JPH0315631A - Intake quantity controller of engine - Google Patents

Abstract

PURPOSE:To gradually perform the decrease and the increase of intake quantity so as to stabilize engine performance by arranging a control inner wall face which maintains the gap less than the specified opening of the throttle valve in continuation to a closed inner wall face which sets a gap with respect to the outer peripherary of a throttle valve at the time of idling. CONSTITUTION:Respective intake pipes 2,3 are connected to an entrance and an exit sides of body 1, and a throttle valve 5 is supported, through a throttle valve shaft 4, at the center of the body 1. By this constitution, when the throttle valve 5 is at the idle position X-X, a closed inner wall face 6 with which both outer peripheraries 5a, 5b are, respectively, brought into contact is formed at ventilation passage walls of the body 1. At the passage walls of the respective intake pipes 2,3, the respective control inner wall faces 8,10 which maintain a gap between both the outer peripheraries 5a, 5b, respectively, are formed continuously to the closed inner wall face 6 at the symmetrical position around the throttle shaft 4, with the level of opening less than the specified opening of the throttle valve 5.

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 an engine with an exhaust ffi,l has an inner diameter of approximately It is made to 80mm.

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. As a countermeasure, the accelerator wire is designed to reduce the ratio of the throttle valve rotation amount to the accelerator operation amount, especially in the low opening range of the throttle valve. Although it has been considered to form the shape of the wire guide of the wound accelerator wire drum, there is a design limit to changing the shape, and it is not possible to fully meet the requirements. 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 on one lever are interlocked by engaging the roller provided on the other lever. Link mechanisms have also been proposed and have been put into practical use in some cases (for example, Japanese Patent Publication No. 56-501207, Japanese Patent Publication No. 535-1982).
(Refer to each publication No. 37), the structure is not only complicated and expensive, but also because it is placed outside the fuselage, there are restrictions on where it can be installed in the narrow engine room.

(Problem M to be solved by the invention) The present invention is aimed at wire guides 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-low speed operation. This is an attempt to solve the above-mentioned technical problems that there are design restrictions in creating a suitable shape and the degree of freedom is small, and the link mechanism has a complicated structure and is subject to restrictions on the installation location.
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 purpose of the present invention is to provide an intake air amount 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 that extends through and supports a throttle valve shaft, and an intake conduit connected to either an inlet side or an outlet side of the body, and the body has a body that supports a throttle valve shaft when the butterfly-shaped throttle valve attached to the throttle valve shaft is in an idle position. The two intake conduits have a closing inner wall surface that is substantially in contact with the outer circumferential edge of the throttle valve, and the two intake conduits have a limiting inner wall surface that maintains a small gap with the outer circumferential edge of the throttle valve at a predetermined opening of the throttle valve or less. The structure is such that it is continuous with the closing inner wall surface at a symmetrical location sandwiched therebetween.

In addition, it is preferable that the operating range of the throttle valve is larger than (901 α) degrees, where α is the installation 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 both of its outer peripheries move along the limit 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 when the opening degree is below the set opening degree.

(Example) An example of the present invention will be described with reference to the drawings. FIG. 1 shows an embodiment of the present invention, in which 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 the intake conduit on the opposite side, is connected to the outlet side. A throttle valve shaft 4 is supported through the connected body 1,
When the butterfly-shaped throttle valve 5 attached to the throttle valve shaft 4 is in the idle position x-X, the body 1 has a closed inner wall surface 6, where the outer peripheral edges 5a and 5b on both sides of the throttle valve shaft 4 are almost in contact with each other, as the ventilation passage wall. have.

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 working range of is greater than 90 degrees. The closing inner wall surface 6 is a surface L- that includes the throttle valve 5 in the closed position.
It is formed perpendicular to L.

A portion of the air passage wall of the intake conduit 2 that faces the outer peripheral edge 5b on the side that rotates toward the upstream side has a curved portion 7 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 second limiting inner wall surface 8.

Further, in the air passage wall of the intake manifold 3, the portion facing the outer circumference Q5a on the side that rotates toward the downstream side has a curved portion 9 that 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 6 downstream of the idle position XX to form a second limiting inner wall surface IO.

In this embodiment with such a configuration, when the throttle valve 5 starts to open from the idle position
Move along O while increasing the gap little by little. Therefore, the rate of increase in the opening area is small and the intake air amount increases little by little. After passing through the limiting inner walls 8 and 10, the intake air amount increases at the same rate as before.

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. 2 is a diagram showing the relationship between the rotation angle and the opening area of the throttle valve, where curve B is for the conventional product and curve A is for the product of the present invention.

Note that the two limiting inner wall surfaces 8 and 1O provided at symmetrical locations across the throttle valve shaft 4 are of the same shape, and are also designed with gaps that vary the rate of change of the gap with the outer circumferential edges 5a and 5b of the throttle valve 5. Intake characteristics can be varied in various ways by, for example, varying the sections that are kept 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. are provided on both sides of the throttle valve shaft, so by appropriately setting the distance between these two limiting inner wall surfaces in the throttle valve rotation direction and the opening area increase/decrease table, the accelerator operation amount and the throttle valve can be adjusted. Even if the rotary claws correspond proportionally, the amount of intake air can be increased or decreased little by little in the low opening range of the throttle valve, allowing the engine to operate extremely 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, 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 and outlet sides thereof into a predetermined shape, so that the structure is extremely simple and Not only does it have a large degree of freedom in design and can be easily formed into a shape suitable for the purpose, but since a closing inner wall surface and a restricting inner wall surface are formed on the inner surfaces of the three parts, it is extremely easy to perform molding and necessary finishing processing. There are advantages.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, and FIG. 2 is a diagram showing the relationship between the rotation angle and the opening area of the throttle valve. l... Body, 2... Intake conduit, 3... Intake manifold, 4... Throttle valve shaft, 5... Throttle valve, 5a, 5b
...Outer periphery, 6...Closing inner wall surface, 8, 10...
Restricted inner wall surface, Figure 1A Figure 2

Claims (1)

[Claims] 1. The body includes a body that extends through and supports a throttle valve shaft, and an intake conduit connected to the inlet and outlet sides of the body, and the body includes a butterfly-shaped throttle valve attached to the throttle valve shaft. has a closed inner wall surface that substantially touches the outer periphery of the throttle valve when it is in the idle position, and the two intake conduits have a limiting inner wall surface that maintains a small gap with the outer periphery below a predetermined opening of the throttle valve. An intake air amount control device for an engine, characterized in that the intake air amount control device is provided continuously on the closing inner wall surface at a symmetrical location across 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.
An intake control valve device for the engine described.