JPS60169628A - Internal-combustion engine - Google Patents

Abstract

PURPOSE:To reliably produce swirl and to perform lean combustion, by a method wherein a port, which sucks air in a tangential direction, is formed in a side wall in the vicinity of a bottom dead point within a cylinder, and the air is controlled in relative to an air-fuel ratio by means of a lean sensor. CONSTITUTION:A port 15, which sucks air in a cylinder, is formed in a side wall in the vicinity of a cylinder 4 having suction and exhaust valves 7 and 9 at its upper part. The port 15 is communicated with a suction pipe through a pipe 26, a control valve 20, and a reed valve 16, and a controller 30 controls a control valve 20 by means of an output from a lean sensor 31 located to an exhaust system so that proper lean air-fuel mixture is produced in a combustion chamber. This enables reliable production of swirl within the combustion chamber throughout a whole operation range, and permits maintenance of stable lean combustion.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to internal combustion engines, and in particular to an air supply system which is connected to the inner peripheral surface of a cylinder bore in order to directly supply additional air for air-fuel ratio control into a combustion chamber. Relating to an internal combustion engine that has a boat.

BACKGROUND OF THE INVENTION Conventionally, an internal combustion engine has an air supply boat that is open on the inner peripheral surface of a cylinder bore, and is configured such that additional air for controlling the air-fuel ratio is directly supplied into a combustion chamber from the air supply boat. One of the proposals is Japanese Unexamined Patent Publication No. 1983-202.
The disclosure was completed on the 28th day.

By the way, the combustion of the mixture of fuel and air in the combustion chamber is improved by having an air flow like a stool inside the combustion chamber, which increases the combustible air-fuel ratio of the mixture fed to the internal combustion engine. However, it becomes possible to further dilute the air-fuel mixture used to operate the internal combustion engine.

Purpose of the Invention The present invention provides a method for producing a swirl-like air flow in the combustion chamber by additional air directly supplied into the combustion chamber for air-fuel ratio control from an air supply boat installed on the inner circumferential surface of the cylinder bore. It is an object of the present invention to provide an improved internal combustion IafIl which can be operated better with a leaner mixture due to improved combustion of the mixture.

Structure of the Invention According to the present invention, the air supply bow 1~ opened on the inner circumferential surface of the cylinder bore is opened, and additional air for controlling the air-fuel ratio is supplied into the combustion chamber from the air supply bow 1~. In a direct-fed internal combustion engine, the air supply boat opens substantially tangentially to the inner peripheral surface of the cylinder bore.
This is achieved by an internal combustion engine such as the one shown in Figure 1.

Effects of the Invention According to the above-described configuration, the additional air for controlling the air-fuel ratio that is directly supplied into the combustion chamber from the air supply boat causes a good swirl around the axis of the combustion chamber, which causes Combustion of the air-fuel mixture is improved, and the internal combustion engine can be operated with an even leaner air-fuel mixture.

DESCRIPTION OF EMBODIMENTS The invention will now be described in detail with reference to embodiments, with reference to the accompanying drawings.

1 and 2 show one embodiment of an internal combustion engine according to the invention. In these figures, reference numeral 1 indicates an engine main body composed of a cylinder block 2 and a cylinder head 3. The cylinder block 2 receives a piston 5 in its cylinder bore 4 so as to be movable in the vertical direction as shown in the figure, and defines a combustion chamber 6 above the piston in cooperation with the cylinder head 3.

The cylinder head 3 has an intake boat 8 which is opened and closed by an intake valve 7 and an exhaust boat 1 to 10 which is opened and closed by an exhaust valve 9.
and is provided. The intake bow 1-8 is connected to a carburetor 12 by an intake manifold 11, from which a mixture of fuel and air is supplied while being controlled by a throttle valve 13.

The cylinder block 2 is provided with air supply bows 1 to 15 that open on the inner peripheral surface of the cylinder body 74 and communicate with the combustion chamber 6. The air supply bore h 15 extends substantially tangentially to the inner circumferential surface of the cylinder bore 4, as best seen in FIG.

