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Mathematical Simulation of Automotive Fuel Systems
ISSN: 0148-7191, e-ISSN: 2688-3627
Published February 01, 1968 by SAE International in United States
Annotation ability available
Event: Mid-Year Meeting
A mathematical model of the fuel system of an automotive engine has been constructed, utilizing the basic engineering principles of fluid flow, heat and material balances, and the vapor-liquid equilibria characteristics of the fuel components. This model, when implemented on a digital computer, can be used to study such aspects of the steady state and dynamic behavior of an automotive fuel system as vapor locking tendencies, carburetor icing, hydrocarbon evaporative emissions, and with modifications, cold starting, warmup, hot starting, hot idle, and so forth.
Mathematical models of this type, by defining the parameters to be evaluated using selected experimental programs, permit the rapid accumulation of more useful and realistic information than can be obtained by an empirical approach. Two versions of this type of model have been implemented.
PART 1: VAPOR LOCK MODELS - The first model deals with the volatility behavior of gasoline, defined by trueboiling-point analysis. The model is used with specified automotive engine and operating conditions. The vapor locking tendency under any given steady state or dynamic condition (for example, acceleration) may be determined. The computer program output includes time graphs of car speed and fuel content of the carburetor.
PART 2 - CARBURETOR ICING MODEL - A dynamic mathematical model of carburetor icing in automotive fuel systems (DYNIM) has been developed and programmed for a digital computer. It defines the relationships among gasoline composition, operating conditions, ambient conditions, car characteristics, and tendency for forming ice in the carburetor. The model can also be used to study the effect of additives used as anti-icing agents. Although the conventional icing test sequence of acceleration, steady state, deceleration, and idle is employed in the model as described, any desired sequence may be specified.
CitationKlecka, M. and Oubre, C., "Mathematical Simulation of Automotive Fuel Systems," SAE Technical Paper 680436, 1968, https://doi.org/10.4271/680436.
- EggertsenF. T.GronningsSigurdHoistJ. J.Jr., Anal. Chem., Vol. 32 No. 8 (1960), p. 904.
- OubreC. L.KleckaM. E. “Mathematical Simulation of Automotive Fuel Systems, Part 2: Carburetor Icing Model.” Paper 680436 presented at SAE Mid-Year Meeting, Detroit, May 1968.
- NelsonW. L. “Petroleum Refinery Engineering.” New York: McGraw-Hill, (1958) p. 204.
- Coordinating Research Council, Summary of Basic Data: 1964 CRC Vapor Lock Tests, 1964.
- Coordinating Research Council, Summary of Basic Data: 1966 CRC Vapor Lock Tests, 1966.
- WadeD. T. “Factors Influencing Vehicle Evaporative Emissions,” SAE Transactions, Vol. 76 (1968), paper 670126.
- EbersoleG. D.McReynoldsL. A. “An Evaluation of Automobile Total Hydrocarbon Emissions.” SAE Transactions, Vol. 75, Sec 2 (1967), pp. 731-746.
- UnzelmanG. H.ForsterE.J. Petroleum Refiner, Vol. 39 (1960), p. 109.
- KleckaM. E.OubreC. L. “Mathematical Simulation of an Automotive Fuel System, Part I: Vapor Lock Models.” Paper 680436 presented at SAE Mid-Year Meeting, Detroit, May 1968.
- DemuthT. P.JacksonH. R.TestL. J. “Carburetor Icing Tests in the Laboratory and in Service.” Paper 448C presented at SAE Automotive Engineering Congress, Detroit, January 1962.
- DuganW. P.ToulminH. A. “Carburetor Icing Tendencies of Some Present Day Fuels and Engines.” SAE Transactions, Vol. 63 (1955), pp. 442-450.
- DuganW. P.ToulminH. A. “Ice Can Clog Carburetors - Even in Warm Weather.” SAE Journal, Vol. 63 (March 1955), pp. 39-42.
- DuntonG. R.IIISchueleH. J.RogersJ. D.Jr., “Variables Affecting Carburetor Icing in Controlled Laboratory Tests.” SAE Transactions, Vol. 71 (1963), pp. 651-662.
- EltingeLamontGrayD. S.KayR. E.OhladS. R., “Gasolines, Cars, and Carburetor Icing.” SAE Journal, Vol. 70 (April 1962), p. 78.
- FreemanJ. H.Jr., “A Test Method for Rating the Throttle Icing Tendencies of Gasolines.” Paper presented at the SAE National Fuels and Lubricants Meeting, Tulsa, Okla., November 2-4, 1960.
- KuncJ. F.HaworthJ. P.HickokJ. E. “Additives Eliminate Auto Carburetor Icing.” SAE Journal, Vol. 59 (August 1951), pp. 45-47.
- KuncJ. F.HaworthJ. P.HickokJ. E. “A New Look at Motor Gasoline Quality - Carburetor Icing Tendency.” Paper presented at the SAE Annual Meeting, Detroit, January 8-12, 1951.
- ObertE. F. “Internal Combustion Engines - Analysis and Practice.” Scranton, Pa.: International Textbook Co., 1950.
- RobinsonJ. E.FoulkJ. F.TupaR. C. “Carburetor Icing - A Problem?” Paper presented at the SAE Annual Meeting, Detroit, January 8-12, 1962, paper 448-B.
- RosenlundI. T., “Carburetor Icing Demonstrator.” Paper 244 presented at the SAE National Transportation Meeting, Cleveland, November, 1957.
- SchueleH. J.BurtJ. G. “New Tests on Carburetor Icing.” Petroleum Refiner, Vol. 39 No. 11 (1960), pp. 255-260.
- UnzelmanG. H.ForsterE. J. “How to Blend for Volatility,” Petroleum Refiner, Vol. 39 No. 10 (1960), pp. 122-123.