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Locating the Main Conversion Period Exactly, Using a Newly Developed Characteristic Value of the Combustion Pressure in an SI Engine
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Abstract
This paper describes a new way to locate the position of the combustion process in a spark-ignited engine. This method uses a characteristic value which is calculated from indicated high pressure (Pmax). This calculation requires much less time than traditional methods and allows the on-board-management (OBM) system to predict misfire cycles, and therefore, to avoid them.
The new characteristic value correlates closely to given percentages of the rate of converted energy, and has been tested using high relative air/fuel ratios (λ), high rates of exhaust gas recirculation (EGR), and different fuels. Use of this method in the OBM system allows extremely sensitive adjustments of ignition timing (αIG), which maximize efficiency and minimize pollutant emissions.
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Gebauer, K. and Müller, H., "Locating the Main Conversion Period Exactly, Using a Newly Developed Characteristic Value of the Combustion Pressure in an SI Engine," SAE Technical Paper 940147, 1994, https://doi.org/10.4271/940147.Also In
References
- State of California, Department of Public Health “Technical Report of California Standards for Ambient Air Quality and Motor Vehicle Exhaust,” September 1960
- Malfunction and Diagnostic System Requirements for 1994 and Subsequent Model-Year Passenger Cars, Light-Duty Trucks and Medium-Duty Vehicles with Feedback Fuel Control Systems California Code of Regulations
- Klenk M. Moser W. Müller W. Wimmer W. “Misfire Detection by Evaluating Crankshaft Speed - A Means to Comply with OBDII,” SAE paper 930399
- Müller H. MTZ 1977
- Watanabe E. Fukutani I. “Knock Reduction of Spark-Ignition Engines by EGR,” SAE paper 860034
- Gatowski J. A. Balles E. N. Chun K. M. Nelson F.E. Ekchian J. A. Heywood J. B. “Heat Release Analysis of Engine Pressure Data,” SAE paper 841359
- Bertling H. 1974
- Kalghatgi G. T. “Spark Ignition, Early Flame Development and Cyclic Variations in I.C. Engines,” SAE-paper 870163
- Matekunas F. A. “Modes and Measures of Cyclic Combustion Variability,” SAE paper 830337
- Gassenfeit E. H. Powell J. D. “Algorithms for Air-Fuel Ratio Estimation Using Internal Combustion Cylinder Pressure,” SAE-paper 890300
- “Low Emission Vehicles/Clean Fuels and New Gasoline Specifications,” Progress Report California Air Resources Board December 1989
- Martin J. K. Plee S. L. Rembowski, D. J. Jr. “Burn Modes and Prior-Cycle Effects on Cyclic Variations in Lean-Burn Spark-Ignition Engine Combustion,” SAE paper 880201
- Moser W. 1988
- Robert Bosch GMBH 1988
- Lancaster D. R. Krieger R. B. Lienesch J. H. “Measurement and Analysis of Engine Pressure Data,” SAE-paper 750026
- Evans P. G. “A Fast Data-Acquisition System for Investigating Combustion Phenomena in Spark-Ignition Engines,” SAE-paper 840057