AVL sees common diesel baseline engine possible to help meet N. America, Japan and European emissions limits

Diesel Fuel News, March 17, 2003

Although neither the U.S. nor Japan seem likely to adopt urea-SCR for NOx control later this decade, while Europe seems headed that way, it's still possible to conceive of a low-NOx/PM baseline diesel engine for all of these ultra-low-emissions mandated markets, AVL explained in a paper (SAE 2003-01-0344) here.

If notional Euro-6 heavy-duty NOx limits are around 1 g/kW-hr (versus 0.27 g/kW-hr EPA 2010) then more engine-out emissions reduction might be required if 80% (minimum) efficiency urea-SCR can be ensured. Cooled EGR might aid the strategy if Euro-6 NOx limits are even lower, AVL said. A common strategy with the "least consequences on the base engine design will be the most competitive system." That would include high-pressure injection (up to 2,000 bar), cooled EGR, twin-flow turbo with wastegate and a "combustion system developed for tolerating high EGR rates," the researchers said.