JPS5613222A - Device for alarming driving in a doze - Google Patents

Abstract

PURPOSE: To eliminate the possibility of detection leakage and improve the precision of detection of awakeness by permitting the detection of the awakeness through addition of a plurality of awakeness signals such as steering angle, steering force, yawing, lateral G, etc.

CONSTITUTION: When signals from a steering angle detection circuit 11, a steering force detection circuit 2, and a yawing detection circuit 3 are coupled to decision circuits 4aW4c, each decision circuit compares the change of each signal per unit period of time and a preset reference value and provides a decision signal (i. e., awakeness signal) if the change exceeds the reference value. These decision signals are coupled through an OR circuit 5 to a counter 6 and also coupled to respective monostable multivibrators 10aW10c. A counter 6 counts the decision signals, and when the first and second counts are reached, it provides the first and second alarm signals through respective switches 16a and 16b to alarm circuits 7 and 12. When all the decision circuits are turned on, it drives the alarm circuit 12 through an AND circuit 11.

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