Optimization of shifting strategy for a dual clutch transmission through mathematical model

European Union legislation sets mandatory emission and fuel consumption reduction targets for new vehicles and therefore economy remains a key challenge for automotive engineers. Optimizing the transmission shift schedule for an automatic transmission with double clutch is an important part of improving fuel economy. Using simulation and optimization algorithms can ensure that a truly optimal shift schedule is implemented. The main objective of this paper focuses on study the performance of a vehicle with a dual clutch transmission (DCT), with special emphasis on optimizing the shifting schedule using optimization algorithms. In order to study and simulate the shifting strategy the dynamic model is developed based on an existing model in MATLAB Simulink software. In the first phase of the paper a detailed description of the DCT technology, its main functional components and dynamic characteristics are explored. In the second phase model development and simulation concerns the major part of this work, to find the optimal shift schedule for different engine speed and engine torque as it accelerates through the transmission gears by engaging the dual clutches. Finally, the simulation results were evaluated and presented which successfully demonstrate the performance improvement of a dual clutch transmission with an optimized shifting strategy.

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Study on Shift Schedule of Automatic Transmission Based on Road Environment and Driving Intentions

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.538-541.758 ◽

2012 ◽

Vol 538-541 ◽

pp. 758-761

Author(s):

Yong Dao Song ◽

Xiu Sheng Cheng ◽

Xi Liu ◽

Peng Han

Keyword(s):

Vehicle Dynamics ◽

Automatic Transmission ◽

Dynamic Parameters ◽

Vehicle Dynamic ◽

Dual Clutch Transmission ◽

Shift Schedule

Traditional shift schedule of automatic transmission cannot meet driving requirements when vehicle is running under conditions of complex road and special driving intentions. On the basis of the analysis of vehicle dynamics, recognition methods of road environment and driving intentions were proposed according to the changes of vehicle dynamic parameters. Traditional shift schedule was rectified and simulation was carried out in vehicle equiped with dual clutch transmission. The results shown that the rectified shift schedule can meet driving requirements. This study can provide an effective shift schedule for automatic transmission.

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Objective Rating of the Launch Behavior of Conventional, Hybrid and Electric Vehicles

Automotive Innovation ◽

10.1007/s42154-020-00131-z ◽

2021 ◽

Author(s):

Christian Dorsch ◽

Xiao Wang ◽

Ferit Küçükay

Keyword(s):

Electric Vehicle ◽

Electric Vehicles ◽

Hybrid Electric Vehicle ◽

Automatic Transmission ◽

Major Influence ◽

Important Process ◽

Dual Clutch Transmission ◽

Conventional Vehicle ◽

Objective Rating ◽

Dynamic Quality

AbstractThe calibration of conventional, hybrid and electric drivetrains is an important process during the development phase of any vehicle. Therefore, to optimize the comfort and dynamic behavior (known as driveability), many test drives are performed by experienced drivers during different driving maneuvers, e.g., launch, re-launch or gear shift. However, the process can be kept more consistent and independent of human-based deviations by using objective ratings. This study first introduces an objective rating system developed for the launch behavior of conventional vehicles with automatic transmission, dual-clutch transmission, and alternative drivetrains. Then, the launch behavior, namely comfort and dynamic quality, is compared between two conventional vehicles, a plug-in hybrid electric vehicle and a battery electric vehicle. Results show the benefits of pure electric drivetrains due to the lack of launch and shifting elements, as well as the usage of a highly dynamic electric motor. While the plug-in hybrid achieves a 10% higher overall rating compared to the baseline conventional vehicle, the pure electric vehicle even achieves a 21% higher overall rating. The results also highlight the optimization potential of battery electric vehicles regarding their comfort and dynamic characteristics. The transitions and the gradient of the acceleration build-up have a major influence on the launch quality.

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Tracking control and robustness study of shifting process

Archives of Transport ◽

10.5604/01.3001.0012.2111 ◽

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.

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PENGEMBANGAN MODEL PENILAIAN PENDIDIKAN KARAKTER ANAK USIA DINI

JPUD - Jurnal Pendidikan Usia Dini ◽

10.21009/jpud.122.17 ◽

2018 ◽

Vol 12 (2) ◽

pp. 361-370

Author(s):

Veny Iswantiningtyas ◽

Widi Wulansari

Keyword(s):

Early Childhood ◽

Character Education ◽

Model Development ◽

Field Tests ◽

Kindergarten Child ◽

Assessment Model ◽

Second Phase ◽

Main Field ◽

Initial Product ◽

Education Assessment

This research aims to develop an early childhood character education assessment model. The research method used is the R & D model developed by Borg & Gall. The implementation of this model development was carried out in 6 stages, namely information gathering, planning, model development, initial product testing, product revision, and main field test. The instrument had developed by the procedure and criteria for item validity and instrument reliability. The first phase of the trial was conducted in Taman Indria Kindergarten, Pare District. The second phase of the trial was conducted at Tauladan Kindergarten and Dharma Wanita Pelem Kindergarten in Pare District. Data from the trial and main field tests were analyzed using factor analysis. The results of this study are as follows: 1) there are 18 character values with 65 indicators indicating that all indicators contribute effectively to the factors in each character value variable, 2) almost all indicators in each character value are strongly and significantly correlated with other indicators so that the assessment model that has been developed can assess all values of character education that have been taught for one semester, 3) according to the results of the questionnaire that has been analyzed it can be concluded that the use of early childhood character education assessment models is very effective to be applied in Kindergarten child. Keywords: Assessment model Development, Character Education Assessment Model, Early Childhood Penelitian ini bertujuan untuk mengembangkan model penilaian pendidikan karakter anak usia dini. Metode penelitian yang digunakan adalah model R&D yang dikembangkan oleh Borg & Gall. Pelaksanaan pengembangan model ini dilakukan dalam 6 tahapan, yaitupengumpulan informasi, perencanaan, pengembangan model, uji produk awal, revisi produk, dan uji lapangan utama.Instrumen yang digunakan telah memenuhi syarat sebagai instrumen yang valid dan reliabel.Uji coba tahap pertama dilakukan di TK Taman Indria Kecamatan Pare. Uji coba tahap kedua dilakukan di TK Tauladan dan TK Dharma Wanita Pelem Kecamatan Pare. Data hasil uji coba dan uji lapangan utama dianalisis menggunakan analisis faktor. Hasil penelitian ini adalah sebagai berikut: 1) terdapat 18 nilai karakter dengan 65 indikator yang menunjukkan bahwa seluruh indikator memberikan sumbangan yang efektif terhadap faktor dalam variabel tiap-tiap nilai karakter, 2) hampir semua indikator pada tiap-tiap nilai karakter berkorelasi kuat dan signifikan dengan indikator yang lain sehingga model penilaian yang telah dikembangkan dapat menilai seluruh nilai pendidikan karakter yang telah diajarkan selama satu semester,3) sesuai hasil angket yang telah dianalisis dapat disimpulkan bahwa penggunaan model penilaian pendidikan karakter anak usia dini sangat efektif untuk diterapkan di Taman Kanak-kanak. Kata Kunci :Pengembangan model penilaian, Model Penilaian Pendidikan Karakter, Anak Usia Dini.

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