The advantages of Toyota 2AT are fast start, high speed and fuel economy. Toyota integrates the advantages of two gearboxes.
Nowadays, more and more people have given up manual transmission models and bought automatic transmission models. The gearboxes of automatic transmission models can be basically divided into three categories: AT gearboxes, CVT gearboxes and dual-clutch gearboxes, among which CVT gearboxes have the simplest structure, only a few hundred parts, smoother operation, better stability and lower cost. The principle of CVT gearbox is also relatively simple, mainly relying on two bevel gears plus a steel belt or steel chain to connect the transmission. The electronically controlled hydraulic device compresses and releases the two tapered wheels, thus changing the diameter and transmission ratio of the steel strip and realizing the purpose of stepless speed change. The whole shift process is controlled by computer, with stepless speed regulation and stepless speed regulation, so CVT gearbox is also called stepless gearbox. Although this kind of gearbox is cost-effective, its biggest disadvantages are poor transmission efficiency, small load torque and weak vehicle starting acceleration, so it will not be used in high-end models or racing cars. Toyota, Japan's largest automobile company, has strong technical strength and rich experience. They disdain to deeply develop CVT gearboxes. They spend more research and development funds and energy on AT gearboxes, and only use CVT gearboxes on the lowest-end models of Camry. AT present, the patents of AT gearbox technology adopted by high-end car dealers are basically monopolized by Toyota's Aisin brand and Germany's ZF brand. Nissan, another giant car company in Japan, has no way out even if it wants to develop AT gearbox, so they simply spend all their money on the in-depth research and development of CVT gearbox to improve its shortcomings, so we see that all automatic transmission models of Nissan come standard with CVT gearbox. Because Nissan is more specific, Nissan is more mature and stable than Toyota in CVT gearbox technology. Its masterpiece is Nissan Teana, which is a typical representative of its B-class car. It is not that Toyota has not improved the CVT gearbox. Toyota has added a gear set to the CVT gearbox equipped on its low-end models to improve the current situation of weak starting acceleration. This is effective, but the effect is limited. On the other hand, Nissan's improvement of CVT gearbox is even better. Nissan is directly equipped with an auxiliary transmission device on the original CVT gearbox. The transmission device of the auxiliary gearbox is connected in series with the driving wheel and the driven wheel, which makes the vehicle start very sensitively and quickly. Nissan has done a good job in improving CVT gearbox, but there is still a shortcoming that is difficult to remove from the root cause, that is, when the car is cold started at low temperature, the gear is easy to slip. Therefore, Nissan's automatic transmission models are equipped with low-temperature cold start protection conditions, which makes the gear slip better. At present, the torque of Scorpio CVT gearbox can reach 400 Nm, which is quite scary.