THE METHOD OF AN AUTOMATIC TRANSMISSION SHIFTING USING FRICTION CONTROL ELEMENTS, ACCORDING TO A GIVEN LAW OF CHANGING THE ENGINE ANGULAR VELOCITY

The article considers the algorithm of gear change in the automatic transmission (AT) possessing friction control elements and presents the main tasks that can be solved with the help of the algorithm. A strategy has been proposed for controlling the gearshift process which was based on the driver’s desire to change the speed of motion and improve the quality of the gearshifting. The factors significantly affecting the shifting quality were identified and analyzed. The duration the shifting process was chosen as the basic parameter, which was determined by the rules of “fuzzy” logic resulting from the current state of the vehicle and “desire” of the driver. The problem of time optimization for the shifting stages was formulated: torque transmission and synchronization of angular speeds, proceeding from minimization of slipping and the rate of vehicle acceleration change (deceleration) - “jerk”. To solve the optimization problem, the value of “jerk” was limited. The method for constructing the law of the angular velocity change of engine rotation depending on the obtained duration of the shifting stages is given. According to the law of change in the engine angular velocity, it was possible to obtain the laws of the torque variation of the gearbox friction elements during the gearshift. The described algorithm could allow the automatic transmission control system both satisfy the shifting quality requirements, and also adapt the shifting laws during operation. This process was illustrated by the example of an automatic correction of the “control current-torque” characteristic for the included friction control when shifting gears. The basic functional dependencies of the adjustment were given. The example showed the operation of the algorithm over 15 iterations to bring the transient process in accordance with the given law of change.

automatic transmission, gearshift, shifting time, shifting quality, adaptation

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