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System Validation & Verification Plan Template - ARP4754AARP4754A_PL_009 (Current)To be published on 08/13/2201
SintzADMIn, Jeneane, Mcgovern, Mike, null, null, SintzUSER, Jeneane, RickardTestUser, ChrisTest, Mutz, Jennifer2, Mutz, Jennifer
Test 04J1000004_202507 (Current)07/21/2025
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Automotive Electronic Systems Reliability Standards
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Automotive Electronic Systems Reliability Standards
Test01J1000001_202507 (Current)07/21/2025
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Automotive Electronic Systems Reliability Standards
IL Standards (without alternate ExternalId)J07212025-01_202507 (Current)07/21/2025
IL Standards (without alternate ExternalId)
Automotive Electronic Systems Reliability Standards
J07212025-02J07212025-ALT_EXTERNAL_ID-02_202507 (Current)07/21/2025
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Automotive Electronic Systems Reliability Standards
J0721204J0721204-ALT_EXTERNAL_ID-03_202507 (Current)07/21/2025
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Automotive Electronic Systems Reliability Standards
J0721205J0721205-ALT_EXTERNAL_ID-00000005_202507 (Current)07/21/2025
J0721205
Automotive Electronic Systems Reliability Standards
Testing ARP Spec 07212025 (with alternateExternalId)ARP07212025-01-ALT_EXTERNAL_ID (Current)07/21/2025
Testing ARP Spec 07212025 (with alternateExternalId)
A-5 Aerospace Landing Gear Systems Committee
Testing AS Spec 07212025 (without alternateExternalId)AS-07212025 (Current)07/21/2025
Testing AS Spec 07212025 (without alternateExternalId)
AMS CE Elastomers Committee
Testing ARP Spec 07212025 (with alternateExternalId)AS07212025-011-ALT_EXTERNAL_ID (Current)07/21/2025
Testing ARP Spec 07212025 (with alternateExternalId)
AMS CE Elastomers Committee
Testing Looooooooooooooog alternateExternalId - 4J0718-01-000000000000000000000004_202507 (Current)07/18/2025
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Automotive Electronic Systems Reliability Standards
Testing a loooooooooooooooooooooooong alternateExternalId - 7ARP07182025-7-0000000000000000001 (Current)07/18/2025
Testing a loooooooooooooooooooooooong alternateExternalId - 7
A-5B Gears, Struts and Couplings CommitteeNEW
This is a new bookMMS-BOOK-00107/09/2025
A book about nothing
SAE TOMORROW TODAY - Smarter Automotive Testing with AI and Simulation1352207/03/2025
The new test track isn't asphalt--it's AI and simulation. From hardware-in-the-Loop (HIL) to real-time performance analytics, new innovations are reshaping how vehicles are designed, validated, and brought to market. At the forefront of this transformation is A&D Technology, a leader in integrated test automation and lab management solutions for the transportation and energy markets. By integrating AI-driven analytics with high-fidelity simulation environments, the company is empowering automotive engineers to streamline testing workflows, reduce physical prototypes, and accelerate innovation in everything from EV powertrains to autonomous systems. To learn more, we sat down with Mike Uhl, President & CEO, to discuss how A&D Technology's work in simulation and test automation is helping engineers bring the next generation of mobility technologies to life. We'd love to hear from you. Share your comments, questions and ideas for future topics and guests to podcast@sae.org. Don't forget
Hineman, Marcie
SAE TOMORROW TODAY - Digital Engineering for Defense and Beyond1352007/01/2025
If you were to build the perfect use case for the potential of digital engineering, you would be hard-pressed to choose a better sector than the defense industry. That's why the Pentagon isn't just intrigued by digital engineering-it's made it mandatory. As the U.S. military targets groundbreaking technology improvements that safeguard lives and improve defense capabilities, Ansys is helping connect the dots between people, processes, and technology with the predictive power of simulation. Establishing a digital engineering ecosystem, including digital twins, contributes to the resilience and adaptability of innovations across industries. To learn more, we sat down with Dr. Armond E. Sinclair, Sr. Technical Account Executive for Ansys Government Initiatives, to discuss how digital engineering is enabling smarter decision-making, reducing costs, and accelerating innovation at the Department of Defense (DoD) and beyond. We'd love to hear from you. Share your comments, questions and ideas
Hineman, Marcie
SAE TOMORROW TODAY - Women Breaking Barriers in Aerospace & Beyond1352107/01/2025
