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Apr 6, 2011

EGR vs SCR * USA - Or, Navistar against the world

To Cut Smog, Navistar Blazes Risky Path of Its Own



(Photo by Peter Wynn Thompson/The New York Times)
Warrenville,ILL,USA -The New York Times, by By TOM ZELLER Jr. and NORMAN MAYERSOHN -4 April 2011: -- In a testing cell tucked deep in the bowels of Navistar’s engine plant and technical center here, a hulking prototype of a truck engine sits behind a large glass window like a patient on an operating table. A snarl of sensors and wires is attached to nearly every part of the humming engine, feeding reams of data to a battery of computers and watchful engineers in the adjacent control room... One measurement — for nitrogen oxide emissions, or NOx — is of particular concern to Navistar. From 2010 onward, all new truck engines must achieve tough, near-zero limits for NOx, a chief ingredient of smog. Virtually every truck maker besides Navistar chose to use an add-on system to their existing engines that uses a fluid cocktail to help neutralize the pollutant as it makes its way out of the exhaust...
Navistar went a different route, deciding to invest hundreds of millions of dollars to refine an engine that produces minimal NOx in the first place. At the same time, the company attacked the competing systems, suing federal air quality regulators and claiming that the add-on technology was so flawed that it failed to meet the clean-air requirements...   If Navistar’s engine works — the company recently submitted test results for the latest version to the Environmental Protection Agency for certification — it could be the simplest, most elegant solution to the vexing engineering problem of how to reduce smog created by diesel truck exhaust...  But the company would also have to persuade skeptical fleet owners to buy the engines. If those owners do not see a clear advantage in operating costs and fuel efficiency, Navistar could find itself stuck as the only engine maker promoting an alternative technology to the rest of the industry’s E.P.A.-approved approach...  The company has already paid a price for choosing the road less traveled. While its engines have been in development, its share of the United States market for the heaviest trucks fell to 20.2 percent this year, down from 28.5 percent in 2009, according to researchers at JPMorgan...  Diesel engines in the nation’s 18-wheelers, buses and other heavy-duty vehicles power less than 10 percent of all vehicle traffic in the United States, but they account for an outsize portion of the haze of pollution that hangs over many American cities — as much as 25 percent by some estimates...  Though the E.P.A. does not prescribe technologies for meeting its standards, it did suggest, back in 2001, that liquid urea would be an unlikely candidate. The system would require a whole new infrastructure for making urea available at truck stops across the country and would rely on drivers monitoring and refilling an on-board urea tank...  Even as it struggled to refine its technology, Navistar attacked its rivals’ approach. The company argued that the urea-based technology was ineffective in some circumstances, such as stop-and-go traffic — precisely when control of emissions is most needed. In addition, the company claimed that the urea system could be easily bypassed with simple tricks like putting water into the urea storage tank...

Caterpillar, a vehicle maker that recently unveiled a short-haul truck that uses a Navistar engine, said the Navistar approach would ultimately prove to be a winner. “The customer is looking for simplicity,” said George Taylor, general manager of Caterpillar’s on-highway truck group, “not technology.”


* USA - Navistar DT MaxxForce midrange gets EPA certification


Warrenville,ILL,USA -Today's Trucking -6 April 2011: -- Navistar International is inching closer to the EPA's 2010 0.20g NOx limit for its 2011 model year MaxxForce DT mid-range diesel...  The truckmaker announced that it has received certification from the EPA for the MaxxForce DT at 0.39 g/bHpHr NOx using Navistar’s EGR emissions solution...  The company says the certification represents a 22 percent emissions reduction from the original 0.50g certification and demonstrates progress to achieving the 0.20g standard... (Image from dieselpowermag: Nnavistar building the legendary assembly line)

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posted by Unknown @ 11:07 AM  0 comments

Sep 7, 2010

EGR vs SCR * USA - Navistar: Scrap current '10 engine rule; recall SCR trucks

As rivals often point out, while Navistar criticizes SCR systems' ability to comply with the 2010 standards, it does not yet have an engine that meets the EPA's 2010 NOx limit

