Development of 2 Stage CVT Shift Control Algorithm to Reduce Torque Variation During 1-2 Upshift of Planetary Gear

2012 ◽  
Author(s):  
Jeongman Park ◽  
Sunghyun Ahn ◽  
Oheun Kwon ◽  
Youngho Jun ◽  
Minhyo Kim ◽  
...  
Keyword(s):  
Control Algorithm ◽  
Planetary Gear ◽  
Gear Ratio ◽  
Shift Quality ◽  
Response Characteristics ◽  
Shift Control ◽  
Variable Transmission ◽  
Vehicle Simulator ◽  
Simulation Results ◽  
Fuzzy Control Algorithm

In this paper, a 2 stage continuously variable transmission (CVT) shift control algorithm is proposed for the 1–2 upshift of the planetary gear to achieve the shift quality. A fuzzy control algorithm is designed considering the relatively slower response characteristics of CVT. In order to evaluate the performance of the control algorithm, a 2 stage CVT vehicle simulator is developed including a dynamic model of the CVT powertrain. From the simulation results, it is found that CVT gear ratio changes faster in the inertia phase and remains constant after the inertia phase of the planetary gear shift, which provides the reduced torque variation by the proposed control algorithm.

scholarly journals Analysis and experiment of HMT stationary shift control considering the effect of oil bulk modulus

2020 ◽  
Vol 12 (11) ◽  
pp. 168781402096832
Author(s):  
Xueliang Li ◽  
Lu Zhang ◽  
Shujun Yang ◽  
Nan Liu
Keyword(s):  
Experimental Study ◽  
Bulk Modulus ◽  
Control Method ◽  
Simulation Analysis ◽  
Continuously Variable Transmission ◽  
Mechanical Transmission ◽  
Reverse Time ◽  
Shift Quality ◽  
Shift Control ◽  
Variable Transmission

In order to improve the shift quality of hydro-mechanical continuously variable transmission, the effect of tangent bulk modulus and different control methods on the shift quality were analyzed. Theoretical analysis and experimental study on the tangent bulk modulus of oil were carried out to obtain the effect law of air content on the tangent bulk modulus of oil. A four-cavity model of a closed hydraulic circuit was established based on a two-stage arithmetic type hydro-mechanical transmission. By means of simulation analysis and experimental study, the effect of the tangent bulk modulus of oil on the shift quality is studied. The lean control method of reasonably controlling displacement ratio and prolonging the reverse time of load torque is put forward. The results show that this method can reduce the fluctuations of the speed of the fixed displacement motor and the oil pressure of the original low-pressure side. This method can also improve the shift quality and provide reference for the study of the shift process of hydro-mechanical continuously variable transmission.

Study on the Wheeled Robot Collision Avoidance Based on Fuzzy Control

2013 ◽  
Vol 694-697 ◽  
pp. 1667-1670
Author(s):  
Su Ying Zhang ◽  
Shao Jie Xu ◽  
Yun Du ◽  
Jing Fei Zhu
Keyword(s):  
Fuzzy Control ◽  
Collision Avoidance ◽  
System Reliability ◽  
Control Algorithm ◽  
Rational Design ◽  
Simple Structure ◽  
Fuzzy Rules ◽  
Wheeled Robot ◽  
Simulation Results ◽  
Fuzzy Control Algorithm

Wheeled robot walk because of its simple structure,continuous advantages of smooth, fast and easy to control, is often used as special robot, but wheeled robot at run time, facing one of the major issues is how to avoid obstacles, increase system reliability. Introduction of fuzzy control algorithm in this article, by rational design of fuzzy rules, plan routes, to achieve effective avoidance, collision of the simulation results show that the fuzzy control can be effective, improves the reliability of robots running.

scholarly journals Research of Variable Application Control System Based on Fuzzy Control

2018 ◽  
Vol 38 ◽  
pp. 01013
Author(s):  
JinXia Huang ◽  
Yu Zhang ◽  
XiaoGuang Su ◽  
SiQing Tian
Keyword(s):  
Control System ◽  
Fuzzy Control ◽  
Automatic Control ◽  
Automatic Control System ◽  
Pesticide Residues ◽  
Control Algorithm ◽  
Unit Area ◽  
Pesticide Application ◽  
Simulation Results ◽  
Fuzzy Control Algorithm

The AT89C52 microcontroller and the fuzzy control algorithm is used to design the automatic control system of variable Spraying pesticides. The system adjusts automatically the electric regulating valve according to given Spraying pesticides per unit area so that the actual amount of Spraying pesticides equal to the set value. The simulation model of automatic control system of variable pesticide application was established, and the controller was simulated by MATLAB / SIMULINK software fuzzy control toolbox. The simulation results show that the structure and algorithm of the proposed automatic control system of pesticide application is feasible, The system improves greatly pesticide utilization, reduce pesticide residues and environmental pollution.

