JP2000337134A - Exhaust gas purification equipment for automobiles - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an exhaust emission control system for automobile capable of securely preventing the emission of a harmful component to outside and capable of being miniaturized. SOLUTION: This exhaust emission control system for automobile has an absorption catalyst module 10 arranged on the way of an exhaust pipe of an engine. The absorption catalyst module 10 is formed of a honeycomb structure 100 having an absorption part 11 at an outside part thereof and having a catalyst part 12 inside of the absorption part 11. When the absorption part 11 absorbs a harmful component included in the exhaust gas 8, the exhaust gas is flowed from the absorption part 11 to the catalyst part 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automobile exhaust gas purifying apparatus for purifying automobile exhaust gas using a catalyst section and an adsorption section.

[0002]

2. Description of the Related Art Conventionally, H contained in exhaust gas of automobiles has been known.
A catalytic device that supports a noble metal such as platinum, rhodium, palladium, etc. on a carrier such as a honeycomb structure in order to purify harmful components such as C (hydrocarbon), CO (carbon monoxide), and NOx (nitrogen oxide). Is used. However, in order for the catalytic device to purify the harmful components, the temperature of the catalytic device must reach a certain level or higher. Therefore, when the temperature of the catalyst device is low immediately after the start of the engine, the harmful components cannot be purified. In addition, immediately after the start of the engine, a large amount of HC (hereinafter referred to as cold HC) is discharged in a low temperature state, and the cold HC is released to the atmosphere without being purified.

In order to solve this problem, there has been proposed an exhaust gas purifying apparatus in which a catalyst device and an adsorbent for adsorbing cold HC are used in an exhaust system of an engine (Japanese Patent Application Laid-Open No. Hei 2 (1990) -1990).
75327). In the exhaust gas purifying apparatus, an adsorbent is provided upstream of a catalyst device in an exhaust passage so that cold HC is adsorbed to the adsorbent when the engine is cooled, and the cold HC and the engine desorbed from the adsorbent after the engine is warmed up. (Heat HC) in the heated state discharged from the tank
Is purified by a catalytic device.

However, in the above exhaust gas purifying device, the heat energy of the exhaust gas is deprived by the adsorbent when the engine is started, and the time required for the catalyst device disposed downstream to reach the activation temperature becomes longer. In addition, it is disadvantageous in terms of adsorption performance to arrange an adsorbent having better adsorption performance as the temperature is lower, upstream of the catalyst device.

[0005] From such a viewpoint, an adsorbent is disposed downstream of a catalyst device, and a simple and inexpensive structure can be used to adsorb and desorb harmful components to the adsorbent and purify the exhaust gas for an automobile. (Japanese Patent Laid-Open No. Hei 6-229)
223). In this device, the cold HC is adsorbed by the adsorbent on the downstream side during the warm-up operation, and after the engine warms up, the cold HC adsorbed to the adsorbing section is released, and the cold HC is returned to the catalyst device side. Perform purification.

[0006]

However, in the above-mentioned conventional exhaust gas purifying apparatus for automobiles, it is difficult to reduce the size because the catalyst device and the adsorbent are separately mounted.

SUMMARY OF THE INVENTION The present invention has been made in view of the conventional problems, and an object of the present invention is to provide an exhaust gas purifying apparatus for an automobile which can surely prevent the harmful components from being externally released and can be downsized.

[0008]

According to a first aspect of the present invention, there is provided an exhaust gas purifying apparatus for an automobile having an adsorption catalyst module disposed in the middle of an exhaust pipe of an engine, wherein the adsorption catalyst module is adsorbed on an outer portion. A honeycomb structure having a catalyst portion inside the adsorbing portion, wherein the adsorbing portion adsorbs harmful components in the exhaust gas.
An exhaust gas purifying apparatus for an automobile, wherein the exhaust gas is configured to flow into the catalyst section via the adsorption section.

It is most remarkable in the present invention that the adsorption catalyst module has a honeycomb structure having an adsorption portion on an outer portion and a catalyst portion inside the adsorption portion. When the adsorption is performed to adsorb the harmful component, the exhaust gas flows into the catalyst section via the adsorption section. The harmful components include, for example, hydrocarbons (HC), carbon monoxide (CO), and nitrogen oxides (NOx).

