Patent Application
20090114868
This application claims priority to, and the benefit of, Korean Patent Application No. 10-2007-0113220, filed in the Korean Intellectual Property Office on Nov. 7, 2007, the entire contents of which are incorporated herein by reference.
(a) Field of the Invention
The present invention relates to a throttle valve set with two valve plates.
(b) Description of the Related Art
A typical throttle valve is opened by depression of an accelerator pedal by a driver. In an idle state or an ignition state, an idle speed control actuator (ISCA) controls the throttle valve. The valve includes a circular plate that pivots about an axis along its diameter.
The amount of air passing by the throttle valve needs to be controlled accurately to control the amount of fuel supplied to the engine. However, the open portion increases in area rapidly, so precise control is difficult. Accordingly, it is difficult to achieve a precise air/fuel ratio.
The above information disclosed in this Background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known in this country to a person of ordinary skill in the art.
A throttle valve set for controlling an amount of intake air includes a shaft, a first valve plate connected to a first side of the shaft and rotating along with the shaft, a supporting plate connected to a second side of the shaft and rotating along with the shaft and the first valve plate, and a second valve plate at the second side of the shaft and rotatable with respect to the shaft. The supporting plate pushes the second valve plate such that the second valve plate rotates along with the shaft, the first valve plate, and the supporting plate in the supporting plate has rotated more than a certain amount.
The valve plates may be semicircular, and the shaft may be disposed along the diameter of the circle.
The second valve plate may have a depression configured for the supporting plate to be inserted therein.
The present invention will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown.
Referring to
The first valve plate 104 may have a shape defined by a circular arc and cord, such as the semicircle shown. The cord is disposed along the rotation shaft 102.
The hollow shaft 110 is substantially cylindrical, and the rotation shalt 102 is disposed therein. An open portion 202 (
The second valve plate 108 may have a shape defined by a circular arc and cord, such as the semicircle shown. The cord is disposed along the hollow shaft 110.
The rotation shaft 102 is connected to an actuator 112, which rotates the rotation shaft 102 depending on accelerator pedal manipulation by a driver. The rotational position of the rotation shaft 102 is detected by the throttle position sensor (TPS) 114. The rotation shaft 102 is biased toward its original position by an open spring 116 and a close spring 118.
Referring to
The rotation shaft 102 is disposed in the hollow shalt 110, the first valve plate 104 protrudes through the first opening 202, and the supporting plate 106 protrudes through the second opening 204.
A depression 206 is provided on the second valve plate 108, and the shape of the depression 206 corresponds to that of the supporting plate 106.
Referring to
The supporting plate 106 defines a fixed angle (180-Θ)° with the first valve plate 104. Θ may be, for example, 30°. For the first 30° that the first valve plate 104 rotates to the left in FIG, 3, the supporting plate 106 rotates integrally with it, but the second valve plate 108 is unaffected. Accordingly, the amount of air supplied to the engine is precisely controlled.
When the first valve plate 104 and the supporting plate 106 rotate more than Θ° by further depressing the accelerator, the supporting plate 106 presses against and rotates the second valve plate 108. Thus, both the first valve plate 104 and the second valve plate 108 rotate together.
When the throttle valve is closed completely, the plates have the configuration shown in solid lines in
The first valve plate 104 rotates in the 0° to 30° range in an idle state (when the engine operates but the accelerator is not pressed). This is referred to as the “idling angle.” Θ can be selected by a person of ordinary skill in the art based on the teachings herein, and based on the kind of engine. Preferably, 2°<≈Θ<≈40°.
Further, the second valve plate 108 can be rotated by the supporting plate 106 even in the idle state for some applications, such as if the coolant temperature is lower than normal in an idle state.
Also, for some applications, the second valve plate 108 does not rotate even though the accelerator pedal is pressed. For example, a limp-home angle is an angle in which the first valve plate 104 can rotate when the electronic throttle controller (ETC) is malfunctioning or has a disconnection short circuit.
(a) in
The angle defined between the supporting plate 106 and the second valve plate 108 is 30° in
While this invention has been described in connection with what is presently considered to he practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10-2007-0113220 | Nov 2007 | KR | national |
