JPS58220922A - Air intake control device of internal-combustion engine - Google Patents

Abstract

PURPOSE:To improve warming performance of an exhaust system without deteriorating the idle operation property at engine cooling by connecting a fluid pressure operating chamber to a port located downstream a throttle valve and a port near the throttle valve in responce to the rate of warming. CONSTITUTION:When the cooling water temperature of an internal-combustion engine is lower than a prescribed value, a temperature sensitive change-over valve 31 is opened, and a suction pipe negative pressure delivery port 33 is connected with a diaphragm chamber 23. Negative pressure above a prescribed value appears at the port 33 during the idle operation and the atmospheric pressure appears there in other case. Therefore, the valve element 17 is closed at the time of the idle operation, and otherwise opened. When the engine cooling water temperature rises above a prescribed value, the temperature sensitive change- over valve 31 is closed, and the pressure appearing at a suction pipe negative pressure delivery port 28 is introduced into the diaphragm chamber 23. At the time of the idle operation and of a low load operation, negative pressure above a prescribed value is fed into the diaphragm 23, allowing the negative pressure to be reduced as the load increases.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an intake control device for an internal combustion engine, and more particularly to an intake device for an internal combustion engine having an intake boat structure of an induced intake swirl type.

As one of the intake boat structures of the variable intake swirl system used in internal combustion engines, it has a helical passage that swirls around an opening end to the combustion chamber and a straight passage that communicates with the opening end in a double ring shape. An intake boat structure in which an intake control valve for controlling the straight passage is provided in the middle of the passage was filed in Japanese Patent Application No. 56-5 by the same applicant as the present applicant.
No. 1149 and Special JII No. 120634H of 1983.

In an internal combustion engine equipped with this intake boat structure, when the straight passage is closed by the intake control valve, all of the intake air (air mixture) flows through the helical passage and flows into the combustion chamber, thereby increasing the combustion chamber noise. A strong intake swirl is generated, which increases the apparent flame speed, allowing operation with a lean mixture and maintaining stability even when the internal combustion engine is operated at low speeds, such as when running at idle. This improves driveability and allows the idle speed to be set low.On the other hand, when the straight passage is opened by the intake control valve, the intake air flows through the straight passage in addition to the helical passage and flows into the combustion chamber. By doing so, a strong intake air swirl does not occur in the combustion chamber, but the flow resistance of the intake boat to the intake air flow is reduced, and a reduction in charging efficiency is avoided.

The intake boat structure as described above is used when the internal combustion engine is operated at idle or low load in order to make effective use of this, that is, to improve combustion during idle or low load operation without reducing engine output. It is used in combination with a control device that closes the straight passage with the intake control valve when the internal combustion engine is running at medium to high loads, and opens the intake control valve to open the straight passage when the internal combustion engine is operating at medium to high loads.

As mentioned above, when the earth flame speed increases, the combustion speed increases and the thermal efficiency of the engine improves, but the exhaust gas amount decreases by 8g. For this reason, if the straight passage is closed by the intake control valve during idling or low-load operation even when the engine is cold, high-temperature exhaust gas cannot be obtained, resulting in a delay in warming up the exhaust system of the engine. For this reason, in internal combustion engines equipped with a catalytic converter for exhaust gas purification in the engine exhaust system, there is a problem in that the warm-up of the catalytic converter is delayed and the amount of harmful components in the exhaust gas released into the atmosphere increases. .

If the intake control valve is always fully opened when the engine is cold, regardless of the engine load, the exhaust gas temperature will rise and the exhaust system will warm up more quickly. When the engine is cold, the idling performance deteriorates further, and the idling speed when the engine is cold must be set considerably high.

SUMMARY OF THE INVENTION The present invention aims to provide an air intake control device that improves exhaust system warm-up as much as possible without deteriorating idling performance when the engine is cold.

The invention will now be described in detail by way of example embodiments with reference to the accompanying drawings.

First, with reference to FIGS. 1 to 7, an embodiment of an intake boat structure used for implementing the intake control device according to the present invention will be described. 1 to 7, reference numeral 1 indicates a cylinder head of an internal combustion engine, and the cylinder head has an intake boat 3 that guides a mixture of air and fuel into a combustion chamber 2. As shown in FIG. The intake boat 3 opens into the side wall of the cylinder head 1 at one end, and opens into the combustion chamber 2 from the lower bottom wall of the cylinder head 1 at the other end. Here, one end of the intake boat 3 is referred to as an inlet opening end 4, and the other end is referred to as an outlet opening end 5. The inlet opening end 4 is connected to an intake manifold (not shown), and the outlet opening end 5 is selectively opened and closed by an annular valve seat @ 6 and an intake valve 7 attached to the opening end. ing.

