JPH11132037A - Exhaust emission control device for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the discharge of various kinds of harmful substances immediately after the cold-starting of an engine. SOLUTION: Between an exhaust manifold or an exhaust pipe 1 connected to the exhaust manifold and a catalyst holding part 3 in which a catalyst 2 is arranged and fixed, a valve stem 6, the axis of rotation of which is set at a position on the wall face 5, is provided in a catalyst container-front chamber 4 extending from the exhaust manifold or the outlet part of the exhaust pipe and connected to the front end of the catalyst holding part, and further an exhaust gas inflowing area control valve 8, the other end part of which is turned around the valve stem through a circular- arc path A and which controls the exhaust gas inflowing area of an exhaust gas inflowing surface 7 of the catalyst, is arranged. When an engine is in cold-period, the control valve is stopped at a position at which the exhaust gas inflowing area of the catalyst is narrowed, and when the exhaust gas generated after starting the engine, is intensively supplied, and the temperature at a catalyst part 9 rises to the temperature at which the catalytic effect can be sufficiency obtained, an automatic opening and closing device which slowly moves the control valve in the fully opened direction, is loaded to the valve stem.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas purifying apparatus for reducing harmful substances such as carbon monoxide, hydrocarbons and nitrogen oxides contained in exhaust gas of an internal combustion engine.

[0002]

2. Description of the Related Art Conventionally, in an exhaust gas purifying apparatus for reducing various harmful substances contained in exhaust gas of an internal combustion engine, a catalyst is disposed inside and fixed to an exhaust manifold in an exhaust system or an exhaust pipe connected to the exhaust manifold. The exhaust gas is supplied and passed through the entire exhaust gas inflow surface of the catalyst to reduce the amount of various harmful substances contained in the exhaust gas.

[0003]

However, if the catalyst does not reach a certain temperature, its catalytic effect cannot be sufficiently obtained, and therefore, the amount of emission of various harmful substances immediately after starting the engine at the time of engine cooling is limited to once per vehicle. Most of the emissions that are emitted during traveling are released to the atmosphere.

[0004] The present invention has been made in view of the above points, and an object of the present invention is to provide an exhaust gas purifying apparatus for further reducing the emission of various harmful substances immediately after the engine is started when the engine is cold.

[0005]

In order to solve the above-mentioned problems, the invention according to claim 1 is characterized in that an exhaust manifold or an exhaust pipe connected to the exhaust manifold and a catalyst are disposed inside the catalyst holding portion where the catalyst is disposed and fixed. A catalyst container front chamber formed so as to be connected to the front end of the catalyst holding portion from the outlet portion of the exhaust manifold or the exhaust pipe, a position on one end portion in an exhaust gas upstream direction and on a wall surface side in the catalyst container front chamber. A valve shaft having a rotation center set at the other end is provided, and the other end is maintained at a distance such that the other end does not contact the surface of the exhaust gas inflow surface of the catalyst while the arc orbit A is moving around the valve shaft. An exhaust gas inflow area control valve that controls the exhaust gas inflow area of the inflow surface by moving in a fan shape about the valve shaft as a center of rotation is disposed, and the exhaust gas inflow area control valve is provided when the engine is cold. Stop at the position where the exhaust gas inflow area on the exhaust gas inflow surface of the catalyst is reduced, and after the engine starts, the temperature at which the exhaust gas generated by the rotational movement of the engine is intensively supplied and through which the catalytic effect can be sufficiently obtained at the catalyst portion When the temperature rises, an automatic opening / closing device for gradually moving the exhaust gas inflow area control valve in the fully open direction is mounted on the valve shaft.

