A gear control method and device

Abstract

The invention provides a gear control method and device. The gear control method includes the steps that under the condition of determining a first target position and a second target position of a driven disc of a clutch in a static starting shifting stage, the driven disc is controlled to move between the first target position and the second target position in the static starting shifting stage,then, the rotation speed of an input shaft of a speed changer connected with the clutch is kept within a preset rotation speed range, and when the rotation speed of the input shaft of the speed changer is kept within the preset rotation speed range, the gear is controlled to be switched to a starting gear of the static starting shifting stage; when the gear is controlled to be switched, the inputshaft of the speed changer reaches a certain rotation speed, the speed difference between the rotation speed of the input shaft and a target rotation speed is reduced, therefore, the gear can be controlled to be switched successfully in one time, relative to repeated switching, the number of shocked times of the speed changer is reduced, and the service life of the speed changer can be prolonged;the speed difference between the rotation speed of the input shaft and the target rotation speed is reduced, so that shock is reduced, then vehicle waggling is reduced, and therefore the vehicle performance is improved.

Description

technical field [0001] The invention belongs to the field of vehicles, and more specifically relates to a gear control method and device. Background technique [0002] At present, the speed of the transmission input shaft is basically zero during the static start of the vehicle, so that there is a large speed difference between the speed of the transmission input shaft and the target speed, and the success of the gear shift mainly depends on [0003] The speed difference between the speed of the input shaft of the transmission and the target speed is small, so the probability of failure to engage the gear will increase due to the large speed difference between the speed of the input shaft and the target speed during static start. In the process of static start and gear shifting, it may take several shifts to succeed, and each shift will have a greater impact on the vehicle due to the large speed difference between the speed of the input shaft and the target speed, thus affec...

AI Technical Summary

Problems solved by technology

[0003] The speed difference between the speed of the input shaft of the transmission and the target speed is small, so the probability of failure to engage the gear will increase due to the large speed difference between the speed of the input shaft and the target speed during static start. In the process of static start and gear shifting, it may take several shifts to succeed, and each shift will have a greater impact on the vehicle due to the large speed difference between the speed of the input shaft and the target speed, thus affecting the performance and performance of the vehicle. service life

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