Drowsiness alarm system for a vehicle
First Claim
1. A drowsiness alarm system for a vehicle for producing a warning in the event of driver drowsiness as determined from vehicle steering changes, comprising:
- (a) an alarm unit which produces an alarm in a predetermined form in response to a pulse inputted thereto;
(b) a steering angle sensor which generates a signal indicative of the angle through which a steering wheel is turned;
(c) a steering angle detection circuit, connected to said steering angle sensor, which outputs a pulse each time the vehicle steering angle changes by a predetermined amount; and
(d) a quick steering detection circuit, connected to said steering angle detection circuit, for outputting a pulse to said alarm unit whenever the number of pulses from said steering angle detection circuit inputted thereto within a predetermined period of time following receipt of the first of said steering angle detection circuit pulses exceeds a predetermined number,whereby said alarm unit is activated in response to detection of an abrupt or sudden steering operation.
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Accused Products
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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Citations
30 Claims
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1. A drowsiness alarm system for a vehicle for producing a warning in the event of driver drowsiness as determined from vehicle steering changes, comprising:
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(a) an alarm unit which produces an alarm in a predetermined form in response to a pulse inputted thereto; (b) a steering angle sensor which generates a signal indicative of the angle through which a steering wheel is turned; (c) a steering angle detection circuit, connected to said steering angle sensor, which outputs a pulse each time the vehicle steering angle changes by a predetermined amount; and (d) a quick steering detection circuit, connected to said steering angle detection circuit, for outputting a pulse to said alarm unit whenever the number of pulses from said steering angle detection circuit inputted thereto within a predetermined period of time following receipt of the first of said steering angle detection circuit pulses exceeds a predetermined number, whereby said alarm unit is activated in response to detection of an abrupt or sudden steering operation. - View Dependent Claims (3, 4, 5, 8, 9, 10, 11, 14, 15, 16, 17, 18, 21, 22, 23, 24, 25, 26, 28, 29, 30)
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2. A drowsiness alarm system for a vehicle for providing a warning in the event of driver drowsiness as determined from vehicle steering changes, comprising:
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(a) an alarm unit which produces an alarm in a predetermined form in response to a pulse inputted thereto; (b) a steering angle sensor which generates a signal indicative of the angle through which a steering wheel is turned; (c) a steering angle detection circuit, connected to said steering angle sensor, which outputs a pulse each time the vehicle steering angle changes by a predetermined amount; and (d) a frequency of steering detection circuit, connected to said steering angle detection circuit, for outputting a pulse to said alarm unit whenever the pulses from said steering angle detection circuit have a predetermined timed relationship with one another and the number of such pulses within a predetermined period of time exceeds a predetermined number whereby the alarm is produced whenever the number of steering operations exceeding the predetermined amount of change of the steering angle within the predetermined period of time exceeds the predetermined number. - View Dependent Claims (6, 7, 12, 13, 19, 20, 27)
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Specification