When the cvt gearbox runs 55 yards, the alarm speed rises to 3000 rpm.

Compared with other traditional gearboxes, CVT has a short history, but it has been used for more than ten years. It should be said that it is a very mature product. However, many people don't know much about CVT, because its assembly is few (it has only increased slowly in the past two years), and there are some misunderstandings about the use method and working characteristics of CVT, and even some wrong views about it. I didn't really get in touch with CVT gearbox until I bought Jin Xuan. Through the use of this period of time, I gradually found out some of its characteristics. Because my work is related to machinery, and I like to ponder, I write this article boldly, hoping to help you better understand CVT gearbox through straightforward language and examples, so as to use it more conveniently. Because I am not a professional, I will inevitably make some mistakes. I hope everyone will correct me! The first thing to note is that CVT is "stepless" compared with other gearboxes (it has nothing to do with the bad film directed by Chen Kaige). Other gearboxes MT, AT, AMT and DSG all have gears, no matter whether it is 4th gear, 6th gear or 8th gear, they all have gears. If there are several gears, there are several fixed transmission ratios, and the engine and vehicle speed can only match within these transmission ratios. CVT itself is the concept of no gear. The so-called 6-speed CVT is simulated to let people find the feeling of traditional gearbox. If the automobile manufacturing company wants, it can change it to 3-speed CVT, 7-speed CVT, 10-speed CVT or even 100-speed CVT at will by brushing the computer. So when discussing CVT, we must pay attention to it. In D mode, CVT has no concept of shifting gears, only the change of transmission ratio, which is very important! Regarding the specific structure and principle of CVT, you can have a look. Very much, and very clear, so I won't say much. Let me briefly analyze the two biggest problems you encounter when using CVT: insufficient power and suspected slipping. First, the problem of insufficient power CVT itself is not good at sports, but today's CVT is definitely not a short board of automobile power. As for why people generally feel that CVT has insufficient power? I try to analyze it from both subjective and objective aspects. Subjective aspect: the deepest power should be felt in the acceleration stage, and the acceleration performance of the vehicle is mainly felt by pushing the back in the acceleration stage. The feeling of pushing back is easier to feel when it is gradually strengthened. If it doesn't change, people tend to get used to the back thrust and can't feel it. Generally, the acceleration of vehicles is constantly changing during the acceleration process, and it is gradually strengthened at the initial stage of acceleration, that is, the feeling of pushing back is gradually strengthened, which makes people feel that the vehicles are constantly accelerating. From a big perspective, CVT only has a feeling of pushing back at the moment of acceleration, and then the acceleration remains unchanged or slowly decreases, which makes people not susceptible to the feeling of pushing back and feels that the vehicle accelerates slowly. In fact, you only need to look at the speedometer to know that the acceleration is not slow at this time. One advantage of this smooth acceleration curve is that it avoids frequent shaking back and forth and makes people feel more comfortable. The disadvantage is that the driver lacks driving passion. The objective reason for viewing the big picture: At present, most cars matching CVT tend to be economical and comfortable. Take Jin Xuan as an example. No matter what the vehicle speed is (below 100km/h), the engine speed is kept below 1500rpm/min during the process of driving at a constant speed. In this way, when CVT suddenly accelerates, the first thing to do is to adjust the transmission ratio, and make the engine speed enter its power range by adjusting the transmission ratio. This is slower than the traditional gearbox, which leads to the lag of initial acceleration. Although you can catch up quickly in speed, it is more difficult to catch up with the initial falling distance. This difference is obvious at low speed, because at low speed, the traditional gearbox is in low gear and the transmission ratio has been fixed at a higher value. The advantage of high-speed CVT appears, because it can improve the transmission ratio faster and let the engine enter the power range earlier. Look at the big picture. This is the 0- 100km/h comparison test chart of Yinglang 1.6T and Tiida1.6t. Yinglang uses a 6-speed automatic gearbox and TiIDA uses a CVT gearbox. The 0- 100km/h acceleration time of these two cars is similar, but TX, who has studied calculus, knows that the area enclosed by the speed curve and the horizontal axis of time is the moving distance. It can be clearly seen from the above figure that although the 0- 100km/h acceleration time of Tiida is shorter, its driving distance is obviously less than that of Yinglang. What does this mean? If two cars start side by side at the same time, Tiida will lag behind Yinglang, and Yinglang's distance advantage will reach the maximum until about 6. 