The intake boat 3 is inclined toward the outlet opening end 5 as it goes from the inlet opening end 4 to the outlet opening end 5, and is bent sharply near the outlet opening end 5 to communicate therewith. A guide vane 10 is formed in a bulging manner on the inner wall of the boat (the ceiling wall of the boat) facing the outlet opening end 5 . The bulge of this guide vane gradually increases from the inlet opening end 4 toward the protruding lower open end 5, and the amount of bulge is maximum at the portion corresponding to the central axis of the outlet opening end 5. It has become. A stem 8 of the intake valve 7 passes through this maximum bulging portion, and a valve retainer 9 is attached to this portion. The guide vane 10 has an inclined wall part 1 on one side thereof which is inclined outward from the third intake boat as it goes from the inlet opening end 4 to the outlet opening end 5 with respect to the extending direction of the intake bow (-3).
1, and has a wire wall portion 12 parallel to the extending direction of the intake boat 3 on the other side. This guide vane 1
0', the intake boat 3 has a part of its cross section, that is, an upper space area in the figure, which is defined on one side by the inclined wall part 11 and has a helical passage 13 that turns flexibly around the outlet opening end '5, and both linear walls. It is divided into a straight passage 14 defined on one side by a portion 12 and communicating linearly with the end 5 between the IHs 11 .

The cylinder head 1 is equipped with an intake control valve assembly 15)
It is being The intake control valve assembly 15 includes a valve case 16 that is threadably coupled to the cylinder head 1, a plate-shaped valve element 17 that is rotatably supported by the valve case and extends across the middle of the straight passage 14. and a drive lever 19 attached to the valve stem 18 of the valve element 17. Valve element 17
The straight passage 14 is fully opened when the opening position is as shown, and the straight passage 14 is fully opened when the opening position is rotated approximately 90 degrees from this opening position.

When the straight passage 14 is fully open, substantially all of the air-fuel mixture flows through the helical passage 13 and reaches the outlet end 5.
This causes a strong intake swirl to occur in the combustion chamber 2.

At this time, the flame propagates and spreads on the intake swirl, which apparently increases the upper flame speed and increases the combustion speed.

When the valve element 17 is open and the straight passage 14 is open, a part of the air-fuel mixture flows through the straight passage 14 and flows out from the straight passage 14 and flows into the combustion chamber 2 through the opening end 5 and covers the opening. As a result, the helical flow of the air-fuel mixture flowing through the helical passage 13 is reduced and damped, and the intake swirl generated in the combustion chamber 2 is accordingly reduced, and at the same time, the flow resistance of the intake boat 3 to the intake flow is reduced. decreases.

The device of the present invention is used to control the opening and closing of the valve element 17, and one embodiment of the device of the present invention is shown in FIG.

In FIG. 8, 40 indicates an intake manifold, 41 a carburetor, 42 a throttle valve, 44 an exhaust boat, 45 an exhaust valve, and 46 an exhaust manifold.

The drive lever 19 of the intake control valve assembly 15 is drivingly connected to a rod 21 of a diaphragm device 20 so as to be rotationally driven by the diaphragm device. The diaphragm device 20 has a diaphragm 22, and when a negative pressure of J above a predetermined value is not introduced into the diaphragm chamber 23, the diaphragm 22 is moved by the spring force of the compression coil spring 24.
is biased in the 1ζ direction in the figure, bringing the valve element 17 to the fully open position as shown in the figure.On the other hand, when negative pressure is introduced into the noram chamber 23 of the die 17, the magnitude of the negative pressure in A is In response to this, the diaphragm 22 moves upward against the spring force of the compression coil spring 24, thereby driving the valve element 17 in the valve closing direction and reducing its opening, so that the negative pressure is below a predetermined value. At this time, the valve element 17 is not brought to the fully open position. The boat 25 of the diaphragm chamber 23 is connected to the intake pipe negative pressure take-out boat 28 of the intake manifold 40 via a conduit 26 and a conduit 27 having a pipe 29 in the middle. Further, the boat 25 is connected to an intake pipe negative pressure extraction boat 33 via a conduit 26, 30, a temperature-sensitive on-off valve 31, and a conduit 32.

