Hubei Collaborative Innovation Center for Automotive Components Technology
Hubei Collaborative Innovation Center for Automotive Components Technology
Hou J.,Hubei University of Automotive Technology |
Hou J.,Hubei Collaborative Innovation Center for Automotive Components Technology |
Yan F.,Hubei University of Automotive Technology |
Yan F.,Hubei Collaborative Innovation Center for Automotive Components Technology |
And 4 more authors.
Energy and Fuels | Year: 2017
Computational investigation was carried out in an optical constant volume chamber to explore the combined effects of initial ambient temperatures (800, 900, and 1000 K) and n-butanol additive (20% volume fraction of n-butanol) on diesel combustion and soot characteristics. An improved phenomenological soot model integrated with a reduced n-heptane/n-butanol/polycyclic aromatic hydrocarbon (PAH) mechanism was developed and implemented into the KIVA-3V R2 code to study the soot formation and oxidation mechanism. The predicted chamber pressure and heat release rate as well as soot mass trace and distribution showed good agreements with the experimental data. Results indicated that the ignition delay was retarded and total soot mass was reduced with the decrease of initial ambient temperature and with the n-butanol additive. The heat release rate of pure diesel demonstrated a transition from diffusion-dominated combustion at 1000 K to premix-dominated combustion at 800 K. Diesel/n-butanol blend showed no obvious combustion transition but more intensive premixed combustion with the decrease of initial ambient temperatures. Analysis of soot intermediate species of pure diesel and diesel/n-butanol blend revealed that the soot formation and oxidation mechanism were both restrained at lower initial ambient temperatures. The soot formation of diesel/n-butanol blend was weaker than that of pure diesel, however, the soot oxidation remained the same level for both fuels varying with the initial ambient temperatures. The quantitative and spatial distribution analysis indicated that the suppressed formation mechanism of soot and its intermediate species would play a leading role in the reduction of soot with decreasing initial ambient temperatures and with the n-butanol additive, which can be explained by the shrinking of high-temperature and fuel-rich zone. © 2016 American Chemical Society.
Bi J.,CAS Shanghai Institute of Applied Physics |
Bi J.,Hubei University of Automotive Technology |
Yang S.,Hubei University of Automotive Technology |
Yang S.,Hubei Collaborative Innovation Center for Automotive Components Technology |
And 7 more authors.
Journal of Power Sources | Year: 2017
Here, effects of B-site transition metals (TMs) in the (La0.6Sr0.4)XO3-δ (X = Mn, Fe, Co) perovskite structure on the activity and stability of the oxygen electrodes during high temperature electrolysis are discussed to provide a deep understanding of the phenomena observed for different oxygen electrodes under anodic polarizations. Performance and stability of the electrodes vary significantly at 800 °C as the TMs changed from Mn to Fe and Co, which is attributed to the different ionic conductivities and surface chemistry of the materials that have a strong dependence on the valence state and electronic structure of TMs. Under an anodic current passage of 200 mA cm−2 at 800 °C, electrode polarization resistance (RE) and overpotential (η) of the (La0.6Sr0.4)MnO3-δ (LSM) electrode decrease significantly by 1.75 Ω cm2 and 101 mV during the 1200 min test, compared with the constant values of RE and η for the (La0.6Sr0.4)FeO3-δ (LSF) and (La0.6Sr0.4)CoO3-δ (LSC) electrodes, an indication of the influence of B-site TMs on the electrode performance and stability. Most serious degradation is observed at the (La0.6Sr0.4)MnO3-δ electrode due to the electrode detachment arising from the accelerated SrO surface segregation and related disintegration of LSM particles near the electrode/electrolyte interface. © 2017 Elsevier B.V.
Wei M.,Hubei University of Automotive Technology |
Wei M.,Hubei Collaborative Innovation Center for Automotive Components Technology |
Li H.,Hubei University of Automotive Technology |
Li H.,Hubei Collaborative Innovation Center for Automotive Components Technology |
And 3 more authors.
