Automatic underspeed warning system

An underspeed warning system for a motor vehicle having left and right turn signals, comprising:

• speed sensing means for outputting a speed sensing signal proportional to the speed of said motor vehicle;
• means for providing a reference speed signal;
• comparator means for comparing said speed sensing signal to said reference speed signal and outputting an underspeed signal when said speed sensing signal is less than said reference speed signal;
• at least one warning indicator;
• driver means for activating said at least one warning indicator in response to said underspeed signal;
• and
• turn signal disable means for inhibiting said driver means from activating said at least one warning indicator when at least one of said turn signals is active.

An underspeed warning system for a motor vehicle having left and right turn signals and including a circuit for producing a direct DC speed signal proportional to the speed of the vehicle, said warning system comprising:

• means for providing a reference speed signal;
• comparator means for comparing said direct DC speed signal to said reference speed signal and providing a underspeed signal when said direct DC speed signal is less than said reference speed signal and an overspeed signal when said direct DC speed signal is greater than said reference speed signal;
• at least one warning indicator;
• driver means for activating said at least one warning indicator in response to said underspeed signal;
• and
• turn signal disable means for inhibiting said driver means from activating said at least one warning indicator when either or both of said turn signals are active.

An underspeed warning system for a motor vehicle having left and right turn signals and including a circuit for producing a direct DC speed signal proportional to the speed of the vehicle, said warning system comprising:

• means for providing a reference speed signal;
• comparator means for comparing said direct DC speed signal to said reference speed signal and providing a underspeed signal when said direct DC speed signal is less than said reference speed signal and an overspeed signal when said direct DC speed signal is greater than said reference speed signal;
• at least one warning indicator;
• driver means for activating said at least one warning indicator in response to said underspeed signal;
• a reset switch;
• and
• latch means for inhibiting said driver means from activating said at least one warning indicator until said overspeed signal is output from said comparator means after the last activation of said reset switch.