The young dragon slayer turned into an evil dragon? Mijia sweeping and dragging robot VS Cobos N8PRO

Talking about the basic pattern of sweeping robots:

Speaking of the topic of sweeping robots, you can never get around Irobot, Cobos , Stone, Mijia, 360. Among them, the ones that everyone pays more attention to are the machines of the following four domestic brands.

Cobos, Stone, Mijia and 360:

① Cobos has the thickest foundation, has been engaged in related industries for the longest time, and is the only company in the industry that has both mastered lidar navigation technology and is well versed in lidar navigation technology. The manufacturer of the principle of visual imaging. Speaking of offline channels alone, Cobos is definitely the most popular brand image among these companies. But Cobos has a problem: the product line is too complicated, and many people want to buy it but don’t know how to choose;

② stone has suddenly emerged. By providing the first generation of floor sweeping robots for Mijia, it became popular with one shot and gained both fame and fortune. , And quickly completed the listing in just a few years. Everyone can see the power of stone products, but the problem of stone is also obvious, that is, "expensive";

③ Mijia , as the "pro son" of Xiaomi, its products have always become industry spoilers with good industrial design and super high cost performance. Therefore, it has attracted much attention. No matter what brand of machine it is, it will always be compared with Mijia products by netizens. As for the shortcomings, of course, the update speed is slow, and it will only be replaced in three or four years;

④ As for 360, the host doesn’t even know when this brand suddenly became popular. Since its inception, it has always been "cross-level competition". The way, benchmarking several other products, also gained a large wave of fans. Overall, the product is cost-effective, but the details need to be optimized.

Therefore, each brand has its own strengths and weaknesses. If you have to ask "Which brand of product is the best", I am afraid there will never be an answer. But if you list two specific models with similar prices, you can make a simple comparison.

Left: Mijia sweeping robot; right: Cobos N8 PRO

This article is mainly brought to everyone, officially two sweeping robots with similar prices, one of which is the highly concerned “Mijia sweeper” Drag robot", the other is the N8 upgrade N8 PRO that Cobos will promote in the second half of this year. ▲

Appearance comparison:

Left: Mijia sweeping and dragging robot; Right: Cobos N8 PRO

Mi sweeping machine LDS lidar navigation solution, while Cobos N8PRO uses industry-leading dToF navigation technology. There is a raised navigation module on the top of the two machines. Looking down from the top panel, the Mijia sweeping and dragging robot on the left (referred to as "Mijia" below) has two buttons on the top, namely the start button and the recharge button; the Cobos N8 PRO (hereinafter referred to as "Kovo “S” refers to) there is only one start button on the top ▲

. In other respects, the two machines are of the same size and close in height; Cobos uses an independent external water tank, but the Mijia design cannot be seen from the outside.

left: Mijia sweeping robot; right: Cobos N8 PRO

open the top panel, the dust box is exposed ▲

But the difference is that the Mijia dust box is actually a water tank + dust box combo Design-this is also seen from the outsideThe reason to the water tank; and Cobos is a big transparent dust box.

The host compared the differences between the two machines in the water tank capacity and the dust box capacity. The list is shown above. It can be seen that the Cobos machine has obvious advantages in both parameters ▲

Mijia sweeping and dragging robot

Cobos N8 PRO

Easy one-handed realization ▲

If we carefully observe the above animation, we can easily find that the dust inlet of Mijia is at the back; while the dust inlet of Cobos is at the front (the machine is placed in the same direction).

Left: Mijia sweeping and dragging robot; Right: Cobos N8 PRO

In the forward direction of the robot, the sensors used by the two are different: on the left Mijia only uses an infrared detector for sensing Obstacles ahead; while Cobos uses a relatively complex "3D structured light technology" , which is said to be 10 times more accurate than infrared technology.

In addition, from this perspective, we can easily find that Mijia adopts a unilateral brush design ; while Cobos uses an ancestral bilateral brush . The role of the side brush when the sweeping robot is working is to clean the dust at the corners. Therefore, the advantage of the double-sided brush is to improve the cleaning efficiency. At the same time, it has the advantage of two-way gathering. The disadvantage is that the high-speed rotating side brush is easier to fly during normal work. Rubbish.

