Miller cycle application to improve lean burn gas engine performance

Tavakoli, S.; Jazayeri, Seyed Ali; Fathi, Morteza; Jahanian, Omid

doi:10.1016/j.energy.2016.04.102

Cited by 28 publications

(6 citation statements)

References 14 publications

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“…In contrast, the EIVC mode only achieves a BSFC reduction of 2.0% compared with the base cam [65]. It is worth noting that the ideal efficiency is higher in the case of EIVC because of the lower compression work compared with LIVC [60,66]. However, detailed investigations have determined that EIVC has an adverse effect on in-cylinder charge motion and requires sophisticated optimization of the combustion system [33,67,68].…”

Section: Over-expansion Cyclesmentioning

confidence: 96%

“…The EIVC mode results in stable engine performance over a wide range of engine speeds, while the advantage of LIVC in conjunction with BTE is only evident at high speeds [57]. However, it has been demonstrated that EIVC leads to considerable power loss at wide open throttle (WOT) conditions, especially at high speeds [58,59], such that a higher intake boost pressure is needed to compensate [60]. Previous studies [61,62] found that LIVC effectively suppresses knocking and reduces BSFC by up to 6.9% along with a significant increase in the low BSFC operating region [63,64].…”

Section: Over-expansion Cyclesmentioning

confidence: 99%

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Recent Progress in Automotive Gasoline Direct Injection Engine Technology

Shuai

et al. 2018

Automot. Innov.

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Gasoline direct injection (GDI) engines are currently the dominant powertrains for passenger cars. With the implementation of increasingly stringent fuel consumption and emission regulations worldwide, GDI engines are facing challenges owing to high particulate matter emissions and a tendency to knock, leading to a change in the research and design (R&D) issues compared with those in the twentieth century. This paper reviews the progress in research regarding GDI engine technologies over the past 20 years, focusing on combustion system configurations, and also highlights common issues in GDI R&D, including preignition and deto-knock, soot formation and PM emissions, injector deposits and gasoline compression ignition (GCI). First, an overview of recent developments in the field as driven by regulations is provided, following which progress in injection and combustion systems is examined. Third, the review addresses the occurrence and mechanism of deto-knock and considers means of suppressing this phenomenon. The fourth section discusses soot formation mechanisms and particulate matter emission characteristics of GDI engines and describes the application of gasoline particulate filter (GPF) after-treatment. The subsequent section summarizes studies regarding injector deposit formation, as well as pioneering research into GCI combustion modes. Finally, a summary and future prospects for GDI engine technologies are provided.

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Section: Over-expansion Cyclesmentioning

confidence: 96%

Section: Over-expansion Cyclesmentioning

confidence: 99%

Recent Progress in Automotive Gasoline Direct Injection Engine Technology

Shuai

et al. 2018

Automot. Innov.

View full text Add to dashboard Cite

show abstract

“…The problem of intake and exhaust reversal is more prominent when the diesel engine is operated at high altitudes. As the altitude increases, the efficiency of the turbocharger compressor decreases, and the stable working range narrows, leading to surge in advance and difficulty in adjusting the optimal air-fuel ratio, which, in turn, leads to problems such as the rising exhaust temperature, large fluctuations in the EGR rate, and slow EGR response [38].…”

Section: Introductionmentioning

confidence: 99%

Optimization of Miller Cycle, EGR, and VNT on Performance and NOx Emission of a Diesel Engine for Range Extender at High Altitude

Weichao

Wang

et al. 2022

Energies

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Due to the increasing sales of extended-range hybrid vehicles and the increasingly stringent emission regulations for light vehicles in China, the performance and emission of diesel engines for range extenders in the plateau region have attracted increasing attention. In order to obtain the superior performance of diesel engines for range extenders operating at high altitudes, a multi-objective optimization of the optimal economic operating point of the diesel engine was performed at an altitude of 1960 m. A diesel engine system model with MC-EGR-VNT (MEV) technology was developed using GT-Power based on the data of the engine bench to analyze the effects of the Miller cycle (MC), exhaust gas recirculation (EGR), and variable nozzle turbine (VNT) technologies on the power, economy, and emission performance of high-speed diesel engines. The response surface method (RSM) design was carried out with the Miller cycle rate (MCR), EGR value opening, VNT nozzle opening as variable factors and torque, brake-specific fuel consumption (BFSC), nitrogen oxide (NOx) emission as optimization objectives based on Box Behnken Design (BBD). The optimization results showed that the torque and BFSC remained almost constant, and NOx emission decreased by 59.5% compared with the original machine. The proposed multi-objective optimization method could make the diesel engine with a MEV system achieve a good comprehensive performance.

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“…The experimental results show that the Miller cycle combined with intake humidification can effectively reduce NOx emissions and it is better than use the Miller cycle alone. Tavakoli et al [15] applied the Miller cycle to a lean-burn natural gas engine and analyzed the performance and emission characteristics of a four-stroke supercharged gas engine using a finite volume method. The results show that the late intake valve closing improves engine performance, but the peak pressure and temperature variation in the cylinder is not significant.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Miller cycle on the performance and emission in a natural gas-diesel dual-fuel marine engine by using two zone combustion model

et al. 2020

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Compared to the standard cycle, the Miller cycle decreases the cylinder maximum combustion temperature which can effectively reduce NOx emissions. In this paper, a 0-D two-zone combustion model is used to establish the simulation model of a marine dual-fuel engine, which is calibrated according to the test report under different loads. Due to the high emissions under part load, the Miller cycle (early intake valve closing method) is used for optimization. By analyzing the cylinder pressure, temperature, heat release rate, and NOx emissions under different cases, it can be found that the effective working volume and thermal efficiency decrease with the advance of intake valve closing and improve with the increase of the geometric compression ratio. In all optimization cases, the NOx emissions and fuel consumption are reduced by 72% and 0.1%, respectively, by increasing the geometric compression ratio to 14 and the intake valve closing timing to 510 °CA (the reference top dead center is 360 °CA). The simulation results show that the early intake valve closing Miller cycle can effectively reduce the NOx emissions and cylinder peak pressure.

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Miller cycle application to improve lean burn gas engine performance

Cited by 28 publications

References 14 publications

Recent Progress in Automotive Gasoline Direct Injection Engine Technology

Recent Progress in Automotive Gasoline Direct Injection Engine Technology

Optimization of Miller Cycle, EGR, and VNT on Performance and NOx Emission of a Diesel Engine for Range Extender at High Altitude

Investigation of the Miller cycle on the performance and emission in a natural gas-diesel dual-fuel marine engine by using two zone combustion model

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