Hou C.,Tsinghua University |
Hou C.,Chongqing Changan Automobile Company Ltd |
Wang H.,Tsinghua University |
Ouyang M.,Tsinghua University
Energies | Year: 2014
This paper proposes a total cost of ownership (TCO) model for battery sizing of plug-in hybrid electric vehicles (PHEVs). The proposed systematic TCO model innovatively integrates the Beijing driving database and optimal PHEV energy management strategies developed earlier. The TCO, including battery, fuel, electricity, and salvage costs, is calculated in yearly cash flows. The salvage cost, based on battery degradation model, is proposed for the first time. The results show that the optimal battery size for PHEVs in Beijing is 6-8 kWh. Several additional scenarios are also analyzed: (1) 10% increase in battery price or discount rate leads to an optimal battery size of 6 kWh, and 10% increase in fuel price shifts the optimal battery size to 8 kWh; (2) the longer and more dispersive daily range distribution in the U.S. increases the optimal battery size to 14 kWh; (3) the subsidy in China results in an optimal battery size of 13 kWh, while that in the U.S. results in 17 kWh, and a fuel savings rate based subsidy policy is innovatively proposed; (4) the optimal battery size with Li4Ti5O12 batteries is 2 kWh, but the TCO of Li4Ti5O12 batteries is higher than that of LiFePO4 batteries. © 2014 by the authors.
News Article | April 20, 2016
Chinese automaker and Ford's partner Chongqing Changan Automobile Co. announced the successful road trip of its self-driving car. The vehicle traveled from Chongqing in Southwest China to Beijing, which is in the northeast. The journey covered more than 1,200 miles (almost 2,000 kilometers) and lasted for six days - that's an average of 200 miles (321.8 kilometers) a day. At least two of the company's self-driving cars accomplished the journey where they took routes in a live environment. In a statement given to the Shenzhen stock exchange, the Chinese automaker said that its self-driving cars have used cameras and radar that allowed the pair to test a number of varying functions. According to the company, the driverless cars were able to assess automatic cruising, assisted driving when there's traffic congestion, lane keeping or changing and speed reduction by way of voice control and traffic sign recognition. Li Yusheng, the project's chief engineer, said that one car had even reached up to 75 mph on the nation's open highway and managed to adapt to the changing road surface. "The cars ran up to 120 km per hour on the highway, and adapted to the changing road surface," said Li. Kong Zhouwei, a car tester, said that when the self-driving cars passed through small tunnels that have dim or zero lighting, their response time was slower. Kong attributed the cars' slow response rate to the difficulty in recognizing the road markings when the cars used their in-vehicle cameras after the external lights changed. Kong said that the company plans to employ laser radar techniques in order to address this difficulty that the two cars encountered. Other challenges that were seen during the road test included trucks that seemed wider than the lane and a couple of road sections and gas stations that required the cars to be under assisted driving. Chongqing joins other Chinese companies such as Baidu, BYD, SAIC Motor, GAC Group and BAIC group in a global race to create self-driving cars with occasional or zero human intervention. The automaker plans to produce self-driving cars designed exclusively for traveling on highways and make them commercially available by 2018. It also plans to mass produce self-driving cars capable enough to navigate the nation's complicated urban roads by 2025. Around the globe, there are at least 18 companies that are developing autonomous cars. These include Toyota, Audi and BMW to name a few. © 2016 Tech Times, All rights reserved. Do not reproduce without permission.
Zhang Y.,Chongqing Industry Polytechnic College |
Hong J.,Chongqing Changan Automobile Company Ltd
Advanced Materials Research | Year: 2013
This article puts forward One-step forming simulation method to solve blank outline problems in the process of sheet metal forming. The blank outline curve is got from the simulated analysis of Groupware of Fender by one-step simulation in Dynaform 3D software for sheet forming, considering the final shape of the workpiece. It simulates three programs via three different shapes of blanks. And it compares and analyze the FLD diagram and forming results, and then it gets the optimized blank shape. This way guides the mould design, and save the time of repairing moulds on the basis of producing qualified products. It overcomes the puzzle how to choose the blanks' size and shape. © (2013) Trans Tech Publications, Switzerland.
Hu J.-J.,Chongqing University |
Li K.-L.,Chongqing University |
Hu M.-H.,Chongqing University |
Du C.-S.,Chongqing Changan Automobile Company Ltd
Zhongguo Gonglu Xuebao/China Journal of Highway and Transport | Year: 2012
In order to realize a quick, smooth and precise gear shifting of AMT used on pure electric car, the mathematic model of gear shifting process was established. Based on it, the formation mechanism of gear shifting impact at different stages of the gear shifting was analyzed. The torque control method of driving motor before shifting was proposed, the target speed of driving motor and the optimal moving velocity of shift actuator after shifting were determined, and the torque resuming method after shifting was proposed. Aimed at the problem of coordination control of driving motor in the gear shifting process, a coordination matching control method where car controller controlled driving motor in the gear shifting was proposed. In order to verify the validity of the control strategy, an AMT prototype for pure electric car was developed, and the road tests of prototype were carried out. Test results show that the control strategy can well achieve automatic smooth gear shifting and the short gear shifting time.
