New gear switching strategy for automatic transmission

Abstract

The present invention relates to the technical field of automobiles, in particular to a new gear switching strategy for an automatic transmission. This set of gear shifting system is mainly composed of a knob-type electronic shifter, an SCU (electronic shifter control module), a DCT transmission and a TCU (transmission control module). The signals of all systems are interacted by a CAN bus. The gear shifting strategy is as follows: when a driver puts a vehicle into an R / D gear, and the SCU performs judgment after receiving the gear shifting request from the driver, wherein the judging condition at this time is that if the vehicle speed or brake does not meet the set requirements, the SCU will lock the knob of the shifter and prohibit putting into the R / D gear, thus effectively preventing the shifter end from shifting into the R gear at higher forward speed or shifting into the D gear at higher reverse speed. More intelligent functions can be supported, such as advanced auxiliary driving functions such as automatic parking and adaptive cruise.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a new gear switching strategy of an automatic transmission. Background technique [0002] With the continuous development of new technologies in the automotive industry, more and more low-end automatic transmission models are equipped with electronic shifters. In the process of using the electronic shifter of automatic transmission models, there is a potential danger that many car owners do not pay attention to, that is, the wrong use of gear positions and misoperation. Traffic accidents caused by misoperation of levers occur from time to time, ranging from vehicle damage to serious casualties, so how to prevent the driver from mismanipulating the gear during driving and how to restore the car once misoperation occurs? To minimize the probability of danger, it is necessary to design a set of shift logic strategies that cooperate with the electronic shifter and transmission. ...

AI Technical Summary

Problems solved by technology

However, the traditional mechanical automatic shifter has the following disadvantages: 1. The size and weight are large, and the space requirements for the sub-instrument are relatively high, and the location arrangement is not flexible enough; 2. The mechanical system includes multiple kinematic pairs, such as shift zippers and brackets Etc., easy to wear and tear, affecting the smoothness of shifting; 3. Cannot adapt to the electrification and intelligent requirements of the current automobile industry; 4. In the case of a fault in the reverse gear lock of the shifter, wrongly engaging the reverse gear and the P gear will damage the transmission Internal structure; 5NVH performance is not good, the NVH on the chassis may be transmitted to the cockpit through the shift wire

Images