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Configuration Synthesis and Performance Analysis of 9‑Speed Automatic Transmissions
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作者 Huafeng Ding Changwang Cai +2 位作者 Ziming Chen Tao Ke Bowen Mao 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2020年第3期97-117,共21页
Current research of automatic transmission(AT)mainly focuses on the improvement of driving performance,and configuration innovation is one of the main research directions.However,finding new configurations of ATs is o... Current research of automatic transmission(AT)mainly focuses on the improvement of driving performance,and configuration innovation is one of the main research directions.However,finding new configurations of ATs is one of the main limitations of configuration innovation.In the present study,epicyclic gear trains(EGTs)are applied to investigate mechanisms of 9-speed ATs.Then four kinematic configurations are proposed for automatic transitions.In order to evaluate the performance of proposed mechanisms,the lever analogy method is applied to conduct kinematic and mechanical analyses.The power flow analysis is conducted,and then transmission efficiencies are calculated based on the torque method.The comparative analysis between the proposed and existing mechanisms is carried out where obtained results show that proposed mechanisms have reasonable performance and can be used in ATs.The prototype of an AT is manufactured and the speed test is conducted,which proves the accuracy of analysis and the feasibility of proposed mechanisms. 展开更多
关键词 automatic transmission Epicyclic gear train Lever analogy Gear ratio Torque method
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Study on shift schedule saving energy of automatic transmission of ground vehicles 被引量:15
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作者 龚捷 赵丁选 +1 位作者 陈鹰 陈宁 《Journal of Zhejiang University Science》 EI CSCD 2004年第7期878-883,共6页
To improve ground vehicle efficiency, shift schedule energy saving was proposed for the ground vehicle automatic transmission by studying the function of the torque converter and transmission in the vehicular drivetra... To improve ground vehicle efficiency, shift schedule energy saving was proposed for the ground vehicle automatic transmission by studying the function of the torque converter and transmission in the vehicular drivetrain. The shift schedule can keep the torque converter working in the high efficiency range under all the working conditions except in the low efficiency range on the left when the transmission worked at the lowest shift, and in the low efficiency range on the right when the transmission worked at the highest shift. The shift quality key factors were analysed. The automatic trans-mission's bench-test adopting this shift schedule was made on the automatic transmission's test-bed. The experimental results showed that the shift schedule was correct and that the shift quality was controllable. 展开更多
关键词 Ground vehicle Hydrodynamic drive automatic transmission Shift schedule Saving energy Shift quality
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Design and dynamic simulation of hydraulic system of a new automatic transmission 被引量:15
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作者 王书翰 徐向阳 +3 位作者 刘艳芳 戴振坤 TEN BERGE P 曲巍 《Journal of Central South University》 SCIE EI CAS 2009年第4期697-701,共5页
A new hydraulic system of a novel automatic transmission (AT) was designed. The dimension and structure of valves and cylinders were designed by theoretical calculation. The dynamic simulation model of hydraulic syste... A new hydraulic system of a novel automatic transmission (AT) was designed. The dimension and structure of valves and cylinders were designed by theoretical calculation. The dynamic simulation model of hydraulic system of AT was established by ITI-SimulationX. Simulation results and theoretical design results were compared to confirm the simulation model. Based on the confirmed simulation model, the simulation results of pressure and flow of the hydraulic system were analyzed. The dynamic simulation method is very helpful for designing and analyzing the performance of hydraulic system and further optimization design. The theoretical design method and dynamic simulation model are feasible for the real industrial applications. The research results can be used in hydraulic system design and optimization. 展开更多
关键词 automatic transmission hydraulic system dynamic simulation
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Application of clutch to clutch gear shift technology for a new automatic transmission 被引量:5
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作者 鲁曦 王书翰 +1 位作者 刘艳芳 徐向阳 《Journal of Central South University》 SCIE EI CAS 2012年第10期2788-2796,共9页
