Many veteran drivers and friends say that manual transmission is more fuel-efficient than automatic transmission. This sentence was indeed correct 20 years ago.
Now, it is already 2022 after all, and automatic transmission is no longer the automatic transmission of the past.
20 years ago, manual is actually generally fuel-efficient than automatic
- Early automatic transmissions were basically AT, with low transmission efficiency
20 years ago, dual-clutch was still a rare thing, and CVT technology is still a new thing, not so mature, so the automatic transmission at that time was generally AT. The working principle of
AT, we talked about before, is something called a torque converter to realize transmission. There is a problem with this device
. Zhang Pengcheng, a master's thesis at Northeastern University, said, "Research on the transmission efficiency of hydraulic mechanical automatic transmission and fuel economy of the whole vehicle".
says above: The energy loss is large during the transmission process of the torque converter. Research shows that the transmission efficiency of the hydraulic automatic transmission is generally lower than that of the manual transmission . If the efficiency is low, the fuel consumption will naturally be higher.
is like an old taxi used to use Santana Vista. I checked the fuel consumption. The manual fuel consumption is 8.3L per 100 kilometers, and the automatic one is 9.1L.
So the taxi master will tell us that manual transmission is more fuel-efficient. This is true. They will never say it wrong. They live on this, right? The automatic transmission of
- before did not have more manual transmissions
In addition to the defects of the structure itself, the automatic transmission of AT at that time was much less than that of manual transmission.
In the early years, the models were generally 4AT, with 5 gears in manual gears and 4 gears in automatic gears. A better car has a 6-speed manual gear with more gears, which can make the engine more fuel-efficient in working.
We talked about before that the engine has a thing called the best economic working speed range. In this range, it is the most fuel-efficient.
For example, if we play basketball, there are several points that are the most comfortable to shoot and are the easiest to shoot in, which is both labor-saving and comfortable.
Like Jordan and Kobe , they are better at mid-range shooting, right? If they are asked to compete with O'Neal , it will be very tiring if they are not good, right? The working range that the engine is good at is generally between 1500 and 3000 rpm. With more gears, the engine can have more time to work in the speed range, and the fuel consumption will naturally be lower.
It’s like we had 4 shooting points that were accurate, but they had to defend and interfere. Now there are 5 or 6 places that can be shot, and some people can’t defend, so our shooting success rate will be high.
's automatic transmission is generally more fuel-efficient.
- gears are becoming more and more diverse, and there are more and more
I just talked about that time. Now 20 years later, the number of automatic transmission gears has exceeded many manual transmissions.
8AT, 9AT, 10AT, it’s no wonder. There are now 6 gears in manual gears, which is quite a lot. On the other hand, automatic gears may have more advantages.
refers to a book published by the National Academy of Sciences in the United States, "Cost, Efficiency, and Deployment of Light Vehicle Fuel Economy Technology".
is given a data: Taking the transmission , the common transmission on the market as an example, theoretically, the fuel consumption of an 8-speed transmission can be reduced by 5% compared to 6-speed.
Moreover, now there is not only AT, the automatic transmission, dual clutch, CVT and other technologies are also becoming mature.
In a relatively accurate WLTP test, the multi-speed AT and dual-clutch will perform better in medium and high-speed fuel consumption than manual transmission.
CVT is better at low speed than manual transmission due to its continuous speed change.The matching of the engine gearbox of
- emphasizes economics very much
Moreover, in addition to the improvement brought by the so-called "talent" of gears, the automatic transmission is also "working" to improve the transmission efficiency.
The current coordination between the engine and the gearbox is carefully trained by the manufacturer to meet the increasingly stringent fuel consumption regulations.
South China University of Technology Long Haifeng has a master's thesis, "Research on the matching characteristics of a passenger car engine and automatic transmission".
says this: the automatic transmission can shift gears at the most appropriate time based on throttle opening , engine torque characteristics and other data to ensure the best combustion economy.
people are not computers after all, and we are not professional in automobiles. We cannot think about it every day and cooperate with the engine so accurately. If
is also turned on the manual transmission, different people will have a lot of habits, and the fuel consumption will be much different. There will be differences. Obviously, the probability of not reaching the optimal level is quite high.
Reference Man Xingjia and others of Wuling Automobile published a paper in the journal "Journal of Automobile Engineering ", "Research on the fuel-saving potential of manual transmission models equipped with gear shift prompt device".
