Motion Characteristics of a Clutch Actuator for Heavy-Duty Vehicles with Automated Mechanical Transmission

Clutch control has a great effect on the starting quality and shifting quality of heavy-duty vehicles with automated mechanical transmission (AMT). The motion characteristics of a clutch actuator for heavy-duty vehicles with AMT are studied in this paper to investigate the clutch control strategy further. The modeling principle of the automatic clutch system is analyzed, and a simulation analysis is given to prove its validity and rationality. Normalized velocity and velocity modulation percentage are proposed as evaluation parameters for the clutch actuator driven by pulse width modulation (PWM) signals. Based on an AMT test bench, the actuator motion characteristics are analyzed. Experimental results show that the range of normalized velocity and velocity modulation percentage are obtained for the clutch engagement and disengagement processes. By analyzing the experimental data, the engaging velocity and disengaging velocity of the actuator are estimated using the solenoid valves in combination. The research results provide a fundamental basis for precise controlling of the clutch and improving the smoothness of heave-duty vehicles.

Download Full-text

Parameter Estimation of a Countershaft Brake for Heavy-Duty Vehicles with Automated Mechanical Transmission

Processes ◽

10.3390/pr9061036 ◽

2021 ◽

Vol 9 (6) ◽

pp. 1036

Author(s):

Yunxia Li ◽

Lei Li

Keyword(s):

Parameter Identification ◽

Least Squares ◽

Dynamic Model ◽

Control Flow ◽

Mechanical Transmission ◽

Equivalent Resistance ◽

Heavy Duty ◽

Characteristic Parameters ◽

Resistance Torque ◽

Heavy Duty Vehicles

A countershaft brake is used as a transmission brake (TB) to realize synchronous shifting by reducing the automated mechanical transmission (AMT) input shaft’s speed rapidly. This process is performed to reduce shifting time and improve shifting quality for heavy-duty vehicles equipped with AMT without synchronizer. To improve controlled synchronous shifting, the AMT input shaft’s equivalent resistance torque and the TB’s characteristic parameters are studied. An AMT dynamic model under neutral gear position is analyzed during the synchronous control interval. A dynamic model of the countershaft brake is discussed, and its control flow is given. The parameter identification method of the AMT input shaft’s equivalent resistance torque is given on the basis of the least squares algorithm. The parameter identification of the TB’s characteristic parameters is proposed on the basis of the recursive least squares method (RLSM). Experimental results show that the recursive estimations of the TB’s characteristic parameters under different duty cycles of the TB solenoid valve, including brake torque estimation, estimation accuracy, and braking intensity estimation, can be effectively estimated. The research provides some reliable evidence to further study the synchronous shifting control schedule for heavy-duty vehicles with AMT.

Download Full-text

Study on Electro-Pneumatic Clutch for Automatic Mechanical Transmission

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.148-149.1149 ◽

2011 ◽

Vol 148-149 ◽

pp. 1149-1153

Author(s):

Wu Chao Zhang ◽

Yong Zhai

Keyword(s):

Diesel Engine ◽

Field Experiment ◽

Control Strategy ◽

Engine Speed ◽

Mechanical Transmission ◽

Control Law ◽

Clutch Engagement ◽

Automotive Powertrain ◽

System Requirements ◽

Clutch Control

The clutch control is one of the cores and most difficult issues in the development of an AMT system. In this paper the pneumatic clutch engagement characteristic is analyzed. Thereto, a simulation model of an automotive powertrain comprises a diesel engine, drivetrain and wheels driving a vehicle through tire-road adhesion are built using Matlab/Simulink. In the simulation, a refined control law of constant engine speed in part process is proposed and tested. The engaging speed and displacement of the clutch vary with the accelerate paddle opening, engine speed, clutch driven plate speed and gears according the control law. Field experiment results show that the control strategy fulfills the system requirements.

Download Full-text

Optimal Fuzzy Control of Automated Mechanical Transmission Clutch Engagement during Start-Up Process

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.694-697.2089 ◽

2013 ◽

Vol 694-697 ◽

pp. 2089-2093 ◽

Cited By ~ 2

Author(s):

Han Yu Jin ◽

Xiu Sheng Cheng ◽

Yong Dao Song

Keyword(s):

Control Strategy ◽

Control Unit ◽

Mechanical Transmission ◽

Subtle Change ◽

Start Up ◽

Clutch Engagement ◽

Driver’S Intention ◽

Starting Process ◽

Clutch Control ◽

The Impact

Engagement control of the clutch in the starting process is the core part and difficulty of the Automated Mechanical Transmission (AMT) control strategy, which was directly related to the clutch disc lifetime and riding. Engine speed, clutch speed and throttle angle are the only signals to develop clutch control strategy in the entire start-up process made by Transmission Control Unit (TCU) in a vehicle equip with AMT. The TCU even need to determine the driver's intention to select different control schemes. In this paper, fuzzy logic control was adopted in order to eliminate the impact of subtle change during driver operation, thus the start quality was optimized.

Download Full-text

Optimization and Simulation Analysis of Electro Hydraulic Control System of Clutch Engagement Pressure

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.945-949.1579 ◽

2014 ◽

Vol 945-949 ◽

pp. 1579-1582

Author(s):

Han Yu Jin ◽

Xiu Sheng Cheng ◽

Xiu Feng Song

Keyword(s):

Control System ◽

Ride Comfort ◽

Simulation Analysis ◽

Control System Design ◽

Hydraulic Control ◽

Powertrain System ◽

Clutch Engagement ◽

Optimization And Simulation ◽

Clutch Control ◽

Hydraulic Control System

As an important section in powertrain system, the clutch control strategy directly impacted vehicle ride comfort. In this paper, the design scheme of electro hydraulic control system was composed and simulation analysis was conducted by AMESim software. The system parameters were optimized according to genetic algorithm. Series progress of control system design, analyzation and optimization were completely demonstrated.

Download Full-text