Abstract: Unnecessary consumption of power of an auxiliary primary battery 2, and other problems have been inherent in a conventional battery system. Such problems have occurred because of frequent switching from a main battery to the auxiliary primary battery 2 when power is supplied from the main battery loaded on a vehicle to emergency call devices 6 and 7. According to the present invention, a novel battery switching device is disclosed, capable of executing automatic switching at a voltage for making operable the emergency radio signal generation circuit 6 of an emergency call device, and executing switching based on the starting signal of a manual switch 17 or an air bag at a higher voltage.

Abstract: The depth of discharge of an auxiliary battery 6 is calculated, and the lifetime of the auxiliary battery 6 is determined based on the discharge. characteristic of the calculated one of different depths of discharge.

Abstract: An emergency call system is provided in which an arithmetic and control unit sets a drive mode or a theft prevention mode in a vehicle, in accordance with an instruction provided from a HELP center or a portable phone of an authorized user via a data transmission unit, or provided locally via an operation interface, and in which a determination as to occurrence of a theft is made accurately under the control of the arithmetic and control unit on the basis of a current vehicle location obtained via a GPS reception/gyro sensor unit, verification of an ID of a user, frequency of trials for verification of the ID, status of a door of the vehicle, and time that elapses while the door remains closed.

Abstract: In an emergency call system with the battery switching function, an auxiliary battery is arranged in a vehicle, and an arithmetic calculation control unit always monitors a battery voltage (+B) of a main battery arranged in the vehicle, an ACC voltage supplied during a driving operation of an engine and a voltage of the auxiliary battery.

Abstract: An emergency call system is provided in which an arithmetic and control unit sets a drive mode or a theft prevention mode in a vehicle, in accordance with an instruction provided from a HELP center or a portable phone of an authorized user via a data transmission unit, or provided locally via an operation interface, and in which a determination as to occurrence of a theft is made accurately under the control of the arithmetic and control unit on the basis of a current vehicle location obtained via a GPS reception/gyro sensor unit, verification of an ID of a user, frequency of trials for verification of the ID, status of a door of the vehicle, and time that elapses while the door remains closed.

Abstract: In an emergency call system with the battery switching function, an auxiliary battery is arranged in a vehicle, and an arithmetic calculation control unit always monitors a battery voltage (+B) of a main battery arranged in the vehicle, an ACC voltage supplied during a driving operation of an engine and a voltage of the auxiliary battery. In a first case where the battery voltage (+B) and the ACC voltage are equal to or more than 8 V during the driving operation of the engine in case of no emergency, the arithmetic calculation control unit switches to the battery voltage (+B) and the ACC voltage to make an emergency call system be operated. Also, in a second case where the battery voltage (+B) is equal to or more than 8 V during the operation stopping of the engine in case of no emergency, the arithmetic calculation control unit switches to the only battery voltage (+B) to make the emergency call system be operated.