| 摘要 |
<p>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 (2) which outputs a first pulse (6a) 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 (13) which outputs a second pulse (9a) whenever the number of the first pulses reaches a predetermined number within a predetermined period of time; and (c) an alarm unit (10) which gives an ,2 STEERING ANGLE DETECTION CIRCUIT alarm to the vehicle driver in response to the second pulse (9a) fed from the quick steering detection circuit (13) in a predetermined form. 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 (18) which outputs a third pulse (30a) when detecting an increasing frequency of steering changes, a vehicle sensor (16) for inhibiting the alarming when the vehicle speed is below a predetermined value, or a vehicle condition responsive circuit (101) 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.</p> |
