JPH0311135A - Intake quantity controller for engine - Google Patents

Abstract

PURPOSE:To reduce the rate of change of the opening port area in a low opening degree region by allowing a main trunk body and an auxiliary trunk body to form a restricted inner wall surface for maintaining the gap from the outside peripheral edge at small value when the opening degree of a throttle valve is less than a prescribed value, continuously to a closed inner wall surface, at an opposed position, keeping a throttle valve shaft interposed. CONSTITUTION:When a throttle valve 5 starts opening from an idle position X-X, each outside peripheral edge 5a, 5b shifts in the direction separating from a perfect opening position Y-Y until the passing through a plane L-L, and the outside peripheral edge 5a, 5b shifts, increasing the gap little by little along the restricted inner wall surface 8 of an inclined main trunk body 1 and the restricted inner wall surface 10 of an auxiliary trunk body 2. Therefore, the rate of increase of the opened port area is small, an the intake quantity increases little by little. After passing through the plane L-L, the gap between the inclined bulging-out parts 7 and 9 of the main trunk body 1 and the auxiliary trunk body 2 gradually increases, and the intake quantity increases in the equal degree to the conventional.

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, opens and closes by directly transmitting the driver's accelerator operation to the throttle valve shaft. Since the amount of rotation of the throttle valve and the amount of rotation of the throttle valve correspond proportionally, especially in the low opening range 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. Therefore, for example, if you start opening the throttle valve from idling, the engine speed will suddenly increase and the car will start suddenly.In the medium to low speed range, the intake air amount will still change considerably with a slight change in the rotation amount, so L' I Ji! ! 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 is suitable for wire guides in order to achieve stable medium-low speed operation by reducing the ratio of the throttle valve rotation amount to the accelerator operation amount in the low opening range of the throttle valve. This is an attempt to solve the above-mentioned technical problems that there are design restrictions and the degree of freedom is small when creating a shape that is similar to the above, and that 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 change in opening area can be made arbitrarily small 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 condition control device.

(Means for solving the problem) rJ? As a means for solving the technical problem described in Section J, the present invention includes a main body through which a throttle valve shaft is supported, and an auxiliary body coupled to the entrance or exit side of the main body. The butterfly-shaped throttle valve attached to the throttle valve shaft has a closing inner wall surface that is substantially in contact with the outer periphery of the butterfly-shaped throttle valve when the throttle valve is in an idle position, and the main body and the auxiliary body have an opening of the throttle valve below a predetermined opening. A restricting inner wall surface that maintains a small gap with the outer circumferential edge is continuous with the closing inner wall surface at a location opposite to the throttle valve shaft.

Incidentally, it is preferable that the operating range of the throttle valve is larger than (90-α) degrees, where α is the installation angle.

(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) The present invention will be described in detail with reference to the drawings.

In the embodiment shown in Fig. 1, an auxiliary fuselage 2 is connected to the inlet side of the main fuselage 1 by bolts 3, and the main fuselage 1 is connected to an intake manifold, and the auxiliary fuselage 2 is equipped with an air flow meter, a supercharger, etc. Each end is formed so as to be connected to an intake conduit, and the main body 1 supports a throttle valve shaft 4 through it.

In the main body 1, the butterfly-shaped throttle valve 5 attached to the throttle valve shaft 4 is at idle position f? At the time of ff1X-X, the air passage wall has a closing inner wall surface 6 with which the outer peripheral edges 5a, 5b on both sides of the throttle valve shaft 4 are substantially in contact. The diametrically outer edge of the throttle valve 5 perpendicular to the throttle valve shaft 4 has an idle position X-X and a fully open position Y-
It is designed to move between Y and on arcs A and B,
It is therefore clear from the drawing that the operating range of the throttle valve 5 is greater than 90 degrees.

The part of the ventilation passage wall of the main fuselage 1 facing the outer peripheral edge 5a on the side that rotates toward the downstream side is in the fully open position Y.
- It has an inclined bulge 7 that gradually widens downstream with respect to Y, and the portion from the closing inner wall surface 6 to the plane L-L perpendicular to the fully open position Y-Y that passes through the throttle valve shaft 4 is restricted. An inner wall surface 8 is formed.