Fuzzy Control for the Obstacle Avoidance of a Quadrotor UAV

2015 ◽  
Vol 775 ◽  
pp. 307-313 ◽  
Author(s):  
Zi Mu Wen ◽  
Shu Dao Zhou ◽  
Min Wang
Keyword(s):  
Fuzzy Control ◽  
Real Time ◽  
Obstacle Avoidance ◽  
Control Algorithm ◽  
Ultrasonic Sensor ◽  
Practical Application ◽  
Ultrasonic Sensors ◽  
Quadrotor Uav ◽  
Simulation Results ◽  
Fuzzy Control Algorithm

To solve the presence of the phantom phenomenon when single ultrasonic sensor detects obstacles, this paper proposes a multi-ultrasonic sensors design using grouping cycle emission. Using the fuzzy control algorithm in the obstacle avoidance simulation, the quadrotorflies through an unknown environment. The simulation results show that the algorithm can meet the requirements of the quadrotor obstacle avoidance , and have the characteristics of real-time and accuracy , provide the foundation for further practical application.

Shift Quality and Optimal Control of an Uninterrupted Shift Transmission Based on Overrunning Mechanism

2011 ◽  
Vol 48-49 ◽  
pp. 1038-1043
Author(s):  
Yan Wei Liu ◽  
Ke Gang Zhao ◽  
Xiang Dong Huang ◽  
Rong Shan Yang
Keyword(s):  
Genetic Algorithm ◽  
Optimal Control ◽  
Control Strategy ◽  
Power Flow ◽  
Control Parameters ◽  
Shift Quality ◽  
Flow Interruption ◽  
Shift Control ◽  
Working Principle ◽  
Simulation Results

Working principle of an uninterrupted shift transmission (UST) based on overrunning mechanism and its driveline dynamic model, as well as shift control strategy are studied. For shift quality optimization, the throttle control parameters are calculated based on simplex method and genetic algorithm. Using the control strategy and optimized parameters, simulation results show that jerks and clutch slip during shift are controlled well, satisfactory shift quality is obtained without power flow interruption.

Study of a Non-Circular Gear Infinitely Variable Transmission

2014 ◽  
Author(s):  
Kumar Hebbale ◽  
Dongxu Li ◽  
Jing Zhou ◽  
Chengwu Duan ◽  
Chi-Kuan Kao ◽  
...  
Keyword(s):  
Static Analysis ◽  
Fuel Efficiency ◽  
Planetary Gear ◽  
Gear Ratio ◽  
Development Effort ◽  
Function Generator ◽  
Multiple Function ◽  
Variable Transmission ◽  
Infinitely Variable Transmission ◽  
Function Generators

Improving automobile fuel efficiency is an important research and development effort in the automotive industry. In the transmission area, it is generally understood that optimum fuel economy can be achieved via a combination of highly efficient power transfer (gears, for example) and an ability to transmit power at an infinite number of ratios (CVT, for example). In this paper, a geared infinitely variable transmission (IVT) is analyzed for efficiency through static analysis. This IVT is based on a non-circular gear concept described in [1, 2]. This IVT consists of multiple function generators with each function generator comprising two sets of non-circular gear sets whose outputs are combined with a summing planetary gear set. Each function generator provides the desired gear ratio for only a part of the driving rotation. So, multiple function generators are combined along with multiple one-way clutches to provide an infinitely variable transmission. This paper first explains the operating principle of the geared IVT. A static analysis of the IVT powerflow is derived and it is shown that this powerflow exhibits a torque recirculation phenomenon, which is not desired. This recirculation phenomenon is expected to be present in all similarly arranged IVTs where two inputs are combined using a planetary gear set to provide infinite gear ratio capability. The efficiency of the IVT is calculated based on assumed individual component efficiency and it is shown that, owing to torque recirculation, the efficiency of this transmission may not compare well with that of current automatic transmissions for a passenger car application.

scholarly journals Analysis of the shift quality of a hydrostatic power split continuously variable cotton picker

2021 ◽  
Vol 12 (1) ◽  
pp. 589-601
Author(s):  
Wanqiang Chen ◽  
Zhaorui Xu ◽  
Yeqi Wu ◽  
Yehui Zhao ◽  
Guangming Wang ◽  
...  
Keyword(s):  
Ride Comfort ◽  
Planetary Gear ◽  
Shift Quality ◽  
Acceleration Rate ◽  
Cotton Picker ◽  
Power Split ◽  
Action Time ◽  
Variable Transmission ◽  
The Cost

