Modeling and Simulation of a Vehicle Equipped with Power Split Automatic Transmission

2011 ◽  
Vol 383-390 ◽  
pp. 4708-4712
Author(s):  
Qing Yong Zhang
Keyword(s):  
Modeling And Simulation ◽  
Fuel Economy ◽  
Control Strategy ◽  
High Efficiency ◽  
Automatic Transmission ◽  
Simulation Software ◽  
Driving Cycle ◽  
Mechanical Transmission ◽  
Power Split ◽  
Vehicle Simulator

his paper is concerned with the fuel economy of a mini car with power split automatic transmission (PSAT) by means of simulation. Firstly, a PSAT prototype is developed featured with high efficiency by power split. Secondly, mathematic models of PSAT, based on the PSAT scheme and experiment on the prototype, is established and embedded into the simulation software NREL’s Advanced Vehicle Simulator (ADVISOR) to carry out the whole vehicle fuel economy simulation. Thirdly, fuel economy comparison between vehicle with PSAT and traditional mechanical transmission is present, after fuel economy simulation under different driving cycle. Finally, approach to the energy save scheme of PSAT and matching between PSAT and the whole vehicle is discussed which builds up a good foundation for future optimization on control strategy of PSAT.

Modeling and Simulation of Electric-Hydraulic Clutch on Light Vehicle

2011 ◽  
Vol 383-390 ◽  
pp. 2377-2382
Author(s):  
Jin Yu Qu ◽  
Dong Wang ◽  
Yi Rui Zhang ◽  
Gui Xin Qu
Keyword(s):  
Modeling And Simulation ◽  
Control Strategy ◽  
Simple Structure ◽  
High Efficiency ◽  
Low Cost ◽  
Mechanical Transmission ◽  
Variable Control ◽  
Engagement Process ◽  
Light Vehicle

With high efficiency, simple structure and low cost, Automatic Mechanical Transmission (AMT) is suitable for the development and application of light vehicles. The control of clutch is emphasized on in the shifting process. It is necessary to study the control of engagement speed. In this paper, the electric-hydraulic clutch applied on light vehicles is modeled and the engagement process of clutch during vehicle starting simulated. After analyzing the operation quality of clutch with different engagement speeds, the speed variable control strategy is proposed. According to the strategy, engagement speed changes with the development of different operating stages. At last, the simulation is carried out to verify the feasibility and superiority of this kind of strategy.

scholarly journals Components Sizing and Performance Analysis of Hydro-Mechanical Power Split Transmission Applied to a Wheel Loader

Energies ◽  
2019 ◽  
Vol 12 (9) ◽  
pp. 1613 ◽  
Author(s):  
Shaoping Xiong ◽  
Gabriel Wilfong ◽  
John Lumkes
Keyword(s):  
Control System ◽  
Fuel Economy ◽  
Mechanical Power ◽  
Mechanical Transmission ◽  
Road Vehicles ◽  
Drive Cycle ◽  
Wheel Loader ◽  
Vehicle Velocity ◽  
Power Split ◽  
Wheel Loaders

The powertrain efficiency deeply affects the performance of off-road vehicles like wheel loaders in terms of fuel economy, load capability, smooth control, etc. The hydrostatic transmission (HST) systems have been widely adopted in off-road vehicles for providing large power density and continuous variable control, yet using relatively low efficiency hydraulic components. This paper presents a hydrostatic-mechanical power split transmission (PST) solution for a 10-ton wheel loader for improving the fuel economy of a wheel loader. A directly-engine-coupled HST solution for the same wheel loader is also presented for comparison. This work introduced a sizing approach for both PST and HST, which helps to make proper selections of key powertrain components. Furthermore, this work also presented a multi-domain modeling approach for the powertrain of a wheel loader, that integrates the modeling of internal combustion (IC) engine, hydraulic systems, mechanical transmission, vehicle(wheel) dynamics, and relevant control systems. In this modeling, an engine torque evaluation method with a throttle position control system was developed to describe the engine dynamics; a method to express the hydraulic loss of the axial piston hydraulic pump/motor was developed for modeling the hydraulic transmission; and a vehicle velocity control system was developed based on altering the displacement of a hydraulic unit. Two powertrain models were developed, respectively, for the PST and HST systems of a wheel loader using MATLAB/Simulink. The simulation on a predefined wheel loader drive cycle was conducted on both powertrain models to evaluate and compare the performance of wheel loader using different systems, including vehicle velocity, hydraulic displacement control, hydraulic torque, powertrain efficiency, and engine power consumption. The simulation results indicate that the vehicle velocity controller developed functions well for both the PST and HST systems; a wheel loader using the proposed PST solution can overall save about 8% energy consumption compared using an HST solution in one drive cycle. The sizing method and simulation models developed in this work should facilitate the development of the powertrains for wheel loaders and other wheeled heavy vehicles.

