汽车发动机转速和油耗

汽车发动机转速和油耗 Car engine speed and fuel consumption (new drivers will learn) Rely on fuel consumption to support generally, speed, speed, low oil quantity is little, high speed fuel, power output, the greater the need higher speed, the more volume of oil consumption, it is absolute. But please pay attention to; This is the output power, not the work. The difference between power and work is the concept of time. Power is the work done in the unit time, (usually in seconds) - just how much work is done in that second. Work is the drag force over the entire distance and times the distance. It is true that what is really relevant to a hundred kilometers of oil is how much work is done in a hundred kilometers, not the output of a second. So 3000 conversion block theory of fuel to power and power are all mixed up, the concept of the optimal value of the shift that instant area to understand is the fuel consumption of the whole hundred kilometers, is clearly false. I'll do it in a popular way; The amount of oil depends on the length of the journey, not the speed. The longer the journey, the more oil. This shows that the longer the work of the way, the consumption of oil, but also in hundred kilometers, for example, the work principle should be the same, but the actual not, because of the change of the external conditions (slope, wind resistance, curves, etc.), we talk about cars now out of external conditions and driving habits of its change; It is impossible for cars to get out of the way, even when they are out of the way. Sometimes fast, sometimes slow, why? I think mostly people can quickly control the throttle to suit the needs of the auto uniform, as we all know, some auto cruise control system, is to rely on constant speed sensor signal is passed to the ECU is complete, is a computer constantly amended to maintain uniform, and rely on the experience of driving are not fully ensure uniform, in many cases, people tend to be at a constant speed control with slow brake to ensure uniform. Everyone has experience; Sometimes after letting off the throttle, the car is not immediately slow down, but still so fast, even faster, over a period of time to slow down slowly, this is called "the phenomenon of excess power" on the dynamics, according to the Newton's first law F = ma, as long as there is the traction acceleration, when the inertia force is greater than the total resistance, the car does not come on when the door have accelerated in it. It slows down only slowly when the inertia force is not enough to overcome total resistance. This acceleration a is also directional, and when the inertia force is not enough to overcome the total resistance a is negative and the car is slow. The acceleration a and the magnitude of the acceleration, the total resistance of the brake is going to be very large, and the acceleration a is going to be big, and the car will stop very quickly. Car only when power just exactly equal to the total resistance, acceleration is zero, a car is uniform, but total resistance for various reasons every minute in change, people have no ability to control the throttle (power) to adapt to changes in the total resistance every minute. Visible; The high speed of the saving oil theory of the 3000 conversion block should not take full advantage of the "power surplus stage", if the road condition is not allowed, the foot is slow. So, these inertial energy can only be converted into brake pads, and the heat of this waste is the price you pay for the gas! Let's talk about constant speed; You know that the moving object is going to move at a constant velocity in a vacuum if you have the initial velocity. And we are not in a vacuum to drive, there are all kinds of resistance will be produced at any time, the car only when the traction force F is equal to the total resistance just F is uniform, will change vary a little, not speed is slowing down. Let me give you a popular example; Who has experience, a heavy rickshaw when starting the most arduous, once the car to move, automatic pull relatively easy, but if you want to the rapid heavy rickshaw for a while, slow for a while, that will be difficult. If you even stop for a walk, you have to kill the driver. The car is pulled by the engine, You're not tired, you're tired, you're tired, you're tired, you're tired, you're tired, and you're tired. So, in theory, uniform is one of the most fuel efficient, (deceleration is ultimately to stop, to the destination, no way) because acceleration not only to overcome resistance, but also to increase the car weight of moment of inertia and extra momentum, uniform just overcome resistance, therefore, the ideal operation pay a one-time kinetic energy, when it's best to accelerate the process of all is uniform, to make it natural slowing down to stop after, in this case, is to accelerate more oil, are all overcome resistance to change is in the process of oil, brake also need not, minimum fuel consumption. But is it possible? Make it natural slow to arrive before we say stop to the destination, they said the process could not always all is to overcome the resistance between the oil, because the wind is blowing, resistance increase greatly, whose feet can master the throttle FenLi not to cater to the size of the wind, who have eyes can see flat road slope, and the foot and master the throttle to a t to cater to the size of the slope? No, obviously not. In this way, the car will become slowly quickly (haven't said the change of road traffic), we said it doesn't matter to be faster, also can slide by using, but slow relies on the more loss of gasoline to speed up, now you know, fuel consumption is mainly used to overcome resistance and overcome the inertia force of gravity. Overcoming the total resistance is essential, and overcoming the inertia force is a little wrong (except for the first start and the stop-light stop). But there is no need for the middle course to rush, which is the bad habit of wasting gas. Torque and fuel consumption; For the engine, its crankshaft torsion is defined in terms of speed. Cars, for example, have to cope with a variety of road conditions that cannot be fixed. So use the gearbox to change the distance (deceleration torque), and the automatic transmission is the use of the variable distance. What is the twist? In general, the length of the torque is like the length of the lever, the longer the arm, the heavier the object that can be propped up. When the car start, acceleration, and climbing, limited to the power limit, can slow down to increase the torque, can overcome the inertia force of gravity (static inertial forces) and slope downward force component. At this point, the kinetic energy of the gas is almost lost. Therefore, low offset is large, which is good for climbing and overtaking. Also, for the torque, it is also the most fuel-efficient. Excessive torque reserve is also a kind of "power surplus phenomenon", I seemed to see who bragged about his is often low 5000 turn cruise, I don't know that he is in a couple of gear, but I know that even if the third 5000 RPM speed also want to almost 100 km/h, 4 block that is about to close to 130 km/h. The speed was driving downtown, and I thought he was a big oil king. Because the car must be rushing to stop, slowly, slowly, the engine is trying to drink the oil, the brake pads are burning furiously (energy is turning to heat energy). Time and fuel consumption; I've talked about a 1 stop and let the car run naturally. Is it the most fuel efficient to run 100 kilometers in 850 RPM? This problem out of the time and fuel consumption problem, we know 1 block doesn't come on the door, let the car idle natural run is about 4 ~ 5 km/h speed, run 100 kilometers is likely to be 24 hours a day and a night. According to the fuel consumption chart, the table shows the oil consumption of 1 ~ 2 liters per hour. According to an average of 1. 5 liters per hour of fuel consumption, 24 hours is 36 liters. In other words, 4km per hour is 36-liter. At 90 kilometers per hour, the average speed of 100 kilometers per hour is six times the standard of six liters. Obviously, for a long period of time, the engine's efficiency is low. The 90kph is the most efficient. This can also from me the engine can be seen in the three main factors figure, speed in the initial curve is very steep, (also called slope), over 1500 turn slowly and gently. The best engines can be almost straight in the 1500's. Our engine is not a horizontal line, but the slope of the curve after 2000 is not very large, and there will never be a full six fold difference. Therefore, the driving time has a lot to do with oil consumption. Long, inefficient workspaces will greatly increase fuel consumption. I don't have any of these exaggerated examples in everyday life. No one is going to run 100 kilometers in one block. But this is really the actual data. The purpose of this example is to highlight the issue of time.