Scania to Launch New Euro 5 Truck Engine with EGR in 2007

7 December 2006

Scania will start introducing its new engine platform for Euro 5 during 2007. On these new engines, Scania uses EGR (exhaust gas recirculation) without any aftertreatment to meet Euro 5 emissions requirements.

This technology does not require the driver/operator to handle any additives (i.e., AdBlue for SCR) when refuelling and no extra installations are needed on the vehicle.

During 2007 Scania will start introducing a new range of Euro 5 engines with EGR and with the new Scania XPI common-rail fuel injection system, starting in the mainstream long-haulage segment.

The new engines meet Euro 5 without any fuel penalty.

—Hasse Johansson, Scania Group Vice President Research and Development

Scania introduced its first Euro 4 engines using EGR technology two years ago. Scania has since introduced a range of Euro 4 and Euro 5 engines using both EGR and SCR (selective catalytic reduction). (Earlier post.)

Scania EGR reduces the combustion temperature by recirculating a portion of the exhaust flow—up to 18% for Euro 4 and 25% for Euro 5—before the turbocharger and cooling it with the engine coolant before blending with the intake air, which in turn reduces the formation of nitrogen oxides (NO_x).

The challenge consists in feeding exhaust gases into the intake air, which has a higher pressure. Scania has solved this with a patented venturi system. The Scania venturi is a constriction in the intake manifold that makes the compressed intake air travel faster. This creates a low-pressure area downstream of the constriction, which is used to suck the exhaust gases into the intake air. A simple valve system is used to regulate the flow in relation to engine load.

The engines use high-pressure fuel injection in combination with a maintenance-free oxidizing catalyst to reduces particulates and eliminates the diesel smell.