Divided Exhaust Period Implementation in a Light-Duty Turbocharged Dual-Fuel RCCI Engine for Improved Fuel Economy and Aftertreatment Thermal Management: A Simulation Study

Bharath, Anand Nageswaran; Reitz, Rolf D.; Rutland, Christopher J.

doi:10.4271/2018-01-0256

Cited by 4 publications

(7 citation statements)

References 23 publications

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“…Therefore, increasing the exhaust temperature via VVT and LIVC modulation is worthy of consideration. The divided exhaust period (DEP) concept was proposed by Bharath et al [69], as shown in Figure 12, with the actuated exhaust valves separated by variable valve actuation. The exhaust flow was designed to be split into two manifolds, thereby lowering the overall engine backpressure as well as decreasing pumping losses-especially at medium and high loads.…”

Section: Technologies Of Pumping Loss Reductionmentioning

confidence: 99%

A Review of Energy Loss Reduction Technologies for Internal Combustion Engines to Improve Brake Thermal Efficiency

Wang

Shuai

et al. 2021

Energies

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Today, the problem of energy shortage and climate change has urgently motivated the development of research engaged in improving the fuel efficiency of internal combustion engines (ICEs). Although many constructive alternatives—including battery electric vehicles (BEVs) and low-carbon fuels such as biofuels or hydrogen—are being put forward, they are starting from a very low base, and still face significant barriers. Nevertheless, 85–90% of transport energy is still expected to come from combustion engines powered by conventional liquid fuels even by 2040. Therefore, intensive passion for the improvement of engine thermal efficiency and decreasing energy loss has driven the development of reliable approaches and modelling to fully understand the underlying mechanisms. In this paper, literature surveys are presented that investigate the relative advantages of technologies mainly focused on minimizing energy loss in engine assemblies, including pistons and rings, bearings and valves, water and oil pumps, and cooling systems. Implementations of energy loss reduction concepts in advanced engines are also evaluated against expectations of meeting greenhouse gas (GHG) emissions compliance in the years to come.

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Section: Technologies Of Pumping Loss Reductionmentioning

confidence: 99%

A Review of Energy Loss Reduction Technologies for Internal Combustion Engines to Improve Brake Thermal Efficiency

Wang

Shuai

et al. 2021

Energies

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“…The backpressure is known as the greater static pressure exerted by exhaust muffler due to restriction in its design. Great backpressure can be seen in exhaust muffler which have the capabilities to eliminate great deal of noise from engine [2]. Excessive exhaust pressure in a system that can cause a system failure, such as failure in engine breathing system such as engine intake manifold and catalyst system failure in which its function is to reduce pollutant emission.…”

Section: Figure 3 Visualisation Of Velocity Streamline In Exhaust Manifold Modelmentioning

confidence: 99%

“…This is because exhaust gas velocity is influenced by engine speed that is measure in rotation per minute (rpm). Nonetheless, an engine equipped by stock exhaust system failed to produce its best performance compared to customized exhaust system [2]. The engine with stock exhaust system design failed to perform at its best performance due to the increase in backpressure which takes more energy from the engine and effecting the percentage of power output used to move the vehicle.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, it is important to have the right amount backpressure limit according to the engine size. The right amount of backpressure in exhaust system is capable to induce scavenging effect in the engine [2]. For the exhaust system to have minimum backpressure, it is crucial to design the exhaust manifold with a suitable bending angle in the pipe, as the sharp bending angle was found to reduce the speed of exhaust gas flow and resulted the backpressure to be higher when compared to the exhaust with a smoother bend [8].…”

Section: Introductionmentioning

confidence: 99%

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Flow characterisation in an exhaust manifold of a single-cylinder internal combustion engine (ICE)

Aziz

Rahman

Amin

et al. 2021

J. Phys.: Conf. Ser.

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This paper presents an investigation of flow characteristic inside the exhaust manifold that were designed with different bending angle (BA), bending radius (BR) and pipe diameter (Dp ). Five exhaust manifold models were developed and analysed by the computational fluid dynamic (CFD) method. Accordingly, the pressure distribution, velocity streamline and backpressure values were observed. The simulation results showed a different flow pattern for all five models, indicating the manifold design affect the flow characteristic inside the exhaust system. The results demonstrated that the pressure distribution inside the exhaust manifold is influencing its velocity streamline pattern, that directly effecting the outlet velocity of the exhaust gas. From this work, a small bending angle with a short straight pipe has led to a smoother exhaust flow and even exhaust velocity across the model. The results obtained from the simulation can be used as a guide to improve the understanding of the flow behaviour in the manifolds and might be used to improve the manifold design.

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“…Meanwhile, a divided exhaust period (DEP) technology has been studied as an effective approach for improving fuel efficiency and performance of turbocharged engines. The original idea of the technology started with a British patent in 1924 and has been investigated up to these days as introduced well in previous studies [18][19][20][21]. The schematics presenting the configuration and basic principle of the DEP engine are shown in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

Effect of Divided Exhaust Period in a High Efficiency TGDI Engine

Jung

Son

et al. 2021

Energies

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The divided exhaust period (DEP) concept was applied to a high-efficiency gasoline engine and its impact on various engine performance aspects were investigated. To this end, key design parameters of DEP components were optimized through 1-D engine simulation. The designed DEP components were fabricated and experimental verification was performed through an engine dynamometer test. The developed DEP engine shows suitable performance for electrified vehicles, with a maximum thermal efficiency of 42.5% as well as a wide sweet spot area of efficiency over 40%. The improvement in thermal efficiency was mainly due to a reduction in pumping loss. Notably, the reduction in pumping loss was achieved under high exhaust gas recirculation (EGR) flow conditions, where further improvements in fuel consumption could be achieved through a synergistic combination of DEP implementation and high dilution combustion. Furthermore, a significantly improved catalyst light-off time, uncharacteristic in turbocharged engines, was confirmed through a simulated cold-start catalyst heating engine test.

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Divided Exhaust Period Implementation in a Light-Duty Turbocharged Dual-Fuel RCCI Engine for Improved Fuel Economy and Aftertreatment Thermal Management: A Simulation Study

Cited by 4 publications

References 23 publications

A Review of Energy Loss Reduction Technologies for Internal Combustion Engines to Improve Brake Thermal Efficiency

A Review of Energy Loss Reduction Technologies for Internal Combustion Engines to Improve Brake Thermal Efficiency

Flow characterisation in an exhaust manifold of a single-cylinder internal combustion engine (ICE)

Effect of Divided Exhaust Period in a High Efficiency TGDI Engine

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