An example of the exhaust gas purifying action of the automotive exhaust gas purifying apparatus of the present invention will be described. When the catalyst unit is not in an active state, for example, immediately after the start of the engine, the adsorption unit adsorbs harmful components such as cold HC in exhaust gas. That is, at the time of the adsorption, the exhaust gas discharged from the engine is first introduced into the adsorption section, and then flows into the catalyst section (see a broken arrow in FIG. 1). As a result, even if the catalyst section is not in an active state, the harmful components are adsorbed on the adsorption section and are not released to the outside.

On the other hand, when the engine is warmed up and the catalyst section is activated, most of the exhaust gas discharged from the engine is directly introduced into the catalyst section, where heat HC and the like are exhausted. (See solid arrows in FIG. 1). At this time, a part of the exhaust gas discharged from the engine is caused to flow into the catalyst section via the adsorption section. As a result, harmful components such as cold HC that have been adsorbed in the adsorption section are released into the exhaust gas, and the harmful components are purified in the catalyst section. That is, in this state, the harmful component is not adsorbed to the adsorbing section, that is, a non-adsorbing state.

Next, the effects of the present invention will be described. The adsorption part and the catalyst part are formed of one honeycomb structure. Therefore, the size of the adsorption catalyst module can be reduced, and the size of the exhaust gas purifying apparatus for a vehicle can be reduced. Further, at the time of the adsorption, the exhaust gas is configured to flow from the adsorption section to the catalyst section. Therefore, even when the temperature of the catalyst section is low and not in an active state at the time of starting the engine or the like, the harmful components can be reliably prevented from being adsorbed in the adsorption section and released to the outside.

As described above, according to the present invention, it is possible to provide an automobile exhaust gas purifying apparatus capable of reliably preventing harmful components from being externally released and capable of being downsized.

Next, as in the second aspect of the present invention, in the adsorption catalyst module, a housing for accommodating the honeycomb structure and a flow path of exhaust gas are divided on a front end side of the honeycomb structure. A front end partition wall arranged circumferentially, and a rear end partition wall arranged around the rear end face side of the honeycomb structure for turning the exhaust gas flowing into the adsorption section back to the catalyst section; In addition, a switching means for controlling the introduction of the exhaust gas into the catalyst section may be provided in the front end partition (see FIG. 1).

Thus, at the time of adsorption, the exhaust gas can be surely introduced into the adsorption section and flowed from the adsorption section into the catalyst section. In addition, the flow path of the exhaust gas can be easily switched between the time of the adsorption and the time of the other non-adsorption.

Next, according to a third aspect of the present invention, in the adsorption catalyst module, a housing for accommodating the honeycomb structure, and a flow path of exhaust gas on a front end face side of the honeycomb structure are connected to the honeycomb structure. The front end partition wall, which is divided into the outer periphery of the body and the inside of the honeycomb structure, is arranged in a circumferential shape, and has flowed into the outer peripheral flow path between the housing and the front end partition wall on the rear end face side of the honeycomb structure. A rear end partition wall disposed circumferentially for turning the exhaust gas back to the adsorption section, and a switching means for controlling the introduction of the exhaust gas into the catalyst section is provided at the front end partition wall; (See FIG. 8).

In this case, the front end partition can be joined to the outer wall of the honeycomb structure. for that reason,
There is no need to join the end of the front end partition to the front end face of the honeycomb structure, and easy and reliable joining can be performed.

Next, according to a fourth aspect of the present invention, the adsorption catalyst module comprises a housing for accommodating the honeycomb structure, and the adsorption section and the catalyst section on a front end face side of the honeycomb structure. And a front end partition arranged so as to divide the suction portion into two parts, and a suction end portion divided by the front end partition on the rear end face side of the honeycomb structure. A back end partition wall arranged in a circumferential shape for returning the exhaust gas flowing into the first adsorption section to the other second adsorption section, and introducing the exhaust gas into the catalyst section in the front end partition wall; A switching means for controlling is provided, and an opening may be provided in a front end partition wall which divides the second adsorption part and the catalyst part on the downstream side of the switching means (FIG. 9, see FIG. 10).

