Emergency notification system and method for notifying emergency

A method for notifying emergency from an in-vehicle emergency notification device mounted on a vehicle to a center device mounted in a service center, the method comprising:

• transmitting a preliminary notification signal from the in-vehicle emergency notification device to the center device via a communication network when the in-vehicle emergency notification device determines that a possibility to collide on another vehicle or an obstacle is equal to or higher than a predetermined threshold value;
• transmitting an emergency notification signal from the in-vehicle emergency notification device transmits to the center device via the communication network when the in-vehicle emergency notification device determines that the vehicle collides on another vehicle or an obstacle;
• transmitting a cancel signal from the in-vehicle emergency notification device to the center device via the communication network when the in-vehicle emergency notification device determines that the vehicle avoids collision after the in-vehicle emergency notification device determines that the possibility to collide on the another vehicle or the obstacle is equal to or higher than the predetermined threshold value;
• executing a preliminary notification process in the center device when the center device determines that the center device receives the preliminary notification signal from the in-vehicle emergency notification device, wherein the preliminary notification process includes waiting for receiving the emergency notification signal or the cancel signal by the center device for a first predetermined time;
• executing an emergency notification process in the center device for notifying emergency when the center device determines that the center device receives the emergency notification signal from the in-vehicle emergency notification device;
• terminating the preliminary notification process in the center device when the center device determines that the center device receives the cancel signal from the in-vehicle emergency notification device;
• determining by the center device whether it is necessary to execute the emergency notification process when the center device determines that the first predetermined time has elapsed without receiving the emergency notification signal and the cancel signal after the center device determines that the center device receives the preliminary notification signal from the in-vehicle emergency notification device;
• executing the emergency notification process in the center device when the center device determines that it is necessary to execute the emergency notification process, and
• terminating the preliminary notification process in the center device when the center device determines that it is not necessary to execute the emergency notification process.