Not sure how the urea system works over in the USA, on your pick-ups.......but we run 2 types of urea here on the 6.7 Cummins......

The ones at our garage are 'euro 4.0'...2 sensors in exhaust..one before and one after the silencer...Air is injected constantly through injector in downpipe, till exhaust temps reach 200C...then the urea is injected......therefore cutting emmisions.....

A pal of mine, his garage runs the newer 'euro 4.5'...that has 3 sensors in exhaust system..4.5 has a cat also........same as 4.0...air injected etc.....

Run out of urea on the 4.0...it puts a light on the dash.........out of urea on the 4.5...engine drops to 1/2 power and puts light on.......Both use approx 5% urea against diesel......

Aparantly the Vehicle Inspectorate...(DoT) can plug in a scanner , say on the road, and look/download the info if you have been running without urea...

Also from what I picked up.....once a fault is in the ECM....its there for life.......Date/time/etc......even if a fault is repaired..its still logged....

Definately big brother......

 

yet another reasone to keep my 5.9

 

cbrahs,
you got that right...... I have to assume that the aftermarket urea biznis will soon ramp up and it will be just another additive like Power Service.

 

See, also, "BOHICA".

 

I thin other MFR's should license Honda's new diesel catalyst (or develop their own)...it produces it's own urea.

http://world.honda.com/investors/ann...t/2007/07.html

"By contrast, our own developed NOx catalyst for next-generation diesel engines converts NOx to N2 by using ammonia, which is generally regarded as an excellent cleaner. We use a two-layer structure, generating the ammonia inside that catalyst. The first layer absorbs the NOx in exhaust gases and converts it to ammonia, while the second absorbs the converted ammonia and uses it to clean the NOx in the exhaust gas to N2. This method avoids the hassle of supplying urea periodically, results in a compact and lightweight catalyst and improves NOx cleaning performance in the range in which diesel engines mainly operate—between 200°C and 300°C. The end result is cleaner exhaust gases."

 

Perty sure that is what the NOX filter does on the new 6.7 trucks. On the C&C the NOX filter can't be used due to the duty cycle, hence the adding of area to the C&C system in 2010.

 

I bet there is allot less waiting around to get the restroom key at diesel stations.

Jim

 

I think I read somewhere that the makers in the US were considering sensors that would first set off a warning light, then maybe a more severe warning, before finally going into limp mode...

On a related topic, does anyone have any idea how much this Urea solution would cost, and how many miles a typical driver might get out of a gallon?


Supposidly Urea injection motors could meet emissions without an exhaust recirculation system, particulate filter or fuel using regeneration or 3rd injection event?


If the result was a motor cleaner than the 6.7 that got as good MPG as the 555 HO, and the trade off was another jug to fill each oil change, like the washer fluid...

 

I assume urea can be made from cheap common household ammonia and water.

MikeyB

 

The EPA had huge issues with urea injection due to worries that owners wouldn't fill them. Urea injection has been in use in Europe for several years, but the EPA has been reluctant to approve it's use...until recently.

The solution for passenger cars was to make the urea tank last as long as a regular service interval. E.g. the urea tank lasts until the next oil change, at which point urea is added.

According to documents from the former DaimlerChrysler:
The company counters that since an average of around 0.1 liters per 100 km (2,352.15 mpg of AdBlue or 1 to 3 percent of diesel consumption) is all that is required, the tank can be designed so that it only needs to be refilled when service staff are carrying out regular, scheduled maintenance.

 

I know I keep harping on about what we have here...obviously thats all I have to go on......but....According to some literature I got from Cummins UK....Our 6.7's in the buses run approx 5% urea......
100 gallons diesel ...5 gallons urea..........

As to cost.........We are paying around $10.10 for a gallon of diesel....We get urea a bit cheaper as we buy it in thousands of liters ata time...cost works out around 49 cents a litre.......

 

I still think it's cheaper to whiz in the tank.

 

On the UK 6.7 that uses urea, does it have an exhaust gas recirculation system and particulate filter?

What kind of MPG do they get?

At $.49/l I think I'd trade having to fill a urea tank for not having the EGR and filter, especially if it gets better fuel efficiency...

That is unless the urea stuff is priced like "liquid gold"...

 

I see a new product from Lazarsmith. SS urea tank with a in-cab receptical.

MikeyB

 

i think you are right on how they are going to do it . and new dispensers will have to be added at every station