手動(dòng)機(jī)械傳動(dòng)采用齒輪直接驅(qū)動(dòng)，傳動(dòng)效率高，機(jī)械損耗小。因此，它可以說(shuō)是理論上省油的變速箱。當(dāng)然，這種節(jié)油變速箱必須基于對(duì)變速箱的精確控制（掌握換檔正時(shí)等）

Manual mechanical transmission adopts gear direct drive, with high transmission efficiency and low mechanical loss. Therefore, it can be said to be a theoretically fuel-efficient gearbox. Of course, this fuel-efficient gearbox must be based on precise control of the gearbox (mastering shifting timing, etc.)

自動(dòng)變速箱（at）、無(wú)級(jí)變速箱（CVT）和雙離合器變速箱（DSG）屬于自動(dòng)變速箱。

Automatic transmission (AT), continuously variable transmission (CVT), and dual clutch transmission (DSG) belong to automatic transmissions.

自動(dòng)變速箱（at）是指液壓自動(dòng)變速箱。它是由液力變矩器、行星齒輪和液壓控制系統(tǒng)組成的自動(dòng)變速箱。傳動(dòng)扭矩是通過(guò)液壓傳動(dòng)和齒輪組合來(lái)實(shí)現(xiàn)的，傳動(dòng)效率低，功率損耗大。因此，這種自動(dòng)變速箱耗油較多。但由于變速箱通過(guò)液壓傳遞扭矩，沖擊小，傳動(dòng)平穩(wěn)。

Automatic transmission (AT) refers to a hydraulic automatic transmission. It is an automatic transmission composed of a hydraulic torque converter, planetary gears, and hydraulic control system. Transmission torque is achieved through a combination of hydraulic transmission and gears, with low transmission efficiency and high power loss. Therefore, this automatic transmission consumes more fuel. But due to the transmission of torque through hydraulic pressure, the impact is small and the transmission is smooth.

無(wú)級(jí)變速箱由兩個(gè)直徑可變的傳動(dòng)輪和中間套筒上的傳動(dòng)鋼驅(qū)動(dòng)。CVT可以實(shí)現(xiàn)大范圍的無(wú)級(jí)變速，從而獲得傳動(dòng)系統(tǒng)與發(fā)動(dòng)機(jī)工況的佳匹配。因此，從理論上講，它所能帶來(lái)的燃油經(jīng)濟(jì)性是好的。然而，CVT的鋼帶傳動(dòng)效率無(wú)法與傳統(tǒng)的手動(dòng)齒輪傳動(dòng)機(jī)構(gòu)相比，不能說(shuō)它是省油的傳動(dòng)。由于鋼帶強(qiáng)度的限制，變速箱不能用于大扭矩的傳動(dòng)，因此發(fā)動(dòng)機(jī)扭矩較大（大于300nm左右）時(shí)不適用。

The continuously variable transmission is driven by two variable diameter drive wheels and a drive steel on the middle sleeve. CVT can achieve a wide range of continuously variable speeds, thereby achieving a good match between the transmission system and engine operating conditions. Therefore, theoretically speaking, the fuel economy it can bring is good. However, the steel belt transmission efficiency of CVT cannot be compared with traditional manual gear transmission mechanisms, and it cannot be said that it is an fuel-efficient transmission. Due to the strength limitation of the steel strip, the gearbox cannot be used for high torque transmission, so it is not suitable for high engine torque (greater than about 300nm).

雙離合器變速箱以手動(dòng)變速箱為基礎(chǔ)：雙離合器自動(dòng)變速箱由軸驅(qū)動(dòng)，傳動(dòng)部分由行星齒輪驅(qū)動(dòng)。動(dòng)力傳動(dòng)原理與傳統(tǒng)的手動(dòng)變速箱相同，傳動(dòng)效率高，機(jī)械損耗小，但變速箱的控制比手動(dòng)更精確，所以對(duì)于普通人來(lái)說(shuō)，雙離合器變速箱當(dāng)然比手動(dòng)變速箱更省油，它具有經(jīng)驗(yàn)豐富的老司機(jī)，手動(dòng)控制比自動(dòng)控制更精確。在這種情況下，手動(dòng)控制比DSG更省油。實(shí)際上，DSG是技術(shù)含量高、綜合性能和經(jīng)濟(jì)性優(yōu)越的變速箱。

The dual clutch transmission is based on a manual transmission: the dual clutch automatic transmission is driven by a shaft, and the transmission part is driven by planetary gears. The power transmission principle is the same as that of the traditional manual transmission, with high transmission efficiency and low mechanical loss, but the control of the transmission is more accurate than that of the manual transmission. Therefore, for ordinary people, the dual clutch transmission is certainly more fuel efficient than the manual transmission. It has experienced drivers, and the manual control is more accurate than the automatic control. In this case, manual control is more fuel-efficient than DSG. In fact, DSG is a gearbox with high technological content, superior comprehensive performance and economy.

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