Washington,DC,USA -Today's Trucking -2 Sept 2010: ... Navistar is now calling on the agency to force a recall of those engines currently in the market and introduce a new guidance that requires SCR engines to shut down immediately when out of diesel exhaust fluid (DEF)... A new rule should require SCR engines to employ sensors that "immediately" recognize the difference between proper DEF and the wrong fluid or an empty DEF tank, the company urges... At the meeting, in which competitors Daimler Trucks, Volvo and Cummins begrudgingly observed, Navistar demanded that regulators fix "loopholes" which allow trucks to continue operating in a derated mode if DEF runs out or is substituted with another liquid... In a video demonstration, Navistar showed that some trucks can operate without DEF for extended periods and freely driven up to 11,000 miles with water in place of DEF, thereby "illegally" relaxing -- Navistar claims -- the agency's own 0.20g NOx standard... SCR competitors counter that the demonstration is misleading since, in actuality, sensors would identify the NOx limits being breached and the system would initiate a derating "inducement," which would eventually shut the truck down at the next fuel fill-up interval... (Photo: SCR engine -left- and Navistar's MaxForce EGR engine -right-)

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Sep 1, 2010

EGR vs. SCR * USA - Navistar Urges Recall of 2010 SCR Engines

Wareensville,ILL,USA -Transport Topics, by Eric Miller -Aug. 30 2010: -- Navistar Inc. has urged U.S. and California environmental regulators to recall 2010-compliant heavy-duty truck engines using selective catalytic reduction emissions technology that the company claims can be defeated by drivers... Navistar said all 2010 SCR engines are “programmed to run without diesel emissions fluid, with the wrong fluid, with slush or frozen DEF or with the system disconnected” ... Navistar, the only manufacturer using exhaust gas recirculation rather than SCR to meet 2010 emissions standards, said the agencies must refuse to certify additional engines until a full review is conducted... EPA in the past defended its SCR engine-certification process and said the technology is effective. CARB’s Hebert said that for a recall to take place, regulators first would need to show that the engine being sold is not the same one that was certified for the marketplace, and they would have to show the engine was actually having a negative effect on emissions... An attorney representing sister firms Mack Trucks and Volvo Trucks North America said the manufacturers did not object to the EPA-Navistar legal settlement, but they are concerned with “the potential example EPA may be setting through this settlement” ... EPA and CARB also have been criticized by 11 members of Congress from California, who demanded in a letter that the agencies fix the “loophole” in the nitrogen oxides standard...


* SCR and EGR: Pros and cons

New York,NY,USA -Fleet Owner, by Wendy Leavitt -(originally published) Jul 1, 2008: ... While EGR and SCR are both proven paths to reducing NOx emissions, there are trade-offs associated with each approach.

SCR advantages:

* Permits more optimized combustion
* Can enable better fuel efficiency/power
* No concerns about engine durability/oil degradation
* End product is nitrogen, water and carbon dioxide
* Urea not classified as hazardous to health

SCR trade-offs:

* System adds weight
* Adequate urea supply infrastructure not yet in place
* Purchasing urea is additional cost
* System, including sensors and other compliance-related devices, must be maintained
* Urea freezes at 12 deg. F., so may require heated storage
* Most effective at constant speeds and high loads; least in stop/start
* Urea (also in some fertilizers) is a water pollutant/harmful to fish

Cooled EGR advantages:

* Does not require additional onboard hardware
* Does not require the use of an additional fluid
* No loss of payload
* No impact on service intervals
* No driver intervention necessary for compliance

Cooled EGR trade-offs:

* Increases heat rejection, creating need for greater cooling capacity
* Decreases power density, fuel efficiency
* Potential engine durability and oil degradation issues
* Less combustion efficiency produces increased particulate matter, hydrocarbon, carbon monoxide

Sources: Chevron Oronite Co. LLC; Scania; VDI, Germany, “Market Overview of Exhaust Gas Treatment Solutions for Diesel Engines in Commercial Vehicles for Meeting Current and Upcoming Emission Legislation in the EU”; Volvo Trucks NA, “SCR: For EPA ‘10”; Environmental Protection Agency Heavy-Duty On-Highway Center, Argonne National Laboratory

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Aug 11, 2010

SCR vs- EGR * USA - Daimler Trucks North America LLC, to the Trucking Industry

Don't trucking industry customers of North America deserve better?