For the purpose of engineering development for a new 8-step speed automatic transmission,a simplified dynamic model for this gearbox was established and key parameters which affected the shift quality were analyzed.Ai... For the purpose of engineering development for a new 8-step speed automatic transmission,a simplified dynamic model for this gearbox was established and key parameters which affected the shift quality were analyzed.Aiming at four different shift types,the ideal characteristics of shift clutch and engine control were set up.By using torque estimation method,PI slip control algorithm and engine coordinated control principle,the control model and transmission controller were well developed for three shift phases which included rapid-fill phase,torque phase and inertia phase.The testing environment on the rig and prototype vehicle level was built and the testing results obtained in ultimate condition could verify the accuracy and feasibility of this shift control strategy.The peak jerk during shift process was controlled within ±2 g/s where the smooth gearshift was obtained.The development proposal and algorithm have a high value for engineering application. 展开更多
关键词 automatic transmission shift clutch shift strategy vehicle testing peak jerk gearshift control algorithm
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FOUR-PARAMETER AUTOMATIC TRANSMISSION TECHNOLOGY FOR CONSTRUCTION VEHICLE BASED ON ELMAN RECURSIVE NEURAL NETWORK 被引量:6
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作者 ZHANG Hongyan ZHAO Dingxuan +1 位作者 TANG Xinxing Ding Chunfeng 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2008年第1期20-24,共5页
From the viewpoint of energy saving and improving transmission efficiency, the ZL50E wheel loader is taken as the study object. And the system model is analyzed based on the transmission system of the construction veh... From the viewpoint of energy saving and improving transmission efficiency, the ZL50E wheel loader is taken as the study object. And the system model is analyzed based on the transmission system of the construction vehicle. A new four-parameter shift schedule is presented, which can keep the torque converter working in the high efficiency area. The control algorithm based on the Elman recursive neural network is applied, and four-parameter control system is developed which is based on industrial computer. The system is used to collect data accurately and control 4D180 power-shift gearbox of ZL50E wheel loader shift timely. An experiment is done on automatic transmission test-bed, and the result indicates that the control system could reliably and safely work and improve the efficiency of hydraulic torque converter. Four-parameter shift strategy that takes into account the power consuming of the working pump has important operating significance and reflects the actual working status of construction vehicle. 展开更多
关键词 Construction vehicle Hydraulic transmission and control automatic transmission Elman recursive neural network
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Adaptive Clutch Engaging Process Control for Automatic Mechanical Transmission 被引量:12
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作者 刘海鸥 陈慧岩 +1 位作者 丁华荣 何忠波 《Journal of Beijing Institute of Technology》 EI CAS 2005年第2期170-174,共5页
Based on detail analysis of clutch engaging process control targets and adaptive demands, a control strategy which is based on speed signal, different from that of based on main clutch displacement signal, is put forw... Based on detail analysis of clutch engaging process control targets and adaptive demands, a control strategy which is based on speed signal, different from that of based on main clutch displacement signal, is put forward. It considers both jerk and slipping work which are the most commonly used quality evaluating indexes of vehicle starting phase. The adaptive control system and its reference model are discussed profoundly. Taking the adaptability to different starting gears and different road conditions as examples, some proving field test records are shown to illustrate the main clutch adaptive control strategy at starting phase. Proving field test gives acceptable results. 展开更多
关键词 automatic mechanical transmission(AMT) transmission technology adaptive control main clutch engagement
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STUDY ON SHIFT SCHEDULE AND SIMULATION OF AUTOMATIC TRANSMISSION 被引量:3
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作者 Gong Jie,Zhao Dingxuan (College of Mechanical Science and Engineering ,Jilin University) 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2001年第3期250-253,共4页
