Drowsiness detecting apparatus and method

Details Drowsiness detecting apparatus and method Drowsiness detecting apparatus and method

2008-07-08

2008-07-08

Nguyen, Phung T. (Department: 2612)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S576000, C701S001000

Reexamination Certificate

active

11159147

ABSTRACT:
A drowsiness detecting apparatus has a pulse wave sensor and a determination circuit. The sensor is provided to a steering wheel to detect a pulse wave of a vehicle driver gripping the steering wheel. The determination circuit generates a thorax pressure signal indicative of the depth of breathing by envelope-detecting a pulse wave signal of the sensor and determines whether the driver is drowsy by comparing a pattern of the thorax pressure signal with a reference pattern. The display and the buzzer notify the driver and any other passengers in the vehicle of the drowsiness of the driver by a visual indication and buzzing sound, respectively. A body surface motion may be used as a signal that indicates the depth of breathing.

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