Electronic key apparatus for a vehicle

• Main Author: HAMAMURA YUKIHIRO
• Format: Patent
• Language: English
• Published: 22.05.2012
• Subjects: ACCESSORIES THEREFOR; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; FIXED CONSTRUCTIONS; HANDCUFFS; KEYS; LOCKS; PERFORMING OPERATIONS; SAFES; TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION; TRANSPORTING; VEHICLES IN GENERAL; VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISEPROVIDED FOR; WINDOW OR DOOR FITTINGS

Provided is an electronic key apparatus for a vehicle, capable of suppressing power consumption, reducing a verification time, and improving responsiveness of an on-vehicle device. The electronic key apparatus for a vehicle includes an on-vehicle device and a plurality of portable devices. In the electronic key apparatus for a vehicle for activating a control device when ID codes of the portable devices are verified, an on-vehicle device includes a transmission/reception unit, a memory, a reception strength determining unit, a drive unit, and a CPU for sequentially transmitting first to third request signals according to a matching result of verification between the request signal and the answering signal, sequentially receiving first to third answering signals from the portable devices, sequentially comparing each of the received answering signals with the first to third answering signals stored in the memory every time the answering signals are received, and outputting a control signal to the drive unit when an ID code of the finally registered portable device is verified. The CPU transmits the second request signal when a reception determination signal is received even in a case where the first answering signal cannot be normally detected.