Real-Time Optimal Power Management for Hybrid Electric Vehicle Based on Prediction of Trip Information

2013 ◽  
Vol 321-324 ◽  
pp. 1539-1547 ◽  
Author(s):  
Li Cun Fang ◽  
Gang Xu ◽  
Tian Li Li ◽  
Ke Min Zhu
Keyword(s):  
Optimal Control ◽  
Real Time ◽  
Power Management ◽  
Fuel Economy ◽  
Control Strategy ◽  
Hybrid Electric Vehicle ◽  
Driving Cycle ◽  
Moving Window ◽  
Optimal Control Strategy ◽  
Time Optimal

Power management of hybrid electric vehicle (HEV) is an important operational factor for HEV to enhance fuel economy and reduce emissions. Optimal control for HEV requires the knowledge of entire driving cycle and elevation profile to obtain the optimal control strategy over fixed driving cycle. In this paper, the traffic knowledge extracted from intelligent transportation systems (ITSs),global positioning systems (GPSs) and geographical information systems (GISs) is used for predicting the knowledge of the future driving cycle, and the real-time optimal control strategy based on dynamic programming in a moving window is investigated in order to minimize fuel consumption. A simulation study was conducted for two driving cycles, and the results showed significant improvement in fuel economy compared with a rule-based control. Furthermore, the results showed that the distance of the moving window has obvious effect on the fuel economy.

Control of A Friction Launch Automatic Transmission Using a Range Clutch

2006 ◽  
Author(s):  
Chunhao J. Lee ◽  
Kumar Hebbale ◽  
Shushan Bai ◽  
Farzad Samie
Keyword(s):  
Robust Control ◽  
Fuel Economy ◽  
Control Strategy ◽  
Automatic Transmission ◽  
Torque Converter ◽  
Control Algorithms ◽  
Automatic Transmissions ◽  
Fuel Economy Improvement ◽  
Vehicle Test ◽  
Overall Ratio

Friction Launch transmissions use a wet multi-plate clutch to replace the torque converter in an automatic transmission. The main benefit of this technology is fuel economy improvement as a result of eliminating the losses in the torque converter. By using one of the range clutches inside the transmission instead of an input clutch in place of the converter, the benefits of this integrated friction launch technology, such as reduction in mass, packaging, and cost, can be enhanced. The availability of new automatic transmissions with higher number of speeds and wider overall ratio spreads makes this technology more viable than ever before. This project focuses on control issues with the friction launch clutch which include developing robust control algorithms for launch and creep, and providing damping to the driveline, when required, and ensuring acceptable vehicle drivability. This paper describes in detail the development of vehicle launch control algorithms. Vehicle test data is presented to show that the control strategy developed in this project significantly reduces the gap between the drivability of a starting clutch vehicle and a torque converter equipped vehicle.

