Every car's engine has an optimal working range. As long as it is within this range, the utilization rate of the engine is relatively high, the energy waste is relatively small, the power is still relatively good, and the fuel consumption is naturally low.
This is like saying: at different times, sometimes our work is spiritual, that is, good and efficient; Sometimes you just feel sleepy. No matter what you do, you just drag your feet and it doesn't work. The best economic range of most cars is around 2500 ~ 3000 rpm, so try to shift gears in this speed range when accelerating.
Look at the general characteristic curve of the engine
The reason why it is better to say 2500 to 3000 rpm is from the universal characteristic curve of the engine. Shifting around 2500 ~ 3000 rpm is more fuel efficient. Beijing Jiaotong University has a paper "Research on Modeling of General Characteristic Curve Based on Modern Optimization Method".
The general characteristic curve is used to comprehensively evaluate the engine performance characteristics, which is a combination of curves that can intuitively and comprehensively represent the different performances of automobile engines under different working conditions.
I don't remember, anyway, it was about 2500 to 3000 rpm, according to experts and data. This braking fuel consumption rate refers to the fuel consumption of 1h when the engine works at 1kW. When the engine works at the highest efficiency, that is, when the fuel consumption rate is the lowest, it is the best speed range for us to shift gears.
It's a bit like electricity: 1kW work 1h, so it's called 1kW? H, right? 1 kwh. The cheapest time for electricity is when we can turn on the air conditioner and use electricity vigorously, right?
Although the specific values of different types of engines are definitely different, according to the universal characteristic curve, they are basically near the interval. For example: Volkswagen "Ji Shen", the third generation EA888, the lowest braking fuel consumption rate appears at 2500 ~ 3000 rpm under medium and high load.
Toyota's small displacement 8NR engine, the lowest point is also around 2500 rpm. Honda's "Ji Shen" L 15B, in order to lower the daily fuel consumption performance, the lowest area appeared earlier, about 1500 to 2700 rpm.
Good power output can be maintained.
It is not recommended to shift gears beyond this speed because the fuel consumption is relatively high; It is not recommended to shift gears below this speed range unless the fuel consumption performance is not very good and the engine power output is not enough. This is mainly because every shift, in fact, the gearbox is working at a smaller transmission ratio, which increases the upper speed limit of the car, but also reduces the output torque of the engine.
/kloc-when shifting gears after 0/000 rpm, the car will obviously feel the lack of power when driving, and the manual gear will sometimes shake a little, or it is our vernacular "drag".
Those who drive the automatic gear can shift to the control computer.
Automatic gear is easier to operate than manual gear, because one of the calibration logic of powertrain is to find the best shift strategy. Jilin University has a paper "Research on Matching, Calibration and Optimization of Gasoline Engine Powertrain System". The so-called calibration refers to the values of three-dimensional, two-dimensional and one-dimensional parameters in the electronic control unit.
Through specific experiments, we can find the best control quantity, so as to achieve the best performance of the controlled object itself or complete a specific function according to the design requirements.
It is best to shift gears around 2500 ~ 3000 rpm.
Generally speaking, in order to ensure the balance between power and economy, it is not good to shift gears too early or too late. Too early, not dynamic; It's too late. It's too expensive. It is best to keep the gear shift at about 2500 ~ 3000 rpm each time.
Will stepping on the red line of the tachometer hurt the car?
A friend said, "I just like the feeling of speeding up." I just step on the red line and don't shift gears. " Well, when I get up, I just like to step on the highway or even the red line with one foot. "