This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Air Injection to an Electrically-Heated Catalyst for Reducing Cold-Start Benzene Emissions from Gasoline Vehicles
Annotation ability available
Sector:
Language:
English
Abstract
This paper describes the laboratory effort to determine the emissions benefit of cold-start air injection to a preheated automotive catalyst. Previous experimentation with an electrically-heated catalyst on a gasoline-fueled vehicle with no supplemental air showed little improvement in hydrocarbon emission control.
In this study, air was injected ahead of an electrically-heated catalyst during cold-start operation. Analysis of continuously recorded raw exhaust emissions were used to determine air injection calibrations and oxidation-reduction trade-offs. Improved control of non-methane hydrocarbons (NMHC), benzene, and carbon monoxide (CO) emissions was observed. Nitrogen oxides (NOx) emission control was maintained by the use of a carefully controlled air injection flow-rate and schedule.
This study determined that heating an auto-motive exhaust emission catalyst prior to cold-start operation may not be sufficient in itself. Supplemental oxygen may be required for improved emissions control. Finally, it was demonstrated that the gasoline vehicle used in this study, equipped with an electrically-heated catalyst and air injection, provided FTP emission rates of non-methane organic gases (NMOG), CO, and NOx near or at the California standards for the ultra-low emission vehicle (ULEV).
Recommended Content
Authors
Topic
Citation
Heimrich, M., "Air Injection to an Electrically-Heated Catalyst for Reducing Cold-Start Benzene Emissions from Gasoline Vehicles," SAE Technical Paper 902115, 1990, https://doi.org/10.4271/902115.Also In
New Directions and Developments in Automotive Emission Control
Number: SP-0839; Published: 1990-10-01
Number: SP-0839; Published: 1990-10-01
References
- Code of Federal Regulations
- Blair, D. M. Piotrowski, G. K. “Evaluation of a Resistively Heated Metal Monolith Catalytic Converter on an M100 Neat Methanol-Fueled Vehicle,” August 1988
- Piotrowski, G.K “A Resistively Heated Catalytic Converter with Air Injection for Oxidation of Carbon Monoxide and Hydrocarbons at Reduced Ambient Temperatures,” September 1989
- Hellman, K. H. Bruetsch, R. I. Piotrowski, G. K. Tallent, W. D. “Resistive Materials Applied to Quick Light-Off Catalysts,” SAE Paper 890799 February 27 March 3 1989
- Piotrowski, G. K. “Evaluation of a Resistively Heated Metal Monolith Catalytic Converter on a Gasoline-Fueled Vehicle,” December 1989
- Heimrich, M. J. “Experimentation to Determine the Feasibility of Air Injection on an Electrically-Heated Catalyst for Reducing Cold-Start Benzene Emissions from Gasoline Vehicles,” Final Report prepared for the Advisory Committee for Research South-west Research Institute January 1990
- Current Southwest Research Institute program “Control of Benzene Emissions from Light-Duty Motor Vehicles,” Department of Emissions Research for the California Air Resources Board 1987-1990
- “A Proposal to Amend Regulations Regarding Exhaust Emission Standards and Test Procedures for Passenger Cars, Light-Duty Trucks, and Medium-Duty Vehicles for the Control of Criteria Pollutant and Toxic Air Contaminant Emissions,” State of California Air Resources Board, Mobile Source Division Draft April 23 1990
- Whittenberger, W. A. Kubsh, J. E. “Recent Developments in Electrically Heated Metal Monoliths,” SAE Paper 900503 February 26 March 2 1990
- Dietzmann, H. E_ et al. “Analytical Procedures for Characterizing Unregulated Pollutant Emissions from Motor Vehicles,” February 1979