Control method for gear preselection of dual clutch transmission

Abstract

The invention relates to a control method for gear preselection of a dual clutch transmission and a control method for the dual cultch transmission, in particular to a control method used for gear preselection performed on an unengaged shaft of the dual clutch transmission. The control method aims at guaranteeing economical and dynamic requirements of shift points and drivability and comfortableness of the whole vehicle. The control method mainly includes steps: judging a gear needing to be engaged on a target shaft according to the acceleration of the whole vehicle and a currently running gear; calculating the time T needed for reaching an actual shift point of a preselected gear; determining the time T1 needed for completing engagement of the preselected gear according to the rotating speed of the target shaft; determining the time T2 needed for a synchronizer to totally complete engagement of the preselected gear according to positions of the synchronizer; determining a safe time factor T3 according to T1; and adding T2 and T3, and if the sum is equal to T, ordering the synchronizer to start to execute engagement of the preselected gear.

Description

technical field [0001] The present invention relates to a control method of a dual-clutch transmission, in particular to a control method for performing gear position preselection on an uncoupled shaft for a dual-clutch transmission. Background technique [0002] The transmission is a very important part of the modern transmission system. In order to improve the efficiency of the transmission system, a lot of research and development work has been carried out recently. With the development of modern control technology, a considerable part of the development work revolves around dual-clutch transmissions. The gears of the dual clutch transmission are similar to those of a normal manual transmission. The gears in each gear set are arranged on their own shafts and can rotate freely around the shafts. There is a synchronizer next to the gears. The synchronizer can selectively mesh with gears of different gears. Dual clutch transmission. For automatic shifting, the shifting of ...

AI Technical Summary

Problems solved by technology

However, the shifting time of the synchronizer is not necessarily the same. When the shifting is smooth, the combining time of each gear is different. In the future, if the shift point is also compensated for the synchronizer shift time, it will lead to inconsistencies in the shift point and damage the overall vehicle performance such as economy and power.

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