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Diesel oxidation catalysts and diesel particulate filters are standard aftertreatment systems in Diesel engines which are traditionally placed downstream of the turbine. However, pre-turbo aftertreatment configurations are being approached as a way to improve the aftertreatment performance in terms of light-off and passive regeneration. This exhaust line architecture can also benefit fuel economy...
This paper corresponds to the second part of a work devoted to analyse the impact of the pre-turbo aftertreatment configuration on the performance of a single stage turbocharged Diesel engine. This second part focuses on the analysis of the engine response under transient operating conditions. To address the causes and effects of the change in engine response several types of transient processes consisting...
Current energy and environmental situations have been driving the development of new alternative energies, especially in transportation sector. The objective of this research is to present a decision support methodology to compare engine torques between using the average value and the new approach called response surface. This research investigates the engine torques from neat diesel fuel (WPO (waste...
For a fuel system with a tangent cam or a constant-velocity cam, the peak injection pressure continues to rise as the injection duration increases, but overly high peak pressures induce mechanical loads and wear, limiting the maximum engine speed and injection quantity. To improve the performance of an EUP (Electronic Unit Pump) fuel system for heavy-duty diesel engines, this work proposes a new pump...
This study investigated the influence on the combustion characteristics and particulate emissions of a diesel engine fueled with DBE (diesel-biodiesel-ethanol) blended fuels. The effects on in-cylinder pressure, heat release rate, combustion duration, diffusion fuel mass, BSPM (brake specific particulate mass) and BSPN (brake specific number concentrations) when diesel-biodiesel is blended with 0%,...
This paper proposes a segmented thermoelectric generator (TEG) that can be used to recover exhaust waste heat from a diesel engine (DE). A mathematic model of the segmented TEG was constructed based on the low-temperature thermoelectric material bismuth telluride and the medium-temperature thermoelectric material skutterudite. Performance was compared between segmented and traditional TEGs, and the...
Electricity in Canadian remote areas is, historically, produced using Diesel generators. Its total production cost is very high not only due to inherent cost of fuel but also due to transportation and maintenance costs. Moreover, the use of fossil fuels is a significant source of greenhouse gas emissions. Hybrid systems that combine wind turbines and diesel generators reduce fuel consumption, operational...
The oil obtained by pyrolysis of waste plastics can be used as an alternate fuel for diesel engine without making any modification to the engine. The WPPO (waste plastic pyrolysis oil) mixed with 5% and 10% DEE (diethyl ether) were used as fuels for single cylinder water cooled, DI engine and its performance, emission and combustion characteristics were found. The experimental results indicated the...
In this investigation, CB (Carbon black) was doped with diesel by following certain sequential processes and the mixture was commonly referred to as Carbodiesel. The mixture containing 5% CB was denoted as Carbodiesel5. Similarly, 10%, 15% and 20% CB in Carbodiesel were denoted as Carbodiesel10, Carbodiesel15 and Carbodiesel20 respectively. All the four Carbodiesels were used as alternative fuels...
PODEn (Polyoxymethylene dimethyl ethers) have high oxygen content, cetane number and good solubility in diesel fuel. In this work, pure diesel and PODE3-4/diesel blends with 10–20% PODE3-4 by volume were tested in a light-duty direct injection diesel engine without any modifications on the engine fuel supply system. Engine performance, combustion and emission characteristics were compared at various...
The injected diesel fuel used in a diesel engine was partially replaced with biomass-derived gas through the intake port, and the effect on performance and pollutant emissions was studied. The experimental work was carried out in a supercharged, common-rail injection, single-cylinder diesel engine by replacing diesel fuel up to 20% (by energy), keeping constant the engine power. Three engine loads...
The pressure drop across DPFs directly affects the exhaust back-pressure and fuel economy of compression ignition engines. Pressure drop is related to the soot trapped inside the DPF, increasing exhaust back-pressure as the soot mass loading does. Consequently, regeneration strategies are required to remove the soot collected in the DPF. However, these processes usually involve additional fuel consumption...
Biodiesel can be produced from animal fats or vegetable oils with methanol or ethanol as the catalyst via transesterification. Although blends of biodiesel/diesel/alcohol are well known in emission reduction, butanol has been recently found to have economic and sustainable potentials as a substitute for ethanol in diesel blends. This study investigates the emissions of CBCs (carbonyl compounds) and...
This paper presents the parametric optimization and performance analysis of ORC (organic Rankine cycle) system using GA (genetic algorithm) for recovering exhaust waste heat of a diesel engine. First, the effects of three key parameters, including evaporation pressure, superheat degree and condensation temperature on the system performances are conducted with POPA (net power output per unit heat transfer...
Earlier investigations on the utilisation of Carbon black-water-diesel emulsion in a DI (direct injection) diesel engine reported that the engine performance was inferior to that of diesel operation at full load in the same engine. The HC (hydrocarbon), CO (carbon monoxide) and smoke emissions were reported to be higher than those of diesel operation at full load. The poor mixture formation and lower...
The aim of the present work is to experimentally investigate the combined effects of compression ratio, nozzle opening pressure and injection timing on the performance and emissions of a CI (compression ignition) engine operated with an emulsion fuel obtained from CB (carbon black). The emulsion contained CB 10%, 2% water, 85% diesel and 3% surfactant was denoted as CBWD10. Tests were carried out...
The Miller cycle has been applied into the ICEs (internal combustion engines) to reduce NOx emissions, in the recent years. However, this method may decrease the engine power. The most common technique which improves the engine power is application of turbo charging. Thus, these two methods can be combined to make up for power loss and decrease emissions. In this study, the application of the Miller...
In this paper, the ORC (Organic Rankine cycle) technology is adopted to recover the exhaust waste heat of diesel engine. The thermodynamic, economic and optimization models of the ORC system are established, respectively. Firstly, the effects of four key parameters, including evaporation pressure, superheat degree, condensation temperature and exhaust temperature at the outlet of the evaporator on...
WPO (Wood pyrolysis oil) has the potential to replace a considerable volume of conventional fossil fuels. However, the application of WPO in a diesel engine is constrained because of its poor properties, including a low cetane number, high water content, and high viscosity. In this study, two strategies are adopted to facilitate the use of WPO in a compression ignition engine. First, the properties...
Experimental investigations were conducted on a diesel engine to evaluate the effects of hydrogen addition on engine combustion, unregulated gaseous emissions and particulate emissions based on the Japanese 13-mode testing cycle. A diesel–hydrogen co-operated combustion strategy is proposed in which hydrogen is naturally aspirated into the diesel engine to substitute 10, 20 and 30% of the total fuel...
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