| 摘要 |
In a case where an occupant sleeps inside a vehicle for a long time while a heater or the like has been turned on, the occupant may be suffocated to death due to lowered concentration of oxygen within a closed interior space of the vehicle or due to a failure of an exhaust system of the vehicle, and the like. To prevent this, the occupant should be much careful of awaking from his/her sleep by setting an alarm function of an additional clock or the like before he/she sleeps. However, in a case where an occupant sleeps inside a vehicle, particularly after drinking, or an occupant sleeps inside a vehicle at a resting place or the shoulder of a rod due to his/her fatigue after driving for a long time, it is difficult to expect that the occupant would additionally set an alarm in advance to sleep. In the prior art, there were a method of sensing driver's sleepiness during traveling of a vehicle and awaking the driver from his/her sleepiness, or a technique for adding an alarm function manipulated directly by an occupant to a clock provided in a vehicle. However, the present invention provides a method and device for detecting a case where an occupant sleeps inside a vehicle for a predetermined period of time or greater, without an additional operation of the occupant for setting timer, or the like.
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