VEHICLE SYSTEM, IN-VEHICLE APPARATUS, AND PORTABLE DEVICE

摘要

A vehicle system includes: an in-vehicle apparatus having a signal transmission unit that transmits different pulse pattern signals from multiple transmitting antennas; and a portable device having a receiving unit that receives the signals. The in-vehicle apparatus or the portable device includes a portable device position identification unit that identifies a position of the portable device according to the signals. The portable device includes a frequency-to-voltage conversion unit that outputs a voltage corresponding to a frequency of each signal. The portable device position identification unit includes: a first storage unit that preliminary stores voltage change patterns corresponding to the frequencies of the signals in relation to positions of the vehicle; and a first position estimation unit that compares the voltage change patterns of the frequency-to-voltage conversion unit with the voltage change patterns in the first storage unit, and estimates the position of the portable device.

主权项

1. A vehicle system comprising:
an in-vehicle apparatus that is mounted in a vehicle; and a portable device that is carried by a user, wherein: the in-vehicle apparatus includes a pulse pattern signal transmission unit that transmits a plurality of pulse pattern signals at an overlapping timing, with strengths of radio waves changed according to patterns different from each other, from a plurality of transmitting antennas that are arranged at different positions of the vehicle, and have transmission frequencies set to be different from each other; the portable device includes a receiving unit that receives the radio waves transmitted from the plurality of transmitting antennas; at least one of the in-vehicle apparatus and the portable device further includes a portable device position identification unit that identifies a position of the portable device relative to the vehicle according to a received synthetic pattern of the pulse pattern signals received by the receiving unit; the portable device further includes a frequency-to-voltage conversion unit that outputs a plurality of voltages corresponding to frequencies of the pulse pattern signals transmitted from the plurality of transmitting antennas, which are received by the receiving unit at an overlapping timing; the portable device position identification unit includes:
a first storage unit that preliminary stores a plurality of voltage change patterns of voltages corresponding to the frequencies of the pulse pattern signals transmitted from the plurality of transmitting antennas, which are received by the receiving unit at the overlapping timing, in relation to positions of the vehicle; anda first position estimation unit that compares the voltage change patterns of the voltages output from the frequency-to-voltage conversion unit with the voltage change patterns stored in the first storage unit, and estimates the position of the portable device relative to the vehicle; and the portable device position identification unit identifies the position of the portable device relative to the vehicle based on an estimated result in the first position estimation unit.