Clean Energy Automotive Engineering Center

Shanghai, China

Clean Energy Automotive Engineering Center

Shanghai, China
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Liu J.,Clean Energy Automotive Engineering Center | Rodgers W.R.,General Motors
Polymer Composites | Year: 2015

The usefulness of supercritical CO2 (scCO2) in the processing of thermoplastic olefin (TPO) nanocomposites was investigated using a simple extensional flow mixing device. An organoclay (Cloisite® 20A), a maleated polypropylene (Polybond® 3200), and a TPO polymer were selected for this study. The three components were combined in different manners to evaluate how scCO2 influenced the microstructure of a final nanocomposite prepared by different mixing orders of the formulation components. The organoclay was examined in its as-supplied state as well as after being conditioned under scCO2. Analyses of the nanocomposites by X-ray diffraction, transmission electron microscopy, and parallel plate rheology techniques showed that inclusion of scCO2 during melt compounding significantly contributed to disrupting the crystalline order in the structure of the original organoclay. However, the order by which the formulation components are combined under scCO2 was important to clay dispersion. It was shown that making use of the proper combination order led to an improvement in the modulus of the resulting nanocomposites as measured by rheology. © 2015 Society of Plastics Engineers.

Yang P.,Tongji University | Yang P.,Clean Energy Automotive Engineering Center | Xiong L.,Tongji University | Xiong L.,Clean Energy Automotive Engineering Center | And 2 more authors.
Qiche Gongcheng/Automotive Engineering | Year: 2013

With improving vehicle stability as objective, an in-wheel motors/hydraulic brake system combined-control strategy is designed for four-wheel motor driven vehicles. The controller adopts layered control structure: the upper layer applies sliding mode variable structure theory to obtain the generalized force, while the lower layer uses quadratic programming method to optimize torque distribution, with consideration of the position and speed constraints of actuators. A CARSIM / MATLAB co-simulation is conducted for algorithm verification. The results show that under critical conditions, vehicles without control or controlled only with in-wheel motors can not complete the simulated operation, while the vehicle with in-wheel motor/hydraulic brake system combined-control strategy can assure the handling stability of vehicle.

Zhong Z.,Tongji University | Zhang L.,Tongji University | Wu H.,Tongji University | Yu Z.,Tongji University | And 3 more authors.
Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/Journal of Wuhan University of Technology (Transportation Science and Engineering) | Year: 2016

The working principle and structure of a novel fixed shaft type hybrid power transmission for hybrid vehicle is introduced, by which the motor power transfer path can be switched. On one hand, the motor can be used to provide power to the wheel side with high efficiency using the gear ratio. On the other hand, the power interrupt problem can be overcome in the process of AMT shift. Through twin countershaft transmission scheme, several gear ratios are realized based on limited space and the design space for the arrangement of the motor in tandem with transmission is achieved. The driving performance of a mini passenger prototype car is analyzed. The gear shift process without power interrupt is explained through detailed simulations. The results prove that EMT can effectively solve the power interrupt problem during gear shift process. © 2016, Editorial Department of Journal of Wuhan University of Technology. All right reserved.

Zhang W.,Tongji University | Zhang W.,Clean Energy Automotive Engineering Center | Xiong L.,Tongji University | Xiong L.,Clean Energy Automotive Engineering Center | And 6 more authors.
Qiche Gongcheng/Automotive Engineering | Year: 2013

Based on motion tracking control algorithm, the effects of two typical estimation errors, i.e. offset error and proportional error, of CM sideslip angle estimation on vehicle stability control is analyzed by simulation. The results show that for ensuring light driver's operation intensity and high stability of vehicle, the offset error of CM sideslip angle should not exceed 2 degrees and its proportional error should not exceed 20% of its real value. Providing there is no much effects on vehicle stability, reasonably underestimated CM sideslip angle can improve the maneuverability of vehicles.

Song Y.,Clean Energy Automotive Engineering Center | Song Y.,Tongji University | Lu H.,Clean Energy Automotive Engineering Center | Lu H.,Tongji University | And 4 more authors.
Gaodeng Xuexiao Huaxue Xuebao/Chemical Journal of Chinese Universities | Year: 2015

Modified Ti meshes used as anode collector layer of solid polymer electrolyte (SPE) electrolyzer were prepared through Adams fusion method. The Ti mesh modification synchronized with IrO2 preparation. The physico-chemical properties of the modified Ti meshes and IrO2 catalyst were studied by scanning electron microscopy (SEM), X-ray diffraction (XRD) and transmission electron microscopy (TEM). An IrO2 layer was formed onto the Ti mesh's surface and the size of anode catalyst IrO2 was in nanoscale. The SPE electrolyzer employing modified Ti mesh showed a higher performance due to the extension of three-phase activity sites from catalyst layer to diffusion layer. 100 mesh Ti mesh showed lower Rct and better catalyst loadings compared with 50 mesh one, and owned a good durability as well. Ti meshes with different catalyst loadings were tested and the Ti mesh with 1.38% (mass fraction) catalyst loading exhibited the best performance, which yielded a potential of 2.028 V at a current density of 1 A/cm2. ©, 2015, Higher Education Press. All right reserved.

