Time filter

Source Type

Yu H.-S.,Shanghai JiaoTong University | Yu H.-S.,Shanghai Maple Automobile Co. | Zhang J.-W.,Shanghai Maple Automobile Co. | Zhang T.,Shanghai Maple Automobile Co.
Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering | Year: 2012

A new electromechanical power-splitting full-hybrid transmission with two shifting elements, namely a four-shaft planetary gear and an electronic continuously variable transmission, is introduced in this paper. This transmission was developed with the aim of combining all the advantages of an internal combustion engine and two electric motors in an optimal way so as to improve the power performance and the fuel economy. The architecture and analogy of the four-shaft planetary gear are analysed, a control strategy is designed, and the engine management system and hybrid control system are calibrated. To evaluate the performance, the control strategy and the calibrated results, nine tests were performed as per the New European Driving Cycle under various initial conditions, different maps and different thresholds. The test results indicate that a four-shaft planetary gear, electronic continuously variable transmission hybrid electric vehicle can realize good fuel economy and good emissions performance except for nitrogen oxide emissions. The best fuel consumption obtained was 5.4 l/100 km. The amount of nitrogen oxide emissions needs to be decreased by optimizing the control strategy of the hybrid control system and calibration of the engine management system in future research. © 2012 IMechE.

Wang C.-L.,Shanghai JiaoTong University | Yin C.-L.,Shanghai JiaoTong University | Luo G.,Shanghai Maple Automobile Company Ltd | Wang L.,Shanghai JiaoTong University
Neiranji Xuebao/Transactions of CSICE (Chinese Society for Internal Combustion Engines) | Year: 2012

The idle-stopping function of hybrid electric vehicle(HEV) not only increases the starts, but also postpones three-way catalyst(TWC) activation, bringing unfavorable influence on engine emission. So start process of hybrid is worth of studying. To satisfy the drivability and acceleration performance, extra fuel is required for engine at conventional vehicle acceleration. Transient fuel will deteriorate emissions dramatically, and it is hard to control the transient emissions. Hybrid start and acceleration strategies were developed based on the ISG characteristic. The air-fuel ratio(AFR) at cold start and hot start is under control. The concept of ISG "fast" and "slow" torque to overcome the conventional engine transient fuel is proposed. Reasonable ECU and VCU parameters are determined. Tests at NEDC driving cycle were conducted both on conventional and hybrid modes. Result shows that the conventional start fuel reduces with aid of ISG motoring. The transient fuel at acceleration is replaced by the ISG torque. The HEV can simultaneously realize reduction in fuel consumption and emissions.

Tang X.,Shanghai JiaoTong University | Zhang J.,Shanghai JiaoTong University | Yu H.,Shanghai JiaoTong University | Yu H.,Shanghai Maple Automobile Co. | Liang Z.,Shanghai JiaoTong University
International Journal of Electric and Hybrid Vehicles | Year: 2013

A torsional vibration dynamic model is built to predict the torsional vibration characteristics of a power-split hybrid system. On the basis of this dynamic model, the system dynamic equations of hybrid driveline are set, from which the natural frequencies and relevant mode shapes under different driving modes are solved using the corresponding eigenvalue problem. The calculated results show that the low frequencies occur mainly in the torsional vibration of wheels and vehicle, the intermediate frequencies are relevant to the torsional vibration of the sun gears, the differential and the reducer, in general, and the high frequencies are related to the torsional vibration of planets. Copyright © 2013 Inderscience Enterprises Ltd.

Zhang J.,Shanghai JiaoTong University | Liu D.,Shanghai JiaoTong University | Yu H.,Shanghai Maple Automobile Co.
SAE Technical Papers | Year: 2015

A novel single-mode compound split hybrid transmission with a compound planetary gear set and two brakes has been studied, which has more freedom of control to increase the system efficiency. System dynamics and matching performance of the driveline including a compound planetary gear set for a single-mode hybrid electric vehicle are numerically investigated. The multi-degrees of freedom torsional vibration model for the full-hybrid vehicle driveline with the power split device is established by MATLAB/Simulink. For comparison of the natural characteristic, eigenfrequencies and mode shapes are determined with the aid of a further simplified single-track mechanical model under different operation modes. Then, numerical simulations of dynamics and kinematics of the driveline and the compound planetary gear set are carried out. In the end, for alleviation of the severe vibrations of the driveline, effects of the torsional damper and the flywheel on the whole system vibrations are examined. Copyright © 2015 SAE International.

Shanghai Maple Automobile Co. and Zhejiang Geely Holding Group | Date: 2012-07-04

A hydraulic control device for a hybrid transmission, comprising an oil pump and a main oil line connected therewith, said mail oil line is connected to a cooling and lubrication oil line, a clutch control oil line and a solenoid control oil line respectively, the main oil line is connected to the cooling and lubrication oil line through an oil orifice on an unloading valve, the cooling and lubrication oil line at the same time is connected to a valve spool control oil port of the unloading valve, while the oil outlet of the unloading valve is connected to an oil inlet of an overflow valve and the clutch control oil line respectively, the oil outlet of the overflow valve is connected to the cooling and lubrication oil line, a cooler is provided on the cooling and lubrication oil line, the clutch control oil line is connected to the oil inlets of first and second proportional pressure reducing valves respectively, a pressure reducing valve is provided between the solenoid control oil line and the main oil line, the solenoid control oil line is connected respectively to the valve spool control oil ports of the first and second proportional pressure reducing valves through an oil orifice, and the solenoid control oil line is also connected to a switch solenoid and a parking lock hydraulic oil cylinder through the oil orifice respectively.

