Method for eliminating shift impact in unpowered downshift operation, storage medium, and vehicle

Abstract

The invention relates to a method for eliminating shift impact in the unpowered downshift operation, a storage medium, and a vehicle. The method comprises the steps that whether a command for performing the unpowered downshift operation exists or not is detected, wherein the unpowered downshift operation corresponds to a state that the vehicle is in sliding and current vehicle speed reaches presetvehicle speed; when it is detected that the command exists, rotation speed of an engine is compared with rotation speed of a turbine of an automatic gearbox, and if the rotation speed of the engine is not less than the rotation speed of the turbine, torque of the engine is increased, the rotation speed of a target gear is reached by pulling the turbine of the automatic gearbox to speed up, and the torque of the engine is reduced so that a clutch to be engaged with the target gear can be pressurized before the unpowered downshift operation is finished; and if the rotation speed of the engine is smaller than that of the turbine, the current state of the engine is kept, the clutch is gradually pressurized, the rotation speed of the target gear is reached by pulling the turbine of the automatic gearbox to speed up, and the clutch speeds up pressurizing when the rotation speed of the target gear is achieved.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a method, a storage medium and a vehicle for eliminating the shock of shifting during non-power downshifting operations. Background technique [0002] Nowadays, vehicles have become an indispensable part of people's daily life. With the increasing popularity and quantity of vehicles, people have higher and higher requirements for vehicles. During the driving process of the vehicle, people tend to pay more attention to the comfort of the vehicle, which is often referred to as the vibration and noise characteristics (NVH). At the same time, for gear shifting during vehicle driving, users will require smooth gear shifting. [0003] In order to ensure the NVH characteristics of the vehicle, sometimes it is unavoidable to increase the engine idle speed. When the engine idle speed increases, the engine speed will also increase as a whole during the coasting process of the vehicl...

AI Technical Summary

Problems solved by technology

like figure 1 As shown, the distance or angle that the gear teeth move from forward meshing to reverse meshing is called backlash, because the backlash state may reverse during the operation of the vehicle (for example, from positive backlash to is the reverse backlash), so the gear teeth will collide during this reverse rotation, which causes the problem of shift shock when the vehicle is running

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