Abstract
The present study provides a feasible strategy for minimizing automotive CO2 emissions by coupling the principle of the Atkinson cycle with the use of bioethanol fuel. Motor cycles and scooters have a stroke to bore ratio of less than unity, which allows higher speeds. The expansion to compression ratio (ECR) of these engines can be altered by tuning the opening time of the intake and exhaust valves. The effect of ECR on fuel consumption and the feasibility of ethanol fuels are still not clear, especially for short stroke engines. Hence, in this study, the valve timing of a short stroke engine was tuned in order to explore potential bioethanol applications. The effect of valve timing on engine performance was theoretically and experimentally investigated. In addition, the application of ethanol/gasoline blended fuels, E3, E20, E50, and E85, were examined. The results show that consumption, as well as engine performance of short stroke motorcycle engines, can be improved by correctly setting the valve controls. In addition, ethanol/gasoline blended fuel can be used up to a composition of 20% without engine modification. The ignition time needs to be adjusted in fuel with higher compositions of blended ethanol. The fuel economy of a short stroke engine cannot be sharply improved using an Atkinson cycle, but CO2 emissions can be reduced using ethanol/gasoline blended fuel. The present study demonstrates the effect of ECR on the performance of short stroke engines, and explores the feasibility of applying ethanol/gasoline blended fuel to it.
Highlights
By the end of 2015, the number of registered motorcycles in Taiwan totaled 21.4 million [1], tantamount to the overall population
The performance of ethanol in IC engines has been studied for several decades [14,15,16], and the results show that the brake thermal efficiency (BTE), volumetric efficiency and brake mean effective pressure (BMEP) are all higher with ethanol
It is the Atkinson cycle has been proposed. It was used for predicting engine performance noted that the top dead center (TDC) was defined as zero degree
Summary
By the end of 2015, the number of registered motorcycles in Taiwan totaled 21.4 million [1], tantamount to the overall population. In order to reach the CO2 emissions targets that have been widely agreed upon by industrialized nations, fossil fuel emissions caused by automobiles must be reduced. These global environmental issues and the depletion of fossil fuels can be partially addressed by increasing the use of biofuels and enhancing engine efficiency. The original Atkinson engine used a unique crankshaft that allowed the intake, compression, power, and exhaust strokes to occur during one turn of the crankshaft. The basic principle is that because the power (expansion) stroke is longer than the compression stroke, the efficiency is greater than that of an Otto-cycle engine. The original engine performance is calculated as the baseline
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