User Manual - Page 699

For 2017 HYUNDAI SONATA PLUG-IN HYBRID.

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H2
Hybrid Vehicle
HHEEVV ((HHYYBBRRIIDD EELLEECCTTRRIICC VVEEHHIICCLLEE)) SSYYSSTTEEMM
The HYUNDAI Hybrid Electric Vehicle (HEV) uses both the gasoline engine and the electric motor for power.The elec-
tric motor is run by a high-voltage HEV battery.
Depending on the driving conditions, the HEV computer selectively operates between the engine and the electric motor
or even both at the same time.
Fuel efficiency increases when the engine is off at idle, or when the vehicle is driven by the electric motor with the HEV
battery.
The HEV battery charge must be maintained, so at times the engine will come on even at idle to act as a generator.
Charging also occurs when decelerating or by regenerative braking.
OLFH054001
Startup/Low speed cruise
Electric motor
Acceleration
Electric motor + Engine
High speed cruise
Engine
Deceleration
Charging
Stop
Engine OFF
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