In internal combustion engines, cycle-to-cycle and cylinder-to-cylinder variations of the process have been shown to negatively impact fuel efficiency engine lead higher exhaust emissions. The are generally tied differences in composition condition trapped mass throughout each cycle across individual cylinders. Thus, advanced engines featuring gas recirculation, flexible valve actuation systems, fueling strategies, turbocharging systems prone exhibit process. this study, a dual-fuel...

Abstract One of the main factors limiting efficiency spark-ignited (SI) engines is occurrence engine knock. In high temperature and pressure in-cylinder conditions, fuel–air mixture auto-ignites creating shock waves in cylinder. Knock can significantly damage hinder its performance; as such, conservative knock control strategies are generally implemented which avoid such operating conditions at cost lower thermal efficiencies. Significant improvements performance conventional controllers...

In-cylinder pressure oscillations in internal combustion engines have been associated with increased heat losses and damages to the engine components. The links between acoustic waves transfer (and potentially ensuing damages) not yet well understood. In this study, a high-fidelity large eddy simulation model incorporating an auto-ignition is used simulate process oscillation at various operating conditions. study serves develop better understanding of chamber their effect on wall transfer....

In-cylinder pressure is a critical metric that used to characterize the combustion process of engines. While this variable measured on many laboratory test beds, in-cylinder transducers are not common production As such, accurate methods predicting cylinder have been developed both for modeling and control efforts. This work examines cylinder-specific model dual fuel compression ignition engine. links key engine input variables outputs including indicated mean effective (IMEP) peak pressure....

The desire to meet rising energy demands while simultaneously adhering stringent climate policies has propelled advanced combustion technologies and alternative fuels. Natural gas (NG) is an attractive, domestically-available that been shown achieve high efficiencies when used on dual fuel engines. However, the composition of NG can vary significantly depending source these variations may detrimentally impact engine operation. To study effects, a simulation model was developed calibrated...

One of the main factors limiting efficiency spark-ignited engines is occurrence engine knock. In high temperature and pressure in-cylinder conditions, fuel-air mixture auto-ignites creating shock waves in cylinder. Knock can significantly damage hinder its performance; as such, conservative knock control strategies are generally implemented that avoid such operating conditions at cost lower thermal efficiencies. Significant improvements performance conventional controllers possible if...