Modeling and Simulation of Medium-Duty Tactical Truck for Fuel Economy Improvement

2010 ◽  
Author(s):  
Y. Gene Liao ◽  
Chih-Ping Yeh ◽  
Allen M. Quail
Keyword(s):  
Modeling And Simulation ◽  
Fuel Economy ◽  
Automatic Transmission ◽  
Vehicle Model ◽  
Model And Simulation ◽  
Vehicle Data ◽  
Experimental Vehicle ◽  
Shift Schedules ◽  
Fuel Economy Improvement ◽  
The Impact

The impact of the vehicle fuel economy in tactical convey is amplified due to the fact that much of the present logistics support is devoted to moving fuel. Fuel economy improvement on medium-duty tactical truck has and continues to be a significant initiative for the U. S. Army. The focus of this study is the investigation and analysis of Automated Manual Transmissions (AMT) that have potential to improve the fuel economy of the 2.5-ton cargo trucks. The current platform uses a seven-speed automatic transmission. This study utilized a combination of on-road experimental vehicle data and analytical vehicle model and simulation. This paper presented the results of (1) establishment of a validated, high fidelity baseline analytical vehicle model, (2) modeling and simulation of two AMTs and their control strategy, and (3) optimization of transmissions shift schedules to minimize the fuel consumption. The fuel economy discrepancy between experimental average and the baseline simulation result was 2.87%. The simulation results indicated a 12.2% and 14.5% fuel economy improvement for the 12-speed and 10-speed AMT respectively.

Research on Energy Saving Scheme of CVT in Automobile

2010 ◽  
Vol 37-38 ◽  
pp. 1017-1021
Author(s):  
Ping Yuan Xi ◽  
Limin Chen
Keyword(s):  
Energy Saving ◽  
Fuel Consumption ◽  
Fuel Economy ◽  
Control Strategy ◽  
Automatic Transmission ◽  
Mechanical Efficiency ◽  
Efficiency Curve ◽  
Variable Transmission ◽  
Optimal Efficiency ◽  
Continuous Range

The continuously variable transmission (CVT) offers the potential of allowing the engine operate near the optimal efficiency curve throughout a continuous range of velocity ratios. So the fuel economy of the automobile will be improved distinctly with the CVT having high mechanical efficiency. The double parameter shifting rule is used more frequently in the automatic transmission. The accurate model of CVT was developed and integrated with the control strategy in this paper. The CVT enables the engine to operate under the most economical conditions, which makes the fuel consumption be reduced and the efficiency be improved.

scholarly journals Loader power-split transmission system based on a planetary gear set

2018 ◽  
Vol 10 (1) ◽  
pp. 168781401774773 ◽  
Author(s):  
Chang Lyu ◽  
Zhao Yanqing ◽  
Lyu Meng
Keyword(s):  
Output Power ◽  
Fuel Economy ◽  
Power Transmission ◽  
Planetary Gear ◽  
Torque Converter ◽  
Transmission Efficiency ◽  
Transmission System ◽  
Mechanical Transmission ◽  
Power Split ◽  
Hydraulic Torque Converter

In hydraulic mechanical transmission loaders, a hydraulic torque converter can prevent an engine from stalling due to overloading of the loader during the spading process; however, the hydraulic torque converter also reduces the loader’s fuel economy because of its low transmission efficiency. To address this issue, the study designs an output-power-split transmission system that is applied to a hybrid loader. The designed transmission system removes the hydraulic torque converter in the power transmission system of a traditional loader and adopts a planetary gear set with a compact structure as the dynamic coupling element, thus allowing the output power of the loader to be split transmitted. During shoveling, the loader power-split transmission system based on a planetary gear set can prevent the motor from plugging and over-burning under conditions that ensure that the traction does not decrease. In addition, the transmission efficiency and loader fuel economy are higher in the proposed transmission system than in the power transmission system of a traditional loader. The test results show that the transmission efficiency of the designed system was 13.2% higher than that of the traditional hydraulic mechanical transmission loader.

Hydro-mechanical power split transmissions: Progress evolution and future trends

2018 ◽  
Vol 233 (3) ◽  
pp. 727-739 ◽  
Author(s):  
Jin Yu ◽  
Zhu Cao ◽  
Min Cheng ◽  
Rongzhao Pan
Keyword(s):  
High Efficiency ◽  
Low Cost ◽  
Mechanical Power ◽  
Mechanical Transmission ◽  
Hydraulic Hybrid ◽  
The World ◽  
Power Split ◽  
Hybrid Transmission ◽  
Key Techniques ◽  
Important Form

