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Ricardo and Doosan unveil DL06 Tier 4 engine without DPF

11 October 2013

Ricardo and Doosan Infracore presented details of the latest DL06 engine at the 22nd Aachen Colloquium on Automobile and Engine Technology. The new version of the DL06 features the Ricardo Twin Vortex Combustion System (TVCS) and meets the Tier 4 final emission standards without a diesel particulate filter (DPF).

The Doosan DL06 engine is a turbocharged and intercooled 5.9 liter, in-line 6-cylinder diesel engine used in nonroad applications. It features a 4-valve per cylinder head with a central vertical injector location and high pressure common rail fuel injection system. Typical applications for the engine are excavators and wheeled loaders, made by Doosan and its subsidiaries such as US manufacturer, Bobcat. The engine is also used in onroad vehicles, said Ricardo, but no example applications were provided.

The Tier 4 final version of the DL06 is equipped with cooled EGR and urea-SCR aftertreatment to reduce NOx emissions. The engine meets PM emission standards without the need for a DPF. The ultra-low particulate combustion is achieved using the Ricardo TVCS concept to improve homogeneity of air-fuel mixing, adequate air-fuel ratio at all conditions by balancing the EGR rates and boosting system match, and high fuel injection pressures and appropriate nozzle specification for good atomization.

In January, Doosan announced the application of Ricardo’s TVCS in 1.8, 2.4 and 3.4 L engines up to 99 hp. The Ricardo TVCS technology has also been used on JCB engines.

Ricardo said earlier that is was exploring the potential to extend the TVCS combustion to larger engine sizes. The latest announcement, however, does not suggest that the application of the TVCS system has been expanded to higher power (or higher power density) applications. The TVCS applications that have been announced by Doosan or JCB are limited to approximately 130-140 kW.

Source: Ricardo