Improving the Quality of Transmission Shifting Transients Due to Controlling Torque Redistribution
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It is known that low-frequency torsion oscillations in the transmission, corresponding to the first one-node Eigen mode, are observed in the transient processes of starting from standstill and gear shifting. The power of these oscillations is sufficient to excite the longitudinal oscillations of the vehicle body (up to 2 ... 4 m/s2). Therefore, the problem of the scientific substantiation and development of new algorithms for controlling transient processes in the powertrain unit of the vehicle after locking friction elements of the shifted gear is actual.
In the research the dynamic processes in powertrain of the vehicle are investigated numerically and experimentally. The development of the algorithm is based on the implementation of power redistribution of the control input. The control function is developed for a specific dynamic state of the system in accordance with the engaged gear and scheme of the driving axes switching (rear/forward/all).
As a result of numerical simulation of the dynamic process, it was found that effectiveness of the proposed control system algorithm is determined by a complex of the transient process parameters - overshoot, response rate and robustness. In this case, Zero vibration derivative (ZVD) algorithm provides the highest efficiency in overshoot with acceptable response rate and robustness. From response rate point of Zero vibration (ZV) algorithm is the best solution. When the frequency of single-node Eigen mode is equal 4 Hz or above it is sensible to use the Ramp algorithm.
Application of suggested algorithms of power control redistribution considering modal properties of the system allows to decrease dynamic loads in the powertrain and to increase comfortableness of the vehicle.
KeywordsVehicle Gear shift Oscillations Transmission Dynamics Shaper filter
This study was funded by the program of the President of the Russian Federation for the support of young scientists—Grant MK-5809.2018.8, and also with partial support under the state task of the Institute of Engineering Science of the Russian Academy of Science (Ural Branch) No. 0391-2019-0001.
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