I make a popular science video and all the emperors learn from it!

[Continue to popularize science.] 】

[2. Modern means of transportation. 】

[9. Motorcycles and electric vehicles. 】

[Motorcycles, two-wheeled or three-wheeled vehicles driven by gasoline engines and steering by handlebars, are light and flexible, fast-moving, widely used for patrolling, passenger and cargo transportation, etc., and are also used as sports equipment. 】

[In terms of general direction, motorcycles are divided into street bikes, road racing motorcycles, off-road motorcycles, cruising cars, station wagons, etc. 】

【Development History:】

[In 1885, the German Gottlieber Daimler installed an engine into a frame machine, and the world's first motorcycle was born. 】

[Motorcycle sports related to motorcycles is a kind of military sports, which is a kind of competitive sport with motorcycles as equipment, divided into two types of two-wheeled and three-wheeled models, and each model is divided into several levels according to the working capacity of the engine cylinder. 】

[According to the form of competition, it can be divided into cross-country race, multi-day race, road race, track race and travel race. 】

[Rankings are based on driving speed or driving skills.] 】

Since then, the development of motorcycles has undergone more than 100 years of vicissitudes. 】

[Limited to more than 100 years ago, the gasoline engine at that time was still in a low-level and naïve state, and the vehicle manufacturing at that time was still in the stage of horse-drawn carriage technology, and the original motorcycle and the modern motorcycle were very different in appearance, structure and performance. The frame of the original motorcycle was made of wood. 】

【......】

[After the 70s of the 20th century, the production of motorcycles has adopted electronic ignition technology, electric start, disc brakes, streamlined body guards, etc., as well as exhaust purification technology in the 90s, ABS anti-lock braking device, etc., making motorcycles become advanced motor vehicles with beautiful shape, superior performance, easy to use, flexible and fast, and become one of the important symbols of contemporary earth civilization. 】

[In particular, large-displacement luxury motorcycles have transplanted today's advanced automobile technology to motorcycles, so that motorcycles have reached the realm of perfection. 】

[The development of motorcycles has entered the fourth stage - the heyday. 】

【Working Principle:】

[Take the working principle of four-stroke engine and two-stroke engine as an example:]

[The four-stroke engine has a wide range of use, and the four-stroke engine means that the piston ignition of the cylinder every four reciprocating movements. 】

[The specific working principle is as follows:]

[1. Air intake: At this time, the intake valve opens, the piston descends, and the mixture of gasoline and air is sucked into the cylinder. 】

[2. Compression: At this time, the intake valve and exhaust valve are closed at the same time, the piston goes up, and the mixture is compressed. 】

[3. Combustion: When the mixer is compressed to the minimum, the spark plug jumps to ignite the mixture, and the pressure generated by the combustion pushes the piston down and drives the crankshaft to rotate. 】

[4. Exhaust: When the piston goes down to the lowest point, the exhaust valve opens, the exhaust gas is discharged, and the piston continues to go up to discharge the excess exhaust gas. 】

【......】

[Due to the limited petroleum resources, in recent years, we have advocated "green environmental protection ~ protection", and electric vehicles with similar functions to motorcycles have been greatly developed. 】

[Battery car, also known as "electric vehicle", is a pure electric motor vehicle driven by a battery (battery) and driven by an electric motor (DC, AC, series excitation, and other excitation). 】

[In recent years, it has been very widely popularized in China. 】

[The main purpose of the electric sightseeing car is to carry passengers in parks, scenic spots, leisure resorts, universities, hospitals, golf courses, real estate companies and other places, the main purpose of the electric patrol car is to carry out security patrols in station squares and crowded places, and the main use of electric trucks is in factories, ports, terminals, logistics warehouses, etc. 】

[The main purpose of the electric sanitation vehicle is to clean the site, clean the road, transfer garbage, etc.] 】

[The service life of the battery car is generally 8 to 12 years, and the service life of the battery is generally 1-4 (depending on the use and maintenance)]

【Brief History of Development:】

[The development history of battery cars: originated in the 80s of the 19th century, used as private cars, trucks and urban public transport vehicles. 】

[The low speed and limited charging range of battery cars are not disadvantages, but their advantages such as no noise and low maintenance costs make them popular. 】