Despite decades of progress, the number of women in engineering remains stubbornly low -- especially in aerospace and mechanical engineering. But that isn't stopping the winner of the Aerospace/Defense category in the inaugural Women in Engineering: Rising Star Awards. Heather Cummings is Senior Engineer, Flight Controls & Autonomy for Sikorsky, a Lockheed Martin company. She leads the development of hybrid electric propulsion controls and vehicle management systems for Sikorsky's next-gen HEX and RBW, including groundbreaking work on fully autonomous cargo aircraft. A licensed pilot, Heather is passionate about improving flight safety through automation and mentoring the next generation of aspiring engineers. In this special episode, Heather and Chitra Sethi, Director of Editorial & Digital Content, SAE Media Group, discuss the mission behind the Rising Star Awards, the importance of visibility for women in STEM, and why inspiring the next generation is just as critical as
Hineman, Marcie
SAE TOMORROW TODAY - The Hidden Role of Battery Vents in EV Safety and Adoption1351906/12/2025
One failure can reshape public trust in EVs overnight. That's why every detail matters--and why collaboration across the entire EV ecosystem is critical. Even small components like battery pack vents play an outsized role in preventing thermal runaway events, explosions, and fires. The SAE Battery Pack Venting Committee understands this challenge and answered the call with the new SAE J3325(TM) Technical Information Report a guide to designing, testing, and integrating battery vents that perform when it matters most. To dive deeper, we spoke with Dr. Michael Harenbrock, Principal Expert of Electric Mobility at MANN+HUMMEL GmbH, and chair of the SAE Battery Pack Venting Committee about how SAE J3325 is helping engineers enhance EV battery safety--and how their work evolves to keep pace with emerging ventilation technologies and trends. Want to help shape the future of EV safety? Join an SAE Committee today! Contact Standards Specialist Dante Rahdar at dante.rahdar@sae.org. We'd love to
Hineman, Marcie
SAE TOMORROW TODAY - Removing Roadblocks to Fleet Electrification1351806/07/2025
What does it really take to electrify America's fleets? From skyrocketing insurance rates to policy risks to reduced incentives, the market dynamics are complex. Enter Electrada, a Cincinnati-based EV infrastructure company revolutionizing how fleets transition to clean energy. As the developer, owner, and operator of electric fueling assets, Electrada offers a unique 360 Charging-as-a-Service (CaaS) model that delivers zero capital investment, 99%+ uptime, predictable pricing, and expert management. Serving all fleet types across multiple transportation sectors, Electrada designs fully tailored, long-term EV charging solutions that reduce cost per mile from day one with no operational disruptions or price risk. Listen in as we sit down with Kevin Kushman, CEO of Electrada, to discuss the challenges and opportunities in the North American fleet electrification market. We'd love to hear from you. Share your comments, questions and ideas for future topics and guests to podcast@sae.org
Hineman, Marcie
SAE TOMORROW TODAY - Riding the EV Wave With Smarter Batteries1351705/29/2025
As OEMs race to deliver new vehicle lineups with greater speed and efficiency, the industry finds itself navigating a complex crossroads between full EVs and hybrid models. That's where ENNOVI steps in. With a focus on smarter battery management and cutting-edge electrical architecture, ENNOVI is staying agile--offering the right product mix to help OEMs and suppliers ride the wave of electrification, battery technology improvements, and market shifts without missing a beat. Listen in as we sit down with Ron Puhl, Global Director of Engineering and Product Portfolio, to discuss how ENNOVI's Current Collector System (CCS) is helping to improve the overall package size of batteries while reducing costs. It's a unique discussion with deep insight into consumer EV demand and industry trends. We'd love to hear from you. Share your comments, questions and ideas for future topics and guests to podcast@sae.org. Don't forget to take a moment to follow SAE Tomorrow Today--a podcast where we
Hineman, Marcie
SAE TOMORROW TODAY - Engineering with Purpose: The SAE Story You Need to Hear1351605/22/2025
Innovation isn't a solo act--it's a team sport. And if you're an engineer, the world needs your expertise now more than ever. SAE International is a place where engineers, dreamers, and doers unite to build a safer, smarter future. Our lively community is made up of cross-disciplinary volunteers who develop life-saving standards, mentor the next generation, and work collaboratively to build a strong and ethical foundation for powerful emerging technologies. Listen in as Dr. Jacqueline El-Sayed, CEO of SAE International, shares how SAE is setting the standard (literally) for tomorrow's mobility solutions while fostering professional growth and collaboration along the way. Ready to make an impact and level up your career? Whether you're passionate about safety standards, emerging tech, or mentoring the next generation, volunteering with SAE connects you with a global network of innovators just like you. You'll gain leadership experience, grow your expertise, and help drive real change in
Hineman, Marcie
This is a book title - updatedEXAMPLE-BOOK05/22/2025
We have an abstract!
