CONTROL SYSTEM

摘要

A control system includes a vehicular device equipped to a vehicle and a portable device carried by a user. The vehicular device transmits, at a first transmission time interval, an RF signal in synchronization with an RF clock signal after a transmission of an LF signal. The portable device counts a reception time interval of the RF signal and determines, based on the reception time interval, a second transmission time interval of a response signal, and transmits the response signal at the second transmission time interval. The vehicular device further determines whether a duration time from transmission of the LF signal or the RF signal to reception of the response signal is within an appropriate range set based on the RF clock signal, and permits a predetermined manipulation to the vehicle when the duration time is within the appropriate range.

主权项

1. A control system comprising:
a vehicular device equipped to a vehicle; and a portable device carried by a user, wherein the vehicular device includes an RF signal transmitting unit transmitting, at a first transmission time interval, an RF signal in synchronization with an RF clock signal after a transmission of an LF signal, the RF clock signal having an RF-band frequency which is higher than a frequency of the LF signal and the first transmission time interval being set based on the RF clock signal, the portable device includes: an RF transceiving unit receiving the RF signal; a transmission time interval determination unit counting a reception time interval of the RF signal received by the RF transceiving unit and determining, based on the reception time interval, a second transmission time interval of a response signal to be transmitted in response to the RF signal that is received; and a response signal transmitting unit controlling the RF transceiving unit to transmit the response signal at the second transmission time interval determined by the transmission time interval determination unit, and the vehicular device further includes: a determination unit determining whether a duration time from a transmission of one of the LF signal or the RF signal to a reception of the response signal is within an appropriate range that is set based on the RF clock signal; and a permission unit permitting a predetermined manipulation to the vehicle when the determination unit determines that the duration time is within the appropriate range.