Topic
Spark-ignition engine
About: Spark-ignition engine is a research topic. Over the lifetime, 4352 publications have been published within this topic receiving 66550 citations.
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TL;DR: In this paper, a theoretical model of the spark-ignition engine with a working fluid consisting of various gas mixtures has been implemented, and a wide range of engine parameters were studied, such as equivalence ratio, engine speed, maximum and outlet temperatures, brake mean effective pressure, gas pressure, and cycle thermal efficiency.
Abstract: This paper presents thermodynamic analysis of spark-ignition engine. A theoretical model of Otto cycle, with a working fluid consisting of various gas mixtures, has been implemented. It is compared to those which use air as the working fluid with variable temperature specific heats. A wide range of engine parameters were studied, such as equivalence ratio, engine speed, maximum and outlet temperatures, brake mean effective pressure, gas pressure, and cycle thermal efficiency. For example, for the air model, the maximum temperature, brake mean effective pressure (BMEP), and efficiency were about 3000 K, 15 bar, and 32%, respectively, at 5000 rpm and 1.2 equivalence ratio. On the other hand, by using the gas mixture model under the same conditions, the maximum temperature, BMEP, and efficiency were about 2500 K, 13.7 bar, and 29%. However, for the air model, at lower engine speeds of 2000 rpm and equivalence ratio of 0.8, the maximum temperature, BMEP, and efficiency were about 2000 K, 8.7 bar, and 28%, respectively. Also, by using the gas mixture model under these conditions, the maximum temperature, BMEP, and efficiency were about 1900 K, 8.4 bar, and 27%, i.e. with insignificant differences. Therefore, it is more realistic to use gas mixture in cycle analysis instead of merely assuming air to be the working fluid, especially at high engine speeds. Copyright © 2007 John Wiley & Sons, Ltd.
54 citations
TL;DR: The results showed that well-trained machine learning models can complement more complex physical model while also helping with optimizing the engine performance, emissions, and life.
53 citations
TL;DR: Using EGR and spark timing to control load of a spark-ignition methanol engine with wide open throttle (WOT) and stoichiometric mixture have been investigated experimentally, and its performance and emission characteristics were compared with the traditional control method by throttle.
53 citations
TL;DR: In this article, six types of fuel blends consisting of ethanol and isobutanol were mixed with gasoline at different volume rates and were tested on a four-cylinder spark ignition engine by varying the engine speeds and engine torques to evaluate their engine performance and exhaust emissions characteristics.
53 citations
TL;DR: In this article, a model which calculates the hydrocarbon emissions from an SI engine is presented, based on the assumptions that fuel is stored in crevices and oil film during intake and compression followed by desorption during expansion and exhaust.
Abstract: A model which calculates the hydrocarbon emissions from an SI engine is presented. The model was developed in order to obtain a better understanding of experimental results from an engine operating on different fuels and lubricants. The model is based on the assumptions that fuel is stored in crevices and oil film during intake and compression followed by desorption during expansion and exhaust. The model also calculates the amount of desorbed material that undergoes in-cylinder oxidation and exhaust port oxidation. The model successfully predicts the trends followed by varying different engine parameters. The effect of changing the lubricant is of the same order of magnitude as found experimentally, but the effect of changing the fuel could not be predicted very well by the model. A possible explanation is that the lubricant film thickness varies due to viscosity variations of the oil film, when the fuel is dissolved in the film. (A) For the covering abstract see IRRD 851463.
53 citations