Yi Z.-J.,Chongqing University |
Jiang J.,Chongqing University |
Hu Y.,Chongqing Changan Automobile Co.
Zidonghua Xuebao/Acta Automatica Sinica | Year: 2011
The stockpiling state of containers is usually not in the ideal order of the containers to be sent, so relocation of the containers is inevitable. In order to reduce the relocation frequency in the container yards, improve operational efficiency, on the condition that the order of container withdrawal is required, the paper regards every possible state that may be generated when a container is being withdrawn as a node, and takes the number of relocations plus a base as the connection weight of the node. Then, the optimization problem for container relocation is converted into the shortest-path solution problem. The paper brings forward a new approach to find the shortest path based on pulse-coupled neural network, which can be used to solve large-scale practical problem. We can easily work out the shortest path from a source to all other target points, therefore we have the best relocation program. The algorithm lays a solid theoretical basis for the container intelligent control system. Copyright © 2011 Acta Automatica Sinica.
Zheng Z.,Chongqing University |
Tian X.,Chongqing University |
Zhang X.,Chongqing Changan Automobile Co.
Applied Thermal Engineering | Year: 2015
Abstract The effects of split injection proportion and start of injection for the second injection event (SOI2) are investigated with multi-dimensional computational fluid dynamics in a gasoline direct-injection (GDI) engine under catalyst heating mode using stratified stoichiometric charge strategy. Results show that when the injection timing is fixed, the equivalence ratio in the spark plug at ignition time decreases with the decrease in the second injection proportion. The homogeneity of the overall mixtures increases at the same time. The 25%-75% case can form an ideal ignitable mixture and exhibits good combustion performance, which results in rapid catalyst light-off and low soot emissions. NO emissions are relatively high but can be addressed by a three-way catalyst. When the split injection proportion is fixed, the cases with SOI2 of 610°CA, 620°CA, 630°CA, and 660°CA can form an ideal mixture at ignition time. The cases with SOI2 of 610°CA and 620°CA produce a more homogeneous mixture and thus exhibit better combustion performance; however, the detonation tendency is obvious. The mixture of the case with SOI2 of 630°CA is more homogeneous than that of the case with SOI2 of 660°CA. The former exhibits better combustion performance and has a lower amount of soot emission. Although the NO emissions of 630°CA SOI2 are slightly high, it contributes to rapid catalyst light-off. Therefore, 630°CA is the ideal SOI2 in the present conditions. © 2015 Elsevier Ltd. All rights reserved.
Jing X.,Chongqing Changan Automobile Company
Proceedings of 2011 International Conference on Electronic and Mechanical Engineering and Information Technology, EMEIT 2011 | Year: 2011
Certificateless signcryption (CLSC) is one of the most significant security primitives in CL-PKC, and at the same time achieves confidentiality and authentication by combining public-key encryption and digital signatures, offering better overall performance and security. There are two pairing-free CLSC schemes, which aim at reducing the computing costs by removing pairing. Moreover, these schemes adopt much modular exponential operations, which degrade its computation performance. This paper proposes a new CLSC scheme without pairing, and analyzes its security using random oracles under the computational Diffie-Hellman assumption. It shows that the new scheme is more efficient than all previous constructions. © 2011 IEEE.
Chongqing Changan Automobile Co. | Date: 2011-03-23
A nickel-hydrogen battery pack heat removal system for hybrid vehicle is provided. The system includes a battery box, a power battery pack (8), a battery support frame (9), a support bar (5), an air inlet (1), an air outlet (6) and a fan (7). Batteries in the power battery pack (8) are aligned in parallel in two layers one above the other in the battery support frame (9) of the battery box, and the support bar (5) and the battery support frame (9) are fixed on the upper and lower soleplates respectively of the battery box. The air inlet (1) is set at one end of the battery box, the air outlet (6) is set at the other end of the battery box, and the fan (7) is fitted at the air outlet (6). The system further includes conduction plates (2) in the shape of circular arcs, said conduction plates (2) being fitted on the opposing faces of the two upper and lower batteries which are closest to the air inlet (1).
Chongqing Changan Automobile Co. | Date: 2010-11-03
A vehicle central lock antitheft method and system includes a central lock system which is connected by radio with a remote controller for identity verification using rolling codes (S101, S102), wherein the central lock system chooses a security state (S103) and transmits the security state to an engine management system according to the verification result, the ignition IG status and the door switch status signal indicating opening or closing of the door (S104). The engine management system receives the security state transmitted by the central lock system and verifies the identity of the central lock system by code matching (S 106); security identification between the engine management system and the central lock system is carried out by bidirectional encryption communication (S107). The engine management system then decides whether or not to lock the engine according to the result of the security identification.
Chongqing Changan Automobile Co. | Date: 2011-10-31
Buses; vans; cars; automobile chassis; vehicle windscreens; motors and engines for land vehicles; shock absorbers for automobiles; vehicle wheels; vehicle parts, namely, steering wheels.