scholarly journals Shift Quality Analysis of Heavy-Duty Vehicle Automatic Transmission Shift Control Valve

2015 ◽  
Vol 9 (1) ◽  
pp. 333-338 ◽  
Author(s):  
Ma Wenxing ◽  
Zhang Yan ◽  
Wang Ruoyang ◽  
Lu Xiuquan
Keyword(s):  
Automatic Transmission ◽  
Solenoid Valve ◽  
Simulation Software ◽  
Quality Analysis ◽  
Bench Test ◽  
Heavy Duty ◽  
Shift Quality ◽  
Shift Control ◽  
Heavy Duty Vehicle ◽  
Proportional Solenoid Valve

The structural concepts of Switch solenoid valve and proportional solenoid valve were proposed for the hydraulic shift control system of some hydrodynamic mechanical automatic transmissions. Shift oil pressure of stationary combination valve and proportional solenoid valve was modeled, simulated, contrasted and analyzed by dynamic simulation software in order to study the shift quality of heavy-duty vehicle automatic transmission. The results show that proportional solenoid valve is better to control the characteristic of shift oil pressure, reduce shift shock, improve shift quality and comfort than stationary combination valve. The correctness and validity of the model were verified through bench test, which reflected the dynamic characteristics of shift oil pressure of hydrodynamic mechanical automatic transmission. The results can be used to match the performance and predict heavy-duty vehicle shifting process, and to further lay the foundation for the enhancement of shift performance of the system.

Simulation and Analysis on Stationary Combination Valve of Heavy-Duty Vehicle Automatic Transmission

2013 ◽  
Vol 712-715 ◽  
pp. 2183-2187 ◽  
Author(s):  
Yan Zhang ◽  
Wen Xing Ma ◽  
Wen Xu
Keyword(s):  
Automatic Transmission ◽  
Initial Pressure ◽  
Hydraulic Cylinder ◽  
Orifice Diameter ◽  
Outer Diameter ◽  
Spring Stiffness ◽  
Heavy Duty ◽  
Shift Quality ◽  
Buffer Time ◽  
Heavy Duty Vehicle

A mathematical model and dynamic characteristics simulation model were established based on working principle of stationary combination valve in order to study shift quality of heavy-duty vehicle automatic transmission. Various parameters on buffer characteristics influence and outer diameter of the clutch hydraulic cylinder, the spring stiffness and preload influenced on the buffer time, starting pressure and termination pressure were gained with using batch function. The results show that the smaller the orifice diameter, spring stiffness and preload is, the longer the buffer time is, and the curve of buffer characteristic is downward translation. The larger the outer diameter of the clutch hydraulic cylinder, spring stiffness and preload is, the shorter the buffer time is, while the initial pressure and the termination pressure are relatively lower.

scholarly journals Tracking control and robustness study of shifting process

2018 ◽  
Vol 46 (2) ◽  
pp. 99-106
Author(s):  
Xin-xin Zhao ◽  
Chao Guan
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Method ◽  
Tracking Control ◽  
Pid Controller ◽  
Automatic Transmission ◽  
Good Control ◽  
Simulation Software ◽  
Control Effect ◽  
Engine Torque ◽  
Shift Quality

Heavy dump vehicles are usually working with big load changes and bad work environment, thus change the friction performance of transmission clutches, as well as great affect the shift quality seriously, which influence the vehicle performance. Many researchers developed a lot to design a useful automatic transmission control system. Using PID tracking control and Monte Carlo method, the controller based on an dynamic model was set up to analyze the shifting process of automatic transmission and its robustness in this paper．The shift process was divided into four stages, low-gear phase, torque phase, inertia phase and high-gear phase. The model presents the process from the first gear to the second gear when the torque has big change．Since the jerk and the friction work of clutch are both related to the speed of clutch which was easier to control, it was chose as the target to control the oil pressure for satisfying the requirement of shift quality．The simulation software, Maplesim and Simulink, were used to build the vehicle model and shifting controller for simulation under different working conditions, and the maximum jerk was changed from 34 m/s3 to 12 m/s3 after the optimization. In this paper the Monte Carlo has been used to quantize and evaluate the robustness of the closed-loop system for the friction coefficients and output torque of turbine variation leading by the friction feature parameters and throttle angle changed. Monte Carlo method was used to analyze the effectiveness and robustness of PID controller, which proves that it has good control effect when the throttle is ongoing minor fluctuations. When the throttle is full opening, a quadratic optimal controller based on disturbance is designed by the method of multi-objective optimization. When it changes within 20 percent, PID controller was designed under the guidance of tracking thoughts. The results also show that the controller could still obtain better effect when the friction coefficient ranged from -40 % to 40 % as well as engine torque changed from -20 % to 20 %, which indicates the robustness of controller.

