Problematic EGR systems problems solved using Dual EGR canisters?

Discussion in 'Ask An Owner Operator' started by Thane, Jan 15, 2019.

  1. AModelCat

    AModelCat Road Train Member

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    EGR duty cycles have been lowered since the adaptation of SCR technology. Some of the newest generation engines coming out in the off-road segment (emission standards are now pretty much identical to on-road standards) don't even have EGR. All the emissions targets are met by solely using the aftertreatment systems.
     
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  3. 25(2)+2

    25(2)+2 Trucker Forum STAFF Staff Member

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    There was some difference in opinion about that, and DEF usage in the truck I was assigned increased over time, also odor from the reaction(SCR) increased as well when doing a parked regeneration.

    The red farm tractors(Massey and International) used DEF heavily, the green ones tried to get by with less, they were running Maxxforce truck engines in their parts fleet, but no longer doing that, either.

    Sidenote, had to idle or bake or freeze running regional, and engine had 15k hours on it when lease company took it back. 460k miles.
     
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  4. Derailed

    Derailed Road Train Member

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    So is it safe to say short haul and local guys with lots of stop and go should still avoid a newer emmisions motor?
     
  5. AModelCat

    AModelCat Road Train Member

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    Some manufacturers (I believe CAT is one of them) use an AMOx catalyst behind the SCR to remove that nasty odour from the DEF/NOx reaction.
     
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  6. Thane

    Thane Medium Load Member

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    Like I said, I don't know as much about the emissions control systems as I'd need to to be an O/O. But if you're on O/O wanting to keep running a glider kit after 21/22, you're going to have to put a system on it. Why not put on two systems if they're troublesome, have one as a backup you can go to when the main system is acting up? The newer systems are supposedly better. But will a newer system work on a 2004 DD? Or are we talking about having to replace the engine, too?
     
  7. AModelCat

    AModelCat Road Train Member

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    2 systems would be extremely impractical (not to mention extremely expensive). Frame space to mount just one aftertreatment system is already scarce on a lot of trucks. Plus you're going to add a lot of unneccessary weight and double the amount of electrical problems.
     
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  8. Thane

    Thane Medium Load Member

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    Yeah, it would. It'd keep you off the side of the road broke down or doing a parked regen. You'd run on only one system at a time and go to the secondary system when you needed to. The secondary could get you to a terminal or a shop, or it could get you to your break, where you'd do your regen. It'd also save you a tow and unscheduled down time. No more parked regens. No more 55 mph derates. No more days lost in a dealer shop a thousand miles from home. The secondary device could be made much smaller, like a donut spare tire in a car trunk.
     
    Last edited: Jan 15, 2019
  9. Thane

    Thane Medium Load Member

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    Could you put just two canisters in it inside the box? Keep most of it as a single unit. Have only the critical parts repeated. I think this can be done.
     
  10. pushbroom

    pushbroom Road Train Member

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    No. It cant. If you understood how the system works and all of the componets required you would understand why it cant be done. Massively complicated and probably more failure prone then a normal system.
    Pitch it on shark tank.
     
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  11. AModelCat

    AModelCat Road Train Member

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    Plus I don't believe the ECM's have provisions to read/switch between 2 seperate aftertreatment systems.
     
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