Effect of Injection Pressure and Engine Speed on Air/Fuel Mixing and Emissions in a Pre-Mixed Compression Ignited (PCI) Engine Using Diesel Fuel

Wåhlin, Fredrik; Cronhjort, Andreas; Olofsson, Ulf; Ångström, Hans-Erik

doi:10.4271/2004-01-2989

Cited by 18 publications

(6 citation statements)

References 18 publications

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“…There was no similar benefit gain from raising the injection pressure when running on four firing cylinders. In this case, consistent with the findings reported by Wa˚hlin et al 6 and Siewert et al, 10 although the soot emissions decreased, the BSCO and BSHC emissions increased.…”

Section: Co and Hcssupporting

confidence: 92%

“…At most operating points this required the SOI to be set at 3-4°CA before top dead centre (BTDC); more advanced timings were used at 2000 r/min and 2500 r/min, and at conditions of high EGR and low AFR. The more advanced SOI settings have previously been noted 6,7 to reduce the soot emissions but to increase the CO emissions and, at low EGR values, to increase the NO x emissions. At 1500 r/min, the SOI was 3°CA BTDC for NO x outputs over 1 g/kW h, advancing to about 10°CA BTDC when using the highest rates of EGR to achieve NO x values under 0.5 g/kW h.…”

Section: Basis For Comparisons and Restrictions On Settingsmentioning

confidence: 92%

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The influence of cylinder deactivation on the emissions and fuel economy of a four-cylinder direct-injection diesel engine

Zammit

McGhee

Shayler

et al. 2013

Proceedings of the Institution of Mechanical Engineers, Part D:

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The potential benefits and limitations of deactivating two of four cylinders by cam switching to disable the intake and exhaust valve lift were investigated experimentally on a turbocharged four-cylinder common-rail direct-injection diesel engine. When running on two firing cylinders, at light engine loads (a brake mean effective pressure of 2 bar, based on four-cylinder operation), the brake specific fuel consumption at given engine-out nitrogen oxide levels is comparable with or marginally better than when the engine is running on four cylinders. Cylinder deactivation allowed higher fuel rail pressures to be used to reduce the soot emissions while maintaining the advantages of lower carbon monoxide emissions and lower hydrocarbon emissions. At engine loads with a brake mean effective pressure of up to 3 bar on four cylinders, cylinder deactivation lowered the carbon monoxide and hydrocarbon emissions and raised the exhaust gas temperature by around 120 °C but, at higher loads, the fuel economy deteriorated and the soot and nitrogen oxide emissions increased markedly. The benefits of cylinder deactivation are therefore limited to light-load operating conditions, where the fuel economy is improved, the hydrocarbon and carbon monoxide emissions are reduced and the exhaust gas temperature is raised.

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Section: Co and Hcssupporting

confidence: 92%

Section: Basis For Comparisons and Restrictions On Settingsmentioning

confidence: 92%

The influence of cylinder deactivation on the emissions and fuel economy of a four-cylinder direct-injection diesel engine

Zammit

McGhee

Shayler

et al. 2013

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…DDF engines is more advantage than a dedicated engine (uses natural gas as their only fuel source) because of its high thermal efficiency and low soot/NOx emissions (3) . However, unburned hydrocarbons, especially CH4, and CO from incomplete combustion are high relative to emissions from diesel combustion (4)(5)(6)(7) . PTT Research & Technology Institute has also introduced the new DDF combustion concept for light-duty diesel engine applications called Dual Fuel-Premixed Charge Compression Ignition (DF-PCCI), in which injection timing, amount of EGR usages, and throttle angle position are fully controlled by Engine Control Unit (ECU) corresponding to various engine speeds and load requirements while the ratio of CH4 to diesel fuel amount usages is under 70:30.…”

Section: Introductionmentioning

confidence: 99%

Investigations of Catalytic Methane Oxidation under Lean Wet Exhaust Conditions

Jirawongnuson

Suthiprasert

Aroonsrisopon

et al. 2019

IJAE

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This current research work has been focused on Methane (CH4) reduction in a Diesel Oxidation Catalyst (DOC) emitted from a Dual Fuel-Premixed Charged Compression Ignition (DF-PCCI) engine. This new alternative combustion technology is implemented on a Diesel Engine powered by both diesel fuel and natural gas in order to reduce diesel fuel usage and maintain the same thermal efficiency. However, the drawback lies in higher amount of CH4 in the exhaust that might effects Original Equipment Manufacturer (OEM)'s DOC performance. In this work, thermophysical and chemical properties of DF-PCCI exhaust such as temperature, flow rate, and specie concentrations are varied to investigate their effects on CH4 conversion efficiency in DOC. Design of Experiment (DOE) is built and tested in a Synthetic Exhaust Gas Generating System that can simulate the DF-PCCI exhaust-like conditions and all tested parameters are fully controlled. The experimental matrix is selected to cover DF-PCCI exhaust condition ranges to optimizing CH4 treatment. A kinetic model with water concentration is also investigated and compared to DOE model and experimental data. It is shown that the major factors that influence methane oxidation are exhaust flow rate, H2O concentration, and exhaust temperature (at P-value < 0.05 or at confidence level of 95%). The DOE model for predicting CH4 reductions is also generated.

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“…Related research has been presented by several research groups. ,− Furthermore, the diesel industry has extensive experience with direct fuel injection and advanced charge preparation techniques. Techniques have been developed that can help the utilization of needed premixed combustion modes. − Mixture stratification modifies local equivalence ratios and has been suggested as a potential mechanism for controlling HCCI combustion.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of the Effects of Charge Stratification on Combustion and Emissions

Zheng

Yao

2007

Energy Fuels

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A fully coupled multidimensional computational fluid mechanics and reduced chemical kinetics model is adopted to investigate the effects of charge stratification on combustion and emissions. Seven different kinds of imposed stratification have been introduced according to the position of the maximal local fuel/air equivalence ratio in the cylinder at intake valve close. The results show that the charge stratification results in stratification of the in-cylinder temperature. The former four kinds of stratification, whose maximal local equivalence ratios locate between the cylinder center and half of the cylinder radius, advance ignition timing, reduce the pressurerise rate, and retard combustion phasing. But the following three kinds of stratification, whose maximal local equivalence ratios appear between half of the cylinder radius and the cylinder wall, have little effect on the cylinder pressure. For the two discussed equivalence ratios, all kinds of stratification can reduce unburned fuel emissions; all kinds of stratification can reduce formaldehyde emissions when the mixture is lean, and only the last two kinds of stratification can reduce formaldehyde emissions when the mixture is comparatively rich; the former four kinds of stratification deteriorate the CO and NOx emissions, and the last two kinds of stratification can reduce unburned fuel, formaldehyde, and CO emissions and maintain low NOx emissions simultaneously.

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Effect of Injection Pressure and Engine Speed on Air/Fuel Mixing and Emissions in a Pre-Mixed Compression Ignited (PCI) Engine Using Diesel Fuel

Cited by 18 publications

References 18 publications

The influence of cylinder deactivation on the emissions and fuel economy of a four-cylinder direct-injection diesel engine

The influence of cylinder deactivation on the emissions and fuel economy of a four-cylinder direct-injection diesel engine

Investigations of Catalytic Methane Oxidation under Lean Wet Exhaust Conditions

Numerical Simulation of the Effects of Charge Stratification on Combustion and Emissions

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