What is the secondary intake device of the automobile engine, and what is its function？

Secondary air intake refers to that in addition to the original air inhaled from the air filter, in addition to the vacuum pressure difference of the intake manifold, another intake device is connected to the outside of the engine PCV (crankcase forced ventilation) pipeline, and the appropriate amount of fresh air is poured to achieve the purpose of improving the volume ratio。

 The power improvement effect that can be obtained by the secondary intake is mainly at the low speed of the engine。Because the air valve is fully open at high speed, a large amount of air enters, and when the vacuum is reduced, the amount of air that can be imported by the secondary intake device becomes relatively insignificant。Secondary air intake device is important to maintain the right amount of air intake, the difference in the current market products is that the method of controlling the intake of imported air is different。If the amount of air intake is too little, the effect is not good, too much will reduce the vacuum, affect the auxiliary force of the brake vacuum power booster, so that the force required for braking becomes heavier, and the so-called appropriate amount is the result of the manufacturer's research and test。