JPH0311133A - Intake quantity controller for engine - Google Patents

Abstract

PURPOSE:To arbitrarily reduce the rate of change of the opening port area in a low opening degree region by constituting the title device so that an intake introducing pipe has a restricted inner wall surface for maintaining the small gap from the outside peripheral edge on one side of a throttle valve shaft in the case when the opening degree of the throttle valve is less than a prescribed value, continuously to a closed inner wall surface. CONSTITUTION:When a throttle valve 5 starts opening from an idle position X-X, an outside peripheral edge 5b shifts, increasing the gap little by little from a closed inner wall surface 6 along a restricted inner wall surface 10 or maintaining a nearly certain gap. Though, at the same time, the outside peripheral edge 5a gradually increases the interval from an opposed ventilating passage wall, the intake quantity increases, since the rate of increase of the opening area of the whole is little. After the passing through the restricted inner wall surface 10, the intake quantity increases at a rate in the equal degree to the conventional. Therefore, even in the considerably high opening degree region of the throttle valve 5, the engine operation is stabilized by setting the turning quantity of the throttle valve for the accelerator operation quantity to the equal degree to the conventional, and then the perfect opening is suppressed with the equal accelerator operation quantity, since opening is suppressed in a low opening degree region.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a device for controlling the amount of intake air using a butterfly-shaped throttle valve installed in an intake pipe, and mainly relates to a device for controlling the amount of intake air by a butterfly-shaped throttle valve installed in an intake pipe. Used for intake air volume control.

(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, in an intake system equipped with a fuel injection system, a single It is common to install a single throttle valve in the intake line to control the total amount of intake air required by the 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 providing two intake ports in the combustion chamber, must have an even larger diameter.For example, the throttle body used in a 3P displacement engine has an inner diameter of approximately 80mm. It is made in

However, in this method, the throttle valve, which controls the intake air volume by changing the opening area of the large internal diameter air passage, is opened and closed by directly transmitting the driver's accelerator operation to the throttle valve shaft. Since the amount of rotation of the throttle valve corresponds proportionally to the amount of rotation of the throttle valve, even a slight change in the amount of rotation caused by a small amount of accelerator operation causes a significant change in the amount of intake air, especially in the low opening range of the throttle valve. 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 and low speed range, even a slight change in the rotation amount still causes a large change in the intake air amount, which exceeds the target. This causes problems such as the rotational speed changing and impairing drivability.

As a countermeasure, it may be possible to form the shape of the wire guide of the accelerator wire drum around which the accelerator wire is wound so that the ratio of the throttle valve rotation amount to the accelerator operation amount is small, especially in the low opening range of the throttle valve. However, there are design limits to changing the shape, and it is not possible to fully meet the demands. In addition, the accelerator lever to which the accelerator wire is connected is attached to a separate shaft from the throttle valve shaft, and the throttle valve lever and the cam groove formed on one lever are interlocked by engaging the roller provided on the other lever. Link mechanisms have also been proposed and put into practical use in some cases (for example, Japanese Patent Publication No. 56-501207, Japanese Patent Publication No. 5353-1983).
(Refer to each publication No. 7), not only is the structure complicated and expensive, but since it is placed outside the fuselage, there are restrictions on where it can be installed in the narrow engine room.

(Problems to be Solved by the Invention) The present invention has been developed for the purpose of wire guide in order to reduce the ratio of the throttle valve rotation amount to the accelerator operation amount in the low opening range of the throttle valve to achieve stable medium and low speed operation. The link mechanism has a complicated structure and is subject to restrictions on the location where it can be installed. This is an attempt to solve the above-mentioned technical problem,
Even if the accelerator operation amount and the throttle valve rotation amount correspond proportionally, the rate of change in the opening area can be arbitrarily reduced in the low opening range, and the engine has a large degree of freedom in design and has an extremely simple structure. The present invention aims to provide an intake-i control device.

