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Vehicle control system

  • US 8,102,241 B2
  • Filed: 08/17/2007
  • Issued: 01/24/2012
  • Est. Priority Date: 09/06/2006
  • Status: Active Grant
First Claim
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1. A vehicle control system comprising:

  • a portable unit carried by a user of a vehicle for transmitting a first radio signal for a keyless entry system for remotely operating equipment of the vehicle;

    a vehicle condition detector mounted in the vehicle for transmitting a second radio signal for a vehicle condition monitoring system; and

    an in-vehicle receiver mounted in the vehicle for receiving the first radio signal and the second radio signal,wherein the portable unit transmits the first radio signal through a plurality of channels different in frequency, andwherein the in-vehicle receiver includes;

    a receiving antenna for receiving the first radio signal and the second radio signal;

    a channel determining unit for determining an optimal channel, which is in a most favorable state of communication, among the plurality of channels;

    a frequency conversion unit selecting either the first radio signal or the second radio signal in any of the plurality of channels from among signals received by the receiving antenna and converting the signal into an intermediate frequency signal of a specific frequency;

    a demodulating unit for demodulating the intermediate frequency signal outputted from the frequency conversion circuit; and

    a controlling unit for causing the frequency conversion unit to select the second radio signal when a demodulated signal of the second radio signal is to be acquired by the controlling unit from the demodulating unit, and causing the frequency conversion unit to select the first radio signal in the optimal channel determined by the channel determining unit when a demodulated signal of the first radio signal is to be acquired by the controlling unit from the demodulating unitwherein;

    the channel determining unit includes an accordance determining unit for determining whether or not the demodulated signal of the first radio signal received by the antenna is in accordance with a coding method with respect to each of the plurality of channels, and determines a channel which is in accordance with predetemined coding method, with respect to the demodulated signal by the accordance determining unit as the optimal channel;

    the in-vehicle receiver includes an optimal channel changing unit for checking an authentication code contained in the demodulated signal of the first radio signal with an authentication code unique to the vehicle, and for changing the optimal channel determined by the channel determining unit when these codes disagree with each other;

    the in-vehicle receiver includes a channel notifying the portable unit of the optimal channel determined by the channel determining unit; and

    the portable unit transmits the first radio signal in the optimal channel notified by the channel notifying unit.

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