National Key Laboratory of Vehicular Transmission

Laboratory of, China

National Key Laboratory of Vehicular Transmission

Laboratory of, China
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Wang T.,Beijing Institute of Technology | Liu H.,Beijing Institute of Technology | Liu H.,National Key Laboratory of Vehicular Transmission | Han L.,Beijing Institute of Technology | Han L.,National Key Laboratory of Vehicular Transmission
Energy Procedia | Year: 2017

Energy and environment has been the problem which is the most concerned by all over the world. Hybrid electric vehicle (HEV), which has the virtue of low exhaustion and low consumption, is the optimal choice to solve these problems at present. As an innovative power-split transmission (PST) technology, electro-mechanical transmission (EMT) is widely applied in military and civilian vehicles. In this paper, the dynamic matching problem of a dual-mode EMT is studied and a dynamic matching model is developed. A multi-objective optimization model is built to improve the motor energy utilization ratio through optimizing the design parameters. Sensitivity of the design parameters for dynamic matching performance are analyzed by design of experiments (DOE). Finally, the feasible region of the optimal parameters where the dynamic matching model get the optimal evaluation index is obtained. © 2017 The Authors.


Ma P.,Beijing Institute of Technology | Han L.,Beijing Institute of Technology | Han L.,National Key Laboratory of Vehicular Transmission | Liu H.,Beijing Institute of Technology | And 2 more authors.
Energy Procedia | Year: 2017

The optimal control of the vehicles with electro-mechanical transmission is a problem of multi-objective optimization. In this paper, based on the working characteristics of the engine, the battery pack and the motor/generators (MGs) as well as their interactions, a multi-objective optimization model with the optimal objective functions which include drivability, electric supply performance and fuel consumption is established. Using the relative membership degree formulas, the multi-objective optimization is transformed to fuzzy multi-objective optimization, and the problem of multi-objective optimization is converted to single-objective optimization with the corresponding weights of the objective functions gained by the minimum average weighted deviation algorithm. The forward model based on Matlab is implemented. Compared with the rule-based method, this method had enabled the drivability, the electric supply performance and the fuel consumption to improve by 29.8%, 38.1% and 11.8%, respectively. © 2017 Published by Elsevier Ltd.


Zhang X.,Beijing Institute of Technology | Liu H.,Beijing Institute of Technology | Liu H.,National Key Laboratory of Vehicular Transmission | Yinqi C.,Beijing Institute of Technology
Energy Procedia | Year: 2017

In this paper, a Linear-Quadratic-Gaussian (LQG) controller with estimator has been implemented for the suppression of torsional vibration on the powertrain of a power-split vehicle caused by an abrupt acceleration. Two motor/generators in the transmission are applied to improve the drive comfort and guarantee the dynamic response. An equivalent model of planetary gear has been put forward to simplify the transmission. The simulation results show that the LQG controller suppresses the vibration effectively. © 2017 The Authors.


Tang T.,Beijing Institute of Technology | Liu H.,National Key Laboratory of Vehicular Transmission | Han L.J.,Beijing Institute of Technology
Advanced Materials Research | Year: 2014

In this paper, a mode control strategy for a two-mode EVT hybrid electric vehicle (HEV) is proposed,considering transmission efficiency and mode change quality. First,speed and torque characteristics are analyzed by establishing relevant equations of two transmission mode. Next,the optimal operation mode is selected from the viewpoint of the transmission efficiency,when it is higher at a given speed ratio.Then,two scheme of operation sequence of clutch/brake are compared,and a control algorithm of synchronous control of two MGs and engine is suggested to reduce speed difference between both end of the clutch and torque fluctuation. A vehicle simulation based on Matlab/Simulink was performed to testify the mode change control algorithm of the dual-mode EVT HEV,and the simulation results showed that the mode control strategy for the dual-mode EVT HEV gave acceptable performance. © (2014) Trans Tech Publications, Switzerland.


Zhang D.,Beijing Institute of Technology | Xiang C.,Beijing Institute of Technology | Xiang C.,National Key Laboratory of Vehicular Transmission | Han L.,Beijing Institute of Technology | And 2 more authors.
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2015

To solve the optimal control problem of HEVs during the dynamic process, a dynamic control strategy was proposed based on drivability optimization. A control-oriented dynamic power distribution model was established according to the characteristics of the power-split hybrid electric system. Based on the driver's expected status and the vehicle's actual status, the index function of the drivability was come up with. A control strategy satisfying the drivability was presented firstly. The dynamic characteristics of the different components and the speed tracing requirements of the engine were fully considered in the optimization model. Additionally, a real-time optimization algorithm of the drivability was proposed. It can be seen from the simulation results that this control method improves the drivability dramatically without scarifying the fuel economy. ©, 2015, China Mechanical Engineering Magazine Office. All right reserved.


