Patent ID: 6420966
Filing Date: 2002-07-16
Classification: B60C

Abstract:
An apparatus for alarming decrease in tire air-pressure based on rotational information obtained from tires attached to a four-wheeled vehicle, comprising: a rotational information detecting means for detecting rotational information of each tire; a steering angle detecting means for detecting a steering angle; a memory means for storing the rotational information of each tire and the steering angle; a turning radius calculating and processing means for calculating a turning radius based on the rotational information of each tire; a judged value calculating and processing means for calculating a judged value based on the rotational information of each tire; and a correction means for correcting the turning radius in case it has been determined by the steering angle detecting means that the vehicle is in a straight-ahead driving condition though the driving condition of the vehicle is a turning condition when being based on the turning radius obtained on the basis of the rotational information.