Drivers can significantly affect the fuel consumption of the entire vehicle, and the difference can reach more than 10%.
means, "You should upgrade." "Oh, I will upgrade." "You should downgrade." "Oh, I will downgrade." This will save you 10%.
is turned on automatic transmission, at least there will be no problem of unskilled operation. Every prompt is prompted to operate the gear handle accurately.
- torque converter has a locking mechanism
Speaking of this, there is another problem that has not been solved. Isn’t the transmission efficiency of the torque converter we mentioned earlier very low?
In fact, although the new cars nowadays are also called torque converters, they are still different from the things on the old cars 20 years ago.
is still the previous paper, which says: In order to improve transmission efficiency, the engineer added a locking clutch to the torque converter to reduce transmission power loss.
locking structure can be directly combined with clutch when driving smoothly. Running high-speed is the same as that of manual transmission, so you won’t consume too much fuel due to the torque converter. Some new ATs also use more advanced multi-disc locking clutch, which will have a wider range of clutch locking and more fuel-efficient.
Ford Mustang As an example, from the WLTP test, medium speed, high speed and ultra-high speed operating conditions are all more fuel-efficient. Finally, the fuel consumption of 100 kilometers is 0.4L lower than that of the manual transmission.
. What are the friends who are still buying manual transmissions now?
- maintenance and repair are cheap, so you basically don’t have to worry about quality issues
manual transmission cannot be more fuel-efficient, are there any friends who are buying manual transmissions now? Yes, why buy it? Just to save worry.
manual transmission is simple in structure and mature in technology. It is indeed not easy to break. Nothing is broken, right?
Although the mechanical part of the automatic transmission is also very durable, it has an electronic system, which is still prone to problems. If it is broken, it will be very troublesome and expensive to repair.
hydraulic control valve For example, for better cars, you can buy 3 manual gearboxes directly, and manual gear maintenance is also cheaper.
Honda Civic , the price of 4S store, manual transmission, each time change oil, 4L, 168 yuan; CVT change oil, 8L, 328 yuan.
, and the maintenance frequency of manual transmission is also lower. Just change it every 60,000 km, and the CVT needs to change oil every 40,000 km.
- And some friends just like the operation sense
In addition to cheap maintenance, many friends choose manual transmission because they enjoy the operation sense they come.
Previously, our video talked about, Chongqing University Yi Xuefeng has a paper, "Pleasantness in the process of product use".
says: Compared with a single action, combining the basic usage actions in different forms can allow users to feel a deeper sense of pleasure.
Many people think that: if you automatically, just step on the accelerator, step on the brake, and then hit the direction, it doesn’t matter, just move.
operation manual transmission is complicated, bringing more pleasure and sense of accomplishment. "I drive well", right?
For enthusiasts, it is understandable that you tend to drive a manual transmission when buying a car.
manual transmission still has its own advantages.
. So in general, compared with automatic transmission, the current manual transmission is no longer as fuel-efficient as the old drivers said in the past.
, but it still has its own advantages. The manual transmission is not as expensive as the automatic transmission, it is more solid and durable, and economical.
For some friends, without this thing, they cannot meet their psychological needs for good driving skills.
manual transmission how much is more fuel-efficient in conversion
After hearing this, some old drivers wanted to say: "Now, it is still more fuel-efficient in automatic transmission. What's going on with ?"
is bragging? Or is it an individual phenomenon? Or is it just right?
now has many automatic transmissions, including CVT. In fact, there are not any + and - signs, but also support manual gear shifting.
In order to change gears, I will buy an additional manual gear. Is necessary? automatic manual mode, is easy to use?
- Keywords: Manual transmission
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References
[1] Zhang Pengcheng. Research on the transmission efficiency of hydraulic mechanical automatic transmission and fuel economy of the whole vehicle [D]. North China University, 2017.
[2] Cost, efficiency and deployment of fuel economy technology for light vehicles. National Academic Press
[3] Long Haifeng. Research on the characteristics matching of a passenger car engine and automatic transmission [D]. South China University of Technology, 2013.
[4] Man Xingjia, Wu Shaoning, Gao Yong, He Run. Research on the fuel-saving potential of manual transmission models equipped with gear shifting prompt device [J]. Journal of Automotive Engineering, 2017.
[5] Yi Xuefeng. Pleasant feeling during product use [D]. Chongqing University, 2007.
