Method of and device for detecting tire pressure drop based on angular velocity

A device for determining a pneumatic pressure drop of a tire provided for a vehicle, comprising:

• rotational angular velocity operating means for determining a rotational angular velocity of a tire;
• judged value operating means for determining a judged value D based on the determined rotational angular velocity;
• correction value operating means for substituting a velocity V of the vehicle, a front/rear acceleration FRA of the vehicle, a lateral acceleration LA of the vehicle and a turning radius of the vehicle into a predetermined polynominal expression to determine a correction value, the predetermined polynominal expression being defined so that an influence of the turning radius R is exerted on all terms;
• judged value correcting means for determining a judged value D' after correction by correcting the judged value D using the correction value;
• and
• reduced pressure judging means for judging whether a tire pressure drops or not, based on the judged value D' after correction.