The temperature-sensitive on-off valve 31 opens when the temperature of the cooling water of the internal combustion engine is below a predetermined value, and the valve element 34 is in the position as shown to connect the conduits 30 and 32 in communication, whereas the cooling water When the temperature is above a predetermined value, the bimetal 35 is inverted, causing the valve element 34 to rise by one level against the spring force of the spring 36, thereby disconnecting the conduits 30 and 32.

The intake pipe negative pressure take-out boat 28 is always connected to the throttle valve 42.
It is located on the downstream side. When the throttle valve 42 is at the idle opening position as shown in the figure, the intake pipe negative pressure take-out boat 33 is located on the downstream side of each slot i.
When the valve 42 is in a position opened from the idle opening position, the valve 42 is located on the 1-stream side thereof.

When the cooling water temperature of the internal combustion engine is below a predetermined value, that is, when the engine is cold, the temperature-sensitive switching valve 31 is open, so that when the internal combustion engine is idling, the intake pipe negative pressure is maintained. Since negative pressure appears in the take-out boat 33, the diaphragm chamber 2
3, a negative pressure equal to or higher than the predetermined value is introduced, and at other times, atmospheric pressure appears in the intake pipe negative pressure take-out boats i to 33, so the negative pressure of the intake pipe negative pressure take-out boat 28 is taken out from this intake pipe negative pressure take-out port. Almost atmospheric pressure is introduced into the flammable chamber 23 of the die A1. Therefore, when the internal combustion engine is idling, the valve element 17 is brought into the fully open position, and all of the air-fuel mixture flows through the helical passage 13 (into the combustion chamber 2), creating a strong intake swirl in the combustion chamber 2. As a result, the apparent upper flame speed becomes faster, and the negative combustion speed becomes faster.This improves the combustibility of the air-fuel mixture, and improves the idling performance when the engine is cold-open. On the other hand, when the engine is operating in an operating state other than idling, the valve element 17 is brought to the fully open position, and the air-fuel mixture flows through both the helical passage 13 and the straight passage into the combustion chamber 2 and is combusted. There is no generation of strong intake swirl in the combustion chamber 2. As a result, the combustion speed is slower than when a strong intake swirl is generated in the combustion chamber 2, and the combustion speed of the internal combustion engine is fast! , the exhaust gas is discharged at a higher temperature than at 1 o'clock, and the warm-up of the catalytic converter installed in the exhaust system is promoted.

When the engine cooling water temperature reaches a predetermined value or higher, that is, when the engine has been warmed up, the temperature-sensitive switching valve 31 closes, and the pressure appearing in the intake pipe negative pressure take-out boat 28 is always introduced into the direno ram chamber 23. Become so.

As a result, when the internal combustion engine is operating at idle or at a low load, a negative pressure equal to or higher than the predetermined value is introduced into the diaphragm chamber 23, and as the load increases, the negative pressure introduced into the diaphragm chamber 23 increases. Decrease. Therefore, when the internal combustion engine is operating at idle or at a low load, the valve element 17 is located in the fully closed position that closes the straight passage 14. At this time, all of the air-fuel mixture flows into the combustion chamber 2 through the helical passage 13, creating a strong intake swirl within the combustion chamber 2, which apparently increases the flame speed and increases the combustion speed. As a result, the combustibility of the air-fuel mixture is improved, and the internal combustion engine performs a good combustion operation without causing a misfire even at a low idle speed or when a lean air-fuel mixture is supplied. The load on the internal combustion engine increases,
Accordingly, when the intake pipe negative pressure decreases and becomes equal to or higher than a predetermined value t, the valve 1iJFi17 opens. At this time, the air-fuel mixture flows through both the helical passage 13 and the straight passage 14 and flows into the combustion chamber 2, so that the intake boat 3 no longer provides a large flow resistance to the flow of the air-fuel mixture in A decrease in filling efficiency is avoided.

FIG. 9 shows another embodiment of the apparatus used to carry out the method of the invention. In FIG. 9, parts corresponding to those in FIG. 8 are indicated by the same reference numerals as in FIG. In such an embodiment, conduits 30 and 32 are 11
The IWA on-off valve 37 selectively connects them to each other. The electromagnetic on-off valve 37 communicates and connects the conduits 30 and 32 when the coil 37a is energized, and connects the conduits 30 and 32 when the coil 37a is not energized.
Communication with 2 is cut off. coil 37
Electric current from a battery power source 38 is selectively supplied to a via an ignition switch 39 and a water temperature switch 43. The water temperature switch 43 is sensitive to the temperature of the cooling water of the internal combustion engine, and closes only when the temperature is below a predetermined value.

