On the choice of switching gears parameters for automatic transmissions with friction elements
Abstract
Introduction. One of the most important and complex engineering tasks in creating automatic transmissions (AT) is the choice of algorithms and transient parameters when switching gears. When solving this problem, it is necessary to take into account the vehicle operating conditions, its weight state, macro- and microprofile roads, driving style, etc.
The purpose of the study was to carry out computational and experimental studies of the switching process of the passenger vehicle automatic transmission from the lowest to the highest gear and obtain the switching process parameters in order to select the optimal characteristic of changing engine speed when switching.
Scientific novelty and results. The basis for the analysis, optimization and further selection of the engine rotation speed changing characteristic in gear switching was the interrelation of the switching process estimated parameters which has been proved by the calculated and experimental data. A way of selecting the optimal engine speed characteristic at switching gears was proposed which should be used when choosing the control algorithm for friction elements affecting the automatic gearbox stages switching process.
Practical significance. The proposed methodology should be used in the development of switching process algorithms and the choice of its parameters.
About the Authors
I. A. Fisenko
Federal State Unitary Enterprise “Central Scientific Research Automobile and Automotive Engines Institute” (FSUE “NAMI”)
Russian Federation
Russian Federation
PhD (Eng), leading expert of the Expert Council
Moscow 125438
O. I. Girutskiy
Federal State Unitary Enterprise “Central Scientific Research Automobile and Automotive Engines Institute” (FSUE “NAMI”)
Russian Federation
Russian Federation
D.Sc.(Eng), professor, vice-chairman of the Expert Council
Moscow 125438
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Review
For citations:
Fisenko I.A., Girutskiy O.I. On the choice of switching gears parameters for automatic transmissions with friction elements. Trudy NAMI. 2019;(2):6-13. (In Russ.)
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