Hyundai SANTA FE HYBRID 2021 Manual page 8

Foreword / Hybrid System Overview
The HYUNDAI Hybrid Electric Vehicle (HEV) uses both the gasoline engine and the
electric motor for power. The electric 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 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
Startup/Low speed cruise
1-8
Electric motor + Engine Electric motor + Engine
Acceleration High speed cruise
Engine Engine Charging Charging
Deceleration
Engine OFF Engine OFF
Stop
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