1 Series E81 130i (N52K) 3-door
•
Mass air flow sensor
•
Injectors
•
Rail pressure sensor
For resetting the data map, the BMW diagnosis system has the service function "Mean quantity adaptation".
Regeneration of diesel particulate filter (only on M57TU in E60/E61)
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 or cyclically.
•
Continuous regeneration:
In operating ranges in which the exhaust temperature is higher than the ignition temperature of the soot (>
350
°
C), the soot particulates are immediately converted. This involves the slow oxidation of the soot
particulates to carbon monoxide (CO) and carbon dioxide (CO
2
).
The nitrogen dioxide present in the exhaust (NO
2
) acts as the oxidizing agent. The nitrogen dioxide is
formed from nitrogen monoxide (NO) in the oxidation catalytic converter.
If the exhaust temperature is insufficient for this process, the soot particulates are initially collected and
stored in the diesel particulate filter and then burned off the next time the exhaust temperature is increased.
•
Cyclic regeneration:
If the driving pattern does not permit continuous regeneration of the diesel particulate filter (e.g. long
periods of low engine load in urban traffic conditions with low exhaust temperatures), selective regeneration
is initiated.
This process is controlled by the signals from the exhaust backpressure sensor and the two exhaust
temperature sensors. Like continuous regeneration, cyclic regeneration takes place without any noticeable
effects on vehicle behavior.
Dependent on the engine load, the regeneration is performed by selective restriction of the intake air flow in
combination with 1 or 2 post-injection phases. This increases the exhaust temperature to approx. 600
°
C.
The remaining oxygen (O
2
) enables combustion of the soot. The length of the regeneration cycle for the
diesel particulate filter may be several minutes. The intervals between regeneration cycles depend on the
conditions under which the vehicle has been operated over the last 500 kilometers. At high exhaust
temperatures, continuous burn-off of soot particulates means that less soot is stored.
In addition, the diesel particulate filter is regenerated every 700 to 2,500 kilometers (depending on driving
pattern). If the exhaust backpressure sensor or one of the exhaust temperature sensors fails, the diesel
particulate filter is regenerated every 500 kilometers.
Notes for service staff
Service staff should note the following points:
-
General notes: [more ...]
-
Diagnostics: [more ...]
-
Encoding/programming: ---
-
Car and Key Memory: ---
Subject to change.
SBT EURO 4 exhaust emission regulations and E-OBD for M47TU diesel engines M47TU, M5
BMW AG - TIS
22.01.2013 13:16
Issue status (12/2007) Valid only until next DVD is issued
Copyright
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