A start-up control method and system for a wet dual-clutch automatic transmission

Abstract

The invention provides a starting control method and system for a wet-type dual-clutch automatic gearbox. The method comprises the steps of obtaining the engine rotating speed and the transmission shaft rotating speed when a vehicle is located at the starting stage, and according to the engine rotating speed and the transmission shaft rotating speed, judging whether a transmission shaft drags an engine to rotate; if yes, determining that vehicle starting is under the reverse dragging condition, when the vehicle is under the reverse dragging condition, executing engine torsion limiting, controlling the pressure of a clutch to be Kisspoint pressure, and enabling the engine rotating speed to be increased gradually; if not, obtaining the accelerator opening degree, and according to the accelerator opening degree, controlling torque of the engine to be output, and enabling the engine rotating speed to drive the transmission shaft rotating speed to be increased. The using comfort level and safety of the vehicle can be improved.

Description

technical field [0001] The invention relates to the technical field of control of automobile transmissions, in particular to a start control method and system for a wet dual-clutch automatic transmission. Background technique [0002] A typical wet dual-clutch transmission includes two clutches that work independently. When the gears are switched, the transmission adjusts the clutch oil pressure through the electronic hydraulic control system to control the engagement of one of the clutches, and at the same time control the disengagement of the other clutch to achieve power during the shifting process. without interruption. [0003] The current start-up control process of the dual-clutch transmission is: when the vehicle is at rest or at a lower speed, the accelerator is stepped on, the engine torque and speed rise rapidly, and the clutch pressure increases accordingly, driving the shaft to increase synchronously, and finally realizing the synchronous speed of the shaft and ...

AI Technical Summary

Problems solved by technology

[0004] The invention provides a starting control method and system for a wet dual-clutch automatic transmission, which solves the problem that the existing vehicle is prone to shaking when the reverse dragging condition occurs at the starting stage, and can improve the comfort and safety of the vehicle.

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