scholarly journals Variable-capacity matching of continuously variable-capacity double-impeller torque converter applied to a loader

2017 ◽  
Vol 9 (2) ◽  
pp. 168781401769069 ◽  
Author(s):  
Wen-Xing Ma ◽  
Wen Xu ◽  
Wei Cai ◽  
Li-peng You
Keyword(s):  
Working Conditions ◽  
Fuel Economy ◽  
Torque Converter ◽  
Power Performance ◽  
Dynamic Variable ◽  
Operating Cycle ◽  
State Dynamic ◽  
Variable Capacity ◽  
Matching Performance

Variable-capacity matching of continuously variable-capacity double-impeller torque converter applied to a loader was studied in the article. Static variable-capacity matching of continuously variable-capacity double-impeller torque converter was performed under the two-impeller state and slipping state. Dynamic variable-capacity matching based on the V-shaped operating cycle was simulated in order to reflect the matching performance of the double-impeller torque converter more intuitively. The working speed of double-impeller torque converter together with engine was analyzed when the loader shoveled different materials, and the power performance and fuel economy of the whole machine were calculated. The continuously variable-capacity double-impeller torque converter applied to a loader could not only meet the requirements of matching different loader working conditions but also enhances the power performance and fuel economy of the whole machine in running condition compared with the original torque converter.

Performance improvement and flow field investigation in hydraulic torque converter based on a new design of segmented blades

2020 ◽  
Vol 234 (8) ◽  
pp. 2162-2175
Author(s):  
Chunbao Liu ◽  
Konghua Yang ◽  
Jing Li ◽  
Zhixuan Xu ◽  
Tongjian Wang
Keyword(s):  
Turbine Blade ◽  
Fuel Economy ◽  
Transient Flow ◽  
Torque Converter ◽  
Transmission Efficiency ◽  
Maximum Efficiency ◽  
Speed Ratio ◽  
Start Up ◽  
Computational Fluid Dynamics Analysis ◽  
Hydraulic Torque Converter

Hydraulic torque converter is of lower efficiency in the powertrain, particularly at low speed ratio, which is crucial for vehicles due to its ability of torque multiplication. Therefore, torque converters should be taken into account with both higher start-up acceleration and transmission efficiency. Inspired by the fact that the multi-airfoils of the aircraft can improve the lift, a new design of segmented turbine blade in torque converter is presented to improve the transmission efficiency and start-up acceleration. To ensure reproducibility and popularization, the camber line and shape of blades are extracted to obtain the expression in the Cartesian coordinate system. A scale-resolving simulation setting, large eddy simulation with kinetic energy transport, and refined hexahedron meshes, which were verified by our studies, are applied to simulate the three-dimensional transient flow numerically. According to the results of computational fluid dynamics analysis, the new design eliminated the ultra-high vorticity of the near-wall boundary layer to reduce the flow loss, which further improves fuel economy. The pressure difference in the segmented turbine blade is significantly higher than that of the original model, causing the improvement of powertrain performance. As a result, the torque ratio and nominal torque increase by 6.7% and 7.7%, respectively, at stalling speed ratio; meanwhile, the maximum efficiency increases by 1.1%. This research, using a new design of segmented blades, has many advantages, such as high starting torque ratio, large adjusting range, and greater fuel economy, and shows great potential to apply in the manufacturing process.

Torque Converter Clutch Optimization: Improving Fuel Economy and Reducing Noise and Vibration

2011 ◽  
Vol 4 (1) ◽  
pp. 94-105 ◽  
Author(s):  
Darrell Robinette ◽  
Michael Grimmer ◽  
Jeremy Horgan ◽  
Jevon Kennell ◽  
Richard Vykydal
Keyword(s):  
Fuel Economy ◽  
Torque Converter ◽  
Noise And Vibration

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.

scholarly journals Experimental study on the effects of the Miller cycle on the performance and emissions of a downsized turbocharged gasoline direct injection engine

2020 ◽  
Vol 12 (5) ◽  
pp. 168781402091872
Author(s):  
Zhao-Ming Huang ◽  
Kai Shen ◽  
Li Wang ◽  
Wei-Guo Chen ◽  
Jin-Yuan Pan
Keyword(s):  
Compression Ratio ◽  
Fuel Economy ◽  
Direct Injection ◽  
Gasoline Direct Injection ◽  
Miller Cycle ◽  
Power Performance ◽  
Direct Injection Engine ◽  
Performance And Emission ◽  
Gasoline Direct Injection Engine ◽  
Partial Load

The Miller cycle has been proven to be an effective way to improve the thermal efficiency for gasoline engines. However, it may show insufficient power performance at certain loads. In this study, the objective is to exploit the advantages of the Miller-cycle engines over the original Otto-cycle engines. Therefore, a new camshaft profile with early intake valve closure was devised, and two various pistons were redesigned to obtain higher compression ratio 11.2 and 12.1, based on the original engine with compression ratio 10. Then, a detailed comparative investigation of the effects of Miller cycle combined with higher compression ratio on the performance and emission of a turbocharged gasoline direct injection engine has been experimentally carried out based on the engine bench at full and partial loads, compared to the original engine. The results show that, at full load, for a turbocharged gasoline direct injection engine utilizing the Miller cycle, partial maximum power is compromised about 1.5% while fuel consumption shows a strong correlation with engine speed. At partial load, since the Miller effect can well reduce the pumping mean effective pressure, thus improves the fuel economy effectively. In addition, the suppression of the in-cylinder combustion temperature induced by the lower effective compression ratio contributes to the reduction of nitrogen oxide emission greatly. However, the total hydrocarbon emission increases slightly. Therefore, a combination of the Miller cycle and highly boosted turbocharger shows great potential in further improvement of fuel economy and anti-knock performance for downsized gasoline direct injection engines.

