This paper proposes a technique for reconstructing the cylinder pressure traces of a spark-ignition engine based on three inputs: spark-timing, speed and load. This method is an extension of previous work for reconstructing cylinder pressure in a heavy-duty diesel engine [1]. The previous study utilized only two inputs for cylinder pressure reconstruction, e.g. engine speed and load, hence implying optimal combustion phasing. The new method adds one more input to allow reconstruction of pressure traces from cycles with combustion phasing altered based on emissions or knock constraints. The method was applied to a 4-cylinder, 2.4-liter DaimlerChrysler gasoline engine. Comparisons between measured and reconstructed cylinder pressure traces demonstrate that the method is applicable over the majority of the gasoline engine operating range. Reconstructed cylinder pressure traces have also been used to carry out engine heat transfer and heat release analyses. Problems associated with the application of this method to gasoline engine are also discussed.
In this paper, the authors introduce the development of a computer-based internal combustion engine teaching tool for the undergraduate and professional training courses. The teaching tool simulates a SI (Spark Ignition) engine running in a testing facility. The physical and mathematical models, as well as the control strategies that govern the engine’s operation are embedded within the tool. It works as a virtual engine, and at the same time it displays and explains the physics behind each working process of the engine using graphical and animation features. The teaching tool serves as an assistant for the instructor of the internal combustion engine course. It provides the students with a visual and interactive environment to learn the physical processes of the internal combustion engines faster and easier.
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