A lot of people think that fast cars are safer. Because the speed can speed up the overtaking speed, and in dangerous situations, the fast car can step on the oil on the floor to get out of danger. Therefore, in recent years, we have attached great importance to zero acceleration time, and many people have taken zero acceleration time as an important reference factor when buying a car. Automakers have also keenly grasped this hobby of consumers, working zero acceleration time, and the new cars are all turbocharged and faster than each one. But honestly, I don't deny that motivation affects safety, but the increase in safety is not as great as you might think. Especially in models with turbocharged engines. Why turbocharged engines are faster We know that the engine is powered by the energy generated by the combustion of the hybrid gas. In the case of the cylinder volume is unchanged, the more gas mixture the cylinder is filled with, the more oil can be sprayed, and the greater the combustion energy, the stronger the power naturally.
The naturally aspirated engine is self-aspirated by the piston, so the maximum suction capacity does not exceed the cylinder capacity. For example, a 2.0-liter four-cylinder naturally inlet engine, if the single cylinder capacity is 0.5 liters, the maximum intake capacity per cylinder does not exceed 0.5 liters. Moreover, the output torque of the naturally aspirated engine has a great relationship with the speed, as the speed rises from the idle speed, the torque gradually increases, and the speed continues to rise after reaching the maximum torque speed, but the torque begins to decrease. For example, a naturally aspirated engine known as the maximum torque of 200 Nm, in fact, this 200 Nm is not always available, and can only output such a large torque when the maximum torque speed is reached.
Turbocharged engines, on the other hand, are different. The supercharger first pressurizes the air to increase the pressure. In this way, the piston does not need to inhale itself when inhaling. When the intake valve is opened, high-pressure air will enter the cylinder on its own, so more air will enter the cylinder. For example, in a 2.0-liter four-cylinder turbocharged engine, if the single cylinder capacity is 0.5 liters and the supercharger is working at full capacity, the actual intake of the cylinder may reach 0.8 liters. Moreover, the supercharger can maintain the maximum intake of the cylinder in a wide speed range, so the turbocharged engine can not only output torque, but also can output the maximum torque in a wide speed range, and the torque becomes larger, the output becomes higher, and the high speed is taken for granted In the process of acceleration, the power of the turbocharged engine is not incidental
Turbocharged engines accelerate to zero speed, but that doesn't mean it always has an advantage. Because motivation isn't immediately available. The supercharger is driven by exhaust gases, so enough exhaust gases are needed to provide enough boosting to reach maximum torque, a process that takes time, so the power response of the turbocharged engine slows down by half a beat. This is what people often call turbocharging. For example, in a 2.0-litre turbocharged engine, the supercharger's exhaust gas bypass valve opens when the throttle is gently pressed down to start, and the exhaust gas is discharged directly, no longer driving the supercharger. At this time, the demand for power is small, and the demand can be met without supercharging, so the engine control computer does not start the supercharger. At this point, the engine is equivalent to a naturally aspirated engine. Even if the throttle is pressed in 1st gear, the supercharger will not start even if the engine speed reaches 3000 rpm.
If you press the throttle to the bottom at the start, the engine control computer will know that power is needed. At this point, the exhaust gas bypass valve is instantaneously closed so that all exhaust gases drive the supercharger. As the engine speed increases, the amount of exhaust gas increases, and the amount of exhaust gas can make the supercharger reach the maximum booster pressure. At this time, the power of the engine began to explode. During the zero-boost process, the supercharger does not enter the state at the beginning of the start. At this time, due to the poor power of the car, many supercharged cars lag behind naturally aspirated cars from scratch. However, after the supercharger began to work, the turbo car began to overtake instead. Moreover, the throttle is pressed to the end in the acceleration, the supercharger is always working at full strength, and the shortcomings of a slightly slower start can be compensated by the powerful power in the later stage. Therefore, the overall high speed has its advantages. However, in reality, driving a social road is not faster than zero. For example, some people say that high-speeding helps to escape the danger zone, but as I said before, the turbocharged supercharger has not yet entered the state in the initial stage, so its power is not good. At this point, achieving a "rapid escape from the danger zone" does not seem so easy.
In addition to overtaking, if you drive at a uniform speed before overtaking, the speed is not very high, and the supercharger is almost not working. At this point, 2.0T is actually no different from 2.0's own attraction. At this time, you need to overtake. Press down on the throttle, downshift the transmission, increase engine speed, and turn off turbine exhaust bypass valves. The supercharger increases the speed and begins to prepare for the boost, and the engine fully outputs the maximum power after the boost pressure is maximized, but this process takes time, and this time may miss the best time to overtake. So turbocharged cars are simpler and more powerful than starting-up acceleration in place. Because the surge in power after the turbine starts, it can make up for the shortcomings at the beginning, and the overall performance is good. However, if the driving situation is complicated, there may not be enough distance and time to prepare for power. At this time, the benefits of pressurization are not fully reflected. Turbocharging is easy to give blind confidence to owners who do not understand
Some car owners usually drive on the road and like to accelerate suddenly when the road conditions are good, but the road situation is not complicated at that time, there is enough time to experience the power, it is easy to ignore the turbine engine, and feel the deeper power. For a long time, it is easy to form blind self-confidence, for example, even when there is no condition for transcendence, it is necessary to rely on motivation to barely surpass. If the turbocharger is in full operation, it may really be fine. One foot on the throttle can really be surpassed. However, if the supercharger does not work before overtaking, if you want to force overtaking, the turbo deceleration is particularly obvious. When you turn, step on the accelerator and start overtaking, the opposite car looks like it is approaching, but the power peak has not yet appeared. When the sense of growth of expectation appears, your mood will bottom out. Some drivers keep a slightly lower profile and give up overtaking, and some drivers boldly overtake, but then it will increase the risk. Therefore, the turbocharged engine is said to be very powerful, but its characteristics must be clarified, and the power characteristics of the engine at different speeds, gears, and engine speeds must be mastered, and the advantages of the engine must be fully utilized. Too much belief in zero acceleration time is easy to go the wrong way.