Portland,OR,USA -DTNA press release -10 Aug 2010: -- "We had a decade to prepare for 2010 emissions standards and all but one heavy-duty trucking manufacturer invested the time, money and brainpower to develop the best technology to meet stringent new requirements. All but one manufacturer, Navistar, came to the same solution that would best serve you, our trucking industry customers of North America... Although we're competitors, the rest of us understood the importance of the larger cause, and we worked together to do our part to improve air quality for the safety of future generations. How can Navistar claim it's concerned about the environment while its proposed 2010 product spews two and a half times the 2010 NOx standard into the air we breathe every day?... Manufacturers, suppliers, government agencies and associations invested time and resources to develop innovations to achieve the emissions goal in spite of economic challenges because we know it's the right thing to do... Navistar is selling thousands of pre-2010 engines, while the rest of the industry is selling EPA 2010-certified products. Navistar apparently has no EPA-compliant emissions technology for 2010 and beyond, at least nothing that does not use credits to achieve compliance... Don't trucking industry customers of North America deserve better? We believe you do. And, as an industry that prides itself on professionalism, integrity and honesty, we have every reason to demand the same of Navistar... Learn more about SCR and watch real customers discuss the benefits of this technology." (Image from daimler-trucksnorthamerica: Portland, Ore., Truck Manufacturing Plant )

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Jul 23, 2010

EGR vs. SCR * USA - Daimler & Volvo, Responds to Navistar Contentions

The credibility or validity of the test published by Navistar cannot be judged without revelation of more details


(Video from YouTube, by ut06265 -9 April 2009)

El Monte,CAL,USA -RV Business -July 22, 2010: ... We run stringent fuel economy tests at Daimler Trucks North America (DTNA) which are both accurate and substantiated... The 440-mile test run by our competitor is not appropriate for testing modern EPA 2010-compliant trucks. Running such a short distance test tampers with the outcome by calibrating regeneration intervals to occur immediately before and immediately after the test is completed. DTNA’s BlueTec Detroit Diesel engines regenerate after thousands of miles, not hundreds of miles. The longer the test, the more realistic the results and the closer they are to what a customer would experience in real world operations. DTNA has built more than 3,000 EPA 2010-compliant Cascadias with DD15 engines and more than 2,000 full production vehicles are currently running every day in customer fleets. Numerous customers running real life tests had completely different results and they have found Freightliner to be the best solution... In order to get a truly accurate and reliable comparison between vehicles, the use of comparable products with equivalent drivetrain components is a must. We’re eagerly anticipating acquiring an EPA 2010 certified series production 12.4L MaxxForce engine in order to run our own comparison study... The company will not comment on technologies manufactured or actions taken by other companies...


* Volvo Group defends SCR at environmental workshop


(Video from YouTube, by VolvoTrucks -16 June 2010: Customers of Volvo Trucks North America share the positive experience they've had with their Volvo trucks and the new SCR technology)

El Monte,CAL,USA –Truck News (CAN) –22 July 2010: -- Representatives from Volvo Group, strongly defended the effectiveness of SCR and warned against revamping the regulations with the roll-out of EPA2010-compliant engines already well underway... Volvo raised the point that unjustifiably limiting engine torque excessively could cause safety concerns on the road or strand drivers in the middle of nowhere in adverse conditions... John Mies, vice-president, corporate communications with Mack and Volvo called out Navistar... "The fact is that a Mack or Volvo truck running at 0.2 grams (per brake hp/hr NOx) is and will continue to be much better for the environment than a Navistar truck running at 0.5 grams - and no amount of changes to the inducement strategies will change that," he said. "Let's make sure that what we do is truly in the interest of the environment and the public. And let's not penalize those who have worked with you in good faith, and reward those who are trying to manipulate the system for their own competitive advantage"... Volvo Group has already delivered more than 3,500 Volvo and Mack engines with SCR in North America and has received orders for more than 10,000...


* COMMENT on Linkedin "World of Trucks'"

By Tom Vondenhuevel (Salesman at S&S Volvo & GMC Truck. Lima,OH,USA) -22 July 2010: • I find it amusing that the only engine manufacturer who can not meet the 2010 standard would be the one to sue to try and stop those who can. Navistar is worrying about a drivers ability to somehow get around a system the actually meets the standard while their engines don't meet the standard to begin with! They have to use credits from pick up truck engine sells to offset the penalties of not meeting the standard. (... !!!)

