JPH112170A - Idle intake control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent closure of a bypass passage in a throttle valve in which an idle intake regulation valve of an internal combustion engine is provided by a combustion product. SOLUTION: In an idle intake control device, an outlet passage 8 in the downstream of an idle intake regulation valve 3 provided in a bypass passage 12 of a throttle valve 11 is bent, and an accumulation chamber 9a is provided under an accumulation chamber passage 9 extended from the outlet passage 8 on the opposite side of an outlet opening 8a. When a combustion product 6 in an intake chamber 5 flows on an reverse flow 7 to invade into the outlet passage 8, it goes straight to advance to the accumulation chamber passage 9 to be stored in the accumulation chamber 9a, so it will not invade into an idle intake regulation valve 3. As a ball body 17 of metal is contained in the accumulation chamber 9a, it rolls in the accumulation chamber 9a by vibration of an engine to crush the combustion product 6, so fine grain of the combustion product 6 flows on a normal flow 4 of idle intake to be sucked to return to the intake chamber 5. The accumulation chamber 9a may be composed replaceable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an idle intake control device suitable for use in, for example, an internal combustion engine for an automobile.

[0002]

2. Description of the Related Art A conventional idle intake control device of this type has a structure as shown in FIG. 2, and is provided with an idle intake control valve which forms a gap in a bypass passage of a throttle valve by rotating or moving a door back and forth. The air passes through the gap to control the idle speed of the internal combustion engine or the like. (See JP-A-6-101604 or JP-A-2-7369).

[0003]

When an internal combustion engine having a conventional idle intake control device is operated, combustion products such as carbon present in the intake chamber move the bypass passage toward the idle intake control valve. When the air flows backward and adheres to and accumulates on the intake air adjustment valve, the flow path of the air may be narrowed and an error may occur in the flow rate control.
In this case, if a narrow passage portion such as a maze is provided on the downstream side of the intake adjustment valve, the passage is more likely to be clogged with a combustion product in the portion, rather than closing the passage. Therefore, an object of the present invention is to provide a new means for solving such a problem of the related art.

[0004]

In order to achieve the above object, the present invention provides a storage chamber capable of storing combustion products such as carbon in a bypass passage from an intake chamber to an intake control valve in an idle intake control device. Is provided. The present invention further accommodates a spherical metal piece in this storage chamber so that it can be rolled,
A means is provided for crushing the accumulated combustion products and returning them to the intake chamber side, or for replacing the accumulation chamber itself with a chamber in which the combustion products have not yet accumulated.

[0005] Since the idle intake control device of the present invention has the above-mentioned means, the combustion products are accumulated in the accumulation chamber before the backflow of the combustion products flows through the bypass passage of the throttle valve and adheres to the intake adjustment valve. The finely divided combustion products are sucked back toward the intake chamber along the idle flow of idle intake air. Therefore, since the combustion products are prevented from adhering and accumulating on the intake control valve, the bypass passage is not narrowed, and the flow control error can be eliminated. Note that, when the combustion products accumulate in the accumulation chamber, the same effect can be obtained by replacing the accumulation chamber itself.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an idle intake control device according to the present invention will be described in detail with reference to an embodiment shown in the drawings. FIG. 1 shows a first embodiment in which the present invention is applied to an internal combustion engine for an automobile, and FIG. 2 shows a conventional intake adjusting mechanism for comparison with the device of the present invention shown in FIG. First, in FIG. 2 showing a conventional example, reference numeral 1 'denotes a throttle body, which is provided with a throttle valve 11 and has a suction chamber 5'.
Is connected upstream. 2 is the throttle body 1 '
It is an idle intake adjustment valve body attached to the. 1
Reference numeral 2 denotes a bypass passage provided in the throttle body 1 '. The front passage 12a and the rear half 1 of the bypass passage 12 connect the upstream side and the downstream side of the throttle valve 11.
2b communicates with a cylindrical passage 13 and an outlet passage 14 inside the idle intake adjustment valve body 2, respectively.
Reference numeral 3 denotes an idle intake adjustment valve that can rotate in the cylindrical passage 13, and reference numeral 15 denotes a gap formed by the idle intake adjustment valve 3 and the outlet passage 14. The direction of the normal intake flow (forward flow) is indicated by an arrow 4 and the direction of the reverse flow is indicated by 7.