SAE TOMORROW TODAY - How Autonomy is Breathing New Life into Farming1351505/16/2025
Labor shortages are pushing many family farms to the brink. The solution? Autonomous technology which is emerging as a game-changer--boosting productivity, cutting risk, and giving family farms a fighting chance to thrive for generations to come. At the forefront of this transformation is Blue River Technology, a John Deere subsidiary leading the charge in precision agriculture. From AI-driven tools to autonomous machinery, the company is helping to build the future of farming the John Deere way, meeting farmers in the field and designing solutions grounded in real-world challenges. With safety and scalability built in, farmers can start small with retrofit kits that upgrade existing tractors, making automation more accessible than ever. To learn more, we caught up with Aaron Wells, Director of Engineering at Blue River, to explore how automation is transforming agriculture and giving farmers the tools they need to stay ahead--despite labor challenges. We'd love to hear from you. Share
Hineman, Marcie
SAE TOMORROW TODAY BRIEFS - Roberto Signs Off...Here's Why You'll Want to Follow Along1351405/08/2025
After delivering sharp, witty insights on automation, EVs, and sustainability, Roberto Baldwin's time on SAE Tomorrow Today Briefs is wrapping up, but for listeners, the journey's just getting interesting. In his final episode, Roberto shares what's next: joining the SAE Media Group to cover even more of the mobility universe--from traditional gas-powered vehicles to EVs, automation, aerospace and student engineers shaping tomorrow. Expect new videos, articles, and yes...a new podcast. Tune in for his final sign-off (with a few laughs and lots of heart) and follow his journey at sustainablecareers.sae.org, sae.org/news, and youtube.com/@saeinternational. Follow SAE on LinkedIn, Instagram, Facebook, Twitter, and YouTube. Follow host Grayson Brulte on LinkedIn, Twitter, and Instagram.
Hineman, Marcie
SAE TOMORROW TODAY - Scalable AV Deployment Starts with Fewer Close Calls1351305/01/2025
The hallmark of exceptional autonomous driving technology isn't just how it reacts in a crisis but how it avoids one altogether. That's the vision behind May Mobility: a world where self-driving cars confidently navigate busy intersections, unexpected detours, and pedestrian-filled crosswalks with the instincts of a seasoned human driver. At the core of May Mobility's technology platform is its patented Multi-Policy Decision Making (MPDM) system. This breakthrough technology uses real-time, in-situ AI to interpret data, continuously learning and adapting to new, complex, and unpredictable driving conditions. By learning on the fly--much like a human driver--May Mobility's AVs can be deployed faster and more cost-effectively than traditional systems. To explore how May Mobility is scaling its AV technology, we spoke with Ed Olson, CEO and Founder, about the company's city-wide AV deployments, strategic partnerships with Toyota and NTT, and its entrance into the rideshare market through
Hineman, Marcie
SAE TOMORRO TODAY BRIEFS - Scaling Software-Defined EV Fleets1351204/24/2025
When it comes to electrifying commercial vehicle fleets, one company offers a transformative modular platform that can drastically reduce the time to market. REE Automotive is a publicly traded company that designs and manufactures advanced software-defined vehicles (SDVs) that are fully electric, capable of autonomy, and compatible with existing fleet management software. The company recently began production on its first medium-duty truck for the US market and has since seen a 230% growth in reservations, indicating strong customer interest and positive feedback. To learn more, Roberto Baldwin, Sustainability Editor, SAE Sustainable Mobility Solutions, recently sat down with Daniel Barel, CEO, and Pete Dow, VP of Engineering, to discuss REE Automotive's revolutionary approach to scaling software-defined commercial EV fleets. For more information on the evolution of sustainability, head on over to sustainablecareers.sae.org. There, you can check out our podcast on the state of NEVI
Hineman, Marcie
Quantitative Analysis of a Hybrid Electric HMMWV for Fuel Economy Improvement2024-01-335604/23/2025
ABSTRACT This paper presents a quantitative analysis and comparison of fuel economy and performance of a series hybrid electric HMMWV (High Mobility Multi-purpose Wheeled Vehicle) military vehicle with a conventional HMMWV of equivalent size. Hybrid vehicle powertrains show improved fuel economy gains due to optimized engine operation and regenerative braking. In this paper, a methodology is presented by which the fuel economy gains due to optimized engine are isolated from the fuel economy gains due to regenerative braking. Validated vehicle models as well as data collected on test tracks are used in the quantitative analysis. The regenerative braking of the hybrid HMMWV is analyzed in terms of efficiency from the kinetic energy at the wheels to the portion of regenerative power which is retrievable by the battery. The engine operation of both the series hybrid and conventional HMMWV are analyzed using a 2-D bin analysis methodology. Finally, the vehicle model is used to make
