The use of hydrogen in port fuel injection (PFI) engines faces challenges related to abnormal combustions that must be addressed, especially in transient operation. The in-cylinder air-to-fuel ratio and the amount of trapped exhaust gas have a significant impact on the probability of abnormal combustion as well as NOx emissions, and should be real-time monitored in hydrogen engines. Thus, the real-time estimation of the composition and thermodynamic state of the trapped gas mixture is crucial during transient operations, although highly challenging. This study proposes an on-line real-time physics-based MIMO (Multi-Input-Multi-Output) model to accurately estimate the amount of trapped air and exhaust gas in the cylinder at the intake valve closing (IVC) event, based on the instantaneous in-cylinder pressure measurement. With proper estimation accuracy, the injector can be controlled to correctly provide the amount of fuel necessary to achieve the target air-to-fuel ratio (AFR) and

Galli, Claudio, Ciampolini, Marco, Drovandi, Lorenzo, Romani, Luca, Balduzzi, Francesco, Ferrara, Giovanni, Vichi, Giovanni, Minamino, Ryota

DoE-Based Numerical Optimization of Intake and Exhaust Port Geometry of a Small Opposed-Piston 2-Stroke (OP2S) Hydrogen Engine

2024-32-0054

04/18/2025

The future potential of an opposed-piston two-stroke (OP2S) engine has attracted the attention of researchers worldwide as it offers a high thermal efficiency and power-to-weight ratio with a simple engine configuration. This engine can be used with low-carbon fuels and hydrogen to reduce greenhouse gas emissions. However, the two-stroke operation has always been limited by its low scavenging efficiency and short-circuit of fresh charge. The current work is focused on optimizing scavenging efficiency and short-circuit in a small 200 cc single-cylinder OP2S SI engine using 3-D computational fluid dynamic (CFD) simulations. The effect of four parameters, namely, area of intake ports, area of exhaust ports, and angular orientations of intake ports (swirl and tilt) on scavenging efficiency and short-circuit, has been assessed and optimized. A Latin-hypercube based Design of Experiments (DoE) methodology is used to sample the design space spanning over a range of four parameters. A response

Singh, Saurabh, Boggavarapu, Prasad, Himabindu, M., Ravikrishna, R.V.

Experimental Investigations of a Hydrogen Fueled Natural Gas Engine and Ion Current Measurement for Combustion Diagnostics in Pure Hydrogen Operationwith Water Injection

2024-32-0065

04/18/2025

In the ongoing effort to decarbonize energy supply, a notable shift involves the conversion or retrofitting of combined heat and power plants to operate on hydrogen as an alternative to natural gas. In this transformative landscape, extensive research is underway to develop and explore innovative combustion processes for hydrogen-fueled engines, aiming to comprehend and optimize combustion processes concerning both engine performance and emissions. Among the various methods available for monitoring the combustion process and engine control, ion current sensing presents itself as a viable option. A unique feature of this research lies in utilizing the engine's spark plug itself as an electrical sensor, measuring the ion current generated during the flame development and combustion processes. Given the limited research on ion current sensing for hydrogen combustion processes, a series of experiments were conducted and presented in this work. These experiments involved sweeps of water-to

Salim, Naqib, Beltaifa, Youssef, Kettner, Maurice, Loose, Oliver, Weißgerber, Tycho

Research on the Combustion Characteristics of Port Injection Hydrogen Engines for Motorcycles

2024-32-0094

04/18/2025

To prevent global warming, reducing CO2 emissions is the most important issue, and for this reason, efforts are needed to realize a carbon neutral society. Since hydrogen can be stored and transported, and does not emit carbon dioxide when burned, it has attracted particular attention as a fuel for internal combustion engines in recent years and has been studied in various industrial fields[1]. However, many of these studies have been conducted on commercial and passenger vehicle engines, and there has not yet been sufficient validation on small motorcycle engines. Therefore, in this study, a single cylinder gasoline engine for two-wheeled vehicles was converted into a hydrogen engine with port injection, and the abnormal combustion, which is a problem of hydrogen combustion, was verified. In this report, the parameters affecting the abnormal combustion are summarized based on the experimental results, and the reason why the parameters are a factor of the abnormal combustion generation

Suzuki, Haruaki, Inui, Taichi, Okado, Takanori, Tamura, Shohei, Kagawa, Yuta, Ninomiya, Yoshinari

Characterization of Spark Ignition Energy Transfer at Different Phases Using Pressure-Rise Calorimetry

2025-01-8402

04/01/2025

The paper presents novel studies on the electrical-to-thermal energy deposition to gas at different phases of a spark. The experiments utilized a 10.9 milliliter custom-built spark calorimeter. The energy transfer efficiencies across spark phases—breakdown+arc, and glow are quantified, emphasizing their importances in ensuring robust ignition. An AC capacitive ignition system was considered in the experiments. The spark plugs used in the experiments were of dual-nickel standard J-gap design of a fixed electrode gap. Test results show the breakdown+arc phases are highly efficient in converting electrical to thermal energy, crucial for ignition. The glow phase, offering control flexibility, is found to be less effective in energy transfer from spark to gas. In addition, a maximum threshold for both glow current and duration is found. Exceeding the threshold reduces the net energy deposition to the gas, indicating an increase in thermal energy losses, primarily to the spark plug

Saha, Anupam, Tunestal, Per, Aengeby, Jakob, Andersson, Oivind

Effects of Injection Timing and Pressure on Combustion Performance and Emissions in Hydrogen Direct Injection Engine