Yang P.F.,Tongji University | Yang P.F.,Clean Energy Automotive Engineering Center | Xiong L.,Tongji University | Xiong L.,Clean Energy Automotive Engineering Center | And 2 more authors.
Applied Mechanics and Materials | Year: 2013

Design the stability control strategy of four in-wheel-motors drive electric vehicle (EV) based on control allocation. Two kinds of control allocation methods are designed in this paper, one is the quadratic programming (QP), and the other is a simplified optimization method (SOM). Comparing and evaluating the control strategies through the co-simulation with MATLAB software and CARSIM software. The results of the simulation show: both strategies could stabilize the vehicle posture well under critical condition. QP has more accuracy than SOM, and could rebuild the system automatically when the motor fails. But the SOM doesn't need iteration, could be possible to use in the real vehicle. © (2013) Trans Tech Publications, Switzerland.

Zheng X.,Tongji University | Zheng X.,Clean Energy Automotive Engineering Center | Yang D.,Tongji University | Tao K.,Clean Energy Automotive Engineering Center | And 4 more authors.
EVS 2010 - Sustainable Mobility Revolution: 25th World Battery, Hybrid and Fuel Cell Electric Vehicle Symposium and Exhibition | Year: 2010

Proper operating temperature range and homogenous temperature distribution are important to proton exchange membrane fuel cell (PEMFC). For the elevated temperature PEMFC water is not suitable to be used as coolant due to high operating temperature. Instead, air can be chosen as coolant because of the relative large temperature difference between fuel cell itself and the ambient air. In this paper, four types of forced air-cooling modes for elevated temperature PEMFC were compared, and influences of other factors such as cooling air inlet velocity and thermal conductivity of bipolar plate and fins on heat dissipation and temperature distribution were investigated. Threedimensional computational fluid dynamics (CFD) method was employed to investigate fluid flow and heat transfer in the elevated temperature PEMFC on a 250 cm2 single cell level. The temperature fields on the active area of MEA were obtained and compared. One optimized mode, with suitable cooling air inlet velocity and bipolar plate material, was determined for future experimental study.

Niu J.,Clean Energy Automotive Engineering Center | Pei F.,Clean Energy Automotive Engineering Center | Zhou S.,Clean Energy Automotive Engineering Center | Zhou S.,Tongji University | And 2 more authors.
Advanced Materials Research | Year: 2013

A new method based on genetic-particle swarm hybrid algorithm was presented for parameter optimization of energy management strategy for extended-range electric vehicle (E-REV). Taking a logic threshold control strategy of an E-REV as example, for the aims of minimizing fuel consumption and emissions, a constrained nonlinear programming parameter optimization model was established. Based on this model, genetic algorithm (GA) and particle swarm optimization (PSO) were improved respectively. Further, a genetic-particle swarm hybrid algorithm was put forward and applied to the multi-objective optimization of E-REV energy management strategy. Optimization results show that the hybrid optimization algorithm can avoid falling into local optimum and its search ability is much better than improved adaptive genetic algorithm (IAGA). This hybrid algorithm is also suitable for the control parameters optimization issues of other types of hybrid electric vehicles. © (2013) Trans Tech Publications, Switzerland.

Zou W.,East China University of Science and Technology | Zou W.,Clean Energy Automotive Engineering Center | Pan X.,Clean Energy Automotive Engineering Center | Pan X.,Tongji University | And 4 more authors.
Taiyangneng Xuebao/Acta Energiae Solaris Sinica | Year: 2011

Cu-Ni/γ-Al2O3 catalysts were prepared by deposition-precipitation method. Hydrogen production from dimethyl ether steam reforming was investigated in a fixed-bed continuous-flow stainless steel reactor. Process conditions of reduction temperature, reaction temperature, system pressure, space speed, and particle diameter were investigated on hydrogen production from dimethyl ether steam reforming over Cu-Ni/γ-Al2O3 catalysts. The results showed that the suitable process conditions are reduction temperature of 400°C, particle diameter of 0.45-0.90 mm, reaction temperature of 350°C, under atmospheric pressure, and a space speed of 3240mL·(gcat·h)-1.

Xiong L.,Clean Energy Automotive Engineering Center | Xiong L.,Tongji University | Hou Y.,Tongji University | Guang X.,Tongji University | Xu S.,Tongji University
IEEE Transportation Electrification Conference and Expo, ITEC Asia-Pacific 2014 - Conference Proceedings | Year: 2014

This paper is mainly devoted to an Electronic Hydraulic Brake system (EHB) which is driven by two motors. The main objective of this system is to control the brake pedal feel and the hydraulic pressure of the system actively, realizing the maximum braking energy recovery and utilizing the pressure produced by manpower sufficiently. This study can also be used to self-driving cars. Based on the designed dual-motor driving EHB system, a control strategy is introduced and the feasibility of it is verified by using the software AMEsim. The simulation results show that this control strategy can achieve functions well. © 2014 IEEE.

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