Control method for gear pre-selection for dual clutch transmission

Abstract

The invention relates to control methods for dual clutch transmissions, particularly to a control method for gear pre-selection for an uncombined shaft of a dual clutch transmission and aims at providing the method capable of guaranteeing economy and dynamic property requirements of shift points as well as whole drivability and comfort of a whole vehicle. The control method mainly comprises the steps of judging gears to be combined on a target shaft according to the whole acceleration and the current operating gear; calculating time T required for arriving at actual shaft points of pre-selected gears; determining time T1 required for completing combination of the pre-selected gears according to the rotating speed of the target shaft; determining time T2 required for completely finishing the combination of the pre-selected gears by a synchronizer according to the position of the synchronizer; determining a safety time factor T3 according to the T1, adding the T2 and the T3 together, and if the sum is equal to the T, commanding the synchronizer to begin to execute combination of the pre-selected gears.

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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