[0006]

When the engine equipped with the exhaust gas purifying device configured as described above is started in a cold state, the engine is mounted on the valve shaft of the exhaust gas inflow area control valve which senses the temperature of the catalyst and the catalyst container body in the cold state. The automatic opening / closing device stops the exhaust gas inflow area control valve at a position where the exhaust gas inflow area of the exhaust gas inflow surface of the catalyst is reduced. Therefore, after the engine is started, most of the exhaust gas discharged from the engine is concentrated and flows in the direction along the exhaust gas inflow area control valve, and is concentrated and supplied to a part of the exhaust gas inflow surface of the catalyst. A part of the catalyst supplied with concentrated exhaust gas has a longer heating time until reaching a temperature at which a catalytic effect can be obtained, compared with a part of the catalyst where almost no exhaust gas is supplied due to the heat of the exhaust gas that has passed one after another. Shorten. Therefore, the start time of the exhaust gas purifying operation is advanced.

Further, a portion of the catalyst to which the exhaust gas generated by the subsequent rotational movement of the engine is supplied in a concentrated manner performs the purifying action of the exhaust gas and keeps the surroundings of the catalyst warmed by the heat transfer action, so that the heated catalyst surrounding portion When the temperature rises to a temperature at which the catalytic effect can be obtained, the exhaust gas inflow area control valve starts to open gradually by the automatic opening / closing device that sets the start movement timing so that the exhaust gas inflow area control valve starts to open gradually. Gradually increase the exhaust gas inflow area of the exhaust gas inflow surface. Then, the exhaust gas is supplied to the exhaust gas inflow surface of the expanded catalyst, and the catalyst portion around the catalyst to which the exhaust gas is first supplied in a concentrated manner efficiently purifies the passing exhaust gas. With the subsequent engine rotation movement, the surrounding catalyst is further heated by the same heat transfer function, and the above-described purification action is repeated in the same manner. Then, when the temperature of the entire catalyst rises to a temperature at which a catalytic effect can be obtained by the subsequent rotation of the engine, the exhaust gas inflow area control valve retreats to the wall surface side in the front chamber of the catalyst container and is fully opened, and the entire exhaust gas inflow surface of the catalyst Exhaust gas is supplied to the catalyst, and the entire catalyst performs an exhaust gas purifying action.

Finally, when the engine is stopped, when the temperature of the catalyst and the body of the catalyst container becomes lower than the set temperature by the automatic opening / closing device mounted on the valve shaft, the exhaust gas inflow area control valve starts to be closed, and the exhaust gas of the catalyst is exhausted. It is moved in a direction to reduce the exhaust gas inflow area on the inflow surface. When the temperature of the catalyst or the catalyst container body further decreases, the exhaust gas inflow area control valve has projections provided at both ends on opposite sides of the valve shaft of the exhaust gas inflow area control valve. The exhaust gas inflow area control valve is stopped at the position where the exhaust gas inflow area on the exhaust gas inflow surface of the catalyst is most narrowed.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic structural explanatory view of an embodiment according to the first aspect of the present invention. In FIG. 1, a catalyst having a square exhaust gas inflow surface is used as a catalyst. This shows the direction in which the exhaust gas flows. In FIG. 1, at a position between an exhaust manifold or an exhaust pipe 1 connected to the exhaust manifold and a catalyst holding portion 3 in which a catalyst 2 is arranged and fixed inside, at an exhaust manifold or at an outlet portion of the exhaust pipe 1 connected to the exhaust manifold, An outlet portion of the exhaust pipe 1 has a circular cross section from the circular shape to the front end of the catalyst holding portion 3 and is formed in a catalyst container front chamber 4 formed in a pyramid shape. A valve shaft 6 having a rotation center set at a position on the side of the wall surface 5 in the chamber 4 is provided.
The other end keeps an interval that does not contact the surface of the exhaust gas inflow surface 7 of the catalyst 2 during the movement of the circular orbit A around the valve shaft 6 as a rotation center, and the exhaust gas inflow area of the exhaust gas inflow surface 7 of the catalyst 2 An exhaust gas inflow area control valve 8 for controlling the valve shaft 6 by moving it in a fan shape around the center of rotation is provided. When a lip-shaped spoiler is formed at the tip of the exhaust gas inflow area control valve 8, the exhaust gas flow can be easily controlled. Further, if a balancer that balances with the exhaust gas inflow area control valve 8 is mounted on the opposite side of the valve shaft 6, the position of the exhaust gas inflow area control valve 8 during the opening / closing process can be easily maintained. The exhaust gas inflow area control valve 8 is located inside the catalyst container front chamber 4 with respect to the valve shaft 6 so that the high temperature exhaust gas flow does not directly hit the valve shaft 6. It is good to arrange and attach in such a way.