Shanghai Maple Automobile Co. and Zhejiang Geely Holding Group | Date: 2012-07-04

The invention relates to a powertrain for a hybrid electrical vehicle, comprising an engine, a first motor, a second motor and a transmission device, said transmission device having a planet gear set with double planet gear ranks comprising a first planet gear rank and a second planet gear rank, said engine is arranged on one side of said planet gear set, said first motor and said second motor are arranged on the other side of the planet gear set, said first planet gear rank comprises a small sun gear, a planet carrier, a short planet gear and an outer ring gear, said second planet gear rank comprises a big sun gear, a long planet gear and the planet carrier shared with the first planet gear rank, said long planet gear meshes with the short planet gear and the big sun gear respectively. The powertrain according to the invention is of a compact structure, low requirements on the power sources, and can realize multiple control modes.

Zhou J.-H.,Jiangsu University | Yuan Y.-N.,Nantong University | Liu X.-Q.,Jiangsu University | Chen D.-H.,Jiangsu University | Wang C.-L.,Shanghai Maple Automobile Co.
Neiranji Gongcheng/Chinese Internal Combustion Engine Engineering | Year: 2011

The comparative analysis of prototype engine between conventional starting motor start and high-speed cranking start with ISG (integrate starter/generator) was carried out to examine the variation regulation of engine transient speed, cylinder pressure, fuel compensation factor, intake air pressure, ignition timing, HC conversion efficiency, exhaust temperature and transient HC emission. The results show that, with cranking speed increasing, the intake pressure drops, causing the intake air quantity reduces, and fuel-film evaporation time shortens, the mixture atomization gets insufficient. The misfire occurs and the transient HC emission peak arises. All these phenomena have close relationship with ECT (engine coolant temperature). Fuel compensation in the first few working cycles of starting process can correct original lean mixture so as to decrease HC emission. Retarding ignition can raise the exhaust gas temperature. The conversion efficiency of three-way catalytic converter (TWC) in cold and warmed-up conditions is quite different. When engine is warmed up and the ignition timing is -10 °CA, the TWC lights off within 40 s and its HC conversion efficiency reaches about 90 % within 60 s.

Shi P.,Shanghai University of Electric Power | Shi P.,Donghua University | Dai X.,Shanghai Maple Automobile Co. | Zheng H.,Shanghai University of Electric Power | And 4 more authors.
Chemical Engineering Journal | Year: 2014

In this study, the synergistic catalytic mechanism of Co3O4 and graphene oxide (GO) nanocomposite in the heterogeneous activation of peroxymonosulfate (PMS) to generate sulfate radicals was studied. The activation of Co3O4/GO with different Co3O4 loadings in the catalyst [bare graphene oxide (GO), 20% Co3O4/GO, 30% Co3O4/GO, 50% Co3O4/GO, 70% Co3O4/GO, 90% Co3O4/GO, 95% Co3O4/GO, and pure Co3O4] were tested though the degradation of Orange II in water. The results show that the highest performance achieved using the Co3O4/GO catalyst was based on a synergistic catalysis between Co3O4 and GO. Furthermore, a proportional relation exists between Co3O4 and the catalyst. The highest catalytic activity is observed when the Co3O4 loading was about 50% in the catalyst. Co-OH complexes form on the surface of the GO sheet through the direct interaction of Co species with nearby hydroxyl groups or through the dissociation of H2O with Co2+. The formation is proposed to facilitate the heterogeneous activation of PMS. However, a high Co3O4 loading on the GO surface prevents the formation of Co-OH complexes, which is important in the catalytic reaction. © 2013 Elsevier B.V.

Wang D.P.,Nanjing University of Aeronautics and Astronautics | Wang D.P.,Shanghai Maple Automobile Co. | Li S.M.,Nanjing University of Aeronautics and Astronautics
Applied Mechanics and Materials | Year: 2012

As the most energy-saving hybrid system in the world, the full hybrid system has high research value. On the basis of the mechanical structural analysis of one new full hybrid system, studied its control strategy and analyzed the control algorithm for its power balance in the five working modes by means of simulated equivalent lever. It is hoped that this could provide technical support for the development of domestic full hybrid cars.

Gai F.,Jiangsu University | Gai F.,Shanghai Maple Automobile Co. | Du J.,Jiangsu University | Zhong T.,Jiangsu University | Zhong T.,Shanghai Maple Automobile Co.
Qiche Gongcheng/Automotive Engineering | Year: 2011

According to different braking control strategies, the regenerative braking systems of hybrid electric vehicle (HEV) are classified into three categories: series braking with the best braking effect, series braking with the maximum energy regeneration rate and parallel braking, which are then analyzed respectively. A control strategy is put forward based on SOC, vehicle speed and the position of braking pedal, and is applied to a typical parallel HEV. The test results show that the braking control strategy proposed can recovery more braking energy with better braking feeling on the premise of safety assurance.

Loading Shanghai Maple Automobile Co. collaborators
Loading Shanghai Maple Automobile Co. collaborators