Hyundai TUCSON Hybrid Owner's Manual page 59

Foreword / Hybrid system overview
Engine generation
When the vehicle is stopped, the high-
voltage battery is charged up by the
engine.
Regeneration
The high-voltage battery is charged up
by the regenerative brake system.
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Engine brake
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The engine braking is used to decelerate
the vehicle.
Power reserve
The engine is simultaneously used to
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drive the vehicle and to charge up the
high-voltage battery.
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