When the throttle valve 11 is closed, the idle intake air 4 passes through the first half 12a of the bypass passage in the throttle body 1 ', and further passes through the idle intake adjusting valve body 2.
After passing through a cylindrical passage 13 inside the throttle body 1, it is metered by a gap 15 between the outlet passage 14 and the idle intake control valve 3, and then passes through the rear half 12 b of the bypass passage in the throttle body 1 ′. To the combustion chamber of the internal combustion engine.

Depending on the operating conditions of the internal combustion engine, combustion products 6 such as carbon present in the intake chamber 5 due to exhaust gas recirculation (EGR) or backflow from the combustion chamber to the intake side.
Flows back toward the idle intake control valve 3 in the direction of arrow 7, and the surface 3a of the idle intake control valve 3 and the outlet passage 14
By adhering to and accumulating on the surface 14a, the gap 15 with the idle intake adjustment valve 3 is narrowed, and an error may occur in the flow rate control.

Therefore, the first aspect of the present invention which has solved this problem is as follows.
A specific configuration of the apparatus according to the embodiment will be described with reference to FIG. The device of the first embodiment also has a basic configuration as an idle intake control device which is almost the same as the conventional example of FIG. 2, but the structure of the throttle body 1 is partially different as described later. Reference numeral 2 denotes an idle intake adjustment valve body connected to the upstream side of the throttle body 1, and reference numeral 12 denotes a bypass passage for the throttle valve 11 provided in the throttle body 1, and a front half portion 12a and a rear half portion 12b thereof are formed. Passages 13 and 14 inside the idle intake control valve body 2 respectively
Is in communication with Reference numeral 3 denotes an idle intake adjustment valve, and reference numeral 15 denotes a gap formed by the idle intake adjustment valve 3 and the passage 14, which are the same as the conventional example shown in FIG.

As a feature of the first embodiment of the present invention shown in FIG. 1, an outlet passage 8 opening to the intake chamber 5 is connected to the rear half portion 12b of the bypass passage 12 at a right angle.
A storage chamber passage 9 is formed on the side opposite to the opening 8a, and a storage chamber 9a for communicating with the storage chamber passage 9 to deposit combustion products 6 such as carbon is provided in a direction where gravity acts, that is, below. Further, a metal sphere 17 is accommodated inside the storage chamber 9a, and a weir 16 is provided at the entrance of the storage chamber 9a so that the metal sphere 17 does not protrude into the storage chamber passage 9. Has become.

Here, the storage chamber passage 9 is connected to the intake chamber 5
It is important that the storage chamber 9a be formed at a location recessed in the shape of a lateral hole on the side opposite to the opening 8a on the extension of the outlet passage 8 that opens into the storage chamber 9a, and that the storage chamber 9a be under gravity. The internal volume of the passage 9 is one of the outlet passages 8 of the bypass passage.
The internal volume of the storage chamber 9a is preferably about ４ to 1/6, and the volume of the gap between the wall of the storage chamber 9a and the metal sphere 17 in a state where the metal sphere 17 is accommodated is equal to the outlet passage 8 of the bypass passage. Is preferably about 1/8 to 1/10.

Next, the operation of the idle intake control device according to the first embodiment having the configuration shown in FIG. 1 will be described. When the throttle valve 11 is closed in the operating state of the internal combustion engine, the idle intake air 4 passes through the first half 12 a of the bypass passage 12 in the throttle body 1 and the cylindrical intake passage 13 inside the idle intake adjustment valve body 2. After that, the flow rate is adjusted by a gap 15 between the outlet passage 14 and the idle intake control valve 3, further flows through the rear half 12 b of the bypass passage of the throttle body 1 and the outlet passage 8, and flows from the opening 8 a into the intake chamber 5. .

Here, as described above, depending on the operating conditions, combustion products 6 such as carbon flow from the inside of the intake chamber 5 back into the outlet passage 8 of the bypass passage from the opening 8a. According to the first embodiment, the combustion products 6 that have flowed backward flow straight from the inside of the intake chamber 5 through the outlet passage 8 of the bypass passage, pass through the accumulation chamber passage 9, and collide with the end wall 10. Since the combustion products have a larger mass per unit volume than air or the like and are heavy, they are separated from the air, fall into the accumulation chamber 9a, and are stored there.