In this case, since the front partition and the rear partition can have the same diameter, the number of cells of the honeycomb structure crushed by joining the front partition and the rear partition can be reduced. Therefore, a decrease in the flow path of the exhaust gas can be suppressed.

Next, as in the invention as set forth in claim 5, the switching means switches so as to introduce the exhaust gas into the adsorption section during the adsorption, and introduces the exhaust gas mainly into the catalyst section during the non-adsorption. It is preferable to have an actuator that switches in such a manner. This makes it possible to automatically switch the exhaust gas flow path.

Next, it is preferable that a heat-resistant elastic body is interposed between the front end partition and the rear end partition and the honeycomb structure. As a result, between the front end partition and the honeycomb structure,
In addition, the space between the rear end partition and the honeycomb structure can be reliably sealed. Further, a difference in thermal expansion between the honeycomb structure and the front end partition and the rear end partition can be absorbed. Therefore, harmful components can be reliably prevented from being released to the outside.

Next, as in the invention according to claim 7, it is preferable that the ends of the front end partition and the rear end partition are embedded in an embedded member embedded in the honeycomb structure. Thereby, the space between the front end partition and the honeycomb structure and the space between the rear end partition and the honeycomb structure can be more reliably sealed. In addition, since the embedded member is embedded in the honeycomb structure, there is an advantage that the bonding is hardly released. Therefore, harmful components can be more reliably prevented from being released to the outside.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment An automotive exhaust gas purifying apparatus according to an embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 2, the automotive exhaust gas purifying apparatus 1 of this embodiment is disposed in the exhaust pipe 72 of the engine 7 and has an adsorption catalyst module 10.

As shown in FIG. 1, the adsorption catalyst module 10 has a honeycomb structure 1 having an adsorption portion 11 on an outer portion and a catalyst portion 12 inside the adsorption portion 11.
It consists of 00. When the adsorbing section 11 adsorbs harmful components such as cold HC in the exhaust gas 8, the exhaust gas 8 passes through the adsorbing section 11 as shown by a dashed arrow in FIG. It is configured to flow into the catalyst unit 12.

As shown in FIG. 2, the exhaust gas purifying apparatus 1 for an automobile includes a start catalyst 14 provided in the exhaust pipe 72 downstream of the engine 7 and the adsorption catalyst module 1.
0, and the switching control device 50. The start catalyst 14 is a catalyst device that is used for purifying the exhaust gas 8 at the time of starting the engine and has a catalyst supported on a honeycomb structure. The switching control device 50 is a device that controls an actuator 53 that performs switching of the switching means 5 described below.

As shown in FIG. 1, the adsorption catalyst module 10 includes a housing 2 for accommodating the honeycomb structure 100 and a flow path for the exhaust gas 8 on the front end face 101 side of the honeycomb structure 100. And the front end partition wall 3 disposed at the front end. Further, the honeycomb structure 10
On the side of the rear end face 102, there is a rear end partition wall 4 arranged circumferentially for turning the exhaust gas 8 flowing into the adsorbing section 11 back to the catalyst section 12. The front end partition 3 is provided with a switching means 5 for controlling the introduction of the exhaust gas 8 into the catalyst section 12.

The switching means 5 switches so as to introduce the exhaust gas 8 into the adsorption section 11 during the adsorption. For example, when the temperature of the exhaust gas 8 becomes high, such as after a warm-up operation, the actuator 51 has an actuator 51 for switching the exhaust gas to introduce the exhaust gas 8 mainly to the catalyst unit 12 (FIG. 2). Further, as shown in FIG. 3, the switching means 5 includes a rotating shaft 58 rotatably attached to the front end partition 3,
An on-off valve 59 fixed to the rotating shaft 58 and having substantially the same shape as the inner peripheral shape of the front end partition 3 is provided. In FIG. 3, the on / off valve 59 shown by a solid line represents a state at the time of closing, and the on / off valve 59 shown by a two-dot chain line represents a state at the time of opening.

