Lexus 2012 RX450h Owner's Manual page 35

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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.
During normal driving
The gasoline engine is predominantly used. The electric motor
(traction motor) charges the hybrid battery as necessary.
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).
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 approx-
imately 12 mph (20 km/h) or more, the warning system turns off.
1-1. Hybrid system
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