Toyota Prius c 2014 Owner's Manual page 27

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When stopped/during start off
The gasoline engine stops* when the vehicle is stopped. During
start-off, the electric motor (traction motor) drives the vehicle. At
slow speeds or when traveling down a gentle slope, the engine
is stopped* and the motor is used.
*: However, when the hybrid battery (traction battery) needs to be
charged or while the engine is being warmed up, the gasoline
engine may not stop automatically. (→P. 26)
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During normal driving
The gasoline engine is predominantly used. The electric motor
(traction motor) charges the hybrid battery as necessary.
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When accelerating sharply
The power of the hybrid battery (traction battery) is added to that
of the gasoline engine via the electric motor (traction motor).
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When braking (regenerative braking)
The electric motor (traction motor) charges the hybrid battery
(traction battery).
Vehicle Proximity Notification System
When the gasoline engine is off while driving, a sound is produced to
warn pedestrians, people riding bicycles or other people and vehicles
in the surrounding area that the vehicle is approaching. The pitch of
the sound adjusts according to vehicle speed. When vehicle speed is
approximately 16 mph (25 km/h) or more, the warning system turns
off.
1-1. Hybrid system
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