Estimating the State-of-Charge of Lithium-Ion Batteries Using an H-Infinity Observer with Consideration of the Hysteresis Characteristic

Jiale Xie,Jiachen Ma,Yude Sun,Zonglin Li 전력전자학회 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.2

The conventional methods used to evaluate battery state-of-charge (SOC) cannot accommodate the chemistry nonlinearities, measurement inaccuracies and parameter perturbations involved in estimation systems. In this paper, an impedance-based equivalent circuit model has been constructed with respect to a LiFePO₄ battery by approximating the electrochemical impedance spectrum (EIS) with RC circuits. The efficiencies of approximating the EIS with RC networks in different series-parallel forms are first discussed. Additionally, the typical hysteresis characteristic is modeled through an empirical approach. Subsequently, a methodology incorporating an H-infinity observer designated for open-circuit voltage (OCV) observation and a hysteresis model developed for OCV-SOC mapping is proposed. Thereafter, evaluation experiments under FUDS and UDDS test cycles are undertaken with varying temperatures and different current-sense bias. Experimental comparisons, in comparison with the EKF based method, indicate that the proposed SOC estimator is more effective and robust. Moreover, test results on a group of Li-ion batteries, from different manufacturers and of different chemistries, show that the proposed method has high generalization capability for all the three types of Li-ion batteries.

Estimating the State-of-Charge of Lithium-Ion Batteries Using an H-Infinity Observer with Consideration of the Hysteresis Characteristic

Xie, Jiale,Ma, Jiachen,Sun, Yude,Li, Zonglin The Korean Institute of Power Electronics 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.2

The conventional methods used to evaluate battery state-of-charge (SOC) cannot accommodate the chemistry nonlinearities, measurement inaccuracies and parameter perturbations involved in estimation systems. In this paper, an impedance-based equivalent circuit model has been constructed with respect to a LiFePO₄ battery by approximating the electrochemical impedance spectrum (EIS) with RC circuits. The efficiencies of approximating the EIS with RC networks in different series-parallel forms are first discussed. Additionally, the typical hysteresis characteristic is modeled through an empirical approach. Subsequently, a methodology incorporating an H-infinity observer designated for open-circuit voltage (OCV) observation and a hysteresis model developed for OCV-SOC mapping is proposed. Thereafter, evaluation experiments under FUDS and UDDS test cycles are undertaken with varying temperatures and different current-sense bias. Experimental comparisons, in comparison with the EKF based method, indicate that the proposed SOC estimator is more effective and robust. Moreover, test results on a group of Li-ion batteries, from different manufacturers and of different chemistries, show that the proposed method has high generalization capability for all the three types of Li-ion batteries.

Sensorless Control of the Switched Reluctance Motor Based on the Sliding-Mode Observer

Li Xinyu,Liu Jiayu,Ge Lefei,Zhong Jixi,Huang Jiale,Zhao Yuchen,Song Shoujun 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.2

To upgrade the application of switched reluctance motors (SRMs) for more electric aircraft, this paper presents a method with sensorless control based on the flux-linkage data from the finite element method. First, a calibration strategy is employed to obtain the flux-linkage characteristics. Then, a sliding-mode observer is used to realize the sensorless control of the SRM. The proposed method only requires the flux-linkage of the SRM at aligned and unaligned rotor positions from the experiment which takes a low-measurement effort to get the rotor position and has better accuracy in position and speed estimation than the FEM. Experimental results verify the accuracy and effectiveness of the proposed method.

Adaptive Consensus of Nonlinear MASs with Event-triggered Updating Algorithm

Jiale Yi,Jing Li,Zhaohui Zhang,Xiaobo Li 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.2

This paper investigates the consensus problem for a class of nonlinear leader-follower multi-agent systems with event-triggered updating algorithm. Unlike the most existing event-triggered control protocols, the controllers and parameter update laws are event-triggered and transmitted simultaneously by a composite eventtriggered condition. An exponential term of consensus errors is constructed novelly in the event-triggered condition to exclude Zeno behavior and decrease the number of events. Moreover, the stability of the closed-loop system is proved by using the Lyapunov stability theory. At the same time, all the signals in the closed-loop systems are globally bounded and the consensus errors converge to a small neighborhood of origin exponentially under the proposed control schemes. Finally, numerical simulation results illustrate the effectiveness of the proposed control schemes.

