MULTI-CHANNEL PASSIVE VEHICLE ACTIVATION SYSTEM
First Claim
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1. A passive activation system for use in an automotive vehicle comprising:
- a fob operative to receive a challenge signal and to send an activation signal in response to the challenge signal at one of a plurality of frequencies; and
an activator installed in the automotive vehicle, the activator operative to select one of the plurality of frequencies based on transmission quality, transmit an indication of the selected frequency to the fob, transmit the challenge signal, and receive the activation signal at the selected frequency.
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Abstract
Remote activation of an automotive vehicle is improved by determining a frequency for the activation signal based on sampled ambient noise conditions. The selected frequency may be transmitted to a passive remote control device in a challenge signal. The remote control device responds with an activation signal at the selected frequency.
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Citations
17 Claims
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1. A passive activation system for use in an automotive vehicle comprising:
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a fob operative to receive a challenge signal and to send an activation signal in response to the challenge signal at one of a plurality of frequencies; and an activator installed in the automotive vehicle, the activator operative to select one of the plurality of frequencies based on transmission quality, transmit an indication of the selected frequency to the fob, transmit the challenge signal, and receive the activation signal at the selected frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of remotely activating a function in an automotive vehicle, the method comprising:
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transmitting a first signal from the automotive vehicle indicating one of a plurality of channels based on ambient noise detected in at least one of the plurality of channels; receiving the first signal in a remote device operative to be moved separately from the automotive vehicle; setting a transmitter in the remote device to transmit at the indicated channel based on the received first signal; transmitting from the remote device a second signal using the indicated channel; receiving the second signal at the automotive vehicle; and activating the automotive vehicle function based on the received second signal. - View Dependent Claims (10, 11, 12, 13, 14)
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15. An automotive vehicle comprising:
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a transmitter; a receiver; automotive equipment operated by a control signal; and control logic in communication with the transmitter, the receiver, and the automotive equipment, the control logic operative to (a) sample noise in the environment using the receiver; (b) determine a channel of operation from a plurality of possible channels based on the sampled noise; (c) transmit a channel signal indicating the determined channel using the transmitter; (d) receive an activation signal from the receiver using the determined channel; and (e) generate the control signal based on the received activation signal. - View Dependent Claims (16, 17)
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Specification