Gear switching method of electronic gear shifter

Abstract

The invention relates to a gear shifting method of an electronic gear shifter, which comprises the following steps of: S1, shifting a P gear into an R/D/N gear or shifting an N gear into the R/D gear: if three conditions of the vehicle speed, braking and the engine rotating speed are met at the same time, completing a gear shifting request, allowing the P gear to be shifted into the R/D/N gear or the N gear to be shifted into the R/D gear, transmitting an instruction to a transmission control unit (TCU) by an SCU, further judging whether the gear shifting condition at the moment is met or not by the TCU, or, locking a knob of the gear shifter to forbid a current gear to be switched into the R/D gear and forbid the current gear to be shifted out of the N/P gear; S2, shifting the current gear into the P gear: directly transmitting a gear shifting request of a driver to the TCU through the SCU, at the moment, judging whether the vehicle speed and braking meet the requirements or not by the TCU, if not, refusing to implement the gear shifting action by the TCU, and if yes, commanding a transmission to be shifted in the P gear by the TCU; and S3, shifting the current gear into the N gear, and directly commanding the transmission to be shifted into the N gear by the TCU. According to the invention, the probability of misoperation of the driver is reduced, and once misoperation occurs, driving dangers are avoided by executing a reliable transmission gear shifting strategy.

Description

technical field [0001] The invention relates to a gear switching method of an electronic gear shifter. 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 identification and execution of gear positions, and misoperation. Traffic accidents caused by the wrong recognition of the gear position of the electronic shifter and the misoperation of the electronic shift lever occur from time to time, ranging from damage to the vehicle to serious casualties. Therefore, it is necessary to design to prevent the driver from mismanipulating the gear during driving and to minimize the probability of car danger in case of misoperation. It is necessary to design a set of shi...

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 wires and brackets Etc., easy to wear and tear, affecting the smoothness of shifting; 3. It cannot meet 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 inside of the transmission 5. The NVH performance is not good, and the NVH on the chassis may be transmitted to the cockpit through the shift wire

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