Doosan Solution : EGR + DOC + SCR


The goal of the emission regulation is to target the pollutants that are produced when a diesel engine combusts fuel. EGR technology reduces the production of Nitrogen Oxides (NOx) in a combustion chamber by recirculating exhaust gases back into the engine. It lowers the engine’s NOx output, but increases Particulate Matter (PM).

This gives increased NOx out of the engine, which is then treated by injecting an urea solution also known as AdBlue® (also known as DEF or Diesel Exhaust Fluid) into the exhaust flow turning the NOx into harmless Nitrogen gas and water vapor.

For Stage IV, the combined use of EGR and SCR makes cleaning so effective that engines chosen can manage without the added bulk and complexity of a DPF. These technologies also have great potential for future development. After-treatment system is ‘DPF-FREE’, thanks to a VGT (Variable Geometry Turbocharger) and DOC and further improvement of existing components such as EGR (Exhaust Gas Recirculation).

The Scania Stage IV Engine exhaust and after-treatment system for instance consists of 5 main components:

  1. 1. A VGT produces optimized boost pressure to result in higher combustion efficiency, higher power and torque, and less pollutant emissions.
  2. 2. An Exhaust Brake works as a kind of cooling system heater to help the engine get the desired operating temperature easily and so produce less pollutant elements.
  3. 3. The DOC has two functions. It converts Hydrocarbons (HC) and Carbon Monoxide (CO) to non-harmful substances and it also acts as a heater to keep the exhaust gas at high temperature.
  4. 4. The Evaporator is a dosing module of Adblue®. It has a noise cancelling structure inside and Adblue® is sprayed then mixed with exhaust gas.
  5. 5. The SCR Catalytic Convertor is a final device where exhaust gases are treated and it functions as a muffler, too. It has a palladium coated surface inside and a NOx sensor installed.


SCANIA DC09 and DC13 engines

Proven in Stage IIIB and over hundreds of thousands kilometers in heavy truck industry, Scania DC09 and DC13 provide best in class engines. Scania masters both emission control technology EGR and SCR to handle emissions in the most effective way. Both reduce by different means the NOx and PM. When it comes to PM, the engine meets the engine regulations even without the use of a DPF. This eliminates possible downtime for filter regeneration and saves fuel.

Scania DC09 DC13



Doosan DL06 and DL08 engines

From outstanding simplicity and reliability, Doosan DL06 and DL08 engines provide a high efficiency. DL06 & DL08 engines are Stage IV compliant by using only EGR & SCR after-treatment systems. Fuel injection technology guaranties a low level of PM without requiring a DPF which ensure low operating costs.

Doosan DL06

For the Excavators DX225LC-5, DX235LCR-5, DX235NLC-5, DX255LC-5, as well as all Wheeled excavators models, and for the Wheel loaders DL220-5, DL250-5 Doosan will use its own engine, the DL06.

Doosan DL06


Doosan DL08

For the Excavators DX300-5, DX340-5, Wheel loaders DL300-5 and DL350-5, Doosan will use its own engine, the DL08.

Doosan DL08


Perkins 1204F

To meet the latest, stringent emissions legislation for Stage IV, Doosan has decided to equip the Crawler excavators DX140LC-5, DX140LCR-5, DX180LC-5, as well as the Wheel loader DL200-5 with Perkins1204F-E44TA engine.

The 1204F range is available as single turbocharged and series turbocharged, air-to-air charge cooled, 4.4 liter, 4 cylinder units. Their high power density, combined with excellent torque, enables Doosan to select this engine where previously they may have used an engine of a higher cubic capacity. This downsizing represents a cost saving and creates more space to package the new after treatment units.

Perkins 1204F