| 摘要 |
PROBLEM TO BE SOLVED: To provide a tire-air pressure alarm system for a driver free to take a necessary step in the case of determining that the air pressure of a tire is abnormal while driving a vehicle. SOLUTION: An actually measured value is recorded in a memory 24 in a step S104, and the air pressure of the tire measured to be in an abnormal state is measured after a specified period of time passes in a step S105. A decreasing rate of the air pressure is computed in a step S106, and a travellable distance is computed in accordance with the decreasing rate of the air pressure in a step S107. Thereafter, the display of a map and travelling guide derivation to a tire repairing shop existing in the shortest distance in a travellable distant range is carried out on a navigation main body 20 in a step S110. |