Zhang D.,Beijing Institute of Technology | Xiang C.,National Key Laboratory of Vehicular Transmission | Han L.,Beijing Institute of Technology
Lecture Notes in Electrical Engineering | Year: 2013

The tri-mode power-split transmissions, compared with the single-mode and dual-mode ones, can further optimize the operating point of the engine, make full use of the characteristics of the motor/generator and improve the driving performance and the fuel economy of the vehicles. As the structure of tri-mode systems is more complex, it is difficult to apply the design method of single-mode or dual-mode systems in the tri-mode ones. Therefore, it is quite necessary to further study the method of design and performance prediction of tri-mode power-split transmissions. The design method of power-split transmissions based on ideal driving performance and the operating characteristics of the components was put forward, and a tri-mode power-split transmission was designed. The optimal parameter matching method was developed by taking the driving performance, fuel economy and cost as optimization objective, the feasible schemes as research object and the system parameters and control parameters as optimized variables. Then, based on MATLAB and Simulink, a performance prediction method was provided and the steady-state performance and dynamic performance of the power-split transmission was predicted. © Springer-Verlag 2013.


Zheng H.,Beijing Institute of Technology | Xiang C.,Beijing Institute of Technology | Xiang C.,National Key Laboratory of Vehicular Transmission | Wang W.,Beijing Institute of Technology | And 4 more authors.
Qiche Gongcheng/Automotive Engineering | Year: 2015

When the electro-mechanical transmission (EMT) system switches to hybrid drive mode from pure electric mode, it is required to crank and start the engine. Due to the response lag of engine, the motor usually provides additional driving torque to ensure the power performance of vehicle. However, the excessive motor torque can cause too large a battery discharge current, in particular, when battery temperature is relatively low, may affecting the service life of battery. In this paper, an engine start control strategy for EMT system is proposed based on predictive information. Firstly by sampling the present and past information on system torque requirement and applying adaptive recursive multi-step predictive algorithm, the online prediction on the required torque of system is completed. Then the predicted information on the torque requirement of system is used to control engine starting process with the phenomenon of battery overload avoided. Hence on the premise of ensuring vehicle power performance, battery life can be effectively extended. ©, 2015, SAE-China. All right reserved.


Peng Z.-X.,Beijing Institute of Technology | Hu J.-B.,National Key Laboratory of Vehicular Transmission | Xie T.-L.,Beijing Institute of Technology | Liu C.-W.,Beijing Institute of Technology
Journal of Mechanical Design, Transactions of the ASME | Year: 2015

To obtain multiple speed ratios, a synthesis methodology of planetary gear trains (PGTs) with multiple operating degrees-of-freedom (DOFs) is proposed based on the variable structure method. Variable structure of PGT is accomplished by changing the fixed interconnection edge. First, PGTs with two operating DOFs are synthesized with a deduction method based on the relationship between the number of planetary gear sets (PGSs) and number of fixed interconnection edges. Next, connection characteristics of fixed interconnection edges are defined as frequency of utilization to construct original speed ratios of the two operating DOFs schemes. The connection characteristics are then obtained based on the power flow analysis. PGT graph model with connection characteristic is built to provide guidance in the design of varying structure. Finally, multi-speed PGTs with multiple operating DOFs are synthesized based on the graph model and lever analogy. A design example for three-PGS PGTs is considered to highlight capabilities of the variable structure method. Copyright © 2015 by ASME.


Zhang D.,Beijing Institute of Technology | Xiang C.,Beijing Institute of Technology | Xiang C.,National Key Laboratory of Vehicular Transmission | Han L.,Beijing Institute of Technology | And 2 more authors.
IEEE Transportation Electrification Conference and Expo, ITEC Asia-Pacific 2014 - Conference Proceedings | Year: 2014

Electro-Mechanical Transmission (EMT), which is especially suitable for the heavy-duty vehicles, can transmit the engine's energy to the drive shaft by electrical and mechanical power paths so that it can improve the driving and fuel economic performance. The problem is how to split the power flow to achieve the best performance. The non-linear multi-objective optimization model was built and a hierarchic optimization algorithm was proposed. The feasibility and effectiveness of the algorithm was verified by the simulation results, which can also provide the basis for further development of the control strategy. © 2014 IEEE.


Wang W.,National Key Laboratory of Vehicular Transmission | Xiang C.,National Key Laboratory of Vehicular Transmission | Liu H.,National Key Laboratory of Vehicular Transmission | Han L.,National Key Laboratory of Vehicular Transmission
Harbin Gongye Daxue Xuebao/Journal of Harbin Institute of Technology | Year: 2013

Aiming at the smoothness and responding speed of total brake force of electric and mechanical brake system, the closed loop control strategy of brake force based on the feedforward-feedback structure is proposed to meet the demand of driver request brake force and recover the brake energy efficiently. The strategy can harmonize the static distribution and dynamic control of electric and mechanical brake force, and recuperate the dynamic responding speed of mechanical brake force by the rapid responding speed of motor brake force. The feedforward part of strategy calculates the desired characteristic of the brake force, and the feedback part of strategy adjusts the dynamic characteristic of the total and mechanical brake forces by the closed loop algorithm for enhancing the smoothness and responding speed of total brake force. The simulation results indicate that the desired control characteristic of closed loop strategy is validated and the complex control problem of electric and mechanical brake with multi control objective and multi closed loop can be solved well by the feedforward-feedback control structure.

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