Automatic Transmission Shift Torque Control Adaptive Method and Automatic Transmission

Abstract

The invention relates to an automatic transmission gearshift torque control self-adaptive method and an automatic transmission. The self-adaptive method of the automatic gearbox shifting torque control is to first detect whether the shifting speed phase is completed, and record the actual time t of the speed phase sp ; Then compare the velocity to the actual time t sp Compared with the preset standard speed, the time range t up -t dwn for comparison; when t sp greater than t up , reduce the preset base torque request value Tq Req (n), the reduced torque request value Tq Req (n+1) is used for the next shift; when t sp less than t dwn , increase the preset base torque request value Tq Req (n), the increased torque request value Tq Req (n+1) is used for the next gear shift; in this way, the time of the shift speed phase can be controlled by reducing or increasing the torque request value of the engine, so as to take into account both the shift quality and the shift time.

Description

technical field

[0001] The invention relates to the technical field of automatic transmissions, in particular to an automatic transmission shift torque control adaptive method and an automatic transmission. Background technique

[0002] A complete upshifting process of an AT automatic transmission can be divided into 3 stages, which are respectively establishing oil pressure, torque phase and speed phase, such as figure 1 Shown: When shifting, the oil pressure of the Offgoing clutch (OG clutch for short) drops to 0, while the oil pressure of the Oncoming clutch (OC clutch for short) builds up from 0 and gradually increases. After the torque phase and the speed phase, the shift is completed. Among them, in the speed phase stage, when the gear is raised from a low gear to a high gear, the speed ratio becomes smaller and the turbine speed decreases. At this time, the engine needs to reduce the torque to cooperate, so as to facilitate the speed change and improve the smoothness ...

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