Wireless key and door remote control system

Abstract

A wireless key includes a receiver circuit that operates with a built-in battery, and receives a polling radio wave for wireless key search and authentication from a vehicle, and a transmitter circuit that transmits a lock operation radio wave to a door based on the manipulation on a manipulation device. The wireless key is capable of changing over operation mode between a power saving mode that permits the operation of transmitting the lock operation radio wave by the transmitter circuit and stops the operation of receiving the polling radio wave by the receiving circuit, and a full power mode that permits the operation of transmitting the lock operation radio wave by the transmitter circuit and continues the reception by the receiver circuit.

Description

technical field [0001] The present invention relates to a wireless key for remote locking and unlocking of doors and a door remote control system with the wireless key. Background technique [0002] In recent years, a large number of vehicles have been equipped with remote control systems for locking and unlocking the vehicle doors. The vehicle door locking and unlocking remote control system communicates between a vehicle wireless key (electronic wireless key: mobile device) carried by a user (driver) and a vehicle electronic control unit (ECU) to lock or unlock doors. This system is known as a smart key system (for example, JP 2005-264660A). [0003] The smart key system periodically polls a wireless key from an in-vehicle device through wireless communication, so that the wireless key transmits a signal such as an ID code to the in-vehicle device in response to the polling, thereby authenticating a regular user. [0004] In this smart key system, the wireless key needs ...

AI Technical Summary

Problems solved by technology

Since the self-discharge of the dry cell is easily affected by the storage temperature, the battery life of the spare wireless key may have been exhausted depending on the state of storage

As a result, when the battery of the regular wireless key is depleted and cannot be used, the battery of the spare wireless key is also depleted, with the result that it no longer functions as a "backup"

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