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Appl. Sci. 2017, 7(3), 295; doi:10.3390/app7030295

Selected Issues of the Indicating Measurements in a Spark Ignition Engine with an Additional Expansion Process

Institute of Automobiles and Internal Combustion Engines, Division of Mechatronics, Cracow University of Technology, Al. Jana Pawla II 37, 31-864 Kraków, Poland
Academic Editor: Jose Ramon Serrano
Received: 1 February 2017 / Revised: 14 March 2017 / Accepted: 14 March 2017 / Published: 17 March 2017
(This article belongs to the Special Issue Internal Combustion Engines (ICE) for Ground Transport)
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Abstract

The paper presents the results of research on the turbocharged spark ignition engine with additional exhaust expansion in a separate cylinder, which is commonly known as the five-stroke engine. The research engine has been constructed based on the four cylinder engine in which two outer cylinders work as the fired cylinders, while two internally connected inner cylinders constitute the volume of the additional expansion process. The engine represents a powertrain realizing an ultra-expansion cycle. The purpose of the study was to find an effective additional expansion process in the five-stroke engine. Cylinder-pressure indicating measurements were carried out for one of the fired cylinders and the additional expansion cylinder. The study was performed for over 20 different points on the engine operation map. This allowed us to determine a dependence between the pressure indicated in the fired cylinders and in the additional expansion cylinders. A function of the mean pressure indicated in the additional expansion cylinder versus a brake mean effective pressure was also presented. This showed a load threshold from which the work of the cylinders of additional expansion produced benefits for the output of the experimental engine. The issues of mechanical efficiency and effective efficiency of this engine were also discussed. View Full-Text
Keywords: spark ignition; efficiency; Miller cycle; Atkinson cycle; five-stroke engine; additional expansion process spark ignition; efficiency; Miller cycle; Atkinson cycle; five-stroke engine; additional expansion process
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Noga, M. Selected Issues of the Indicating Measurements in a Spark Ignition Engine with an Additional Expansion Process. Appl. Sci. 2017, 7, 295.

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