Doosan Begins Launch of New Trucks, Excavators and Loaders Meeting Stage IIIB Engine Emission Regulations
- 08 September 2011
- Company & Industry News
Scheduled for September 2011, the first of a new generation of articulated dump trucks (ADTs) will be unveiled by Doosan Infracore Construction Equipment, beginning a comprehensive series of product launches including new generation excavators and wheel loaders, to meet the requirements of the EU Stage IIIB engine emission regulations.
Throughout the product development process, Doosan’s primary concern has been to combine Stage IIIB engine technology with advanced features and developments in the new generation ADTs, excavators and wheel loaders that significantly increase performance and lower the total cost of ownership. As a result, all the new machines from Doosan offer the following:
â– Increased productivity
â– Higher fuel efficiency
â– Superior operator comfort and safety
â– Greater reliability
â– Extended durability and service life
â– Improved serviceability
Meeting Stage IIIB Engine Emission Regulations
Since 1996, the European Commission has been working to address emissions through European Directive 97/68/EC. The Directive focuses predominantly on reducing Particulate Matter (PM) and Nitrogen Oxide (NOx) emissions and is being implemented in various Stages. Stages I to IIIA of the Directive have been completed, resulting in a 65% reduction in PM and 60% decrease in NOx in Doosan products.
Stage IIIB regulations, which apply to equipment powered by diesel engines of 75 KW and above, are being introduced in 2011 and 2012. Compared to Stage IIIA, Stage IIIB requires a further reduction of 90% in PM and 50% in NOx. Stage IV will come into effect in 2014 and will reduce NOx by an additional 80%, almost completely eliminating both PM and NOx emissions.
As well as in Europe, various measures are being phased in throughout the USA, Canada and Japan. Stage IIIB corresponds approximately to Tier 4 Interim in the US. However, EU Stage IIIB compliance will only be certified for Europe and will not be valid for the US.
To meet the Stage IIIB engine emission regulations, Doosan has combined high pressure common rail fuel injection systems and the company’s Electronic Control Unit with two different emission reduction technologies:
â– EGR (Exhaust Gas Recirculation)
â– SCR (Selective Catalytic Reduction)
Using both technologies, Doosan has applied the best technical solution for each product category, with the choice depending on the engine’s characteristics as well as the application to ensure that each machine delivers the best performance and lowest operating costs.
The EGR technology is more suited to on-site machines where the requirement is for multi-task capabilities and has therefore been chosen for the new Doosan wheel loaders below 130 kW and for all the new Doosan wheeled and crawler excavators. These products are using the EGR technology associated with the Doosan and Isuzu engine ranges.
Particularly suited for machines requiring high torque or speed, the SCR technology is being used on the new Doosan ADTs and wheel loaders above 175 HP, all of which are powered by the renowned Scania range of engines.
EGR or SCR engines are not enough on their own to reduce emissions to Stage IIIB levels. As a result, Doosan has combined the engines with a selection of after-treatment measures. These include Catalytic Oxidation (DOC), Filtering (Diesel Particulate Filters or DPF), Regeneration (high temperature) and AdBlue®.
These measures are already widely used by car manufacturers. They clean the exhaust produced by the engine or convert it into water, nitrogen and carbon dioxide. The most suitable after-treatment system depends on the engine and Doosan has tailored the after-treatment to match the EGR and SCR systems in the company’s machines.
A choice of either DOC/DPF or SCR systems is enough to meet most requirements for Stage IIIB compliance. In order to meet more stringent Stage IV regulations, Doosan will use DOC/DPF and SCR technologies together in many of the ADTs, excavators and wheel loaders from the company.
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