Lowest Real Driving Emissions: Solutions for Electrified Gasoline Engines

Authors

Rolf Brück, Holger Stock, Continental Emitec GmbH, Lohmar;
Dr. Gerd Rösel, Dr. Erwin Achleitner, Friedrich Graf, Paul Rodatz, Peter Senft, CPT Group GmbH, Regensburg

Summary

The future worldwide reduction of gaseous emissions, particulates and fuel consumption requires the electrification of the powertrain, especially for Real Driving Emission (RDE) legislation. Optimum interaction of 48 V high-power hybrid with the combustion engine are the key technology to reduce CO₂ emissions.

The main sources of pollutants are cold start and highly dynamic engine operation. Therefore, an optimized injection system for 350 bar with optional extension to 500 bar fuel pressure and 48 V electrification are the measures to reduce engine out emissions. This updated injection system will be the furthermore enabler to reduce CO₂ by knock resistance at high compression ratio engines at low particulate number raw emission.

For a highly efficient pollutant reduction, the full operation of the aftertreatment system after start of internal combustion engine is required. The electrically heated catalyst with an active purge pump will bring aftertreatment to light off even if combustion engine
will not be active. The combination of HC trap and electrically heated catalyst has been presented as an option to further reduce hydrocarbon emissions. The active purge pump enables additionally a stoichiometric or lean mixture in the catalytic converter at low temperatures when the combustion engine operated with rich air/fuel ratio or during desorption of the HC trap and during gasoline particle filter regeneration.

On the road to unlimited clean mobility the presented technologies applied in a system approach allow the full operation of  aftertreatment system close to cold start to deal with RDE short travel distances.

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