Fabrication of porous metal fiber sintered sheet as a flow field for proton exchange membrane fuel cell

Li Shuangli,Zhou Wei,Liu Ruiliang,Huang Jiale,Chu Xuyang 한국물리학회 2020 Current Applied Physics Vol.20 No.5

To improve the diffusion performance of reactive gas, a porous copper fiber sintered sheet (PCFSS) was fabricated and used as the flow field for proton exchange membrane fuel cell (PEMFC). The pressure and flow velocity distribution of the reaction gas in the PCFSS was firstly compared with the serpentine flow field by using the Fluent simulation software. Our results showed that the superiority of PCFSS in the uniformity of gas diffusion was observed. The total resistance of PEMFC with PCFSS in different porosities was obtained. And the advantages of PCFSS in electronic transmission were found by comparing with the serpentine flow field. Besides, the influences of different operating conditions and different porosities of porous flow fields on the performance of PEMFC were experimentally investigated. With the cell temperature of 70 °C as well as the humidification temperature of 60 °C, a PEMFC with PCFSS of 70% porosity exhibited better performance.

Mechanical Properties of Desert-Sand-Based Steel-PVA Hybrid Fiber Reinforced Engineered Cementitious Composites (H-DSECC)

Jialing Che,Ziwei Guo,Quanwei Li,Haifeng Liu 대한토목학회 2022 KSCE Journal of Civil Engineering Vol.26 No.12

At present, the exploitation of river sand is forbidden because of the harm to the environment. The production processes of microsilica sand are complicated and the cost is high. The excellent availability of desert sand provides a practical solution for using it as the aggregate, this research used high-volume fly ash, steel fiber, PVA fiber and some or all of the Mu Us desert sand to replace the river sand to prepare the Desert-Sand-based steel-PVA hybrid Fiber Reinforced ECC (H-DSECC) that meets the performance requirements. Through the single factor test, the steel fiber replacement rate and the desert sand replacement rate were taken as the main factors, and the mechanical properties of H-DSECC were initially explored. The results show that the high steel fiber replacement rate or high desert sand replacement rate is not conducive to the realization of strain-hardening. An H-DSECC mixture containing 40% desert sand with W/B ratio of 0.29 has delivered the best properties with the tensile strain capacity of 1.467%, the tensile strength is 7.5 MPa and the cylinder compressive strength is 41.03 MPa at 28 days. Based on the measured stress-strain curves, the uniaxial tension/compression stress-strain curve equations are proposed.

One-Step Hydrothermal Deposition of Ag-Doped g-C3N4-TiO2 Nanocomposites on Cotton Fabric Surface with Enhanced Photocatalytic Activity

Wenjun Li,Hui Zhang,Pei Chen,Jiale Yao,Xiangzhi Dong 한국섬유공학회 2023 Fibers and polymers Vol.24 No.2

In this study, Ag-doped g-C3N4-TiO2 nanocomposite photocatalysts were deposited on the surface of cotton fabric by a simpleone-step hydrothermal method. The structure features of as-modified cotton fabric were examined by a series of characterizationtechniques, including scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction(XRD) spectroscopy, X-ray photoelectron spectroscopy (XPS), UV–Vis diffuse reflectance spectroscopy (DRS) andphotoluminescence spectroscopy (PL). The experimental results showed that highly dispersed Ag nanoparticles were dopedinto g-C3N4-TiO2 nanocomposites which were evenly coated on the fabric surface. The introduction of Ag nanoparticles intog-C3N4-TiO2 composites could significantly improve the photodegradation rate of methyl orange (MO) dye under visiblelight irradiation. Importantly, the doping site of Ag nanoparticles had a significant influence on the photocatalytic activityof Ag-doped g-C3N4-TiO2 nanocomposites. Compared with the g-C3N4-TiO2 coated cotton fabric, the Ag-doped g-C3N4-TiO2 coated cotton fabric displayed excellent photocatalytic properties for the photodegradation of MO dyes because of thenarrowed band gap and the faster separation and transfer of photoinduced charge carriers. The substrate of cotton fabric hadlittle influence on the active radicals produced by the Ag-doped g-C3N4-TiO2 nanocomposites. In addition, the as-modifiedcotton fabric exhibited good reusability and stability after five recycles for the photodegradation of MO dyes.

