"SCR requires no modification to cooling systems. It also provides higher power density, so we're able to provide power in a higher range at the same displacement that we enjoy today.
"And we're experiencing the ability to avoid multiple EGR coolers and valves, as well as (being able to) simplify turbo machinery.
"I do want to address one item that has come up with me, personally. There's been much discussion about some company's choice to use Cooled EGR to meet the EURO V requirements, and the perception that EURO V and EPA 2010 are close. EURO V is a long way from EPA 2010 as relates to NOx, and there's an emerging consensus that EURO VI will be met with Cooled EGR and SCR as well.
"So, we're confident in our 2010 solution, and that includes SCR. We also understand that in order to make an SCR system work we have to have DEF available... We believe that infrastructure is well underway, and will be more than capable of meeting the industry's needs."
International MaxxForce Advanced EGR
Navistar, manufacturers of MaxxForce medium- and heavy-duty diesel engines for International trucks, has also issued its own public comments on the merits of its "Advanced EGR" emissions system for 2010. The company has, in recent months, introduced its MaxxForce 13-liter engine at the World of Concrete Show in Las Vegas, its medium-duty MaxxForce DT engine at the National Truck Equipment Association Work Truck Show in Chicago, and it's top-of-the-line MaxxForce 15-liter engine at the Mid-American Trucking Show in Louisville, KY. The following is a compendium of some of the comments from Navistar from all three events:
"Our strategy of 2010 emissions compliance through the use of an EGR-only solution is on track," said Steve Guillaume, Navistar general manager, vocational trucks. "With our line-up of MaxxForce Advanced EGR engines, we're delivering a simple and straightforward solution that places the burden of emissions compliance on the manufacturer, not the consumer."
To meet the U.S. Environmental Protection Agency (EPA) 2010 emissions requirements for on-highway diesel engines, MaxxForce Advanced EGR engines will use proven technologies such as advanced fuel injection, air management, electronic controls and proprietary combustion technology.
"We've been conducting rigorous testing and analysis in our engine labs and currently have 2010 prototype engines installed in medium- and heavy-duty test trucks," said Ramin Younessi, group vice president, truck and engine product development. "These test vehicles are on the road in real-world conditions and will log millions of miles of real-world experience before the launch of these engines."
Other major truck and engine manufacturers are choosing a 2010 emissions path through Selective Catalytic Reduction (SCR), which requires the use of an additional operating fluid, called urea, as well as significant aftertreatment equipment that will add hundreds of pounds to each vehicle.
Navistar's EGR approach will not require the use of urea or the addition of heavy on-vehicle urea storage tanks, converters, heaters, and the additional electronics required by SCR systems. MaxxForce Advanced EGR engines set Navistar apart from the competition with a no-hassle, business as usual solution for the customer by delivering lower operating costs.
"Many of the OEMs adopting the SCR strategy point to the success in meeting Europe's emissions standards, which are not as stringent as the U.S.," added Younessi. "However, at least two European engine manufacturers are moving toward a non-SCR solution to meet Europe's next emissions hurdle. That should raise some doubts about the long-term viability of SCR."
For SCR systems in the U.S., the EPA will require a series of driver compliance controls, including a complex array of warning lights as well as a disabling system which will automatically power down the engine when urea levels run low.
"We strongly believe the accountability for emissions compliance should rest on the manufacturer, not on the actions of the driver, the reliability of very complex technologies or the impact of climatic conditions," added Guillaume. "The development and testing of our EGR solution for 2010 is in advanced stages and we are confident that our engines will deliver the performance, reliability and low operating costs our customers demand."
Guillaume added in his comments at the Work Truck Show that that adoption of SCR engine technologies would be hampered by what he described as an "underdeveloped urea infrastructure" and suggested that urea is "very volatile." His colleague, Jim Hebe, Navistar senior vice president, North American sales operation, softened the rhetoric a bit in his comments at a private function at the Mid-American Trucking Show, saying that urea is "possibly volatile."