Patent ID: 8204496

Claim:
An in-vehicle wireless communications device, comprising: a wireless communications unit for transmitting a signal of an emergency report to a wireless communications network; a power supply unit for supplying power to the wireless communications unit from an in-vehicle battery; an electric current integrating unit for computing an electric current integration value by integrating electric currents from the in-vehicle battery when the in-vehicle battery is being discharged, while continuing, even while the emergency report is being transmitted, the computing of the electric current integration value when the in-vehicle battery is being discharged, and generating an interrupt when the electric current integration value reaches a predetermined value; and a control unit for starting an operation of the emergency report to cause the wireless communications unit to transmit the signal when a start trigger of the operation is generated while the wireless communications unit is supplied with the power from the in-vehicle battery, and being enabled to cause the power supply unit to stop supplying the power from the in-vehicle battery when the interrupt is generated, wherein the control unit suspends, while the operation is being executed using the power from the in-vehicle battery, the causing of the power supply unit to stop supplying the power when the interrupt is generated, and then causes, after the operation is normally finished, the power supply unit to stop supplying the power to the wireless communication device.