The second way is the use of EGR plus a special "a bsorber " catalyst material to soak up and break down remaining NOx molecules before they leave the tailpipe.
Navistar is the only diesel engine manufacturer that says it will use in-cylinder EGR only to reduce NOx next year, but it will be limited to large over-the-road truck applications and not HD pickups and chassis cabs. EGR is prevalent in today 's clean diesel engines to reduce NOx, but itâ?s not efficient enough in current form to meet 2010 emissions levels. The cooled gases have a higher heat capacity and contain less oxygen than air, lowering combustion temperatures and reducing the formation of NOx. EGR recirculates a portion of the engine's exhaust back into the engine at a lower temperature. There are three ways to lower NOx emissions in diesels: The first is exhaust gas recirculation. At 15 parts per million, ULSD contains 97 percent less sulfur than the 500 ppm low sulfur diesel it replaced.
The so-called Tier 2 Bin 5 regulations also mandated the use of diesel particulate filters and ultra-low-sulfur diesel fuel to cut soot emissions by 90 percent in 2007 from 2006 levels. This is unlike a gas engine, which uses spark ignition to burn petrol.Ĭome 2010, all new diesel-powered pickups will have to meet tougher federal diesel emission standards that will reduce allowable nitrogen oxide levels by 90 percent from today and by 96 percent from 1994. It's a byproduct of diesel 's high combustion temperatures, which results from the high frictional heat levels created by compressing air in the cylinders to the point where it can ignite diesel fuel without using a spark. NOx is a major air pollutant that contributes to smog, asthma, and respiratory and heart diseases. It turns out that urea, which is being sold under the more marketable name "diesel exhaust fluid ",is also a chemically efficient way to reduce nitrogen oxide emissions produced by diesel engines. Urea is the same organic compound found in urine, which has forced drivers (at least most drivers) to pause for bio-breaks ever since the car was invented. Soon, many will have to think about making pitstops for another fluid: urea. They crave diesel 's high torque at low rpms and extended driving range between fill-ups. I t's been said that heavy-duty pickup truck owners who haul and tow frequently have diesel running through their veins.
Pickups though the Ram 3500, 45 cab chassis trucks will use urea The new 2010-2011-2012 Ram Heavy Duty 2500Īnd 3500 pickup trucks carry over the same urea-free NOx reduction system that
0 kommentar(er)