2025-01-8421

04/01/2025

As the demand for cleaner and more efficient propulsion systems increases, hydrogen internal combustion engines have emerged as a promising solution due to their high thermal efficiency and zero-carbon emissions potential. Achieving ultra-lean combustion conditions (lambda > 2.8) in hydrogen engines significantly improves thermal efficiency while maintaining combustion stability and reducing knock intensity. However, hydrogen injection timing and pressure are crucial factors influencing the combustion and emission characteristics of hydrogen engines. This study investigates the effects of hydrogen injection timing and pressure on the combustion performance and emission characteristics of a direct injection hydrogen engine under different load conditions. Experimental tests were conducted on a multi-cylinder engine equipped with a hydrogen direct injection system, focusing on part-load operation to explore the interplay between injection parameters and engine performance. Results show

Du, Jiakun, Wu, Guangquan, Chen, Hong, Sun, Fanjia, Xie, Fangxi, Li, Yuhuai, Sun, Yao, Qi, Hongzhong, Li, Yong

Experimental Study of Direct-Injection Compression-Ignition Hydrogen Combustion in an Opposed-Piston Two-Stroke (OP2S) Engine

2025-01-8430

04/01/2025

The future heavy duty powertrain market is expected to be more diverse, with a gradual shift towards cleaner and more sustainable alternative fuels. Among various options, the hydrogen Internal Combustion Engine (ICE) holds the promise of significantly reducing carbon emissions while leveraging existing ICE technology. However, it also faces substantial challenges related to engine performance, fuel storage and delivery, infrastructure development, economic feasibility, safety and market acceptance. This paper focuses on performance challenges of hydrogen engine, including knock and pre-ignition, as well as low thermal efficiencies, and introduces the Opposed-Piston Two-Stroke Hydrogen ICE (OP2S-H2ICE) as a potential solution. The study demonstrates that OP2S-H2ICE can operate using direct injection, compression-ignition (CI) combustion solely with hydrogen, under various low-load to partial load conditions. Specifically, as the load increases, the combustion transitions from partial

Huo, Ming, El-Hannouny, Essam, Longman, Douglas

Performance and Emissions Analysis of a Hydrogen-Powered Heavy-Duty High Compression Ratio SI Engine Across Various Loads and Speed at Ultra-Lean Condition

2025-01-8428

04/01/2025

With the global shift towards sustainable and low-emission transportation, hydrogen-fueled engines stand out as a promising alternative to traditional fossil fuels, offering significant potential to reduce greenhouse gas emissions. This study provides a comprehensive evaluation of the performance and emissions characteristics of a hydrogen-powered heavy-duty compression ignition engine, which has been modified to operate as a Spark Ignition (SI) engine with a high compression ratio of 17:1. The evaluation was conducted across various speeds, loads, and spark timings under ultra-lean combustion conditions. The analysis utilized a modified 6-cylinder, 13-liter Volvo D13 diesel engine, configured to operate in single-cylinder mode with the addition of a spark plug for SI operation. The study examined key performance metrics, including brake thermal efficiency (BTE), power output, and specific fuel consumption, under the selected operating conditions. Emissions profiles for nitrogen oxides

Dyuisenakhmetov, Aibolat, Panithasan, Mebin Samuel, Cenker, Emre, AlRamadan, Abdullah, Im, Hong, Turner, James

Flame Extinguishing and Heat Transfer in the Combustion Chamber of a Hydrogen Engine

2025-01-8420

04/01/2025

Conversion to hydrogen of automobile internal combustion engines powered by fuels of petroleum origin is the most important direction for solving environmental, energy and climate problems of modern civilization. A number of researchers, based on experimental studies, note the presence of a phenomenon of a significant increase in heat losses in hydrogen engines compared to gasoline engines. This phenomenon is explained by an increase in temperature and speed of movement of the working fluid. In this paper, it is shown that the main reason for the increase in thermal losses is the ability of the hydrogen flame to penetrate into the narrow gap between the piston and the engine sleeve. This problem has not been discussed in engine theory before. D mathematical modeling of flame penetration and extinguishing processes in the specified gap of a hydrogen engine (D/S=86/86 mm/mm, Ne=60 kW, n=5500 min-1) was carried out. Critical gap sizes for various fuels have been established, heat transfer

Kavtaradze, Revaz, Natriashvili, Tamaz, Gladyshev, Sergey

Investigation into Abnormal Combustion Events in a PFI and DI Hydrogen Spark-Ignition Engine

2025-01-8399

04/01/2025

The hydrogen internal combustion engine technology, with its potential for almost full carbon emissions reduction and adaptability to a wide range of fossil fuel-based internal combustion engine (ICE) platforms, offers a promising future. However, as with any innovative technology, it also presents challenges, such as abnormal combustion phenomena. These challenges, including intake backfire, which is more common when using port fuel injection (PFI), and pre-ignition in the combustion chamber, which can be experienced with PFI or direct injection (DI), require detailed investigation to understand and optimize the engine’s performance and efficiencies. This study comprehensively investigates the main abnormal combustion events that could happen in a spark ignition (SI) hydrogen engine. It examines both direct and port fuel injection systems and uses high-resolution in-cylinder, intake, and exhaust pressure measurements alongside a suite of fast-response gas analyzers. The study provides

Mohamed, Mohamed, Mirshahi, Milad, Wang, Xinyan, Zhao, Hua, Harrington, Anthony, Hall, Jonathan, Peckham, Mark

High-Speed Optical Diagnostics of Misfire Limits in a Spark-Ignited Heavy-Duty Hydrogen Engine

