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A method of controlling the idling rpm of an internal combustion engine which rotatively drives an alternating-current generator through an output shaft thereof. The method is adapted to detect a value of a parameter indicative of the field current of the generator which is varied by regulator means

A method of controlling the idling rpm of an internal combustion engine which rotatively drives an alternating-current generator through an output shaft thereof. The method is adapted to detect a value of a parameter indicative of the field current of the generator which is varied by regulator means in response to electrical load applied on same, and control an actuator operable to vary output torque produced by the engine through the output shaft, in response to the detected value of the parameter when the engine is operating in an idling condition, to thereby control the engine rpm in a manner such that the value of the field current becomes equal to a predetermined value.

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1. A method of controlling the rotational speed of an internal combustion engine during idling operation thereof, said engine having an output shaft, an actuator operable to vary output torque produced by said engine through said output shaft, an alternating-current generator driven by said engine t

1. A method of controlling the rotational speed of an internal combustion engine during idling operation thereof, said engine having an output shaft, an actuator operable to vary output torque produced by said engine through said output shaft, an alternating-current generator driven by said engine through said output shaft for rotation therewith, said alternating-current generator being adapted to generate electric power in an amount corresponding to a value of field current flowing therein and the rotational speed of said engine, and regulator means adapted to vary the value of said field current of said alternating-current generator in response to electrical load applied on said alternating-current generator, the method comprising the steps of: (a) detecting a value of a parameter indicative of said field current of and applied electrical load on said alternating-current generator; (b) determining whether or not said engine is operating in an idling condition; and (c) controlling the operation of said actuator in response to the detected value of said parameter to vary said output torque of said engine, to thereby control the rotational speed of said engine such that the value of said field current of said alternating-current generator becomes equal to a predetermined value approximately equal to the value required for the applied electrical load on said alternating-current generator, when it is determined that said engine is operating in said idling condition. 2. A method as claimed in claim 1, wherein said step (c) comprises comparing the detected value of said parameter with a predetermined value corresponding to said predetermined value of said field current, controlling said actuator in a manner such that said output torque of said output shaft is increased to increase the rotational speed of said engine when it is determined that the detected value of said parameter is larger than said predetermined value thereof, and controlling said actuator in a manner such that said output torque is decreased to decrease the rotational speed of said engine when it is determined that the detected value of said parameter is smaller than said predetermined value thereof. 3. A method as claimed in claim 1, wherein said predetermined value of said field current is set at a value close to but smaller than a rated load value of said field current of said alternating-current generator. 4. A method as claimed in claim 1, further comprising determining whether or not the rotational speed of said engine is larger than a predetermined lower limit value when it is determined that said engine is operating in said idling condition, wherein said actuator is controlled to bring the value of said field current to said predetermined value thereof by said step (c) only when it is determined that the rotational speed of said engine is larger than said predetermined lower limit value. 5. A method as claimed in claim 1, wherein said actuator controls the air/fuel ratio of an air/fuel mixture being supplied to said engine. 6. A method as claimed in claim 1, wherein said actuator controls the quantity of an air/fuel mixture being supplied to said engine. 7. A method as claimed in claim 1, wherein said actuator controls the quantity of air being supplementally supplied to said engine. 8. A method of controlling the rotational speed of an internal combustion engine during idling operation thereof, said engine having an output shaft, an actuator operable to vary output torque produced by said engine through said output shaft, an alternating-current generator driven by said engine through said output shaft for rotation therewith, said alternating-current generator being adapted to generator electric power in an amount corresponding to a value of field current flowing therein and the rotational speed of said engine, and regulator means adapted to vary the value of said field current of said alternating-current generator in response to electrical load applied on said alternating-current generator, the method comprising the steps of: (a) detecting a value of a parameter indicative of said field current of and applied electrical load on said alternating-current generator; (b) determining whether or not said engine is operating in an idling condition; (c) determining whether or not the detected value of said parameter is larger than a first predetermined value; (d) determining whether or not the detected value of said parameter is smaller than a second predetermined value which is smaller than said first predetermined value; (e) controlling the operation of said actuator in a manner such that said output torque of said engine is increased to increase the rotational speed of said engine when it is determined at said step (b) that said engine is operating in said idling condition and at the same time it is determined at said step (c) that the detected value of said parameter is larger than said first predetermined value; and (f) controlling said actuator in a manner such that said output torque is decreased to decrease the rotational speed of said engine when it is determined at said step (b) that said engine is operating in said idling condition and at the same time it is determined at said step (d) that the detected value of said parameter is smaller than said second predetermined value, to thereby control the rotational speed of said engine such that the value of said field current of said alternating-current generator is maintained within a predetermined range which includes the value required for the applied electrical load on said alternating-current generator, when it is determined that said engine is operating in said idling condition. 9. A method as claimed in claim 8, wherein said first and second predetermined values of said parameter are set at values close to but smaller than a value corresponding to a rated load value of said field current of said alternating-current generator. 10. A method as claimed in claim 8, further comprising determining whether or not the rotational speed of said engine is larger than a predetermined lower limit value when it is determined that said engine is operating in said idling condition, wherein said actuator is controlled to maintain the value of said field current within said predetermined range by said steps (e) and (f) only when it is determined that the rotational speed of said engine is larger than said predetermined lower limit value. 11. A method as claimed in claim 8, wherein said actuator controls the air/fuel ratio of an air/fuel mixture being supplied to said engine. 12. A method as claimed in claim 8, wherein said actuator controls the quantity of an air/fuel mixture being supplied to said engine. 13. A method as claimed in claim 8, wherein said actuator controls the quantity of air being supplementally supplied to said engine.