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Apr 9, 2010

Opinion * USA - Engine Makers’ Rivalry Reaches Heated Level

Louisville,KY,USA -Transport Topics, by Howard S. Abramson -8 April 2010: -- This year’s version of the Mid-America Trucking Show here cast a bright light on the ongoing fractious debate over which engine technology makes the most sense for fleets that operate heavy-duty trucks in North America... While it’s not unusual for competitors to praise their products to the sky, it is quite unusual for them to denigrate those of their rivals... DTNA, along with its other competitors in the engine market — Paccar Inc., Volvo AB’s North American unit and Cummins Inc. — have chosen selective catalytic reduction to meet the new federal emissions rules that govern 2010-model trucks and later... Andreas Renschler, who runs Daimler’s global commercial vehicle unit, which includes DTNA and its Freightliner and Western Star brands, told reporters: “We never gambled” in choosing a technology path. He said, SCR is “the most fuel-efficient choice. We made a very severe decision a long time ago and there is no debate any longer that SCR works best”... Navistar, on the other hand, has chosen to use an advanced version of exhaust gas recirculation — the technology of choice for all the major players in meeting emissions rules from 2002 through 2009 — to accomplish the lower levels permitted by the new standard. Ustian and Navistar’s other managers said EGR was simpler, lighter and well proven, and it won’t require the driver to maintain an adequate supply of the diesel exhaust fluid necessary to make SCR work... While it’s impossible to predict who will win this argument, as usual, in the end the market will cast the votes that count...

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Jan 23, 2010

Lawsuit * USA - EPA Revises SCR Guidance for ’10 Engines

Washington,DC,USA -Transport Topics -21 Jan 2010: -- In a move designed to bolster its defense in a federal lawsuit filed by truck manufacturer Navistar Inc., the U.S. Environmental Protection Agency has revised its 2010 engine selective catalytic reduction guidance to remove a specific requirement limiting the hours and miles a truck can operate after its urea tank runs dry... The earlier guidance, the focal point of Navistar’s federal lawsuit filed last year, specifically required engine performance to be severely degraded after the truck travels 2,000 miles or 40 hours after the tank is urea tank is empty... The new guidance document eliminates the suggested limits on the hours and miles trucks can operate without sufficient levels of the urea solution before the trucks begin to lose power and eventually become inoperable...

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Jan 18, 2010

EGC vs. SCR * USA - EPA Revises Guidelines In Response To Navistar Complaint

Chicago,ILL,USA -CNN Money/Dow Jones, by Bob Tita -January 15, 2010: -- The U.S. Environmental Protection Agency has issued revised guidelines for complying with tougher emissions standards on diesel engines, a move intended to counter complaints by Navistar International Corp. that the agency's previous guidance was flawed... Navistar, which is suing the EPA over its certification process for a popular technology to reduce nitrogen oxide emissions, said the new guidelines are largely cosmetic. The company said truckers will still be able to operate 2010 model trucks for long stretches without a functioning pollution-reduction system... Illinois-based Navistar is the only truck maker in North America that is not treating nitrogen oxide with SCR, opting instead for a process that recirculates cooled exhaust through its engines... The company alleges in its lawsuit the EPA disregarded its own procedures and requirements to accommodate Navistar's competitors wishing to deploy SCR, which is already used on diesel engines in Europe. Navistar also says the agency provided a biased and incomplete record of comments and concerns about SCR...

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Oct 20, 2009

EGR vs SCR * USA - Navistar 2010 diesels take to the road



Chicago,ILL,UAA -Fleet Owner, by Jim Mele -Oct 19, 2009: -- Navistar rolled out three MaxxForce proprietary diesel engine families for a ride-and-drive event here, all using the company’s “advanced EGR” technology to meet the new 2010 federal emissions regulations. The engines – two medium-duty models and its “Big Bore” heavy-duty 11- and 13-liter – have finished durability and performance testing and will be submitted for certification by the U.S. Environmental Protection Agency starting in December, according to Ramin Younessi, Navistar Truck Group vp of product development&d strategy... Navistar will build 1,500 trucks with its new engines, including “a few 15-liter versions” before the end of the year and deliver them to customers in the first quarter of 2010, according to Jim Hebe, sr. vp -- North American Sales. The early builds will give users a chance to test Navistar’s singular approach to meeting 2010 emissions requirements... (Video from YouTube, by pentontrans - 19 Oct 2009: First Look:Navistar 2010 MaxxForce Big Bore 13-liter Heavy-Duty Diesel )

