mathematical modeling

Reward score: 20-9 days, 3 hours before the end of the question.

mathematical modeling

Save fuel while driving.

With the development of global economy, the demand for energy is increasing. Some experts predict that according to the current mining speed, oil mines will be exhausted in a few decades, and in 2007, the international crude oil futures price soared to more than $ 1.4 per barrel. Although it has declined recently, the energy problem is still one of the key issues that the international community generally pays attention to. While developing new energy, how to effectively save energy and improve energy utilization efficiency has become the focus of public opinion. China clearly regards energy conservation and emission reduction as one of the main tasks of the 11th Five-Year Plan, which also shows that China leaders attach great importance to energy issues.

In developed countries such as Europe and America, automobiles are almost a necessity in daily life, and the automobile industry is also one of the national pillar industries. In recent years, with the rapid development of China's economy, cars have gradually entered thousands of households and entered our lives. There are already hundreds of millions of cars in China. According to preliminary statistics, the average monthly gasoline consumption of each car in China is generally above 654.38+10,000 yuan. According to the calculation of 5 yuan/liter, the annual gasoline consumption of automobiles in China reaches several hundred million tons. Therefore, on the one hand, the state encourages people to buy and use small-displacement cars that are more fuel-efficient. On the other hand, good and correct driving habits can also greatly reduce fuel consumption. For example, some small-displacement vehicles can consume less than 5 liters per 100 kilometers, and some large-displacement vehicles can reach 10 liters; In addition, the fuel consumption of the same car is as high as 10 liter after some drivers have driven it, but some experienced drivers can achieve less than 8 liters, saving 20%. If everyone can drive correctly and reasonably, then the amount of gasoline saved every year is really a lot!

So, how to drive to minimize fuel consumption? The debate on this issue has never stopped ... Lao Wang said that when the speed reaches 80~ 120 km/h, release the throttle, put it in neutral and let the car slide by itself. Little flower oil is used at this time. After the speed drops, re-shift to the fifth gear, slam on the accelerator, and then shift to neutral. If this is repeated, it will definitely save fuel, especially on the expressway. Lao Li doesn't think so. He said to keep the fifth gear, don't change the neutral position. When the speed is relatively high, we just need to release the throttle. Although the car was in gear at this time, all cars now have microcomputer control chips. When the speed is very high, even if the gear is engaged, the nozzle will stop spraying, that is, the fuel consumption is zero. But there is no doubt that although it doesn't consume oil, as long as you don't step on the accelerator, the speed will drop quickly, so Lao Wang still thinks his method is more fuel-efficient. However, Lao Li also suggested that I can slide in the fifth gear when going downhill, and the speed can be maintained, so that he is safe and fuel-efficient.

Please establish a reasonable mathematical model according to the internal power structure of the car and Guangzhou Honda Sidi 1.5 liter manual gearbox to answer the following questions:

1, Lao Wang's method or Lao Li's method, who is more fuel-efficient on a level road?

2. What if it is downhill or uphill?

3. What are the better ways to save fuel when driving?

Write a short article for a car magazine, and give some suggestions to drivers on how to drive reasonably and how to save fuel safely.