Euro6 diesel emissions controls
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  1. #1
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    Default Euro6 diesel emissions controls

    I was hoping that SCR/AdBlue would mean the end of combustion temperature control by way of 'cooled 'exhaust gasses via the EGR valve.
    However the specs for the latest Tiguan list both SCR and exhaust gas recycling.
    EGR fouling is still with us it seems and the costs associated with fixing the problem also, unfortunately.


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    Last edited by Nagaman; 6th April 2017 at 01:19 PM.

  2. #2
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    It's not surprising. Diesels have an excess of air for combustion, so reducing the oxygen and lowering the temperatures required to form NOx is the first step. Urea/SCR chemically alters what's left.

  3. #3
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    Default Euro6 diesel emissions controls

    [Quote QUOTE=seasink;1512772]It's not surprising. Diesels have an excess of air for combustion, so reducing the oxygen and lowering the temperatures required to form NOx is the first step. Urea/SCR chemically alters what's left.[/unquote

    Those articles I've read about the benefits of DEF as post combustion treatment have indicated that by not reducing combustion temperature there was a more complete burn, thus reducing particulate matter whilst getting more power and economy (and lower CO2 also).
    Supposedly ~ 90% of the subsequent NOx problem is eliminated by the DEF AdBlue.
    All I want for Xmas is a long term reliable diesel without an inevitable EGR issue if you hang on to it long enough.




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    Last edited by Nagaman; 6th April 2017 at 03:06 PM.

  4. #4
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    It's possible. Scania has a 13 litre diesel without EGR, but it drinks AdBlue. It's a high torque low revving engine though, and needs a large additive tank.

    My understanfing is that the rpm range of cars makes the job difficult at low loads and temps without EGR.
    Last edited by seasink; 6th April 2017 at 03:40 PM.

  5. #5
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    This is a current (Mar 2017) U.S. rundown on Mercedes' BLUETEC diesel emissions systems.
    No mention of exhaust gas recirculation though
    https://www.thoughtco.com/how-merced...c-works-533859


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  6. #6
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    I think the V6 Merc has an EGR too. The Euro V form of the engine did.

  7. #7
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    Default Euro6 diesel emissions controls

    Quote Originally Posted by seasink View Post
    I think the V6 Merc has an EGR too. The Euro V form of the engine did.
    Euro5 yes
    But Euro6 needs it too combined with SCR
    And PSA have their own (non owner designed for servicing) catalyst treatment system on top of that.
    BH!


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