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

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.

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The development of dynamic model and power assist control logic of hybrid EPS for heavy-duty vehicles

Advances in Automobile Engineering ◽

10.4172/2167-7670.c1.003 ◽

2015 ◽

Vol 04 (01) ◽

Author(s):

Ji In Park

Keyword(s):

Dynamic Model ◽

Heavy Duty ◽

Control Logic ◽

Heavy Duty Vehicles

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Elimination of Gear Clearance for the Rotary Table of Ultra Heavy Duty Vertical Milling Lathe Based on Dual Servo Motor Driving System

Applied Sciences ◽

10.3390/app10114050 ◽

2020 ◽

Vol 10 (11) ◽

pp. 4050

Author(s):

Hui Jiang ◽

Hongya Fu ◽

Zhenyu Han ◽

Hongyu Jin

Keyword(s):

Dynamic Model ◽

Experimental Result ◽

Mechanical Transmission ◽

Rotary Table ◽

Servo Motor ◽

Heavy Duty ◽

Driving System ◽

Model And Simulation ◽

Vertical Milling ◽

Transmission Structure

The effective way to improve the position accuracy of rotary table of ultra-heavy vertical milling lathe is to reduce or even eliminate the clearance of mechanical transmission structure. In this paper, a useful method for eliminating the gear clearance of C axis of heavy duty machine tool is proposed based on dual servo motor driving system. The principle of double gear anti-backlash is explained and the process of clearance elimination is determined by adjusting the driving torques of the two motors. The dynamic model of the driving system of the dual servo motor is established, so as to find the non-linearity of the clearance, wear and tooth clearance in the drive system. According to the dynamic model and simulation results, the master-slave control parameters of the dual servo motor system are optimized in order to eliminate the clearance and improve the accuracy of the dual drive C-axis. Experiments are carried out to verify the validity of the proposed anti-backlash method. The experimental result also shows that the indexing accuracy of the table has been improved by more than 50% under different working conditions.

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

Actuators ◽

10.3390/act10080179 ◽

2021 ◽

Vol 10 (8) ◽

pp. 179

Author(s):

Yunxia Li ◽

Zengcai Wang

Keyword(s):

Pulse Width Modulation ◽

Simulation Analysis ◽

Mechanical Transmission ◽

Heavy Duty ◽

Velocity Modulation ◽

Clutch Engagement ◽

Motion Characteristics ◽

Clutch Control ◽

Engagement And Disengagement ◽

Heavy Duty Vehicles

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.

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