| 摘要 |
<P>PROBLEM TO BE SOLVED: To more accurately detect intervention of an RA repeater than a conventional technology in a technology that uses an increase of a communication delay time due to the intervention of the RA repeater, and in the case that this increase is different from an allowable time range of delay time expected at the usual operation of a smart system, determines that there is an intervention of the RA repeater and prohibits smart drive. <P>SOLUTION: A portable station measures reception power of LF data received from an in-vehicle system, and wirelessly transmits RF data including information about this reception power. The in-vehicle system, if the received RF data is normal (130), measures a delay time from the time when the LF data was wirelessly transmitted (135), determines an allowable range of the delay time based on the information about reception power included in the received RF data (140), performs smart drive (150) based on the above-mentioned delay time being in the determined allowable range (145), and prohibits smart drive based on the measured delay time being out of the determined allowable range. <P>COPYRIGHT: (C)2012,JPO&INPIT |
