scholarly journals Research on Shifting Control Method of Positive Independent Mechanical Split Path Transmission for the Starting Gear

2013 ◽  
Vol 2013 ◽  
pp. 1-9
Author(s):  
JunQiang Xi ◽  
JianMin Meng ◽  
HuiYan Chen
Keyword(s):  
Control System ◽  
Control Method ◽  
Control Parameters ◽  
Test Results ◽  
Shaft Speed ◽  
Road Test ◽  
Control Laws ◽  
Shift Quality

To realize a smooth and quick shift of the positive independent mechanical split path transmission (PIMSPT) equipped with automatic shifting control system (ASCS), the research on the feasibility of improving shift quality by dynamic and cooperative controlling engine, steering clutches, and brakes has been conducted. The shifting control method suited to starting gear of PIMSPT has been proposed. The control method is based on control parameters, such as the driving shaft speed and its derivative. The control laws of steering clutches and brakes are presented during each gear and stage of shifting. Bench and road test results show that the proposed shifting control method can not only shorten the shift time, but also decrease the jerk of shifting effectively.

Braking characteristics integrating open working chamber model and hydraulic control system model in a hydrodynamic retarder

2018 ◽  
Vol 233 (6) ◽  
pp. 1952-1971 ◽  
Author(s):  
Hongbin Mu ◽  
Wei Wei ◽  
Lingxing Kong ◽  
Yulong Zhao ◽  
Qingdong Yan
Keyword(s):  
Control System ◽  
System Integration ◽  
Control Method ◽  
Control Parameters ◽  
Hydraulic Control ◽  
Braking Performance ◽  
Working Chamber ◽  
Braking Torque ◽  
Open Working ◽  
Hydraulic Control System

Hydraulic control system has important influence on the steady and transient braking performance of a hydrodynamic retarder. The braking characteristics of hydrodynamic retarder regulated by hydraulic control system should be investigated first, before designing and making the braking strategy and control method. The accurate and detailed braking characteristics models of open working chamber and hydraulic control system are established, integrated, and validated by steady and dynamic experimental data. Based on full factorial design experimental method, the influence of control parameters on braking performance achieving steady state is analyzed with parameter sensitivity, and the effect of control parameters on braking response characteristics is conducted. Then the influence of different tube lengths between working chamber and hydraulic control system on braking performance is discussed and analyzed. The results show the control pressure and rotor rotational speed both have significant impact on braking characteristics with obvious nonlinear, coupling, and interaction effect. The longer response time of hydraulic control system will be for the larger braking torque. Shortening the tube lengths as much as possible is needed to improve the braking torque, cooling flow rate, and system integration.

scholarly journals Dynamic Analysis and Control of the Clutch Filling Process in Clutch-to-Clutch Transmissions

2014 ◽  
Vol 2014 ◽  
pp. 1-14 ◽  
Author(s):  
Wei Guo ◽  
Yanfang Liu ◽  
Jing Zhang ◽  
Xiangyang Xu
Keyword(s):  
Control Method ◽  
Adaptive Method ◽  
Open Loop ◽  
Control Parameters ◽  
Loop Control ◽  
Shift Quality ◽  
Control Precision ◽  
Torque Capacity ◽  
Vehicle Test ◽  
Fuzzy Adaptive

Clutch fill control in clutch-to-clutch transmissions influences shift quality considerably. An oncoming clutch should be applied synchronously with the release of an offgoing clutch to shift gear smoothly; therefore, the gap between the piston and clutch plates should be eliminated when the torque capacity is near zero at the end of the clutch fill phase. Open-loop control is typically implemented for the clutch fill because of the cost of pressure sensor. Low control precision causes underfill or overfill to occur, deteriorating shift quality. In this paper, a mathematical model of an electrohydraulic clutch shift control system is presented. Special dynamic characteristic parameters for optimal clutch fill control are subsequently proposed. An automatic method for predicting initial fill control parameters is proposed to eliminate distinct discrepancies among transmissions caused by manufacturing or assembling errors. To prevent underfill and overfill, a fuzzy adaptive control method is proposed, in which clutch fill control parameters are adjusted self-adaptively and continually. Road vehicle test results proved that applying the fuzzy adaptive method ensures the consistency of shift quality even after the transmission’s status is changed.