Left: Mijia sweeping and dragging robot; Right: Cobos N8 PRO

Then continue to talk about dust box. Mi's dust box dust inlet is smooth and unobstructed; while Cobos' dust box dust inlet has a thin check valve film ▲

has a large one-way valve plate The function is that when the user takes out the dust box, it can effectively prevent the dust from pouring out from the dust inlet again.

The Mijia sweeping and dragging robot

is at the other end of the dust box, which is the exhaust port. Mijia only uses a traditional single HEPA filter element to filter the dust. The result is that a thick layer of ash is accumulated during travel, even if it is beaten hard. Clean, or gray ▲

Cobos N8 PRO

while Cobos uses the latest metal mesh + sponge filter + HEPA filter such a triple filter ▲

This design advantage is obvious, that is, the life of the HEPA filter is obvious. Upgrade, and the metal is easier to maintain when it is washed with water.

PS: The HEPA filter in the above picture has a clear contrast in the degree of contamination. One reason is that the owner of the Mijia machine has used it for nearly a year, while the Cobos machine has used it several times. But the advantages and disadvantages of the two designs are obvious.

Another point, which is also a huge selling point of Cobos N8 PRO, is that Cobos has the "wash-free wet mop" that has been equipped since the N8, but Mijia does not ▲

This wet mop has the function of sterilization and disinfection. In addition, useIt is also more convenient. It can be thrown away directly after use, saving the trouble of cleaning.

Left: Mijia sweeping and dragging robot; Right: Cobos N8 PRO

robot turning over to see the bottom, Mijia only has 4 drop drop sensors; Cobos has 6 top-level zzzz ▲ 14zz

Left: Mijia sweeping robot; right: Cobos N8 PRO

Then compare the size of the obstacle crossing wheel. The measurement method of the original poster is relatively rough, but one thing is obvious anyway, that is, Mijia’s obstacle-crossing wheel is slightly smaller than Cobos’s. Last lap ▲

The size of the obstacle-crossing wheel directly determines the machine’s ability to overcome obstacles. weak. However, based on the landlord's use experience of about a year, the Mijia machine is also fully usable in most household scenarios. The last comparison of

is the charging base: Mijia uses side contacts to avoid the possibility of poor contact caused by dirty contacts after long-term use; Cobos uses bottom contacts to make the base more stable. It's a pity that the Mijia base does not have a wire storage design, so it can only be completely exposed, and the aesthetics is not good. ▲Z15z

The comparison of appearance is here. Let's analyze the parameters that are invisible from the appearance. Parameter analysis of

:

Parameter analysis part of the original poster mainly compares the parameter differences that cannot be seen from the appearance. One of the very important points is that this N8 PRO of Cobos applies the TrueMapping navigation of dToF technology, but Mijia does not.

From the appearance, both have a bulge on the top. This is a typical lidar sensor protective cover design-but the technical principles of the mapping scheme based on the two are completely different: still uses the traditional LDS navigation; while Cobos is equipped with the most advanced TrueMapping navigation based on dToF technology .

Friends who are concerned about technological parameters should not be unfamiliar when they see "dToF time-of-flight ranging navigation ". This technology is mostly used in the aerospace field and is also the same technology carried by the iPhone. Compared with LDS navigation, dToF time-of-flight ranging navigation has a larger scanning range, higher accuracy, and faster mapping .

For sweeping robots, the navigation solution is one of the core technologies, so the improvement of navigation technology is still a key indicator.

In addition to the upgrade of navigation technology, Cobos has also optimized the raised lidar sensor, adding a protective device around the sensor to directly eliminate the possibility of foreign objects or dust entering, and also avoid Sensor stuck caused by sudden changes in light intensity ▲

So many people may not have a concept. Let’s take a look at the traditional lidar sensor design:

The traditional sweeping robot that uses lidar sensors to achieve navigation, including this meter in the hands of the host At home, its sensor is exposed to the air, and there is only a top cover on it for protection ▲

If you have carefully observed this component, it is not difficult to find that the sensor rotates at a high speed when it is running. This also means that once there are foreign objects on the side such asSmall beads enter, it is very easy to damage the sensor-this is also an important reason for the repair of the machine using the Lidar solution.

