Speed control apparatus for an internal combustion engine

Claim 1

Apparatus for controlling the speed of an internal combustion engine, said apparatus comprising, in combination: a. a throttle valve arranged in an intake pipe of the engine; b. a speed control regulator including means for producing signals representative of the actual value and the desired value of engine speed, and comparator means, connected to said signal producing means, for producing a signal representative of the difference between the actual and desired speed values; c. throttle adjusting means, in constant mechanical connection with said throttle valve and connected to said speed control regulator, for actuating said throttle valve in dependence upon said difference signal during non-idling operation of the engine; d. means, connected to said throttle valve, for moving said throttle valve into its idling position when the voltage supply to the speed control regulator is interrupted; and e. means for supplying a voltage to aid speed control regulator comprising: (1) a voltage source; (2) first switch means, connected between said voltage source and said speed control regulator, for interrupting the voltage supply to said speed control regulator when the engine speed is below a minimum speed, said minimum speed being below the normal idling speed of the engine; and (3) pulse switch means, connected in parallel with said first switch means, for supplying a voltage pulse to said speed control regulator determinative of the starting position of said throttle valve.