Tiffin Motorhomes ALLEGRO BREEZE, Руководство пользователя

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C U M M I N S E N G I N E S
4-5
Aftertreatment Operation
Diesel Particulate Filter
Soot is composed of the partially burned particles of fuel that occur during normal engine operation
(black smoke).
Ash is composed of the partially burned particles of engine oil that occur during normal engine operation.
Over time, both soot and ash accumulate in the DPF and must be removed. Soot is removed by a
process called regeneration. Ash is removed by removing the DPF and cleaning it at specified intervals.
A vehicle with an ATS has up to four additional indicator lamps on the dashboard. These additional
lamps, along with the check engine lamp, alert the operator of the status of the ATS.
Ultra low sulfur diesel fuel is required for an engine equipped with a DPF. If ultra low sulfur diesel is not
used, the engine might not meet emissions regulations, and the DPF or DOC can be damaged.
To maximize the maintenance intervals of the DPF, Cummins Inc. recommends the use of a lubricating
engine oil meeting Cummins Engineering Standard 20081. The use of oil meeting CES 20081 also
requires the use of ultra low sulfur diesel fuel to maintain the specified oil drain interval without risk of
engine damage.
Regeneration
Regeneration is the process of converting the soot collected in the DPF into ash.
Under some operating conditions, such as low speed, low load, or stop and go duty cycles, the engine
may not have enough opportunity to regenerate the DPF during normal vehicle operation. When this
occurs, the engine will illuminate the DPF lamp to inform the vehicle operator that assistance is required,
typically in the form of operating the vehicle at highway speeds for approximately 20 minutes.
Heat is required for the regeneration process to occur. Regeneration can be classified into two different
types: passive regeneration and active regeneration.
Passive Regeneration
Passive regeneration occurs when the exhaust temperatures are naturally high enough to oxidize the soot
collected in the DPF faster than the soot is collected.