Patent ID: 8428792
Filing Date: 2013-04-23
Classification: B60R

Abstract:
1. An in-vehicle device control system comprising: a portable device; and a vehicle-side unit mounted in a vehicle for performing a checkup operation about the portable device based on mutual communication, in which the portable device returns a response signal in response to a request signal transmitted from the vehicle-side unit, for controlling an in-vehicle device based on a checkup result of the checkup operation, and for switching a communication frequency for the mutual communication if the checkup result indicates an unsuccessful checkup, thereby to perform the checkup operation again, wherein the portable device receives the request signal transmitted from the vehicle-side unit in the mutual communication with the in-vehicle device, the portable device includes a portable device communication section for returning the response signal including an ID code by using a communication frequency designated by the vehicle-side unit, the vehicle-side unit includes a frequency setting section for setting the communication frequency, which is to be designated to the portable device, among a plurality of communication frequencies having respective priority orders, which are set in correspondence to possibility of successful checkup, the vehicle-side unit includes a vehicle-side communication section for performing the mutual communication with the portable device by transmitting to the portable device the request signal including frequency information indicating the communication frequency set by the frequency setting section and receiving the response signal from the portable device, the vehicle-side unit includes a checkup section for performing the checkup operation based on the ID code included in the response signal received from the portable device by the vehicle-side communication section, the frequency setting section sets a communication frequency having a higher priority order as the communication frequency to be designated to the portable device at each checkup timing in performing the checkup operation at a regular interval; and the frequency setting section sets an order of priority based on either one of a frequency which provided a greater number of times of successful checkups and a frequency which provided a less number of times of unsuccessful checkups.