RECORDING DEVICE AND RECORDING METHOD

• US 20090024274A1
• Filed: 09/25/2008
• Published: 01/22/2009
• Est. Priority Date: 03/29/2006
• Status: Abandoned Application

• Current Assignee: Fujitsu Microelectronics Limited (Fujitsu Limited)
• Original Assignee: Fujitsu Microelectronics America Incorporated (Fujitsu Limited)
• Inventors: NAGAI, Kouichi
• Application Number:
  US12/238,000
• Publication Number:
  US 20090024274A1
• Time in Patent Office: Days
• US Class Current: 701/35
• CPC Class Codes: G01D 9/005 Solid-state data loggers
• CPC Class Codes: G07C 5/085 using electronic data carriers

Abstract

There is provided a recording device capable of collecting information which makes it possible to investigate an accident. A recording section, such as a FeRAM, records vehicle information indicative of current conditions of the vehicle at predetermined recording intervals. An accident level-determining section determines whether or not an accident has occurred, based on a magnitude of an impact on the vehicle detected by an impact-detecting section. When it is determined that an accident has occurred, a recording control section causes the recording section to record the vehicle information at the recording intervals (e.g. 0.1 seconds) shorter than those (e.g. 1 second) before the accident. This makes it possible to use pre-accident information and post-accident information to thereby investigate an accident in more detail.

Claims

1. A recording device installed in a vehicle, comprising:

a recording section that records vehicle information indicative of current conditions of the vehicle at predetermined recording intervals;

an accident level-determining section that determines whether or not an accident has occurred, based on a magnitude of an impact on the vehicle detected by an impact-detecting section; and

a recording control section that is operable when it is determined that an accident has occurred, to cause said recording section to record the vehicle information at the recording intervals shorter than those before the accident.

2. The recording device according to claim 1, wherein when it is determined, upon detection of an impact, that no accident has occurred, said recording control section causes said recording section to record the vehicle information at the same recording intervals as those before detection of the impact, and when a remaining recording capacity of said recording section is used up, said recording control section causes said recording section to record new vehicle information by sequentially overwriting old items of the vehicle information in chronological order, oldest first.

3. The recording device according to claim 1, wherein when it is determined that an accident has occurred, said recording control section inhibits overwriting of part of the vehicle information recorded over a fixed time period before the accident.

4. The recording device according to claim 1, wherein said recording control section sets the recording interval before the accident to 1 second and the recording interval after the accident to 0.1 seconds.

5. The recording device according to claim 1, wherein when it is determined, upon detection of an impact, that an accident has occurred, said recording control section sets the recording interval after the accident according to a speed of the vehicle at the time when the impact is detected.

6. The recording device according to claim 5, wherein said recording control section sets the recording interval based on the speed such that the vehicle information is recorded each time the vehicle travels a distance of 2 m to 3 m.

7. The recording device according to claim 1, wherein said recording control section sets the recording interval before it is determined that an accident has occurred according to a speed of the vehicle.

8. The recording device according to claim 7, wherein said recording control section sets the recording interval based on the speed such that the vehicle information is recorded each time the vehicle travels a distance of 3 m to 5 m.

9. The recording device according to claim 1, wherein when it is determined, upon detection of an impact, that an accident has occurred, and then another impact is detected, said recording control section causes said recording section to record an impacted portion of the vehicle as the vehicle information, without changing the recording interval.

10. The recording device according to claim 1, wherein said recording section is a FeRAM.

11. The recording device according to claim 1, wherein said recording control section records a current time detected by a radio-controlled clock in said recording section at the recording intervals.

12. The recording device according to claim 1, wherein said recording control section records information on weight detected by a sensor provided in a seat of the vehicle in said recording section at the recording intervals.

13. The recording device according to claim 1, wherein when it is determined that an accident has occurred, and then recording of the vehicle information obtained after the accident is terminated, said recording control section places said recording section in a write protect state.

14. The recording device installed in a vehicle, comprising:

a recording section that records vehicle information indicative of current conditions of the vehicle at predetermined recording intervals;

an accident level-determining section that determines whether or not an accident has occurred, based on a magnitude of an impact on the vehicle detected by an impact-detecting section; and

a recording control section that sets the recording interval before it is determined that an accident has occurred according to a speed of the vehicle.

15. A recording method, comprising:

recording vehicle information indicative of current conditions of a vehicle in a recording section at predetermined recording intervals;

determining whether or not an accident has occurred, based on a magnitude of an impact on the vehicle detected by an impact-detecting section; and

recording the vehicle information in the recording section at the recording intervals shorter than those before the accident when it is determined that that accident has occurred.

16. The recording method according to claim 15, wherein when it is determined, upon detection of an impact, that an accident has occurred, the recording interval after the accident is set according to a speed of the vehicle at the time when the impact is detected.

17. The recording method according to claim 16, wherein the recording interval is set based on the speed such that the vehicle information is recorded each time the vehicle travels a distance of 2 m to 3 m.

18. The recording method according to claim 15, wherein the recording interval before it is determined that an accident has occurred is set according to a speed of the vehicle.

19. The recording method according to claim 18, wherein the recording interval is set based on the speed such that the vehicle information is recorded each time the vehicle travels a distance of 3 m to 5 m.

20. The recording method according to claim 15, wherein when it is determined, upon detection of an impact, that an accident has occurred, and then another impact is detected, an impacted portion of the vehicle is recorded as the vehicle information in the recording section, without changing the recording interval.