What harm will low-grade and high-speed driving habits do to cars?

High-end low speed

It has been discussed for too long which of these two driving habits is more costly and more harmful. The standard answer to this question is not difficult to analyze, but why do many people worry about this question? Why not choose a reasonable driving mode that matches the correct speed and speed? The core phrases here are as follows. Whether low-level classicism uses oil and how to save oil. To solve this problem, it is necessary to understand the working principle of internal combustion engine and its matching relationship with gearbox.

Driving skills: low-level high-speed, high-end low-speed, how to refuel and hurt the car? Relationship between fuel consumption and speed

Fuel-powered vehicles are heated by internal combustion engines, which generate heat by burning fuel and convert heat into kinetic energy through mechanical structure. This engine involves three knowledge points. If you master these knowledge points, you will no longer be fascinated by fuel consumption.

1: calorific value of fuel. Take gasoline as an example, the calorific value reaches 44,000 kilojoules per kilogram. The concept of calorific value is the quantitative value of the total heat generated by fuel combustion, which is a certain data set. Internal combustion engine is the torque converted by "constant calorific value" (heat). At least at a certain speed, the higher the calorific value, the greater the torque. Then, as long as the calorific value is constant, the torque is in a certain constant speed state. What is the relationship between torque and car power?

2. The concept of horsepower. The concept of meter horsepower unit is that 1PS moves a 75kg object at the speed of 1 sec1m. So as long as the weight of the object remains the same, the greater the horsepower, the faster the moving speed. The maintenance quality (weight) of a car is constant, so the greater the horsepower output per unit time, the faster the vehicle accelerates or speeds up. What car commuting needs is "efficient commuting". The 3354 car needs horsepower, and the calculation formula of horsepower is "(rotating torque) 1.36=PS".

3. The relationship between speed, torque and horsepower. Referring to the formula listed in the second section, the key factors to determine horsepower (PS) are torque and speed, which are complementary "multiplication" relations. As long as the engine speed is constant, the torque is determined according to the calorific value of fuel, which is equivalent to horsepower. As long as the calorific value is constant, the speed determines the output horsepower. Why is the higher the engine speed, the greater the torque? Do you know the actual control of the 3354 accelerator pedal?

Solar terms and performance fees

The accelerator pedal actually controls the throttle of the engine (the "throat" of the intake system of the internal combustion engine), not the opening of the oil system or the opening (fuel injection). The stroke depth of the throttle determines the opening of the throttle. The higher the opening, the more air the engine enters. According to the air intake, ECU's driving computer uses the theoretical performance fee 14.7: 1 to analyze the injection quantity. The popular description is that the more air the engine takes in, the greater the injection quantity, the same increase in the two total quantities, and the torque and speed will increase! Driving skills: low-level high-speed, high-end low-speed, how to refuel and hurt the car?

Knowledge point: The calorific value of fuel is fixed. Want to improve the engine output torque can only rely on the increase of speed. Only when the rotational speed increases, the rotational speed of inflow and injection will increase, and the result is not the first step. The real first step is to increase the throttle opening, air intake and fuel injection. After that, as more fuel with fixed calorific value is burned, more heat is generated, which pushes the piston connecting rod to move the crankshaft with greater energy and faster speed.

Abstract: With the increase of rotating speed, the gas quantity and injection quantity increase continuously. Throttle throttle adjustment is the first stage, torque rise is the basis of speed rise, and speed rise is the way of torque rise. By analyzing this point, we can explain whether the "low-grade high-speed" consumes a lot of oil. The answer is of course oil. Because the higher the speed, the greater the injection quantity, the higher the efficiency and enthusiasm of the engine rising in the high speed range, and the injection quantity will continue to increase. But this way of driving makes people feel very happy. The function of a car is not only a proxy tool, but also a toy.

Is there any injury to the car: driving at a low speed will not hurt the car for most car users. The internal combustion engine is inevitably worn in operation, but this kind of machine has a "healthy speed range" under the lubrication of high-grade oil. The healthy speed range of most gasoline engines is below 4000 rpm, and the speed range with serious wear is between 5000 and 7000 rpm. But most car users think that 3000 rpm is high speed. Is there anything to worry about?

High-end and low speed: This driving mode is harmful to the car, but not to the engine, but to the flywheel and gearbox. The high position of the gearbox is used to increase the speed and the low position is used to increase the power (power). The high-end transmission ratio can extend the low-speed rotation speed of the engine flywheel to the high-speed rotation speed of the wheel through the transmission ratio. At this time, the horsepower output by the machine is actually very low, but the driving resistance of the vehicle at high and low speeds is great. These resistances are reversely transmitted to the gearbox and the engine through the wheels, and the engine outputs enough horsepower to overcome the resistance without turning off the lights, but the reverse resistance and the power output by the flywheel are high-intensity confrontation. In other words, the flywheel friction plate of the clutch and the gear set of the transmission are subject to greater wear.

To sum up, advanced low-speed cars can save fuel. Because the engine speed is very low at this time, the injection quantity is actually very small, but this driving habit is 100% injury. Low-level high-speed driving habits are expensive, but if you like radical driving style, there is nothing wrong with it. But the most scientific driving habit is to start quickly at a low level, and then cruise at a reasonable speed and a reasonable gear, neither too high nor too low. (temperature line)