Installation Manual

Electrical & Electronic Application And Installation Manual
Production Release Version 1.0
Page 208
16.0 Aftertreatment System Machine Integration
16.1 Aftertreatment System Operation
The Perkins 1204F & 1206F product ranges use various combinations of
aftertreatment technologies. In each case the chosen technologies have
been selected as the optimal combination to meet the Tier 4 Final/Stage IV
emissions standards. The table below provides details of the 1204F to 1206F
product configurations.
Tier 4F Aftertreatment Technology
Engine
Power Kw
Aftertreatment
Regeneration
1204F 70 - 110 DOC / SCR Low Temp Regen
1204F 105 - 130 DOC / SCR Low Temp Regen
1204F 105 - 130 DOC/DPF/SCR Low Temp Regen
1206F 116 - 151 DOC/DPF/SCR Low Temp Regen
1206F 151 - 225 DOC/DPF/SCR Low Temp Regen
Table 16.1 Tier 4F Aftertreatment Technology
16.1.1 DOC Operation
The DOC consists of a ceramic substrate coated with an oxide mixture and a
catalyzing metal. The engine DOC is required to perform the following
functions;
• Remove CO and HC portions of the engine exhaust gas.
• Oxidize NO to NO2 to help reactions at both the DPF and SCR.
16.1.2 DPF Operation
The Diesel particulate filter is required to capture and then remove soot
particles from the engine exhaust via low temperature regeneration.
16.1.3 SCR Operation
The SCR unit or Selective catalyst reduction unit is required to specifically
target the removal or conversion of NOx particles into N2, H2O and CO2.
16.2 Low Temperature Aftertreatment Regeneration System
All Tier 4 Final/Stage IV 1200 series products are supplied from the factory
fitted with an exhaust backpressure valve as standard to aid exhaust system
thermal management. One of the main uses of the exhaust backpressure
valve during engine operation is to provide sufficient exhaust temperature for
the regeneration of the Aftertreatment system.
16.2.1 Low Speed Regeneration 1204F DOC + SCR only
For the applications prone to operating at low loads for prolonged periods of
time, an aftertreatment regeneration event could be required. The
aftertreatment regeneration strategy uses control functionality which
continually monitors the health of the aftertreatment system, employing
measures to artificially elevate exhaust system temperatures when necessary.
This strategy will operate at the normal idle speed of the application and