直到1947年，美国工程师拉尔夫·米勒在简单的奥托循环发动机的基础上，

Until 1947, on the basis of a simple Otto cycle engine, American engineer Ralph Miller realized the Miller cycle with high thermal efficiency by closing the intake valve in advance. The Miller cycle is actually an improvement on the traditional Otto cycle, not a new thermodynamic cycle. Since the intake valve closes before intake bottom dead center, the intake stroke is shorter, so the cylinders entering the engine are less charged, and eventually the power output of the engine is reduced. The loss of maximum output power partially offsets the increase in the thermal efficiency of the Miller cycle engine. In order to ensure high power response output and high thermal efficiency, Miller further proposed to use mechanical supercharging to make up for the reduction of the explosive gas charge caused by closing the intake valve in advance. Since the Miller cycle is a low-temperature cycle, the engine performance can be improved by increasing the knock limit.

It was not until 1947 that American engineer Ralph Miller, on the basis of a simple Otto cycle engine, achieved a high-heat-efficient Miller cycle by closing the intake valve early. The Miller cycle is actually an improvement on the traditional Otto cycle, not a new thermodynamic cycle. Since the intake valve closes before the intake point is closed and the intake stroke is shorter, the cylinder entering the engine is inflated less and the final engine's power output is reduced. The loss of maximum output power partially offsets the increased thermal efficiency of Miller's cycle engine. In order to ensure high power response output and high thermal efficiency, Miller further proposed the use of supercharged to compensate for the early closure of the intake valve caused by the reduction of gas gas charge. Because the Miller cycle is a low temperature cycle, engine performance can be improved by increasing the knock limit.

Until 1947, Ralph Miller, an American engineer, realized the Miller cycle with high thermal efficiency by closing the intake valve in advance on the basis of a simple Otto cycle engine. Miller cycle is actually an improvement of traditional Otto cycle, not a new thermodynamic cycle. Because the intake valve closes before the lower dead center of intake, the intake stroke is shorter, so the cylinder entering the engine is less inflated, and the final engine power output is reduced. The loss of maximum output power partially offsets the improvement of thermal efficiency of Miller cycle engine. In order to ensure high power response output and high thermal efficiency, Miller further proposed to use supercharging to make up for the reduction of deflagration gas charge caused by early closing of intake valve. Because the Miller cycle is a low temperature cycle, the engine performance can be improved by increasing the knock limit.<br>