Immunomodulatory biomaterials for implant-associated infections: from conventional to advanced therapeutic strategies

Dong Jiale,Wang Wenzhi,Zhou Wei,Zhang Siming,Li Meng,Li Ning,Pan Guoqing,Zhang Xianzuo,Bai Jiaxiang,Zhu Chen 한국생체재료학회 2023 생체재료학회지 Vol.27 No.00

Implant-associated infection (IAI) is increasingly emerging as a serious threat with the massive application of biomaterials. Bacteria attached to the surface of implants are often difficult to remove and exhibit high resistance to bactericides. In the quest for novel antimicrobial strategies, conventional antimicrobial materials often fail to exert their function because they tend to focus on direct bactericidal activity while neglecting the modulation of immune systems. The inflammatory response induced by host immune cells was thought to be a detrimental force impeding wound healing. However, the immune system has recently received increasing attention as a vital player in the host’s defense against infection. Anti-infective strategies based on the modulation of host immune defenses are emerging as a field of interest. This review explains the importance of the immune system in combating infections and describes current advanced immune-enhanced anti-infection strategies. First, the characteristics of traditional/conventional implant biomaterials and the reasons for the difficulty of bacterial clearance in IAI were reviewed. Second, the importance of immune cells in the battle against bacteria is elucidated. Then, we discuss how to design biomaterials that activate the defense function of immune cells to enhance the antimicrobial potential. Based on the key premise of restoring proper host-protective immunity, varying advanced immune-enhanced antimicrobial strategies were discussed. Finally, current issues and perspectives in this field were offered. This review will provide scientific guidance to enhance the development of advanced anti-infective biomaterials.

Preparation and Characterization of a pH-responsive Polymer that Interacts with Microbial Transglutaminase during Affinity Precipitation

Sipeng Li,Jialing Chen,Xuanjun Zhang,Zhaoyang Ding,Xuejun Cao 한국생물공학회 2018 Biotechnology and Bioprocess Engineering Vol.23 No.1

Microbial transglutaminase (MTG) has been widely used in the food and pharmaceuticals industries. In this study, MTG was purified using affinity precipitation with an affinity polymer (PMMDN-T), which was synthesized using a pH-responsive polymer (PMMDN) coupled with L-thyroxin as an affinity ligand. Interactions between MTG and PMMDN-T were investigated using turbidimetric titration, zeta potential measurements, and low-field nuclear magnetic resonance (LF-NMR). We found different behaviors, architectures, and phase states of pH-dependent interactions between MTG and PMMDN-T interactions. Binding energetics between MTG and PMMDN-T were determined by isothermal titration calorimetry (ITC). The isoelectric point (pI) of the affinity polymer was 4.65 and was recovered with 96.7% efficiency after recycling the polymer three times. The optimal adsorption condition was 0.02 mol/L phosphate buffer (pH 6.0) with 1.0 mol/L NaCl at 30.0°C and a ligand density of 50.0 μmol/g. The maximum elution recoveries of total MTG were 98.44% (protein) with 92.19% (activity) using 0.02 mol/L pH 10.0 Gly-NaOH as the eluent.

Ethanol dry reforming over ordered mesoporous Co-Zn composite oxide for syngas production

Feifei Li,Jiale Dong,Mingyue Wang,Xingtao Lin,Weijie Cai,Xianyun Liu 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.7

This work is mainly concerned with the synthesis of Co-Zn nanocomposites by employing MCM-41 silicaas hard template (CoZnO-HT) and its catalytic behavior toward to CO2 reforming with ethanol. The physicochemicalfeatures of the as-prepared catalysts were probed through various characterization techniques, including XRD, TEM,BET, H2-TPR, and XPS. Indeed, CoZnO-HT catalyst possessed a highly ordered mesostructure with similarity toMCM-41 template and a higher specific surface area (304m2/g) compared to the reference CoZnO-C sample (4.75m2/g) prepared by the conventional impregnation method. Consequently, CoZnO-HT exhibited good performance at lowtemperature, and full ethanol conversion could be achieved at 550 oC as well as the negligible formation of byproductacetone. In addition, this catalyst depicted good stability and no obvious deactivation was observed after 40 h time onstream tests under the stoichiometric feed ratio. Indeed, superior specific surface area and efficient mass transportwithin the mesopores might be critical factors assigned to better activity and stability for CoZnO-HT.