［Auto Repair Knowledge］Four factors of driving fuel consumption

First, advancedcarTechnical performance is crucial to fuel consumption. The advancement of automobile technology can be said to be changing with each passing day. If you compare the fuel consumption of current cars and past models, you can immediately see the huge effect of automobile technology progress in reducing fuel consumption. Several key technologies related to fuel consumption include three main contents: One is to work hard to reduce the vehicle's own weight. The relationship between vehicle weight and fuel consumption is directly proportional. It is said that every 10% reduction in vehicle weight will reduce fuel consumption by several percentage points. The second is to improve car styling. If the body drag coefficient is small, the fuel consumption will be significantly reduced. The relationship between the two is also proportional. The third is to maximize the thermal efficiency of the engine. At present, the thermal efficiency of general gasoline engines (that is, the ratio of fuel conversion into useful work) has reached more than 30%, while diesel engines have exceeded 40%. This is the main reason why diesel engines have lower fuel consumption than gasoline engines. Experts told us that to evaluate the technical level of an engine, there are two important indicators, one is the ratio of power to weight of the car, and the other is the power per liter of the engine. The ratio of engine power to displacement is called liter power, which indicates how much power the engine can emit per liter of volume. The higher the ratio, the more advanced the engine technology. In our test report, Shanghai Passat performed best, followed by Audi A6 and Accord. The Buick with the largest displacement seems to have suffered a bit in this ratio, ranking fourth. Second, good vehicle conditions are the foundation of fuel economy To be honest, many of our "amateur drivers" take great care of vehicles. However, due to the lack of car knowledge, many people's caring for the car is limited to keeping it clean, while other aspects are often ignored. In fact, scientific maintenance can make the car achieve the goal of fuel saving. For example, wheel bearings should be oiled on time, but some car owners don’t understand it until the bearings are worn out.Wheel bearings are short of oil, friction will increase, and fuel consumption will increase. Some carsbrakeDo not return,Brake padsWhen driving in friction with the brake drum, the fuel consumption will naturally increase, and the wheel alignment will be abnormal, resulting intireAbnormal wear is also a reason for the increase in fuel consumption. engineIgnition systemAbnormalities also have a great impact on fuel consumption, such as inaccurate ignition time,High-voltage lineLeakage,Spark plugCarbon deposits cause weak ignition, etc., which will reduce engine combustion efficiency and increase fuel consumption. Third, incorrect driving habits will cause fuel consumption to increase exponentially With the advent of the automobile age, there are more and more non-professional drivers in our country, which will inevitably cause a big problem; incorrect driving habits lead to increased vehicle fuel consumption. At the same time, experts pointed out that the impact on large-displacement vehicles is even greater. Experts have summarized several bad driving habits that affect fuel consumption: 1. The driving habit of grabbing when you see it. In daily driving, especially when the traffic is not smooth, when waiting for a red light, or changing lanes, this phenomenon is common: As soon as the adjacent lane becomes empty, a car here suddenly accelerates and squeezes past. Had to step on the brakes. After a while, when there was time in the lane, he squeezed back as soon as he stepped on the accelerator. Waiting for a signal, he can speed up and stop four or five times. This looks very chic, very awe-inspiring, and very lively, but at the cost of greatly increasing fuel consumption. Experts have done an accelerated fuel consumption test: after letting the vehicle drive at a constant speed into the test section, the test driver stepped the accelerator to the end, and after completing the prescribed distance, they found that the fuel consumption increased by 2 to 3 times compared with the constant speed driving. 2. The habit of low gear, high speed and long distance driving This mostly happens to novice drivers, but it also often happens to people who drive easily. Long-distance high-speed driving in third gear increases fuel consumption by 10% compared to normal driving in fourth gear, and if second gear is used instead of third gear, fuel consumption will increase. Hyundai cars have regulations for shifting gears, and the engineRotating speedOnly after reaching the specified number of revolutions can the gear be increased, which is from the perspective of protecting the engine. However, some people go to extremes and do not increase the gear until the engine revolutions exceed the prescribed limit. This will also cause fuel waste. Experts believe that low gears and high speeds will definitely cost gas. High gear and low speed will definitely save fuel. 3. Unnecessary high-speed driving Almost all countries in the world have restrictions on the maximum speed on ordinary roads. In the United States, the maximum speed is 55 miles (88.5 kilometers), and roads with good road conditions are relaxed to 65 miles (105 kilometers). Therefore, American cars and models aimed at entering the American market are designed to have the lowest fuel consumption at 90 kilometers. This is what we call economic speed. Any car has an economical speed. When driving at this speed, it is the most fuel-efficient. When the speed is lower or higher than this speed, the fuel consumption will increase. After a certain speed is exceeded, the fuel consumption will increase significantly. The speed limit of highways in my country is 110 kilometers, and some sections are allowed to reach 120 kilometers. But many people will greatly exceed this speed when driving on the highway, which is neither safe nor economical. For example, the fuel consumption of the Buick GS is 6.47 liters at a speed of 70 kilometers per hour; when the speed reaches 120 kilometers per hour, the fuel consumption rises to 9.46 liters; if it reaches its maximum speed of 200 kilometers, the fuel consumption will increase significantly. One thing to note is that bad driving habits have a greater impact on the fuel consumption of large-displacement vehicles, because large-displacement vehicles have large power reserves, strong acceleration and speeding capabilities, and drivers dare to "act" when they have time. I want to overtake if I have a drill or a car. The small displacement car has a small power reserve, low acceleration and speeding ability, and there is no interest in driving in a crowded, ultra-high-speed driving. 4. Driving road conditions are an important factor affecting fuel consumption Automobiles have their own "economic speed", and are generally designed to be within an area of ​​70 to 90 kilometers. If within this speed, it is possible to drive in the city unimpeded, then the fuel consumption should be closer to the test value in the test in the standard test field. But it is a pity that there are very few large cities in our country that have such unimpeded traffic. When "cars do not run as fast as bicycles", the increase in fuel consumption is great. Related: ·Ten Steps to Car Maintenance in Winter[汽车修理知识]
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