Curve detection shift control method for dual-clutch automatic transmission vehicle

Abstract

The invention provides a road turn detection gear shift control method of a DCT (Double Clutch Transmission) automobile. The road turn detection gear shift control method comprises the following steps that: when a system judges that the DCT automobile starts road turn detection gear shift control, the DCT automobile obtains power through delaying gear shift and in-advanced downshift; and the DCT automobile normally shifts gears according to an MAP picture until the system judges that the DCT automobile enters a straight road system and stops the road turn detection gear shift control. The system can judge an automobile turning turn degree by calculating a wheel speed difference of driving wheels, wherein when the wheel speed difference of the driving wheels is certain, the turn degree is smaller while the vehicle speed is higher, and the turn degree is greater while the vehicle speed is lower; and when the vehicle speed is certain, the turn degree is smaller when the wheel speed difference is smaller, and the turn degree is greater when the wheel speed difference is greater. When the system starts the road turn detection gear shift control to prevent a vehicle from frequently starting and stop the road turn detection gear shift control on an intermittent road turn surface (such as a sky way), the system sets a delay time of starting and stopping the road turn detection gear shift control, so that a driver can supply the enough power to the vehicle when making a turn. Therefore, the conditions of influencing on the driving comfort and the driving stability, caused by insufficient generated power, can be avoided; and the driving security can be ensured simultaneously.

Description

technical field [0001] The invention belongs to the shift control technology of an automobile transmission, and in particular relates to a method for shift control of a double-clutch automatic transmission (DCT) vehicle in a curve. When the driver performs a turning operation on the vehicle, the vehicle adopts a curve detection and shift control method to control the shift schedule. Background technique [0002] The DCT transmission (abbreviation of Double Control Transmission) adds a clutch to the original manual transmission, and at the same time adds TCU control to allow it to automatically shift gears. For five-speed DCT vehicles, the gears are divided into odd gears ( 1st gear, 3rd gear, 5th gear) and even-numbered gears (including reverse gear, 2nd gear, 4th gear) are respectively separated and engaged with clutch 1 and clutch 2 to exchange gears. This structure solves the problem of shift shock in traditional single-clutch automatic transmission (AMT). The shifting ...

AI Technical Summary

Problems solved by technology

During the turning process, the load of the vehicle increases significantly. If the gear is shifted according to the shift map, it will inevitably lead to insufficient power of the vehicle and affect the driving comfort and stability of the vehicle.

Severe situations will cause the vehicle to stall, and the vehicle may reverse when climbing and turning, causing traffic accidents and affecting safety

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