Closed-Loop Control of an HCCI Engine

Olsson, Jan-Ola; Tunestål, Per; Johansson, Bengt

doi:10.4271/2001-01-1031

Cited by 234 publications

(120 citation statements)

References 12 publications

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“…Figure 1 shows a schematic of the engine system. Basically the same engine setup has been used in previous papers by the authors [25,26,28]. The main difference is the EGR system and the arrangement of heaters and CAC.…”

Section: Experimental Apparatusmentioning

confidence: 99%

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The Effect of Cooled EGR on Emissions and Performance of a Turbocharged HCCI Engine

Olsson¹,

Tunestål²,

Ulfvik³

et al. 2003

SAE Technical Paper Series

Self Cite

105

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This paper discusses the effects of cooled EGR on a turbo charged multi cylinder HCCI engine. A six cylinder, 12 liter, Scania D12 truck engine is modified for HCCI operation. It is fitted with port fuel injection of ethanol and n-heptane and cylinder pressure sensors for closed loop combustion control. The effects of EGR are studied in different operating regimes of the engine. During idle, low speed and no load, the focus is on the effects on combustion efficiency, emissions of unburned hydrocarbons and CO. At intermediate load, run without turbocharging to achieve a well defined experiment, combustion efficiency and emissions from incomplete combustion are still of interest. However the effect on NO X and the thermodynamic effect on thermal efficiency, from a different gas composition, are studied as well. At high load and boost pressure the main focus is NO X emissions and the ability to run high mean effective pressure without exceeding the physical constraints of the engine. In this case the effects of EGR on boost and combustion duration and phasing are of primary interest. It is shown that CO, HC and NO X emissions in most cases all improve with EGR compared to lean burn. Combustion efficiency, which is computed based on exhaust gas analysis, increases with EGR due to lower emissions of CO and HC.

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Section: Experimental Apparatusmentioning

confidence: 99%

“…In earlier studies with the same engine, [25,26,28], combinations of n-heptane and gasoline or isooctane, have been used. In this study, combinations of n-heptane and ethanol are used because of the high octane rating of ethanol.…”

Section: Experimental Apparatusmentioning

confidence: 99%

The Effect of Cooled EGR on Emissions and Performance of a Turbocharged HCCI Engine

Olsson¹,

Tunestål²,

Ulfvik³

et al. 2003

SAE Technical Paper Series

Self Cite

105

View full text Add to dashboard Cite

show abstract

“…Currently, there is a lot of interest in using iso-octane as a fuel in investigations of homogeneous charge compression ignition engines (HCCI), in which iso-octane is used both as a neat fuel and as a component in a primary reference fuel blend [1][2][3][4]. This interest is motivated by the need to improve the efficiency and performance of currently operating combustors and reduce the production of pollutant species emissions generated in the combustion process.…”

Section: Introductionmentioning

confidence: 99%

A comprehensive modeling study of iso-octane oxidation

Curran

2002

Combustion and Flame

1,234

722

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A detailed chemical kinetic mechanism has been developed and used to study the oxidation of iso-octane in a jet-stirred reactor, flow reactors, shock tubes and in a motored engine. Over the series of experiments investigated, the initial pressure ranged from 1 to 45 atm, the temperature from 550 K to 1700 K, the equivalence ratio from 0.3 to 1.5, with nitrogen-argon dilution from 70% to 99%. This range of physical conditions, together with the measurements of ignition delay time and concentrations, provide a broad-ranging test of the chemical kinetic mechanism. This mechanism was based on our previous modeling of alkane combustion and, in particular, on our study of the oxidation of n-heptane. Experimental results of ignition behind reflected shock waves were used to develop and validate the predictive capability of the reaction mechanism at both low and high temperatures. Moreover, species' concentrations from flow reactors and a jet-stirred reactor were used to help complement and refine the low and intermediate temperature portions of the reaction mechanism, leading to good predictions of intermediate products in most cases. In addition, a sensitivity analysis was performed for each of the combustion environments in an attempt to identify the most important reactions under the relevant conditions of study.

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“…at piston top-dead-centre (TDC) when the engine is operating optimally. Yet, changes in engine air charge temperature and pressure, or variations in engine load and speed, require the chemical kinetics to be controllable, in order to achieve ignition around TDC under all conditions [3]. One way to ensure that ignition takes place around TDC at varying engine operating conditions is to control the ignition quality of the fuel.…”

Section: Introductionmentioning

confidence: 99%

1-hexene autoignition control by prior reaction with ozone

Schönborn

Hellier

Ladommatos

et al. 2016

Fuel Processing Technology

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The autoignition timing of 1-hexene was controlled in a Homogeneous Charge Compression Ignition (HCCI) engine by reacting the fuel with ozone-containing air prior to its combustion. The experiments were conducted in a single cylinder research engine instrumented with a cylinder pressure sensor. The fuel was chemically characterised using Nuclear Magnetic Resonance (NMR) spectroscopy before and after its reaction with ozone. The NMR analyses showed that this preliminary reaction produced several oxygenated products within the fuel, and was likely to have resulted in the formation of ozonide molecules having a peroxidic structure with several oxygen molecules in series. To understand how this would affect the ignition reactions, the ignition process was modelled numerically using a single-zone chemical kinetic reactor model. The modelling suggested that peroxide molecules decomposed during the compression of the reactants in the engine and advanced ignition timing by promoting early decomposition of the fuel through the formation of radicals.

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Closed-Loop Control of an HCCI Engine

Cited by 234 publications

References 12 publications

The Effect of Cooled EGR on Emissions and Performance of a Turbocharged HCCI Engine

The Effect of Cooled EGR on Emissions and Performance of a Turbocharged HCCI Engine

A comprehensive modeling study of iso-octane oxidation

1-hexene autoignition control by prior reaction with ozone

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