What do the "T" and "L" at the rear of the car mean respectively?

"t" stands for "turbocharged engine"

"T" is the initials of English Turbo, which stands for TurboBoost.

Turbocharging is a method to supercharge the internal combustion engine by using the exhaust gas of the internal combustion engine to drive the exhaust gas turbocharger.

To put it bluntly, it's like driving a blower with the exhaust gas from a car, and this blower can let the car engine enter more air.

According to the research in Jilin University's master thesis, 1.8 liter turbocharged direct injection gasoline engine performance optimization research, it is shown that the use of turbocharger in the engine can increase the intake pressure, thus increasing the air entering the cylinder, improving the engine power and torque, and generally increasing the engine power by 50% to 80%.

The specific principle is that when the turbine works, the pressure and density of air increase at the same time, and more fuel can be burned, thus increasing the output power of the engine.

If you still don't understand, imagine that this is like installing a blower for a suction stove in the countryside. Initially, air is usually inhaled and burned. Now add a blower to blow, think about the effect, and the roaring fire will come up. Now you will understand.

Generally speaking, if you see "Turbo" or "T" at the rear of a car, it means that the car uses a turbocharged engine.

"L" stands for "naturally aspirated engine"

The "L" at the rear actually stands for "naturally aspirated engine".

In fact, the English word for natural inhalation is usually spirated, but instead of NA, the displacement unit L (liter) is used to represent natural inhalation.

For example, 1.4L at the back of the car means that the displacement is 1.4L, because there is no letter t, which can be regarded as the obvious difference between natural aspiration and turbocharging.

After talking about turbocharged engines, "natural inhalation" is easy to understand. It refers to a form in which atmospheric pressure forces air into the combustion chamber without any supercharger.

In layman's terms, it is like dry air suction when there is no blower in rural areas. At this time, it is natural inhalation, that is, the atmospheric pressure we mentioned above pushes the air.

Why are most new cars turbocharged now?

Looking at the current new car market, there are very few car brands that still insist on natural inhalation. Why are most new cars turbocharged instead of naturally aspirated?

The main reason is that, like Europe, China's tax system is based on automobile emissions, which tends to encourage the development of small emissions.

Small displacement vehicles pay less taxes.

Of course, the automobile consumption tax is paid by automobile manufacturers, and the greater the displacement, the higher the tax rate.

For example, the price of a domestic car is 1.5 million, the displacement is 1.6L, and the consumption tax is calculated at 5%. According to the calculation formula, the payable consumption tax = total amount of car purchase (including value-added tax) ÷ 1. 1.7× tax rate.

Then before the vehicle is sold, the consumption tax of 64 10 yuan has already been generated.

This is the bare cost of the manufacturer. Of course it can be saved. If you can sell tens of thousands of cars and replace them with small-displacement cars, you can also save a lot of money.

In addition, the annual travel tax we need to pay is also higher with the greater the vehicle displacement. Think about choosing a car with a small displacement, and you can save a lot of money after a long time.

Turbocharging can make up for the power shortage of small displacement.

In addition to the tax reasons mentioned above, from a technical point of view, turbocharging can make up for the power shortage of small displacement, because turbocharging technology can increase the output power of the engine while keeping the displacement unchanged.

Turbocharging has more advantages in energy saving and emission reduction.

In addition, turbocharging has more advantages in energy saving and emission reduction. Due to turbocharging, the gas density entering the cylinder increases, the combustion is more complete, and the chemical energy utilization rate of fuel is greatly improved. Due to the full combustion of fuel, the emission of harmful gases in tail gas is reduced.

According to relevant statistics, under the same power, the emissions of turbocharged engines can be reduced by 18% to 35%, and the fuel consumption can also be reduced by about 10%.

Therefore, according to the above situation, small-displacement cars naturally become the unanimous choice of automobile manufacturers and our consumers.