This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Transient A/F Control Characteristics of the 5 Liter Central Fuel Injection Engine
Annotation ability available
Sector:
Language:
English
Abstract
Experiments have been conducted to determine the nature and causes of A/F transients during changes in throttle angle on a 5 Liter central fuel injected dynamometer engine. Tests consisted of a series of one-second throttle ramps of various magnitudes at constant engine speed. Fuel metering calculation was adjusted to give error free metering, so that observed A/F transients were due to induction system characteristics such as manifold wall wetting, air charging, and injector phasing. The effects of throttle body and manifold temperature were investigated and a comparison of speed-density and mass-flow metering strategies was made.
A simple continuous flow model was developed to predict the effects of manifold air charging and wall wetting. Comparisons of model predictions and experimental results show the agreement for air flow to be within ± 4%.
Wall wetting is described by a linear, first-order equation with two parameters; a boiling time constant, and a percent impaction parameter. Agreement between model prediction and experiment is good if the percent impaction parameter is allowed to vary linearly with throttle angle.
Recommended Content
Authors
Citation
Aquino, C., "Transient A/F Control Characteristics of the 5 Liter Central Fuel Injection Engine," SAE Technical Paper 810494, 1981, https://doi.org/10.4271/810494.Also In
References
- James S. Dickenson H. C. Sparrow S. W. “Intake-Manifold Temperatures and Fuel Economy.” SAE Transactions V. 15, Part II 1920
- Eisinger J. O. “Engine-Acceleration Tests.” SAE Transactions V. 22, Part II 1927
- Stivender D. L. “Engine Air Control-Basis of a Vehicular Systems Control Hierarchy.” SAE Paper No. 780346 1978
- Wu H. “A Computer Model for a Centrally-Located, Closed-Loop, Automotive Fuel Metering System.” Presented at ASME International Computer Technology Conference San Francisco, CA August 1980
- Blumberg P. N. Wu H. Auiler J. E. “A Methodology for Evaluation and Optimization of Three-Way Catalyst Based, Low NO x Emission Control Systems.” To be presented at 1981 SAE International Congress and Exposition Detroit, MI February 1981
- Hires S. D. Overington M. T. “Transient Mixture Strength Excursions: An Investigation of Their Causes and the Development of a Constant Mixture Strength Fueling Strategy.” To be presented at 1981 SAE International Congress and Exposition Detroit, MI February 1981
- Czadzeck G. H. Reid R. A. “Ford's 1980 Central Fuel Injection System.” SAE Paper No. 790742 1979
- Hamburg D. R. Hyland J. E. “A Vaporized Gasoline Metering System for Internal Combustion Engines.” SAE Paper No. 760288 1976
- Eridgeman O. C. “Equilibrium Volatility of Motor Fuels from the Standpoint of Their Use in Internal Combustion Engines.” National Bureau of Standards Research Paper No. R.P 694 1934
- Haslett R. A. Edison T. M. “Equivalence Ratio Meter.” SAE Paper No. 770219 1977
- Iberall A. S. “Attenuation of Oscillatory Pressures in Instrument Lines.” National Bureau of Standards Research Paper No. R.P. 2115 1950
- Wu H. Blumberg P.N. “An Attenuation and Transport Delay Model for Single Point Closed-Loop Fuel Metering Systems.” SAE Paper No. 790172 1979
- Taylor C. F. Taylor E. S. “The Internal Combustion Engine.” Second Edition International Textbook Co. 1970