Method of controlling automatic transmission for reducing synchronization shock during upshift in accelerated state

Abstract

A method of controlling an automatic transmission for reducing synchronization shock during an upshift in an accelerated state may include determining a shift progress rate, performing shift progress rate determination of determining whether the determined shift progress rate is higher than a certain value, performing PID control of a release element when the shift progress rate is determined to be higher than the certain value, performing release element-shared torque determination of determining whether a shared torque of the release element is higher than 0, and reflecting the PID control in the release element when the shared torque of the release element is determined to be higher than 0.

Description

[0001] Cross References to Related Applications [0002] This application claims priority from Korean Patent Application No. 10-2014-0107270 filed on Aug. 18, 2014, the entire contents of which are incorporated herein by reference. technical field [0003] Exemplary embodiments of the present invention relate to a control method of an automatic transmission for reducing synchronous shock during an upshift in an acceleration state; A method of controlling an automatic transmission with synchronous shocks that minimizes synchronous shocks during upshifts under acceleration through the torque steps generated at the end of the actual speed change interval. Background technique [0004] In general, shift feel during fuel upshifts (an upshift occurs when the vehicle is accelerated by depressing the accelerator pedal), which frequently occurs in automatic transmissions or such as DCTs, is an important factor affecting marketability. in the multi-stage transmission. [0005] Howev...

AI Technical Summary

Problems solved by technology

In this case, since the control method is not based on the repetitive data of reducing the amount of shared torque and following the target time, the control method may be imperfect or susceptible to interference

These problems can notably be present in the case of poor performance of the operating mechanism in low temperature hydraulic systems or in hybrid systems where the moment of inertia of the transmission input shaft is high

[0009] In addition, a hybrid system with TMED is difficult to obtain a good shift feel, because the response of the operating mechanism is slow when the performance of the operating mechanism is delayed in a specific situation (such as in a low-temperature hydraulic system), so synchronization is not possible. flat

[0010] That is, in the related art, since the speed change interval is controlled only by reducing the torque of the engaging element, there is a limit to the method of reducing the synchronous shock

Images