Mercedes-Benz 212 Sedan E-Class Service Manual page 13

BlueEFFICIENCY
7 ECO power steering pump
The ECO power steering pump is based on a conven-
tional pump with additional electronic control of the
flow rate. In straightline driving the flow is reduced to
a defined minimum. When the steering wheel is
turned, the delivery rate is increased to the necessary
level according to the vehicle speed. Reducing the
delivery rate during straightline driving decreases the
system flow pressure and therefore reduces the
system temperature and the fuel consumption.
8 Radiator shutters
The flow of cooling air through the cooling module and
engine compartment can be regulated by opening the
radiator shutters.
Closing the radiator shutters prevents the engine
compartment from cooling down at low outside
temperatures while increasing the heating power
available in the passenger compartment. In addition,
the aerodynamic drag of the vehicle decreases due to
the reduced input of cooling air (in the E 220 CDI,
E 250 CDI and E 350 CGI).
1 Radiator shutters open
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Introduction of the New E-Class, Model Series 212 Sedan
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9 Alternator management
The alternator is switched off-load when the charge
level is sufficiently high (80%). This means that the
vehicle is only supplied by the battery, and the battery
is charged only by occasionally coupling in the alter-
nator during brake applications and in deceleration
mode.
10 Engine optimizations
Engines with high outputs and low fuel consumption
are used. The 4-cylinder diesel engines feature 2-
stage turbocharging (in the E 220 CDI and E 250 CDI).
The 6-cylinder gasoline engine features direct injec-
tion instead of port injection (in the E 350 CGI).
11 Shift point display
The shift point is displayed in the multifunction display
of the instrument cluster. Based on information from
the engine control unit, the driver can always see
when he should change to a different gear in the inter-
ests of fuel economy. This enables the driver to opti-
mize his driving style to save fuel
(with 6-speed manual transmission).
2 Radiator shutters closed
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