2025-01-8401

04/01/2025

This study investigates the ignitability of hydrogen in an optical heavy-duty SI engine. While the ignition energy of hydrogen is exceptionally low, the high load and lean mixtures used in heavy-duty hydrogen engines lead to a high gas density, resulting in a much higher breakdown voltage than in light-duty SI engines. Spark plug wear is a concern, so there is a need to minimise the spark energy while maintaining combustion stability, even at challenging conditions for ignition. This work consists of a two-stage experimental study performed in an optical engine. In the first part, we mapped the combustion stability and frequency of misfires with two different ignition systems: a DC inductive discharge ignition system, and a closed-loop controlled capacitive AC system. The equivalence ratio and dwell time were varied for the inductive system while the capacitive system instead varied spark duration and spark current in addition to equivalence ratio. A key finding was that spark energy

Hallstadius, Peter, Saha, Anupam, Sridhara, Aravind, Andersson, Öivind

Effects of Lubricating Oil Consumption and Operation Duration on CO ₂ Accumulation and Efficiency in an Argon Power Cycle Hydrogen-Fueled Engine

2025-01-8436

04/01/2025

The trend of internal combustion engines is reducing or eliminating carbon emissions and improve the overall efficiency. The Argon Power Cycle hydrogen-fueled engine can specifically improve the thermal efficiency by employing argon as the working substance. At the same time, due to the utilization of hydrogen and oxygen, the combustion of the fuel in Argon Power Cycle hydrogen-fueled engines produces zero carbon emissions or NOx emissions. However, during engine operation, lubricating oil consumption can still generate CO2 and becomes the only source for carbon emissions. Furthermore, the accumulation of CO2 under closed cycle will impede the condensation recovery of argon and reduce the efficiency and power. In this study, a closed cycle model of Argon Power Cycle hydrogen-fueled engine was constructed, in which argon is recycled by condensation instead of being charged like air in an open cycle model. Effects of lubricating oil consumption and operation duration on CO2 accumulation

Wang, Chenxu, Li, Mo, SU, Xiang, Deng, Jun, Tian, Tian, Li, Liguang

Numerical Investigation of Injector Cap Design on Hydrogen Jet Characteristics

2025-01-8463

04/01/2025

One of the most critical enablers of hydrogen internal combustion engines is achieving rapid injection and mixing of hydrogen into the combustion chamber. Optimal cap is actively being investigated to improve the injector performance without major hardware modifications. In this study, detailed computational fluid dynamics simulations using the Reynolds-averaged Navier-Stokes (RANS) turbulence model were undertaken to investigate the behavior of hydrogen jets with various cap designs mounted on a hollow-cone injector within a constant volume chamber. It was found that the implementation of a cap in general enhances mixture formation, leading to a higher proportion of lean mixture over time. Key parameters, such as the cap's inner volume and throat area ratio, directly influence the amount of hydrogen mass trapped within the cap. A smaller volume or larger throat area ratio results in less trapped hydrogen mass. Excessive enlargement of the cap's throat area can lead to a decrease in

Zaihi, Abdullah, Moreno Cabezas, Kevin, Liu, Xinlei, Ben Houidi, Moez, Wu, Hao, AlRamadan, Abdullah, Cenker, Emre, Mohan, Balaji, Roberts, William, Im, Hong

Development of Non-Road Spark Ignited H2-ICE with Port Fuel Injection for Fixed Speed Applications

2025-01-8435

04/01/2025

The hydrogen internal combustion engine (H2-ICE) is an attractive powertrain solution for decarbonization of heavy equipment. This paper presents the development of a lean burn spark ignited (SI) H2-ICE with Port Fuel Injection (PFI). The targeted application is STAGE V fixed speed power generation realized without the need for NOx aftertreatment. A 13L EURO VI diesel engine is used as a base. The engine conversion process to hydrogen fuel is presented in detail discussing key aspects regarding both hardware and control software adaptations to fulfill the performance, emission, and safety requirements. In the development process, measurements have been performed on a single-cylinder and a multi-cylinder engine setup supported by detailed CFD computations to quantify operational limits and specify development directions. These results are translated into updated hardware and software of the fixed speed SI H2-ICE. The resulting H2-ICE is shown to comply with the requirements for power

Seykens, Xander, Doosje, Erik, Bekdemir, Cemil, Wezenbeek, Peter

The Role of Hydrogen in Exhaust Gas Aftertreatment Systems of Hydrogen Combustion Engines

2025-01-8496

04/01/2025

Hydrogen internal combustion engines (H2-ICE) do not emit any fuel-borne carbon emission species. Nitrogen oxides are the remaining raw emission species at significant levels. However, the exhaust aftertreatment system is exposed to a different exhaust matrix, including unburned hydrogen. This raises the question of the role of hydrogen emissions for the aftertreatment system. Extensive synthetic gas bench (SGB) test campaigns address the role of hydrogen in several production catalyst components. Starting with selective catalytic reduction (SCR) systems, a systematic variation of the hydrogen concentration shows rather small effects on the NOX reduction performance. A change in selectivity results in increased secondary N2O emissions for a copper-zeolite system, whereas a vanadium-based SCR catalyst is unaffected. However, both SCR types are highly sensitive to the NO2/NOX ratio in the raw emission. Therefore, an upstream oxidation catalyst remains important for low temperature

Sterlepper, Stefan, Lampkowski, Alexander, Himmelseher, Katrin, Özyalcin, Can, Claßen, Johannes, Pischinger, Stefan

Fundamental Experimental Evaluation of Hydrogen Combustion with Low Injection Pressure Using the Focusing Compression Principle

