Download or read book Modeling the Novel Jones Engine Toroidal Concept in Homogeneous Charge Compression Ignition HCCI and Spark Ignition SI Combustion Model written by and published by . This book was released on 2020 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: The need for reduced CO2 emissions from transportation and stationary power generation applications has driven engine designers, developers, and researchers to seek new and novel technologies and designs to maximize engine efficiency, reduce weight, and increase engine performance. One such new engine design was proposed by Jones Engine LLC, and called the Jones Engine. The Jones Engine concept utilizes a novel toroidal piston/cylinder configuration, eliminating the connecting rod of the traditional slider-crank mechanism, thereby allowing for a more direct transfer of work from the combustion gases to the crankshaft. Jones Engine LLC promises significantly increase output torque, reduced fuel economy, and decreased engine weight through its unique design. This work seeks to model the Jones Engine's unique engine cycle, and directly compare to analogous conventional reciprocating slider-crank engines to provide an assessment of the benefits and limitations of the Jones Engine concept. In this work, the Jones Engine concept was modeled via a MATLAB based 0-D engine simulation code developed by the authors, utilizing Cantera to solve the gas phase chemical kinetics. The engine was modeled in two combustion modes, Homogeneous Charge Compession Ignition (HCCI), and Spark-Ignited (SI). The HCCI combustion model utilized a homogeneous single-zone incorporating the effects of piston motion, heat transfer, and gas phase kinetics, while the SI combustion model utilized a 2-zone modeling approach with either a prescribed Wiebe function heat release, or a semi-predictive flame propagation model. The engine models were validated against experimental data from conventional engines available in the literature. The results of the simulations showed that at identical engine operating conditions and analogous geometrics, the Jones offered slightly reduced efficiency in HCCI and SI combustion modes, but with significantly higher output torque due to the nature of the Jones Engine mechanism. However, the simulation results indicated several potential benefits of the Jones Engine configuration, including increased knock mitigatation in SI mode, and therefore the ability to operate with significantly higher geometric compression ratios, thereby offering higher efficiency potential.

Download or read book Inflation Kaufkraft Wechselkurs written by and published by . This book was released on 1986 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Modelling the Combustion in a Dual Fuel HCCI Engine written by Hossein Ghomashi and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Modelling the Combustion in a Duel Fuel HCCI Engine written by Hossein Ghomashi and published by . This book was released on 2013 with total page 205 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Modeling Combustion in Compression Ignition Homogeneous Charge Engines written by Song-Charng Kong and published by . This book was released on 1992 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Multi dimensional Modeling of Ignition and Combustion in Premixed and DIS CI direct Injection Spark compression Ignition Engines written by Zhichao Tan and published by . This book was released on 2003 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Combustion in Homogeneous Charge Compression Ignition Engines written by Daniel Lee Flowers and published by . This book was released on 2001 with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Homogeneous Charge Compression Ignition HCCI written by and published by . This book was released on 1997 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Modeling and Control of Homogeneous Charge Compression Ignition Engines with High Dilution written by Chia-Jui Chiang and published by . This book was released on 2006 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Design of a Research Engine for Homogeneous Charge Compression Ignition HCCI Combustion written by Philip S. Zoldak and published by . This book was released on 2005 with total page 490 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Homogeneous Charge Compression Ignition HCCI Combustion written by Society of Automotive Engineers and published by . This book was released on 2001 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Analysis of Homogeneous Charge Compression Ignition Engine with Emphasis on Combustion Timing and Reaction Rate written by Arunim Bhattacharya and published by . This book was released on 2017 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt: HCCI engines are a class of engines which use high compression ratio to ignite a charge of air-fuel mixture, essentially eliminating the need for spark plugs. This contrasts with diesel engines (although HCCI can be used for diesel engines) where the fuel is injected near the top dead center of the compression stroke regime. Gasoline HCCI engines are of significance because, it attempts to improve the characteristics of the engine for example the thermal efficiency. High compression ratio comes with higher thermal efficiency, yet the peak temperature remains low enough to have low production rates of harmful oxides of nitrogen and formation of soot. However, there are certain challenges associated with such type of engine, one of which and perhaps the most important of all is how to control the combustion rate. Flow dynamics and chemical-kinetics analysis, is essential to predict combustion timing, duration, and rate. The objective of this study is to analyze a HCCI engine using, simulation analysis models including a three-dimensional CFD simulation model. Simulation analysis is carried out using a generic HCCI engine, initially with simplified chemical kinetics, and then using detailed chemical kinetics and using RANS turbulence CFD model. A sensitivity analysis of the effect of RPM on the combustion time, burn duration, heat release, efficiency and emission concentration are carried out.

