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#3262914 - 01/28/14 05:37 PM Urea injection for diesel
wemay Offline


Registered: 04/04/12
Posts: 2624
Loc: S. Florida
Why do some vehicles require this, i.e., Chevy Cruze Diesel and others do not, like the Jetta TDI? What is the main purpose?
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#3262922 - 01/28/14 05:45 PM Re: Urea injection for diesel [Re: wemay]
Quattro Pete Offline


Registered: 10/30/02
Posts: 26497
Loc: Michigan
Urea is used to help meet more stringent emissions requirements. TDIs will soon utilize urea as well. Some TDI applications already use urea (Passat, Touareg).

http://en.wikipedia.org/wiki/Diesel_exhaust_fluid
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#3262925 - 01/28/14 05:47 PM Re: Urea injection for diesel [Re: wemay]
PandaBear Offline


Registered: 08/05/02
Posts: 12554
Loc: Silicon Valley
Originally Posted By: wemay
Why do some vehicles require this, i.e., Chevy Cruze Diesel and others do not, like the Jetta TDI? What is the main purpose?



The main purpose is to get rid of the high NOX emission on diesel. Some cars don't require it because they run rich once in a while to provide enough HC and CO to be burnt and neutralize with the NOX. With urea you do not have to do that (and in theory can run at higher efficiency overall).
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#3262931 - 01/28/14 05:50 PM Re: Urea injection for diesel [Re: wemay]
wemay Offline


Registered: 04/04/12
Posts: 2624
Loc: S. Florida
thanks guys
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#3262938 - 01/28/14 05:55 PM Re: Urea injection for diesel [Re: wemay]
JHZR2 Offline



Registered: 12/14/02
Posts: 34212
Loc: New Jersey
It is a reagent in the catalytic process to get rid of NOx. In the USA, we're held hostage by California's geography and thus we can call 8 MPG SUVs "partial zero" emissions vehicles, while diesels are "gross polluters" when they return 50 MPG - and are forced to have this claptrap.

Actually Id rather have urea than not, and go another route. I think the processes to prevent NOx in diesels are worse than the aftertreatment...

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#3262944 - 01/28/14 05:59 PM Re: Urea injection for diesel [Re: wemay]
wemay Offline


Registered: 04/04/12
Posts: 2624
Loc: S. Florida
'claptrap' LOLOL...
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#3262970 - 01/28/14 06:18 PM Re: Urea injection for diesel [Re: wemay]
Eddie Offline


Registered: 12/07/03
Posts: 6844
Loc: Florida, Cape Coral
Like the PPM [censored] when comparing a 10 mpg vehicle to a 40 mpg vehicle. Thank you auto industry lobby.
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#3262971 - 01/28/14 06:18 PM Re: Urea injection for diesel [Re: wemay]
AP9 Offline


Registered: 07/10/13
Posts: 219
Loc: Chicago suburbs
Standard three-way catalytic converter doesn't really work on diesels, since they are stratified-charge engines that run very lean and therefore have too much oxygen in the exhaust.

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#3263117 - 01/28/14 08:13 PM Re: Urea injection for diesel [Re: wemay]
edwardh1 Offline


Registered: 01/17/03
Posts: 1685
Loc: Coastal South Carolina
what is the cost of the urea

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#3263123 - 01/28/14 08:17 PM Re: Urea injection for diesel [Re: edwardh1]
AP9 Offline


Registered: 07/10/13
Posts: 219
Loc: Chicago suburbs
DEF (urea in 32.5% solution with water) runs about $6/gallon in store, or under $3/gallon at truck stops with DEF pumps.

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#3263300 - 01/28/14 11:17 PM Re: Urea injection for diesel [Re: wemay]
TiredTrucker Offline


Registered: 01/04/08
Posts: 1189
Loc: Kellogg, IA
I would have much rather the Urea/SCR thing would have been done first instead of the EGR [censored]. I don't care for any of this stuff, but having all emissions stuff handled outside the engine is a far better way to do it than making an engine eat it's own feces. As a side note, it has been shone that they can reduce EGR because of the SCR, and this in turn allows the engine to be more efficient and in turn the DPF doesn't have to do regens as frequently. Now, if they could just do away with the EGR, things might be more tolerable.
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#3263600 - 01/29/14 09:52 AM Re: Urea injection for diesel [Re: wemay]
Stephen M. Offline


Registered: 10/12/05
Posts: 15
Loc: Vincennes, IN.
The Chevy Cruze does in face have a Urea injection system. The storage tank is located in the trunk.

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#3263609 - 01/29/14 10:04 AM Re: Urea injection for diesel [Re: Stephen M.]
Quattro Pete Offline


Registered: 10/30/02
Posts: 26497
Loc: Michigan
Originally Posted By: Stephen M.
The Chevy Cruze does in face have a Urea injection system.

Yuck. smile
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#3263616 - 01/29/14 10:20 AM Re: Urea injection for diesel [Re: wemay]
wemay Offline


Registered: 04/04/12
Posts: 2624
Loc: S. Florida
Chevy advises to fill every 10k mi or so. Out of curiosity, what would happen if you failed to do so?
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#3263676 - 01/29/14 11:07 AM Re: Urea injection for diesel [Re: wemay]
A_Harman Offline


Registered: 10/01/10
Posts: 4464
Loc: Michigan
The vehicle would go into a limp home mode until you refilled the urea container. I think if you go past a given number of miles with the urea system empty, it will refuse to start.
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