SubscribeCummins exhibits the Euro 4 ISBe military engines at DVD 2006. Cummins engines will meet the Euro 4 emissions legislation using Selective Catalytic Reduction (SCR) technology.
The SCR strategy for Euro 4 was formed around the ability to provide a total solution of engines, air handling and exhaust systems all under the Cummins umbrella. By working closely with Holset Turbocharging and Fleetguard Emissions Solutions, Cummins are in a unique position to provide a complete engine to exhaust package. The fully integrated engine management and after-treatment system is controlled and monitored from the engine's electronic control module, improving reliability, lowering cost and providing ease of installation. All components are warranted by Cummins.
How does the SCR system work?
During optimum combustion there are undesirable but unavoidable emissions of nitrogen oxide and nitrogen dioxide. These are commonly amalgamated and termed as NOx. In the SCR process a re-agent AdBlue (32.5% urea dissolved in water) is used to react with and neutralize the NOx. AdBlue which is a non toxic, odourless, non flammable liquid is injected into the exhaust system. The exact amount of AdBlue introduced into the system is precisely controlled by the electronic dosing unit. In the heat of the exhaust stream the AdBlue hydrolyses and ammonia molecules are released. The NOx and ammonia molecules react in the catalyst.
Nitrogen and water as steam are all that remain after the reaction. This is clean, safe technology as Nitrogen is completely harmless and makes up almost 80% of the air we breathe.
SCR System Schematic
The use of SCR has been driven by ever increasing customer demands. Cummins recognises the need for improved fuel economy, longer service intervals and higher vehicle uptime. David Moore, General Manager of Cummins Defence Business says "The new version of the ISBe is already providing all this and more, with the potential for substantial operational savings. In fact, compared to Euro 3, the fuel economy is improved by up to 7% with service intervals increased by over 60%."
Further advantages of SCR include improved durability due to optimised engine timing, allowing less unburned fuel to cause sooting in the oil. Sooting can be a major cause of engine wear. The SCR system has lower heat rejection compared with other emissions technologies, meaning that little change is required to the vehicle cooling system. The complete system is also supported by the Cummins service network.
Cummins Inc. is the world's largest independent manufacturer of diesel engines, and is a major supplier to the UK MoD, the US military and many other defence forces around the world. With over 28,000 employees, Cummins reported net income of $550 million on sales of $9.9 billion in 2005.
A substantial manufacturing presence in Europe includes the mid-range engine plant at Darlington UK and the high horsepower engine plant at Daventry, UK. Wherever they operate, Cummins engines are backed by the largest international parts and service network of any engine manufacturer, with over 5,000 outlets.
Millbrook, UK (June, 28 2006)