In addition, among the ventilation passage walls of the auxiliary fuselage 2, the portion facing the outer peripheral edge 5b on the side that rotates toward the upstream side is the entire cabinet 1Y.
It has an inclined bulging portion 9 that gradually widens toward the upstream side with respect to -Y, and the portion from the closing inner wall surface 6 to the surface L-L forms a limiting inner wall surface 10.

In this embodiment with such a configuration, when the throttle valve 5 starts to open from the idle position XX, the outer peripheral edges 5a and 5b move in the direction away from the fully open position YY until they pass through the plane LL. , hence the inclined inner wall surface 8.1
0 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 surface L7, the distance from the inclined bulge 7.9 gradually increases, and the intake air amount increases at the same rate as in the past.

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 installation angle of the throttle valve 5 with respect to the closed position, so as to fully open the throttle valve. It is a figure which shows the relationship between an angle and an opening area, Comprising: Curve B is a conventional product, and curve A is a product of this invention.

FIG. 2 shows an embodiment in which an auxiliary body 12 connected to an intake manifold is connected by bolts 13 to the downstream side of a main body 11 through which a throttle valve shaft 14 is supported and connected to an intake conduit. .

The main body 11 has a closing inner wall surface 16 where the outer circumferential edges 15a and 15b on both sides of the throttle valve 15 substantially touch when the throttle valve 15 is in the idle position aX-X, and a portion facing the outer circumferential edge 15b on the side that rotates toward the upstream side. It has an inclined bulge 17 that gradually widens toward the upstream side with respect to the fully open position Y-Y. The auxiliary body 12 has a closed inner wall surface having an inclined bulge 19 that gradually widens toward the downstream side with respect to the fully open position Y-Y at a portion opposite to the outer periphery 1i15a on the side that rotates toward the downstream side. The portion of each inclined bulge 17.19 from 16 to plane LL forms a limiting inner wall surface 18.20.

In this embodiment as well, the throttle valve 15 is at the idle position
When rotating between L and L, the outer J! M edge 15a
, 15b and the limiting inner wall surface 18.20 changes very slightly, and the rate of change in the amount of intake air is small.

(Effects of the Invention) According to the present invention, following the closing inner wall surface that sets the gap with the left outer periphery of the throttle valve during idling, the limiting inner wall surface maintains the gap with the outer periphery small below the predetermined opening of the throttle valve. is provided on at least one of both sides of the throttle valve shaft, so by appropriately setting the distance in the movement direction between the throttle valves on the inner wall surface of the restriction and the increase/decrease ratio of the opening area, the accelerator operation amount and the throttle valve can be adjusted. Even if the amount of rotation corresponds proportionally to the amount of rotation, 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 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 temperature is greater than 90-α) degrees.

In the high opening range of the throttle valve, the throttle valve rotation amount relative to the accelerator operation amount is set to the same level as before, and the engine can be fully opened while stabilizing engine operation.

Further, according to the present invention, the structure is extremely simple because it is only necessary to form the inner wall surface of the ventilation passage between the main body through which the throttle valve shaft is supported and the auxiliary body on the inlet or outlet side thereof into a predetermined shape. In addition, it has a large degree of freedom in design and can be easily formed into a shape suitable for the purpose, and since the internal wall surface and the restricted inner wall surface are formed on the inner surfaces of the two parts, it is extremely easy to perform molding and necessary finishing processing. 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... Main fuselage, 2, 12... Auxiliary fuselage, 4
．． 14... Throttle valve shaft, 5.15... Throttle valve, 5a,
5b, 15a, 15b...outer periphery, 6.16...
Closed inner wall surface, 8°10, 18.20... Restricted inner wall surface,

Claims (1)

[Claims] 1. The main body includes a main body through which a throttle valve shaft is supported and an auxiliary body connected to the inlet or outlet side of the main body, the main body having a butterfly shape attached to the throttle valve shaft. The throttle valve has a closing inner wall surface that substantially touches the outer periphery of the throttle valve when it is in an idle position, and the main body and the auxiliary body maintain a small gap with the outer periphery of the throttle valve at a predetermined opening degree or less. An intake air amount control device for an engine, characterized in that a limiting inner wall surface is continuous with the closing inner wall surface at a location opposite to the throttle valve shaft. 2. The intake air amount control device for an engine according to claim 1, wherein the throttle valve has an operating range larger than (90-α) degrees, where α is the mounting angle of the throttle valve.