| 摘要 |
A car navigation system is adapted to be installed on a car for estimating a location of the car, detecting occurrence of an accident, storing information for use in analyzing the accident and performing communication with the outside. The system includes a CD-ROM for storing emergency communication data, a location unit for generating car location data, an accident detecting unit and a FIFO memory in which the above-mentioned data are stored, being updated in the course of time lapse. The system may include a voice recorder for recording voice information generated internally of the car and an ID card unit for storing personal information about a driver and accompanying passengers. A change in an acceleration sensor signal generated by an acceleration sensor is compared with a shock-ascribable acceleration change which is empirically determined and previously stored for detecting occurrence of an accident, upon detection of which information stored in the FIFO memory as well as information stored in the voice recorder and the IC card unit are sent out by a communication unit to the outside. These functions are automatically implemented by a program running on a main CPU.
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