Therefore, in this embodiment, the diaphragm chamber 23 is connected to the suction pipe negative pressure take-out boat 33 in addition to the suction pipe Kakuda take-out port 28 during the intercalary period, and after warm-up is completed, the diaphragm chamber 23 is 23 is connected only to the intake pipe negative pressure take-out boat 28.

As a result, the same effects as those of the embodiment described above can be obtained in this embodiment.

Although the present invention has been described in detail with respect to specific embodiments in Part 1 above, it will be appreciated by those skilled in the art that the present invention is not limited thereto, and that various embodiments are possible within the scope of the present invention. It should be obvious.

[Brief explanation of the drawing]

FIG. 1 shows one embodiment of an intake boat structure to which the intake control I arrangement according to the present invention is applied. 8 and 9 are schematic configuration diagrams showing an embodiment of the intake control device according to the present invention. 1... Cylinder head, 2... Combustion chamber, 3... Intake bow 1., /l... Person L] open end, 5... Outlet 1
Open end, 6... Valve seat, 7... Intake valve, 8...
・Valve stem, 9...Valve retainer, 10...Guide vane, 11...Slanted wall part, 12...＾ Linear V part, 1
3...Help passage, 14...Straight passage, 1
5... Intake control valve assembly, 16... Valve case, 17
...Valve element, 18...Valve stem, 19...Drive lever, 20...Diaphragm device, 21...0tsudo. 22...Anorum to tie, 23...Dycephram chamber, 24...Compression, ]il spring, 25...Boat, 2
6.27...)'! ? '? , 28... Intake pipe negative pressure extraction port, 29... Throttle, 30... Conduit, 31...
・＋i! lI wet switching valve, 32... conduit. 33...Intake pipe negative pressure outlet bow 1-. 34... Valve element, 35... Bimetal, 36... Spring, 37...
Solenoid switching valve. 371...Coil, 38...Battery power supply, 39.
...Igutition switch, 40...Intake manifold. 41... Carburetor, 42... Throttle valve, 43
...Water temperature switch, 44...Exhaust port, 45...
・Exhaust valve. 46...Exhaust Manifold Patent Former Person Toyota Motor Corporation Representative Patent Attorney Masa Akashi
Tsuyoshi (self-button) Procedural amendments 1982 5741-10/13 Commissioner of the Japan Patent Office Kazuo Wakasugi 1, Indication of matter A'1 1982 sweat patent J1M No. 1050
18 No. 2, Name of R-Intake control device 3 of internal combustion engine, Correction of 110th section with person concerned 1 Patent applicant Location 1, I-Yota-cho, Toyota City, Aichi Prefecture Name (
320) l-=+Yu Jidosha Kogyo Co., Ltd. 4, Agent address: @104 Shinkawa 1-5ffi1, Chuo-ku, Tokyo
September Kayabacho Nagaoka Building 311J Telephone 551-41. ,
．． 716, supplement i [number of inventions increased by 07,
Target of correction Drawing

Claims (1)

[Claims] It has a helical passage that turns around an opening end to the combustion chamber and a straight passage that linearly communicates with the opening end, and the straight passage is located in the middle of the straight passage by 1fflW.
An intake control device for an internal combustion engine having an intake boat structure, which is provided with an intake control valve according to the second aspect of the invention, the intake control device having a fluid pressure working chamber, and controlling the intake air according to an increase in negative pressure acting on the fluid pressure working chamber. A fluid pressure actuator that drives the valve in the valve closing direction, a first intake pipe negative pressure take-out boat that is always located downstream of the throttle valve, and a throttle valve that is located downstream of the throttle valve when the throttle valve is in the idle tmi position. A second intake pipe negative pressure take-out boat located upstream of the valve when the valve is in a position opened from the idle rMrj1 position, and the fluid pressure working chamber are connected to the first intake pipe negative pressure take-off boat. passage means, when the warm-up degree of the internal combustion engine WIAΦ is below a predetermined value, the fluid pressure working chamber is connected to the second intake pipe negative pressure take-out boat; when the warm-up leakage is above a predetermined value, the fluid pressure working chamber is connected to the second intake pipe negative pressure take-out boat; Intake control with 11 III control valve separated from the second intake pipe negative pressure take-out boat
Place.