초록 ▼

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

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.

대표청구항 ▼

[ What is claimed is:] [1.] An idling speed control method for an internal combustion engine, in which a field current of an alternator is turned on and off to control a power generation rate of the alternator in accordance with a terminal voltage of a battery, and an air intake of the internal comb

[ What is claimed is:] [1.] An idling speed control method for an internal combustion engine, in which a field current of an alternator is turned on and off to control a power generation rate of the alternator in accordance with a terminal voltage of a battery, and an air intake of the internal combustion engine is increased or decreased to keep an engine speed at a target speed during an idle operation of the engine, such that, when an electric load suddenly increases during the idle operation of the engine, the field current of the alternator is gradually increased toward a field current value corresponding to the suddenly increased electric load, comprising:detecting the battery voltage;estimating a battery current consumption value from a state of change in the detected battery voltage;determining a generated current value of the alternator without directly detecting current generated by the alternator;calculating a target value of an electric load current to be outputted from the alternator, based on the estimated battery current consumption value and the determined current value of the alternator; andincreasing the air intake based on the calculated target value of the electric load current,wherein said air intake is increased when a first set value is exceeded by the calculated target value of the electric load, and an increment of said air intake is set based on a difference between the calculated target value and a second set value, andwherein said intake air is increased only when such detected battery voltage decreases to an extent that charging of the battery is required due to the determined alternator current value.