2025-01-8423

04/01/2025

In our laboratory, the focusing compression principle has been proposed, which is based on pulsed multi-jets of gas colliding around the chamber center. This aims to reduce the cooling loss on the chamber wall and the exhaust loss and improve the thermal efficiency. Our past studies focused on gasoline combustion experiments using the engine with the principle and suggested that the engine had the potential to achieve high thermal efficiency and knock resistance. Considering these past results and the growing interest in carbon-free fuels for net zero, in this paper, fundamental experimental evaluations of hydrogen combustion were principally conducted using the same engine with the focusing compression principle. The air was injected toward the chamber center from seven intake nozzles, while hydrogen gas was supplied from one intake nozzle, respectively. Hydrogen was injected with a relatively low pressure of 50 kPaG. This means that an injector with high injection pressure was not

Yamada, Sota, Naitoh, Ken, Baba, Shotaro, Ukegawa, Hiraku, Nishizawa, Tomohiko, Yatabe, Atsuhiro

Optical Investigation of DI Hydrogen Jet Development and Jet-Wall Interactions Under Engine-Like Conditions

2025-01-8456

04/01/2025

Direct injection (DI) hydrogen internal combustion engines are gaining attention as a promising technology for a sustainable energy transition, particularly in the transport sector. A key factor in improving the performance of these engines is understanding how hydrogen jets behave within the combustion chamber, especially their interactions with the chamber walls. These jet-wall interactions are critical since they have a major influence on fuel-air mixing which directly affects combustion efficiency and emissions. This study investigates the behavior of high-velocity hydrogen jets formed after exiting the injector. These jets propagate through surrounding air and interact with wall surfaces. When they impinge on wall surfaces, they undergo various processes such as radial spreading outward along the wall surface, mixing, and diffusion. These processes are influenced by factors including pressure ratio (PR) - the ratio between injection pressure and chamber pressure - and the geometry

Gong, Miaoxin, Lundgren, Marcus, Eismark, Jan, Andersson, Mats

Numerical Study of the Hydrogen/Air Mixing in a High Performance 2 Stroke Opposed Piston Engine

2025-01-8365

04/01/2025

Hydrogen as a fuel for internal combustion engines is the most promising candidate for the achievement of the zero-emissions target fixed by the European institutions for sports car applications. The development of a high-specific-power hydrogen engine is not trivial considering the low volumetric energy density of hydrogen. Furthermore, the necessity to reduce the engine encumbrance in favour of on-board fuel storage makes alternative engine architectures, such as the two-stoke opposed-piston design, particularly attractive. A numerical study is conducted to evaluate the potential of such architecture. First, the overall engine is simulated in a 1D-CFD framework assuming a fully homogeneous hydrogen/air mixture. Then, the intake and exhaust port phasing are optimized, and a 3D CAD model of the cylinder is developed based on the defined parameters. 3D-CFD simulations of the scavenging process are performed and employed to tune the 1D model. Starting from a single point injection

Marini, Alessandro, Volza, Antonello, Baudone, Antonio, Mattarelli, Enrico, Fontanesi, Stefano, Di Sacco, Michele, Tonelli, Roberto, Breda, Sebastiano

Exploring H ₂ /O ₂ Injection in an Active Pre-Chamber Ignition Engine

03-18-02-0013

03/04/2025

Active fuel injection into a pre-chamber (PC) promotes high-temperature and highly turbulent jets, which ignite the cylinder gas with a very high exhaust gas recirculation (EGR) ratio, reducing emissions such as NOx. In the present study, two active PC injection strategies were designed to investigate the effect of injected hydrogen mass and PC mixture air-to-fuel equivalence ratio λ on PC combustion, jet formation, and main chamber (MC) combustion. Stoichiometric or rich hydrogen/oxygen mixtures are actively injected into the PC to enhance the combustion processes in the PC and the MC. A three-dimensional numerical engine model is developed using the commercial CFD code CONVERGE. The engine geometry and parameters adopt a modified GM 4-cylinder 2.0 L GDI gasoline engine. The local developments of gas temperature and velocity are resolved with the adaptive mesh refinement (AMR). The turbulence of the flow is computed with the k-epsilon model of the Reynolds-averaged Navier–Stokes (RANS

Yu, Tianxiao, Lee, Dong Eun, Alam, Afaque, Gore, Jay P., Qiao, Li

HYDROGEN WON'T ACCEPT ‘NO’ FOR AN ANSWER

25AUTP03_01

03/01/2025

From automakers to companies in the wider mobility industry, hydrogen power is seeing no shortage of investment and research even as some remain unconvinced of its future. Most outsiders to the transportation industry don't know much about rapid developments in hydrogen fuel-cell and hydrogen internal-combustion. There just aren't the large-scale commercial and public efforts to inform the public as exist for the battery-electric vehicle market. Still, 50% of people in a recent Department of Energy survey said they understood that hydrogen has a chance to be a clean alternative source of power for vehicles and even for homes. Spotlight or no, progress is being made. And though much of it is outside the United States, American cities and companies have absolutely not given up on the technology. SAE Media wanted to check in and note recent transportation developments that use the earth's most abundant element.