(Means for solving the problem) As a means for solving the above technical problem, the present invention includes the following:
The body includes a body through which a throttle valve shaft is supported, and an intake conduit connected to either an inlet side or an outlet side of the body, and the body is configured to support a throttle valve when a butterfly-shaped throttle valve attached to the throttle valve shaft is in an idle position. The intake conduit has a closed inner wall surface substantially in contact with the outer circumferential edge thereof, and the intake conduit is within a limit that maintains a small distance between the lit and the outer circumferential edge on one side of the throttle valve shaft below a predetermined opening degree of the throttle valve. The structure is such that the wall surface is continuous with the closed inner wall surface.

Incidentally, it is preferable that the throttle valve has an operating range larger than 90-α) degrees, where α is the mounting angle.

Additionally, the downstream intake conduit is typically an intake manifold.

(Function) When the throttle valve is in the idle position, its outer periphery is almost in contact with the closing inner wall surface to seal the ventilation passage or form a gap through which air necessary for idling passes. When the throttle valve starts to open from the idle position, one of the two sides of the throttle valve shaft rotates toward the upstream side and the other toward the downstream side, and one of its outer peripheral edges moves along the restriction closing surface. By doing so, the rate of increase in the opening area is reduced. Therefore, even if the accelerator operation amount and the throttle valve rotation amount correspond proportionally, a sudden increase in the intake air amount is prevented below the set opening degree6 (Example) explain.

In the embodiment shown in Fig. 1, an intake conduit 2 equipped with an air flow meter, a supercharger, etc. is connected to the inlet side, and an intake manifold 3, which is an intake conduit on the opposite side, is connected to the downstream side. but! The body 1 has a butterfly-shaped throttle valve 5 attached to a throttle valve shaft 4 at an idle position fa
When X, the aperture is at the outer periphery 5a on both sides of l#lI4.
, 5b have a closed inner wall surface 6 in substantially contact with the air passage wall.

The diametrically outer edge of the throttle valve 5 perpendicular to the throttle valve shaft 4 is configured to move on circular arcs A and B between the idle position XX and the fully open position Y-Y. It is clear from the drawing that the operating range of is greater than 90 degrees. rJ5 stop inner wall inner wall surface 6 throttle valve 5 in closed position
It is formed perpendicularly to the plane LL containing the .

Further, within the air passage wall of the intake conduit 2, the portion facing the outer peripheral edge 5b on the side that rotates toward the upstream side has a curved portion 9 that gradually approaches the fully open position Y-Y toward the upstream side. The inner surface curved substantially along the arc B cooperates with a portion of the closing inner wall surface 6 upstream of the idle position XX to form a limiting inner wall surface 10.

The portion of the body 1 facing the inlet curved portion 9 and the outlet portion on the same side as the curved portion 9 are formed into an inclined surface 7.8 extending in approximately the same direction as the fully open position Y-Y, and are formed into an inclined surface 7.8 that extends in the same direction as the fully open position YY. 2 to the intake manifold 3 with little resistance.

In this embodiment with such a configuration, when the throttle valve 5 starts to open from the idle position
The gap increases gradually along the line or moves while maintaining a nearly constant gap. At the same time, the outer peripheral edge 5a rotating toward the downstream side gradually increases the distance between it and the opposing ventilation passage wall, but since the rate of increase in the overall opening area is small, the intake air amount increases little by little. be. After passing through the restricting inner wall surface 10, the intake air amount increases at the same rate as in the conventional case.

Therefore, even in the fairly high opening range of the throttle valve 5, 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. Full throttle cannot be reached with the same amount of accelerator operation. For this reason, it is preferable to set the operating range to be larger than (90-α) degrees, where α is the mounting angle of the throttle valve 5 with respect to the closed position LL, and to fully open the throttle valve 5. FIG. 3 is a diagram showing the relationship between the rotation angle and the opening area of the throttle valve, where curve 1 is for the conventional product and curve MA is for the product of the present invention.

