Papers by Author: Jian Jun Hao

Abstract: Transmission efficiency of the actuator is an important aspect affecting the performance of AMT. We design a test bench for transmission efficiency of AMT actuator, witch can be adapted to a wide variety of mechanism. We can get a conclusion that this developed test bench can meet the needs of studying transmission efficiency of AMT actuator and other worm gear transmission.

Abstract: Aiming at the problem of long time power interruption and clutch master-slave friction plates wore seriously which greatly shorten the life of clutch during shifting process of AMT, a overrunning AMT without separation process of clutch when shifting is designed. This paper has analyzed structural characteristics and shift principle of overrunning AMT. Through force analysis on the jointing process of roller overrunning clutch, the mathematical model and dynamic model of transmission system are established. Finally, the shifting impact of shifting process is analyzed based on computer simulation. The simulation results indicate that vehicle longitudinal degree of jerk meets the requirement of vehicle comfort.

Abstract: Aiming at relieving processing of annular hob, a applicable method—circumferential relieving method is proposed, this paper describes the principle of relieving processing and implementation method, also proposes a method of computer control, the device which could be mounted on the worktable of hobbing machine to realize circumferential relieving The results showed that method and device proposed in the paper are practicable.

Abstract: We propose a new control scheme based on analyzing the problems existed in the original machine tool. We use single chip Microcomputer as controller, stepper motor to drive machine table, and power monitor for grinding contact detecting. The principle of grinding contact detection was elaborated, the structure of computer hardware and software are presented. The developed control system has been used for machine. The results show that the control system runs properly and achieves the desired effect.

Abstract: We propose a new method aiming at solving the volume measurement problem of the complex-shaped cavity of a workpiece. We first use machine vision technology to obtain the external geometric parameters, and then calculate the external volume of the workpiece through integral principle. Next, we calculate the solid-part volume of the workpiece by dividing its weight by its specific gravity. Finally, by subtracting the solid-part volume from the external volume of the workpiece, we obtain the volume of the inner cavity. The experimental results show that the precision of our method is higher than 0.5%, and the time consumed is less than 20 seconds.

Abstract: Electromechanical control CVT (EM-CVT) is a new type of continuously variable transmission, and its ratio quality is an important parameter validated the performance of vehicle. In order to study the dynamical coupling technology between EM-CVT and engine under the running state of vehicle, the special character of two working models is obtained by engine experiment; according to the principle of the EM-CVT, the relation between vehicle speed and ration is theoretically analyzed. Based on the basic theory of PID control, the improved PID control algorithm is proposed for the speed ratio control of the EM-CVT, and experimental verification is made. The experimental results show that there is a significant effect on the system with this algorithm.

Abstract: Aim to conquer the low efficiency of the current auto-CVT actuated by hydraulic system, a new design was proposed based on the analysis of the energy loss, which used compounded disc spring clamp set and motorized actuation system. Through the special design of the compounded disc spring and the balance spring, the axial thrust was well counterpoised, thus it achieved the result that the actuation system could be droved by low power motor. The test results show that the CVT developed according to the new design can reduce the power consumption obviously and improve the power performance.

Abstract: The efficiency of continuously variable transmission for vehicle is an important factor impacting on its performance, many kinds of power loss in process of shifting down and up are analyzed by means of theoretical and experimental ways, it can be seen that the power loss between metal-belt and pulley, which includes three items of loss: the entering and out of pulley; the slip between elements and surface of pulley; the slip of between steel bands and elements, is a major one. The calculating formulas are founded. The comparison of calculating results with experimental results under the different ratio, it is good coherence between them which has a guiding function for the design of TCU.

Abstract: Based on development project of electro-mechanical control type continuously variable transmission, this paper has done the following works: First of all, the structure and working principle of EM-CVT is studied; then, mathematical model was established; finally, via numerical simulation, Performance Parameters of transmission system, such as mechanical characteristics, dynamic performance of execution system are mastered in the transmission process of EM-CVT. Analysis of the study will contribute to the development of high-quality and highly efficient controller for EM-CVT.