When the engine is cold, the exhaust gas inflow area control valve 8 is stopped at the stop position shown in FIG. 1 at a position where the exhaust gas inflow area of the exhaust gas inflow surface 7 of the catalyst 2 is reduced. When the exhaust gas generated by the rotation of the engine is intensively supplied and the temperature of the catalyst portion 9 rises to a temperature at which the catalytic effect can be sufficiently obtained by the heat of the passed exhaust gas, the exhaust gas inflow area control valve 8 is fully opened. The automatic opening / closing device 10 for gradually moving in the direction was mounted on the valve shaft 6. In this embodiment of the automatic opening and closing device 10,
A bimetallic coil-shaped automatic opening / closing device in which two metals having different coefficients of thermal expansion are bonded to each other is adopted, the center of the coil is fixed to the end of the valve shaft 6, and at the outermost end of the coil outer periphery, Attached to the exhaust pipe 1, the catalyst container front chamber 4, and an outer portion of the main body of the catalyst holding unit 3 and the like, and not shown in FIGS. Is entirely covered with a case so as not to be affected by the outside air temperature. When the temperature of the catalyst portion 9 rises to a temperature at which the catalytic effect can be sufficiently exerted, the heat is transmitted from the fixed portion 11 at the outermost end of the coil and the heat transmitted from the valve shaft 6, and the bimetal coil-shaped automatic opening and closing is performed. The device 10 starts to move, and gradually moves the exhaust gas inflow area control valve 8 in the fully open direction. Furthermore, not limited to this embodiment,
For example, a water temperature, a signal from a thermometer mounted at an appropriate position in a catalyst container in a front chamber or a rear chamber sandwiching a catalyst, an inside of a catalyst body, or the like is received by a vehicle-mounted computer, and the signal is transmitted to the above-described exhaust gas inflow. Automatic opening / closing device that opens and closes the exhaust gas inflow area control valve with a servo motor and link cage under the direction of a computer when the area control valve opening / closing drive condition is satisfied, and to measure the stability of the engine rotation after starting the engine when the engine is cold It is also conceivable to employ an automatic opening and closing device that opens and closes the exhaust gas inflow area control valve in conjunction with the idle-up mechanism.

Also, the valve shaft 6 of the exhaust gas inflow area control valve 8
When the length L in the exhaust gas flow direction between the tip of the exhaust gas inflow area control valve 8 and the tip of the exhaust gas inflow area control valve 8 is set to be large, the circular arc trajectory A of the tip of the exhaust gas inflow area control valve 8 having the valve shaft 6 as the center of rotation is made flat. The distance between the circular arc orbit A drawn by the valve tip of the exhaust gas inflow area control valve 8 and the exhaust gas inflow surface 7 of the catalyst 2 cut in a plane is reduced, so that the exhaust gas flow is controlled. Cheap. In addition, when a catalyst having a rectangular or elliptical exhaust gas inflow surface shape is employed, if the valve axis direction is set and arranged in the same direction as the long axis direction of the exhaust gas inflow surface, the exhaust gas inflow surface will be in the same direction as the short axis direction. Compared to the case where the valve shaft direction is set and arranged,
When the exhaust gas inflow area control valve tip moves the same distance, the operating angle of the exhaust gas inflow area control valve becomes narrower,
The circular orbit at the tip of the exhaust gas inflow area control valve centered on the valve shaft can be made closer to a plane. Therefore, as in the case described above, the circular orbit drawn by the valve tip of the exhaust gas inflow area control valve can be made closer to a plane, and the interval between the exhaust gas inflow surfaces of the catalyst cut in a plane can be narrowed. Therefore, it is easy to control the exhaust gas flow. Further, as shown in the embodiment of FIG. 3, a part 1 of the exhaust gas inflow surface 15 of the catalyst 14 at a position corresponding to the arc-shaped orbit C at the tip of the exhaust gas inflow area control valve 12.
6 can be substantially prevented by forming a concave arcuate surface so as to keep a constant distance between the two.

The exhaust gas inflow area control valve 8 shown in FIG. 1 moves around the valve shaft 6 in the catalyst chamber front chamber 4 so that the tip of the exhaust gas inflow area control valve 8 draws on the circular orbit A. I do. In the case where a catalyst having a square or rectangular prism is employed as the exhaust gas inflow surface of the catalyst as in the present embodiment, the fourth
As shown in the figure, the radially opposite side portions 17A and 17B of the exhaust gas inflow area control valve 8 do not come into contact with the respective opposite side surfaces 18A and 18B of the catalyst container front chamber 4 at least at the time of closing and at the time of full opening. The width between the opposed opposite side surfaces 18A and 18B of the catalyst container front chamber 4 is ensured. Therefore, when the opposite side surfaces 18A and 18B of the catalyst container front chamber 4 are set to a simple plane, the exhaust gas inflow area control valve 12 has the exhaust gas inflow at the position closest to the catalyst. The gap between the radially opposite side portions 17A and 17B of the area control valve 8 and the respective opposite side surfaces 18A and 18B of the catalyst container front chamber 4 is maximized. It is also conceivable that a catalyst whose exhaust gas inflow surface has a circular or elliptical shape is employed.
In accordance with the conical movement area having the apex on the valve shaft on both sides in the radial direction of the exhaust gas inflow area control valve, the opposed both side surfaces of the front chamber of the catalyst container are also disposed on the valve shaft at a constant interval. What is necessary is just to set to the conical shape which has a vertex. Needless to say, even when a catalyst having a square or rectangular square shape is employed as the exhaust gas inflow surface of the catalyst described above, the shapes of the opposed both side surfaces 18A and 18B of the catalyst container front chamber 4 are apexed on the valve shaft. May be set to a conical shape having Therefore, both side portions 17A and 17B in the radial direction of the exhaust gas inflow area control valve 8 are provided.
The exhaust gas flow can be prevented from leaking, and the exhaust gas flow can be intensively supplied to a portion 9 of the catalyst 2 shown in FIG. If the interval between the radially opposite side portions 17A and 17B of the exhaust gas inflow area control valve and the opposite side surfaces 18A and 18B of the catalyst container front chamber is set to be relatively large, a part of the exhaust gas flow is reduced. The exhaust gas flows into the back side of the control valve and preheats the catalyst portion on the back side of the exhaust gas inflow area. Further, as shown in the embodiment of FIG. 5 and the embodiment of FIG. A communication hole 19 through which the exhaust gas flow communicates between the two spaces sandwiching the control valve.
If the A, 19B, 19C and the slit 20 are provided in the exhaust gas inflow area control valve, the exhaust gas flow passes through the communication holes 19A, 19B, 19C and the slit 20 and flows into the catalyst behind the exhaust gas inflow area control valve. This serves to warm the catalyst in this portion in advance. Furthermore, when a catalyst having an exhaust gas inflow surface having a circular or elliptical shape is employed, the front chamber of the catalyst container may be formed into a conical shape or an elliptical cone shape in accordance with the shape of the exhaust gas inflow surface of the catalyst. Then, the exhaust gas flows from both sides in the radial direction of the exhaust gas inflow area control valve to the back side of the exhaust gas inflow area control valve, and the exhaust gas flows into the catalyst on the back side of the exhaust gas inflow area control valve, and the catalyst portion on the back side of the valve. 7 and lip-shaped spoilers 22A and 22B are formed on both sides in the radial direction of the exhaust gas inflow area control valve 21 as in the embodiment of FIG. Current plate 23 on the surface side
The provision of A and 23B makes it easier to control the direction of the exhaust gas flow. The lip-shaped spoiler, the current plate and the like may be provided alone or in combination.

The exhaust gas inflow area of the catalyst which is not blocked by the exhaust gas inflow area control valve at the time of engine cooling in each of the embodiments described in the claims and the embodiments is as follows.
At least immediately after the start of the engine, an opening area is ensured so that the engine does not stop due to an increase in exhaust pressure or the like. The area and shape of the exhaust gas inflow area control valve that closes a part of the exhaust gas inflow surface of the catalyst, the arrangement position of the valve shaft, the standby position when the engine is cold, the setting of the valve opening and closing timing of the automatic opening and closing device, and the like. Further, a method of concentrating and supplying the exhaust gas flow to a part of the exhaust gas inflow surface of the catalyst, and controlling the exhaust gas inflow area by diverting a part of the exhaust gas flow to the back side of the exhaust gas inflow area control valve In the selection of a method of supplying exhaust gas to the catalyst on the back side of the valve and pre-warming the catalyst in this part, etc., the engine displacement, the air-fuel ratio, the exhaust gas temperature when flowing into the catalyst, and further, Of course, the determination is made in consideration of various conditions such as the purification ability of the catalyst, the purification start temperature of the catalyst, and the type of vehicle on which the engine is mounted.

The shape of the position of the exhaust gas inflow area control valve and the position of the catalyst vessel front chamber that are opposed to each other can be such that the exhaust gas can smoothly flow in and when the exhaust gas inflow area control valve is fully opened, It is formed in a shape that can be stored in conformity with the wall surface side of the front chamber.

Further, in the above-described embodiment, the exhaust gas inflow area control valve is disposed in the catalyst container front chamber, and the exhaust gas inflow area control valve is located in the exhaust gas upstream direction and on the wall surface side in the catalyst container front chamber. The valve shaft is set to a shape that keeps an interval that does not come into contact with the exhaust gas inflow surface of the catalyst body while the circular orbit is moving around the valve shaft as a rotation center. As described above, the position of the valve shaft 25 of the exhaust gas inflow area control valve 24 is disposed immediately before the exhaust gas inflow surface 27 of the catalyst 26, and when the engine is cold,
Since the exhaust gas inflow area control valve 24 prevents supply of the exhaust gas flow to the portion 28 of the catalyst 26 having the exhaust gas inflow surface 27, the portion 2 of the catalyst 26 having the exhaust gas inflow surface 27
When the inlet portion of the fuel cell 8 is closed and the temperature of the unblocked catalyst portion rises to a temperature at which a catalytic effect can be sufficiently obtained by the heat of the exhaust gas passing through, the exhaust gas inflow area control valve starts to open,
The exhaust gas inflow area control valve 24, which is moved to the position 30 of the exhaust gas inflow area control valve shown by the dotted line in the drawing and is arranged in parallel with the exhaust gas flow and the exhaust gas inflow surface 27 is fully opened, is moved forward of the catalyst container. An embodiment in which the catalyst 26 is disposed in the chamber 29 is also conceivable. In this embodiment, the shape of the exhaust gas inflow surface 27 of the catalyst 26 is suitably circular or elliptical, and therefore, the shape of the catalyst container front chamber 29 is formed in a semicircular or elliptical spherical shape. I do.

