DIESEL PARTICULATE FILTER REGENERATION PROCESS OPERATION[MZ-CD 1.6 (Y6)]

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High Power-Euro 4


Initiating regeneration

•  For regeneration of the diesel particulate filter, the PCM is equipped with a separate data record.
•  The decision on whether, and if so when, regeneration has to take place must be made by two different software applications:
―  Supervisor software.
―  Manager software.
•  The supervisor software decides on the basis of the following parameters whether regeneration should be carried out:
―  Soot load of the diesel particulate filter (value of the diesel particulate filter differential pressure sensor).
―  Distance travelled.
―  Operating conditions driven.
―  Favourable conditions for regeneration.
―  Probability of improved conditions in the near future.
•  By taking these parameters into account, it is possible to achieve minimum fuel consumption levels, minimum oil dilution and optimum performance whilst the vehicle is in operation. If the Supervisor software makes the decision that regeneration should be carried out, the Manager software is informed.
•  The Manager software monitors the regeneration process and constantly interrogates the following inputs:
―  Engine coolant temperature.
―  Intake air temperature.
―  Fuel temperature.
―  Exhaust gas temperature.
―  Manifold absolute pressure.
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Supervisor software
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Manager software
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Regeneration
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Regeneration is to take place
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Monitoring of the regeneration


Regeneration process

•  After the Supervisor software has enabled regeneration, the following actuations occur in two stages:
Stage 1
―  Shut‐off of the EGR system.
―  Actuation of the guide vanes of the turbocharger to deliver minimum boost pressure.
―  Driver does not accelerate.
Stage 2
―  Opening of the air bypass.
―  Closing of the intake throttle valve.
―  Advanced post injection.
―  Retarded post injection.
•  If regeneration has commenced, it will be completed, regardless of the operating condition of the engine. Regeneration is only stopped then by shutting off the engine. Regeneration is started again once acceptable operating conditions are detected by the system. Regeneration takes a maximum of 10 minutes.


Regeneration cycle

•  The post injections result in high oil dilution and must therefore be kept within limits.
•  To avoid excessively high oil dilution, a minimum driving distance has to be maintained between two regeneration cycles (approx. 350 km {217.5 mile}).
•  Depending on operating conditions, the diesel particulate filter is regenerated every 350 to 1,000 km {217.5 to 621.3 mile}.
•  Regeneration cycles are increased depending on ash content, which increases with every regeneration of the diesel particulate filter.
•  As the ash content increases, the pores of the diesel particulate filter become increasingly clogged. This means that regeneration cycles also become increasingly shorter.
•  For this reason, the diesel particulate filter has to be replaced at a defined maintenance interval (every 120,000 km {74564.5 mile} at the time of going to print).