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Improved Design of Onboard Control of Refueling Emissions
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English
Abstract
Onboard refueling control technology has been successfully applied to two vehicles with 98+% efficiency in tests with 10.5 RVP fuel at 84° F. The Onboard system, which controls exhaust, evaporative, refueling, and so called “running losses”, was constructed out of components found in current automotive evaporative control systems. During refueling, the tank vapors are forced into the enhanced charcoal canister by a flowing liquid seal in the fillpipe. The canister was removed from the engine compartment and mounted within the vehicle frame close to the fuel tank. Each vehicle demonstrates a different possible safe location from a crash worthiness viewpoint. In order to further improve safety by preventing the expulsion of liquid gasoline upon gas cap removal, the orifices in the production tank vent lines were removed so that the fuel tank is at atmospheric pressure at all times. As modified, no significant driveability differences from production vehicles were found. Both the production and onboard vehicles met current exhaust and evaporative standards. In addition, results of laboratory simulated rollover tests showed zero fuel spillage.
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Authors
Citation
Musser, G., Shannon, H., and Hochhauser, A., "Improved Design of Onboard Control of Refueling Emissions," SAE Technical Paper 900155, 1990, https://doi.org/10.4271/900155.Also In
References
- “Onboard Control of Vehicle Refueling Emissions, Demonstration of Feasibility” API Report No. 4306 October 1978
- Musser George S. Shannon Hugh F. “Onboard Control of Refueling Emissions” SAE Paper 861560
- Koehl W. J. Lloyd D. W. McCabe L. J. “Vehicle Onboard Control of Refueling Emissions--System Demonstration on a 1985 Vehicle” SAE Paper 861551
- Hochhauser A. M. Campion R. J. “An Experimental Study of Vehicle Refueling Emissions” SAE Paper 760307
- “A Study of Variables that Effect the Amount of Vapor Emitted During the Refueling of Automobiles” API Report No. CEA-21 May 1975
- EPA NPRM on Refueling Emission Regulations Federal Register August 19 1987 31162 31271
- EPA Workshop on “Modifications to Evaporative and Refueling Test Procedures for the Control of Excess Evaporative Emissions” June 30 1988 Ann Arbor, Michigan
- “Survey of Evaporative Emission Systems Condition on In-Use, High Mileage Automobiles” API Report No. 4393 February 1985