What Is an Integrated Starter Generator?

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What Is an Integrated Starter Generator?
An integrated starter generator combines the starter and alternator of a vehicle into one part. (yellow car, a honda Japanese sport car model image by alma_sacra from Fotolia.com)

An integrated starter generator (ISG) is the combination of a starter, generator and flywheel system into one auto part. It is used to enhance fuel efficiency and vehicle performance on automobiles with combustion engines.

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Purpose

When a vehicle comes to a complete stop, the integrated starter generator switches the engine off. When the accelerator is pressed, it starts the engine again, thereby saving gas that is usually wasted when a vehicle is in idle.

Benefits

Integrated starter generators offer faster vehicle cranking than a 12-volt starter. Also, they save fuel by reducing idling time when a vehicle is stopped.

Other Functions

Regenerative braking -- which happens when a vehicle decelerates by way of electric power -- is aided by the integrated starter generator. Also, the ISG functions as an alternator by generating electric power in a running vehicle and charging the battery.

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