From the point of view of saving energy, a new shift schedule and auto-controlling strategy for automatic transmission are proposed. In order to verify this shift schedule, a simulation program using a software packag... From the point of view of saving energy, a new shift schedule and auto-controlling strategy for automatic transmission are proposed. In order to verify this shift schedule, a simulation program using a software package of Matlab/ Simulink is developed. The simulation results show the shift schedule is correct. This shift schedule has enriched the theory of vehicle automatic maneuvering and will improve the efficiency of hydrodynanic drive system of the vehicle. 展开更多
关键词 Engineering vehicle automatic transmission Shift schedule SIMULATION Saving energy
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STUDY ON SHIFT SCHEDULE OF AUTOMATIC TRANSMISSION TO IMPROVE ENGINEERING VEHICULAR EFFICIENCY 被引量:2
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作者 GongJie ZhaoDingxuan +2 位作者 HuangHaidong GongWenbin ChenYing 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2004年第1期124-126,共3页
New shift schedule for automatic transmission is proposed from the point ofview of saving energy. The bench-test of automatic shift adopting this shift schedule is done onautomatic transmission's test-bed. The exp... New shift schedule for automatic transmission is proposed from the point ofview of saving energy. The bench-test of automatic shift adopting this shift schedule is done onautomatic transmission's test-bed. The experimental results show the shift schedule is correct. Thisshift schedule has enriched the theory of vehicle automatic maneuvering and will improve theefficiency of hydrodynamic drive system of the vehicle. 展开更多
关键词 Engineering vehicle automatic transmission Shift schedule Saving energy
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Optimal tracking control for automatic transmission shift process 被引量:2
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作者 万国强 李克强 +2 位作者 裴玲 黄英 张付军 《Journal of Beijing Institute of Technology》 EI CAS 2015年第4期458-465,共8页
In order to improve the shift quality, a linear quadratic optimal tracking control algorithm for automatic transmission shift process is proposed. The dynamic equations of the shift process are derived using a Lagrang... In order to improve the shift quality, a linear quadratic optimal tracking control algorithm for automatic transmission shift process is proposed. The dynamic equations of the shift process are derived using a Lagrange method. And a powertrain model is built in the Matlab/Simulink and veri- fied by the measurements. Considering the shift jerk and friction loss during the shift process, the tracking trajectories of the turbine speed and output shaft speed are defined. Furthermore, the linear quadratic optimal tracking control performance index is proposed. Based on the Pontryagin' s mini- mum principle, the optimal control law of the shift process is presented. Finally, the simulation study of the 1 - 2 upshift process under different load conditions is carried out with the powertrain model. The simulation results demonstrate that the shift jerk and friction loss can be significantly re- duced by applying the proposed optimal tracking control method. 展开更多
关键词 POWERTRAIN automatic transmission shift process optimal tracking control
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Defect Analysis and Innovation Design of Synchronizer for Clutchless Automatic Mechanical Transmission 被引量:2
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作者 Lipeng Zhang Yunao Peng +1 位作者 Haojie Yang Shaohua Li 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2022年第1期238-254,共17页
The synchronizer is a key component of automatic mechanical transmission(AMT)equipped in electric vehicles,but the inertial lock-ring synchronizer(ILRS)commonly used there is not suitable especially for pure electric ... The synchronizer is a key component of automatic mechanical transmission(AMT)equipped in electric vehicles,but the inertial lock-ring synchronizer(ILRS)commonly used there is not suitable especially for pure electric vehicles without a clutch because of big shift impact.To make the shifting process rapid and smooth,a new synchronizer named pressure-controllable friction ring synchronizer(PCFRS)was designed.Initially,the inevitable shortcoming of ILRS was verified by simulation and test.Furthermore,the mechanical characteristics and advantages of the new synchronizer over ILRS were analyzed.Then,the formulations describing the dynamic transmission based on the working mechanism of the PCFRS were established.Finally,the shifting simulation results with PCFRS and ILRS based on the same operating conditions were compared and analyzed.The research shows that the PCFRS can meet the main shifting evaluation index of an AMT without complex control methods,as well as it takes only 0.2406 s to finish the comfortable and zero-speed-difference shifting.The shifting quality of PCFRS is better than that of the ILRS.It lays a foundation for using the new synchronizer as a part of clutchless AMTs equipped in pure electric vehicles. 展开更多
