I don’t know if there are any drivers who dare to confidently say: In terms of automobiles, I’m omniscient and omniscient, and I’m an “expert†in the auto industry. There should be no such person exists! Even the most senior automotive repair specialists and automotive professors may have problems that they can't answer, not to mention only the users of the car, our vast driver friends. The following are some of the misconceptions listed by some netizens on the automobile. Let's take a look at what everyone says.
The higher the speed the more oil
This may be the most serious misunderstanding of the people of the country and it is rarely corrected. The average efficiency of a typical domestic gasoline engine under high load conditions ranges from 2500 to 3200 rpm. The Chinese people drive the daily driving of the sedan manually, and the 2,000 conversion gear is also appropriate, taking into account the fuel consumption and noise. However, even if the situation requires rapid acceleration, it often shifts to 2,000 rpm, resulting in an inefficient range after an upshift to 2,000 rpm. However, because the power is too bad to be replenished, the correct shift should be 3,000 rpm. Afterwards shifting gears, when the speed drops to 2300-2400 rpm, it will save fuel.
The greater the displacement, the more oil
In fact, the high-speed overtaking large displacement can maintain the fuel efficiency in the efficient range. Small displacement only has an advantage when it is at idle speed and low speed. In general, the same engine technology, moderate displacement is the most fuel-efficient. This moderate displacement is 1.8-2.0 for compact cars (some models 1.5 and 1.6 may also be good, this is a new situation that has emerged in some new cars for 14 years, but also the technology has improved, the new 1.6 and 1.5 engine The power has reached the level of the previous 1.8 engine), 2.0-2.5 for mid-range cars. Turbo can be smaller than this. Too small a displacement actually causes the engine to work in excess of the optimal operating conditions many times, but it is even more costly. The first thing that has the biggest impact on the fuel consumption of traditional power cars is the vehicle weight. The second is the aerodynamic characteristics. For example, a high-powered SUV will consume oil, and the third is the gearbox and engine technology level, and finally the displacement.
Sometimes, user data does reflect the fact that on a compact car, the 1.6 displacement is 1.8- and 2.0-efficient, and the medium-range 2.0-2.4 is 2.5. But many times this is actually because the driver of the small-displacement engine is driving. The car uses less power, even if the power is not enough, because of fuel consumption and noise reasons are not willing to throttle.
A small class of cars can save more fuel than a big one.
Smaller-class cars are generally lighter than fresher-class cars. Under low-speed operation, because the main resistance is the rolling resistance that is greatly affected by the weight of the car, there are indeed fuel consumption advantages. However, small-class cars often have gearboxes, and the engine technology is relatively low. In addition, because the vehicle body is short and space must be ensured, the most streamlined design cannot be made. The high wind speed in medium- and high-speed driving is also not conducive to fuel economy. At the same time, the engine configuration of the car was too low, and the small horse-drawn carts caused an increase in fuel consumption. The above situation is particularly evident between small cars and compact cars. In fact, the current compact car is generally not much more fuel efficient than a small car. Even in a city with a smaller car advantage, some compact cars are still smaller than some small cars. To be more fuel efficient
Manual transmission saves fuel than automatic transmission
This sentence is correct in the early stages of automatic transmission development. Compared with 4AT, the traditional 5MT has more gears, and the speed is more easily controlled in the high efficiency range. With no loss caused by the torque converter, it is generally more fuel-efficient. However, modern automatic transmissions can already achieve even more fuel economy than manual transmissions by improving shift programs, increasing gear positions, and the like. Because CVT can continuously change the transmission ratio, the double-clutch gearbox can basically save more fuel than the manual transmission because of very short shift intervals and high transmission efficiency. In addition, even a manual transmission with a lower fuel consumption principle may be more costly than a automatic transmission in a novice who has poor grasp of clutch and shift timing.
Turbocharging is more fuel efficient than naturally aspirated engines
This sentence is not entirely wrong. For high-end cars, if you want to pursue additional power, you can generally save more fuel than increasing the displacement and number of cylinders without changing the displacement but increasing the turbine. Its principle is that when you don't need so much power, the engine is an ordinary moderate-displacement naturally-aspirated engine. There is no large-displacement fuel, and the weight of the engine can be reduced. The weight of the engine itself is still quite obvious.
The above is the mistaken understanding of automobile fuel consumption by everyone, and then the small series will give you a wrong understanding of vehicle safety. For more details, please continue to pay attention to Xiaobian.
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