ELECTRONIC KEY, ADJUSTING METHOD OF TRANSMISSION PARAMETER OF ELECTRONIC KEY, AND ADJUSTING SYSTEM OF TRANSMISSION PARAMETER OF ELECTRONIC KEY

摘要

PROBLEM TO BE SOLVED: To provide an electronic key, an adjusting method of transmission parameters of the electronic key, and an adjusting system of the transmission parameters of the electronic key which can adjust the transmission parameters of the transmission signal easily even after the electronic key is assembled.;SOLUTION: When a portable device 2 receives a request signal from a vehicle as an ID return, it emits an ID signal Sid from an RF circuit 19 and returns it to the vehicle to respond. An EEPROM 17 is housed in the portable device 2. Frequency information Df is written in the EEPROM 17. When the ID signal Sid is sent out, the portable device 2 returns the ID signal Sid to the vehicle at the frequency based on the frequency information Df of the EEPROM 17. In the portable device 2, the frequency of the ID signal Sid can be adjusted by LF communication with a frequency adjusting device 24. When a frequency adjustment command Kb is received from the frequency adjusting device 24, the frequency information Df of the EEPROM 17 is rewritten according to the command.;COPYRIGHT: (C)2007,JPO&INPIT