Patent ID: 8228164

Claim:
A remote control system for a car-mounted device, comprising: a portable unit; and an in-car unit for controlling an operation in a car by communication with said portable unit; said portable unit including: a transmission part to transmit a signal intended for a smart function and a signal intended for a keyless function, the keyless function signal being transmitted in response to operating an operating part on the portable unit and the smart function signal being transmitted without operating the operating part; function judgment means for judging whether the keyless function is used based on use of the operating part and whether the smart function is used based on an inquiry signal from said in-car unit; amplification means for controlling transmission power of the transmission part in response to a result of judgment obtained at said function judgment means; and system clock generation means for controlling a transmission band of the transmission part in response to a result of judgment obtained at said function judgment part; said in-car unit including: in-car function judgment means for judging whether the keyless function or the smart function is used based on a response signal from said portable unit; and in-car system clock generation means for controlling a receiving band of an in-car receiving part in response to a result of judgment obtained at said in-car function judgment means.