In this state, the combustion products 6 such as carbon may adhere to the inside of the storage chamber 9a and fill the storage chamber 9a. However, in the first embodiment, the metal sphere 17 is placed inside the storage chamber 9a. And the storage room 9a
A weir 16 is provided at the entrance of, so that the metal sphere 17 does not protrude from the accumulation chamber 9a. Therefore,
The metal spheres 17 roll inside the storage chamber 9a due to vibration when the internal combustion engine is operated, and pulverize the stuck combustion products 6, so that the pulverized combustion products 6 accumulate from the storage chamber passage 9. The air pulsatingly enters and exits the chamber 9a and is sucked into the intake chamber 5 again. At this time, the pulverized combustion products 6 are supplied to the surface 3a of the idle intake control valve 3 and the surface 1a of the outlet passage 14 in the conventional example shown in FIG.
Since the particle size is larger than the extremely fine combustion product 6 that adheres to and accumulates on the 4a, it does not get on the weak airflow that flows back to the idle intake control valve 3 through the passage bent at right angles. The metal sphere 17 is desirably made of stainless steel.

From the above operation, the combustion product 6 does not adhere to and accumulate on the surface 3a of the idle intake control valve 3 or the surface 14a of the outlet passage 14, so that the gap 15 of the idle intake control valve 3 is not narrowed. As a result, no error occurs in the flow control. FIG. 3 shows an idle intake control device according to a second embodiment of the present invention. The second embodiment is characterized in that, instead of accommodating the metal sphere 17 in the accumulation chamber 9a as in the first embodiment, the accumulation chamber 9b is provided as a detachable one that can be pulled out to the side. There is. Other configurations are the same as those of the first embodiment shown in FIG. Therefore, in the second embodiment, when the combustion products 6 accumulate in the accumulation chamber 9b, the accumulation chamber 9b can be pulled out and the combustion products accumulated in the accumulation chamber 9b can be removed. In this case, the storage room 9b may be taken out and the inside thereof may be cleaned, or may be replaced with a new storage room 9b. In the second embodiment shown in FIG. 3, the storage chamber 9b is of the draw-out type, but it goes without saying that the storage chamber 9b may be of a screw-in type or the like.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an idle intake control valve including a throttle body in an idle intake control device according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of an idle intake control valve including a throttle body in a conventional idle intake control device.

FIG. 3 is a sectional view of an idle intake control valve including a throttle body in an idle intake control device according to a second embodiment of the present invention.

[Explanation of symbols]

 1, 1 ': throttle body 2: idle intake control valve body 3: idle intake control valve 4: idle intake (forward flow) 5: intake chamber 6: combustion product 7: reverse flow 8: outlet passage of bypass passage 9: storage chamber Passageway 9a: Storage chamber 9b: Pull-out storage chamber 12: Bypass passageway 12a: Front half of bypass passageway 17: Metal sphere

Continued on the front page (72) Inventor Seiko Watanabe 14 Iwatani, Shimowakaku-cho, Nishio-shi, Aichi Prefecture Inside the Japan Automobile Parts Research Institute, Inc. (72) Inventor Koichi Gomi 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (72) Inventor Tadashi Akiyama 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation

Claims (5)

[Claims] In an internal combustion engine provided with a throttle valve, combustion of carbon or the like in an outlet passage of the bypass passage downstream of an intake adjustment valve that opens and closes a bypass passage of the throttle valve for adjusting an idle speed. An idle intake control device characterized by having a storage chamber capable of storing products. 2. The outlet passage as viewed from a junction of an outlet from the idle intake control valve, which is provided on the extension of the outlet passage and joins the outlet passage from the side. The idle intake control device according to claim 1, wherein a side hole or a vertical hole is provided on a side opposite to the outlet opening of the (i). 3. The idle intake control according to claim 1, wherein the storage chamber has a volume of 1/10 to 1/8 of a total passage volume of the idle intake control device. apparatus. 4. A spherical metal piece that can roll freely in the storage chamber to crush the combustion products such as carbon stored in the storage chamber and suck the product into the intake chamber again. The idle intake control device according to any one of claims 1 to 3, wherein: 5. The storage chamber in which combustion products such as carbon are accumulated can be removed, and can be replaced with a new storage chamber in which combustion products such as carbon are not accumulated. An idle intake control device according to any one of claims 1 to 4.