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Aug 26, 2009

SCR vs. EGR * Canada - Navistar OK with SCR engines ... in S. America

Warrenville,ILL,,USA -Today's Trucking (CAN) -25 Aug 2009: -- It may not believe in SCR technology as an emissions solution for North America, but Navistar is apparently going with the aftertreatment strategy on its engines in Brazil... Navistar International, of course, is the only major truck OEM to decline SCR in Canada and the U.S., continuing instead with "advanced" EGR. Though, according to the products page on its website, Navistar's MWM International Motores subsidiary is employing SCR in its NGD 9.3E medium-duty engine for the South American market... Spokesman Roy Wiley confirmed to todaystrucking.com that MWM would build SCR engines in Brazil. He said the engines are at the request of Volkswagen Truck and Bus, Navistar's largest South American customer, in meeting the Euro IV emissions standards Brazil has adopted... (Photo from ifsworld: International engines tcm)

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Aug 11, 2009

DANGEROUS SCR ? * USA - Engines May Emit Toxins

CARB Staffer’s Letter Warns

CAL,USA -Transport Topics, by Eric Miller -10 Aug 2009: -- The selective catalytic reduction process that most engine manufacturers will use to comply with 2010 federal diesel emission standards could emit toxic byproducts, the California Air Resources Board’s top researcher wrote in a recent letter filed in federal court by Navistar Inc.... Navistar, which is suing the U.S. Environmental Protection Agency in federal appeals court, filed the letter July 30 and said it bolsters the truck maker’s claim that EPA could be endangering public health by skipping the federal rule-making process in its approval of SCR... Written to “alert” a Boston nonprofit organization planning tests on 2010 engines, the letter said that SCR technology represents a “large departure from conventional emission controls by introducing a liquid additive containing an organic form of nitrogen”...
The June 12 letter, written by Bart Croes, chief of CARB research, to the Health Effects Institute, said that a comprehensive literature search showed that the “primary concern is the release of organonitrogen compounds, many of which are carcinogenic or toxic in other ways”... “Some toxic air contaminants that have been identified with SCR technology include hydrogen cyanide, cyanic acid, nitromethane, hydrazine, acrylonitrile, acrylamide, acetonitrile, and acetamide,” Croes wrote in his letter. “It is hoped that any exotic substances emitted from SCR technology will be at levels insignificant to exposure health effects”... “Although we are encouraged by findings to date, which suggest that the technology can deliver significant reductions of many species of toxicological relevance, this work has also documented the increase in some emissions such as some metals, nitrous oxide and nanoparticles,” CARB’s letter said... SCR systems reduce NOx in the aftertreatment by mixing the exhaust output with diesel exhaust fluid, a blend of pure urea and demineralized water, through a catalyst that converts NOx into harmless nitrogen and water vapor... Navistar, Warrenville, Ill., manufacturer of International trucks, is the only engine maker planning to use exhaust gas recirculation to meet EPA’s 2010 emission standard... The manufacturers using SCR include independent truck engine manufacturer Cummins Inc.; Daimler Trucks North America and its engine subsidiary, Detroit Diesel Corp.; Volvo Group America and Volvo subsidiary Mack Trucks... (Image from wikipedia: An aqueous ammonia SCR Process Overview; note that a vaporizer would not be necessary when using anhydrous ammonia)

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Jul 20, 2009

SCR vs. EGR * USA - 'At-the-Pump' DEF

Pilot announces diesel exhaust fluid (DEF) schedule, locations

Knoxville,TEN,USA -CSP -July 20, 2009: -- Pilot Travel Centers, the nation's largest retail operator of travel centers with more than 350 owned or licensed retail interstate locations in 41 states, has announced installation plans for the rollout of 100 diesel exhaust fluid (DEF) "at-the-pump" locations. The company was the first travel center chain to make the commitment to offer DEF at the pump, it said, and will carry prepackaged supplies of DEF at all 350 Pilot retail stores... Pilot's initial plans call for the installation of 100 bulk dispensing pumps at locations spread out nationally and at a rate of 25 pumps per quarter beginning in the third quarter of 2009 through the second quarter of 2010... Virtually all of the heavy-duty engines in volume production today, that will continue to be sold after the new standards take effect, will use SCR to comply with the new 2010 standards set by the U.S. Environmental Protection Agency (EPA). SCR technologies optimize engine function and, in turn, reduce fuel consumption and improve reliability and driveability for their owners...