Further, the front end partition 3 and the rear end partition 4,
As shown in FIG. 4 (A),
As shown in (B), the heat-resistant elastic body 6 with the heat-resistant elastic body 6 interposed is circumferentially disposed around the entire end 32 of the front end partition 3 and the end 42 of the rear end partition 4. ing. The honeycomb structure 100 is in contact with the front end face 101 and the rear end face 102 of the honeycomb structure 100. The heat-resistant elastic body 6 is
It is made of an inorganic fiber material (FIG. 4A) or a heat-resistant metal gasket (FIG. 4B).

Further, in the honeycomb structure 100, since the heat-resistant elastic body 6 is joined to the front end face 101 or the rear end face 102, as shown in FIGS. A clogging portion 109 is provided. For the plugging, for example, the above honeycomb structure 1
Using a cordierite of the same material as that of 00, the honeycomb is buried in predetermined cells of the honeycomb and fired. In addition, the above-mentioned clogging can also be performed in advance at the stage of forming the honeycomb structure 100 by forming the honeycomb structure 100 into a shape (FIG. 6B) in which cells are not provided only at predetermined positions.

As shown in FIG. 1, the front end partition 3 has
An opening 31 is provided upstream of the switching means 5. A support member 21 is interposed between the outer periphery of the honeycomb structure 100 and the housing 2. And
As shown in FIG. 5, the housing 2 has a concave caulking portion 22 near the rear end face 102 of the honeycomb structure 100.
Is provided, the honeycomb structure 100 is fixed.

Next, switching of the switching means 5 by the switching control device 50 will be described with reference to FIG. First,
At step S1, the controller 5
2 (FIG. 2) is reset. Next, in step S2, the water temperature Tw of the engine 7 and the set temperature Tw ₀
Compare with If Tw> Tw ₀ , it is determined that the catalyst of the catalyst unit 12 is in the active state, and the switching unit 5 is opened to
Most of the exhaust gas 8 is introduced into the catalyst section 12 (solid arrow in FIG. 1).

On the other hand, if Tw ≦ Tw ₀ , the catalyst unit 12
The switching means 5 is closed, and the entire amount of the exhaust gas 8 is introduced into the adsorption section 11 through the opening 31. As a result, the exhaust gas 8 passes through the adsorber 1
1 and is turned back to the catalyst section 12 on the rear end face 102 side of the honeycomb structure 100. Further, the exhaust gas 8 is supplied to the inner catalyst portion 1 at the front end face 101 of the honeycomb structure 100.
2 and passes through the catalyst section 12 (dashed arrow in FIG. 1).

[0033] At this time, the timer of the controller 52 has counted the time from engine start (S1), and compares the time t with a predetermined time t ₀ (step S4). Next, when t ≧ t ₀ , it is determined that the temperature of the start catalyst 14 has risen and the catalyst has been activated, and the switching means 5 is opened (step S5). As a result, the exhaust gas 8 is directly introduced into and passed through the catalyst section 12 (solid arrow in FIG. 1). At this time, the exhaust gas 8
Is introduced into the suction section 11. Further, by operating for several seconds to several tens of seconds in this state, the catalyst unit 12 is activated.

The switching of the switching means 5 is performed as follows. That is, the actuator 53 is connected to the intake section 7 of the engine 7 through the solenoid valve 54 by the pipe 55.
1 is connected. The intake section 71 is always at a negative pressure when the engine is operating. When the solenoid valve 54 opens and closes according to a signal from the controller 52, the negative pressure acts on the actuator 53 to open and close the switching means 5.

Next, the exhaust gas purifying operation of the vehicle exhaust gas purifying apparatus 1 of this embodiment will be described. Since the start catalyst 14 is disposed immediately after the engine 7, it is activated in a relatively short time after the engine is started. However, when the temperature of the engine 7 itself is low, such as immediately after the start of the engine, the start catalyst 14 is in an inactive state.

Therefore, as described above, the water temperature of the engine 7 is checked, and if this is lower than the set value, it is determined that the start catalyst 14 is also inactive. Then, the exhaust gas 8 discharged from the engine 7 and passed through the start catalyst 14 is introduced into the adsorption section 11 and then flows into the catalyst section 12 (broken arrow in FIG. 1). Thus, even if the catalyst unit 12 and the start catalyst 14 are not in an active state, the cold HC, CO, N
Harmful components such as Ox are adsorbed and not released to the outside.

