| 摘要 |
PROBLEM TO BE SOLVED: To achieve the notification of a tire air pressure or the warning of a low air pressure state in as an early stage as possible in the case of starting an engine by receiving a signal periodically transmitted from a sensor transmitter in parking for improving convenience for a user while suppressing the increase of dark currents.SOLUTION: When a door unlocking signal is input from a keyless receiver 5, the power supply state of a receiver 3 of a tire air pressure detection device is turned on. Thus, it is possible to detect that there is possibility that a user immediately makes a vehicle travel, and to turn on the power supply state of the receiver 3 only when there is such possibility. Thus, when the possibility that the user makes the vehicle travel is low, it is possible to maintain the power supply OFF state of the receiver 3, and to extremely reduce vehicle dark currents. Then, when there is possibility that the user immediately makes the vehicle travel, it is possible to receive a frame periodically transmitted from a sensor transmitter 2 in parking, and to perform tire air pressure detection. |