The hydro-mechanical power split transmission is an important form of hydraulic hybrid transmission, combining the stepless speed characteristics of hydraulic transmission and the high efficiency of mechanical transmission. Recently, the hydro-mechanical power split transmission, with its relatively large potential for energy recovery and improving the environment, and its low cost, has attracted many scholars from all over the world. Because there are many types of hydro-mechanical power split transmission, the different forms are complex, and researchers across the world are relatively dispersed, it has experienced a long and arduous development process. Therefore, it is important to summarize the types, developments, and achievements of this transmission. From the recent literature at home and abroad, this paper summarizes developments, key techniques and trends, analyses problems and difficulties in design and application, discusses the methods for solving these problems, and provides references for the development and application of hydro-mechanical power split transmission.

On the design and tuning of the controllers in a power-split continuously variable transmission for agricultural tractors

2003 ◽  
Vol 217 (8) ◽  
pp. 745-759 ◽  
Author(s):  
S M Savaresi ◽  
F Taroni ◽  
F Prevedi ◽  
S Bittanti
Keyword(s):  
High Efficiency ◽  
Continuously Variable Transmission ◽  
System Structure ◽  
Transmission Ratio ◽  
Mechanical Transmission ◽  
Power Split ◽  
Variable Transmission ◽  
Servo Controller ◽  
Automatic Controllers ◽  
Agricultural Tractors

In this work, a power-split continuously variable transmission (CVT) used in high-power tractors is considered. Power-split CVTs are characterized by the combination of a traditional discontinuous mechanical transmission and a continuously variable transmission. This provides, at the same time, smooth variations of the transmission ratio and high efficiency of the overall transmission system. The CVT considered in this paper is a hydrostatic power-split unit conceived for top-power agricultural tractors. The goal of this paper is to present a case study on the design and tuning of the control system structure for this type of CVT. This structure consists of three main parts: a servo controller on the internal current of the valve of the hydraulic transmission; a servo controller on the hydraulic transmission ratio; a synchronizer which coordinates the hydraulic and the mechanical parts of the CVT. The design, tuning and testing of this set of automatic controllers is presented.

Integration of a Dual-Mode SI-HCCI Engine Into Various Vehicle Architectures

2011 ◽  
Author(s):  
Benjamin J. Lawler ◽  
Zoran S. Filipi
Keyword(s):  
Fuel Economy ◽  
Control Strategy ◽  
Planetary Gear ◽  
Dual Mode ◽  
Engine Operation ◽  
Conventional Vehicle ◽  
Hcci Engine ◽  
Parallel Hybrid ◽  
Power Split ◽  
Mode Transitions

A simulation study was performed to evaluate the potential fuel economy benefits of integrating a dual-mode SI-HCCI engine into various vehicle architectures. The vehicle configurations that were considered include a conventional vehicle, a mild parallel hybrid, and a power-split hybrid. The three configurations were modeled and compared in detail for a given engine size (2.0 L for the conventional vehicle, 2.0 L for the mild parallel, and 1.5 L for the power-split) over the EPA UDDS (city) and Highway cycles. The results show that the dual-mode engine in the conventional vehicle offers a modest gain in vehicle fuel economy of approximately 5–7%. The gains were modest due to an advanced 6-speed transmission and a practically-based shift schedule, with which only 30% of the operating points were in the HCCI range for the city cycle and 56% for the highway cycle. The mild parallel hybrid achieved 32% better fuel economy than the conventional vehicle, both with SI engines. For the dual-mode engine in the mild parallel hybrid, a specific control strategy was used to manipulate engine operation in an attempt to minimize the number of engine mode transitions and maximize the time spent in HCCI. The parallel hybrid with the dual-mode engine and modified control strategy provides dramatic improvements of up to 48% in city driving, demonstrating that the addition of HCCI has a more significant effect with parallel hybrids than conventional vehicles. The power-split hybrid simulation showed that adding a dual-mode engine had an insignificant effect on vehicle fuel economy, mostly due to the ability of the planetary gear set to act as an e-CVT and keep the engine at relatively high loads. Finally, a systematic study of engine sizing provides guidelines for selecting the best option for a given vehicle application by characterizing the vehicle level interactions, and their effect on fuel economy, over an engine displacement sweep.

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