JPH0318631A - Intake air quantity control device for engine - Google Patents

Abstract

PURPOSE:To improve operability by forming a restricted inner wall surface at least at one of the symmetrical parts with a throttle valve shaft interposed in between continuously from the closed inner wall surface in order to maintain the small gap with the outer peripheral edge of a throttle valve under its specified opening. CONSTITUTION:At the time of starting to open from its idle position X-X, a throttle valve 3 moves along restricted inner wall surfaces 9, 10 corresponding to outer peripheral edges 3a, 3b with a throttle valve shaft 2 interposed in between while enlarging gaps slightly at a time. The increase rate of the opening area is therefore small, the intake air quantity is increased little by little, and the intake air quantity after passing through the restricted inner wall surfaces 9, 10 is increased at the rate of the same degree as before. An intake air characteristic can be varied by differentiating the change rate of gaps between two restricted wall surfaces 9, 10 and the outer peripheral edges 3a, 3b of the throttle valve 3, differentiating the interval to maintain small gaps, and the like in addition to forming the restricted inner wall surfaces into idential shape. The throttle valve 3 can be thus opened to full admission while aiming at the stability of an engine.

Description

[Detailed Description of the Invention] [Industrial Application Field] Butterfly-shaped throttle valve 6 installed in the intake pipe of the present invention #'i
Therefore, it relates to a device for controlling the amount of intake air,
It is mainly used for controlling the intake air amount of multi-cylinder automobile engines. [Prior art] In order to control the amount of intake air by opening and closing a butterfly-shaped throttle valve installed in the intake pipe to control the rotational speed of the engine, it is difficult to simply control the amount of intake air in an intake system equipped with a fuel injection system. It is common to install a single throttle valve in one intake line to control the total intake air amount required by the machine/engine. In such an intake system, it is necessary to make the intake pipe line large in diameter, including the throttle body where the throttle valve is installed, in order to reduce intake resistance. Current engines, which aim to increase output by installing two intake ports in the combustion chamber, must have an even larger diameter, such as the exhaust! The throttle body used in the K3T engine is made with an inner diameter of about 80mm.

However, in this method, the throttle valve, which controls the intake air volume by changing the opening area of the inner diameter air passage, opens and closes by directly transmitting the driver's accelerator operation to the throttle valve shaft. Since the amount of throttle valve rotation corresponds proportionally to the amount of rotation of the throttle valve, especially in the low opening range of the throttle D valve, even a slight change in the rotation speed caused by a small amount of accelerator operation will cause a large change in the intake air amount. Therefore, for example, when you start opening the throttle valve from idling, the engine speed suddenly increases and the car starts suddenly. In the medium to low speed range, the amount of intake air changes significantly even with a slight change in the amount of rotation. This causes problems such as the rotational speed changing more than the target and impairing drivability.

As a countermeasure, the shape of the wire guide of the accelerator wire drum around which the accelerator wire is wound is shaped so that the ratio of the amount of rotation of the throttle D valve to the amount of accelerator operation is reduced, especially when the throttle valve is pressed in a low opening range. It is thought that. There are design limits to changing the shape, and I want to be able to fully meet the demands. In addition, the accelerator lever to which the accelerator wire is connected is attached to a shaft separate from the throttle valve shaft, and the throttle valve lever and the cam groove formed in one lever are interlocked by engaging the roller provided in the other lever. Link mechanisms have also been proposed and put into practical use in some cases (for example, the
! F# Publication No. 61-53537), the structure is complicated and the price is not only expensive. Since it is placed outside the fuselage, there are restrictions on where it can be installed within the narrow engine room.

[Problems that the invention attempts to solve]