Clonts, Chris

The Influence of Excess Air Ratio on NOx Emissions of Turbocharged Direct Injection Hydrogen Internal Combustion Engines

2025-01-7094

01/31/2025

Direct injection in the cylinder of a hydrogen internal combustion engine results in increasing NOx emissions in high-temperature oxygen rich environments. To explore the effect of excess air ratio λ on the NOx emissions of a direct injection hydrogen fueled internal combustion engine (HICE), a CFD simulation model was built based on a turbocharged direct injection hydrogen internal combustion engine using Converge software, and investigates the impact of lean burn on the NOx emissions. The simulation results show that increasing the excess air ratio λ can lower the in-cylinder mean temperature and effectively reduce the generation of NOx. The maximum temperature difference between λ=2.1 and λ=2.7 is 400K when engine speed is 4500 r/min. As the engine speed increases, under the same condition of λ, different loads at different speeds result in differences in the reaction temperature inside the cylinder, with higher temperatures at high speeds, so both the cylinder temperature and NOx

Peng, Tianyu, Luo, Qinghe, Tang, Hongyang

Research on Transient Performance of PFI Hydrogen Internal Combustion Engine

2025-01-7110

01/31/2025

Hydrogen, as a clean fuel, holds the potential to become a solution for transitioning traditional internal combustion engines. Under steady-state conditions, turbocharged hydrogen internal combustion engines can achieve zero carbon emissions through lean combustion. However, under transient conditions with rapid load changes, the transient performance and emissions of hydrogen engines pose significant challenges. In this paper, transient performance tests were conducted on a 4-cylinder turbocharged port-fuel injection hydrogen internal combustion engine, including constant speed load testing(800rpm-2000rpm) and the World Harmonized Transient Cycle test(WHTC). The transient response performance and emissions of the hydrogen engine were evaluated, and the test results were analyzed accordingly.

Wei, Jianyu, Luo, Qinghe, Tang, Hongyang

Investigation on the Influence of Nozzle Shape on Supersonic Hydrogen Jet

2025-01-7109

01/31/2025

The global energy crisis and environmental pollution problems have accelerated the process of the new energy technology revolution. Hydrogen energy is considered as one of the main forces of future green energy. Hydrogen internal combustion engines (H2ICES), as one of the main power forms of hydrogen energy application, have received extensive attention. It is worth noting that the characteristics of hydrogen jet affect the combustion performance and emission performance of hydrogen engines because they are directly related to the mixture formation process. In this paper, for a certain inner-opening direct injection (DI) nozzle, the Computational Fluid Dynamics (CFD) research method is used to explore the jet characteristics of the straight-hole (SH) nozzle, the diverging-tapered-hole (DTH) nozzle, and the stepped-hole (STH) nozzle from aspects such as mass flow rate, hydrogen mass fraction field, velocity field, and pressure field. The results show that for inward-opening DI nozzles

Yan, Chao, Luo, Qinghe, Li, Yikai, Tang, Hongyang

Efficiency Analysis of Hydrogen Internal Combustion Engine Power Generation System Based on Organic Hydrogen Storage Solution

2025-01-7117

01/31/2025

Organic solution is an ideal hydrogen storage and transport carrier, and the dehydrogenation of solution is an endothermic process. High dehydrogenation heat demand becomes a key factor restricting its application. Hydrogen internal combustion engine (HICE) is an ideal power device under the current background of emphasizing clean and low carbon. In this study, dibenzyltoluene (DBT) was selected as liquid organic hydrogen carrier (LOHC), the residual heat of engine exhaust was used as the heat source of organic solution dehydrogenation, and the residual heat of engine exhaust is used as the heat source of organic solution dehydrogenation, using the combustion of dehydrogenated hydrogen products to supplement the heat absorption of hydrogen released by organic solution. Taking hydrogen internal combustion engine power generation as the application scenario, the power generation system of liquid organic hydrogen storage solution combined with hydrogen internal combustion engine (LOHC

Zhang, Yulong, Luo, Qinghe, Sun, Baigang, Tang, Hongyang

Experimental Study on the Effects of Ammonia Energy Substitution Rate on Combustion and Emission Performance in a Hydrogen Engine

2025-01-7105

01/31/2025

To advance the application of zero-carbon ammonia fuel, this paper presents an experimental investigation on the potential of ammonia substitution using a 2.0L ammonia-hydrogen engine, where ammonia is injected into the intake port and hydrogen is directly injected into the cylinder. The study examines the effects of ammonia substitution rate under various load conditions on engine combustion and emission performance. Results indicate that the maximum ammonia energy substitution rate reached 98%, and within the stable combustion boundary, the mass fraction of unburned ammonia was less than 3%. The ammonia energy substitution ratio increased with load, and ammonia addition significantly suppressed pre-ignition and knocking. As ammonia content increased, ignition timing advanced, combustion duration extended, ignition delay prolonged, COV increased, peak cylinder pressure, and pressure rise rate decreased, with a corresponding decrease in peak heat release rate. Compared to a pure

Wu, Weilong, Xie, Fangxi, Chen, Hong, Du, Jiakun, Li, Yong

Driving Cycle Simulation and Performance Comparison of Hydrogen Engine Hybrid Electric Vehicle

2025-01-7001

01/31/2025

As a clean energy, low carbon and pollution-free, hydrogen is the preferred alternative fuel for traditional internal combustion engines. However, how to use hydrogen internal combustion engine to achieve satisfactory performance under vehicle conditions is still a challenge.In this paper, a vehicle simulation model is established based on a modified 25-ton hydrogen internal combustion engine truck, and the model is designed as a hybrid model by selecting a suitable motor. The two models are used to simulate the CHTC (China Heavy-duty Commercial Vehicle Test Cycle) cycle conditions. According to the simulation results, compared with the original vehicle's power performance and economy, the results show that the power performance is increased by 100%, and the economy is increased by 20%. Hybrid technology can effectively improve the performance of the vehicle.

