Hyundai Sonata 2016 Owner's Manual page 685

H H E E V V ( ( H H Y Y B B R R I I D D E E L L E E C C T T R R I I C C V V E E H H I I C C L L E E ) ) S S Y Y S S T T E E M M
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 270V 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.
Electric motor Electric motor + Engine Engine Charging Engine OFF
Startup/Low speed cruise Acceleration High speed cruise Deceleration Stop
OLFH054001
H2