scholarly journals Homogeneous Charge Compression Ignition Combustion: Challenges and Proposed Solutions

2013 ◽  
Vol 2013 ◽  
pp. 1-14 ◽  
Author(s):  
Mohammad Izadi Najafabadi ◽  
Nuraini Abdul Aziz
Keyword(s):  
Homogeneous Charge Compression Ignition ◽  
Fuel Efficiency ◽  
Operating Conditions ◽  
Future Research ◽  
Compression Ignition ◽  
Ignition Timing ◽  
Ic Engine ◽  
Hcci Engine ◽  
Wide Range ◽  
Homogeneous Charge

Engine and car manufacturers are experiencing the demand concerning fuel efficiency and low emissions from both consumers and governments. Homogeneous charge compression ignition (HCCI) is an alternative combustion technology that is cleaner and more efficient than the other types of combustion. Although the thermal efficiency andNOxemission of HCCI engine are greater in comparison with traditional engines, HCCI combustion has several main difficulties such as controlling of ignition timing, limited power output, and weak cold-start capability. In this study a literature review on HCCI engine has been performed and HCCI challenges and proposed solutions have been investigated from the point view ofIgnition Timingthat is the main problem of this engine. HCCI challenges are investigated by many IC engine researchers during the last decade, but practical solutions have not been presented for a fully HCCI engine. Some of the solutions are slow response time and some of them are technically difficult to implement. So it seems that fully HCCI engine needs more investigation to meet its mass-production and the future research and application should be considered as part of an effort to achieve low-temperature combustion in a wide range of operating conditions in an IC engine.

Sensitivity Analysis of Combustion Timing of Homogeneous Charge Compression Ignition Gasoline Engines

2008 ◽  
Vol 131 (1) ◽  
Author(s):  
Chia-Jui Chiang ◽  
Anna G. Stefanopoulou
Keyword(s):  
Sensitivity Analysis ◽  
Homogeneous Charge Compression Ignition ◽  
Quantitative Information ◽  
Operating Conditions ◽  
Dominant Factor ◽  
Compression Ignition ◽  
Hcci Engine ◽  
Wide Range ◽  
Start Of Combustion ◽  
Homogeneous Charge

The goal of this paper is to identify the dominant factors that should be included in a control oriented model in order to predict the start of combustion in a homogeneous charge compression ignition (HCCI) engine. Qualitative and quantitative information on the individual effects of fuel and exhaust gas recirculation on the HCCI combustion is provided. Using sensitivity analysis around a wide range of operating conditions of a single-cylinder port-injection gasoline HCCI engine, we find that temperature is the dominant factor in determining the start of combustion. Charge temperature thus becomes the “spark” in a HCCI engine. Therefore, a model without the composition terms should be adequate for model based regulation of the combustion timing in a port-injection gasoline HCCI engine with high dilution from the exhaust.

Spark Plug Modifications for Improving Ion Sensing Capabilities in a Homogeneous Charge Compression Ignition (HCCI) Engine

2009 ◽  
Author(s):  
Gregory Bogin ◽  
J. Hunter Mack ◽  
Robert W. Dibble
Keyword(s):  
Homogeneous Charge Compression Ignition ◽  
Low Cost ◽  
Operating Conditions ◽  
Compression Ignition ◽  
Ion Detection ◽  
Hcci Engine ◽  
Spark Plug ◽  
Wide Range ◽  
Hcci Engines ◽  
Homogeneous Charge

Ion sensors have shown great potential as a low-cost diagnostic tool for detecting the start of combustion (SOC) in Homogeneous Charge Compression Ignition (HCCI) engines. Ion detection in an HCCI engine depends on both the combustion event as well as the type of probe used. Optimization of the shape and size of spark plug electrodes is experimentally examined in order to improve the overall quality of the ion signal for a wide range of engine operating conditions. Idling conditions for an HCCI engine are typically lean with equivalence ratios φ ≤ 0.25, which leads to reduced peak combustion temperatures. The ion signal in HCCI engines decreases exponentially with reduced combustion temperatures. Experiments are conducted on a 1.9L 4-cylinder VW TDI diesel engine (converted to run in HCCI mode) using four modified spark plugs to understand ion detection over various equivalence ratios and operating conditions. Increasing the surface area of the positive center electrode (using a positive bias voltage) provided a significant improvement in the peak ion signal.

