,W2) and following wheels (W3,W4). There can be calculated accurate turning radius for the driving wheels which is not affected by the LSD. Consequently, decrease in internal pressure can be properly judged also in a vehicle that is comprised with a LSD. <IMAGE>
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