Continental will be presenting solutions to support even more efficient exhaust after-treatment in trucks at the upcoming 67th International Commercial Vehicle Show (IAA) in Hanover, Germany next month.
The primary aim is to ensure more efficient conversion of the nitrogen oxides (NOx) into harmless emissions, whether on heavy-duty long-haul trucks, urban light trucks or municipal vehicles. The challenge centers on ensuring that the exhaust aftertreatment system reaches – and maintains – an efficient working temperature as quickly as possible after starting the engine.
However, the possibilities for integrating catalysts and filters differ greatly from vehicle to vehicle. Not all models offer scope for close-coupled mounting of the catalyst and filter. On some models such a configuration may be out of question for many years to come, due to the long design cycles of heavy-duty truck frames.
Continental has therefore developed solutions that make it possible to achieve further improvements in NOx conversion efficiency whichever of these two situations applies. At the IAA in Hanover, the company will present both types of solution – close-coupled systems and, alternatively, an architecture based on an innovative combination of diesel injection into the exhaust stream and an electric heating element mounted upstream of the catalyst.
“In the future, ensuring real-world compliance with new standards will require a vast improvement in the NOx performance of both long-haul and urban commercial vehicles,” says Dr. Markus Distelhoff, Executive Vice President Fuel & Exhaust Management Business Unit, Powertrain Division. “The exhaust aftertreatment solutions we are presenting in Hanover for these two different basic architectures contribute both to improved fuel efficiency and reduced NOx emissions.”
In passenger cars, the catalytic converter is often mounted very close to the engine, ensuring that the interior of the catalytic converter reaches the necessary operating temperature as quickly as possible. The same approach is not always possible in a truck due to lack of space.
Continental offers two solutions to this problem. Use of a new ‘concertina-type folding technique’ in the catalyst makes it easier to implement asymmetrical catalyst dimensions that are more closely adapted to the available packaging space.
“With the new folding technique, it is possible to maximize the scope for OEMs to accommodate a close-coupled DOC in heavy-duty trucks,” says Dr. Manuel Presti, Program Manager Fuel & Exhaust Management Business Unit. At the same time the slanted metallic CS substrate (CS: crossversal structure), which is able to dispense with a flat intermediate layer, also allows the mass of the system to be reduced by approximately 20%.