FREIGHTLINER TO USE SCR FOR 2010
United States, said Chris Patterson, president and CEO of Freightliner Trucks.
The SCR usage would be only for “our self-manufactured engines, marketed today as Detroit Diesel and Mercedes-Benz,” Patterson said, referring to engines made by Detroit Diesel and its sister brand Mercedes-Benz.
Competing heavy-truck engine makers have said they plan to use existing technology – exhaust gas recirculation or, in the case of Caterpillar, its proprietary ACERT technology – to meet standards in 2007, though they have not indicated firm plans for 2010 standards. Detroit and Mercedes heavy-duty engines now use EGR.
The Freightliner plans were mentioned by Andreas Renschler, head of DaimlerChrysler’s Commercial Vehicle Division, during a meeting in Germany. DaimlerChrysler owns Freightliner and its Detroit Diesel subsidiary.
“DaimlerChrysler sees selective catalytic reduction, using urea as a post-combustion catalyzing agent, as the optimal technical solution to the challenge of meeting the Environmental Protection Agency’s announced restrictions on NOx and particulate matter for 2010 and beyond,” Patterson says.
“We are working with other engine producers, and with fueling infrastructure owners, to assure the agency that this approach meets both the letter and the intent of the regulation.”
Urea is a crystalline solid found naturally in human urine but also synthetically produced for industrial purposes, for example the making of plastics and fertilizer.
SCR pumps urea into the exhaust stream, reducing the NOx back into nitrogen and oxygen.
The system has a urea tank on the truck that must occasionally be refilled by the driver.
Engine makers have shied away from SCR in part because of the requirements of creating a sufficient nationwide distribution of urea.
Cummins will announce its decision on emissions technology for 2010 during the second half of 2006, says company spokeswoman Cyndi Nigh.
“SCR is a viable solution for 2010 when it is combined with cooled engine gas recirculation,” Nigh says.
Volvo is using EGR and SCR in Europe, says Peter Karlsten, Volvo president and CEO. SCR seems like the best choice for 2010, he says, “but we haven’t made up our minds yet.”
Mack spokesman John Walsh says, “SCR is certainly one of the technologies we’re strongly considering for 2010.”