On the other hand, the engine 7 is warmed up,
When the start catalyst 14 is activated, most of the exhaust gas 8 discharged from the engine 7 and passing through the start catalyst 14 is directly introduced into the catalyst section 12. If the operation is performed for several seconds to several tens of seconds in this state, the catalyst unit 12 is activated, and the harmful components such as heat HC are purified in the catalyst unit 12 (solid arrows in FIG. 1).

At this time, a part of the exhaust gas 8 discharged from the engine 7 flows into the catalyst section 12 through the adsorption section 11. As a result, harmful components such as cold HC that have been adsorbed by the adsorption unit 11 are released into the exhaust gas 8, and the harmful components are purified by the catalyst unit 12. That is, in this state, the harmful component is not adsorbed to the adsorbing section 11 and is not adsorbed.

Next, the effect of this embodiment will be described. The adsorbing section 11 and the catalyst section 12 are connected to one honeycomb structure 1.
It consists of 00. Therefore, the adsorption catalyst module 10
Is reduced, and the exhaust gas purifying apparatus 1 for a vehicle can be reduced in size.

Further, at the time of the adsorption, the exhaust gas 8 is configured to flow from the adsorption section 11 into the catalyst section 12 (broken arrow in FIG. 1). Therefore, even when the temperature of the catalyst unit 12 is low and not in an active state, such as when the engine is started, the harmful components can be reliably prevented from being adsorbed in the adsorption unit 11 and released to the outside.

The switching means 5 switches the exhaust gas 8 into the adsorption section 11 during the adsorption.
An actuator 53 is provided to switch the exhaust gas mainly to the catalyst section 12 during non-adsorption. Thereby, the switching of the flow path of the exhaust gas 8 can be automatically performed by the signal of the controller 52. Therefore, it is possible to easily and appropriately switch the flow path of the exhaust gas 8.

Further, the front end partition wall 3 and the rear end partition wall 4,
A heat-resistant elastic body 6 is interposed between the honeycomb structure 100 and the honeycomb structure 100. Therefore, it is possible to reliably seal between the front end partition 3 and the honeycomb structure 100 and between the rear end partition 4 and the honeycomb structure 100. Further, a difference in thermal expansion between the honeycomb structure 100 and the front end partition 3 and the rear end partition 4 can be absorbed. Therefore, harmful components can be reliably prevented from being released to the outside.

As described above, according to the present embodiment, it is possible to provide an exhaust gas purifying apparatus for an automobile which can surely prevent harmful components from being externally released and can be downsized.

Embodiment 2 In this embodiment, as shown in FIG. 8, the front end partition wall 3 is divided into a flow path of the exhaust gas 8 on the front end face 101 side of the honeycomb structure 100 into an outer periphery and an inside of the honeycomb structure 100. This is an example in which they are arranged circumferentially. The adsorption catalyst module 10 of the present embodiment is for turning the exhaust gas 8 flowing into the outer peripheral flow path 23 between the housing 2 and the front end partition 3 on the rear end face 102 side of the honeycomb structure 100 to the adsorption section 11. , And a rear end partition wall 4 arranged in a circumferential shape. Other configurations are the same as those of the first embodiment.

The flow of the exhaust gas 8 in the adsorption catalyst module 10 of the automotive exhaust gas purifying apparatus 1 of this embodiment is as follows. That is, at the time of adsorption, the exhaust gas 8 passes through the opening 31 and passes through the outer peripheral flow path 23, and is returned to the adsorption section 11 at the rear end face 102 of the honeycomb structure 100. The exhaust gas 8 that has passed through the adsorption unit 11
Is further folded on the front end face 101 side of the honeycomb structure 100 and passes through the catalyst section 12 (broken arrow in FIG. 8). On the other hand, at the time of non-adsorption, it is the same as in the first embodiment (solid arrow in FIG. 8).

In this case, the front end partition 3 can be joined to the outer wall 105 of the honeycomb structure 100 via the support member 21. Therefore, unlike the first embodiment, it is not necessary to join the end of the front end partition 3 to the front end face 101 of the honeycomb structure 100, and easy and reliable joining can be performed. In addition, the third embodiment has the same functions and effects as the first embodiment.