关键词 Electric vehicle Clutchless automatic mechanical transmission Inertial lock-ring synchronizer Pressure-controllable friction ring synchronizer Mechanical characteristics Shifting quality
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Design and application of electric oil pump in automatic transmission for efficiency improvement and start–stop function 被引量:1
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作者 刘艳芳 董鹏 +1 位作者 刘洋 徐向阳 《Journal of Central South University》 SCIE EI CAS CSCD 2016年第3期570-580,共11页
For the purpose of improving efficiency and realizing start–stop function, an electric oil pump(EOP) is integrated into an 8-speed automatic transmission(AT). A mathematical model is built to calculate the transmissi... For the purpose of improving efficiency and realizing start–stop function, an electric oil pump(EOP) is integrated into an 8-speed automatic transmission(AT). A mathematical model is built to calculate the transmission power loss and the hydraulic system leakage. Based on this model, a flow-based control strategy is developed for EOP to satisfy the system flow requirement. This control strategy is verified through the forward driving simulation. The results indicate that there is a best combination for the size of mechanical oil pump(MOP) and EOP in terms of minimum energy consumption. In order to get a quick and smooth starting process, control strategies of the EOP and the on-coming clutch are proposed. The test environment on a prototype vehicle is built to verify the feasibility of the integrated EOP and its control strategies. The results show that the selected EOP can satisfy the flow requirement and a quick and smooth starting performance is achieved in the start–stop function. This research has a high value for the forward design of EOP in automatic transmissions with respect to efficiency improvement and start–stop function. 展开更多
关键词 automatic transmission electric oil pump mechanical oil pump start-stop function efficiency improvement forwarddriving simulation control strategy
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OPTIMAL TORQUE CONTROL STRATEGY FOR PARALLEL HYBRID ELECTRIC VEHICLE WITH AUTOMATIC MECHANICAL TRANSMISSION 被引量:12
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作者 GU Yanchun YIN Chengliang ZHANG Jianwu 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2007年第1期16-20,共5页
In parallel hybrid electrical vehicle (PHEV) equipped with automatic mechanical transmission (AMT), the driving smoothness and the clutch abrasion are the primary considerations for powertrain control during gears... In parallel hybrid electrical vehicle (PHEV) equipped with automatic mechanical transmission (AMT), the driving smoothness and the clutch abrasion are the primary considerations for powertrain control during gearshift and clutch operation. To improve these performance indexes of PHEV, a coordinated control system is proposed through the analyzing of HEV powertrain dynamic characteristics. Using the method of minimum principle, the input torque of transmission is optimized to improve the driving smoothness of vehicle. Using the methods of fuzzy logic and fuzzy-PID, the engaging speed of clutch and the throttle opening of engine are manipulated to ensure the smoothness of clutch engagement and reduce the abrasion of clutch friction plates. The motor provides the difference between the required input torque of transmission and the torque transmitted through clutch plates. Results of simulation and experiments show that the proposed control strategy performs better than the contrastive control system, the smoothness of driving and the abrasion of clutch can be improved simultaneously. 展开更多
关键词 Parallel hybrid electric vehicle (PHEV) automatic mechanical transmission (AMT) Driving smoothness Clutch abrasion Optimal control Fuzzy logic control
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Desktop calibration of automatic transmission for passenger vehicle 被引量:1
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作者 FANG Chi SHI Jian-peng 王军 《Journal of Chongqing University》 CAS 2014年第1期26-32,共7页