Download or read book CFX5 Simulation of a Homogeneous Charge Compression Ignition HCCI Engine written by Haijun Zheng and published by . This book was released on 2005 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Homogeneous Charge Compression Ignition HCCI written by and published by . This book was released on 2004 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Flex Fuel Optimized SI and HCCI Engine written by and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The central objective of the proposed work is to demonstrate an HCCI (homogeneous charge compression ignition) capable SI (spark ignited) engine that is capable of fast and smooth mode transition between SI and HCCI combustion modes. The model-based control technique was used to develop and validate the proposed control strategy for the fast and smooth combustion mode transition based upon the developed control-oriented engine; and an HCCI capable SI engine was designed and constructed using production ready two-step valve-train with electrical variable valve timing actuating system. Finally, smooth combustion mode transition was demonstrated on a metal engine within eight engine cycles. The Chrysler turbocharged 2.0L I4 direct injection engine was selected as the base engine for the project and the engine was modified to fit the two-step valve with electrical variable valve timing actuating system. To develop the model-based control strategy for stable HCCI combustion and smooth combustion mode transition between SI and HCCI combustion, a control-oriented real-time engine model was developed and implemented into the MSU HIL (hardware-in-the-loop) simulation environment. The developed model was used to study the engine actuating system requirement for the smooth and fast combustion mode transition and to develop the proposed mode transition control strategy. Finally, a single cylinder optical engine was designed and fabricated for studying the HCCI combustion characteristics. Optical engine combustion tests were conducted in both SI and HCCI combustion modes and the test results were used to calibrate the developed control-oriented engine model. Intensive GT-Power simulations were conducted to determine the optimal valve lift (high and low) and the cam phasing range. Delphi was selected to be the supplier for the two-step valve-train and Denso to be the electrical variable valve timing system supplier. A test bench was constructed to develop control strategies for the electrical variable valve timing (VVT) actuating system and satisfactory electrical VVT responses were obtained. Target engine control system was designed and fabricated at MSU for both single-cylinder optical and multi-cylinder metal engines. Finally, the developed control-oriented engine model was successfully implemented into the HIL simulation environment. The Chrysler 2.0L I4 DI engine was modified to fit the two-step vale with electrical variable valve timing actuating system. A used prototype engine was used as the base engine and the cylinder head was modified for the two-step valve with electrical VVT actuating system. Engine validation tests indicated that cylinder #3 has very high blow-by and it cannot be reduced with new pistons and rings. Due to the time constraint, it was decided to convert the four-cylinder engine into a single cylinder engine by blocking both intake and exhaust ports of the unused cylinders. The model-based combustion mode transition control algorithm was developed in the MSU HIL simulation environment and the Simulink based control strategy was implemented into the target engine controller. With both single-cylinder metal engine and control strategy ready, stable HCCI combustion was achived with COV of 2.1% Motoring tests were conducted to validate the actuator transient operations including valve lift, electrical variable valve timing, electronic throttle, multiple spark and injection controls. After the actuator operations were confirmed, 15-cycle smooth combustion mode transition from SI to HCCI combustion was achieved; and fast 8-cycle smooth combustion mode transition followed. With a fast electrical variable valve timing actuator, the number of engine cycles required for mode transition can be reduced down to five. It was also found that the combustion mode transition is sensitive to the charge air and engine coolant temperatures and regulating the corresponding temperatures to the target levels during the combustion mode transition is the key for a smooth combustion mode transition. As a summary, the proposed combustion mode transition strategy using the hybrid combustion mode that starts with the SI combustion and ends with the HCCI combustion was experimentally validated on a metal engine. The proposed model-based control approach made it possible to complete the SI-HCCI combustion mode transition within eight engine cycles utilizing the well controlled hybrid combustion mode. Without intensive control-oriented engine modeling and HIL simulation study of using the hybrid combustion mode during the mode transition, it would be impossible to validate the proposed combustion mode transition strategy in a very short period.

Download or read book SI to HCCI Operation of a Small Macro scale 4 stroke Engine written by Peter Lynn Therkelsen and published by . This book was released on 2009 with total page 139 pages. Available in PDF, EPUB and Kindle. Book excerpt: Homogeneous Charge Compression Ignition (HCCI) combustion is different from conventional Spark Ignition (SI) combustion in a gasoline engine and Compression Ignition (CI) diffusion combustion in a diesel engine. The combination of a diluted and premixed fuel and air mixture with multiple ignition sites throughout the combustion chamber eliminates the high combustion temperature zones and prevents the production of soot particles, hence ultra-low NOx and particulate emissions. HCCI engines are characterized by higher efficiency than traditional SI and CI engines. Excluding the MEMS scale, HCCI research has focused on engine sizes used in modern passenger vehicles or lightweight trucks. Engines studied range in displacement volumes from 0.447 to 14.5 L. Use of HCCI combustion in smaller personal transportation sized engines has only been theorized. The effects of scale on SI and CI engine performance has been well documented and are typified with changes to operational ranges and efficiency. The focus of this research is to determine the effects of engine size reduction on HCCI combustion in a four-stroke engine. The operability of a small scale HCCI engine was first examined using a traditional large scale HCCI engine computer model. The model both indicated that small scale HCCI operation is achievable and outlined experimental requirements to achieve successful engine operation. A 25 cc SI engine was modified and used to explore the operability of HCCI in a small scale engine. Initial experimental tests attempting to start the small engine in HCCI mode with engine inlet heating were not successful. These tests, based upon modeling results, did not produce an operable small scale HCCI engine. Studies of the heat transfer characteristics of a small engine with high surface area to volume ratio were performed. These studies indicated that all engine inlet heating was lost from the engine before the energy could be employed in initiating auto-ignition of the fuel and air. Preheating of the engine by operating in SI mode then transitioning to HCCI operation resulted in sustainable small scale HCCI. Small macro-scale HCCI operability was characterized with respect to operational parameters. Performance characteristics were compared within the HCCI operational window and to the SI engine. The performance of the small macro-scale HCCI engine is far worse than that of large macro-scale HCCI engines. Future work focusing on proper thermal management as well as SI to HCCI transitioning is recommended.

Download or read book Homogeneous charge Compression ignition HCCI Engines written by R. H. Thring and published by . This book was released on 1989 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: