JPS6137816Y2 - - Google Patents

Description

[Detailed description of the invention] This invention aims to reduce the amount of exhaust gas in internal combustion engines.
This invention relates to a device that introduces exhaust gas to reduce NOx and air to stabilize combustion during sudden deceleration or restart of an engine into an intake manifold.

In recent engines, part of the exhaust gas is recirculated to the intake system in order to reduce NOx in the exhaust gas, and when the engine suddenly decelerates, the intake negative pressure sharply increases to mix the exhaust gas. If the mixture becomes too rich, and when the engine is restarted, the mixture will become richer due to the intake of gasoline vapor that has accumulated in the intake manifold or the intake system upstream of the carburetor when the engine is stopped. Air is introduced into the intake system during sudden deceleration or restart. However, in the past, these combustion control fluids were introduced directly through ports provided in the intake manifold, so the combustion control fluids were introduced into the intake manifold at a relatively high speed and with constant directionality. This not only disturbs the flow of the intake air-fuel mixture in the intake manifold, but also causes uneven flow to specific cylinders, resulting in uneven distribution of combustion control fluid to each cylinder.

The present invention introduces recirculated exhaust gas and air into the intake manifold, and the combustion control fluid is once introduced into a chamber, the flow velocity and directionality are reduced within the chamber, and then introduced into the intake manifold along with the air mixture flow. This method solves the above-mentioned inconvenience, and its gist is that a chamber that opens into the intake manifold is provided at the collecting part of the intake manifold that guides the air-fuel mixture from the carburetor to the cylinders of the engine; , a port for recirculating exhaust gas to the intake manifold and a port for introducing air into the intake manifold when the engine suddenly decelerates or restarts the engine, and these ports are opened opposite each other. The configuration is such that the

Embodiments of the present invention will be described below with reference to the drawings. In the drawings, reference numeral 1 indicates a multi-cylinder engine having a first cylinder 2 and a second cylinder 3; 4 indicates an intake manifold attached to the side of the engine 1; Intake manifold 4
A two-barrel carburetor 6 having a primary side 7 and a secondary side 8 is mounted on the upper surface of the gathering part 5, with the secondary side 8 located close to the engine and the primary side 7 located far away. The intake pipes 9 and 10 that branch from the collecting portion 5 are connected to the intake ports 11 and 10 in each cylinder 2 and 3 of the engine 1, respectively.
12, respectively.

13 is a collection part 5 in the intake manifold 4
, a chamber 13 is provided laterally so as to open into the chamber 13 , and the chamber 13 is preferably a chamber 13 that is opened into the chamber 13 .
It is located at the lower part of the primary side 7 in the chamber 13, and is configured so that the intake air mixture from the primary side 7 flows past the opening of the chamber 13.

The chamber 13 has two ports 1
4 and 15 are bored so that both ports 14 and 15 open opposite each other, and one port 1
4 is connected to an exhaust gas recirculation passage 17 from an exhaust gas recirculation control device 16, and the other port 15 is connected to an air supply passage 19 from an air control device 18 for supplying air when the engine suddenly decelerates or restarts the engine. They are connected to each other.

In this way, a chamber 13 that opens into the collecting part 5 of the intake manifold 4 is provided, and a port 14 for recirculating exhaust gas to the intake manifold 4 is provided in the chamber 13, and a port 14 is provided in the chamber 13 for recirculating exhaust gas to the intake manifold 4. These two ports 1 and 15 are for introducing air into the intake manifold 4 during startup, etc.
4 and 15 so that they open opposite each other, when the exhaust gas is recirculated to the intake manifold 4 in the normal operating range of the engine,
The exhaust gas that has flown into the chamber 13 from the port 14 once flows into the other port 15 opposite to the port 14 and the flow direction is reversed, thereby rapidly reducing the velocity energy of the exhaust gas. Furthermore, the flow velocity of the exhaust gas is further reduced in the chamber 13, and the flow velocity becomes sufficiently slow to be introduced into the intake manifold 4 without directivity. , air introduced from port 15 when the engine suddenly decelerates or restarts the engine.
By flowing into one port 14 opposite to the port 15 and changing the flow direction to the opposite direction, the velocity energy of the air can be rapidly reduced, and the air has a further flow velocity within the chamber 13. As a result, the flow velocity becomes sufficiently slow and the air is introduced into the intake manifold 4 in a state where there is no directionality.

As described above, according to the present invention, when exhaust gas is recirculated to the intake manifold and air is supplied during sudden deceleration or restart of the engine, a chamber is provided at the gathering part of the intake manifold, and the chamber is provided inside the chamber. A port for recirculating exhaust gas to the intake manifold and a port for introducing air into the intake manifold when the engine suddenly decelerates or restarts the engine are arranged so that these two ports face each other. By opening the exhaust gas and air into the intake manifold, it is possible to introduce the exhaust gas and air into the intake manifold in a state where the flow velocity is sufficiently slow and there is no directionality of flow. This allows the exhaust gas and air to have a relatively high flow velocity and constant directionality to avoid being introduced into the intake manifold. can be widely dispersed, and
This does not disturb the flow of the intake air mixture in the intake manifold.

As a result, according to the present invention, the exhaust gas and air to the intake manifold can be distributed substantially uniformly to each cylinder in the engine, and the exhaust gas and air impair the distribution of the intake air-fuel mixture to each cylinder. Therefore, the effect of exhaust gas recirculation and the effect of air supply during sudden deceleration or restart of the engine can be achieved reliably and stably, and the combustion state of each cylinder is approximately equal, resulting in output. This eliminates variations in the engine speed, which has the effect of improving the drivability of the engine.

Furthermore, by opening the exhaust gas recirculation port and the air supply port opposite each other, both ports can be drilled at once, reducing the cost required for processing. It also has the effect of

Note that if the chamber 13 is provided at a lower position on the primary side 7 of the carburetor 6, the intake air mixture from the primary side 7 will flow past the opening of the chamber 13, and the flow of this air mixture will cause the exhaust gas to flow. and air suction effect can be expected.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a plan view, FIG. 2 is a sectional view taken from the side of FIG. 1, FIG. 3 is a sectional view taken from the side of FIG. of-
FIG. 1... Engine, 4... Intake manifold, 5...
Collection part, 6... vaporizer, 13... chamber, 1
4, 15...port, 17...exhaust gas recirculation passage, 19...air supply passage.

Claims (1)

[Scope of utility model registration request] A chamber that opens into the intake manifold is provided at the collecting part of the intake manifold that guides the air-fuel mixture from the carburetor to the cylinders of the engine, and within the chamber there is a port for returning the exhaust gas to the intake manifold, and a port for rapidly decelerating the engine. Introduction of a combustion control fluid into an internal combustion engine, characterized in that a port for introducing air into the intake manifold when restarting the engine or the like is provided such that both ports open opposite each other. Device.