Modeling, calculation, and analysis of torsional vibration characteristics of the hydrodynamic transmission system in engineering vehicle

2021 ◽  
pp. 095440702110458
Author(s):  
Wenxing Ma ◽  
Dapeng Xie ◽  
Zhihao Wang ◽  
Zilin Ran ◽  
Chunbao Liu ◽  
...  
Keyword(s):  
Natural Frequency ◽  
Working Conditions ◽  
Torsional Vibration ◽  
Variable Stiffness ◽  
Torque Converter ◽  
Transmission System ◽  
Speed Ratio ◽  
Resonance Modes ◽  
Variable Damping ◽  
Vibration Simulation

According to the typical working conditions of a loader and considering the complexity of the working conditions, the hydrodynamic transmission powertrain system was modeled in this study. Because the hydrodynamic torque converter is a flexible fluid transmission component in the transmission system, this study proposes and establishes equivalent variable damping and equivalent variable stiffness models of the hydrodynamic torque converter. Based on this, a torsional vibration simulation model of the loader with variable damping and stiffness is proposed, and the frequencies and amplitudes of the torsional resonance modes of the transmission system varying with engine speed and hydrodynamic torque converter speed ratio are obtained. It is determined that the variable stiffness of the hydrodynamic torque converter has little effect on the natural frequency of the vehicle, and taking variable damping and stiffness as input, the natural frequency and resonance points of the transmission system can be calculated more accurately. The simulation modeling and calculation approach are experimentally verified, and the simulation results are valid and closer to the real resonance.

Speed Sensitive Air Conditioning System for Fuel Economy and Power Performance

ATZ worldwide ◽  
2011 ◽  
Vol 113 (11) ◽  
pp. 38-43
Author(s):  
Changwon Lee ◽  
Kilyong Jang ◽  
Chunkyu Kwon ◽  
Jaewoong Kim
Keyword(s):  
Fuel Economy ◽  
Air Conditioning ◽  
Power Performance ◽  
Air Conditioning System

Simulation and Matching for the Powertrain System of Saloons

2012 ◽  
Vol 510 ◽  
pp. 222-226
Author(s):  
Jie Zang ◽  
De Sheng Zhang ◽  
Yuan Tao Sun ◽  
Song Tao Lv
Keyword(s):  
Fuel Economy ◽  
Evaluation System ◽  
Performance Model ◽  
Optimized Design ◽  
Power Performance ◽  
Vehicle Performance ◽  
Complete Vehicle ◽  
Powertrain System ◽  
Index Evaluation ◽  
Index Evaluation System

Reasonable match of the powertrain system is an optimized design process, which makes the saloons fuel economy low and power performance good. This document simulates the complete vehicle performance model of a specified manual transmission FF saloon by means of CRUISE. Establish 4 kinds of simulation task, select 3 kinds of engine whose displacement are 1.3 liters, 1.1liters and 1.0liters, 4 kinds of transmission and 4 kinds of main decelerator, calculate the power performance and fuel economy of saloon with 48 different kinds of alternative schemes on transmission system by CRUISE and analyze all the simulation results. A synthetic weighting index evaluation system of complete vehicle performance is created, which contains the design of evaluation indices and weighting indices. Analyze the weighting indices to obtain 5 design schemes which are superior to others. It offers reference data for saloon performance.

The Simulation for Automobile Power Performance and Fuel Economy

2012 ◽  
Vol 253-255 ◽  
pp. 2135-2138
Author(s):  
Wen Chen
Keyword(s):  
Mathematical Model ◽  
Fuel Economy ◽  
Weight Distribution ◽  
Power Performance ◽  
Dynamic Calculation ◽  
Power Train ◽  
Reference Guide ◽  
Automobile Design ◽  
Chief Factors ◽  
Good Agreement

The power performance and the fuel economy are both the important indexes of the automobile. To designing a certain vehicle, when the total weight, distribution of the load and the tyres are specified, in traditional ways, it needs to do a lot of the dynamic calculation work and numerous experiments to get the parameters of proper engine and power train. This paper, Based on mathematical model, the simulation for automobile power performance and economy is designed. The calculation on actual vehicle is taken with this software and calculated values are in good agreement with the practical data. The analysis of influence of some chief factors on automobile power performance and fuel economy is carried out, which can provide the reference guide for automobile design.

The Technical Modification and Performance Analysis of Diesel/LNG Dual Fuel Engines

2013 ◽  
Vol 724-725 ◽  
pp. 1383-1388 ◽  
Author(s):  
Chao Meng ◽  
Jing Ping Si ◽  
Ge Xi Liang ◽  
Jia Hua Niu
Keyword(s):  
Natural Gas ◽  
Fuel Economy ◽  
Alternative Fuels ◽  
Low Cost ◽  
Bench Test ◽  
Dual Fuel ◽  
Power Performance ◽  
Dual Fuel Engines ◽  
Gas Fuel ◽  
And Performance

As the global shortage of oil resource and the rapid increase in car ownership, using gas as the alternative fuel is getting more and more important. Gas fuel, such as LNG (liquefied natural gas), with resource-rich, less pollution and other features, is desirable alternative fuels for cars. In this article, through the engine bench test, a comparative analysis of power performance, fuel economy, emission between diesel/LNG dual engine and diesel engine was done. The result shows that, compared to the original machine , power performance of modified diesel / LNG dual fuel engine decline but isnt obvious. At the same time , fuel economy has a substantial increase. The use of natural gas can relieve shortage of global oil resource and the supply-demand imbalance of oil products. The emission of modified diesel / LNG dual fuel engine has a better state than that of original machines. This kind of modified dual fuel engine is simple, low cost, easily promoted and will be well utilized in future.

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.

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