Active Vibration Control Method for Space Mechanical Structure with Piezostacks

2013 ◽  
Vol 198 ◽  
pp. 433-438
Author(s):  
Andrzej Piotr Koszewnik
Keyword(s):  
Control System ◽  
Vibration Control ◽  
Control Method ◽  
Active Vibration Control ◽  
Three Dimensional ◽  
Control Laws ◽  
Distributed Parameters ◽  
Short Period ◽  
Lqr Controller ◽  
Active Vibration

Mechanical structures are spatial, three-dimensional (3D) systems of distributed parameters. They present quite complicated plants, if methods of control systems theory are applied. The design process of the vibration control system for such plants is extremely difficult and requires an extensive heuristic knowledge. The subject of the control system is to eliminate the vibrations of the free end at the plane parallel to the foundation Similar problems are met, when the stabilization of robot arms, antennas, satellite solar batteries or slender skyscrapers is considered. In the paper we have presented the 3D bar structure with sticked parallel two piezo-stacks into bars. Recall piezo-elements are actuators, but sensors are two eddy-current sensors located in near free end the structure in perpendicular directions X and Y. Thus the whole structure is TITO (Two Input Two Output) system. For such system the control law was designed with used LQR controller. Above controller was designed for coupled and decoupled system also. In both case a correct damp and very short period of the vibration were criteria to choose the controller parameters. All investigations were carried out in two steps. In the first step control laws were designed in computer simulation. In the second step these control laws were verified experimentally on the laboratory stand by using DSP. Finally, desired control laws were compared.

scholarly journals Method of Cooperative Formation Control for Underactuated USVS Based on Nonlinear Backstepping and Cascade System Theory

2021 ◽  
Vol 28 (1) ◽  
pp. 149-162
Author(s):  
Zaopeng Dong ◽  
Yang Liu ◽  
Hao Wang ◽  
Tao Qin
Keyword(s):  
System Theory ◽  
Control System ◽  
Formation Control ◽  
Control Method ◽  
Tracking Error ◽  
Lyapunov Stability Theory ◽  
State Variables ◽  
State Transformation ◽  
Cascade System ◽  
Control Laws

Abstract This paper presents a method for the cooperative formation control of a group of underactuated USVs. The problem of formation control is first converted to one of stabilisation control of the tracking errors of the follower USVs using system state transformation design. The followers must keep a fixed distance from the leader USV and a specific heading angle in order to maintain a certain type of formation. A global differential homeomorphism transformation is then designed to create a tracking error system for the follower USVs, in order to simplify the description of the control system. This makes the complex formation control system easy to analyse, and allows it to be decomposed into a cascaded system. In addition, several intermediate state variables and virtual control laws are designed based on nonlinear backstepping, and actual control algorithms for the follower USVs to control the surge force and yaw moment are presented. A global system that can ensure uniform asymptotic stability of the USVs’ cooperative formation control is achieved by combining Lyapunov stability theory and cascade system theory. Finally, several simulation experiments are carried out to verify the validity, stability and reliability of our cooperative formation control method.

Sliding Mode Control of Automotive Engines

1993 ◽  
Vol 115 (4) ◽  
pp. 687-693 ◽  
Author(s):  
J. J. Moskwa
Keyword(s):  
Control Method ◽  
Sliding Mode ◽  
Torque Converter ◽  
Front Wheel ◽  
Control Laws ◽  
Loop Control ◽  
Automotive Engine ◽  
Shift Quality ◽  
Engine Model ◽  
Turbine Speed

There is considerable interest in coordinated automotive engine/transmission control for smooth shifts, or for traction control of front wheel drive vehicles. Closed-loop control of the engine has been shown to be useful in improving shift quality. Because of the nonlinear dynamic behavior of the engine, the control method of sliding modes is well suited for engine control algorithms. The authors outline a dynamic engine model, and develop the sliding control laws to follow desired torque converter pump and turbine speed trajectories. The relationships between these desired trajectories and shift quality are also outlined.

A Remote Intelligent Control Method Based on the Thermal Comfort Model

2012 ◽  
Vol 235 ◽  
pp. 216-220
Author(s):  
Jie Min Ding ◽  
Zhen Zhong Li ◽  
Wei Bo Li ◽  
Pin He
Keyword(s):  
Control System ◽  
Thermal Comfort ◽  
Intelligent Control ◽  
Control Method ◽  
Control Device ◽  
Airflow Rate ◽  
Air Conditioner ◽  
Test Results ◽  
Artificial Immune ◽  
Thermal Comfort Model

In order to improve thermal comfort and avoid manually controlled split air conditioner, this paper proposes a remote intelligent control method based on the thermal comfort model. It first carries out an analysis of the thermal comfort model and simplifies objective function of the thermal comfort model, which contains only the temperature, humidity and the airflow rate of 3 parameters. In order to get the data of the three parameters of the environment the paper designs an intelligent control device with sensors and also provides the artificial immune method to optimize these three parameters. The test results show that the three parameters obtained in this paper are feasible and effective for the split air conditioner intelligent control. And this method can also be used for other similar equipment control system.

