Research on Intelligent Shift Strategy of Automatic Transmission

2014 ◽  
Vol 988 ◽  
pp. 586-589
Author(s):  
Guo Xin Zhang ◽  
Min Li ◽  
Xia Wei
Keyword(s):  
Decision Problem ◽  
Automatic Transmission ◽  
Control Technology ◽  
Shift Strategy ◽  
Driving Condition

The control technology of automatic transmission is mainly to solve the decision problem of shift strategy, namely according to the factors of intention of the driver, vehicle running state, road conditions and the principle of the optimal vehicle performances, determine the best gear. This paper mainly studies shift strategy under different driver intention, different driving condition of the vehicle, different use of vehicle.

scholarly journals Adaptive Gearshift Strategy Based on Generalized Load Recognition for Automatic Transmission Vehicles

2015 ◽  
Vol 2015 ◽  
pp. 1-12 ◽  
Author(s):  
Yulong Lei ◽  
Ke Liu ◽  
Yuanxia Zhang ◽  
Yao Fu ◽  
Hongbo Liu ◽  
...  
Keyword(s):  
Real Time ◽  
Automatic Transmission ◽  
External Environment ◽  
Load Condition ◽  
Linear Interpolation ◽  
Control Software ◽  
Memory Space ◽  
Time Performance ◽  
Vehicle Load ◽  
Driving Condition

Recognizing various driving conditions in real time and adjusting control strategy accordingly in automatic transmission vehicles are important to improve their adaptability to the external environment. This study defines a generalized load concept which can comprehensively reflect driving condition information. The principle of a gearshift strategy based on generalized load is deduced theoretically, adopting linear interpolation between the shift lines on flat and on the largest gradient road based on recognition results. For the convenience of application, normalization processing is used to transform generalized load results into a normalized form. Compared with the dynamic three-parameter shift schedule, the complex tridimensional curved surface is not needed any more, so it would reduce demands of memory space. And it has a more concise expression and better real-time performance. For the target vehicle, when driving uphill with gradient 11%, the vehicle load is about 280~320 Nm; when driving downhill, the value is around −340~−320 Nm. Road tests show that generalized vehicle load keeps near 0 in zero-load condition after calibration, and an 11% grade can be estimated with less than 1.8% error. This method is convenient and easy to implement in control software and can identify the driving condition information effectively.

Study on High-Speed Switch Shifting Solenoid Current Control Technology for Automatic Transmission

2014 ◽  
Vol 1006-1007 ◽  
pp. 639-642
Author(s):  
Chun Fu Li ◽  
Yan Qin Li
Keyword(s):  
High Frequency ◽  
High Speed ◽  
Automatic Transmission ◽  
Current Control ◽  
Control Technology ◽  
Working Process ◽  
Frequency Signal ◽  
High Frequency Signal ◽  
Long Time ◽  
The Ideal

The purpose of the solenoid current control is to decrease holding current of the solenoid by selecting suitable frequency and duty, to keep the solenoid opening reliably for a long time and reduce power consumption and improve the solenoid close feature. In this paper, the high frequency signal in oil pressure holding process is determined by theoretical analysis and experimental study. The purpose of the study is to determine the ideal current in the working process of the solenoid.

Study on Uninterrupted Shift Transmission Shift Strategy Based on Fuzzy Control

2013 ◽  
Vol 791-793 ◽  
pp. 668-671
Author(s):  
Ke Gang Zhao ◽  
Hao Chang ◽  
Yong Liang Hu ◽  
Wei Hao Yao
Keyword(s):  
Fuzzy Control ◽  
Control Strategy ◽  
Experimental Results ◽  
Control Technology ◽  
Shift Quality ◽  
Shift Control ◽  
Shift Strategy ◽  
Fuzzy Control Strategy

Uninterrupted Shift Transmission (UST) is a novel vehicle transmission and which is introduced as the research object in this paper. It realizes torque uninterrupted shift by controlling dual multimode controlled shifter (MCS) modes and synchronizers. Fuzzy control technology is adopted in shift control strategy in order to improve its shift quality. Experimental results show that the fuzzy control strategy can improve the shift quality of UST effectively.

Study on Shift Schedule of Pure Electric Vehicles Automatic Transmission

2012 ◽  
Vol 591-593 ◽  
pp. 1212-1216 ◽  
Author(s):  
Kang Huang ◽  
Min Liang Yan ◽  
Zhao Wang ◽  
Dan Dan Zhu
Keyword(s):  
Electric Vehicle ◽  
Electric Vehicles ◽  
Design Method ◽  
Automatic Transmission ◽  
Average Speed ◽  
Vehicle Simulation ◽  
Urban Road ◽  
Shift Schedule ◽  
Shift Strategy ◽  
Simulation Results

This paper puts forward a research design method of pure electric vehicle automatic transmission shift schedule based on the urban road conditions in connection with the problems of the low average speed, the high percentage of idle, and frequently shifting in pure electric vehicle. In order to improve the performance of pure electric vehicle automatic transmission and the using efficiency of the motor, this paper formulates a fuzzy shift schedule in the view of the economy. At the same time, this paper supplies a vehicle simulation in the view of economy through a application instance and the MATLAB / SIMULINK / ADVISOR software. The simulation results show that the fuzzy shift strategy can meet the requirements of the economy very well.

An improved smooth shift strategy for clutch mechanism of heavy tractor semi-trailer automatic transmission

2022 ◽  
Vol 121 ◽  
pp. 105040
Author(s):  
Tiancheng Ouyang ◽  
Yucai Lu ◽  
Shuoyu Li ◽  
Rui Yang ◽  
Peihang Xu ◽  
...  
Keyword(s):  
Automatic Transmission ◽  
Shift Strategy ◽  
Clutch Mechanism

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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