Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1981-09-21
1984-07-31
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
180272, G08B 2100
Patent
active
044633475
ABSTRACT:
A drowsiness alarm system for a vehicle which gives an alarm to the vehicle driver when detecting a vehicle steering condition such as to indicate a state of drowsiness, thus preventing driving in an increasing state of drowsiness. The drowsiness alarm system, according to the present invention, comprises: (a) a steering angle detection circuit which outputs a first pulse whenever the vehicle driver turns the steering wheel in either of the clockwise and anticlockwise directions in excess of a predetermined angle; (b) a quick steering detection circuit which outputs a second pulse whenever the number of the first pulses reaches a predetermined number within a predetermined period of time; and (c) an alarm unit which gives an alarm in a predetermined form to the vehicle driver in response to the second pulse fed from the quick steering detection circuit. Furthermore, to ensure more accurate detection of the state of drowsiness, there may be provided in the drowsiness alarm system a frequency of steering detection circuit which outputs a third pulse when detecting an increasing frequency of steering changes, a vehicle speed sensor for inhibiting the alarming when the vehicle speed is below a predetermined value, or a vehicle condition responsive circuit for inhibiting the alarm when detecting that the vehicle travels in predetermined states such that the vehicle driver should not become drowsy, according to various vehicle driving conditions other than vehicle steering condition.
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Seko Yasutoshi
Yanagishima Takayuki
Nissan Motor Company Ltd.
Swann III Glen R.
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