自動(dòng)變速箱的換擋完全由變速箱控制模塊(TCU:Transmission Control Unit)進(jìn)行控制，其核心邏輯是在最佳的時(shí)機(jī)進(jìn)行檔位的切換，以保證車(chē)輛的動(dòng)力性、換擋的平順性和車(chē)輛的燃油經(jīng)濟(jì)性。

　　The shifting of automatic transmission is completely controlled by the Transmission Control Unit (TCU), whose core logic is to switch gears at the best time to ensure the vehicle's power performance, smooth shifting, and fuel economy.

　　TCU通過(guò)變速箱內(nèi)部的傳感器、整車(chē)控制模塊(PCM：Powertrain Control management)的實(shí)時(shí)監(jiān)測(cè)數(shù)據(jù)進(jìn)行檔位的切換，最主要的是根據(jù)車(chē)輛速度和油門(mén)踏板的深度（即駕駛員對(duì)動(dòng)力的需求）進(jìn)行及時(shí)的檔位切換。

　　TCU switches gears in a timely manner based on the vehicle speed and the depth of the accelerator pedal (i.e. the driver's power demand) through real-time monitoring data from sensors inside the gearbox and the Powertrain Control Management (PCM) module.

　　換擋分為升檔和降檔，升檔存在動(dòng)力升檔和滑行升檔兩種情況，降檔也存在動(dòng)力降檔和滑行降檔兩種情況。下面將結(jié)合具體的換擋曲線(xiàn)對(duì)四種升降檔情況進(jìn)行講解。

　　Shifting gears can be divided into upshifts and downshifts. Upshifts can occur in two ways: power upshifts and coasting upshifts, while downshifts can also occur in two ways: power downshifts and coasting downshifts. Below, we will explain the four types of upshifts and downshifts based on specific shifting curves.

　　對(duì)升降檔進(jìn)行講解前，我們首先了解一下?lián)Q擋線(xiàn)shifting schedule/shifting map。

　　Before explaining the upshift and downshift, let's first understand the shifting schedule/shifting map.

　　如下圖所示換擋線(xiàn)是一個(gè)由橫坐標(biāo)為車(chē)速(Km/H)縱坐標(biāo)為油門(mén)開(kāi)度(%)的圖。

　　The shift line shown in the following figure is a graph with the horizontal axis representing the vehicle speed (Km/H) and the vertical axis representing the throttle opening (%).

　　上圖中：實(shí)線(xiàn)為升檔換擋點(diǎn)的曲線(xiàn)，虛線(xiàn)為降檔換擋點(diǎn)的曲線(xiàn)。升檔換擋曲線(xiàn)會(huì)比降檔換擋曲線(xiàn)的車(chē)速更高。

　　In the above figure, the solid line represents the curve of the upshift shifting point, and the dashed line represents the curve of the downshift shifting point. The upshift shift curve will result in a higher vehicle speed than the downshift shift curve.

　　1、動(dòng)力升檔

　　1. Power upshift

　　正常油門(mén)開(kāi)車(chē)過(guò)程中，油門(mén)開(kāi)度維持一個(gè)相對(duì)穩(wěn)定的值，隨著車(chē)速的提高變速箱由一個(gè)低檔位升到一個(gè)高檔位。

　　During normal throttle driving, the throttle opening maintains a relatively stable value, and as the vehicle speed increases, the gearbox shifts from a low gear to a high gear.

　　如下圖所示:紅色箭頭的換擋過(guò)程，油門(mén)開(kāi)度在15%左右，車(chē)速由60kph提升到90kph的過(guò)程中，車(chē)輛在80kph完成咯5檔升6檔的動(dòng)力升檔過(guò)程。

　　As shown in the figure below, during the shifting process indicated by the red arrow, with the throttle opening at around 15% and the vehicle speed increasing from 60kph to 90kph, the vehicle completes the power upshift from 5th to 6th gear at 80kph.

　　2、滑行升檔

　　2. Coasting upshift

　　車(chē)輛在下坡過(guò)程中，油門(mén)開(kāi)度很小或者無(wú)油門(mén)情況下，隨著車(chē)速的升高，檔位跟隨者升高。這種比較簡(jiǎn)單，也很容易理解。還有一種是在超車(chē)或者急加速以后出現(xiàn)的滑行升檔。

　　During the downhill process, if the throttle opening is very small or there is no throttle, the gear follower will increase as the vehicle speed increases. This is relatively simple and easy to understand. Another type is coasting upshifting that occurs after overtaking or rapid acceleration.