In the embodiment shown in FIG. 2, a throttle valve shaft I4 is supported through a body 11 which connects an intake conduit 12 to the inlet side and an intake manifold 13 to the downstream side, and the body 11 is attached to the throttle valve shaft 14. The butterfly-shaped throttle valve 15 is the idol! x-
When x, the outer peripheral edges 1.5a on both sides of the throttle valve shaft 14
, 15b has a closing inner wall surface 16 on the ventilation passage wall that is almost in contact with the throttle valve 15, and the outer edge of the throttle valve 15 on a diameter perpendicular to the throttle valve axis 14 is located between the idle position XX and the fully open position Y-Y. The operating range of the throttle valve 15 is 9.
greater than 0 degrees, the closing inner wall surface 16 is perpendicular to the plane L-L across the throttle valve 15 in the closed position;
This is the same as the embodiment shown in FIG.

In this embodiment, a curved portion 19 is provided in the air passage wall of the intake manifold 13 at a portion facing the outer peripheral edge +5a on the side that rotates toward the downstream side, so that the curved portion 19 gradually approaches the fully open position Y-Y toward the downstream side. , the inner surface curved approximately along the arc A cooperates with a portion of the closing inner wall surface 16 downstream of the idle position XX of the throttle valve 15 to form a limiting inner wall surface 20.

Also in this embodiment, when the throttle valve 15 rotates along the closed inner wall surface 20, the gap with the outer peripheral edge 15a changes very slightly or remains constant, and the rate of change in the intake air amount is small.

(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 valve during idling, the limiting inner wall surface maintains the gap with the outer periphery small at a predetermined opening of the throttle valve or less. is provided on one of both sides of the throttle valve shaft, so by appropriately setting the distance in the throttle valve rotation direction of this restriction inner wall surface and the increase/decrease rate of the opening area, the accelerator operation amount and throttle valve rotation can be adjusted. Even if the intake air amount corresponds proportionally to the intake air amount, the intake air amount can be increased or decreased little by little in the low opening range of the throttle valve, and the engine can be operated stably in the medium to low speed range.

In addition, when the operating range of the throttle valve is defined as the installation angle α, (
If the throttle valve is set larger than 90-α) degrees, it is possible to fully open the throttle valve while stabilizing engine operation by setting the throttle valve rotation amount relative to the accelerator operation amount to the same level as before in the high opening range of the throttle valve. can.

Further, according to the present invention, the structure is extremely simple because it is only necessary to form the inner wall surface of the air passage between the body through which the throttle valve shaft is supported and the intake conduit on the inlet side or the outlet side thereof into a predetermined shape. Both have a large degree of freedom in design and can be easily formed into a shape suitable for the purpose, and since a closed inner wall surface and a restricted inner wall surface are formed on the inner surfaces of the two parts, molding and necessary finishing processing can be performed extremely easily. There is an advantage.

[Brief explanation of drawings]

1 and 2 are longitudinal sectional views showing different embodiments of the present invention, and FIG. 3 is a diagram showing the relationship between the rotation angle and the opening area of the throttle valve. 1.11... fuselage, 2,12... intake pipe, 3.1
3... Intake manifold, 4.14... Throttle valve shaft, 5
．． 15... Throttle valve, 5a, 5b, 15a, 1
．． 5b--outer periphery, 6. 16...Closing inner wall surface, 10. 20...Limited inner wall surface,

Claims (1)

[Claims] 1. It includes a body that extends through and supports a throttle valve shaft, and an intake conduit connected to either the inlet side or the outlet side of the body,
The body has a closed inner wall surface that substantially contacts the outer periphery of the butterfly-shaped throttle valve attached to the throttle valve shaft when the throttle valve is in the idle position, and the intake conduit has a closed inner wall surface that substantially contacts the outer peripheral edge of the butterfly-shaped throttle valve attached to the throttle valve shaft, and the intake conduit An intake air amount control device for an engine, comprising a limiting inner wall surface that is continuous with the closing inner wall surface and that maintains a small gap with the outer peripheral edge on one side of the throttle valve shaft. 2. The engine intake control valve device according to claim 1, wherein the throttle valve has an operating range larger than (90-α) degrees, where α is the mounting angle. 3. Claim 1, wherein the downstream intake conduit is an intake manifold.
Intake control device for the engine described.