Desktop calibration of automatic transmission(AT) is a method which can reduce cost, enhance efficiency and shorten the development periods of a vehicle effectively. We primary introduced the principle and approach of... Desktop calibration of automatic transmission(AT) is a method which can reduce cost, enhance efficiency and shorten the development periods of a vehicle effectively. We primary introduced the principle and approach of desktop calibration of AT based on the condition of coupling characteristics between engine and torque converter and obtained right point exactly. It is shown to agree with experimental measurements reasonably well. It was used in different applications abroad based on AT technology and achieved a good performance of the vehicle compared with traditional AT technology which primary focuses on the drivability, performance and fuel consumption. 展开更多
关键词 automatic transmission desktop calibration shift pattern DRIVABILITY fuel consumption
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Hydraulic and thermal analysis of automatic transmission fluid in the presence of nano-particles and twisted tape:An experimental and numerical study
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作者 Ali QASEMIAN Faranak MORADI +2 位作者 Amin KARAMATI Ali KESHAVARZ Amin SHAKERI 《Journal of Central South University》 SCIE EI CAS CSCD 2021年第11期3404-3417,共14页
In the present study,hydraulic and thermal behavior of an automatic transmission nano-fluid(ATNF) inside a tube with a twisted tape has been investigated.The heat transfer improvement and pressure drop of transmission... In the present study,hydraulic and thermal behavior of an automatic transmission nano-fluid(ATNF) inside a tube with a twisted tape has been investigated.The heat transfer improvement and pressure drop of transmission oil for each of case of using twisted tape and nano-particles were also examined separately and compared with each other.The Cu O nano-particles were used to prepare the ATNF.The effects of different Reynolds numbers and different mass fractions of nano-particle were investigated.The results showed that applying nano-particles and twisted tape simultaneously increases both the pressure drop and Nusselt number,on average by about 53% and 76%,respectively.By using a parameter,namely thermal performance index η,the effect of increasing heat transfer and pressure drop was studied simultaneously.The heat transfer improvement predominates the pressure drop increment in all cases.It was observed that the highest thermal performance of 1.9 was obtained at Re=634 and Φ=2%.Furthermore,regarding the increment of the Nu number,it was shown that the use of twisted tapes individually could increase the average Nu number by 41%,while the max increment arising from individual use of 2% nano-particles is 13%,so using twisted tape is a more effective-technique for this case study. 展开更多
关键词 automatic transmission fluid(ATF) NANOFLUID twisted tape heat transfer thermal performance
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Analysis on the gear-shifting schedule of hydraulic automatic transmission
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作者 席军强 唐高强 +2 位作者 翟涌 张国鑫 顾宏弢 《Journal of Beijing Institute of Technology》 EI CAS 2016年第1期42-48,共7页
With an advanced foreign hydraulic automatic transmission as the objective,an analytical method for the gear-shifting schedule is proposed.First the demanded maximum gradient of test is estimated.Then a test scheme an... With an advanced foreign hydraulic automatic transmission as the objective,an analytical method for the gear-shifting schedule is proposed.First the demanded maximum gradient of test is estimated.Then a test scheme and analytical procedure is formulated by initial test and hypothetical shift parameters.Finally through gear-shifting tests under different road conditions,load,accelerator pedal position limitation,throttle opening and output shaft speed are found to be the gear-shifting parameters.Under a common road condition,the gear-shifting schedule is a double-parameter schedule.Based on the driver's demands on braking and dynamic performance,different shift schedules are made under downhill,uphill and quick releasing acceleration pedal conditions.The operation criteria of down-shift schedule on abrupt grade are proposed. 展开更多
关键词 hydraulic automatic transmission vehicle test gear-shifting parameters gear-shift schedule
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A Brief Analysis on BMW'S Automatic Transmission Problems and Treatment
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作者 Chao Chen 《International Journal of Technology Management》 2013年第3期14-15,共2页
the article analyses the principles AT work, and a detailed analysis of BMW's automatic transmission failures, and maintenance process.Maintenance of other automatic transmission provides a certain degree of signific... the article analyses the principles AT work, and a detailed analysis of BMW's automatic transmission failures, and maintenance process.Maintenance of other automatic transmission provides a certain degree of significance. 展开更多