　　如下圖所示:紅色箭頭的換擋過(guò)程，油門(mén)開(kāi)度在80%左右，車(chē)速在90kph，松掉油門(mén)踏板以后，油門(mén)開(kāi)度從80%向下掉，檔位從綠色實(shí)線(xiàn)的左上方4檔完成4檔升5檔。繼續(xù)往下走穿過(guò)紅色實(shí)線(xiàn)，完成5檔升6檔的過(guò)程。

　　As shown in the following figure: The shifting process of the red arrow, with the throttle opening at around 80% and the vehicle speed at 90kph, after releasing the throttle pedal, the throttle opening decreases from 80% downwards, and the gear shifts from 4th gear in the upper left corner of the green solid line to 5th gear. Continue walking down and cross the red solid line to complete the process of shifting from 5th gear to 6th gear.

　　3、動(dòng)力降檔

　　3. Power downshift

　　車(chē)輛進(jìn)行急加速或者超車(chē)時(shí)為了提供更好的加速性能，變速箱會(huì)進(jìn)行動(dòng)力降檔。

　　In order to provide better acceleration performance during rapid acceleration or overtaking, the gearbox will downshift its power.

　　如下圖所示:紅色剪頭的換擋過(guò)程，車(chē)速在90kph，踩油門(mén)進(jìn)行加速。油門(mén)開(kāi)度從18%左右提升到60%左右，箭頭穿越咯紅色虛線(xiàn)，變速箱完成了從6檔到5檔的切換，實(shí)現(xiàn)了動(dòng)力降檔過(guò)程。

　　As shown in the figure below: The shifting process of the red scissor is accelerated by stepping on the accelerator at a speed of 90kph. The throttle opening has increased from around 18% to around 60%, and the arrow crosses the red dashed line. The gearbox has completed the transition from 6th gear to 5th gear, achieving the process of power downshifting.

　　4、滑行降檔

　　4. Coasting downshifting

　　滑行降檔是我們最容易理解的換擋形式，每一次開(kāi)車(chē)都會(huì)遇到的一種換擋模式。

　　Sliding downshifting is the most easily understood form of shifting, and it is a shifting mode that we encounter every time we drive.

　　如下圖所示:紅色箭頭的換擋，車(chē)速?gòu)?0kph降檔40kph，紅色箭頭穿越咯紅色虛線(xiàn)和綠色虛線(xiàn)，完成咯6檔降5檔和5檔降4檔的兩次滑行降檔。

　　As shown in the following figure: shifting with a red arrow, downshifting from 90kph to 40kph, the red arrow crosses the red and green dashed lines, completing two coasting downshifts from 6th gear to 5th gear and from 5th gear to 4th gear.

　　自動(dòng)變速箱換擋的4種模式已經(jīng)全部講解完，除此之外，不同的駕駛模式如經(jīng)濟(jì)、運(yùn)動(dòng)、雪地本質(zhì)上是改變了這套換擋邏輯的“性格”。運(yùn)動(dòng)模式會(huì)讓升擋更遲、降擋更積極；而經(jīng)濟(jì)模式則相反，一切以省油為先。

　　All four modes of automatic transmission shifting have been explained. In addition, different driving modes such as economy, sport, and snow essentially change the "personality" of this shifting logic. Sports mode will make upshifts later and downshifts more aggressive; The economic model, on the other hand, prioritizes fuel efficiency.

　　簡(jiǎn)單來(lái)說(shuō)，自動(dòng)擋的換擋邏輯就像一個(gè)聰明的助手，它根據(jù)你的“腳法”和車(chē)輛狀態(tài)，自動(dòng)為你選擇最合適的擋位。

　　Simply put, the shifting logic of automatic transmission is like a smart assistant that automatically selects the most suitable gear for you based on your "footwork" and vehicle status.

　　淺見(jiàn)疏漏之處，懇請(qǐng)不吝賜教。

　　I apologize for any omissions and kindly ask for your guidance.

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