Bai, Xueyan

Hydrogen Energy and Dongfeng Hydrogen Engine Development

2025-01-7113

01/31/2025

Hydrogen energy is the best form of energy to achieve "carbon peak, carbon neutrality", and is known as the most promising clean energy in the 21st century because of its diverse sources, clean and low-carbon, flexible and efficient, and wide application sce-narios. Hydrogen internal combustion engine has the advantages of zero carbon emission, high efficiency, high reliability and low cost, and has become one of the important directions of hydrogen energy application. The paper first analyzes the development and application of hydrogen energy industry in recent years, covering many aspects such as laws and regulations, energy structure, realization path, and development status. Then, the research and development process of the hydrogen engine of the technical team of Dongfeng Motor Group Co., Ltd. R&D Institute Department is introduced, and the effective thermal efficiency of 45.04% is achieved. Finally, the future of hydrogen engine is further prospected.

Jin, Xiaoyan, Zhang, Shemin, Duan, Shaoyuan, Liu, Cong, Zhou, Hongli

ERRATUM: Efficiency and Emissions of Electric and Hydrogen Light- and Heavy-Duty Vehicles

13-05-02-0015.1

01/16/2025

ERRATUM

Wade, Wallace R.

Letter from the Focus Issue Editors

03-17-08-0057

12/24/2024

Letter from the Focus Issue Editors

Lakhlani, Hardik, Kumar, Vivek, Wenbin, Yu, Bagga, Kalyan, Gundlapally, Santhosh, Di Blasio, Gabriele, Splitter, Derek, Rajendran, Silambarasan

TOC

99-06-06-0TOC

12/16/2024

TOC

Tobolski, Sue

SAE Truck & Off-Highway Engineering: December 2024

24TOFHP1212/12/2024

Demoing clean hydrogen combustion Backed by a consortium of companies, Southwest Research Institute's demonstrator vehicle aims to prove the commercial viability of hydrogen engines for on-road trucks. Improving the ageless ICE Clean-burning fuels, aftertreatment and other innovations place the heavy-duty combustion engine on a low-carbon emissions trajectory. Making software-defined vehicles cyber-secure Virtualization features such as digital twins and virtual patching can accelerate development and make commercial vehicles more agile and secure. Editorial Bauma the big one in 2025 CATL expands battery range for heavy-duty trucks and buses Donaldson's filters aim to keep fuel cells clean Shell's Starship 3.0 NG spotlights efficient powertrain, aero tech Sensata's sensors aid blind spot monitoring for tractor-trailers MTA expands wireless communication, EV tech for trucks Komatsu employs 'slick' battery swapping for underground LHD machine Liebherr, Fortescue reveal towering battery

Simulation Methodology for Hydrogen Concentration and Dilution Strategy in a Hydrogen Fueled Internal Combustion Engine

2024-28-0220

12/05/2024

Manufacturers of internal combustion engines are changing their focus to non-conventional fuels like hydrogen in response to the worrying global warming situation. When compared to conventional fuels like gasoline or diesel, the use of gaseous hydrogen fuel in an internal combustion engine powered by hydrogen can lessen the engine's negative environmental effects. But occasionally, hydrogen can leak from the high-pressure fuel injection system to the engine top cover and as blowby within the crankcase. Static zones may emerge because of these H2 leaks. Potential explosion or fire can result when the H2 concentration in these stagnation zones is more than 4% and triggers a minimum ignition energy of 0.02 mJ. A CFD simulation methodology incorporating multi-species model, piston, and crank motion to estimate the H2 concentration within crankcase is developed. The simulation development phases has been presented in the paper. The blowby values are determined from the experimental

Sahu, Abhay Kumar, Nagawade, Shubham, Veerbhadra, Swati

A Review of Hydrogen Storage System (HSS) and Hydrogen Internal Combustion Engine (H2-ICE) for the Potential H2-ICE Vehicle

2024-28-0129

12/05/2024

The different energy policies and legislations across the globe, unions, or country wise are the key influencer for evaluation of Transport Industry in both advancement of Technologies and Ecosystem development. Accordingly, European Climate law is focusing to achieve net zero greenhouse (or carbon neutral) gas emissions for EU (European Union) countries by 2050. Similarly in India, National Green Hydrogen Mission (NGHM) by Ministry of New and Renewable Energy (MNRE) is aiming for significant decarbonization and to become market leader in Green Hydrogen Transition. Hydrogen is potential fuel for H2-FCEV (Hydrogen Fuel Cell Electric vehicle) and H2-ICE (Hydrogen -Internal combustion Engine) due to its carbon free molecule and other properties. This review paper is focusing on comprehensive study of different aspects of H2- ICE vehicle. Key study areas are mainly Hydrogen (H2) as fuel, Hydrogen Storage System (HSS), H2-ICEs, Hydrogen storge pressure and H2-ICE vehicle architecture. The

Biswas, Sanjoy, Naik, Amit Kumar, Kashyap, Krishna

DEMOING CLEAN HYDROGEN COMBUSTION

24TOFHP12_01

12/01/2024

Backed by a consortium of companies, Southwest Research Institute's demonstrator vehicle aims to prove the commercial viability of hydrogen engines for on-road trucks. For decades, the running joke around hydrogen being a viable fuel for commercial trucks has been that it's “ten years away from being ten years away.” Though hydrogen-fueled rigs operating at scale has long seemed like a pipe dream, shifting winds around the globe blowing towards decarbonization have finally pushed this technology to be ready for the road. With the demand for the development of new propulsion technologies rising, organizations such as the Southwest Research Institute (SwRI) have ramped up R&D efforts to make this tech commercially viable. SwRI is an independent provider of research services and can rapidly assemble teams to tackle problems. SwRI's main mission is to push the boundaries of science and technology to develop innovative solutions.

