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Fuel Effects on Emissions from Two Electrically Heated Catalyst Equipped Vehicles
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English
Abstract
The effect of gasoline composition on the exhaust emissions from two vehicles equipped with electrically heated catalysts (EHC) and secondary air injection was studied. The two vehicles used were a 1991 Ford Tempo and a 1992 Chevrolet Lumina. One novel feature of the EHC system was automatic feedback control of secondary air injection using a heated oxygen sensor. This control scheme provided sufficient air for significant decreases in hydrocarbons (HC) and CO without an increase in NOx. Exhaust emissions were measured for each vehicle, both with and without an EHC for three fuels: Indolene certification fuel, a high emissions fuel (high aromatics/T90), and a low emissions fuel (low aromatics/T90).
The average total hydrocarbon (THC) reduction in both EHC equipped vehicles tested on three different fuels was 52%, with a high of 62% and a low of 36%. NOx was not adversely affected by secondary air injection for all fuels tested because of the feedback control scheme used. Fuel composition effects on hydrocarbon emissions during the cold start portion of the FTP were substantially reduced in the EHC equipped vehicles compared to the base vehicles.
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Citation
Lucchesi, R., "Fuel Effects on Emissions from Two Electrically Heated Catalyst Equipped Vehicles," SAE Technical Paper 932760, 1993, https://doi.org/10.4271/932760.Also In
References
- Summers J. C. et al “Use of Light-Off Catalysts to Meet the California LEV/ULEV Standards” SAE Paper No. 930386 March 1993
- Hochmuth J. K. et al “Hydrocarbon Traps for Controlling Cold Start Emissions” SAE Paper No. 930739 March 1993
- Hochhauser A. M. et al “The Effect of Aromatics, MTBE, Olefins and T90 on Mass Exhaust Emissions from Current and Older Vehicles - The Auto/Oil Air Quality Improvement Research Program” SAE Paper No. 912322 October 1991
- A M O T
- Heimrich M. J. “Air Injection to an Electrically-Heated Catalyst for Reducing Cold-Start Benzene Emissions from Gasoline Vehicles” SAE Paper No. 902115 October 1990
- Socha, L. S. Jr. Thompson D. F. “Electrically Heated Extruded Metal Converters for Low Emission Vehicles” SAE Paper No. 920093 February 1992
- Weber P. A. et al “Fuel Effects on Emissions from an Advanced Technology Vehicle” SAE Paper No. 922245 October 1992