Torque differential two-speed automatic transmission and shift control method

Abstract

The invention discloses a torque return difference type two-gear automatic transmission and a gear shifting control method, and belongs to the field of transmissions and control technologies thereof. The transmission comprises a first gear serving as a low gear and a second gear serving as a high gear. A transmission input shaft is fixedly connected with a first-gear driving gear and a second-gear driving gear, and an overrun clutch is installed between a first-gear driven gear and a first-gear driven shaft; when the rotation speed of the first-gear driving gear is smaller than that of the first-gear driven shaft, the overrun clutch is in the overrun state, and power is not transmitted. A second-gear driven gear is connected with a friction clutch driving disc, and a friction clutch driven disc is connected with a transmission output shaft through a spline or a roller path. The first-gear driven shaft is connected with the friction clutch driven disc through an end cam. The torque serves as gear shifting parameters, and an electronic control or hydraulic mechanism is not needed, and therefore the transmission is suitable for occasions where a motor serves as a power source. Furthermore, the operating state of the motor can be changed through a motor controller so as to achieve intervention in gearing shifting rules and the gear shifting process.

Description

technical field [0001] The invention belongs to the technical field of transmissions and their controls, and relates to a torque return difference type two-speed automatic transmission and a gear shifting control method. Background technique [0002] With the development of the technical level, automatic transmissions are replacing manual transmissions and fixed ratio reducers in more and more fields. At present, the shifting mechanism of the existing automatic transmission includes electronically controlled hydraulic type, electronically controlled executive motor type, etc., and the electronically controlled shifting mechanism can realize complex and intelligent shifting rules. However, the cost of the electronically controlled shifting mechanism is relatively high, and the electronically controlled shifting mechanism is also the main failure point and technical difficulty of the current automatic transmission. Due to the limitations of volume and volume, manual shifting ...

AI Technical Summary

Problems solved by technology

However, the cost of the electronically controlled shifting mechanism is relatively high, and the electronically controlled shifting mechanism is also the main failure point and technical difficulty of the current automatic transmission. and volume limitations, currently the manual shift mechanism is mainly used

[0003] At present, there have been mechanical automatic transmissions that do not include electronic control mechanisms, such as mechanical automatic transmissions that use flying block clutches, and use speed as the shift parameter, but the impact of the shifting process is large, and the manufacturing of flying blocks and springs is consistent. High performance requirements, and after the assembly is completed, the shift schedule is fixed, which is not easy to adjust

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