International Journal of Hydrogen Energy | Year: 2017
Effects of palladium (Pd) impregnation on the performance of La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) cathodes are investigated with density functional theory plus U (DFT + U) and experimental methods. In-situ high temperature X-ray diffractometer results show that the impregnated Pd species exist at states of palladium oxide (PdO) at 700 °C. The measured electrochemical impedance spectroscopy at 700 °C indicates PdO modification promotes the catalytic activity of LSCF cathodes. The modification structure of PdO on LSCF surfaces and effects of PdO modification on the performance of LSCF cathodes are investigated with DFT + U methods. The results show that B-8 with PdO molecule modification by a parallel posture on LSCF surface is the most stable structure. O2 prefers to be adsorbed on AO-terminated surfaces rather than that on BO2-terminated ones. The oxygen surface adsorption activity of LSCF surface is improved by PdO modification. The calculated partial densities of states (PDOS) and Fermi level of O2 adsorption on LSCF surfaces imply that the charge transfer is easier with PdO modification than that without PdO modification because PdO acts as a metal-like modification. The PdO modification on LSCF surface leads to a better oxygen surface adsorption activity of LSCF cathodes. © 2017 Hydrogen Energy Publications LLC.
Liu J.,Hubei University of Automotive Technology |
Yu L.,Hubei University of Automotive Technology |
Li X.,Hubei University of Automotive Technology |
Liu S.,Hubei Collaborative Innovation Center for Automotive Components Technology
IET Communications | Year: 2017
Image segments are often used as a constraint in stereo matching. However, both over-segmentation and under-segmentation can lead to disparity degradation in some regions. To obtain an accurate disparity map, a modified semi-global matching (SGM) algorithm is proposed which is based on adaptive window models. Introducing the object notion and build a new global energy function to optimise segments and estimate a disparity map jointly. The effective and efficient block coordinate descent approach is used to optimise the global energy function by merging small segments. The authors' demonstrate the performance of the proposed algorithm on the KITTI and Middlebury benchmarks. The results show that the authors' algorithm outperforms many state-of-the-art methods and confirm the effectiveness of approach. © The Institution of Engineering and Technology.
Hu S.,Hubei University of Automotive Technology |
Hu S.,Hubei Collaborative Innovation Center for Automotive Components Technology |
Huang M.,Hubei University of Automotive Technology |
Huang M.,Hubei Collaborative Innovation Center for Automotive Components Technology
Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/Journal of Wuhan University of Technology (Transportation Science and Engineering) | Year: 2017
To improve energy utilization ratio of EVs, braking energy should be recycled. The model of braking intention identification and the thermal model of braking pad are established. The braking intention is identified by fuzzy control method and the severity of braking is used to describe the braking intention. To ensure the stability of braking, the distribution of braking force is based on ECE line, I curve and f curve. The temperature of braking pad is estimated by finite difference method and then the motor braking force compensation algorithm is put forward. The simulation results show that the cooperative control for friction and regenerative braking system considering heat fade can not only improve the energy regeneration ratio, but also make the braking process more stable. © 2017, Wuhan University of Technology. All right reserved.
Zhang P.,Wuhan University of Technology |
Zhang P.,Hubei Key Laboratory of Advanced Technology for Automotive Components |
Zhang P.,Hubei Collaborative Innovation Center for Automotive Components Technology |
Yan F.,Wuhan University of Technology |
And 5 more authors.
Renewable and Sustainable Energy Reviews | Year: 2015
Hybrid electric vehicles (HEVs) are one of the most viable technologies to achieve the goals of energy saving and environmental protection before a breakthrough in battery technology and fuel cell technology. Energy management strategy as a key technology of HEVs is studied extensively and deeply to improve the performance of HEVs and speed up the industrialization of HEVs. This paper quantitatively analyzes and evaluates current research status of energy management strategies for HEVs based on bibliometrics for the first time, through content analysis involving analysis of author keywords and abstracts. Then qualitative analysis is performed for all kinds of energy management strategies that are used in HEVs in detail, essential characteristics involving pros and cons, interconnections and improvement potential among various energy management strategies are revealed from the view of control theory. Finally, latest developing trends in energy management strategies of HEVs are presented to improve the performance of HEVs based on above quantitative analysis and qualitative analysis, covering driving cycle recognition/prediction algorithms, integrated multi-objective, coordinated optimization energy management strategies, good balance between computation complexity and optimization performance of energy management strategies, fair and credible evaluation system of energy management strategies. This paper not only first provides a comprehensive analysis of energy management strategies for HEVs, but also puts forward the emphasis and orientation of future study, which will broaden relevant researchers' vision and promote the development of a simple and practical energy management controller with low cost and high performance for HEVs. © 2015 Elsevier Ltd. All rights reserved.
