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Vapor Canister Heater for Evaporative Emissions Systems
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English
Abstract
Automotive evaporative emissions systems use a charcoal canister to store evaporative hydrocarbon emissions. These stored vapors are later purged and burned during engine operation. Under certain conditions the engine cannot completely purge the canister of the stored fuel vapors, which results in a decreased vapor storage capacity in the canister. A self-regulating PTC (Positive Temperature Coefficient) heater has been developed to warm the purge air as it enters the canister, in order to provide thermal energy for increased release of the vapors from charcoal sites. This paper describes the construction and operation of the vapor canister heater as it relates to improved evaporative emission system performance.
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Authors
Citation
Bishop, R. and Berg, P., "Vapor Canister Heater for Evaporative Emissions Systems," SAE Technical Paper 870123, 1987, https://doi.org/10.4271/870123.Also In
SAE 1987 Transactions Alternative Engines and Engine Components and Systems
Number: V96-5; Published: 1988-09-01
Number: V96-5; Published: 1988-09-01
References
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- “Evaporative-Emissions Rules Eyed” Automotive News September 10 1984 23
- “Activated Carbon for Effective Control of Evaporative Losses” Joyce Ronald S. Langston Paul D. Stoneburner George R. Stunkarol Charles B. Tobias George S. Pittsburgh Activated Carbon Division, Calgon Corp. SAE Paper # 690086 January 1969
- “Control Characteristics of Carbon Beds for Gasoline Vapor Emissions” EPA-600/2-77-057 Manos Michael J. Kelly Warren C. Scott Environmental Technology, Inc. February 1977
- “PTC Ceramic Heaters in Automotive Controls” Paganelli Jude V. Texas Instruments Incorporated Attleboro, MA SAE Technical Paper # 840143 February 27 March 2 1984
- “Cold Weather Diesel Fuel Preparation with PTC Heaters” Berg Peter G. Texas Instruments Incorporated Attleboro, MA SAE Technical Paper # 840539 February 27 March 2 1984
- “PTC Honeycomb Heater for Improved Fuel Vaporization” Berg Peter G. Texas Instruments Incorporated Attleboro, MA SAE Technical Paper # 810156 February 23 27 1981
- “The Electric Choke for Improved Cold Start Control” Berg Peter G. Texas Instruments Incorporated Attleboro, MA SAE Technical Paper # 820390 February 22 26 1982
- “Vapor Canister Heater Vehicle Testing” Bishop R. Texas Instruments Incorporated Attleboro, MA August 1986