The present invention uses a 6-piece valve having an A shape for the purpose of wire guide, in order to reduce the ratio of the throttle valve rotation amount to the accelerator operation amount by pressing the button in the low opening range of the throttle valve to achieve stable medium and low speed operation. There are design limitations and the degree of freedom is small.The link mechanism has a complex structure and is subject to restrictions on installation location.
This is an attempt to solve the above-mentioned technical problem, and even if the accelerator operation amount and the throttle valve rotation amount correspond to "proportional f", it is possible to arbitrarily reduce the rate of change in the opening lYJ product in the low opening range. The purpose of this invention is to provide an engine intake air amount control device that has a very simple structure and a high degree of freedom in design. [Means for solving the problem] In order to solve the above technical problem. The present invention is a means for.
A body to which a ll-shaped throttle valve is attached and which extends through and supports a 1% A throttle 9-valve shaft is symmetrical with the closed circular wall surface that almost touches the outer periphery of the throttle valve in its idle position, sandwiching the throttle valve shaft. At least one of the portions has a limiting inner wall surface that is formed continuously with the closed circular wall surface and maintains a small gap with the outer circumferential edge of the throttle D valve below a predetermined opening degree. did. In addition, the installation angle of the throttle valve is a
When doing so, it is better to set the operating range to a kennel range than (90-a) degrees. [Function] When the throttle D valve is in the idle position, its outer periphery almost touches the closing inner wall surface to seal the air passage or to form a gap through which air necessary for idling passes.
When the 9 throttle valves begin to open from the idle position, one of the two openings that hold the throttle valve shaft is at the upper fl#. The other side rotates toward the lower fi side, and one or both of its outer peripheries rests on the limiting closing surface and moves to reduce the rate of increase in the opening area. For this reason. Even if the accelerator operation amount and the throttle D valve rotation amount correspond proportionally, a sudden increase in the intake air amount is prevented when the opening is below the set opening.

〔Example〕

Embodiments of the present invention will be described with reference to the drawings.

Based on the example in Figure 1. The fuselage 1 is designed to connect an intake conduit and an intake manifold equipped with an air meter, a supercharger, etc. to the inlet end and the outlet end, and a throttle D valve shaft 2 is installed in the center. Press the button to support it. The butterfly-shaped throttle 9 valve 3 attached to the throttle valve shaft 2 is at the idle position @X-
When X, the outer peripheral edges 3α, 34 on both sides sandwiching the throttle D valve shaft 2
The closed inner wall surface 4, which is in almost contact with the air passage wall, is in contact with the air passage wall. is the arc A.B
It is clear from the drawing that the valve D moves upward, and therefore the operating range of the throttle D valve 3 is more than 90 degrees.
The closing inner wall surface 4 is shaped at right angles to the plane L--L containing the throttle valve 3 in the closed position. and. In the upstream joint air passage 50 of the throttle valve 3, within the air passage wall. IIO rotates toward the upper tIL1lI of throttle p valve 3
The part facing the outer circumferential green 3k moves upstream and then approaches the fully open position Y-Y.The inner surface, which is inclined almost along the arc B, is at the idle position of the closed Pl wall surface 4 [X-X The Yoshi also cooperates with the upstream portion to shape the inner wall surface 9 of the O limit.

Also. In the circle of the air passage wall of the air passage 6 on the downstream side of the throttle 9 valve 3. The part facing the outer peripheral edge 3a of the throttle valve 3, which rotates toward the downstream side of the throttle valve 3, moves downstream and approaches the fully open position Y-Y, DD, and is inclined almost along the arc. The inner surface cooperates with the idle position of the closed wall surface 4 and the downstream portion to form a limiting inner wall surface lO. In this embodiment with such a configuration, when the throttle valve 3 starts to open from the idle position tllIX-X, the two outer lIJfa edges that hold the throttle valve pongee 2 in between: l! ．． 34 moves along the corresponding limiting inner wall surface 9.10 with the gap increasing very slightly. For this reason. The rate of increase in the opening area is small and the amount of intake air increases little by little, but after passing through the limiting inner wall surface 9.10, the amount of intake air increases at the same level as before.

Therefore, even in the high opening range of the throttle D valve 3, if you set the throttle valve rotation amount relative to the accelerator operation amount to the same level as before to stabilize engine operation, the opening will be suppressed in the low opening range. Therefore, full throttle cannot be reached with the same amount of accelerator operation. For this reason, the installation angle of the throttle D valve 3 with respect to the closed position L-L is set to α
When the operating range is greater than (9G-α) degrees,
It is best to let it reach full throttle. Figure E4 is a diagram showing the relationship between the rotation angle of the throttle valve and the opening area. Curve B is the conventional product, and curve IIA is the product of the present invention.

In addition, in this embodiment, the two limiting inner wall surfaces 9 and 10 provided at symmetrical locations sandwiching the throttle valve shaft 2 have the same shape, and the outer peripheral edge 3α. Make the change rate of the gap with 34 different rL. Differentiate the intervals in which the gap is kept small. The intake characteristics can be changed step by step depending on the direction.

Figures 2 and 3 show different embodiments of the present invention, in which a restricting inner wall surface is provided only on the upstream side of the throttle valve or only on the downstream side of the throttle valve.

