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Resistance weight loss ring
Hello, everyone, I am the president of the electric car commune.

In the President's Tucki P7 interest group, friends had a heated discussion on whether to choose a larger 19 inch wheel hub.

There is only one reason to choose it: it looks good!

And to be honest, the optional price of 5,000 yuan has upgraded the temperament to a higher level, and it has also been upgraded from the Maxxis VS5 tire to the Michelin PS4, which is totally worth the fare.

In fact, when Tucki P7 was first launched, the NEDC battery life of 706 really attracted the attention of many friends.

However, because it is the lowest version, it is not equipped with L2 autopilot system, and the configuration is not high enough, so there are not many riders who choose it, only 2%.

But the number 706 is excavated bit by bit by details:

First, the power-consuming L2 autopilot module was abandoned, which reduced the weight by 25kg and reduced the power consumption at low speed. In addition, the low wind resistance hub cover can reduce the power consumption at high speed, which makes this long battery life achievement.

In other words, when P7 was first released, it used the method of official certification, adding an extra 50 kilometers of battery life!

In addition to the official, there are many "indigenous methods" for old drivers.

For example, put on more economical tires with lower rolling resistance, or push up the tire pressure, or even throw away the behind vehicle tools ... It is said that the oldest driver can run more 100 km than NEDC!

Is the old driver's method really that magical? What's the doorway here?

Today, the president will have a good talk with you.

In fact, in the Tesla model? When it first went on the market, many foreign friends had already tested how big the battery life gap was with or without hubcaps.

But judging from the results, there is quite a taste of metaphysics:

An electric rental company in Germany measured that at the speed of 150km/h, the real endurance can be improved by 2.6%. The test result of a broadcasting company shows that at the speed of 1 12 km/h, the power consumption is reduced by 4. 1%.

As for the more authoritative Car magazine car? And then what? Driver, the conclusion is that under the environment of 6℃ and 2.8Bar tire pressure, the speed of 80, 1 13 and 145 can run 3.2%, 2.8% and 4.7% more respectively.

What if this is a Tesla model with a long rear-drive battery life? 3, can improve the battery life of 20-30 kilometers!

No wonder P7, BYD Korea and other new energy vehicles are not stingy with the cost of this small hub cover-the improvement of endurance is real!

Of course, it's not just the hub cover that can improve battery life.

For most models, the tire pressure for inflating tires according to the instructions is generally between 2.3 and 2.6.

And Tesla models? 3. We adopted a tire pressure of 2.9Bar far exceeding other brands, making the tire more "drum" and harder! It is said that it can increase the cruising range 10% compared with the tire pressure of 2.3Bar.

There's another pattern? American car owners reported at the forum that the power consumption soared from 200 to about 230 after replacing larger wheels.

The president can't help wondering: it seems that all the problems point to two culprits: wheels and tires. Besides, it seems to be related to friction?

However, the following case is even more exciting:

There are many Geometric A owners on the Internet who criticize the tire size.

Perhaps due to aesthetic considerations, the hub of the top model of Geometry A was directly upgraded from 16 inch to 18 inch, which was 2 inches larger than that of the middle and low models.

According to the previous Tesla model? According to the owner of S, the battery life should be reduced.

However, the endurance of the geometry A high-end and low-end models is actually exactly the same!

Will this be related to the owner reducing the tire size of 10mm?

If you want to know why, the president must tell you a little about why the car is running. According to middle school physics knowledge, when the force is balanced, the object will remain stationary or move at a uniform speed.

I believe that although you have returned many things to the physics teacher, you should still remember the most basic knowledge:

Don't be afraid, I won't really talk about these two bald formulas.

Don't be frightened by the formula:

If you want to change an object from a static state to a moving state, you need to push it. This force is called traction. The greater the traction, the faster the acceleration.

Of course, this traction should not be too small, just as the strength of a 3-year-old child is not enough to push the car.

Wait, why is this? Obviously, vehicles should move, right?

Do you remember why the small slider of high school physics doesn't move? Why does it stop when it slides to a certain distance?

Because there is something called frictional resistance.

At any time, vehicles will be subject to relatively large resistance, so that they can only stop after power failure, or have a tendency to stop while driving.

Otherwise, all cars parked on the roadside will drift around under the action of various forces like Tesla sports cars in space.

Therefore, it is very simple to move the car forward, and the traction is greater than the resistance.

And this kind of resistance, in fact, is not a simple force, but actually a group of strong men composed of four forces!

The names of these four brave men are rolling resistance, air resistance, breaking resistance and accelerating resistance.

Therefore, all kinds of skills to make electric vehicles go further are essentially to reduce one or more of these four forces.

Interestingly, these four kinds of resistance have different sizes in different environments!

We take rolling resistance as an example. The most extreme cases are as follows:

Although the tire is round, the area where the tire touches the ground is not round, but a rectangle because of gravity.

So the tire pressure warning sign on the dashboard will look like this, and the bottom is the state of the tire landing.

So in this straight-line acceleration race, thousands of horsepower cars will even make the tires wave!

