Effects of Rate-Shaped and Multiple Injection Strategies on Pollutant Emissions, Combustion Noise and Fuel Consumption in a Low Compression Ratio Diesel Engine

D’Ambrosio, Stefano; Ferrari, Alessandro; Mancarella, Alessandro; Mittica, Antonio

doi:10.1007/s12239-020-0020-0

Cited by 8 publications

(9 citation statements)

References 41 publications

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“…For both fuels, the maximum Soot values are obtained with the TH shape. Similar results on Soot emissions for diesel fuel usage have been reported in [9,10,13,15,22]. Nevertheless, some different results were presented in [7], where, for increased values of injection rate at the beginning of the injection process on certain boot shapes, higher Soot emissions were disclosed.…”

Section: Resultssupporting

confidence: 78%

“…However, this effect is overpassed, and the trend is reversed in the case of the R1 test condition because of the elevated differences existing between the two fuels in terms of peak cylinder temperatures and combustion durations. Comparable results regarding the NO x emissions when using diesel fuel were reported in [9,10,12,13,15,18,21,22]. However, different results are presented in [7], where, for some increases applied at the beginning of the injection rate on certain boot shapes, the decrease of NO x emissions was registered.…”

Section: Resultsmentioning

confidence: 67%

“…Also, the combustion-generated noise can be reduced if there is a lower initial injected fuel mass, thus slowing down the early rapid rise of the heat release and peak pressure rise rate [7]. In other studies, the adoption of different shapes of the rate of injection has been achieved considering split injection strategies [8][9][10]. Changing the main injection shape has an important effect on the air-fuel mixing process, ignition delay and pollutant emissions.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Injection Rate Shape on Performance and Emissions of a Diesel Engine Fuelled by Diesel and Biodiesel B20

2022

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The combustion process in diesel engines is controlled by the injection rate shape. The stricter emission regulations requiring simultaneous reduction of nitrogen oxides and particulate matter imposes intense research and development activity for achieving clean and robust combustion. This work describes the experimental investigation made for calibration of an engine model and the numerical investigation performed to assess the influences of different injection rate shapes on performances of a diesel engine fuelled with diesel and rapeseed biodiesel B20. The engine model was developed with the AVL-BOOST code using the AVL-MCC combustion mode. The model was calibrated for the reference Top-Hat injection rate shape using experimental data registered for maximum brake torque and maximum brake power speed conditions. Other injection rate shapes such as triangular, trapezoidal, and boot having the same area, start, and duration of injection were investigated in terms of combustion characteristics, performance, and pollutant emissions. The link existing between the injection characteristics and the NOx and Soot emissions highlights that, for the optimal rate of injection shape, a simultaneous reduction of NOx and Soot by 11%, respectively 4% for maximum brake torque and by 22%, respectively 7% for maximum brake power, can be obtained using biodiesel B20.

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Section: Resultssupporting

confidence: 78%

Section: Resultsmentioning

confidence: 67%

Section: Introductionmentioning

confidence: 99%

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Effects of Injection Rate Shape on Performance and Emissions of a Diesel Engine Fuelled by Diesel and Biodiesel B20

2022

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“…13 Recent experiments by d'Ambrosio et al with a diesel engine have shown that at medium loads, a very short DT decreases combustion noise and offers lower BSFC than other advanced injection strategies, such as boot injection. 14 Considering the importance of pollutant emission and that fusion injection may be beneficial to diesel engine fuel consumption, the objective of this work is to propose a simple model that allows predicting the ROI for single and double injection with and without the presence of fusion. Proposing a simple ROI model is of interest because it can be easily implemented to predict CFD calculation inputs 8,15 or to predict, at the ECU, the injected fuel mass using the injection pressure.…”

Section: Introductionmentioning

confidence: 99%

A rate-of-injection model for predicting single and double injection with or without fusion

Tétrault

Seers

2023

International Journal of Engine Research

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Models used to predict the instantaneous injected fuel mass are of varied interest in automotive applications, including for providing inputs to CFD calculations or for engine control. While multiple injection strategies are now commonly used in diesel engines, the overall approach may be susceptible to injection fusion, which is defined as two successive injections that are partly or totally coupled due to the short time interval between each event. In this work, a new model to predict the instantaneous mass flow rate from a diesel injector is proposed based on the analytical solution of a first-order linear dynamic system exposed to an impulsion. Experiments are also conducted to quantify the main injection characteristics of a solenoid indirect-action injector under different injection pressures, backpressures and injection durations, representing a total of 33 different conditions. From these results, a model is proposed and validated against experimental data using a single injection strategy. Then, the model is enhanced to predict split injection with and without injection fusion. Successful comparisons are realized between the model and the experiment. The model is then used to successfully simulate a piezoelectric injector experiencing different levels of fusion available in the literature so as to illustrate the universality of the proposed approach.

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“…By combustion of the amount of pilot injected fuel, there is a slight increase in pressure and temperature in the cylinder before the main injection. This reduces the ignition delay of the fuel amount delivered in the main injection, the combustion process developing more during the third stage, that of diffusive combustion with a lower peak temperature which causes a decrease in the formation of NO x emissions [1].…”

Section: Introductionmentioning

confidence: 99%

The effects of split direct injection on the operation of a tractor diesel engine fueled by biodiesel B20

2021

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The use of biodiesel-diesel blends is a current solution to some important problems, such as the depletion of oil resources, global warming, and the pollutant emissions of smoke, carbon monoxide, and hydrocarbons of diesel engines. However, the use of this alternative fuel is characterized by a reduction in engine effective power and an increase in brake-specific fuel consumption and nitrogen oxide pollutant emissions. Using the AVL MCC zero-dimensional combustion model of the AVL BOOST simulation program, it was evaluated to what extent split injection strategies can improve the performance and fuel economy of a tractor diesel engine fuelled with biodiesel B20 at maximum brake torque condition considering noise and pollutant emissions limitation. Various pilot – main – post split injection strategies have been studied to establish the optimal injection characteristics in terms of performance and fuel economy. Subsequently, they have been adapted in terms of compliance with current emission standards. In this way, it has been emphasized that the split injection solution is a viable way to improve performance, economy, and pollutant emissions of a tractor diesel engine.

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Effects of Rate-Shaped and Multiple Injection Strategies on Pollutant Emissions, Combustion Noise and Fuel Consumption in a Low Compression Ratio Diesel Engine

Cited by 8 publications

References 41 publications

Effects of Injection Rate Shape on Performance and Emissions of a Diesel Engine Fuelled by Diesel and Biodiesel B20

Effects of Injection Rate Shape on Performance and Emissions of a Diesel Engine Fuelled by Diesel and Biodiesel B20

A rate-of-injection model for predicting single and double injection with or without fusion

The effects of split direct injection on the operation of a tractor diesel engine fueled by biodiesel B20

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