Wolfe, Matt

The Effect Mechanism of Grain Size with Nanoscale and Microscale on Physical and Chemical Properties of Cu/SSZ-13 SCR Catalyst

2024-01-4305

11/05/2024

Selective catalytic reduction (SCR) technology is currently one of the most effective methods to reduce NOx emissions for engine. NH3-SCR technology is also considered to be the most promising hydrogen engine after-treatment device. This paper used Cu-SSZ-13, which is widely commercially available, as the research object, and explored the relationship between micron and nanoscale grain sizes through experimental methods such as BET, XRD, NH3-TPD, UV-vis-DRS and activity testing, the influence mechanism of micron-scale and nano-scale grain size on the morphology and properties of Cu/SSZ-13 catalyst was explored. The results show that the fresh nanoscale 900F sample has higher low-temperature NOx conversion efficiency, while the micron-scale 1800F sample has poor low-temperature activity and better high-temperature activity. This is closely related to its morphological characteristics, adsorption and desorption characteristics and dual-site properties. The specific surface area and total

Chen, Yajuan, Lou, Diming, Zhang, Yunhua, Tan, Piqiang, Fang, Liang, Hu, Zhiyuan

Numerical Evaluation of Fuel-Air Mixing in a Direct-Injection Hydrogen Engine Using a Multi-Hole Injector

2024-01-4295

11/05/2024

Hydrogen as a chemical energy carrier is considered as one of the most promising options to achieve effective decarbonization of the transportation sector, due to its carbon-free chemical composition. This is particularly true for applications that rely on internal combustion engines (ICEs), although much research is still needed to achieve stable, reliable, and safe operations of the engine. To this purpose, direct injection (DI) of gaseous hydrogen during the compression stroke offers great potential to avoid backfire and largely reduce preignition issues, as opposed to port-fuel injection. Recently, much research has been dedicated, both experimentally and numerically, to understanding the physics and chemistry connected with hydrogen’s mixing and combustion processes in ICEs. This work presents a computational fluid dynamics (CFD) study of the hydrogen DI process in an optical engine operating at relatively low tumble conditions. Gaseous hydrogen pressurized at 86 bar is introduced

Torelli, Roberto, Wu, Bifen, Park, Ji-Woong, Pei, Yuanjiang

Experimental Study on Quality Control and Variable Valve Timing Strategy of Hydrogen Engine for High Efficiency and Low Emission at Low Load

2024-01-5095

10/15/2024

In order to reduce the pumping loss of low loads and maximize the lean combustion advantage of hydrogen, the paper proposes a load control strategy based on hydrogen mass, called quality control, for improving thermal efficiency and emissions at low loads. The advantages of quality control and the effect of VVT on the combustion performance of hydrogen internal combustion engines under low loads were discussed. The results show that when the relative air–fuel ratio (λ) increases to more than 2.5, the NOx emissions are reduced to less than 3.5 g/kW · h at the brake mean effective pressure (BMEP) below 8 bar, especially when the BMEP is less than 5 bar, the NOx is within 0.2 g/kW · h. Compared to quantity control based on air mass, the quality control strategy based on hydrogen mass achieves over a 2.0% reduction in pumping loss at BMEP levels lower than 4.4 bar. Furthermore, it enhances thermal efficiency by up to 5% at low loads, while maintaining NOx emissions within 0.2 g/kW · h at

Li, Yong, Chen, Hong, Fu, Zhen, Du, Jiakun, Wu, Weilong

Letter from the Focus Issue Editors

03-17-07-0049

10/12/2024

Letter from the Focus Issue Editors

Lakhlani, Hardik, Kumar, Vivek, Wenbin, Yu, Bagga, Kalyan, Gundlapally, Santhosh, Di Blasio, Gabriele, Splitter, Derek, Rajendran, Silambarasan

Hydrogen Engine Development toward Performance Parity with Conventional Fuel-Type Engines While Ensuring Ultralow Tailpipe Emissions

03-17-08-0061

09/25/2024

The societies around the world remain far from meeting the agreed primary goal outlined under the 2015 Paris Agreement on climate change: reducing greenhouse gas (GHG) emissions to keep global average temperature rise to well below 20°C by 2100 and making every effort to stay underneath of a 1.5°C elevation. In 2020 direct tailpipe emissions from transport represented around 8 GtCO2eq, or nearly 15% of total emissions. This number increases to just under 10 GtCO2eq when indirect emissions from electricity and fuel supply are added, for a total share of roughly 18%. Following the current trend, direct and indirect emissions in transport could reach above 11 GtCO2eq by 2050. Roughly 76% of transport emissions are related to land-based passenger and freight road transport. Emissions from aviation and shipping account for the remaining 24% of 2020 emissions. Hydrogen (H2) is in this scenario considered to play a key role as a carbon-free and versatile energy carrier. Combustion of hydrogen

Koerfer, Thomas, Durand, Thomas, Virnich, Lukas

Exploring the Impacts of Hydrogen Internal Combustion Engine (H2 ICE) Technology on Vehicle Thermal Systems (Radiator and Charge Air Cooler): A Review

2024-28-0051

09/19/2024

This research paper investigates the implications of Hydrogen Internal Combustion Engine (H2 ICE) technology in the field of automotive thermal management, with a particular emphasis on truck radiator and charged air cooler systems. As the automobile industry works to shift to more sustainable and environmentally friendly solutions, hydrogen-powered vehicles provide a viable alternative to their conventional fossil fuel-powered counterparts. The study investigates the unique thermal characteristics of H2 ICE technology, the modifications required in H2 ICE technology due to specific requirements of air in the combustion, and changes in auxiliary components of the engine, where heating or cooling is required. Based on these changes, assess their impact on radiator and charged air cooler systems, which are critical components in maintaining the thermal equilibrium of internal combustion engines. Few inferences related to the impact on the Radiator and Charge Air Cooler are made after