关键词 automatic transmission thilure analysis lault example
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Study of Controlling Clutch Engagement for AMT Based on Fuzzy Logic 被引量:16
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作者 汤霞清 侯朝桢 陈云窗 《Journal of Beijing Institute of Technology》 EI CAS 2002年第1期45-49,共5页
The control of the clutch engagement for an automatic mechanical transmission in the process of a tracklayer getting to start is studied. The dynamic model of power transmission and automatic clutch system is develope... The control of the clutch engagement for an automatic mechanical transmission in the process of a tracklayer getting to start is studied. The dynamic model of power transmission and automatic clutch system is developed. Using tools of Simulink, the transient characteristics during the vehicle starting, including the jerk and the clutch slip time, are provided here. Based on the analyses of the simulation results and driver’s experiences, a fuzzy controller is designed to control the clutch engagement. Simulation results verify its value. 展开更多
关键词 CLUTCH automatic transmission fuzzy control
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Methods for the Gear-Position Decision in AMT 被引量:4
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作者 孙以泽 熊伟 姚玉峰 《Journal of Beijing Institute of Technology》 EI CAS 2003年第2期220-224,共5页
Aimed at defects of the gear position decision in an automatic mechanical transmission, a method of synthetic shift schedule of 5 speed gear position is presented, which is based on the fuzzy discernment of the dri... Aimed at defects of the gear position decision in an automatic mechanical transmission, a method of synthetic shift schedule of 5 speed gear position is presented, which is based on the fuzzy discernment of the driver intention and the road characteristics. A contrastive experimental analysis between the synthetic gear position decision method and the traditional gear position decision method is given by analyzing Santana 2000. 展开更多
关键词 automatic mechanical transmission gear position decision synthetic shift schedule
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VEHICLE SIMULATION MODEL FOR DEVELOPING AN INTELLIGENT SLOPE SHIFT STRATEGY 被引量:2
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作者 JinHui GeAnlin 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2004年第2期193-196,共4页
With the rapid development of electronics and the growing demand for highervehicle performance, intelligent shift technology is becoming increasingly important, and itpromises to be a developing trend in vehicle autom... With the rapid development of electronics and the growing demand for highervehicle performance, intelligent shift technology is becoming increasingly important, and itpromises to be a developing trend in vehicle automatic transmissions, A new simulation model ispresented, which includes engine, powertrain, tire and vehicle dynamics models. Based on the model,simulation experiments are conducted to investigate the slope shift strategy. The data andconclusions obtained from the simulations are valuable contributions to the development of anintelligent slope shift strategy. 展开更多
关键词 automatic transmission Intelligent shift Slope shift strategy Simulationmodel
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Development of calibration system for transmission control unit of AT based on XCP 被引量:1
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作者 陶刚 李德晴 +1 位作者 马岳峰 段丽娟 《Journal of Beijing Institute of Technology》 EI CAS 2013年第1期28-34,共7页
To guarantee control system's performance and shorten the development cycle during the development process of hydraulic automatic transmission, a calibration system on CAN for high-pow- er AT ECU is designed based on... To guarantee control system's performance and shorten the development cycle during the development process of hydraulic automatic transmission, a calibration system on CAN for high-pow- er AT ECU is designed based on XCP. In this system, it is possible that the master dynamically searching the slaves available on bus and data synchronization between master and slave is also achieved. Real-time measurement and on-line calibration can be executed during the running process of transmission control unit, so the calibration result is displayed in time. Calibration by true value and physical value are both available. Experimental results showed that this system operated stably and reliably and had strong timeout handling ability. 展开更多
关键词 automatic transmission calibration system calibration protocol transmission controlunit
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