Minimalistic Control for Reaching Absolute State of a One-Legged Dynamic Robot on Uncertain Terrain

2020 ◽  
Vol 142 (7) ◽  
Author(s):  
Adar Gaathon ◽  
Amir Degani
Keyword(s):  
Path Planning ◽  
Control Method ◽  
Legged Robots ◽  
Basic Block ◽  
Rough Terrain ◽  
Control Parameters ◽  
Legged Robot ◽  
Initial State ◽  
Control Laws ◽  
State Information

Abstract Footstep and path planning for dynamic legged robots is complex, and even if such a plan exists, execution is even harder. We propose a new method for a planar model of a dynamic legged robot that brings the trajectory to an absolute desired destination even on unknown rough terrain with minimal sensing. This can later aid a global planner to reach “way-points” with low destination errors. The basic block of the technique incorporates two consecutive jumps, each triggers a minimalistic control method to govern a sole controller—the leg angle during flight. Only two detection sensors and initial state information are required during implementation. Prior to execution, an optimization process is initiated to obtain the temporal control laws for both jumps. This work presents the process of obtaining the control parameters and studies the performance and limitations of the scheme.

Development of Monitoring and Control System for Laser Remanufacturing

2010 ◽  
Vol 44-47 ◽  
pp. 81-85 ◽  
Author(s):  
Xiao Dong Hu ◽  
Fan Zhi Kong ◽  
Jian Hua Yao
Keyword(s):  
Control System ◽  
Control Method ◽  
Test Results ◽  
Monitoring And Control ◽  
Fuzzy Pid Control ◽  
Monitoring And Control System ◽  
Software Interface ◽  
And Control ◽  
Stable Flow

In order to monitor the process of laser remanufacturing and control the quality of remanufacturing, a monitoring and control system for laser remanufacturing was constructed with its hardware and software. The schedule of the system including signal condition, software interface, sampling and control method, was introduced. Infra-red thermometer with dynamic aiming device was designed to track the molten pool location. Photoelectric sensor was developed to measure the flow of powder. The contrast test results show that the fuzzy PID control system for powder feeding could achieve stable flow.

scholarly journals Study on Oil Pressure Characteristics and Trajectory Tracking Control in Shift Process of Wet-Clutch for Electric Vehicles

2016 ◽  
Vol 2016 ◽  
pp. 1-11 ◽  
Author(s):  
Junqiu Li ◽  
Yihe Wang ◽  
Jianwen Chen ◽  
Zongping He
Keyword(s):  
Control System ◽  
Trajectory Tracking ◽  
Dynamic Models ◽  
Control Method ◽  
Sliding Mode ◽  
Hydraulic Control ◽  
Shift Quality ◽  
Wet Clutch ◽  
Tracking Model ◽  
Hydraulic Control System

Accurate control of oil pressure of wet-clutch is of great importance for improving shift quality. Based on dynamic models of two-gear planetary transmission and hydraulic control system, a trajectory tracking model of oil pressure was built by sliding mode control method. An experiment was designed to verify the validity of hydraulic control system, through which the relationship between duty cycle of on-off valve and oil pressure of clutch was determined. The tracking effect was analyzed by simulation. Results showed that oil pressure could follow well the optimal trajectory and the shift quality was effectively improved.

Review of Course Keeping Control System for Unmanned Surface Vehicle

2015 ◽  
Vol 74 (5) ◽  
Author(s):  
M. N. Azzeri ◽  
F. A. Adnan ◽  
M. Z. Md. Zain
Keyword(s):  
Control System ◽  
Control Method ◽  
Research Work ◽  
Irregular Waves ◽  
Automated Control ◽  
Real Time System ◽  
Unmanned Surface Vehicle ◽  
Control Laws ◽  
Feedback Parameter ◽  
Uncertain Dynamics

This paper presents a review of research work done on various aspects of control system approaches of unmanned surface vehicle (USV) in order to improve the course keeping performance. Various methods have been used to produce a course keeping control system for manoeuvring system of USV. However, the review reveals that the adaptive backstepping control system is a powerful tool for the design of controllers for nonlinear systems or transformable to form a tight feedback parameter. It is very suitable for the automated control system of USV in relative motion that involves the disturbances from waves and wind. Fuzzy logic control also had been suggested as an alternative approach for complex systems with uncertain dynamics and those with nonlinearities. This method does not rely on the mathematical models, but the heuristic approach. Further studies may be conducted to combine the control method approach mentioned above to develop a real time system with robust control laws to the motions of a USV in waves, usually at a specific speed, including station keeping or heading in sinusoidal and irregular waves.  

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