Study on Transmission Characteristics of Torque for AMT Clutch Engagement
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This paper analyzed the influence between pressure on the diaphragm spring and the transmission torque of AMT,and simulated the relationship between the pressure on the diaphragm and the transmission torque during the AMT clutch engagement.Compared the simulation results and the results based on the test bench,it indicated that the model could accurately simulate the engagement of the transmission characteristics of torque,and therefore it provided the theoretical basis for automatic control of AMT clutch.Keywords:
Automatic transmission
Torque converter
Test bench
Manual transmission
Diaphragm (acoustics)
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Clutch characters vary largely during the series production and the longtime running because of wear. A clutch control method based on pressure control was suggested to solve these problems. Independent from the manufacture tolerance and running wear,this method controls directly the torque transferred by the clutch,and improves the clutch control quality of AMT effectively. This is helpful for the series production conformity of the AMT.
Pressure Control
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In order to avoid reducing the control accuracy of the clutch of AMT during starting,a clutch control method based on pressure was presented. The combined pressure of clutch was used as control objective to control the torque transmission in the new control method. The loss of torque and the decline of control accuracy caused by wear of clutch were avoided effectively. The simulation results show that the control method based on pressure of clutch can ensure the control precision when the clutch appears wear.
Pressure Control
Manual transmission
Torque converter
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Wet clutch is an important shifting component in automatic transmission,and its properties will affect the gear shift performance. By comparing the calculated and test results,the static friction torque model was proved to be capable of describing the real pressure and torque only in the situation of high-energy engagement.Therefore,a dynamic torque model was proposed on basis of hydrodynamic properties between friction surfaces, in which the clutch engagement was divided into three phases for hydrodynamic lubrication, mixed lubrication, and mechanical contact. The proposed dynamic torque model was validated by comparing the calculated and test results. The effects of temperature,pressure,and pressure changing rate of automatic transmission fluid( ATF) on the clutch torque were analyzed. Based on these results,the clutchto-clutch torque control during shifting in automatic transmission was optimized,and as a result,the shifting comfort was significantly improved since the problems such as the fluctuation and sudden drop of the engine rotating speed during shifting were eliminated.
Automatic transmission
Torque converter
Stall torque
Friction torque
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Torque converter
Decoupling (probability)
Powertrain
Manual transmission
Transmissibility (structural dynamics)
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In this paper,two key factors affecting the clutch torque are proposed:pressing force on the friction disk and its friction coefficient.In view of a dry,normally disengaged and push-type dual-clutch,analyzed the different states of the clutch during the engagement process.On this basis,the pressing force and the friction coefficient of the two clutches are analyzed.At last,a dualclutch-torque transmission model is built,and it clarified the relationship between the torque transmitted,the placement of the piston rod in the clutch hydraulic cylinder and the rotational speed difference of the clutch driving and driven plate.
Piston (optics)
Torque converter
Manual transmission
Piston rod
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With the rise in oil prices and ongoing concerns about environment, there is an increased amount of interest in automated manual transmission (AMT) vehicles. Torque control in an AMT vehicle is attained by controlling the displacement of the dry-type clutch's actuator. To provide good ride comfort akin to that of an automatic transmission vehicle, the clutch control is vital to an AMT vehicle. In this study, a method of obtaining the clutch torque from a dynamometer test is devised. This method is able to identify the relationship between the displacement of the clutch actuator and the clutch torque. A simulator for estimating the performance of an AMT vehicle is developed using MATLAB Simulink. The results obtained from both the vehicle and simulation exhibit a similar trend.
Dynamometer
Manual transmission
Automatic transmission
Torque converter
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In order to improve the shift quality of AMT with wet clutch, drag torque characteristic of wet clutch was proposed. Working principle of the drag torque with wet clutch are analyzed, and the dynamic calculation model is built. Principle and model of synchronizer are analyzed. The dynamics equations of the system and the control strategy for the gear shifting were established. Based on the target vehicle, the simulation mode was set up with Matlab /Simulink software. The results showed the drag torque can be used to synchronize transmission speed and satisfy the requirement of speed matching to target gear in shifting process.
Synchronizer
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Recent evolutions in the developments of automated dry clutches and the associated control algorithms has led to a rapid diffusion of this transmission type. However the chosen control strategy affects strongly the passenger's comfort and moreover the control action, particularly with regard to the clutch engagement, is influenced by the clutch torque characteristic model implemented in the Transmission Control Unit (TCU). Thus, to use a phenomenological approach to model the torque transmitted by the specific clutch architecture is a crucial issue in order to design robust engagement control strategies. Thus, to use a phenomenological approach to model the torque transmitted by the specific clutch architecture is a crucial step in order to design robust engagement control strategies.
Manual transmission
Torque converter
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Citations (10)