Nedungadi, Ashok, Masrur, Abul, Khalil, Gus
BALL BEARINGS.06000204/23/2025
HESS, HENRY
Development and Validation of a Reduced Order Model Incorporating a Semi-Empirical Degradation Model for Pouch Type LiFePO 4 /Graphite Cells2017-01-121804/23/2025
We propose a reduced order model (ROM) for LFP/graphite cells derived from the electrochemical thermal principles that considers degradation effects and validated against experimental data obtained from a large format pouch type LFP/graphite cell whose nominal capacity is 20Ah. The characteristics of the two-phase transition and path dependence were taken into account in the ROM using a shrinking-core model with a moving interface that presents lithium rich and deficient phase. Different currents (0.1/1/3/4C) were applied to fresh cells at different ambient temperatures (25/35/45°C). Comparison between simulated results of the ROM and the collected experimental data shows a good match. The path dependence was also analyzed experimentally. For degradation model, side reaction is treated as the predominant cause of degradation of cells, which are affected by the operating conditions, such as temperature and SOC cycling range. At every 30 or 40 cycles, the capacity and impedance of five
ZHAO, XINCHEN, Bi, Yalan, Choe, Song-Yul
Basic Science and Art of Aircraft Wreckage ReconstructionR-48004/23/2025
Basic Science and Art of Aircraft Wreckage Reconstruction is a unique title which addresses important aspects of investigating crashes, who does this kind of work, and how a healthy attitude and open mind are required to properly perform investigations. It also discusses what to expect from the on-scene part of the investigation, and the fundamental approaches to common types of wreckage reconstruction. Written by Don Knutson, a veteran of this industry, Basic Science and Art of Aircraft Wreckage Reconstruction is intended for the practitioner, student, or those who are simply curious about how aircraft wreckage is reconstructed. Full references are provided in the various chapters for additional reading and research. Many examples of aircraft crash scenarios and circumstances are presented in a "generic" form but relate to actual investigations, which should prove as a useful investigative resource whether you are an apprentice or an experience professional with a government aviation
Knutson, Donald F.
Basic Investigation of Thermodynamic Effects on a Hydrogen Two-Stroke Engine2024-32-003904/18/2025
The spark ignited two-stroke engine, as a cost-efficient power unit with low maintenance demand, is used millionfold for the propulsion of hand-held application, motorcycles, scooters, boats and others. The outstanding power to weight ratio is the key advantage for two-stroke engines. However, poor exhaust emissions, caused by high scavenge losses, especially on port controlled two-stroke engines, and a low efficiency are disadvantages of this combustion process. Under the aspect of increasing environment- and health awareness, the two-stroke technology driven with fossil resources, shows no future advantage. The anthropogenic climate change force for sustainable development of combustion engines whereby reduction of fuel consumption or usage of alternative fuels is an important factor. Best way of a decarbonization to fulfil future climate goals is the utilization of non-carbon fuels. In this field of fuels, hydrogen, with its high energy content and close inexhaustible availability
Yasuda, Terutaka, Oswald, Roland, Kirchberger, Roland
SAE TOMORROW TODAY: Advancing the Path to Full Autonomy1351104/18/2025
From advancements in ADAS (Advanced Driver Assistance Systems) to the importance of AI and redundancy, the path to autonomy is paved with delivering valuable intelligence that optimizes safety. Mobileye is a leader in autonomous driving and driver-assistance technologies, harnessing world-renowned expertise in computer vision, artificial intelligence, mapping, and data analysis. The company's diverse product portfolio ranges from driver assist systems to fully autonomous vehicles, all designed to enhance safety, comfort, and efficiency on the road. To learn more, we sat down with Nimrod Nehushtan, Executive Vice President of Business Development Strategy, to discuss the innovative AI technologies powering Mobileye's products, the importance of redundancy in ensuring reliability, and the company's strategic partnerships with leading OEMs. We'd love to hear from you. Share your comments, questions and ideas for future topics and guests to podcast@sae.org. Don't forget to take a moment to
Hineman, Marcie
A Two-Step Approach for Tire Lateral Force Observation for Motorcycles2024-32-004304/18/2025
