The emission control limits for gasoline- and diesel-based powertrains are observed to considerably converge in terms of design and emissions control requirements. Gasoline DI engines almost equate with diesel engines in particulate emissions and required aftertreatment. GPFs are indispensable for about half of all gasoline engines sold in the European Union. The integration of the GPF and TWC into a four-way catalyst is expected to become a new trend in gasoline powertrains. DPFs will also be an integral part of the latest NOx reduction systems. NOx storage catalysts will play an important role in improving efficiencies of SCR systems, especially in cold temperature conditions and low-speed operation. In some systems, ammonia delivery systems will be used to allow for dosing at lower temperatures to take care of NOx emissions after cold start and avoid fuel consumption penalties associated with catalyst heating modes. Future emission standards will force major automotive markets to adopt the latest forms of powertrain architectures for compliance. OEMs and suppliers will be on the lookout for further innovations under emission reduction, powertrain electrification, and lightweighting. Diesel vehicles will have reduced preference, limited to large SUVs and trucks. Investments will be largely targeted at developing electrified versions of gasoline powertrains, while OEMs and suppliers continue to research on more pragmatic and sustainable powertrain solutions.
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