V90 User Manual - Page 463

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STARTING AND DRIVING
461
internal combustion engine with extra
electrical energy.
Electric motor - Powers the car in electric
operation. If necessary, provides extra tor-
que and power during acceleration. Pro-
vides electrical all-wheel drive functional-
ity. Recycles brake energy to electrical
energy.
Related information
•
General information about Twin Engine
(p. 412)
•
Starting and stopping the combustion
engine in Twin Engine (p. 461)
•
Drive modes (p. 462)
•
Gearbox (p. 454)
•
Factors that affect range when running on
electricity (p. 471)
Starting and stopping the
combustion engine in Twin Engine
An advanced control system determines the
extent to which the car is driven on internal
combustion engine, electric motor or both in
parallel. During electric operation, the car
may sometimes need to start the internal
combustion engine automatically due to
external circumstances, e.g. in low outside
temperatures, which is completely normal. In
addition, the internal combustion engine
always starts when the hybrid battery rea-
ches its lowest state of charge.
Climate settings at low temperatures
In low outside temperatures, the internal com-
bustion engine sometimes starts automatically
in order to achieve the desired passenger
compartment temperature and air quality. The
amount of time that the internal combustion
engine runs can be affected by
•
lowering the temperature
•
reducing the fan strength
•
activating drive mode 
Pure.
Electric operation in low or high
temperatures
In low or high outside temperatures, the car's
range and output for electric operation may be
reduced and affect how often the internal
combustion engine is started automatically.
Emission control
To ensure that emission control operates as
energy-efficiently as possible, the internal
combustion engine must be run for several
minutes once it has been started. The duration
of the internal combustion engine's running
time varies depending on the temperature of
the catalytic converter.
Related information
•
Drive systems (p. 460)
•
Economical driving (p. 470)
•
Drive modes (p. 462)
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