Introduction of external characteristics

The engine external characteristic curve is the curve of the engine output power (torque) changing with the speed when the engine throttle opening is 100%. Its curve characteristics are: power curve and torque curve are both convex curves, but they are different. In the external characteristic curve of gasoline engine, the value of power curve is very small at low speed, but it increases rapidly with the increase of speed. When the rotational speed increases to a certain range, the power growth rate slows down, then decreases until it reaches the maximum value, although the rotational speed will continue to increase at this time.