19
REGENERATION
See Engine Owner’s Manual for information on the Diesel Particulate Filter (DPF).
Particulate Matter (PM) in the engine exhaust accumulates in the Soot Filter (SF) within the
DPF causing it to clog, reducing engine performance. Therefore, it is necessary to burn off
the accumulated PM. This process is referred to as Regeneration. The Engine Control Unit
(ECU) uses components such as the DPF differential pressure sensor, temperature sensor,
and intake throttle to control assisted DPF regeneration automatically and prevent PM from
over-accumulating in the SF. The Yanmar engine uses a stepped approach of both Automatic
and Back-up regeneration modes. A detailed description of this process is provided the Engine
Owner’s Manual, but a brief summary is also provided below.
Automatic Regeneration Modes – These modes are performed automatically by the Engine
Control Unit and operate without input from the machine
operator or impact to mulching operations.
Self Regeneration (Normal) – Regeneration without the use of assistance devices
(e.g. intake throttle). During operation at high speed or high load, the exhaust temperature
rises to a sufficient level such that PM is continuously combusted and eliminated.
Assisted Regeneration – Regeneration with the use of assistance devices (e.g. intake
throttle). When the differential pressure in the SF inlet/outlet in the DPF rises, the differential
pressure sensor installed on the DPF detects the increase. The Engine Control Unit (ECU)
commands the intake throttle to adjust the amount of engine intake air to increase exhaust
temperature to a sufficient level such that PM is combusted and eliminated.
Reset Regeneration – Regeneration with the combined use of Assisted Regeneration and
post-injection. Approximately every 100 hours of operation, the Assisted Regeneration and
post-injection are automatically used together to control regeneration by increasing the
exhaust temperature to burn off and remove PM.
Back-up Regeneration Modes – These modes require direct action from the operator to be
performed and the machine cannot be used for mulching
operations while Back-up regeneration is underway.
Stationary Regeneration – Although the DPF performs the regeneration control, if the
operation conditions with idling at no load and low speed/low load operations are frequently
repeated, the PM may not be regenerated. If the ECU determines that performing the
Stationary Regeneration is required at this time, the operator will be alerted via the
control panel that a Stationary Regeneration is required. A Stationary Regeneration takes
approximately 30 minutes to complete.
Recovery Regeneration – Recovery Regeneration occurs when Stationary Regeneration
cannot be completed and the engine has gone into Limp Home Mode. The Recovery
Regeneration takes approximately 3 hours to complete. If the Recovery Regeneration is
unsuccessful, the Soot Filter will need to serviced by a Yanmar certified service center.
To Next Page
Loading...
