Converting an RV to Run on Vegetable Oil
Honda Forms Solar Cell Subsidiary

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

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 (NOx).

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.

Comments

Thomas Pedersen

Great news. Emissions are no good!

While important for long haul trucks, I'd say this technology is even more important in buses that travel in urban areas. Unless the superior ENOVA hybrid bus concept is used, of course.

John Ard

How does Euro 5 compare with Tier2Bin5?

allen_Z

Not as stringent on NOx, more so on PM. There are also different standards for gasoline and diesel vehicles, and between trucks and cars:

http://bioage.typepad.com/.shared/image.html?/photos/uncategorized/euro5d.png
http://en.wikipedia.org/wiki/European_emission_standards

Peter Ahlvik


Good news that they can make it without catalytic aftertreatment. The bad news is that this engine will have higher PM, HC and CO (if anybody bothers about CO...) emissions than engines with catalytic particulate filters. The best of two worlds would be the Scania engine with aftertreatment to achieve a significant lower emission level than Euro 5.

BR Peter

Verify your Comment

Previewing your Comment

This is only a preview. Your comment has not yet been posted.

Working...
Your comment could not be posted. Error type:
Your comment has been posted. Post another comment

The letters and numbers you entered did not match the image. Please try again.

As a final step before posting your comment, enter the letters and numbers you see in the image below. This prevents automated programs from posting comments.

Having trouble reading this image? View an alternate.

Working...

Post a comment

Your Information

(Name is required. Email address will not be displayed with the comment.)