Effects of Ignition Timing on CAI Combustion in a Multi-Cylinder DI Gasoline Engine

Kalian, Navin; Standing, Richard; Zhao, Hua

doi:10.4271/2005-01-3720

Cited by 8 publications

(3 citation statements)

References 22 publications

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“…Further, recent work by Lavoie et al [27] and by Wijesinghe and Hong [19] indicates that SA HCCI can also play a role in controlling heat release rates at moderate and high load conditions. Studies have examined the sensitivity of SA HCCI engine performance to some spark properties, such as the spark discharge current and voltage [17,23] and spark timing [1,9,14,22], and to engine operating parameters, such as fuel/air equivalence ratio [4], multi-stage fuel injection strategies [7,20], mixture stratification [7,18,23], and swirl [13]. These studies show variability on the magnitude of the effect of spark assist on ignition and combustion behaviour.…”

Section: Introductionmentioning

confidence: 99%

An experimental investigation of the sensitivity of the ignition and combustion properties of a single-cylinder research engine to spark-assisted HCCI

Zigler

Keros

Helleberg

et al. 2011

International Journal of Engine Research

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Spark-assisted homogeneous charge compression ignition (HCCI) combustion may be a method to improve the operation of HCCI engines. In the current study, the impact of spark assist on the fundamental properties of ignition and combustion was investigated in a single cylinder, optically-accessible research engine. Early port fuel injection and air preheating were used with indolene fuel in the study. The effects of a range of air preheat (T in = 256–281 °C), fuel/air equivalence ratio (ϕ = 0.38–0.62) and spark assist timing (10°−90° before top dead centre) conditions on maximum in-cylinder pressure and timing, cycle variability, indicated mean effective pressure (IMEP) and heat release rate were investigated. Additionally, high-speed imaging was used to capture the piston-view ignition and combustion events during spark-assisted and unassisted HCCI operation. Methods were developed and applied to the imaging sequences to quantify the physical characteristics (e.g. location of autoignition sites) and the rate of propagation of the reaction fronts formed during spark-assisted and unassisted HCCI operation. The imaging data show that autoignition sites appear with increasing frequency as air preheat temperature is increased. The addition of spark assist led to the formation of reaction fronts at all conditions that propagated outward from the spark electrode at average speeds between 1.9 and 4.3 m/s. The imaging data indicate the effects of spark assist are due to compression heating of the unburned gases by the propagating reaction fronts which also leads to more consistent location of autoignition. Comparison of the imaging and engine data show the initial formation of the reaction fronts are not significant sources of heat release. While the engine data show that spark assist can affect phasing, heat release rate, IMEP and engine stability at the marginal HCCI operating conditions studied, the results also indicate spark assist has a narrow temperature range where the changes will be significant compared to the effects of the inherent thermal stratification of the HCCI fuel/air charge.

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Section: Introductionmentioning

confidence: 99%

An experimental investigation of the sensitivity of the ignition and combustion properties of a single-cylinder research engine to spark-assisted HCCI

Zigler

Keros

Helleberg

et al. 2011

International Journal of Engine Research

View full text Add to dashboard Cite

show abstract

“…SACI is an intermediary concept involving flame improvement initiated via spark discharge, accompanied by HCCI kinetic combustion. A spark discharge has been added to improve combustion stability in terms of the IMEP [221]. The combustion properties of HCCI, SACI, and SI mode were contrasted by Wang et al [222].…”

Section: Spark-assisted Compression Ignitionmentioning

confidence: 99%

Improving Thermal Efficiency of Internal Combustion Engines: Recent Progress and Remaining Challenges

2022

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Improving thermal efficiency and reducing carbon emissions are the permanent themes for internal combustion (IC) engines. In the past decades, various advanced strategies have been proposed to achieve higher efficiency and cleaner combustion with the increasingly stringent fuel economy and emission regulations. This article reviews the recent progress in the improvement of thermal efficiency of IC engines and provides a comprehensive summary of the latest research on thermal efficiency from aspects of thermodynamic cycles, gas exchange systems, advanced combustion strategies, and thermal and energy management. Meanwhile, the remaining challenges in different modules are also discussed. It shows that with the development of advanced technologies, it is highly positive to achieve 55% and even over 60% in effective thermal efficiency for IC engines. However, different technologies such as hybrid thermal cycles, variable intake systems, extreme condition combustion (manifesting low temperature, high pressure, and lean burning), and effective thermal and energy management are suggested to be closely integrated into the whole powertrains with highly developed electrification and intelligence.

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“…The operating range of the engine is, however, limited and transient control is more challeng ing compared to more traditional combustion concepts [3]. The focus here is on spark-assisted compression ignition (SACI) com bustion, where the HCCI is augmented with spark ignition, which has been shown to increase the load range and increase the control authority over the combustion phasing [4][5][6][7]. Spark-assisted com pression ignition can also serve as a way of transitioning between HCCI and spark ignition (SI) combustion [8,9].…”

Section: Introductionmentioning

confidence: 99%

A Linear Least-Squares Algorithm for Double-Wiebe Functions Applied to Spark-Assisted Compression Ignition

Hellström

Stefanopoulou

Jiang

2014

Journal of Engineering for Gas Turbines and Power

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An algorithm for determining the four tuning parameters in a double-Wiebe description o f the combustion process in spark-assisted compression ignition engines is presented where the novelty is that the tuning problem is posed as a weighted linear least-squares problem . The approach is applied and shown to describe well an extensive data set from a light-duty gasoline engine for various engine speeds and loads. Correlations are sug gested for the four parameters based on the results, which illustrates how the doubleWiebe approach can also be utilized in a predictive simulation. The effectiveness of the methodology is quantified by the accuracy for describing and predicting the heat release rate and predicting the cylinder pressure. The root-mean square errors between the measured and predicted cylinder pressures are Ibar or less, which corresponds to 2% or less o f the peak cylinder pressure.

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Effects of Ignition Timing on CAI Combustion in a Multi-Cylinder DI Gasoline Engine

Cited by 8 publications

References 22 publications

An experimental investigation of the sensitivity of the ignition and combustion properties of a single-cylinder research engine to spark-assisted HCCI

An experimental investigation of the sensitivity of the ignition and combustion properties of a single-cylinder research engine to spark-assisted HCCI

Improving Thermal Efficiency of Internal Combustion Engines: Recent Progress and Remaining Challenges

A Linear Least-Squares Algorithm for Double-Wiebe Functions Applied to Spark-Assisted Compression Ignition

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