Patent ID: 7775038

Claim:
A second air flow control apparatus, being disposed between an air inlet port of an engine and an exhaust port and configured for pushing a second air from the air inlet port to the exhaust port by the exhausting pressure of the exhaust gas, the second air flow control apparatus comprising: a body, having a cavity, an air inlet and an air outlet, the air inlet and the air outlet being connected through the cavity, the air inlet being connected with the air inlet port, the air outlet being connected with the exhaust port, an air flowing path being formed by the air inlet port, the air inlet, the air outlet and the exhaust port; a base, fixed in the cavity, having at least an opening for controlling the air flow through the air flowing path; a moving member pivotably disposed in the cavity or the base by a spring force and having at least a gate and a cover configured for controlling the area of the opening; and a gas thread being connected to the moving member and configured for pulling the moving member to generate a processional rotation by a loading spring force and a resetting rotation by a releasing spring force, the rotations being configured for controlling the gate and the cover part to adjust the opening area of the opening and for controlling the cover part to close the opening so as to control the second air flow in the air flowing path, wherein a spring is disposed between the moving member and the body or the base, the spring being configured for making the moving member generate a processional rotation by a loading spring force and a resetting rotation by a releasing spring force.