9 April 2004

Sweden’s Scania has unveiled a new R-series range of long-haulage trucks. From September 2004—in addition to the full range of Euro III engines—the trucks will be offered with a 420 hp diesel engine compliant with the forthcoming Euro IV (October 2005) emission standards. The new engine meets Euro IV standards using advanced diesel engine technologies, without the use of exhaust gas aftertreatment.

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The Euro IV engine is a 12-liter, in-line 6 cylinder unit, producing 309 kW (420 hp) of power and 2100 Nm of torque. It features Scania high pressure fuel injection (HPI) for PM control. NOx emissions are controlled through the use of cooled EGR. The engine also features turbo-compounding which, among other functions, helps to control EGR.

Fuel economy in the R-series trucks with Euro III engines is up to 3% better than in previous truck models, due to improved aerodynamics, smarter control of engine auxiliaries, and lighter truck components. The Euro 4 engine shows unchanged fuel consumption compared to the equivalent Euro 3 engine, said Scania.

The Euro IV limits are 3.5 g/kWh for NOx and 0.02 g/kWh for PM. In comparison to Euro III, they require 30% lower NOx and 80% lower PM emissions. The Euro IV stage is roughly comparable to the US 2004 emission standards, the latter having more stringent NOx requirements (2 g/bhp-hr), but more relaxed PM limit (0.1 g/bhp-hr).

Scania claims the credit for the first truck engine with turbo-compounding, which entered series production in 1991. Turbo-compounding was later dropped, but was re-introduced in 2001 on the 12-liter, 470 hp, Euro III engine.

Source: Scania