Combustion and emission characteristics of a homogeneous charge compression ignition engine

2005 ◽  
Vol 219 (9) ◽  
pp. 1133-1139 ◽  
Author(s):  
Hu Tiegang ◽  
Liu Shenghua ◽  
Zhou Longbao ◽  
Zhu Chi
Keyword(s):  
Heat Release ◽  
Homogeneous Charge Compression Ignition ◽  
Cetane Number ◽  
Pressure Rise ◽  
Operating Conditions ◽  
Emission Characteristics ◽  
Compression Ignition ◽  
Compression Ignition Engine ◽  
Hcci Engine ◽  
Homogeneous Charge

Dimethyl ether (DME) is a kind of fuel with high cetane number and low evaporating temperature, which is suitable for a homogeneous charge compression ignition (HCCI) engine. The combustion and emission characteristics of an HCCI engine fuelled with DME were investigated on a modified single-cylinder engine. The experimental results indicate that the HCCI engine combustion is a two-stage heat release process. The engine load or air-fuel ratio has significant effects on the maximum cylinder pressure and its position, the shape of the pressure rise rate and the heat release rate. The engine speed has little effect. A DME HCCI engine is smoke free, with zero NOx and low hydrocarbon and CO emissions under the operating conditions of 0.25–0.30 MPa brake mean effective pressure.

Modelling and Simulation of Homogeneous Charge Compression Ignition Engine Fueled by Biodiesel

2018 ◽  
Author(s):  
Meshack Hawi ◽  
Mahmoud Ahmed ◽  
Shinichi Ookawara
Keyword(s):  
Heat Release ◽  
Compression Ratio ◽  
Homogeneous Charge Compression Ignition ◽  
Internal Combustion ◽  
Operating Conditions ◽  
Emission Characteristics ◽  
Compression Ignition ◽  
Hcci Engine ◽  
Hcci Engines ◽  
Homogeneous Charge

Homogeneous charge compression ignition (HCCI) is a combustion technology which has received increased attention of researchers in the combustion field for its potential in achieving low oxides of nitrogen (NOx) and soot emission in internal combustion (IC) engines. HCCI engines have advantages of higher thermal efficiency and reduced emissions in comparison to conventional internal combustion engines. In HCCI engines, ignition is controlled by the chemical kinetics, which leads to significant variation in ignition time with changes in the operating conditions. This variation limits the practical range of operation of the engine. Additionally, since HCCI engine operation combines the operating principles of both spark ignition (SI) and compression ignition (CI) engines, HCCI engine parameters such as compression ratio and injection timing may vary significantly depending on operating conditions, including the type of fuel used. As such, considerable research efforts have been focused on establishing optimal conditions for HCCI operation with both conventional and alternative fuels. In this study, numerical simulation is used to investigate the effect of compression ratio on combustion and emission characteristics of an HCCI engine fueled by pure biodiesel. Using a zero-dimensional (0-D) reactor model and a detailed reaction mechanism for biodiesel, the influence of compression ratio on the combustion and emission characteristics are studied in Chemkin-Pro. Simulation results are validated with available experimental data in terms of incylinder pressure and heat release rate to demonstrate the accuracy of the simulation model in predicting the performance of the actual engine. Analysis shows that an increase in compression ratio leads to advanced and higher peak incylinder pressure. The results also reveal that an increase in compression ratio produces advanced ignition and increased heat release rates for biodiesel combustion. Emission of NOx is observed to increase with increase in compression ratio while the effect of compression ratio on emissions of CO, CO2 and unburned hydrocarbon (UHC) is only marginal.

scholarly journals Characterisation of the combustion process in the spark ignition and homogeneous charge compression ignition engine

2018 ◽  
Vol 22 (5) ◽  
pp. 2025-2037
Author(s):  
Ante Vucetic ◽  
Mladen Bozic ◽  
Darko Kozarac ◽  
Zoran Lulic
Keyword(s):  
Homogeneous Charge Compression Ignition ◽  
Spark Ignition ◽  
Operating Conditions ◽  
Compression Ignition ◽  
Combustion Mode ◽  
Hcci Engine ◽  
Combustion Modes ◽  
Mode Of Operation ◽  
Start Of Combustion ◽  
Homogeneous Charge

Homogeneous charge compression ignition (HCCI) engine is a potential solution for reducing air pollution and for satisfying legal limits regarding the emissions from internal combustion engines. The HCCI engines have advantages of lower emissions of NOx and particulate matter, compared to the standard combustion modes, while on the other hand one of the major disadvantages is the difficulty of control of start of combustion, since the start of combustion is highly sensitive to the intake air temperature. Additional advantage of the HCCI engine is the ability to operate with wide range of fuels. In order to demonstrate this potential in this study the HCCI mode of operation is compared to the spark ignition mode of operation. The study aims to compare and characterise two different combustion modes on the same engine with different CR and different fuels at similar operating conditions. For that purpose the engine tests are performed at the same indicated mean effective pressures for the spark ignition and HCCI combustion mode at the same engine speed, while the tests are performed at three different engine speeds and three different loads. The measurements were performed on the experimental set-up that consists of single cylinder Diesel engine modified to enable operation in spark ignition and HCCI modes. The characterisation includes the comparison of in-cylinder pressure, temperature and rate of heat release obtained by spark ignition and homogeneous charge compression ignition combustion mode and presents comparisons of engine efficiencies and of emissions of HC, CO, and NOx.