If the wavy tire is not round, the rolling resistance will naturally be great.

In general, the greater the contact area between the road surface and the tire, the greater the friction and the greater the rolling resistance. Like the tower of eternity? The resistance of S with tire width of 235 is much greater than that of geometric A with tire width of 195.

-This is why the geometric endurance is excellent, but the tire width is spit out.

In addition to rolling resistance, there is also air resistance, which is actually what we usually call wind resistance.

I believe that many people have had the experience of sticking their hands out of the window when they were young, and they will be scolded by their parents. What you feel is the strength of this strong man with air resistance.

(Dangerous action, please don't imitate)

The strength of the strong man with air resistance is not only related to the wind resistance coefficient that car companies like to publicize, but also related to the area affected by wind power! Just like we usually run with our hands open in the wind, it will be more tired than normal running.

But the more important point is actually speed: every time the speed is increased, the wind resistance will increase exponentially. Double the speed and triple the air resistance!

At the speed of 80km/h, people with strong traction need to take out 60% of their own strength to overcome wind resistance.

In other words, the more the vehicle hits the wind, the faster it runs, and the stronger the air resistance.

The third kind of resistance is uphill resistance, which is essentially the same as climbing stairs. You need to overcome gravity to climb the mountain.

The last one is acceleration resistance, which is actually similar to rolling resistance.

The difference between the two is that the rolling resistance mainly exists in the rolling process of the tire, and only by rotating the tire can the vehicle move forward;

Acceleration resistance exists in the motor, half shaft, differential and other parts that rotate inside the car. Only when they turn first can they drive the tires to turn.

Another part is the work done to overcome inertia.

Is it particularly difficult to understand? Let's imagine:

You push a car at a constant speed. If you push faster, will there be more force in your hand?

At this time, the acceleration resistance is at work.

Moreover, the heavier the vehicle, the faster the acceleration and the greater the acceleration resistance.

So in essence, the daily state of the car is these three:

Greater traction acceleration;

The resistance is stronger-slower;

Traction and rolling resistance are equal.

Traction is related to the motor of the car, and we can't change it, so the only way to make the car go far is to find ways to reduce the four resistances mentioned above.

About the approximate proportion of these resistors in power consumption, the president listed a table for large and simple families:

Urban highway

highway

What is the reason for power consumption?

proportion

What is the reason for power consumption?

proportion

rolling resistance

20%

rolling resistance

25%

air resistance

5%

air resistance

60%

acceleration resistance

75%

acceleration resistance

15%

* According to different wind resistance coefficient, wind impact area, body weight, tire type, tire size, tire pressure, transmission efficiency, etc. Different models, the data will be different for reference only.

In urban roads, it is mainly to accelerate the resistance output; Under the condition of high-speed road, the main force is air resistance.

The simplest and most direct way is to weaken the air resistance first. After all, it is the chief culprit of shrinking high-speed battery life.

So Tesla model? 3. Tucki P7, BYD Korea and other models all adopt low wind resistance wheel hub covers to reduce wind resistance coefficient and improve endurance.

It is not difficult to weaken the rolling resistance. Just try to reduce the grounding area!

This can be achieved by replacing a smaller wheel hub, using a narrower tire, or using a lower rolling resistance tire with a more economical formula.

Although generally speaking, the power consumption of urban roads is lower than that of expressways, the mileage of cars driving in cities will be longer.

Therefore, the acceleration resistance that often appears in stop-and-go is also the object that needs attention.

However, there is no good way to accelerate resistance-the only way is to lose weight.

The car is not easy to reduce, so we have to start from ourselves.

If you can lose weight 10kg, then you can save electricity by reducing the acceleration resistance, and the effect is about … 0.5- 1%.

But losing weight can not only weaken acceleration resistance, but also weaken rolling resistance. The effect is almost ... 0.5- 1%.

These two items are rounded up and add up to more than ten kilometers.

Of course, if you put less garbage in the car, maybe it can be improved.

To sum up, if you want to improve your battery life, you must do the following:

By installing the hub cover, or not installing unnecessary ribbons on the car. , air resistance decreases;

Reduce the rolling resistance by reducing the grounding area and weight;

Reduce acceleration resistance by losing weight and accelerating as slowly as possible.

As long as the strength of the resistance strong man is reduced as much as possible, there is no need for such a large traction, and the endurance can naturally be improved.

So, is it true that the old driver claims that he can run 100 km more than NEDC?

Let's assume that a car with a cruising range of about 650 kilometers is probably an account:

By installing the official hub cover, increase by 3%;

When the tire pressure increases by 0.3Bar, it will increase by 5%;

By replacing the 2-inch wheel hub, including weight loss, it will be improved by 5%;

Try to lose weight again 10kg, up by 2%. ...

Theoretically, it can increase the endurance of NEDC by 650x 15%=97.5 km. Round it off, it seems that 100 km is not impossible.

However, the president seems to have found the biggest gap between himself and the old driver-weight!

Anyway, I went to lose weight.

This article comes from car home, the author of the car manufacturer, and does not represent car home's position.