Also, as shown in FIGS. 9 and 10, when increasing the exhaust efficiency in a multi-cylinder engine, or when adopting a V-type or horizontal counter-type cylinder arrangement, several cylinders are combined in an exhaust manifold. After two more exhaust pipes 31
A catalyst container front chamber 33 formed in front of a catalyst container in which a catalyst 32 having an exhaust gas outflow surface shape such as a rectangle or an ellipse is fixed inside and an outlet portion of the two exhaust pipes 310 are connected. In the embodiment in which the exhaust gas inflow area control valve 35 for controlling the exhaust gas inflow area of the exhaust gas inflow surface 34 of the catalyst 32 in the catalyst container front chamber 33, the exhaust gas inflow area control valve 35 When an elliptical protrusion 36 whose side surface is half-moon-shaped as shown in FIG. 9 and whose plane is deformed as shown in FIG. The exhaust gas discharged from the engine at the time of collision with the closed exhaust gas inflow area control valve 35 flows along the exhaust gas inflow area control valve 35 and is provided at the exhaust gas inflow area control valve 35 at the same time. Exhaust gas converges on the projections 36 and can be concentrated and supplied to a specific portion of a certain portion of the exhaust gas inflow surface 34 of the catalyst. Therefore, the temperature rise rate of the specific portion is increased, and the exhaust gas is purified. Faster onset of action

Further, when a plurality of catalysts are arranged in series in the catalyst container, a space chamber is provided between the catalyst at the front position and the catalyst at the rear position, which is discharged from the exhaust gas outflow surface of the catalyst at the front position. In order to allow the exhausted gas to smoothly enter the exhaust gas inflow surface of the catalyst at the rear position, the exhaust gas inflow to control the exhaust gas inflow area of the exhaust gas inflow surface of the catalyst in the catalyst container front chamber. In the embodiment in which the area control valve is arranged, a partition plate may be provided at a position in the space where the tip of the exhaust gas inflow area control valve at the time of engine cold is projected on the catalyst exhaust gas inflow surface at the rear position.

The invention described in claim 1 and the third invention
As shown in the embodiment of the drawing, a portion 16 of the exhaust gas inflow surface 15 of the catalyst 14 at a position opposite to the circular orbit C at the tip of the exhaust gas inflow area control valve 12 is formed in a concave shape so that the two always maintain a constant interval. A communication method in which the exhaust gas flow communicates between the two spaces sandwiching the exhaust gas inflow area control valve in the catalyst container front chamber, as in the method of forming an arcuate surface, or in the embodiment of FIG. 5 or the embodiment of FIG. A method in which the holes 19A, 19B, 19C and the slits 20 are provided in the exhaust gas inflow area control valve is employed.
An embodiment in which the flow direction of the exhaust gas of the described invention is set to the opposite direction is also conceivable.

According to the present invention, the following effects are obtained as a result of employing the exhaust gas purifying apparatus configured as described above.

According to the first aspect of the present invention, when the engine starts to be started when the engine is cold, the exhaust gas inflow area control valve is controlled by the automatic opening / closing device which senses the temperature of the catalyst and the catalyst container body when the engine is cold. It stops at a position where the exhaust gas inflow area on the exhaust gas inflow surface is reduced. Therefore, the exhaust gas discharged from the engine is intensively flowed along the exhaust gas inflow area control valve, is intensively supplied to a part of the exhaust gas inflow surface of the catalyst, and is a part of the intensively supplied catalyst. The temperature rises quickly to a temperature at which a catalytic effect can be obtained as compared with the other catalyst parts due to the heat of the exhaust gas that has passed. Therefore, the purification action of the exhaust gas starts early. Further, while the flow of the exhaust gas is regulated by the exhaust gas inflow area control valve, the exhaust pressure is increased, the blow-by of the air-fuel mixture in the combustion chamber of the engine can be reduced, and the torque at a low speed is increased. Further, a part of the catalyst which is centrally supplied by the centralized supply of the exhaust gas discharged by the subsequent engine rotation performs the purifying action of the exhaust gas, keeps the surrounding area of the catalyst heated by the heat transfer function, and keeps the surrounding area of the catalyst kept warm. When the temperature of the portion rises to a temperature at which the catalytic effect can be obtained, the exhaust gas inflow area control valve gradually starts to open by the automatic opening / closing device that sets the start movement timing so that the exhaust gas inflow area control valve starts to open gradually. Gradually increase the exhaust gas inflow area of
Exhaust gas is supplied to the expanded exhaust gas inflow surface of the catalyst, and the exhaust gas passing therethrough is efficiently purified by the catalyst heated to a temperature at which a catalytic effect is obtained. In the subsequent engine rotation, the surrounding catalyst is also heated by the same heat transfer function, and the same purification action is repeated. Then, when the temperature of the entire catalyst rises to a temperature at which the catalytic effect can be obtained by the subsequent rotational movement of the engine, the exhaust gas inflow area control valve retreats toward the wall side in the front chamber of the catalyst container and is fully opened, so that the entire exhaust gas inflow surface of the catalyst becomes full. Exhaust gas is supplied to the catalyst, and the entire catalyst performs an exhaust gas purifying action.