That is. ．． These are the throttle valve shaft 1 with the throttle valve shaft 23 attached.
When the throttle valve 13.23 is in the idle position IIIX-X, the throttle valve shaft u. Outer periphery 13α* on both sides sandwiching 22t
134+ Z3α, closing inner wall surface 1 where 234 almost touches
4.24, and the outer edge of the throttle valve 13, Z3 on the diameter perpendicular to the throttle valve axis u, 22 is at the idle position @X
It moves on a circular arc between -X and the fully open position Y-Y, and the operating range is 90 degrees. Shaped at right angles to L-L. This is the same as the embodiment shown in Figure 1.

In the embodiment shown in Fig. 2, the upstream air passage 1 of the throttle valve l3 is
50 Within the ventilation passage wall, move the part corresponding to the outer circumference I & 13 4 of the throttle valve l3 that rotates toward the upper fL @ upstream and then approach the fully open position Y-Y, and open its circular arc. B
The inner surface tilted approximately along the idling position X-x of the closing inner wall surface l4 cooperates with the upstream portion of the closing inner wall surface l9
It is shaped like

In the embodiment shown in Fig. 3, within the ventilation passage wall of the downstream passage of the throttle valve passage, the part corresponding to the outer circumferential edge 23a on the side that rotates towards the downstream side of the throttle valve passage is moved downstream. The inner surface inclined approximately along the arc C' and the closed inner wall surface 24 are at the idle position tix-x.
In addition, the downstream portion cooperates with each other to form a limited inner wall surface addition.

In these embodiments, when the throttle valve 13.23 begins to open from the idle position XX, the outer periphery 134, Z3α on one side of the throttle valve shaft 22 moves toward the corresponding limiting inner wall surface 19.23. : Move along the illusion, increasing the gap little by little. Even if the distance between the outer peripheral edges 13 El and 23 ◆ on the opposite side and the opposing ventilation passage wall is made into a kennel, the rate of increase in the overall opening area is kept small. After passing through the limiting inner wall surface 19.30, the intake air amount increases at the same rate as before. In addition, the outer periphery 13, 23a and the restricted inner wall surface ty. 30 may be formed to maintain a constant gap. [Effects of the Invention] According to the present invention, following the closing inner wall surface that sets the gap with the outer periphery of the throttle P valve applied during idling, a restriction is established to maintain the gap with the outer periphery small below the predetermined opening of the throttle 9 valve. Since the inner wall surface is provided on at least one of the two sides that sandwich the throttle valve shaft, it is possible to Even if the amount of accelerator operation and the amount of rotation of the throttle valve correspond proportionally, the amount of intake air is gradually increased or decreased in the low opening range of the throttle valve. This allows for stable and stable operation.

In addition, when the operating range of the throttle valve is defined as the installation angle α, (
90-α) If the degree is also used as a doghouse, stabilize the mechanical/engineering operation by setting the rotation amount of the throttle valve relative to the accelerator operation amount to the same level as before in the high opening range of the throttle valve. It is possible to fully open the engine while planning. Further, according to the present invention, the inner wall surface of the air passage of the body through which the throttle valve shaft is supported can be easily shaped into a predetermined shape.

[Brief explanation of the drawing]

Figures O1, O2, and O3 are longitudinal sectional views showing different embodiments of the present invention, and Figure O4 is a diagram showing the relationship between the rotation angle and the opening area of the throttle valve. 1, 11. 21...Torso. 2, 12
．． 22. ．． −． - Throttle 9 valve stem: 3e 13, Ji...
...9 valves of throttle. 3a, No. 3 13 lacquer, 23α...
...outer [periphery, 4.14.24...closed inner e surface. 9. lO, 19. 30...Limited inner wall surface. Substitution Mutsuaki Nozawa Neriben no Den〕Korokakusu〔

Claims (1)

[Scope of Claims] 1. A body penetrating and supporting a throttle valve shaft to which a butterfly-shaped throttle valve is attached has a closing inner wall surface that substantially touches the outer periphery of the throttle valve in its idle position, and and a limiting inner wall surface that is formed continuously with the closing inner wall surface at at least one of the symmetrical points sandwiching the throttle valve, and that maintains a small gap with the outer peripheral edge of the throttle valve at a predetermined opening degree or less. Features: Engine intake amount control device. 2. The intake control valve device for an engine according to claim 1, wherein the throttle valve has an operating range that is narrower than (90-α) degrees when its mounting angle is α.