| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce the number of cases for complaint as trouble of smart key systems brought into car sales stores or service stores from owners of vehicles when the vehicles enter an interception wave area affected by radio waves of long wavelength band, by applying reception function of trigger signal of the long wavelength band in a tire-pressure monitoring system. <P>SOLUTION: On a transmitter-receiver 6 side, a control part 61 detects electric field strength of the long wavelength band received through an LF receiving part 66 and transmits the electric field strength data showing detection value of the electric field strength to a receiver 5. On the other hand, on the receiver 5 side, when a control part 51 judges that the vehicle 100 can exist in the interception wave area of radio wave of the long wavelength band, based on the detection value of electric field strength shown by the electric field strength data received from the transmitter-receiver 6, the control part 51 displays "vehicle existing information" showing that a vehicle 100 may exist in the interception wave area on a display device 3, and outputs it with voice from a voice outputting device 4. <P>COPYRIGHT: (C)2009,JPO&INPIT |
