Characterisation of DISI Emissions and Fuel Economy in Homogeneous and Stratified Charge Modes of Operation

Shayler, P. J.; Jones, Stephen; Horn, George H.; Eade, D.

doi:10.4271/2001-01-3671

Cited by 8 publications

(4 citation statements)

References 7 publications

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“…This may help to produce more homogeneous mixture and reduce the time for fuel evaporation in DISI engine. Therefore, the SOI timing for ethanol fuel can be retarded to enhance anti-knock ability while maintaining the high quality of the mixture [26,27].…”

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confidence: 99%

Effects of direct injection timing of ethanol fuel on engine knock and lean burn in a port injection gasoline engine

Zhuang

Hong

2014

Fuel

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Improving engine efficiency and reducing its emissions are the major tasks of recent development in internal combustion technology [1]. This is driven by the society concerns about the global warming and the depletion in supply of fossil fuels. One of the feasible short-to-midterm solutions for addressing the concerns is to use renewable fuels such as ethanol. Many countries and areas have enacted legislations [2] or incentive policies to promote the use of ethanol and other bio/renewable fuels [3,4]. The use of ethanol and other bio/renewable fuels has brought new challenges to automotive sector to develop new technologies. Ethanol direct injection plus gasoline port injection (EDI + GPI) is one of the new technologies in recent development.Previous studies on SI engines found that using ethanol fuel could help to reduce unburned emissions such as carbon monoxide (CO) and hydrocarbon (HC) [5][6][7], enhance engine anti-knock ability [8,9], and improve lean burn performance [10,11]. In the current applications, ethanol is externally blended with gasoline at a specific ratio. The applications of this method decreased pollutant emissions and increased engine efficiency in certain engine conditions [12,13]. However, the vehicles may face problems of reduced vehicle coverage, difficult cold start [14], corrosion and reduced lubrication [15]. Moreover, due to the fixed ethanol/gasoline ratio, the ethanol's potential in reducing engine emissions and improving thermal efficiency cannot be fully exploited. Research has already shown that the optimal ethanol/gasoline ratio for maximizing engine efficiency and minimizing emissions was varied with the engine operation condition [6,7]. EDI + GPI dual-fuel injection, on the other hand, provides an opportunity to solve the problems and meet the requirements. It offers greater flexibility of using ethanol fuel because the ethanol and gasoline mixing ratio can be instantly altered according to the engine operation Effects of direct injection timing of ethanol fuel on engine knock and lean burn in a port injection gasoline engine AbstractEthanol is a promising alternative fuel for internal combustion engines due to its renewable feature. To make the use of ethanol fuel more effective and efficient, ethanol direct injection plus gasoline port injection (EDI + GPI) has been investigated in recent years. By directly injecting ethanol into the engine, the advantages of ethanol fuel such as high latent heat of vaporization, fast laminar flame speed, wide flammability and better low temperature combustion stability can be well utilized to enhance engine anti-knock ability and improve lean burn performance. For an engine equipped with direct injection (DI) system, start of injection (SOI) timing is an important control parameter which directly affects the engine performance. This paper reports the investigation to the effect of ethanol fuel SOI timing on knock mitigation and lean burn. Experiments were conducted on a 250 cc single cylinder spark ignition (SI) engine equipped with EDI ...

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confidence: 99%

Effects of direct injection timing of ethanol fuel on engine knock and lean burn in a port injection gasoline engine

Zhuang

Hong

2014

Fuel

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“…Accordingly, the lean burn operation load window would not be affected. Furthermore, the homogeneous mixture provided by the GPI might further improve the flame propagation in the stratified combustion, together with offsetting the impact of inhomogeneous mixture caused by the direct injection technology. , Therefore, the EDI + GPI engine has the application for the improvement of the stratified combustion.…”

Section: Introductionmentioning

confidence: 99%

Lean Burn Performance of a Spark Ignition Engine with an Ethanol–Gasoline Dual Injection System

Zhuang

Hong

2018

Energy Fuels

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A spark ignition (SI) engine with an ethanol direct injection (EDI) and gasoline port injection (GPI) system has been studied quite recently. In order to investigate its application, experiments were carried out on a single-cylinder 250 cm3 short stroke motorcycle SI engine, which is supplied with the ethanol–gasoline dual injection system. Experimental findings have revealed that EDI helped increase the lean combustion limit owing to the combination effects of the dual injection and ethanol fuel. At the identical engine speed and load, the lean burn limit in the dual injection model was, on average, 0.2 times higher than that in the corresponding single GPI model. Increasing ethanol energy ratio (EER) gave rise to the increase in the lean burn limit; nevertheless, the increase rate began reducing when the EER was above 48% and 42% at 4000 and 3500 rpm, correspondingly. Subsequently, late ethanol direct injection (LEDI), following the intake valve closing slightly extended the lean burn limit, probably, owing to the unsatisfactory mixture quality. Early ethanol direct injection (EEDI) prior to the intake valve closing was more helpful in increasing lean burn limit as compared with the LEDI. Nonetheless, further advance of spark timing earlier than 35 crank angle degress before top dead center (CAD BTDC) in LEDI situation, in addition 30 CAD BTDC in EEDI situation, might lead to reduction of the lean burn limit.

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“…Artificial Neural Network (ANN) is another method that can also be applied for the optimization of the fuel injection strategy. ANN is a method commonly used for information processing based on the way biological nervous systems process information (Stergiou & Siganos, 2015) and has been applied to the air-fuel ratio control (Lenz & Schröder, 1998), characterization of DISI emissions and fuel economy (Shayler, et al, 2001) and in powertrain simulation tools (Le berr, et al, 2008). Another way of optimizing the fuel injection strategy is to identify different events and processes, which take part during fuel injection phase and use appropriate phenomenological or semi-empirical models to include the effect of those events and processes in the optimization algorithm.…”

Section: Introductionmentioning

confidence: 99%

Optimization of fuel injection in GDI engine using economic order quantity and Lambert W function

Ventura

Samuel

2016

Applied Thermal Engineering

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Characterisation of DISI Emissions and Fuel Economy in Homogeneous and Stratified Charge Modes of Operation

Cited by 8 publications

References 7 publications

Effects of direct injection timing of ethanol fuel on engine knock and lean burn in a port injection gasoline engine

Effects of direct injection timing of ethanol fuel on engine knock and lean burn in a port injection gasoline engine

Lean Burn Performance of a Spark Ignition Engine with an Ethanol–Gasoline Dual Injection System

Optimization of fuel injection in GDI engine using economic order quantity and Lambert W function

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