Patent Document ID: 4564833
Application ID: 06377206
Patent Status: 1

Claim One:
1. A doze warning system for an automotive vehicle comprising: a steering angle detecting means for producing steering angle pulses at every predetermined angular variation of the steering, said steering angle pulses providing an indication of direction of the steering angle variation; a dozing detecting circuit including a first reset circuit means for counting up the steering angle pulses produced by the steering operation in the same direction and producing a curve signal when the counted value within a predetermined first period of time, measured from a time point of receiving the first steering angle pulse, reaches a first value; a second reset circuit means for producing a pulse interval signal when an interval between occurrences of the steering angle pulses is longer than a predetermined second period of time; a counter section means for counting said steering angle pulses and for producing a warning signal when a count of the steering angle pulses within the predetermined first period, reaches a second value, said counter section means resetting the count in response to said curve signal or said pulse interval signal; and a warning section for producing a warning when the warning signal is inputted.