Patent Application
20150068482
The present invention relates to variable intake structures, and more particularly, to a kinetic system-oriented variable intake structure capable of high performance at any target rotation speeds.
Air flows within an intake pipe of an engine by pulsating, and the resultant pressure wave travels along a passage of the intake pipe. The pressure wave is of a wavelength which depends on the pulsating frequency, air flow rate or flow speed. As soon as the pressure wave reaches the terminal end of the passage or comes cross any obstacle within the passage, the pressure wave produces a reflection wave which propagates along the passage reversely. As a result, the resultant pressure wave consists of the principal pressure wave and the reflection wave. The principal pressure wave and the reflection wave either strengthen or offset each other, depending on their input phase or output phase.
If the intake pipe passage length and flow rate are of values which cause the pressure wave to strengthen at an inlet valve, the pressure wave will increase the flow rate of the air entering a cylinder. The increase in the air entering the cylinder enhances the volumetric efficiency thereof However, in case of a phase difference between the reflection wave and the principal pressure wave, the pressure for driving air into the cylinder will decrease slightly, so will the volumetric efficiency thereof. All early engines and most later engines are based on a passive length intake passage system whose passage length is designed in accordance with a specific flow rate and pulsation timing, that is, being applicable to only a specific speed. When it comes to other rotation speeds, the intake system is not only confronted with difficulty in the adjustment of its operation, but is also flawed with low volumetric efficiency at high rotation speeds and low rotation speeds; as a result, the intake system hardly has any industrial applicability.
It is an objective of the present invention to provide a kinetic system-oriented variable intake structure capable of high performance at any different rotation speeds.
In order to achieve the above and other objectives, the present invention provides a kinetic system-oriented variable intake structure, comprising: an intake passage; an exhaust passage; an air storing space communicating with the intake passage and the exhaust passage; a control valve turning on and off in accordance with a rotation speed of an engine; and a bypass air chamber in communication with the air storing space through the control valve.
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Furthermore, engine rotation speeds for controlling the control valve 15 to turn on and turn off are adjustable according to the setting and thus are not necessarily low rotation speeds to turn on or off the control valve 15, but are adjustable as needed.
In conclusion, the kinetic system-oriented variable intake structure of the present invention is feasible for certain and solves all the drawbacks of the prior art. Hence, the present invention meets the requirements of patentability, namely novelty, non-obviousness, and industrial applicability.
The present invention is disclosed above by preferred embodiments. However, persons skilled in the art should understand that the preferred embodiments are illustrative of the present invention only, but should not be interpreted as restrictive of the scope of the present invention. Hence, all equivalent changes and modifications made to the aforesaid embodiments should fall within the scope of the present invention. Accordingly, the legal protection for the present invention should be defined by the appended claims.
