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Electrically Heated Catalyst - Design and Operation Requirements
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English
Abstract
EHC design and engine operation requirements for a battery powered EHC-cascade were investigated using flow rig, engine dynamometer and vehicle evaluations.
Low mass and Pd-coated heater elements and light-off converters are recommended for optimum light-off performance. Raising the heating power improves light-off. However, battery powered systems are limited to 1.5 kW.
Rich engine operation combined with an excess of secondary air results in high exothermic energy output. The benefit of additional heating and the impact of cascade position (close coupled or underfloor) are closely related to the test cycle.
ULEV limits were achieved using a MY 91 vehicle without upgrades in engine control.
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Citation
Terres, F., Weltens, H., and Froese, D., "Electrically Heated Catalyst - Design and Operation Requirements," SAE Technical Paper 961137, 1996, https://doi.org/10.4271/961137.Also In
References
- Kollmann, K. et al. “Concepts for Ultra Low Emission Vehicles” SAE Paper 940469
- Ma, T. et al. “Exhaust Gas Ignition (EGI) - A New Concept for Rapid Light-Off of Automotive Exhaust Catalys” SAE Paper 920400
- Breuer, J. et al. “Electrically Heated Catalyst for Future USA and European Legislation” SAE Paper 960339
- Socha, Louis S. et al. “Emissions Performance of Extruded Electrically Heated Catalysts in Several Vehicle Applications” SAE Paper 950405
- Kaiser, F.W. et al. “Optimization of an Electrically-Heated Catalytic Converter System Calculations and Application” SAE Paper 940465
- Pfalzgraf, B. et al. “The System Development of Electrically Heated Catalyst (EHC) for the LEV and EU-III Legislation SAE Paper 951072
- Shimasaki, Yuichi et al. “Study on Conformity Technology with ULEV Using EHC System” SAE Paper 960342
- Abe, F. et al. “An Extruded Electrically Heated Catalyst: From Design Concept through Proven-Durability” SAE Paper 960340