The air supply boat 15 is communicatively connected to a boat 17 of a -h direction valve 16 of a reed valve type. -I) Direction valve 16 is bow 1
The boat 18 is configured to allow air to flow only toward the bows 1-17 from the boat 18, and the boat 18 is connected to the bows 1-21 of the tti magnetic control valve 20 by a conduit 19. The electromagnetic control valve 20 has a valve element 25 driven by an electromagnetic coil 23 and a spring 24. When the electromagnetic coil 23 is not energized, the valve element 25 is rotated by the spring force of the spring 24. When the valve element 25 moves to 1 force, the communication between the ribs 1 to 21 and the valve h 22 is cut off.On the other hand, when the electromagnetic coil 23 is energized, the valve element 25 resists the spring force of the spring 24. By moving to the lower blade in the figure, communication is established between boats 21 and 22. Boat 22 is connected in communication to air intake boat 27 by conduit 26.

The electromagnetic coil 23 of the electromagnetic control valve 20 is energized by an electric control device 30 such as a micro-inverter. The control device 30 is given information from the exhaust manifold 14 to determine the amount of oxygen m in the exhaust gas from the exhaust manifold 14.
When the amount of oxygen in the exhaust gas is below a predetermined value, that is, the combustion chamber 6
The air-fuel ratio of the mixture combusted at is a predetermined value, for example, 20 to 2.
In other words, when the mixture burnt in the combustion chamber 6 is richer than a predetermined value, the electromagnetic coil 23 is energized; otherwise, the electromagnetic coil 23 is energized.
The device is designed to stop energizing the device.

As described above, by controlling the current supply to the electromagnetic coil 23 of the electromagnetic control valve 20, when the air-fuel ratio of the mixture combusted in the combustion chamber 6 is smaller than a predetermined value, the boats 21 and 2
2 is established, and the piston 5 moves from the top dead center position toward the F dead center position during the intake stroke () into the combustion chamber 6! Air taken in from the air intake port 27 by the negative silicon oxide is ejected from the air supply boat 15 into the combustion chamber 6.

Since the air supply boat 15 is substantially tangential to the inner peripheral surface of the cylinder bore 4 in the 1 m direction, the air from the boat flows out in the tangential direction of the cylinder bore 4, and the air from the boat flows out in the tangential direction of the cylinder bore 4. By flowing within the combustion chamber θ while being guided by the circumferential surface, a swirl is generated in the combustion chamber 6 around the central axis of the cylinder bore 4 .

As mentioned above, the additional air for controlling the air-fuel ratio supplied from the air supply boat 15 into the combustion chamber 6 creates a relatively strong swirl in the combustion chamber 6, which improves the combustibility of the air-fuel mixture in the combustion chamber. This has been improved and enables operation with a leaner air-fuel mixture than before.

In the above-described embodiment, the solenoid control valve 20 is an open/close type, but the solenoid control valve can vary the degree of communication between the -C boats 21 and 22 depending on the current value given to the electromagnetic coil. It is a linear control type that controls - C is also good, and in this case, when the lean sensor 31 does not detect the amount of oxygen in the exhaust gas at a predetermined level of 110 or more, the electromagnetic ``Ile 23'' is activated.
It suffices if the current value to be applied is increased.

Although the present invention has been described in detail with respect to specific embodiments above, the present invention is not limited thereto.
It will be apparent to those skilled in the art that various embodiments are possible within the scope of the invention.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of an internal combustion engine according to the present invention, and FIG. 2 is an i-plane view taken along plug n-u in FIG. '1... Internal combustion engine, 2... Cylinder knob [knock, 3
... Cylinder head, 4... Cylinder head j7, 5.
··piston. 6... Combustion chamber, 7 River intake valve, 8... Intake valve 1-1
9...Exhaust valve, 10...Exhaust bow 1-, '11...
・Intake manifold, 12... Carburetor, 13... Stainless steel valve. 14...Exhaust manifold, 1E5...Air supply boat. 1, 6...One-way valve, 17,'18...Boe 1-.
19... Conduit, 20... Solenoid control valve, 2'l, 22
... Boat, 23 ... Electromagnetic coil, 24 ... Spring, 25 ... Valve element, 26 ... Conduit, 27 ... Air intake boat +-, 30 ... Control device, 31 ...LeanSenso patent applicant Toyota Motor Corporation attorney - Akira B. Takeshi Masaru

Claims (1)

[Claims] In an internal combustion engine that has an air supply boat opening on the inner circumferential surface of the cylinder bore, and in which additional air for controlling the air-fuel ratio is directly supplied into the combustion chamber, the air supply boats 1 to 1 are connected to the cylinder bore. An internal combustion engine characterized in that the opening is substantially tangential to the inner peripheral surface of the engine.