7 Series E65 740i (N62TU) SAL
•
Rail pressure sensor
For resetting the data map, the BMW diagnosis system has the service function "Mean quantity adaptation".
Elektronic oil level check
For the first time, the diesel engines in the E65MU series have an electronic oil level check.
A precondition for an accurate display of the oil level is:
The vehicle must be level and the engine at operating temperature.
The DDE then calculates the engine oil level with the help of the oil condition sensor.
The engine oil level measured can be shown on the Control Display (CD).
To do this, call up the oil level check in the "Vehicle Data" menu.
All possible display messages can be found in the Owner's Handbook.
The display is updated for the first time approximately 5 minutes after the start of the journey. After this update,
the engine oil level is measured continuously. The display is then updated at 20 minute intervals.
Regeneration of the diesel particulate filter
The level of charge of the diesel particulate filter is calculated by the DDE using the operating statuses of the
engine. The diesel particulate filter can be regenerated continuously and/or cyclically.
•
Continuous regeneration:
In operating ranges where the exhaust gas temperature is higher than the ignition temperature of the soot
(> 350
°
C):
The nitrogen dioxide (NO
2
) found in the exhaust gases starts to oxidise the soot.
No heat is given off during this process.
The nitrogen dioxide is formed from nitrogen monoxide (NO) in the oxidation catalytic converter.
The oxidation catalytic converter is mounted near the engine, thus favouring the continuous regeneration
effect.
In operating ranges where the exhaust gas temperature is higher than the ignition temperature of the soot
(> 350
°
C):
If the exhaust gas temperature is lower than 300
°
C, the soot particles that form are collected in the diesel
particulate filter.
•
Cyclical regeneration
This process is controlled by the signals from the exhaust back pressure sensor and the exhaust
temperature. Like continuous regeneration, cyclic regeneration takes place without any noticeable effects
on vehicle behaviour.
Cyclical regeneration is carried out according to the engine load. The intake air is thereby throttled
specifically (throttle valve via electrical throttle valve actuator in combination with 1 or 2 post injections.
This increases the exhaust temperature to approximately 600
°
C. The remaining oxygen (O
2
) enables
combustion of the soot. The regeneration of the diesel particulate filter can last about 20 minutes during this
process.
The diesel particulate filter is regenerated at the latest after every 1000 km. This regeneration takes place
at an earlier stage during short journeys. The DDE calculates the time for the regeneration using the
kilometres travelled each time the engine is started and the average vehicle speed.
Notes for service staff
The following information is available for service staff:
SBT M57TU2 and M67TU diesel engines E65, E66
BMW AG - TIS
12.02.2013 02:23
Issue status (12/2007) Valid only until next DVD is issued
Copyright
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