Not everyone is moving to SCR. Cummins, International, MAN and Scania are sticking with EGR for Euro 5 and EPA2010. Last I heard, CAT isn't doing any on-highway engines 2010 on forward.
Do the same emissions laws apply to off-road and stationary engines as on-highway?
Should be interesting to see how consumers react to SCR in the long-run.
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Originally Posted by JCL
To meet North American exhaust emissions laws on the new diesels introduced this year, BMW has moved to Selective Catalytic Reduction (SCR) to reduce NOx. This system is known as Bluetec, or Adblue, or by other names depending on the manufacturer.
The system injects urea (made from uric acid, commonly cow urine) into the exhaust. The ammonia reacts with the NOX, and you end up with cleaner exhaust. The urea tank needs to be replenished, usually after 10,000 miles or so.
BMW diesels in other markets don't have the same emissions requirements (their regulations typically focus more on CO emissions than on NOx). So, this is a new system this year for diesels in the US and Canada. Not sure if it will be coming to Europe, but I expect so, just not sure when.
There have been reports of ammonia smell with the X5 diesel in North America. I suggested in an earlier thread that it may be the urea tank or injection system malfunctioning. In normal operation, urea injection shouldn't cause an ammonia smell. It may just be new model introduction issues. I trust they will resolve it, but in the meantime it will be a pain (and a smell....)
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