This study presents a two-step method for estimating motorcycle tire lateral forces, which are critical to the safety of driver assistance systems. In the pre-filtering stage, a partial attitude of the motorcycle is estimated using a Kalman filter and a kinematic model. In the observation stage, the side slip angle and subsequently the tire lateral forces are provided by a sliding mode observer. It extends previous research by incorporating both out-of-plane and in-plane dynamics. The paper also proposes an approach for selecting the Kalman filter parameters. An approach to identify the stochastic sensor errors of the inertial measurement unit is presented. The identified parameters are used as a basis for the selection of the covariances. The overall study provides a practical implementation strategy and demonstrates its applicability in real-world scenarios. The experiments show the results of the lateral force estimation and its relation to the friction ellipse. The effectiveness of
Winkler, Alexander, Grabmair, Gernot, Reger, Johann
Experimental Investigation of n-C7H16/Ethanol Blended Fuels on Auto-ignition and Flame Propagation in High Temperature/Pressure Constant-Volume Combustion Vessel2024-32-005004/18/2025
This study aims to investigate the effect of ethanol blends on flame propagation and auto-ignition under high pressure and high temperature conditions. Experimental investigations are conducted using n-C7H16 / ethanol blends at various blending ratios (0, 5, 10, 20, 40, 70, and 100 vol%). The blends are premixed with air at stoichiometric ratios and ignited centrally in a cylindrical constant-volume combustion chamber (20-mm inner diameter, 80-mm long) under elevated temperature (500 K) and pressure (1.0 MPa) conditions. The results show that auto-ignition occurs at an ethanol blend ratio of 10% or less and ceases above 20%. Increasing the ethanol blend to 70% results in a slight change in flame propagation speed, with a noticeable delay at 100%. The pressure measurements show a peak of about 5.6 MPa at a blend ratio of 5%, which gradually decreases with increasing ratios. High-pass filtering reveals the maximum pressure fluctuation amplitude at the 5% blend ratio, indicating increased
Tateishi, Tokua, Yamaguchi, Riki, Shimokuri, Daisuke, Terashima, Hiroshi, Hara, Takaya, Honda, Yuya, Kawano, Michiharu
Traction Voltage Level in Two-Wheelers: Considerations on Safety and Performance2024-32-006204/18/2025
Most electric 2-wheelers on the market today seek to replace combustion engine vehicles from 50cc to 150cc which equates to an electric motor power between 2 and 12 kW. The traction voltage level of these vehicles is mostly between 44V and 96V. However, the actual choice of voltage on a specific vehicle seems to be arbitrary and higher voltage does not necessarily correlate with higher motor power. This paper seeks to highlight considerations and tradeoffs which feed the choice of traction voltage levels. Important criteria are electrical safety standards and their impact on vehicle electrical architecture, the performance and availability of key electronics parts such as capacitors, MOSFETs, and gate drivers, while also highlighting functional safety aspects. This paper shows by a comprehensive analysis of the motor drive that for the vehicle class mentioned above the traction voltage level can be kept below 60V without any performance impact, while also ensuring electrical and
Schmitt, Stefan
3D-CFD Simulations of H2 ICEs: A Preliminary Evaluation of a Laminar Flame Speed Correction for Thermo-Diffusive Instability2024-32-007404/18/2025
In recent years, climate change and geopolitical instability have intensified the focus on sustainable power generation. This shift seeks alternatives that balance environmental impact, cost-effectiveness, and practicality. Specifically, in transportation and power generation, electric motors face challenges against internal combustion engines due to the high cost and mass of batteries required for energy storage. This makes electric solutions less favorable for these sectors. Conversely, internal combustion engines, when properly fueled, offer cost-effectiveness and a quasi-environmentally-neutral option. To address these challenges, researchers have explored e-fuels derived from renewable sources as a carbon-neutral supply for internal combustion engines. Among these, hydrogen is particularly promising. In hydrogen-powered internal combustion engines, 3D-CFD (Computational Fluid Dynamics) in-cylinder models are crucial. Once validated, these models can speed up the design process. A
Sfriso, Stefano, Berni, Fabio, Breda, Sebastiano, Fontanesi, Stefano, Cordisco, Ilario, Leite, Caio Ramalho, Brequigny, Pierre, Foucher, Fabrice
Development of the Mild Hybrid System for Off-Road Machinery2024-32-006704/18/2025
