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Abstract
The identification problem of the load parameters is the basis of researching the clutch control strategy and the shift schedule for heavy-duty AMT (Automated Mechanical Transmission). AMT is proposed as the soft starter for the belt conveyor which expands AMT application areas. In order to accomplish the goal of AMT as the soft starter, the load parameters estimation methods including the load resistance torque and the load inertia are firstly studied to accommodate the actual control for AMT startup as the soft starter for belt conveyor. In the paper, the estimation models of the load resistance torque and the load inertia are established during AMT startup for belt conveyor. On the basis of the recursion least squares method, the on-line estimations for the load parameters are recognized according to the test data during AMT startup. The estimation results of these two parameters prove that the load parameters estimation models and the estimation methods during AMT startup are valid.
Highlights
Heavy-duty AMT is a type of transmission with complicated working condition and wider load range
Pettersson et al studied the output torque of the vehicle drive shaft during the shifting process based on the transmission model with elastic drive shaft [4, 5]
AMT test bed consisting of the three-phase induction motor with 55 kilowatts, the efficiency instrument, HW19710 type pneumatic AMT manufactured by China Sinotruck, the inertia plate which is used to simulate the load inertia, the loading device which is used to simulate the load resistance torque, the hydraulic station which is used to provide the hydraulic pressure for the loading device to change the resistance torque conveniently, the air compressor which is used to provide the compressed air for AMT actuator, the AMT measurement and control system which is used to provide the command controls, and the sensors signal collections for communicates between AMT and the computer
Summary
Heavy-duty AMT is a type of transmission with complicated working condition and wider load range. Pettersson et al studied the output torque of the vehicle drive shaft during the shifting process based on the transmission model with elastic drive shaft [4, 5]. Zhang et al studied separate block-based parameter estimation method for Hammerstein systems [9] Belt faults such as breakage and slipping are often caused on account of excessive belt acceleration during the starting process of belt conveyors [10, 11]. Li et al studied the starting process and the shifting process for AMT softly starting the belt conveyor based on known load parameters [16, 17]. The half engagement point of the clutch is a critical point during the starting process which is related to the driving resistance torque on the transmission input shaft. The symbolic meanings are as follows: Tm is the output torque of the three-phase induction motor, Tc is the transmitting torque of the clutch, TconVeyor is the resistance torque at the driving pulley of the belt conveyor, Mg is the friction loss of the transmission, Mr is the friction loss of the reducer, nm is the motor speed, ni is the input speed of the transmission, no and nc are the output speed of the transmission and the driving pulley speed separately
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