| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a locking/unlocking control device which prevents operation caused by noise reception, to thereby reduce power consumption. <P>SOLUTION: A receiving circuit 23 of the locking/unlocking control device 21 is intermittently activated by a timer circuit 26, and when the receiving circuit in an activated state receives radio waves in the same frequency band as that of a radio signal transmitted from a portable machine 11, it outputs a receiving signal and an activating signal based on the radio waves, to a microcomputer 24. Upon inputting of the activating signal, the microcomputer 24 is switched form a quiescent mode to an activated mode, and counts the number of times of activation. When the counted number reaches a predetermined value, the microcomputer 24 outputs an activation inhibiting signal to the timer circuit 26, whereby the receiving circuit 23 is inhibited from being intermittently activated. Further the microcomputer 24 carries out collation of an ID code, and if the ID code collation is normally processed, the microcomputer carries out locking/unlocking control of a door lock, followed by clearing the counted number to zero. <P>COPYRIGHT: (C)2004,JPO</p> |