In recent years, the importance of achieving carbon neutrality has been highlighted in response to the escalating severity of climate change. In the leading automobile market, the share of electric vehicles is gradually expanding, especially in passenger car sector. However, it is not same in commercial vehicle sector. In the off-road machinery market, as with electrification in commercial vehicles, the factors such as the need to install charging infrastructure and the requirement for large batteries to expand operating duration are significant challenge to full electrification. As one of the realistic solutions toward carbon neutrality for off-road machines, methods to utilize both internal combustion engines (ICE) and their applied products are being reconsidered. Under the circumstances, we have developed a mild-hybrid (MH) system for small off-road machinery. This system adopts a 48V power supply in order to minimize size of the system offers as a “Drop-in” package solution. This
Koyama, Kazuaki, Kimura, Ryota, Nagamori, Yuko, Horita, Tatsuhiko, Nosaka, Kento
Prediction Method of Strength Robustness Affected by Arc Welding Sectional Dimensions2024-32-003804/18/2025
The arc welding process is essential for motorcycle frames, which are difficult to form in one piece because of their complex shapes, because a single frame has dozens of joints. Many of the damaged parts of the frames under development are from welds. Predicting the strength of welds with high reliability is important to ensure that development proceeds without any rework. In developing frames, CAE is utilized to build up strength before prototyping. Detailed weld shapes are not applicable to FE models of frames because weld shapes vary widely depending on welding conditions. Even if CAE is performed on such an FE model and the evaluation criteria are satisfied, the model may fail in the actual vehicle, possibly due to the difference between CAE and actual weld bead geometry. Therefore, we decided to study the extent to which the stresses in the joint vary with the variation of the weld bead geometry. Morphing, a FE modeling method and design of experiment method, was utilized to
Hada, Yusuke, Sugita, Hisayuki
Novel Statistical Modelling-Based Approach for Exhaust Mass Flow Calculation in Motorcycles2024-32-007204/18/2025
The exhaust mass flow measurement for motorcycles poses a unique challenge due to presence of pulsations arising from an unfavorable combination of the engine displacement-to-exhaust system volume ratio and the long or even unequal ignition intervals. This pulsation phenomenon significantly impacts the accuracy of the differential pressure-based measurement method commonly employed in on-board measurement systems for passenger cars. This paper introduces an alternative approach calculating exhaust mass flow in motorcycles, focusing on statistical modelling based on engine parameters. The problem at hand is rooted in the adverse effects of pulsations on the differential pressure-based measurement method used in the EFM. The unfavorable combination of engine characteristics specific to motorcycles necessitates a novel approach. Our proposed alternative involves utilizing readily available OBD parameters, namely engine speed and calculated engine load as there is mostly no data for intake
Schurl, Sebastian, Sturm, Stefan, Schmidt, Stephan, Kirchberger, Roland
Detailed Approach for Pre-Chamber Heat Release Analysis for the HSASI Pre-Chamber Spark Plug Using a Pressure Sensor Glow Plug2024-32-006304/18/2025
The hot surface-assisted spark ignition (HSASI) pre-chamber spark plug, which was developed at the Karlsruhe University of Applied Sciences, increases the dilution limit with excess air and the tolerance to residual gas in the pre-chamber compared to a conventional passive pre-chamber spark plug. In this study, the conventional glow plug which is integrated in the pre-chamber of the HSASI pre-chamber spark plug was replaced by a pressure sensor glow plug (PSG) from BERU. This allows for a detailed combustion analysis in the pre-chamber. The signal of the PSG was validated with a piezoelectric cylinder pressure sensor and a method to analyse the pre-chamber heat release was introduced. Experimental investigations were carried out on a single-cylinder gasoline engine. A series of operating points diluted with excess air and a variation in load were conducted. The gas flow rate through the orifices of the pre-chamber was calculated from the pressure difference between the pre-chamber and
Holzberger, Sascha, Kettner, Maurice, Kirchberger, Roland
Enhancing Low Temperature Lean Combustion of CH4-H2 Blends through a Prechamber Equipped Engine2024-32-004404/18/2025
The use of hydrogen as a sustainable fuel in the short term is hampered by the impossibility of large scale use due low availability. In order to promote decarbonization, complementary solution for a smooth transition is to dilute it in a mixture with methane, in a current Port Fuel Injection (PFI) internal combustion engine (ICE). This can be done as a retrofit after limited structural modifications, such as the introduction of a passive prechamber. Such a solution allows a reduction of the carbon footprint of traditional ICEs through more efficient combustion (both the prechamber technology and the hydrogen fuel properties promote an increase in combustion speed) and a reduced carbon content in the fuel. The present research activity has been carried out through numerical investigation based on three-dimensional CFD analyses to simulate the behavior of a natural gas engine fueled with CH4-H2 blends. The combustion mechanism for the fuel blend was validated against measurements of the
