Patent ID: 9725072
Date: 2017-08-08
CPC Classifications: B60R,G01S,H04B,H04M,H04W

Claim:
1. A vehicle control system comprising: a mobile device carried by a user of a vehicle and an onboard device mounted on the vehicle, wherein the onboard device performs vehicle control predetermined for the vehicle when wireless communication between the mobile device and the onboard device is performed and the onboard device receives an authentication code unique to the vehicle from the mobile device located within an effective area around a specified vehicular place in the vehicle, wherein the onboard device includes: a vehicle-based transmitter to wirelessly transmit a specified vehicle signal via an antenna provided at the vehicular place when a predetermined vehicle-based trigger is detected; wherein the mobile device includes: a mobile-based receiver to receive the vehicle signal; a strength measurement circuit to measure reception strength of the vehicle signal received by the mobile-based receiver; a memory to settle a target distance between the mobile device and the vehicular place and store strength information indicating characteristics of the reception strength corresponding to the target distance; a mobile-based microcomputer, including a mobile-based CPU, to determine whether or not the mobile device is located within the effective area, based on the reception strength measured by the strength measurement circuit and the strength information stored in the memory; and a mobile-based transmitter to wirelessly transmit a specified determination signal when the mobile-based microcomputer determines that the mobile device is located within the effective area; wherein the mobile device further includes: a state detection portion that includes at least one of an acceleration sensor to detect a mobile state quantity as a tilt amount of the mobile device with reference to a gravity direction and a battery level computation circuit to detect the mobile state quantity as a remaining battery level of the mobile device, the mobile-based microcomputer acquiring correction information indicating characteristics of the reception strength corresponding to the mobile state quantity; and the mobile-based microcomputer corrects the strength information stored in the memory based on wherein: the reception strength of the vehicle signal measured by the strength measurement circuit of the mobile device varies with the mobile state quantity of the mobile device; and the mobile-based microcomputer of the mobile device determines whether or not the mobile device is located within the effective area, based on: