A Comparative Study of CDA vs LIVC on 11L Diesel Engine and Stock After Treatment System

Diesel engines for commercial vehicles are called to deal with more stringent emissions regulations. Variable Valve Train solutions are a building block of the strategy to meet new emissions limits. Several studies are available combining CDA or LIVC with upgraded engine architectures and after treatment systems. But what is the net contribution of CDA vs LIVC in regard to the engine emissions and fuel consumption? To answer this question Eaton, in collaboration with FEV, has executed an investigation on an 11L commercial engine and its stock after treatment system, by replacing the standard VT with Eaton switchable rockers capable to deliver either CDA and LIVC functions. CDA rockers have been installed on 3 cylinders, while LIVC rockers have been installed on all the cylinders. All the other engine components were kept as they are.