Design, modeling, and analysis of wedge-based actuator with application to clutch-to-clutch shift
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Abstract:
Clutch-to-clutch shift technology is a key enabler for fast and smooth gear shift process for multi gear transmissions. However, conventional hydraulic actuation systems for clutches have drawbacks of low efficiency, oil leakage and inadequate robustness. Electromechanical devices offer potential alternative actuators. In this paper, a novel motor driven wedge-based clutch actuator, featuring self-reinforcement, is proposed. The design concept and physical structure are thoroughly described. Dynamic models for the actuation system and vehicle powertrain are validated by experiments. Upshift and downshift processes at different engine throttle openings, clutch clearances and friction coefficients are discussed. The results show that, the self-reinforcement ratio is tested as 9.6; at the same time, the shift quality is comparable to that of the conventional hydraulic actuated clutch in automatic transmissions in terms of the shift duration (about 1 s) and vehicle jerk (<10 m/s 3 ). Taking advantage of fast response of the actuation DC motor, the wedge-based actuator is robust dealing with uncertain clutch clearance and friction coefficient. Therefore, the wedge-based clutch actuator has potential to provide acceptable performance for clutch-to-clutch shift.Keywords:
Powertrain
Jerk
Robustness
Control of Clutch is important on the development of Automated Mechanical Transmission (AMT). The course of clutch engaged is studied to solve the problem of clutch control. Mathematical model of Clutch work is constructed. The friction work and the jerk degree of clutch are studied. And a simulation software is developed, which can calculate the friction work and the jerk degree. The characteristic curve of clutch can be gotten by using the simulation software. The software is helpful to the development of automated clutch.
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Simulation software
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The basic structure of ISG HEV and the function of energy-saving clutch is introduced in this paper. Based on the dynamics analysis of the clutch engaging process, educed formula of jerk. Analysed the 4 phase of the clutch engaging process. Summed up the control principia of the clutch engagement speed. This method is applied to study on Jingang HEV, and it is proven that changing the clutch engagement speed can reduce the degree of jerk.
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The basic structure of ISG hybrid electric vehicle(HEV)and the function of saving energy clutch were introduced.Based on the dynamics analysis of the clutch engaging process,the formula of jerk degree was deduced.Analyzing the 4 phases of the clutch engaging process,the control principle of the clutch engagement speed was summed up.This method was applied to study Jingang HEV.It is proven that changing the clutch engagement speed can reduce the degree of jerk.
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This paper proposes a new type of hybrid powertrain with a specially designed double-clutch transmission. Compared with the existing hybrid powertrains, the proposed solution with double-clutch transmission, based on innovative double-clutch and mechanical gear sets, has the potential to achieve higher levels of performance efficiency at a lower production cost. The impact factors of system efficiency are analysed on a dynamic non-linear simulation model. The control strategies of powertrain and the double-clutch transmission gear ratios are studied by simulation results. Additionally, the double-clutch transmission can increase the efficiency of regenerative braking.
Powertrain
Manual transmission
Continuously variable transmission
Automatic transmission
Torque converter
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This paper analyses two evaluating indicators: the starting jerk and the friction work in clutch engaging process.The clutch engaging displacement and speed are considered as the controlled parameters and the engaging method of fast-slow-fast is obtained based on analyzing the clutch launching engagement process and the SRV AMT test data.At the end,the paper points out the crucial control phase and the control method for the clutch launching.
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Wet clutches in an automatic transmission enable the transmission of the engine power by the frictional torque experienced and noted between disk and plates. Since the clutch frictional torque considerably affects the shift quality of an automatic transmission as well as the durability of the machinery, its friction characteristics must be carefully examined to meet the design requirements. The SAE No. 2 friction test machine is a well-known standard to evaluate mainly the friction characteristics of plate clutches along with the required automatic transmission fluids. This paper reviews the experimental analysis of the wet clutch friction characteristics by using the exclusively developed clutch test machine which is capable of controlling the clutch test procedure, in accordance with the applicable test standard and processing of the experimental data automatically. As the clutch test machine is designed for the accommodation of dual clutches which is applied to the real transmission, it can evaluate not only the clutch friction characteristics, but also an actuation performance of a measured clutch piston. In respect to friction characteristics involving dynamic friction coefficients, the energy absorbed in a clutch disk and the recorded temperatures of clutch plates during braking actions and procedures are also investigated. Additionally, the change of friction coefficients by the use of the repeated clutch application is also observed with the endurance test functions of an accurately calibrated and dedicated clutch test machine.
Automatic transmission
Torque converter
Piston (optics)
Friction torque
Manual transmission
Power transmission
Friction loss
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Jerk
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Clutch control is an important aspect of automated mechanical transmissions. Control theory and technology were studied to solve the problem of clutch control. Control theory was used to develop a model of the clutch mechanism and the control methodology to study the friction work and the starting jerk. The jerk of cluth at each gear was studied by way of combining human subjective evaluation and test data together, and a rule optimizing the clutch control at each gear was given according to the test result. The control method can be used for optimized clutch control.
Jerk
Manual transmission
Mechanical transmission
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This paper proposes a new type of hybrid powertrain with a specially designed double-clutch transmission. Compared with the existing hybrid powertrains, the proposed solution with double-clutch transmission, based on innovative double-clutch and mechanical gear sets, has the potential to achieve higher levels of performance efficiency at a lower production cost. The impact factors of system efficiency are analysed on a dynamic non-linear simulation model. The control strategies of powertrain and the double-clutch transmission gear ratios are studied by simulation results. Additionally, the double-clutch transmission can increase the efficiency of regenerative braking.
Powertrain
Manual transmission
Continuously variable transmission
Automatic transmission
Torque converter
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Multi-speed transmissions can enhance the performance and reduce the overall cost of an electric vehicle, but they also introduce a challenge: avoiding gearshift jerk, which may sometimes prove to be impossible in the presence of motor and clutch saturation. In this article, we introduce three theorems that explicitly define the fundamental limitations to no-jerk gearshifts resulting from motor or actuator saturation. We compare gearshifts that consist of transferring transmission torque from one friction clutch to another, to the case in which one of the clutches is a one-way clutch. We show that systems with a one-way clutch are more prone to motor saturation, thus gearshift jerk is more often inevitable. We also study the influence of planetary gearsets on the gearshift dynamical trajectories, and expose the impact on the no-jerk limitations. This work offers tools to compare transmission architectures during the conceptual design phase of a new electric vehicle.
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