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Jul 16, 2009

EGR vs. SCR * USA - Navistar presses legal fight against SCR

Warrensville,ILL,USA -eTrucker, by Avery Vise -15 July 2009: -- Navistar is turning up the heat in its ongoing litigation against the U.S. Environmental Protection Agency, charging the agency is trying to manipulate the record in the case to hide what Navistar calls EPA’s “secret collaboration” with truck and engine makers to advance selective catalytic reduction for 2010 emissions compliance... In its latest filing, Navistar argues EPA’s new index improperly removes many documents from the original index, “including documents likely to reveal EPA’s own conclusions effectively confirming the merits” of the lawsuit. Navistar says the documents removed reveal the “inefficacy and environmental hazard” posted by SCR, which EPA had called infeasible in 2001 “but later authorized in secret collaboration with certain engine makers outside of rulemaking”... Specifically, Navistar charges the driver inducements incorporated into the Feb. 18 guidance to encourage truck drivers to add diesel exhaust fluid (DEF) were drafted for EPA by the Engine Manufacturers Association... (Photo from trad.co.jp: EGR4)

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Jul 9, 2009

Pro SCR Survey * USA - Finds fleets leaning to SCR in '10

Greensboro,NC,USA -Today's Trucking (CAN) -7 July 2009: -- With six months to go before the new EPA 2010 emissions standards for heavy duty diesel engines go into effect, a survey commissioned by the coalition developing SCR (selective catalytic reduction) engines, concludes that, naturally, interest among carriers for their technology remains higher than increased EGR... Slightly more than half (51.2%) of respondents said they are "likely or very likely" to consider SCR for their EPA 2010 engine purchase compared to 31.2 percent that are likely or very likely to consider increased EGR -- the technology being employed only by Navistar International to meet 2010 rules.. (Images from whnet: SCR Kat E)

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Jun 13, 2009

EGR vs SCR * USA - Navistar tries to block rivals' role in EPA lawsuit

Navistar doesn't want its competitors butting into its court challenge of the EPA's decision to allow a rival technology for 2010 engines

Washington,DC,USA -Today's Trucking (CAN) -12 June 2009: -- ... In yet another petition filed with the federal Court of Appeals, Navistar -- which, as it's well known by now, is the only major truck OEM not using selective catalytic reduction (SCR) technology in upcoming 2010 engines -- is attempting to block pro-SCR truck makers from getting a say in the lawsuit against the Environmental Protection Agency... Not holding back any punches, the company also used the opportunity to further attack the EPA and SCR as a viable technology... Last week Cummins, Detroit Diesel, Volvo and Mack responded to the original suit against EPA by collectively filing what's known in legal jargon as a Amici Curiae (AC) motion (literally translated to "friends of the court")... Navistar, not surprisingly, is asking the court to reject the AC. It predicts that its competitors will "not offer a unique and important perspective” and will only echo the briefings EPA already filed with the court. The company also brushed off SCR manufacturers' position that they have “expended significant resources" to develop the technology, since most of the truckmakers had been using similar SCR solutions in Europe... In particular, Navistar contends that by changing course, EPA improperly allowed SCR systems to incorporate a 'ramped shutdown' feature in case DEF tanks run dry. Navistar likens this allowance to a "licence to pollute" and "pollution for convenience."... (Photo: The MaxxForce15, the only non-SCR big bore to hit the market in '10, is based on a Cat C-15 platform)

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Apr 9, 2009

EGR vs SCR * EUROPE

* Germany - MAN's Euro-5 line-up. It's mainly EGR with a bit of SCR too

Munich,Germany -BigLorryBlog (UK) -April 8, 2009: -- ... However, the argument over EGR vs SCR is frankly starting to lose any significance--especially as it's generally accepted that for Euro-6 (expected around 2012 and 2013) you'll need both technologies... Although as one MAN insider told BLB last week when the conversation turned to Euro-6: "It's not about how much EGR you'll need with SCR---it's about how much SCR you'll need with EGR!" Nice footwork guys...Of course the real issue with EGR has been cooling---and at higher horsepower ratings its struggled to keep pace as emission levels have got tighter. Although it's interesting to note that Scania has managed to do it with its Euro-5 480hp 13-litre, even if we haven't seen EGR on the Swede's big vee engine. I wonder if we'll ever see that doing without AdBlue?...