If a part of the catalyst on the side of the exhaust gas inflow surface, which is opposite to the arc orbit at the tip of the exhaust gas inflow area control valve, is formed in a concave arcuate surface so as to keep a constant distance between them. Leakage of the exhaust gas flow can be prevented, and if a communication hole or slit is provided in the exhaust gas inflow area control valve, the exhaust gas flow passes through the communication hole or slit and flows to the catalyst behind the exhaust gas inflow area control valve. This serves to preheat the catalyst part. Further, lip-shaped spoilers are formed on both sides in the radial direction of the exhaust gas inflow area control valve. When the exhaust gas inflow area control valve is closed, the end of the spoiler has a conical shape. If the shape is adapted to the inner wall surface of the chamber, the exhaust gas flow direction can be easily controlled when the exhaust gas inflow area control valve is closed, and almost the entire amount of the exhaust gas flow can be supplied to the catalyst portion. In the selection and combination of each of the above-described embodiments, the engine displacement, the air-fuel ratio, the exhaust gas temperature when flowing into the catalyst, the catalyst purification capability, the catalyst purification start temperature, and the engine Of course, it is determined in consideration of various conditions such as the type of vehicle to be mounted.

As described above, according to the present invention, it is possible to effectively reduce the amount of harmful substances contained in exhaust gas immediately after the start of engine operation when the engine is cold. Total emissions can be reduced. Therefore, by providing a vehicle equipped with an internal combustion engine equipped with the exhaust gas purifying device of the present proposal, it is possible to consider the environment and reduce the speed of global warming.

The exhaust gas purifying apparatus constructed as described above is combined with an engine and a motor, so that the motor runs at a low speed below a set speed, and the engine runs at a medium or higher speed. If it is adopted in the parallel hybrid drive system of the above, when the motor is driven and the catalyst is difficult to warm up in the city or when there is a lot of traffic, even if the driving drive by the engine is started, it will take more time than the conventional exhaust gas purification device. The temperature of the catalyst can be raised to a temperature at which the catalyst effect can be obtained by shortening, and the purifying action of the exhaust gas can be started.

Conventionally, the position of the catalyst in the exhaust system is relatively rearwardly arranged in the sporty type in order to suppress a decrease in the output of the engine. However, a decrease in the exhaust gas temperature cannot be prevented. Therefore, the exhaust manifold and the exhaust pipe have been subjected to heat retention measures such as a double exhaust manifold, but if the exhaust gas purifying apparatus of the present invention is used in combination, much of the exhaust gas discharged from the engine is reduced. In order to supply concentrated fuel to a certain part of the catalyst, if the exhaust manifold and the exhaust pipe are treated with heat insulation, such as a double structure of the exhaust manifold that has been conventionally handled, the exhaust gas that a certain part of the catalyst The heat reaches the temperature at which the catalytic effect can be obtained faster than other catalyst parts, so that the exhaust gas purifying operation can be started more quickly and more efficiently than the conventional exhaust gas purifying device, and the catalyst in the exhaust system can be efficiently removed. The degree of freedom in designing the arrangement position also increases.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view of an embodiment of the invention described in “Claim 1”, as viewed from one direction side of an exhaust gas purifying device in an exhaust system. ,
The same applies to the following drawings.