Therefore, the Cobos N8 PRO packaged the lidar sensor from the side after this upgrade, which can be regarded as a technological breakthrough.

TrueDetect 3D module

Next to analyze this point, the original poster mentioned in the previous content, but did not expand it in detail, that is, this Cobos N8 PRO is equipped with "zTrueDetect 3D structured light sensing technology z15, z21 The barrier capability is 10 times higher than that of traditional infrared detectors.▲

3D structured light recognition module

3D structured light may not be very familiar to ordinary consumers, but the application field of this technology has already penetrated everyone. The most common usage scenario is face recognition.

In the face recognition scene, the projector projects thousands of line lasers that are hard to see to the human face, and then the receiver receives the reflected line lasers to obtain the face information, and then the chip Compare the database to identify and match.

And the recognition accuracy of this technology is extremely high. Cobos applies this technology to the daily obstacle avoidance scene of the sweeper, which brings the N8 PRO's obstacle avoidance ability to a big step.

The comparison of the other two parameters is simpler:

1. In the mopping mode, Mijia’s obstacle crossing ability is 8mm, and Cobos has a better obstacle clearance ability (more and more rounds, and 16mm more. The design of the mopping module is different);

2, the maximum suction is 2100Pa for Mijia, and 2600Pa for Cobos. Product interpretation of

:

After the comparison of the above long talk, in order to compare the hardware parameters of the two machines more clearly, the poster lists the above two tables ▲

About these differences, the host's personal understanding It's like this:

① Regarding navigation technology , dToF is better than LDS, and in the foreseeable future, the former should completely replace the latter;

② obstacle avoidance technology , 3D structured light needs to rely on certain visual recognition technology. Basic, high barriers to entry, compared with traditional infrared obstacle avoidance, both accuracy and experience are greatly improved;

③The host found in many tests that in most cases, 4 cliff sensors are enough to support the sweeper It will not fall during normal work. Therefore, the setting of 6 cliff sensors of Cobos is more like a kind of "excess performance", which will show advantages under extreme conditions;

④ There is no consensus in the industry regarding the setting of the number of side brushes. The host personally thinks that the single-sided brush is not the key. The key lies in how to realize the frequency conversion work of the side brush through the algorithm: For example, when working normally, the side brush rotates at idle speed to prevent flying dust; and when the sweeper is running against the wall, paste The side brush on one side of the wall runs at high speed to achieve the purpose of cleaning the dust in the dead corner;

⑤ Cobos's water tank capacity and dust box capacity are obviously ahead of Mijia, which can achieve longer battery life, which undoubtedly makesThe sweeping robot is more convenient to use;

⑥The increase of the maximum suction can theoretically make the cleaning ability of the sweeping robot stronger. However, this should not only be based on the suction parameters, but also combined with the main roller brush structure. In terms of actual experience, the host feels that the cleaning capabilities of the two machines are similar, and there is no obvious difference; in the mopping mode, Kovo The obstacle crossing ability is improved by , which can better adapt to the pits in the home environment.

Therefore, in terms of configuration, the Cobos N8 PRO, which was released more than a year late, surpasses the Mijia sweeping and dragging robot in almost all directions.

And from the actual mapping effect, the N8 PRO of Cobos is indeed better, and the outline of the corners of the room is more accurate. ▲

But the Mijia mop robot also has its unique advantages in APP, such as You can directly access the Mijia APP, which is more convenient to manage; for example, there are more detailed functions that can be set-but it is also easy to cause the management screen to be too complicated. In terms of software functions of

, both support multi-map management, support manual division of areas and autonomous naming of areas, support adjustment of working air volume, support for carpet pressurization mode switch...It can be said that there are all.

As for the advantageous obstacle avoidance function in the original text description, the original owner made a special test to compare the difference between the two:

2 double speed

The first thing to show is the large obstacle avoidance animation of Mijia, directly against the box. Obstacle avoidance effect is not ideal ▲

2 times speed

Then there is a pack of toys in transparent packaging tape in front of the robot, it is still mounted on one end▲

2 times speed