AIR PRESSURE DETECTION DEVICE FOR TIRE

摘要

A vehicle is provided with an air pressure detection device 60 for tire which comprises a temperature sensor 61 for measuring the temperature of a tire, an air pressure sensor 62 for measuring the air pressure of the tire, a reduced air pressure arithmetic portion 63 for calculating a reduced air pressure Pm from the temperature Tx measured by the temperature sensor 61 and the air pressure Px measured by the air pressure sensor 62 by the formula set forth below, and an alarm signal generating portion 66 for generating an alarm signal when the reduced air pressure Pm calculated by the reduced air pressure arithmetic portion 63 is decreased to or below a first threshold value Pa. Pm = Px - K (Tx - T0) The condition where the tire air pressure is lowered to or below a threshold value determined based on a recommended air pressure can be accurately detected, and an alarm can be issued, without being affected by tire temperature rise or temperature variations.