A5089318617- Advanced Battery Technologies Research
- Advanced Combustion Engine Technologies
- Advancements in Battery Materials
- Fuel Cells and Related Materials
- Electric and Hybrid Vehicle Technologies
- Combustion and flame dynamics
- Vehicle emissions and performance
- Advanced Battery Materials and Technologies
- Electrocatalysts for Energy Conversion
- Real-time simulation and control systems
- Electric Vehicles and Infrastructure
- Advancements in Solid Oxide Fuel Cells
- Hydraulic and Pneumatic Systems
- Vehicle Dynamics and Control Systems
- Advanced Control Systems Optimization
- Biodiesel Production and Applications
- Catalytic Processes in Materials Science
- Fault Detection and Control Systems
- Membrane-based Ion Separation Techniques
- Iterative Learning Control Systems
- Extremum Seeking Control Systems
- Traffic control and management
- Control Systems and Identification
- Engine and Fuel Emissions
- Combustion and Detonation Processes
University of Michigan
2016-2025
Battery Park
2022-2023
University of California, Santa Barbara
1998-2022
Imperial College London
2018-2022
Michigan United
2006-2022
Purdue University West Lafayette
2018-2022
University of California, Riverside
2022
Conference Board
2018-2019
University of California, Irvine
2018-2019
Georgia Institute of Technology
2018-2019
In this article we analyzed and designed air flow controllers that protect the fuel cell (FC) stack from oxygen starvation during step changes of current demand. The steady-state regulation excess ratio in FCS cathode achieved by assigning an integrator to compressor flow. Linear observability techniques were employed demonstrate improvements transient when voltage is included as a measurement for feedback controller. signal contains high frequency information about FC utilization, thus,...
Fuel Cells are electrochemical devices that convert the chemical energy of a gaseous fuel directly into electricity. They widely regarded as potential future stationary and mobile power source. The response cell system depends on air hydrogen feed, flow pressure regulation, heat water management. In this paper, we develop dynamic model suitable for control study systems. transient phenomena captured in include inertia dynamics compressor, manifold filling (both anode cathode), reactant...
Good estimates of vehicle mass and road grade are important in automation heavy duty vehicles, following manoeuvres or traditional powertrain control schemes. Recursive least square (RLS) with multiple forgetting factors accounts for different rates change parameters thus, enables simultaneous estimation the time-varying piece-wise constant mass. An ad hoc modification update law gain RLS scheme is proposed used simulation experiments. We demonstrate that within 5% its actual value tracks...
This paper presents a numerical calculation of the evolution spatially resolved solid concentration in two electrodes lithium-ion cell. The microscopic is driven by macroscopic Butler–Volmer current density distribution, which consequently applied through boundary conditions. resulting, mostly causal, implementation algebraic differential equations that describe battery electrochemical principles, even after assuming fixed electrolyte concentration, high order and complexity denoted as full...
Lithium ion batteries should always be prevented from overheating and, hence, thermal monitoring is indispensable. Since only the surface temperature of battery can measured, a model needed to estimate core battery, which higher and more critical. In this paper, an online parameter identification scheme designed for cylindrical lithium battery. An adaptive observer then based on parameterization methodology measurement. A with constant internal resistance explored first. The algorithm...
Lithium-ion batteries can last many years but sometimes exhibit rapid, nonlinear degradation that severely limits battery lifetime. In this work, we review prior work on “knees” in lithium-ion aging trajectories. We first definitions for knees and three classes of “internal state trajectories” (termed snowball, hidden, threshold trajectories) cause a knee. then discuss six knee “pathways”, including lithium plating, electrode saturation, resistance growth, electrolyte additive depletion,...
Li-ion battery thermal runaway is a critical safety issue for Electric Vehicles. The proposed global technical regulation No. 20 by the United Nations on Vehicle Safety requires an advanced warning 5 minutes prior to evolution of hazardous conditions caused runaway. To achieve this 5-min warning, robust and sensitive detection methodology required. Gas venting often precursor runaway, therefore use gas-based method was evaluated in paper explore its response implementation within pack....
A nonlinear fuel cell system dynamic model that is suitable for control study presented. The transient phenomena captured in the include flow characteristics and inertia dynamics of compressor, manifold filling dynamics, consequently, reactant partial pressures. Characterization polarization curves based on time varying current, oxygen hydrogen pressures, temperature, membrane hydration allows analysis simulation power generation. An observer feedback feedforward controller manages tradeoff...
The problem of oxygen starvation in fuel cells coupled with air compressor saturation limits, is addressed this paper. We propose using a hybrid configuration, which bank ultracapacitors supplements the polymer electrolyte membrane cell during fast current transients. Our objective to avoid starvation, prevent surge and choke, simultaneously match an arbitrary level demand. formulate distribution demand between model predictive control framework, can handle multiple constraints system....
The emission control problem for an automotive direct injected compression ignition (diesel) engine equipped with exhaust gas recirculation (EGR) and a variable geometry turbocharger (VGT) is considered. objective to operate the meet driver's torque demand minimize NO/sub x/ emissions while at same time avoiding visible smoke generation. It demonstrated that steady-state optimization of results in operating points where EGR VGT actuators are effect redundant their on variables most directly...
Variable-geometry turbochargers (VGTs) are employed in high-end diesel engines. These VGTs also help controlling the trade-offs emissions performance. Exhaust gas recirculation (EGR) is used to dilute combustion mixture, resulting lower peak temperatures and a oxygen concentration hence NOx emissions. In this article, we compare some of control methodologies previously presented not yet evaluate their benefits experimentally. We do include any new theory. Rather refer other sources for...
Lithium-ion battery is the core of new plug-in hybrid-electrical vehicles (PHEV) as well considered in many 2nd generation hybrid electric (HEV). In most cases lithium-ion performance plays an important role for energy management these high-rate transient power source cycling around a relatively fixed state charge (SOC). this paper averaged electrochemical model suitable estimation presented. The based on approximated relationship between (i) Butler-Volmer current and solid concentration at...
The estimation of temperature inside a battery cell requires accurate information about the cooling conditions even when surface is measured. This paper presents model-based approach for estimating distribution cylindrical under unknown convective conditions. A reduced-order thermal model using polynomial approximation profile used. dual Kalman filter (DKF), combination and an extended filter, then applied identification convection coefficient core temperature. properties are modeled by...
Supercapacitors benefit from unique features including high power density, long cycle life, wide temperature operation range, durability in harsh environments, efficient cycling, and low maintenance cost. This paper presents a validated lumped computationally electrical thermal model for cylindrical supercapacitor cell. The is two-state equivalent electric circuit with three parameters that are identified using temporal experiments. dependence of the on state charge, current direction...
This paper shows how neutron radiography can be used for in situ quantification of the lithium concentration across battery electrodes, a critical physical system state. The change between charged and discharged states causes number detected neutrons after passing through battery. Electrode swelling is also observed during charging. experimental setup observations from testing pouch cell with LFP cathode graphite anode are reported here. bulk Li electrode folds quantified at various charge....
The expansion of battery material during lithium intercalation is a concern for the cycle life and performance ion batteries. In this paper, electrode quantified from in situ neutron images taken cycling pouch cells with iron phosphate positive graphite negative electrodes. Apart confirming overall as function state charge correlation transitions that have been observed previous dilatometer experiments we show spatial distribution along individual electrodes cell. were performed on two...