×

Electronic key apparatus for a vehicle

  • US 20080204192A1
  • Filed: 05/22/2007
  • Published: 08/28/2008
  • Est. Priority Date: 02/26/2007
  • Status: Active Grant
First Claim
Patent Images

1. An electronic key apparatus for vehicle, comprising:

  • an on-vehicle device mounted on a vehicle;

    a plurality of portable devices possessed by a user; and

    a control device mounted on the vehicle, wherein;

    the electronic key apparatus for vehicle activates the control device in a case where the on-vehicle device has verified ID codes for the portable devices through communication between the portable devices;

    the on-vehicle device comprises;

    transmission/reception means for communicating with the portable device;

    a memory for storing a first answering signal, a second answering signal, and a third answering signal containing the ID codes for the portable devices;

    reception strength determining means for outputting a reception determination signal for determining that the first answering signal from the portable devices has been received, based on a reception strength of a reception signal;

    drive means for outputting a control signal to the control device of the vehicle; and

    control means for sequentially transmitting, to the portable devices through the transmission/reception means, a first request signal for determining a registered portable device, a second request signal for identifying a number of the registered portable device, and a third request signal for verifying an ID code for the registered portable device, according to a matching result of comparison between the request signals and the answering signals, sequentially receiving the first answering signal, the second answering signal, and the third answering signal from the portable devices based on the transmission, sequentially comparing the first answering signal, the second answering signal, and the third answering signal sent from the portable devices with the first answering signal, the second answering signal, and the third answering signal stored in the memory every time the first answering signal, the second answering signal, and the third answering signal are received from the portable devices, and controlling the drive means in a case where the ID code for the portable device finally registered is verified based on the comparison result; and

    the control means transmits the second request signal to the portable devices through the transmission/reception means in a case where the reception determination signal is received from the reception strength determining means, even when the first answering signal cannot be normally detected.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×