Embodiment 3 In this embodiment, as shown in FIG. 9 to FIG. 11, the flow of exhaust gas 8 is
This is an example of the automotive exhaust gas purifying apparatus 1 having the adsorption catalyst module 10 arranged so as to divide the adsorber 11 into two parts.

That is, as shown in FIGS. 9 and 10, the adsorption catalyst module 10 includes the housing 2 for housing the honeycomb structure 100 and the adsorbing portion 11 on the front end face 101 side of the honeycomb structure 100. It has a front end partition wall 3 arranged circumferentially between the catalyst section 12 and the adsorbing section 11 arranged so as to be divided into two. That is, as shown in FIG. 10, the front end partition 3 includes a cylindrical partition 30 and two plate-shaped partitions 38 and 39 arranged at right angles to the outer side surface of the cylindrical partition 30. The cylindrical partition wall 30 is connected to the front end face 101 of the honeycomb structure 100.
On the side, the flow of the exhaust gas 8 is divided into the adsorption section 11 and the catalyst section 12. In addition, the above-mentioned plate-like partition walls 38, 39
Exhaust gas 8 flowing into the adsorption section 11 and the adsorption section 1
Exhaust gas 8 passing through 1 is isolated.

The adsorbing catalyst module 10 has one of the first adsorbing portions 11 divided by the front end partition 3 on the rear end face 102 side of the honeycomb structure 100.
A rear end partition wall arranged around the circumference to turn the exhaust gas 8 flowing into the adsorption section 111 (the lower side in FIGS. 9 and 10) to the other second adsorption section 112 (the upper side in FIGS. 9 and 10). And 4.

The front end partition 3 is provided with switching means 5 for controlling the introduction of the exhaust gas 8 into the catalyst section 12. Further, an opening 312 is provided in the front end partition 3 that divides the second adsorbing section 112 and the catalyst section 12 on the downstream side of the switching means 5. Further, the first adsorbing section 111 and the catalyst section 12 on the upstream side of the switching means 5 are provided.
An opening 311 is provided in the front end partition wall 3 which divides the partition wall.

In the honeycomb structure 100, the portion where the front end partition wall 3 is in contact is shown in FIG.
As shown in (A) and (B), the clogging portions 109, 381, and 391 are provided as in the first embodiment. That is, the honeycomb structure 100 is cylindrically divided into the adsorption unit 11 and the catalyst unit 12 by the annular plugging unit 109. Further, the annular suction portion 11 on the outer periphery is divided into a first suction portion 111 at a lower portion and a second suction portion 112 at an upper portion by plate-shaped plugging portions 381 and 391. The plugging portions 109, 381, and 391 are formed by plugging the honeycomb passage. Also, the honeycomb front end face 1
01, the clogging portion 109 includes the front end partition 3
Cylindrical partition wall 30 is in contact with the clogging portion 381,
The plate-shaped partitions 38 and 39 are in contact with 391, respectively. Other configurations are the same as those of the first embodiment.

The flow of the exhaust gas 8 in the adsorption catalyst module 10 of the automotive exhaust gas purifying apparatus 1 of this embodiment is as follows. That is, at the time of adsorption, the exhaust gas 8 passes through the opening 311 and passes through the lower first adsorbing section 111. Next, the rear end face 102 of the honeycomb structure 100
On the side, it is folded back to the second suction section 112 on the upper side. Next, the exhaust gas 8 that has passed through the second adsorption section 112 is further folded back on the front end face 101 side of the honeycomb structure 100 and passes through the catalyst section 12 (dashed arrows in FIGS. 9 and 10). On the other hand, at the time of non-adsorption, it is the same as in the first embodiment (solid arrow in FIG. 9).

In the case of this example, as shown in FIGS. 9 and 10, the front end partition 3 and the rear end partition 4 can have the same diameter, so that the front end partition 3 and the rear end partition 4 are joined together. The number of cells of the honeycomb structure 100 to be crushed can be reduced. Therefore, a decrease in the flow path of the exhaust gas 8 can be suppressed. In addition, the third embodiment has the same functions and effects as the first embodiment.