1 s (where I draw the orange line), and then Tiida will gradually shorten this distance, which is the disadvantage of CVT in the initial stage. But from another angle, if two cars accelerate from 80km/h side by side, Yinglang will lag behind Tiida, which is the advantage of CVT in medium and high speed. PS: This picture is the only one I found on the Internet that puts the acceleration curves of at and CVT together. The reference of this picture has nothing to do with these two cars, just help me explain my point of view. Let me talk a little more about the power of CVT. All the acceleration curves above are tested under the limit of full throttle (also called floor oil), which is rarely encountered in our daily driving, especially at the beginning, at most, it is a big foot throttle. Under the condition of large throttle, the engine speed and speed of traditional gearbox increase at the same time. Generally, at 3000 rpm, everyone will add gears. In the case of CVT with big foot throttle, the first change is the transmission ratio, so you will find that the engine speed has not increased, but almost 4000. At this time, many people unconsciously turn off the throttle for fear of engine or noise, which limits the power output of the engine. In fact, the engine will not be damaged if it runs at a high speed for a short time. Don't worry. Last time I ran a long distance, the oversized car on the provincial road was often floor oil, and the speed soared to 5000+. A small test can be made about the acceleration performance of Jin Xuan at medium and high speed. First, we must ensure safety. On the high-speed road with good road conditions and few vehicles, set the car to cruise at a constant speed of 120km/h, then brake to reduce the speed to 50 km/h, after confirming that the road ahead is in good condition, release the accelerator and brake, and press RES to make the car cruise at a constant speed of120km/h .. Feel it and see if it can exert such power at ordinary times? Note: Be sure to test under the condition of good road conditions and few vehicles to ensure safety and be psychologically prepared for vehicle acceleration. At the same time, you'd better be ready to put your right foot on the brake. Second, there are many TXs that use CVT for the first time. At the beginning, they will find that when they step on the accelerator deeply, the speed does not add up, but rises very high. Therefore, according to anecdotal reports, some TXs doubt whether CVT steel belt slips. Even some TXs think that slippage is a working mode of CVT. First of all, it must be clear that if the CVT slips, it must be a serious fault. At present, it is basically impossible to repair, and only the assembly can be replaced. Secondly, the failure rate of CVT will never be as high as rumored, otherwise there will not be so many manufacturers widely used in home production vehicles, and the proportion of steel belt slippage in all failures will be even less. Everyone's suspicion comes more from ignorance of CVT, and there is no lack of credit from gunmen. At present, CVT basically has the same life as the vehicle, and it is maintenance-free for life, so you can use it with confidence. As for CVT can't transmit large torque, in fact, any kind of gearbox has its limits, but the traditional MT and AT limits are higher. The DSG that Volkswagen is pushing now is divided into 6-speed and 7-speed, in which the 7-speed DSG can bear the maximum torque of 250NM and the 6-speed DSG can bear the maximum torque of 350NM. Therefore, small displacement vehicles such as golf are equipped with 7-speed DSG, and large displacement vehicles such as Magotan are equipped with 6-speed DSG. Manufacturers are also well aware of the limits that CVT can withstand, so they will not put CVT and engines that exceed its limits in a car. As for the maximum torque that CVT can bear? I'm afraid it depends on the specific model. Below I list some medium-displacement vehicles equipped with CVT found on the Internet as follows: Guide 2.4 Maximum torque 220NM Outlander 2.4 Maximum torque 226NM Koleo 2.5 Maximum torque 226NM Qi Jun 2.5 Maximum torque 227NM Kaiser 2.4 Maximum torque 230NM Teana 2.5 Maximum torque 232NM These vehicles are all larger than our Jin Xuan 197NM maximum torque, among which Outlander, The maximum torque of the Outlander 3.0 engine reached 29 1nm, so Mitsubishi did not equip him with CVT, and replaced it with 6-speed AT, so I infer that the maximum torque we can bear with this CVT gearbox should be around 250NM. Don't worry, if you want to skate, Outlander will skate first, not the younger brother. In fact, with the development of technology and the use of new materials, the maximum torque that CVT can achieve has been greatly improved, and some of them can meet the needs of large-displacement vehicles, such as the maximum torque of Tianzhu 3.5L and Lexus GS3.5L, which are all matched with CVT gearboxes. When I used CVT, I found that the maximum torque was Audi A6L 2.7TDI (diesel vehicle), and its maximum torque even reached 380NM. Let me explain speed and speed again. Modern cars basically use electronic throttles. Different from the original cable throttle, the electronic throttle does not directly