Balduzzi, Francesco, Ferrara, Giovanni, Di Iorio, Silvana, Sementa, Paolo
Development of Higher Clarity Injection Molded Windscreen for Motorcycles2024-32-004004/18/2025
The windscreen is one of the key elements to enhance passenger comfort of touring motorcycle. The clarity through the windscreen should not discomfort the rider. The discomfort we discuss here mainly refers to three factors: the “distortion,” the “blur,” and the “transparency.” Introduced in this paper is the technical measures to achieve sufficient clarity by the injection molding method. Firstly, with respect to the “distortion,” we determined the main cause was local unevenness of plate thickness. As the uneven thickness were related to the accuracy of the die, we clarified the tolerable zone and carried out higher precision machining of the die to satisfy the requirements. Regarding the “blur,” we analyzed the refractive power of the windscreen and found the main cause of blur is the microscopic roughness on the surface. As the microscopic roughness were attributable to the die surface, we clarified the tolerable zone and established the polishing conditions satisfactory for the
Yamada, Atsushi, Endo, Sakae
Studying the Lean Burn Operation in Two-Wheelers to Increase Fuel Efficiency and Investigate the Use of Lean NOx Trap Catalyst (LNT) for Lean Burn System2024-32-005804/18/2025
This study offers an overview of the impact of lean burn technology in two-wheeler vehicles, specifically concentrating on enhancing the fuel economy and addressing the challenges associated with its adoption. Lean burn systems, characterized by a fuel-air mixture with a higher air content than stoichiometric ratio. The study focuses on technology which meets stringent emission standards while enabling the optimization of fuel efficiency. The lean burn system employs strategies to optimize air-fuel ratio using electronic fuel injection, ignition timing control, and advanced engine control algorithms like - updated torque modulation control algorithm for drivability, lambda control algorithm for rich and lean switch and NOx modelling algorithm for LNT catalyst efficiency tracking. The challenges related to lean burn systems, includes issues related to combustion stability, nitrogen oxide (NOx) emissions, and their impact on drivability, is summarized in the study. Mitigation strategies
Somasundaram, Karthikeyan, Sivaji, Purushothaman, John Derin, C, Vishal, Karwa, Manoj Kumar, S, Maynal, Rajesh
DoE-Based Numerical Optimization of Intake and Exhaust Port Geometry of a Small Opposed-Piston 2-Stroke (OP2S) Hydrogen Engine2024-32-005404/18/2025
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.
Statistical Analysis of Data Acquired from Propagating Flames in Gasoline Engines Using a Multiple Ion Probe2024-32-003504/18/2025
Multiple-ion-probe method consists of multiple ion probes placed on the combustion chamber wall, where each individual ion probe detects flame contact and records the time of contact. From the recorded data, it is also possible to indirectly visualize the inside of the combustion chamber, for example, as a motion animation of moving flame front. In this study, a thirty-two ion probes were used to record flames propagating in a two-stroke gasoline engine. The experiment recorded the combustion state in the engine for about 3 seconds under full load at about 6500 rpm, and about 300 cycles were recorded in one experiment. Twelve experiments were conducted under the same experimental conditions, and a total of 4,164 cycles of signal data were obtained in the twelve experiments. Two types of analysis were performed on this data: statistical analysis and machine learning analysis using a linear regression model. Statistical analysis calculated the average flame detection time and standard
Yatsufusa, Tomoaki, Okahira, Takehiro, Nagashige, Kohei
Study on Motorcycle Rider Model Using Reinforcement Learning - Learning Examples Including Following Target Velocity and Basic Research on Rider Proficiency2024-32-002804/18/2025
In this study, an initial approach using deep reinforcement learning to replicate the complex behaviors of motorcycle riders was presented. Three learning examples were demonstrated: following a target velocity, maintaining stability at low speeds, and following a target trajectory. These examples serve as a starting point for further research. Additionally, the proficiency of the constructed models was examined using rider proficiency evaluation methods developed in previous studies. Initial results indicated that the models have the potential to mimic real rider behaviors; however, challenges such as differences between the model’s output and what humans can produce were also identified for future work.
