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42
The ECM monitors driving style and selects a suitable time to
employ regeneration. Cars driven a lot at idling speed and
low load will attempt to regenerate earlier than cars driven
more with higher load and speed. For regeneration to take
place, a prolonged high exhaust temperature must be
obtained.
In the event of the car being driven in such a way that
regeneration is not possible, i.e., frequent short journeys, a
diagnostic trouble code will eventually be registered in
addition to the DPF light and “Check Engine” indicators
displaying. A service regeneration can be requested in the
workshop using the diagnostic tool.
DPF regeneration is used to clear PM (Particulate Matter)
from the DPF filter through continuous combustion oxidation
mode (such as high-temperature heating combustion, fuel
additive or catalyst reduce PM ignition combustion) to
stabilize the filter performance.
DPF regeneration may be performed in the following cases:
The exhaust back pressure sensor is replaced.
The PM trap is removed or replaced.
The fuel additive nozzle is removed or replaced.
The catalytic oxidizer is removed or replaced.
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