Some cardmates said that before buying a car, they do not know how much their own configuration is. The economic speed of each vehicle configuration is different, so how should the speed be calculated? Here we will learn together.
â— The weight is the same. I run with him
There are many cardmates who say that when I run with other cars, the weight of the goods we pull is the same, and the speed of running is the same. Why do I waste more money than him? This involves the issue of economic speed. Because of the different configurations of vehicles, economic speed is different. If it happens that your economical speed is lower than the economic speed of the car you are following and you are running at the same speed as him, then spending money is inevitable. So how should the economic speed be calculated?
â— Look at the calculation formula for head speed
The above figure is the calculation formula of the vehicle speed. We can see how to calculate it. Ig stands for gear ratio of gearbox, io stands for drive axle main reduction ratio, drive axle reduction ratio is generally fixed, we use the common 4.11 as an example, the transmission we use Fast 12JS180TA as an example, it's the most The premium speed ratio is 0.78.
n represents the engine's output speed, r represents the tire rolling radius, the tire's rolling radius is a national standard, you can search through Baidu search, we assume that your car is loaded with 11.00R20 steel radial tire, then its rolling radius is 0.512. Substituting the formula can be calculated, when the engine is at 1500 rpm, the theoretical speed is 93km/h, changing the speed and so on will be able to know the speed at each engine speed.
In fact, to be honest, I also feel annoyed with this calculation method. Most people do not have the time to count this thing. Is there a simple way? This must have.
â— Truck home has a calculator to calculate economic speed is very simple
In order to make it easier for cardmates to calculate the speed, the Truck House made two speed calculation tools in the forum, a simple version and a professional version. They were in the tool area of ​​the tires. Usually we use a simple version of it, and its calculation method is also used this formula, but it is much simpler than this, you only need to enter the engine speed, transmission speed ratio, the main reduction ratio and the tire model point calculation It will come to fruition.
Of course, this calculation is only an ideal calculation. It does not calculate wind resistance and other factors, and the tire rolling radius is allowed to have a 5% error. Therefore, this theoretical speed is also subject to certain errors. However, with this calculator, cardmates can find their own parameters in the garage of the truck's house before buying a car. Fill in this calculator and the speed of each file can be calculated.
The professional version is refined to a variety of engine, transmission and main reduction ratio, and also need to fill in the total weight, road conditions, wind resistance coefficient and the windward area, there is a schematic diagram of the drag coefficient, there is a specific model, card friends Can choose according to their own models. Click Finish after filling in, there will be results.
After the calculation, you will know exactly how the climbing ability and power of the entire vehicle configuration are in each gear. With this simple tool, cardmates look for parameters before they buy a car to figure out how to count, so that they can drive their own vehicles based on their economic speed, save fuel and earn money for themselves.
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