control the throttle opening, but controls the throttle through ECU. The specific principle and process are not the focus we want to talk about. You can Baidu it. With the improvement of automobile electrification, ECU becomes more and more intelligent, from simply correcting the throttle opening and air-fuel ratio to judging the driver's intention through the change of accelerator pedal. As I mentioned earlier, the adjustment of CVT is generally based on economy, which leads to the engine being at the best economic speed instead of the best power speed in daily driving, which intuitively means maintaining a relatively low speed. When you step on the accelerator more deeply, ECU judges that you need to accelerate, and judges that you need to accelerate according to the specific depth. For the traditional gearbox, ECU directly commands the engine to increase the air intake and fuel injection to obtain more power. If the gearbox is aggressive, it may be shifted down one gear. For cars equipped with CVT gearbox, the first command of ECU is to let the gearbox quickly increase the transmission ratio, so that the engine can reach the speed that can output more torque. For example, the original speed is 60km/h, the transmission ratio of the gearbox is 1, and the corresponding engine speed is 1500rpm/min. As soon as ECU stepped on the accelerator, it decided to accelerate, so it first increased the transmission ratio to 3. This process is very fast, usually in a few tenths of a second. It is impossible for the vehicle speed to increase and keep at 60 km/h in such a short time, but the engine can increase to the corresponding speed of 4500 rpm/min in a short time, which is also the most ideal engine speed, so the vehicle speed starts to increase, and the transmission ratio of the gearbox is continuously changed to keep the engine at 4500 rpm/min. When the vehicle speed is increased to 90 km/h, the engine is still 4500 rpm/min, but the transmission ratio has been changed to 2. At this time, you feel that you have reached the desired speed and released the throttle. ECU judges that the acceleration is over and resumes the economic working mode. So the transmission ratio quickly increased to 0.67, and the engine speed correspondingly decreased to the economical speed of 1500rpm/min. Keeping the vehicle speed above 90 km/h is a complete vehicle acceleration process with CVT gearbox, in which the engine kept at 4500 rpm/min during the whole acceleration process, not slipping, but the CVT gearbox was constantly changing the transmission ratio. PS: The transmission ratio of the gearbox generally refers to the speed ratio between the input end (connected to the engine) and the output end (leading to the wheels) of the gearbox. For example, a transmission ratio of 3 means that the input rotates three times and the output rotates 1 time. So the relationship between engine speed and vehicle speed is: vehicle speed =k* (speed/transmission ratio). Where k is the coefficient for calculating parameters such as main reducer and wheel radius. These parameters are different for each car, but the same car remains the same. Finally, let me talk about some driving feelings and methods about CVT that I summarized in the wonderful driving process. The biggest advantage of CVT is ride comfort. Now I also take smooth driving as my pursuit goal, so that people who are prone to carsickness will not feel uncomfortable in my car and seek my driving pleasure from it. However, CVT is not synonymous with meat. Increase the throttle reasonably and boldly. I believe that your car in the city will not let you down too much. I haven't driven other CVT models. As far as Jin Xuan is concerned, its economic adjustment still cannot hide Mitsubishi's yearning for sports. When I refuel, Xiao Xuan will immediately increase the speed and tease me to refuel. Give more oil. Maybe it's because I used to drive a Fukang 3000 to shift gears all the year round. I don't hate the sound of the engine. 4B 1 1 The sound made by the engine after changing the synthetic engine oil felt like a cheerful chirp. Of course, there are not many opportunities to get to 4000, and I still keep the economic speed most of the time. When you step on the accelerator quickly, Jin Xuan often stops and accelerates. If you want to accelerate more smoothly, you should step on the accelerator from slow to fast. For example, if you need to speed up overtaking, you can step on the accelerator earlier, and you will not hesitate to step on it as soon as you feel faster, and there will be no frustration. In addition, the maximum speed of the dazzling engine when accelerating is basically proportional to the depth of the throttle. Generally, the engine with light acceleration will reach more than 2000 rpm, and the engine with large throttle will reach 4000+, so there is nothing to say. The floor oil will definitely reach 6000 rpm. It seems that the dazzling CVT is not adjusted very well when going uphill. The engine is still at a low speed, and I feel very tired. When you step on the accelerator deeply, the engine speed will often be pulled higher than that on a flat road, making it difficult to control the speed. Therefore, it is recommended to use manual mode on slopes that are not very smooth.