[Before 1920, battery cars had been competing with gasoline cars, and later battery cars began to decrease, because electric starters made gasoline-powered cars more attractive, and mass production made gasoline cars cheaper.] 】

[Since the 70s, there has been a resurgence of interest in electric vehicles, especially due to the lack of dependence on foreign oil and environmental issues, which have led to repeated improvements in the speed and range of battery cars. 】

[With the continuous attention of automobile energy and pollution problems, the continuous improvement of battery car technology and the continuous expansion of use, the future development of battery cars has bright prospects. 】

【Development Status:】

[The development of the 21st century can be described as the era of "calling for green environmental protection", which not only requires people to pay attention to energy conservation, but more importantly, requires people to pay more attention to the living environment and green environmental protection, so as to achieve sustainable social development. 】

Electric vehicles are the only motor vehicles in the world that can achieve zero emissions. 】

[Due to the requirements of environmental protection, coupled with the development of new materials and new technologies, electric vehicles have entered a period of rapid development. 】

[China's oil resources are relatively poor, and fuel and exhaust emissions are the main sources of air pollution in large and medium-sized cities in the future. 】

[To this end, the development of electric vehicles in Huaxia is undoubtedly an inevitable trend in the future development, and it is also in line with the needs of the green environmental protection revolution. 】

[Because electric vehicles are environmentally friendly and low energy consumption, it is the best transportation product for green environmental protection and air pollution, how to provide a good ecological environment for the masses of people, so that they are physically and mentally healthy and have a good living environment, the development of the electric vehicle industry is to adapt to this trend, and it is a tool for sustainable social development. 】

As a means of green transportation, electric vehicles will bring great changes to human society in the 21st century. 】

[In line with the current trend of international scientific and technological development, electric vehicles as the entry point for China to enter the 21st century automobile industry is not only a strategic choice to realize the leapfrog development of China's automobile industry, but also an important choice for the sustainable development of the automobile industry in the summer. 】

【Four major accessories for electric vehicles:】

[The main core components of motors, batteries (batteries), controllers, and chargers. 】

【......】

"Well, the feeling is that cars have replaced horse-drawn carriages, and motorcycles and electric cars have replaced horses. "

"If you die of laughter, what is the use of the horses of the future?"

"It's not completely useless, you can feed it to the wolves. "

"What's the use of feeding the wolves?"

“..."

Many people quarreled directly.

Finally, the caliber is unanimous.

In later generations, horses and oxen were of little use.

Maybe you can eat meat.

But they don't know if future generations can eat beef, after all, their dynasty can't just kill cows.

Qin Dynasty.

After reading it, Ying Zheng muttered: "Huaxia's oil reserves are not enough. "

"Do you want to go green?"

"It's just that there are not enough things to look at!"

He was going to laugh angrily.

In China, where there is a lot of land and resources, there are not enough things!?

What makes Yingzheng regret is that he doesn't know where there is more oil, otherwise he will specify that he will occupy the place first.

Tang dynasty.

Li Shimin was a little surprised.

After the Qing Dynasty, the country initially lagged behind, but it was able to catch up and come back in front of other parties (King Zhao).

This was the case with the previous trains.

The same is true for today's automobiles and motorcycles.

"Electricity..."

"What is electricity, is it lightning in the sky?" (read violent novels, go to Feilu Novel Network!)

Li Shimin muttered to himself.

The Tang Dynasty didn't have the strength to build a generator at the moment, so he naturally didn't know what electricity was.

Ming dynasty.

Zhu Yuanzhang looked excited.

"Yes, if Huaxia can be monolithic internally, it will definitely not be weak to other national teams. "

Although he did not know who established the regime after the Qing Dynasty.

But instinctively thought it was the Han Chinese who overthrew Qing rule.

Only then did Huaxia slowly stand on top of the world again!

Zhu Yuanzhang took a deep breath, "Write them all down, even if these techniques are not used in the Ming Dynasty, they can be used by future dynasties!"

"Let us know in advance what will happen in advance. "

"We're not going to let it happen again!"

"Huaxia can only be the first, and must be the first!"

Zhu Yuanzhang's momentum infected other officials, and the officials wrote hard with tears in their eyes! .