Menariya, Pravin Ganesh, Shinde, Viraj

Deep Reinforcement Learning Based Application of Exhaust Gas Aftertreatment Control Using the Example of a Hydrogen Engine

2024-24-0043

09/18/2024

Growing environmental concerns drive the increasing need for a more climate-friendly mobility and pose a challenge for the development of future powertrains. Hydrogen engines represent a suitable alternative for the heavy-duty segment. However, typical operation includes dynamic conditions and the requirement for high loads that produce the highest NOx emissions. These emissions must be reduced below the legal limits through selective catalytic reduction (SCR). The application of such a control system is time-intensive and requires extensive domain knowledge. We propose that almost human-like control strategies can be achieved for this virtual application with less time and expert knowledge by using Deep Reinforcement Learning. A proximal policy optimization (PPO) -based agent is trained to control the injection of Diesel exhaust fluid (DEF) and compared with the performance of a manually tuned controller. The performance is evaluated based on the restrictive emission limits of a

Itzen, Dirk, Angerbauer, Martin, Hagenbucher, Timo, Grill, Michael, Kulzer, Andre

Optimization of a Virtual H2 Engine Using a 1D Simulation Tool Targeting High Engine Performance along with Near-Zero Emission Levels

2024-24-0015

09/18/2024

Hydrogen engines are currently considered as a viable solution to preserve the internal combustion engine (ICE) as a power unit for vehicle propulsion. In particular, lean-burn gasoline Spark-Ignition (SI) engines have been a major subject of investigation, due to their reduced emission levels and high thermodynamic efficiency. Lean charge is suitable for passenger car applications, where the demand of mid/low power output does not require an excessive amount of air to be delivered by the turbocharging unit, but can difficulty be tailored in the field of high-performance engine, where the air mass delivered would require oversized turbocharging systems or more complex charging solutions. For this reason, the range of feeding conditions near the stochiometric is explored in the field of high-performance engines (20 BMEP), leading to the consequent issue of abatement of pollutant emissions. In this work, a 1D model is applied to the modeling of a four cylinder engine fueled with direct

Marinoni, Andrea, Montenegro, Gianluca, Cerri, Tarcisio, Della Torre, Augusto, Onorati, Angelo

Simulation of Hydrogen Combustion in Spark Ignition Engines Using a Modified Wiebe Model

2024-01-3016

07/02/2024

Due to its physical and chemical properties, hydrogen is an attractive fuel for internal combustion engines, providing grounds for studies on hydrogen engines. It is common practice to use a mathematical model for basic engine design and an essential part of this is the simulation of the combustion cycle, which is the subject of the work presented here. One of the most widely used models for describing combustion in gasoline and diesel engines is the Wiebe model. However, for cases of hydrogen combustion in DI engines, which are characterized by mixture stratification and in some cases significant incomplete combustion, practically no data can be found in the literature on the application of the Wiebe model. Based on Wiebe’s formulas, a mathematical model of hydrogen combustion has been developed. The model allows making computations for both DI and PFI hydrogen engines. The parameters of the Wiebe model were assessed for three different engines in a total of 26 operating modes. The

Osetrov, Oleksandr, Haas, Rainer

The 3D-CFD Contribution to H ₂ Engine Development for CV and Off-Road Application

2024-01-3017

07/02/2024

The hydrogen engine is one of the promising technologies that enables carbon-neutral mobility, especially in heavy-duty on- or off-road applications. In this paper, a methodological procedure for the design of the combustion system of a hydrogen-fueled, direct injection spark ignited commercial vehicle engine is described. In a preliminary step, the ability of the commercial 3D computational fluid dynamics (CFD) code AVL FIRE Classic to reproduce the characteristics of the gas jet, introduced into a quiescent environment by a dedicated H2 injector, is established. This is based on two parts: Temporal and numerical discretization sensitivity analyses ensure that the spatial and temporal resolution of the simulations is adequate, and comparisons to a comprehensive set of experiments demonstrate the accuracy of the simulations. The measurements used for this purpose rely on the well-known Schlieren technique and use helium as a safe substitute for H2. They reveal how the jet properties

Cassone Potenza, Magda Elvira, Gaballo, Maria Rosaria, Geiler, Jan Niklas, Iacobazzi, Marino, Cornetti, Giovanni, Kulzer, Andre Casal

TOC

99-06-03-0TOC

06/21/2024

TOC

Tobolski, Sue

Sustainable Fuels for Long-Haul Truck Engines: A 1D-CFD Analysis

2024-37-0027

06/12/2024

Heavy duty engines for long-haul trucks are quite difficult to electrify, due to the large amount of energy that should be stored on-board to achieve a range comparable to that of conventional fuels. In particular, this paper considers a stock engine with a displacement of 12.9 L, developed by the manufacturer in two different versions. As a standard diesel, the engine is able to deliver about 420 kW at 1800 rpm, whereas in the compressed natural gas configuration the maximum power output is 330 kW, at the same speed. Three possible alternatives to these fossil fuels are considered in this study: biodiesel (HVOlution by Eni), bio-methane and green hydrogen. While the replacement of diesel and compressed natura gas with biofuels does not need significant hardware modifications, the implementation of a hydrogen spark ignition combustion system requires a deep revision of the engine concept. For a more straightforward comparison among the alternative fuels, the same engine platform has

Volza, Antonello, Pisapia, Alfredo, Caprioli, Stefano, Rinaldini, Carlo, Mattarelli, Enrico

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