Sleepiness judging device

A judging device and drowsy technology, applied in medical science, diagnosis, instruments, etc., can solve problems such as inability to judge

Inactive Publication Date: 2010-03-31
TOYOTA JIDOSHA KK
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, such strong drowsiness cannot be judg

Method used

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Embodiment Construction

[0040] Hereinafter, embodiments of the drowsiness determination device according to the present invention will be described with reference to the drawings.

[0041] In this embodiment, the drowsiness determination device according to the present invention is applied to a drowsiness occurrence prediction device mounted on a vehicle that predicts the occurrence of a driver's drowsiness state. The drowsiness occurrence predicting device according to this embodiment determines a strong drowsiness state before becoming a drowsy state (a state several minutes to tens of minutes before the drowsiness state will occur) based on heart rate fluctuations. Inform the result of the judgment below.

[0042] Before concretely describing the drowsiness occurrence prediction device according to this embodiment, a method of determining a strong drowsiness state will be described in advance. First, terms used in this embodiment will be described. The heart rate fluctuation is a heart rate fluc...

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Abstract

A sleepiness judging device for judging a strong sleepiness before a subject comes to doze. Sleepiness judging device (1) is characterized by comprising a sympathetic parameter acquiring unit (2,11) for acquiring a parameter concerning the sympathetic nerve of a subject, a parasympathetic parameter acquiring unit (2, 11, 16) for acquiring a parameter concerning the parasympathetic nerve of the subject, a sympathetic increase judging unit (13, 14) for judging whether or not the magnitude of the sympathetic parameter is larger than a sympathetic threshold, and a sleepiness judging unit (19) forjudging the sleepiness of the subject from the increase/decrease relation between the sympathetic parameter and the parasympathetic parameter if the magnitude of the sympathetic parameter is judged tobe larger than the sympathetic threshold.

Description

technical field [0001] The present invention relates to a drowsiness judging device for judging drowsiness based on sympathetic nerve activity and parasympathetic nerve activity. Background technique [0002] In order for the driver of the vehicle to drive safely, a device for judging the driver's drowsiness (awakeness) has been developed. As a drowsiness judging device, there are, for example, extracting a feature quantity corresponding to drowsiness based on heart rate, eye blinking, etc., and comparing the feature quantity with a threshold value to determine very strong drowsiness (drowsiness state or a state about to doze off soon) . When extremely strong drowsiness is judged in this way, it is a drowsiness level that affects driving operation (for example, demeanor), and the judgment time lags behind. Therefore, in the device described in Patent Document 1, weak drowsiness is judged based on the low-frequency components of heart rate fluctuations correlated with sympa...

Claims

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Application Information

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IPC IPC(8): A61B5/18A61B5/0245G08B21/06G08G1/16
CPCA61B5/18A61B5/02405A61B5/4806A61B5/0245A61B5/4035
Inventor 畠山善幸
Owner TOYOTA JIDOSHA KK
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