Abstract. In order to improve the ride comfort of a continuously variable cotton picker, the shift quality of the cotton picker is analysed. Firstly, the transmission principle of the hydrostatic power split continuously variable transmission (CVT) with a single planetary gear set is introduced; secondly, the shift dynamic model of the power train is constructed, and the key models are verified by experiments; finally, the influence law and mechanism of various factors in the shift qualities of a cotton picker are analysed. The results show that the increase in main circuit pressure will reduce the shift quality of the cotton picker; the influence of clutch-charging flow and acceleration rate on the shift quality of the cotton picker can be ignored; with the action time of the clutch delayed in a certain range, the shift impact first decreases slightly, then increases, and finally decreases; the increase in the cotton box weight can slightly improve the shift quality of the cotton picker but is at the cost of consuming more clutch-sliding energy. If different factors are evaluated together, the value of the main circuit pressure and charging flow should not be too large or too small. At the same time, the action time of a clutch to be disengaged should be delayed, and the action time of a clutch to be engaged should be advanced. The conclusions of this study can provide theoretical support for the controller development of a continuously variable cotton picker.

Driving Intention Based Optimal Shift Control for Automatic Transmission

2014 ◽  
Vol 472 ◽  
pp. 36-43
Author(s):  
Sheng Zhu ◽  
Jun Hua Hu
Keyword(s):  
Automatic Transmission ◽  
Target Function ◽  
Control Unit ◽  
Gear Ratio ◽  
Torque Control ◽  
Shift Quality ◽  
Shift Control ◽  
Optimal Theory ◽  
Fuzzy Logic Method ◽  
Weighted Values

In general, discomfort and slipping loss cannot be avoided during gearshift due to discrete gear ratio. Therefore, improving shift quality has long been concerned in the developing process of automatic transmission. This paper presents the equivalent dynamic model of automatic transmission, based on which optimal theory is then applied to obtain ideal engaging/disengaging torque control. Driving intention is also taken into consideration in the optimal control by deciding the weighted values for slipping loss and jerk items in the target function with fuzzy logic method. The simulation results show a good reflection of driving intention and could be used to decide band/clutch apply pressure in the control unit developing process afterwards.

Research on Integrated Shift Control Strategy for Automatic Transmission

2016 ◽  
Vol 835 ◽  
pp. 687-692 ◽  
Author(s):  
Lin Yue Zhang ◽  
Yao Fu ◽  
Xing Zhong Li
Keyword(s):  
Control Strategy ◽  
Integrated Control ◽  
Automatic Transmission ◽  
Shift Quality ◽  
Shift Control ◽  
Output Torque ◽  
Control Target ◽  
Simulation Results ◽  
Process Engine ◽  
Control Principle

Shift process of automatic transmission is divided into torque phases and inertia phase, and the control principle of clutch to clutch shift is studied with the lever method. Then, inertia phase engine and transmission integrated control principle and entire shift process engine and transmission integrated control principle are respectively studied with taking power on up shift as study example and taking the transmission output torque fluctuations during shifting minimum as control target. Simulation results are compared to the results of power on up shift without engine and transmission integrated control, and it is proved that the transmission output torque overshoot peak with inertia phase engine and transmission integrated control strategy is decreased significantly and shifting jerks are reduced. Shift quality is improved significantly.

Speed regulation control of tractors’ new dual-flow transmission system based on slip rate resistance classification

2021 ◽  
pp. 095440702110105
Author(s):  
Guang Xia ◽  
Yan Xia ◽  
Xiwen Tang ◽  
Linfeng Zhao ◽  
Baoqun Sun
Keyword(s):  
Control Strategy ◽  
Control Algorithm ◽  
Production Efficiency ◽  
Sliding Mode ◽  
Slip Rate ◽  
Speed Control ◽  
Working Environment ◽  
Vehicle Speed ◽  
Speed Change ◽  
Simulation Results

Fluctuations in operation resistance during the operating process lead to reduced efficiency in tractor production. To address this problem, the project team independently developed and designed a new type of hydraulic mechanical continuously variable transmission (HMCVT). Based on introducing the mechanical structure and transmission principle of the HMCVT system, the priority of slip rate control and vehicle speed control is determined by classifying the slip rate. In the process of vehicle speed control, the driving mode of HMCVT system suitable for the current resistance state is determined by classifying the operation resistance. The speed change rule under HMT and HST modes is formulated with the goal of the highest production efficiency, and the displacement ratio adjustment surfaces under HMT and HST modes are determined. A sliding mode control algorithm based on feedforward compensation is proposed to address the problem that the oil pressure fluctuation has influences on the adjustment accuracy of hydraulic pump displacement. The simulation results of Simulink show that this algorithm can not only accurately follow the expected signal changes, but has better tracking stability than traditional PID control algorithm. The HMCVT system and speed control strategy models were built, and simulation results show that the speed control strategy can restrict the slip rate of driving wheels within the allowable range when load or road conditions change. When the tractor speed is lower than the lower limit of the high-efficiency speed range, the speed change law formulated in this paper can improve the tractor speed faster than the traditional rule, and effectively ensure the production efficiency. The research results are of great significance for improving tractor’s adaptability to complex and changeable working environment and promoting agricultural production efficiency.

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