Gear switching control method, device and automatic transmission control unit

Abstract

The invention provides a gear-shifting control method and device and an automatic gearbox control unit. The gear-shifting control method comprises the steps that a gear-shifting command is received; a corresponding pre-stored gear-selecting and gear-shifting position reference point is obtained according to the gear-shifting command; gear-shifting control is conducted based on the gear-selecting and gear-shifting position reference point; if gear shifting fails, a corresponding pre-stored gear-selecting and gear-shifting driving time reference value is obtained according to the gear-shifting command; and gear-shifting control is conducted based on the gear-selecting and gear-shifting driving time reference value. According to the gear-shifting control method and device and the automatic gearbox control unit, under the condition that gear-shifting control based on the gear-selecting and gear-shifting position reference point fails, gear-shifting control is conducted based on the gear-selecting and gear-shifting driving time reference value, so that the phenomenon of unsmooth gear shifting caused by abrasion of the gearbox or interference to a position sensor or failures is avoided, and rapid and accurate gear shifting is achieved accordingly.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a gear switching control method, device and automatic transmission control unit. Background technique [0002] As an important part of the car, the gearbox is mainly used for the gear switching of the car. One of the commonly used transmissions at present is an Automated Mechanical Transmission (AMT) transmission. [0003] In the prior art, the process of shifting gears in an AMT gearbox is as follows: Before shifting gears, the automatic transmission control unit (Transmission Control Unit, referred to as TCU) performs self-study of the limit positions of shifting in advance to determine the shifting position of each shifting position. The reference point of the gear position and the corresponding range of selected gear shift positions. When the gear is switched, that is, when the gear is shifted, the TCU drives the solenoid valve to push the gear selection shaft (that is,...

AI Technical Summary

Problems solved by technology

[0004] But the existing technology has at least the following defects: the long-term use of the gearbox will inevitably cause certain wear and tear, resulting in a change in the range of shift positions. Enables fast and accurate shifting

In addition, when the position sensor is disturbed or fails, if you continue to use the original selection and shift position range, the phenomenon of shift sticking will also occur, so that fast and accurate shifting cannot be achieved.

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