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An Evaluation of Several Methods for Calculating Transient Trapped Air Mass with Emphasis on the “Delta P” Approach
Technical Paper
2005-01-0990
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Existing literature describes a method (termed the “Delta P” method) by which experimentally measured cylinder pressure data can be used to compute the mass of fresh air trapped within the cylinder of an IC engine. It is reported that this method provides a means for analyzing transient engine behavior on a cycle-by-cycle basis. The objective of the current paper is to examine the Delta P method in greater detail, and compare its strengths and weaknesses to other potential methods of computing cyclic trapped mass. It will be shown that although there are limits to its application, the Delta P method has advantages over other methods, and proves to be a useful analysis technique when transient engine operation is to be studied.
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Citation
Worm, J., "An Evaluation of Several Methods for Calculating Transient Trapped Air Mass with Emphasis on the “Delta P” Approach," SAE Technical Paper 2005-01-0990, 2005, https://doi.org/10.4271/2005-01-0990.Also In
Combustion and Flow Diagnostics, and Fundamental Advances in Thermal and Fluid Sciences
Number: SP-1971; Published: 2005-04-11
Number: SP-1971; Published: 2005-04-11
References
- Akimoto, A. Itoh, H. Suzuki, H. “Development of ΔP Method to Optimize Transient A/F Behavior in MPI Engine” JSAE 10 4 1989
- Worm, J. “The Effect of Exhaust Variable Cam Phaser Transients on Equivalence Ratio Control in an SI 4 Stroke Engine” SAE Paper 2005-01-0763
- Mladek, M. Onder, C. “A Model for the Estimation of Inducted Air Mass and the Residual Gas Fraction using Cylinder Pressure Measurements” SAE 2000-01-0958
- Fox, J. Cheng, W. Heywood, J. “A Model for Predicting Residual Gas Fraction in Spark-Ignition Engines” SAE 931025