Study on Data Acquisition for Heavy Off-Road Vehicle AT Testing

2012 ◽  
Vol 155-156 ◽  
pp. 765-769
Author(s):  
Er Lie Wang ◽  
Hui Yan Chen ◽  
Gang Tao ◽  
Yu Hui Hu
Keyword(s):  
Data Acquisition ◽  
Virtual Instrument ◽  
Automatic Transmission ◽  
Data Acquisition System ◽  
Solenoid Valve ◽  
Acquisition System ◽  
Data Acquisition Card ◽  
Vehicle Test ◽  
Valve Control ◽  
Proportional Solenoid Valve

Based on the analysis of the testing automatic transmission (AT), the AT’s solenoid valve control signals conditioning circuits and revolving speed F/V converter conditioning circuits are designed, and the data acquisition system is designed based on virtual instrument. The system is composed of the PCI-6024E data acquisition card, signal conditioning circuits and computer, and the acquisition procedure is programmed in graphical language LabVIEW. Finally, the data acquisition system has been verified on vehicle test bench which loads ZF-Ecomat 6HP500 AT. Controlling signals of switching solenoid valves, duty cycle signal of proportional solenoid valve, accelerator aperture signal, oil pressure signals and speed signals are collected, it turns out that the data acquisition system has good feasibility.

scholarly journals Mode Shift Control for a Hybrid Heavy-Duty Vehicle with Power-Split Transmission

Energies ◽  
2017 ◽  
Vol 10 (2) ◽  
pp. 177 ◽  
Author(s):  
Kun Huang ◽  
Changle Xiang ◽  
Yue Ma ◽  
Weida Wang ◽  
Reza Langari
Keyword(s):  
Heavy Duty ◽  
Mode Shift ◽  
Shift Control ◽  
Heavy Duty Vehicle ◽  
Power Split

Program Design of On-Line Fault Diagnosis for ASCS of AMT in a Heavy-Duty Vehicle

2011 ◽  
Vol 109 ◽  
pp. 437-440 ◽  
Author(s):  
Hai Ou Liu ◽  
Ai Zeng ◽  
Wei Qun Song
Keyword(s):  
Fault Diagnosis ◽  
Program Design ◽  
Diagnostic Methods ◽  
Bench Test ◽  
Heavy Duty ◽  
Heavy Duty Vehicle ◽  
On Line ◽  
Working Principle ◽  
Fault Diagnostic ◽  
Diagnostic Software

On the basis of discussing the construction and working principle of AMT for a heavy-duty vehicle, the paper analyzed the main causes for different kinds of faults, and presented three fault diagnostic methods. The diagnostic software was programmed and verified feasible through bench test.

Modelling and simulation of a fuzzy controller of automatic transmission of a tracked vehicle in complicated driving conditions

2007 ◽  
Vol 221 (10) ◽  
pp. 1259-1272
Author(s):  
J Yi ◽  
X-L Wang ◽  
Y-J Hu ◽  
C-G Li
Keyword(s):  
Fuzzy Controller ◽  
Automatic Transmission ◽  
Closed Loop System ◽  
Tracked Vehicle ◽  
Shift Quality ◽  
Shift Control ◽  
Shift Strategy ◽  
Cross Country ◽  
Driving Conditions

Based on a human-vehicle-road closed-loop system of vehicle steering parameter, road surface status, and driver manipulating information, the primary principle of fuzzy intelligent shift control of a tracked vehicle is proposed and the simulation model of a drivetrain is established to adapt the automatic transmission to the complex driving conditions of a tracked vehicle. Using the fuzzy control theory, an intelligent fuzzy shift control system composed of a basic fuzzy shift strategy and a fuzzy modification module is developed to improve the dynamic characteristics and cross-country manoeuvrability. The simulation result shows that the fuzzy shift strategy can improve the shift quality of a tracked vehicle under manifold driving conditions and avoid shift cycling effectively, therefore proving that the intelligent fuzzy shift strategies are better.

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