Abstract
Gasoline engines needs to reduce its negative emission waste and raise its thermal efficiency. Previous studies have shown an improvement of engines by regulating the ignition timing and retaining the engine at certain air-to-fuel ratio. Additional development of the thermal efficiency is anticipated by reducing the oscillation of pressure due to combustion (referred to as combustion fluctuation) during each cycle. Reducing the combustion fluctuations promotes the generation of a stable combustion field and improves fuel consumption. Since the combustion fluctuations are significantly affected by the in-cylinder pressure at compression top dead center (referred to as TDC pressure), the present study proposes a method to estimate the TDC pressure in the next cycle. The estimation was conducted by measuring the in-cylinder pressure at exhaust valve opening in the given cycle. This study also developed the method to reduce the combustion fluctuations by using the TDC pressure estimation and controlling the ignition timing. In our experiments, it was found that the developed methods reduced the fluctuations of the indicated mean effective pressure (IMEP), the maximum in-cylinder pressure, and the TDC pressure by 62.1%, 51.2%, and 38.5%, respectively.
Highlights
In response to the requirements for increasing the fuel efficiency and reducing the harmful exhaust gas generation in gasoline engines, the previous studies have observed some of the regulatory requirements by adjusting the air-to-fuel ratio (A/F), the timing for ignition, and other performance factors of engine [1–9]
The quantitative evaluation, the standard deviation, the averaged value, and the oscillation ratio of PIMEP and Pmax under the condition 1 at each of the four A/Fs are shown in Table 3, where the fluctuation ratio was defined as the standard deviation divided by the average value
We considered a method for the estimation of the TDC pressure in the cycle and proposed a method for the reduction of combustion fluctuation based on the estimated TDC pressure through the ignition timing control
Summary
In response to the requirements for increasing the fuel efficiency and reducing the harmful exhaust gas generation in gasoline engines, the previous studies have observed some of the regulatory requirements by adjusting the air-to-fuel ratio (A/F), the timing for ignition, and other performance factors of engine [1–9]. One factor is not considered as part of improving the variation of pressure in the combustion stroke per cycle. This factor is known as “combustion fluctuation” and degrades the engine performance. The techniques such as the lean-burn and the exhaust gas recirculation (EGR) have been proposed for improving the fuel consumption and the exhaust gas emission, they give an increase in the combustion fluctuation. Some studies have reported that the reduced combustion fluctuation can decrease the harmful exhaust emissions and increase the fuel efficiency [10– 16]. It is expected to develop a new method that consider the reduction of combustion fluctuation
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