The automobile engine is the power source and core part of the automobile. With the continuous upgrading of the automobile, the performance of the engine is also constantly improving. The purpose is to increase the power performance while reducing the fuel consumption and exhaust pollutants. Many advanced engine technologies, such as closed-cylinder technology. I believe that careful riders will find that there are VVT, VVT-i, VVT-W, DVVT, CVVT, etc. on the engine of their car. So what do these signs mean? Old drivers may not know, many people can't tell the difference!
These signs on the car engine are undoubtedly the signs of a certain performance of the engine, but in fact they are not very different, just like the four-wheel drive system of the car. Audi's four-wheel drive system is named Quattro, Subaru's four-wheel drive system is named DCCD, Mitsubishi's four-wheel drive system is named S-AWC, etc. These are collectively referred to as full-time four-wheel drive systems. The same is true for the engine logos mentioned above. They are collectively referred to as VVT, the variable valve timing system of the automobile engine, which is simply the valve structure of the engine.
Myth: Many people think that the engine intake is simple, especially the turbo engine with the addition of turbo equipment. Air can be seen everywhere, but gasoline is limited, so many people think that the intake of the engine is simple, but in fact, the intake of the engine is difficult. Otherwise, how can there be the above-mentioned distribution structure?
As we all know, the engine cylinder generates power by igniting and compressing gasoline and air. How much gasoline is supplied into the cylinder through the automobile fuel supply system, and how much is the air? The naturally aspirated engine enters naturally through the flow of air, but the power performance is not good. In order to solve this problem, a turbocharged engine was born. After installing a turbo-aspirated device, the power has been significantly improved. One of the two is passive. Inhale, one is active inhalation.
It can be seen from the above that air plays an important role in the power performance of the car, and the addition of the VVT of the car engine will undoubtedly bring the performance to a higher level. By controlling the working order of the engine cylinders, the intake and exhaust ports of each cylinder are opened and closed regularly to ensure that a large amount of fresh air enters the cylinder and is mixed with gasoline, so that the engine can burst into a stronger dynamic performance, so the in-cylinder The more air you get in, the better your car will perform.
The engine VVT-i, VVT-W, DVVT, CVVT and other signs are actually the valve mechanism of the engine. The so-called variable valve timing and lift technology means that the engine valve structure and valve lift can vary with the engine. The technology that changes at any time due to the change of speed and working conditions is like us humans eating at a fixed time. If it is said that it is opened in advance before the meal time, and the meal is opened in advance, it can be simply understood that the intake valve opens earlier, and In order to cope with the strenuous exercise afterwards, eat more meals, so delaying the time to stop meals is equivalent to the delayed closing of the cylinder. After knowing this, the old driver who has been driving for ten years is ashamed, and the car that has been driven for more than ten years does not know the logo, which is really ashamed.
The reason why they are different is that different car manufacturers have different understandings and practices of the variable valve timing system of the engine, so there are various phenomena that a hundred flowers contend, so there are VVT, VVT-i, VVT-W , DVVT, CVVT. Specifically, VVT refers to variable valve timing system, DVVT refers to intake and exhaust valve dual variable valve timing system, CVVT refers to continuously variable valve timing system, and VVT-i refers to Toyota's intelligent variable valve timing system. Valve timing system, VVT-iW refers to Toyota's intelligent variable valve timing system that can realize the Atkinson cycle. They have a significant auxiliary effect on the performance of the engine and the fuel consumption of the car.
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