×

Vehicle-mounted emergency report device

  • US 9,616,835 B2
  • Filed: 03/05/2014
  • Issued: 04/11/2017
  • Est. Priority Date: 03/21/2013
  • Status: Active Grant
First Claim
Patent Images

1. A vehicle-mounted emergency report device mounted in a vehicle that has a function of transmitting an emergency report signal to a center device via a communication network and is configured to operate using electric power supplied from a vehicle battery as operating power, the vehicle-mounted emergency report device comprising:

  • a backup battery supplying the operating power to operate the vehicle-mounted emergency report device when the electric power supplied from the vehicle battery decreases;

    a voltage detection unit detecting a voltage of the backup battery;

    a first determination unit determining whether the voltage detected by the voltage detection unit is lower than a battery exhaustion warning threshold;

    a second determination unit determining whether a second order differential coefficient calculated by differentiating a battery voltage function of the backup battery twice by time is negative; and

    a warning unit;

    refraining from warning of battery exhaustion when the voltage detected is lower than the battery exhaustion warning threshold and the second order differential coefficient is not negative; and

    warning of the battery exhaustion when the voltage detected is lower than the battery exhaustion warning threshold and the second order differential coefficient is negative.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×