A5055282803- Advanced Combustion Engine Technologies
- Combustion and flame dynamics
- Biodiesel Production and Applications
- Vehicle emissions and performance
- Radiation Effects in Electronics
- Combustion and Detonation Processes
- VLSI and Analog Circuit Testing
- Integrated Circuits and Semiconductor Failure Analysis
- Physical Unclonable Functions (PUFs) and Hardware Security
- Advancements in Photolithography Techniques
- Formal Methods in Verification
- 3D IC and TSV technologies
- Heat transfer and supercritical fluids
- Software Testing and Debugging Techniques
- Catalytic Processes in Materials Science
- Thermochemical Biomass Conversion Processes
- Catalysis for Biomass Conversion
- Software Reliability and Analysis Research
- Rocket and propulsion systems research
- Security and Verification in Computing
- Lubricants and Their Additives
- Privacy, Security, and Data Protection
- Silicon and Solar Cell Technologies
- CCD and CMOS Imaging Sensors
- Vehicle Noise and Vibration Control
Sandia National Laboratories
2022-2024
King Abdullah University of Science and Technology
2016-2023
Sandia National Laboratories California
2022-2023
Google (United States)
2023
Stanford University
2011-2020
Infineon Technologies (Germany)
2020
Indian Institute of Petroleum
2013-2017
University of Science and Technology
2017
Intel (United States)
2014
Intel (United Kingdom)
2012
Gasoline octane number is a significant empirical parameter for the optimization and development of internal combustion engines capable resisting knock. Although extensive databases blending rules to estimate numbers mixtures have been developed effects molecular structure on autoignition properties are somewhat understood, comprehensive theoretical chemistry-based foundation fuels engine operations still be developed. In this study, we present models that correlate research (RON) motor...
Pre-chamber spark ignition (PCSI) combustion is an emerging leanburn mode capable of extending the lean operation limit engine.The favorable characteristic short duration at condition PCSI results in high efficiencies compared to conventional combustion.Since engine typically lean, can significantly reduce engine-out NOx emissions while maintaining durations.In this study, experiments were conducted on a heavyduty conditions mid low load.Two major studies performed.In first total fuel energy...
Continued economic growth is accelerating the demand for transport energy in road, aviation, and marine sectors. The environmental impacts of technologies across these sectors need significant attention if society to meet its climate change mitigation targets. Current policies focusing entirely on electrification are shown be insufficient mitigating impacts. Powertrains equipped with combustion engines will still operational 2040 onwards, especially developing countries currently...
<div class="section abstract"><div class="htmlview paragraph">Methanol emerges as a compelling renewable fuel for decarbonizing engine applications due to mature industry with high production capacity, existing distribution infrastructure, low carbon intensity and favorable cost. Methanol’s flame speed autoignition resistance render it particularly well-suited spark-ignition (SI) engines. Previous research showed distinct phenomenon, known deflagration-based knock in methanol...
Synergistic octane blending behavior of ethanol with gasoline and its surrogates has been observed by many researchers. The nonlinear boosting tendency is at mid high molar blends in primary reference fuels. present work aims to provide chemical insight into this ignition processes when blended To end, delay time (IDT) calculations, using a well-validated mechanism, were performed for several fuel iso-octane, n-heptane, ethanol. Temperature pressure values found, correlating experimentally...
The blending of ethanol with primary reference fuel (PRF) mixtures comprising n-heptane and iso-octane is known to exhibit a non-linear octane response; however, the underlying chemistry intermolecular interactions are poorly understood.Well-designed experiments numerical simulations required understand these effects chemical kinetic phenomenon responsible for them.To this end, HCCI engine were previously performed at four different conditions intake temperature speed various PRF/ethanol...
We present Symbolic Quick Error Detection (Symbolic QED), a structured approach for logic bug detection and localization which can be used both during pre-silicon design verification as well post-silicon validation debug. This new methodology leverages prior work on (QED) has been demonstrated to drastically reduce the latency, in terms of number clock cycles, error following activation (or electrical) bug. QED works through software transformations, including redundant execution control...
During post-silicon validation and debug, manufactured integrated circuits (ICs) are tested in actual system environments to detect fix design flaws (bugs). Existing debug techniques mostly ad hoc often involve manual steps. Such approaches cannot scale with increasing IC complexity. We present Symbolic Quick Error Detection (Symbolic QED), a structured approach debug. QED combines the following steps coordinated fashion: 1. (QED) tests that quickly bugs short error detection latencies high...
Three-dimensional Stacked Integrated Circuit packages interconnected using high speed Through-Silicon Via technology can be efficiently manufactured a wafer-to-wafer stacking process. Efforts to mitigate degradation in the composite yield of stacked die are primarily focused on matching defect maps while assigning pre-tested wafers from available wafer repository individual stacks. In this paper we show how rotational symmetry exploited increase number by factor four, thereby significantly...
Fuel injection strategies often have a considerable impact on pre-ignition in high specific output gasoline engines. Splitting the event into two or more pulses has been widely explored as one means of reducing pre-ignition. As effective these can be with respect to suppression, they introduce other compromises combustion process, for example, reduced indicated mean pressure greater cycle-to-cycle variation. This study examines split strategy up three suppressing pre-ignition, while...
Improving the efficiency of internal combustion engines is important for reducing global greenhouse gas emissions; spark ignition (SI) limited by knock phenomenon. As opposed to naturally aspirated engines, turbocharged operate at beyond research octane number (RON) conditions, and fuel sensitivity (OS = RON – motor (MON)) becomes under such conditions. Previous work this group [ Energy Fuels 2017, 31, 1945−1960, DOI: 10.1021/acs.energyfuels.6b02659] elucidated chemical kinetic origins OS;...
Abstract Dilute combustion in spark-ignition engines has the potential to improve thermal efficiency by mitigating knock and reducing throttling wall heat losses. However, ignition processes can become unstable for dilute operation due a lowered laminar flame speed, resulting excessive cycle-to-cycle variability (CCV) of process. To compensate slower less reactive mixtures, modified intake port geometry be employed generate strong tumble flow cylinder elevate turbulence levels around spark...