Vehicle control system
AssigneeDenso Corporation
InventorsNoriaki Okada, Hiromichi Naitoh, Munenori Matsumoto, Mitsugi Ootsuka
Life of this patent
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Abstract
A smart portable device transmits a keyless radio signal for a keyless entry system by two frequency channels. In an integrated tuner, a control IC determines a frequency channel having a better communication state, and controls a frequency of a signal that is input to a mixer from a PLL circuit to a frequency for converting the keyless radio signal of the determined frequency channel into an intermediate frequency signal. This configuration makes it possible to share a circuit for receiving the keyless radio signals of those two frequency channels, and to receive the keyless radio signal of the frequency channel having the better communication state to surely conduct communication.
Claims14
A vehicle control system comprising:
- a portable device that is carried by a user of a vehicle, and transmits a keyless radio signal for a keyless entry system for remotely controlling a device of the vehicle at a plurality of channels that are different in frequency from each other;
- and
- an in-vehicle receiving device that is mounted in the vehicle and receives the keyless radio signal,
- wherein the in-vehicle receiving device includes:
- a receiver antenna for receiving the keyless radio signal;
- channel determining means for determining an optimum channel having a best communication state among the plurality of channels;
- a frequency converter circuit that selects any keyless radio signal of the plurality of channels among the signals that are received by the receiver antenna to convert the selected keyless radio signal into an intermediate frequency signal of a specific frequency;
- a demodulator circuit that demodulates the intermediate frequency signal that is output from the frequency converter circuit;
- and
- control means for allowing the frequency converter circuit to select the keyless radio signal of the optimum channel which is determined by the channel determining means.
A vehicle control system comprising:
- a portable device that is carried by a user of a vehicle, and transmits a keyless radio signal for a keyless entry system for remotely controlling a device of the vehicle at a plurality of channels that are three or more and different in frequency from each other;
- and
- an in-vehicle receiving device that is mounted in the vehicle and receives the keyless radio signal,
- wherein the portable device combines the keyless radio signals of the plurality of channels together, and transmits a combined signal at the same time;
- and
- wherein the in-vehicle receiving device includes;
- a receiver antenna for receiving the keyless radio signal,
- a first frequency converter circuit that selects any keyless radio signal of the plurality of channels among the signals that are received by the receiver antenna to convert a selected keyless radio signal into an intermediate frequency signal of a specific frequency,
- a second frequency converter circuit that converts the keyless radio signal of the channel that is not handled by the first frequency converter circuit into an intermediate frequency signal of a specific frequency,
- a first demodulator circuit that demodulates the intermediate frequency signal which is output from the first frequency converter circuit, and
- a second demodulator circuit that demodulates the intermediate frequency signal which is output from the second frequency converter circuit.
Dependencies are inferred from the claim text.