Optimization of shift control trajectories for step gear automatic transmissions

Čorić, Mirko and Ranogajec, Vanja and Deur, Joško and Ivanović, Vladimir and Tseng, H. Eric (2017) Optimization of shift control trajectories for step gear automatic transmissions. = Optimization of shift control trajectories for step gear automatic transmissions. ASME Journal of Dynamic Systems, Measurement, and Control, 139 (6). ISSN 0022-0434. Vrsta rada: ["eprint_fieldopt_article_type_article" not defined]. Kvartili JCR: Q3 (2017). Točan broj autora: 5.

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New generation of torque converter automatic transmissions (ATs) include a large number of gears for improved fuel economy and performance. Control requirements for such a transmission become more demanding, which calls for the development of new shift control optimization tools. A pseudospectral collocation method is used in the paper to optimize AT clutch and engine control trajectories for comfortable and efficient shifts. Since the optimization method requires a smooth formulation of plant model, the emphasized clutch model nonlinearity around the zero slip speed has been found to be a major difficulty to be resolved through proper modeling of the optimization problem. Therefore, different approaches of describing the friction behavior are considered and assessed, starting from simple static models, through dynamics models, toward torque-source approaches subject to the clutch passivity constraint. Apart from the conventional optimization approach based on minimizing the cost function (including the vehicle jerk and clutch energy loss terms), the so-called feasibility approach based on restricting the cost through an inequality constraint is considered, as well. The proposed optimization method has been verified on a characteristic example of 10-speed AT for both single- and double-transition shifts (DTSs). It has been found out that the clutch passivity constraint- based approach results in numerically most efficient optimizations for a wide range of shift tasks and scenarios.

Item Type: Article (["eprint_fieldopt_article_type_article" not defined])
Keywords (Croatian): torque; friction; optimization; engines
Subjects: TECHNICAL SCIENCE > Civil engineering
Divisions: 900 Department of Robotics and Production System Automation > 910 Chair of Engineering Automation
Indexed in Web of Science: Yes
Indexed in Current Contents: Yes
Citations JCR: 1 (18.10.2018.)
Quartiles: Q3 (2017)
Citations SCOPUS: 0 (18.10.2018.)
Date Deposited: 17 May 2017 12:08
Last Modified: 18 Oct 2018 13:54
URI: http://repozitorij.fsb.hr/id/eprint/7761

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