Mitsuhashi, Yasuhiro, Momiyama, Yoshitaka, Yabe, Noboru
Representative Point of Measurement of Engine ECU and Effect of Vortices and Ambient Wall on Forced Air-Cooling2024-32-003604/18/2025
The Electric Control Unit (ECU) is a crucial computing unit responsible for engine regulating various functions. However, non-airflow thermal design due to the complexity of engine bay turbulent flow simulation is limiting ECU’s potential with the increasing demand of computation power consumption, thermal design faced additional challenges. Moreover, the lack of standardized ECU design guidelines forced substantial investments in customized thermal solutions for different engine bay packaging. Through this research, the method of finding representative points of ambient temperature efficiently and reliably is investigated, so that thermal design can be achieved by estimating flow properties during the ECU design stage efficiently. This research involves studying the effects of airflow on ECU cooling using experimental and numerical analysis in Computational Fluid Dynamics (CFD). Alongside the representative points of ambient temperature uncovered from the numerical result
Zhong, Jiajun, Inaba, Kazuaki, Yamaguchi, Ryota, Yasui, Ryuta, Umeno, Masafumi
RDE Methodology Development for Motorcycle Emissions Assessment2024-32-007304/18/2025
The transfer of conditions and regulations for RDE testing from passenger cars to motorcycles is a non-trivial undertaking. Motorcycles exhibit significant differences in construction and usage compared to cars, necessitating a distinct set of requirements for equipment and methodology. Currently available PEMS are hindered by their relatively large size and weight due to the embedded measurement technology and external power supply. The weight of, at least 50kg, poses a substantial additional load, leading to a deviation and, on average, higher load collective of the engine during RDE measurement rides. Beyond these structural parameters, the actual propulsion system and subsequent exhaust system introduce another challenge when employing PEMS on motorcycles. An unfavorable combination of the ratio of engine displacement to the volume of the exhaust system and long or unequal ignition intervals leads to pulsations, which has a considerable impact on the differential pressure-based
Schurl, Sebastian, Keller, Stefan, Lankau, Mathias, Hafenmayer, Christian, Schmidt, Stephan, Kirchberger, Roland
Fuel Film Measurement in a SI Gasoline Engine Using a Newly Developed MEMS Sensor2024-32-007104/18/2025
The previously developed capacitance sensor for detecting a liquid fuel film was modified to apply to the in-cylinder measurement. On the developed sensor surface, comb-shaped electrodes were circularly aligned. The capacitance between the electrodes varies with the liquid fuel film adhering. The capacitance variation between the electrodes on the sensor surface was converted to the frequency variation of the oscillation circuit. In the previous study, it was revealed that the frequency of the oscillation circuit varies with the variation of the liquid fuel coverage area on the sensor surface. The developed sensor was installed in the combustion chamber of the rapid compression and expansion machine, and the performance of the developed sensor was examined. Iso-octane was used as a test fuel to explore the sensor that had been developed. As a result, the adherence of the liquid fuel directly injected into the cylinder was successfully detected under the quiescent and motoring
Kuboyama, Tatsuya, Moriyoshi, Yasuo, Takayama, Satoshi, Nakabeppu, Osamu
Mixed Wettability Influence on Water Droplet Behaviour in a PEM Fuel Cell Channel2024-32-003704/18/2025
The utilization of hydrogen in low-temperature Proton Exchange Membrane Fuel Cells (PEMFCs) stands out as a compelling prospect for driving a widespread shift towards green industry practices. Despite significant advancements, a comprehensive understanding of water behaviour and dynamics within PEMFCs remains crucial for their extensive integration in propulsion applications. Striking a delicate balance between flooding and drying conditions poses a challenge for achieving stable and efficient PEMFC operation. In this study, a preliminary experimental investigation was conducted focusing on carbon-paper Gas Diffusion Layer (GDL) and gas channel walls. The static, advancing and receding contact angles were measured and utilized as boundary conditions for simulations. The influence of membrane humidity was also examined during the experimental campaign. 3D CFD simulations were performed on a straight portion of a PEMFC channel with a selected domain length of 5 mm and a section of 1x1 mm
Merola, S. S., Antetomaso, C., Irimescu, A., Vaglieco, B. M., Jannelli, E.
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