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Mar 24, 2009

EGR vs. SCR DEBATE * USA - Heats up at Mid-America Trucking Show

“This may be the only time you see the world’s three largest producers of heavy-duty diesel engines in violent agreement about anything”

Louisville,KY,USA -Truck News (CAN), by James Menzies -19 March 2009: -- It was a rare sight: the CEOs of four major engine manufacturers sitting side-by-side on a panel and nodding in agreement as each of the others spoke. The scene was the SCR for 2010 - CEO Summit, hosted by FactsAboutSCR.com at the Mid-America Trucking Show... Included on the panel were: Chris Patterson, CEO of Daimler Trucks North America; Per Carlsson, CEO of Volvo Trucks North America;; Denny Slagle, CEO of Mack Trucks; and Jim Kelly, president of the engine business for Cummins. They were there to extol the virtues of selective catalytic reduction (SCR), the technology each of their respective companies will employ to meet EPA2010 emissions standards... “It strikes me as I sit here that even though we represent a very significant percentage of the world’s heavy-duty engine and truck production, we must not be very good leaders,” chided Volvo’s Carlsson. “And the thousands of engineers working for us around the globe must not be very bright, because we’ve selected SCR for EPA2010. And according to the sole adopter of massive EGR, we’ve all made the wrong choice.”... Daimler Trucks North America’s Patterson pointed out “This may be the only time you see the world’s three largest producers of heavy-duty diesel engines in violent agreement about anything.”... He suggested focusing on the benefits of SCR, including fuel economy improvements of about 5%. (Each of the engine OEMs represented cited similar fuel economy gains will be achieved with their versions of SCR)...

* ... And Navistar ? ...

Louisville,KY,USA -Truck News (CAN), by James Menzies -19 March 2009: -- Navistar's Tim Shick, director of marketing with Navistar’s engine group response, said Navistar is more confident than ever that it has made the right choice by carving its own path... Navistar will use emissions credits to slowly work its way down to the EPA2010 NOx limit of 0.2 g/bhp-hr, beginning at a level of 0.5 grams on Jan. 1, 2010. When asked for an explanation on how Navistar will meet the 0.2 g NOx limit once its emissions credits run out (expected to occur sometime in 2012), Shick said “If you put enough exhaust gas back into an engine, you can reach just about any level of NOx you want – that’s not the challenge.”... He continued: “The challenge at that level is to retain good performance, fuel economy and durability. And the way we ensure that is, every time we take the EGR rate up in the series of steps we’re making to the final 0.2 g emissions engine, we also take the fuel pressure up. We recalibrate to make sure that all those ingredients in the mix are optimized, and so far we’ve seen in the lab and we have trucks on the road today that show it definitely can be done, we are doing it and we will bring it out…the key to it is that high pressure common rail fuel system, that’s the magic ingredient.”...


* Navistar comes out swinging about "truly nutty" SCR alternative - International’s decision to stick with EGR rather than switch to SCR technology as forward thinking

Louisville,KY,USA -Truck News (CAN), by Lou Smyrlis -19 March 2009: -- Speaking before customers, dealers and the media at an exclusive night event at the Mid America Trucking Show, Navistar, not only defended its decision to be the only truck maker staying the course in meeting the 2010 emissions with EGR technology, it came out swinging... Dee Kapur, president, Navistar Truck Group, has been a vocal critic of SCR and he didn’t hold back, calling it “the truly nutty” alternative that asks truck buyers to deal with the “toxic agent” of urea... Jack Allen, president of Navistar’s North American Truck Group, said advanced EGR makes it easier for customers, and engine designs exceeded government standards, as the better way to go... Allen also questioned the environmental and operational impact of having to use urea with the SCR alternative. He said urea is going to prove expensive, using a figure of $35 a gallon... He added that availability of urea may also be a problem, arguing that even if 500 locations initially offer urea across the US, that’s a small portion of the 35,000 diesel locations across the US... Allen characterized International’s decision to stick with EGR rather than switch to SCR technology as forward thinking... (See Animated image about)


* Volvo says 'so long' to active DPF re-gens

Louisville,KY,USA -Truck News (CAN) -19 March 2009: -- Volvo Trucks North America announced today that it will no longer require active diesel particulate filter (DPF) regenerations on its 2010 engines with selective catalytic reduction (SCR)... In extensive field testing, engineers have noted highway trucks with Volvo’s 2010 engines and SCR have been able to regenerate passively 100% of the time. That’s significant, because active regenerations require a dose of diesel fuel... Ed Saxman, drivetrain product manager with Volvo Trucks North America, said the ability to regenerate the DPF passively each and every time is another compelling reason to embrace SCR in 2010...


* ENDINGLY: Denny Slagle, CEO of Mack Trucks urged everyone to do their due diligence when selecting an engine technology for 2010... (P.N. ... and we agree with !!!)

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