Control method of dual-clutch automatic transmission from coasting in neutral to driving in gear

Abstract

The invention discloses a method for controlling an automatic double-clutch gearbox from gliding at the neutral gear to drive on gears, and the whole control process includes neutral gear gliding control, on gear driving control, clutch oil pressure control and engine rotating speed control. According to neutral gear gliding control, a first clutch and a second clutch are started when a gear shifting handle is located at the N gear until the oil pressure of the first clutch and the second clutch is zero. According to on gear driving control, the appropriate gear is selected for driving according to the position of the gear shifting handle. According to engine rotating speed control, the appropriate clutch oil pressure is selected according to a target gear, and uninterrupted and smooth power output is ensured. The synchronization time of the rotating speed of driving plates of the clutches and the rotating speed of driven plates of the clutches is shortened due to engine rotating speed control, and prevention of clutch overheat due to too long gliding abrasion time is benefited. In addition, compared with other domestic wet type double clutch control, the method improves whole vehicle driving comfortableness and driving interest and prolongs service life of the clutches.

Description

technical field [0001] The invention relates to the technical field of automobile transmissions, in particular to a control method for a dual-clutch automatic transmission from coasting in neutral to driving in gear. Background technique [0002] A typical wet dual clutch automatic transmission has two clutches, inner and outer. The outer clutch is connected with the outer input shaft and controls odd-numbered gears. The outer clutch is also called the first clutch; the inner clutch is connected with the inner input shaft and controls the even-numbered gears. The inner clutch is also called the second clutch. Electro-hydraulic control is used to drive the solenoid valve to realize the gear change and the alternate work of the clutch, and finally realize the automatic shifting. [0003] At present, the wet dual-clutch automatic transmission does not have a special system control function for the process of sliding from neutral gear to driving in gear. Contents of the inven...

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