Integrated Starter Generator In 2001, DENSO launched the world’s first belt-driven integrated starter generator (ISG) that integrated the starter with the alternator. DENSO’s small, long-life ISG allows the engine to instantly and quietly restart after the idle stop.

ISG Functions

• The ISG instantly and quietly restarts the vehicle’s engine after the idle stop.
  
• As a conventional alternator, the ISG produces electric power when the vehicle is running, and supplies the electric power to electric devices and/or charges the battery.
  
• The ISG can help to decelerate the vehicle by generating electric power, which is called regenerative braking. The electric power generated charges the battery, reducing fuel consumption.
  
• If a clutch disconnects the ISG and the compressor from the engine during the idle stop, the ISG can drive the air-conditioning compressor via a belt.

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