Feng Z.-Y.,Hubei University of Automotive Technology |
Feng Z.-Y.,Hubei Collaborative Innovation Center for Automotive Components Technology |
Xu L.,Akita Prefectural University |
Liu Z.-T.,Wuhan University |
Li D.-Y.,Wuhan University
Chinese Control Conference, CCC | Year: 2015
Optimizing the coordinate transformation matrix is a newly proposed iterative LMI-based approach for solving the H∞ static-output-feedback (SOF) control of discrete-time systems. Once a proper initial coordinate transformation matrix was found, a locally optimal solution for the H∞ SOF control problem can be ensured. However, the problem of how to choose the initial matrix needs to be further studied. This paper applies a cone complementarity linearization (CCL) strategy to solve this problem. Then, a hybrid optimization approach is developed to solve the H∞ SOF control problem. Finally, numerical examples are provided to demonstrate the effectiveness and advantages of the proposed method. © 2015 Technical Committee on Control Theory, Chinese Association of Automation.
Du C.,Hubei Collaborative Innovation Center for Automotive Components Technology |
Ding X.,Hubei Collaborative Innovation Center for Automotive Components Technology
Proceedings of 2015 IEEE Advanced Information Technology, Electronic and Automation Control Conference, IAEAC 2015 | Year: 2015
In order to improve vehicle fuel economy, an energy management strategy is designed. The model of a plug-in hybrid electric vehicle (PHEV) with dual clutch is constructed by combining GT-drive and MATLAB/Simulink. Different driving cycles are chose to run the simulation to verify energy management strategy. The results show that the energy management strategy can meet the power demand, and economy has improved significantly compared with the car equipped with single power source-engine. © 2015 IEEE.
Liu Y.,Hubei University of Automotive Technology |
Liu Y.,Hubei Collaborative Innovation Center for Automotive Components Technology |
Bi J.,Hubei University of Automotive Technology |
Bi J.,Hubei Collaborative Innovation Center for Automotive Components Technology |
And 3 more authors.
International Journal of Hydrogen Energy | Year: 2016
The effects of palladium introduction on the catalytic activity of LSCF composite cathodes are investigated by comparing the performance of LSCF-GDC and Pd-LSCF-GDC cathodes. Pd-LSCF-GDC cathodes were prepared by impregnation of Pd and LSCF precursor into GDC scaffold separately in two steps. The electrochemical results show that the introduction of Pd promotes the catalytic activity of LSCF-GDC cathodes under the condition of both heating and cooling processes. The promotion is related to the existing state of Pd with LSCF under different conditions. According to in-situ high temperature XRD and XPS results, the PdO phase is stable at temperature below 700 °C, and decomposed to Pd metal at 700-800 °C during heating process. Combination XRD with TG-DSC analysis confirms that some Pd changes into PdO phase at 837 °C. Correspondingly, the phase composition changed little and the coexistence of Pd and tiny PdO is stable in the cooling process from 850 to 25 °C. Copyright © 2016 Hydrogen Energy Publications, LLC.
Ji M.,Hubei University of Automotive Technology |
Guo X.,Hubei Collaborative Innovation Center for Automotive Components Technology
Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/Journal of Wuhan University of Technology (Transportation Science and Engineering) | Year: 2015
Because of the existence of nonlinear friction in the screw-nut mechanism and planetary gear mechanism, a method had been proposed to describe the friction feature based on the LuGre dynamic friction model. Concerning the position change of the mechanism, asymmetrical surface roughness and the influence of environmental temperature variation, the parameters in friction model may change as well. To improve such phenomenon, it designed an adaptive friction compensation controller and used the Stability Theory of Lyapunov to prove the global stability of the system. Finally, the effectiveness of this method had been verified by the simulation of the electrical parking brake system. ©, 2015, Wuhan University of Technology. All right reserved.