Idling speed control method and apparatus for an internal combus

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36443103, 1233391, 1233391A, 12333918, 322 25, 322 29, 290 40A, 290 40C, G06G 770, F02M 300, H02H 706

Patent

active

057127867

ABSTRACT:
An idling speed control method and apparatus in which the field current of an alternator is turned on and off to control the power generation rate of the alternator in accordance with the terminal voltage of a battery, and the air intake of an internal combustion engine is increased and decreased to keep the engine speed at a target speed during an idle operation of the engine such that the field current of the alternator is gradually increased toward a field current value corresponding to an electric load when the electric load is increased suddenly. A battery current consumption value is estimated from the detected state of the battery, a generated current value of the alternator is detected, the value of an electric load current to be outputted from the alternator is obtained in accordance with the sum of the estimated battery current consumption value and the generated current value of the alternator, and the air intake is increased when a set value is exceeded by the electric load current value.

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