FIG. 2 is a schematic external view of an embodiment of the invention described in “Claim 1” as viewed from one direction side, in contrast to FIG.
The cover case of the automatic opening / closing device is omitted.

FIG. 3 is a schematic cross-sectional view of one embodiment of the exhaust gas purifying apparatus in an exhaust system as viewed from one direction according to another embodiment of the present invention.

FIG. 4 is a schematic cross-sectional view of the embodiment of the invention described in “Claim 1” as viewed from one direction side and FIG. 1 as viewed from the other direction side.

FIG. 5 and

FIG. 6 is a schematic external view showing an embodiment in which a communication hole and a slit are provided in the exhaust gas inflow area control valve.

FIG. 7 is a schematic external view showing an embodiment in which lip-shaped spoilers are formed on both sides in the radial direction of the exhaust gas inflow area control valve.

FIG. 8 is a schematic cross-sectional view showing an exhaust gas inflow area control valve and a position of a valve shaft of the exhaust gas inflow area control valve in another embodiment of the present invention.

FIG. 9 and

FIG. 9 is a schematic sectional view of an exhaust gas purifying apparatus in an exhaust system viewed from a certain direction side according to another embodiment of the present invention. FIG. 10 is a schematic external view of another embodiment of the present invention as viewed from one direction side of FIG. 9 as viewed from one direction side.

[Explanation of symbols]

1, 31 front exhaust pipe 2, 14, 26, 32 catalyst 3, catalyst holding part 4, 29, 33 catalyst container front chamber 5, wall surface 6, 13, 25 valve shaft 7, 15, 27, 34 exhaust gas inflow of catalyst Surfaces 8, 12, 21, 24, 35 Exhaust gas inflow area control valve 9, Catalyst part 10, Automatic opening / closing device 17A, 17B Both sides of exhaust gas inflow area control valve 18A, 18B On both sides of exhaust gas inflow area control valve Opposite side surfaces of opposed catalyst container front chamber 19A, 19B, 19C Communication hole 20 Slit 22A, 22B Lip-shaped spoiler 23A, 23B Rectifying plate 36 Projection

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[Procedure amendment]

[Submission date] January 19, 1998

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

[Fig. 1]

[Fig. 2]

[Fig. 3]

[Fig. 4]

[Fig. 5]

[Fig. 6]

[Fig. 7]

[Fig. 8]

[Fig. 9]

[Fig. 10]

Claims (2)

[Claims] An exhaust manifold or an exhaust pipe (1) at a position between an exhaust manifold or an exhaust pipe (1) connected to the exhaust manifold and a catalyst holding section (3) in which a catalyst (2) is disposed and fixed. A front end of the catalyst container (3) is connected to a front end of the catalyst holding section (3) from an outlet portion of the catalyst container. A valve shaft (6) having a rotation center set at a position on the wall surface (5) side, and the exhaust gas of the catalyst (2) while the other end is in operation of the circular arc orbit A around the valve shaft (6) as the rotation center. The exhaust gas inflow area of the exhaust gas inflow surface (7) of the catalyst (2) is controlled by fan-like movement about the valve shaft (6) as a center of rotation while maintaining an interval that does not contact the surface of the inflow surface (7). An exhaust gas inflow area control valve (8) is disposed, and the exhaust gas inflow area When the engine is cold, the control valve (8) stops at a position where the exhaust gas inflow area of the exhaust gas inflow surface (7) of the catalyst (2) is narrowed. The exhaust gas inflow area control valve (8) when the temperature is raised to a temperature at which the catalytic effect is sufficiently obtained in the catalyst portion (9) that has been intensively supplied and passed.
An exhaust gas purifying device, wherein an automatic opening / closing device (10) for gradually moving the valve shaft in a fully open direction is mounted on the valve shaft (6). (2)