Novel automatic transmission without clutch and synchronizer and speed change method thereof

Abstract

The invention proposes a novel automatic transmission without a clutch and a synchronizer and a speed change method thereof. The automatic transmission comprises a first-gear driving gear, a second-gear driving gear, a combination gear arranged between the first-gear driving gear and the second-gear driving gear, a first-gear driven gear engaged with the first-gear driving gear, a second-gear driven gear engaged with the second-gear driving gear, a gear shifting control circuit, and a motor controller; rotating speed sensors are respectively arranged on the first-gear driving gear, the second-gear driving gear and the combination gear, and are used for measuring the rotating speeds and phases of the corresponding gears and sending to the gear shifting control circuit; the gear shifting control circuit adjusts the rotating speed of the combination gear through comparing the rotating speed difference between the combination gear and the driving gear to be combined with the combination gear in gear shifting until the rotating speed difference is in a set range; and when the combination gear and the driving gear to be combined with the combination gear in gear shifting are matched in phase, a shifting fork is driven to control the gear combination.

Description

technical field [0001] The invention relates to a novel clutch-free and synchronizer-free automatic transmission and a speed-changing method thereof, which belong to the technical field of electric vehicle control. Background technique [0002] With the development of technology, the market of electric vehicles is getting bigger and bigger. For electric vehicles, a transmission with high transmission efficiency, easy operation, stable operation and comfortable ride is very important. It is conservatively estimated that a good transmission can save more than 30% of electricity, and it can also expand the application range of electric vehicles, enhance the climbing ability of electric vehicles, reduce the power consumption of motors under overload conditions and improve the high-speed performance of electric vehicles. Reduce the power consumption of the motor and the controller for high-frequency operation, improve work efficiency, and reduce the manufacturing cost of the moto...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the automatic transmission adopts a hydraulic coupling, which can have a large slip ratio, so the shifting impact is small, and the frustration can be reduced, but due to the large slip ratio, its transmission efficiency is relatively low; the manual transmission Most of them use dry clutch, which has high transmission efficiency, but it does not allow long-term half-clutch slippage, which is easy to burn the friction plate, so the impact force is relatively large, causing damage to the transmission mechanism, and it is easy to feel frustrated after shifting, making people uncomfortable to ride; The mechanical automatic transmission (AMT) also has the problems of large shifting impact, strong frustration, and uncomfortable ride; the continuously variable transmission (CVT) has the advantages of comfortable ride and no frustration, and can also adjust the gear ratio according to the working condition of the engine. , but its power transmission efficiency is reduced and the cost is relatively high

Therefore, the most ideal speed change state is to control the motor or engine speed by adjusting the output signal of the accelerator pedal, so that the speed of the motor or engine matches the vehicle speed to reduce the impact force, but the above method is difficult and is not conducive to reducing driving difficulty. Improve comfort

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