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Eyzat, P.
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Four-Octane-Number Method for Predicting the Anti-Knock Behavior of Fuels and Engines

Institut Français du Pétrole (France)-A. M. Douaud, P. Eyzat
Published 1978-02-01 by SAE International in United States
The “Four-Octane-Number Method” is a practical determination of the knock-resistance of fuels based on the autoignition delay concept and obtained through simple processing of the standard “Research” and “Motor” indices combined with two other indices specially defined.The knocking behavior of any engine can be specified once by measuring its octane requirement with 2 fuels for which the four octane numbers are known.The behavior of any fuel can be predicted without experimenting on all the engines thus identified if its four octane numbers are known.Extensive controls of the method have been performed over about 1000 samples for which the road octane numbers were measured. The method's predictions are within an average accuracy of 0.5 octane point.
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DIGITAP-An On-Line Acquisition and Processing System for Instantaneous Engine Data-Applications

Institut Francais du Pétrole (France)-A. Douaud, P. Eyzat
Published 1977-02-01 by SAE International in United States
A versatile data acquisition system for engine pressure-time history is described. The on-line system utilizes a 12-bit sample-and-hold A/D converter in conjunction with a mini-computer. The computer controls the acquisition process and performs data processing to generate the desired results. The time base for the system is generated by a shaft mounted disk and photoelectric sensors. On-line selection based on predefined criteria of particular interest is software implemented. Statistical data are available such as the standard deviation and the histogram of maximum pressure. Teletype print, XY plot and punched paper tape are standard outputs.Among the wide variety of potential applications of this system, some actual examples in such areas as cyclic variation, knock, friction losses and heat transfer are given.
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The Computer and Improvement of the Engine Carburetion System

P. Eyzat, A. Douaud
  • Technical Paper
  • 745080
Published 1974-01-01 by Societe des Ingenieurs de l'Automobile in France
Attempts are now being made to solve the problem of adapting spark-ignition engines and fuels by using varied concepts such as Research, Motor and Road Octane Numbers, Engine Severity, Lead Bonus, etc. All these open the way to statistical analysis rather than an interpretation of phenomena. The only reason these concepts have been developed is because of the fineness of the multiple and complex interactions of the phenomena involved, all of which have made theoretical methods unusable.The aim of this paper is to show that the reaearch done by I.F.P. and partially sponsored by G.I.M.T. make it possible to build models for the overall engine/fuel behavior in the range of light knocking. The basic parameters for such models are: spark timing, compression ratio, volumetric efficiency for the engine and equivalence ratio, ignition delay for the air fuel mixture.After demonstrating that it is possible to go from the pressure-temperature history to the delay properties:τ= A exp (B/T) p-n in which A,B and n, are properties of the air fuel mixturewe demonstrate that high and low running…
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A New Diesel Combustion Chamber - The Variable-Throat Chamber

Institut Francais du Pétrole-A. Ecomard, P. Eyzat
Société d'Etude des Machines Thermiques-B. Brisson
Published 1973-02-01 by SAE International in United States
This paper describes a variable-throat combustion chamber developed by I.F.P. and the Société d'Etude des Machines Thermiques. The chamber seems to offer advantages in overall efficiency with a reduced maximum pressure. It also shows a tendency to emit fewer pollutants than conventional combustion chambers. Design details are discussed, along with combustion speed, heat transfer coefficient, reliability testing, and emissions. The chamber is intended primarily for railroad locomotives.
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A New Look at Nitrogen Oxides Formation in Internal Combustion Engines

Institut Francais du Petrole-P. Eyzat, J. C. Guibet
Published 1968-02-01 by SAE International in United States
The theory presented here allows forecasting of nitric oxide emissions in spark ignition engines. Following preliminary review of possibilities of obtaining the equilibrium state, as well as the basic concept of medium temperatures, the authors suggest using kinetic calculations for estimating the NO content of both unburned and burned mixtures.After good correlation is obtained, particularly for lean mixtures, the calculation is used to determine the best combustion process by simulation on a computer.Since experiments show an important effect of the fuel-air heterogeneity, complementary simulating work is conducted in order to define the best fuel stratification laws.
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