7 Series E66 750Li (N62TU) SAL
Brief description of components
The following altered components are described for both diesel engines:
-
Piezo injector
A hydraulic coupler and a shift travel valve in the piezo injector are actuated by a piezo element (no solenoid
coil).
The piezo-electric actuation system offers the following advantages:
•
The injector nozzle moves twice as fast, mainly due to a reduction of approximately 75% in inertia.
•
Gear transmissions are 5 times faster with a very short idle time.
•
Improved metering of multi-port injections.
•
The injector nozzle has a more accurate idle stroke
•
Less electricity is consumed because no holding current is needed.
•
A compact design reduces weight by aproximately 33%
This leads to clear improvements with regard to harmful emissions, fuel consumption and sound level.
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Oil condition sensor
The oil condition sensor increases the function range of the thermal oil level sensor.
The oil condition sensor measures the following values:
•
Engine oil temperature
•
Oil level
•
Engine oil quality
The DDE then evaluates these measurements. The oil condition sensor also determines the engine oil's
electrical properties. These properties alter when the engine oil shows signs of degradation and ageing.
The DDE calculates the length of the oil change intervals using these altered material properties.
In the future, the DDE will make information on engine oil quality available for the Condition Based Service
(CBS). At the moment, the fuel consumption is still being used to calculate the oil changing intervals.
[more ...]
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Diesel particulate filter
The diesel particulate filter has a catalytic coating and absorbs the soot particulates in the exhaust. The stored
soot particulates are continuously burned off at exhaust temperatures above approximately 300
°
C. The stored
soot particulates are cyclically burned off at exhaust temperatures above approx. 600
°
C. Special accessories
are not needed.
The diesel particulate filter requires some additional components:
•
Throttle valve
•
One exhaust temperature sensor upstream of the catalytic converter and one exhaust temperature sensor
upstream of the particulate filter.
•
Exhaust backpressure sensor
The throttle valve restricts the intake air flow under certain operating conditions. In combination with 1 or 2 post-
injection phases, this brings about an increase in the exhaust temperature (regeneration of the diesel particulate
filter).
The exhaust temperature sensors serve to control exhaust gas temperature during cyclical regeneration.
As another variable, the exhaust temperature upstream of the diesel particulate filter is measured. The exhaust
back-pressure sensor's reading of the exhaust counter pressure allows the diesel particulate filter to be
SBT M57TU2 and M67TU diesel engines E65, E66
BMW AG - TIS
13.02.2013 09:10
Issue status (12/2007) Valid only until next DVD is issued
Copyright
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