在上止点前打开进气门并在下止点增大气缸内的油气混合物之后关闭。
Opening the intake valve before TDC and closing it after BDC increase the fill of air-fuel mixture in the cylinder.
当活塞下移时，汽化的燃料和空气的混合物通过进气门进入气缸。
As the piston moves down, the vaporized mixture of fuel and air enters the cylinder through open intake valve.
当活塞到达进气行程的下止点时，随着空气燃油的混合气进入气缸，进气门关闭。
When the piston reaches the bottom of the intake stroke, the intake valve closes, trapping the air-fuel mixture in the cylinder.
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