scholarly journals The research and analysis of Homogeneous Charge Compression Ignition Engine

2021 ◽  
Vol 2125 (1) ◽  
pp. 012016
Author(s):  
Binzhi Sun ◽  
Hexu Wang ◽  
Keming Yan ◽  
Renyi Zhang
Keyword(s):  
Mass Production ◽  
Homogeneous Charge Compression Ignition ◽  
Fuel Efficiency ◽  
Compression Ignition ◽  
Ignition Timing ◽  
Compression Ignition Engine ◽  
Gasoline Engines ◽  
Combustion Technology ◽  
Homogeneous Charge

Abstract HCCI represents homogeneous charge compression ignition. It is a cleaner, higher thermal efficiency, and higher fuel efficiency alternative combustion technology. This engine combines the advantages of diesel and gasoline engines so that the compression ratio of diesel engines can be achieved even when gasoline is used as fuel, and there is basically no NOx and soot emissions. However, the HCCI still has some problems such as ignition timing unstable, bad load and speed variation, and cold start capacity. Today, due to the above shortcomings, HCCI is still mainly researched and developed in the laboratory without mass production. The purpose of this paper is discussing the advantage and disadvantage of HCCI technique and analyse the operating principle to provide possible solution that will improve the quality of HCCI engine before the mass production of HCCI.

scholarly journals Thermodynamic model for homogeneous charge compression ignition combustion with recompression valve events and direct injection: Part II—Combustion model and evaluation against transient experiments

2016 ◽  
Vol 18 (7) ◽  
pp. 677-700
Author(s):  
Prasad S Shingne ◽  
Jeff Sterniak ◽  
Dennis N Assanis ◽  
Claus Borgnakke ◽  
Jason B Martz
Keyword(s):  
Homogeneous Charge Compression Ignition ◽  
Direct Injection ◽  
Combustion Process ◽  
Operating Conditions ◽  
Combustion Model ◽  
Compression Ignition ◽  
Ignition Timing ◽  
Ignition And Combustion ◽  
Compression Ignition Combustion ◽  
Homogeneous Charge

This two-part article presents a combustion model for boosted and moderately stratified homogeneous charge compression ignition combustion for use in thermodynamic engine cycle simulations. The model consists of two parts: one an ignition model for the prediction of auto-ignition onset and the other an empirical combustion rate model. This article focuses on the development of the combustion model which is algebraic in form and is based on the key physical variables affecting the combustion process. The model is fit with experimental data collected from 290 discrete automotive homogeneous charge compression ignition operating conditions with moderate stratification resulting from both the direct injection and negative valve overlap valve events. Both the ignition model from part 1 and the combustion model from this article are implemented in GT-Power and validated against experimental homogeneous charge compression ignition data under steady-state and transient conditions. The ignition and combustion model are then exercised to identify the dominant variables affecting the homogeneous charge compression ignition and combustion processes. Sensitivity analysis reveals that ignition timing is primarily a function of the charge temperature, and that combustion duration is largely a function of ignition timing.

Expanding the operating range of homogeneous charge compression ignition-spark ignition dual-mode engines in the homogeneous charge compression ignition mode

2005 ◽  
Vol 6 (4) ◽  
pp. 279-288 ◽  
Author(s):  
J Yang
Keyword(s):  
Thermal Energy ◽  
Homogeneous Charge Compression Ignition ◽  
Combustion Efficiency ◽  
Operating Conditions ◽  
Compression Ignition ◽  
Hcci Engine ◽  
Alternative Approaches ◽  
Economy Benefit ◽  
Operating Regimes ◽  
Homogeneous Charge

Vehicle fuel economy benefit through the use of homogeneous charge compression ignition (HCCI) engine technology depends on the range of HCCI operating conditions. The range of HCCI operating conditions also determines the frequency of combustion mode transition over vehicle drive cycles. Based on test data in a single-cylinder HCCI engine, the constraints on HCCI operating regimes were analysed, including combustion roughness and knock, combustion timing control, breathing, thermal energy for mixture autoignition, and combustion efficiency. The constraints due to inadequate thermal energy and insufficient breathing depend on the HCCI approaches employed. The operating ranges of alternative approaches to HCCI systems are quite different. For the other constraints, conventional control methods were tested and analysed to expand the range of HCCI operating conditions to higher loads, and to improve combustion efficiency at light loads.

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