Challenges for Increased Efficiency through Gasoline Engine Downsizing

Fraser, Neil; Blaxill, Hugh; Lumsden, Grant; Bassett, Michael

doi:10.4271/2009-01-1053

Cited by 176 publications

(78 citation statements)

References 18 publications

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“…Fraser et al [6] carried out a drive cycle simulation with a D-class vehicle to investigate the fuel consumption benefits that could be accrued through downsizing.…”

Section: Introductionmentioning

confidence: 99%

Optimisation of the vehicle transmission and the gear-shifting strategy for the minimum fuel consumption and the minimum nitrogen oxide emissions

Oglieve

Mohammadpour

Rahnejat

2017

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…Fraser et al [6] carried out a drive cycle simulation with a D-class vehicle to investigate the fuel consumption benefits that could be accrued through downsizing.…”

Section: Introductionmentioning

confidence: 99%

Optimisation of the vehicle transmission and the gear-shifting strategy for the minimum fuel consumption and the minimum nitrogen oxide emissions

Oglieve

Mohammadpour

Rahnejat

2017

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…The evaporation of water, expansion of steam, condensation of steam, interaction with the walls, and combustion evolution in the presence of WM and steam all require an accurate validated model. A similarly mild validation is proposed in [22] for the case of water injection upstream of the cylinder of a diesel engine. To introduce a feature in the pipe object to deal correctly with the evaporation and condensation of water.…”

Section: Numerical Modelingmentioning

confidence: 99%

Direct injection of water mist in an intake manifold spark ignition engine

Babu¹,

Rao²,

Tarigonda³

2015

Int. J. Automot. Mech. Eng.

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The purpose of this study is to investigate the effects of water mist (WM) injected directly into an intake manifold spark ignition (SI) engine. WM flows through a nozzle at the throttle body of the four-cylinder four-stroke multi-point injection engine for testing the performance of exhaust emission system. The water is pumped in mist form into the intake manifold with an air-fuel mixture through the nozzle, which is located on the throttle body. Experimental work and simulation methods are combined by the presence and absence of WM addition, and the performance as well as emission produced by the engine is analyzed. The Gamma Technologies (GT) methods are used to simulate the model with and without WM addition. The experimental results indicate that the standard engine performance can be used to validate the simulation model. The engine measures include various parameters such as brake power, torque, volumetric efficiency, spark advance timing, and the concentration of CO and NOx with water and without water addition to the SI engine (i.e., the power, torque, volumetric efficiency of the engine is increased up to 10%). The emission of NOx is found to be significantly reduced and that of CO does not change.

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“…Therefore, the first law of thermodynamics for a closed system can be reordered as follows: [2] where p c, Vc, mc and uc are the pressure, volume, mass and internal energy in the cylinder respectively. Along with the previous two basic equations, several sub-models are employed to estimate the blow-by flow, the instantaneous volume considering deformations in the combustion chamber, and the heat transfer and the corresponding wall temperatures.…”

Section: Diagnostic Of the Combustion Processmentioning

confidence: 99%

“…An attractive strategy to reduce fuel consumption on SI engines consists of downsized engines with direct injection systems, where the displacement decreases and a turbocharging system compensates this loss of engine size, so the new engine configuration delivers the same torque and power as the reference engine, showed in more detail in these reference [1][2][3]. This SI engine technology reduces the fuel consumption by increasing the compression ratio and specific heats of the working fluids, and also by reducing the pumping and friction losses as described by Coltman et al [4].…”

Section: Introductionmentioning

confidence: 99%

Influence of a low pressure EGR loop on a gasoline turbocharged direct injection engine

Luján

Climent

Novella

et al. 2015

Applied Thermal Engineering

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This paper presents an experimental study of a low pressure EGR loop on a spark ignition (SI) Gasoline Turbocharged Direct Injection (GTDI) engine that will improve the understanding on the advantages and disadvantages of this strategy. Two steady engine operating conditions were investigated, 10 bar and 17 bar at 2000 rpm. At partial load conditions a combustion, performance, air management and exhaust gas emissions study was performed in order to analyses the EGR effect on the GTDI engine. The main advantages found were the reduction in fuel consumption due to the better combustion phasing, and the reduction in pumping losses and heat losses through the cylinder walls. A reduction on NOx, CO and soot was also observed when introducing EGR at these operating conditions. The main disadvantage found was the water condensation after the intercooler. At high load conditions similar analysis and conclusions to the partial load conditions are obtained. The EGR also allowed the combustion to be phased in a more efficient angle by reducing the risk of knocking, which helped reduce the exhaust gas temperature, despite the elimination of the fuel enrichment strategy. A reduction on CO and soot raw emissions was also observed when introducing EGR, as observed at partial load conditions, but a high reduction in NOx, CO, HC and soot emissions was observed after the catalyst since the fuel enrichment strategy is eliminated when cooled EGR is introduced. The main disadvantage found was the turbocharger limitation since higher compression ratio is required in order to keep the same air mass flow as the reference conditions without EGR. The original turbocharger is not designed to provide this higher compression ratio at low engine speed and high load. Results confirm how introducing EGR is a suitable strategy to control knocking and reduce simultaneously exhaust gas temperature and fuel consumption, but the disadvantages found in this investigation must be solved to assure its feasibility as a powerful technology to be implemented in future SI engines.

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Challenges for Increased Efficiency through Gasoline Engine Downsizing

Cited by 176 publications

References 18 publications

Optimisation of the vehicle transmission and the gear-shifting strategy for the minimum fuel consumption and the minimum nitrogen oxide emissions

Optimisation of the vehicle transmission and the gear-shifting strategy for the minimum fuel consumption and the minimum nitrogen oxide emissions

Direct injection of water mist in an intake manifold spark ignition engine

Influence of a low pressure EGR loop on a gasoline turbocharged direct injection engine

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