Wavelet Analysis of the Effect of Injection Strategies on Cycle to Cycle Variation GDI Optical Engine under Clean and Fouled Injector

Abstract

High fluctuation in cyclic variations influences engine combustion negatively, leading to higher fuel consumption, lower performance, and drivability problems. This paper examines the impacts of injection strategies (injection pressure, injection timing and injection duration) on the cyclic variation of gasoline spark ignition (SI) optical engine under clean and fouled injectors. The principal oscillatory modes of the cycle to cycle variation have been identified, and the engine cycles over which these modes may persist are described. Through the wavelet power spectrum, the presence of short, intermediate and long-term periodicities in the pressure signal have been detected. It was noticed that depending on the clean and fouled injector, the long and intermediate-term periodicities may span many cycles, whereas the short-period oscillations tend to appear intermittently. Information of these periodicities could be helpful to promote efficient control strategies for better combustion. The outcomes report that the cyclic variation of the IMEP happens on multiple timescales, and thus, display complex dynamics. As the fouled injector used, mainly intermittent high-frequency fluctuations are recognized.

Influence of Compression Ratio on Flywheel Dimension for a Naturally Aspirated Spark Ignition Engine: A Numerical Study

“…Table 6 compares the result of dynamic irregularity ( ) of the engine crankshaft rotation and the basic dimension of the flywheel due to the variation of the compression ratio. This dynamic irregularity becomes important since fluctuation in cyclic variations negatively affects engine performance as well [22]. Based on the Eqn.…”

Production of Biofuels from Biomass as an Approach Towards Sustainable Development: A Short Review

“…The biofuel combustion in an ICE reduces CO2 emissions because of the photosynthesis process that occurs in the biomass that is used as fuel. The use of fossil fuels for agricultural machinery and transportation in biomass production and biofuel production processes may lead to high GHG emissions [23], [24]. Contrarily, soil contamination by fertilizers, herbicides, and insecticides must be taken into consideration.…”