Fourth Embodiment As shown in FIG. 12, this embodiment is an example in which the outer periphery of the rear end face 102 of the honeycomb structure 100 is cut out, and the rear end partition 4 is joined from the outer periphery in the notch 103. That is, the outer periphery of the rear end face 102 of the cylindrical honeycomb structure 100 is notched to a predetermined width and a predetermined depth to provide the notch 103. And it is joined to the outer periphery of the notch 103 via the support member 21. Others are the same as the second embodiment.

In the adsorption catalyst module 10 of the automotive exhaust gas purifying apparatus 1 of this embodiment, the flow of the exhaust gas 8 is as follows. That is, at the time of adsorption, the exhaust gas 8 passes through the opening 31, passes through the outer peripheral flow path 23, and is returned to the adsorption section 11 at the notch 103. The exhaust gas 8 that has passed through the adsorption section 11 is further folded back on the front end face 101 side of the honeycomb structure 100 and passes through the catalyst section 12 (dashed arrow in FIG. 12). on the other hand,
At the time of non-suction, it is the same as in the second embodiment (solid arrow in FIG. 12).

In this case, the front end partition 3 can be joined to the outer wall 105 of the honeycomb structure 100 via the support member 21, and the rear end partition 4 can also be connected to the outer periphery of the notch 103. Can be joined via the support member 21. Therefore, there is no need to join the end 32 of the front end partition 3 or the end 42 of the rear end partition 4 to either the front end face 101 or the rear end face 102 of the honeycomb structure 100. Therefore, the front end partition 3 and the rear end partition 4
Can be easily and reliably joined to the honeycomb structure 100. In addition, the third embodiment has the same functions and effects as those of the second embodiment.

Embodiment 5 In this embodiment, as shown in FIG. 13, a honeycomb body 106 having a diameter smaller than that of the honeycomb structure 100 is connected in series to the rear end face 102 of the honeycomb structure 100. The honeycomb body 106 constitutes a part behind the catalyst unit 12. Others are the same as the fourth embodiment.

In the case of this embodiment, the step portion 104 having the same function as the notch portion can be formed without performing the notch processing as in the fourth embodiment. Therefore, the adsorption catalyst module 10 can be manufactured more easily. In addition, the fourth embodiment has the same functions and effects as the fourth embodiment.

Embodiment 6 In this embodiment, as shown in FIG. 14, a groove 107 is provided circumferentially on the outer wall 105 of the honeycomb structure 100 near the rear end face 102. In the adsorption catalyst module 10 in the automotive exhaust gas purifying apparatus 1 of this embodiment, the front end partition wall 3 extends to near the rear end face 102 of the honeycomb structure 100 and is joined to the outer wall 105 via the support member 21. A vent 32 is provided in the front end partition 3 at the position of the groove 107. Further, a clogging portion 109 is formed on the rear end face 102 with a width equal to the depth of the groove 107 from the outer wall 105. In addition,
The depth of the groove 107 is also the width of the suction section 11.

The flow of the exhaust gas 8 in the adsorption catalyst module 10 of the automotive exhaust gas purifying apparatus 1 of this embodiment is as follows. That is, at the time of adsorption, the exhaust gas 8 passes through the opening 31 and the outer peripheral flow path 23 and passes through the groove 107.
Is folded back to the suction section 11 at. Absorption unit 1
The exhaust gas 8 having passed through the honeycomb structure 10
On the side of the front end face 101 of the zero, the wire is further folded and passes through the catalyst part 12 (broken arrow in FIG. 14). On the other hand, at the time of non-adsorption, it is the same as in the fourth embodiment (solid arrow in FIG. 14). Others are the same as the fourth embodiment.

In this embodiment, the flow path of the exhaust gas 8 is divided only by the front end partition 3 without providing the rear end partition. Therefore, the structure of the adsorption catalyst module 10 can be simplified. In addition, the honeycomb structure 100
Is held by the integrated front end partition 3, so that the adsorption catalyst module 10 with high strength can be obtained. In addition, the fourth embodiment has the same functions and effects as the fourth embodiment.

Embodiment 7 In this embodiment, as shown in FIG. 15, there are shown various examples of a joining method between the front end partition or the rear end partition and the honeycomb structure. In the following, a description will be given by taking as an example the joining between the front end face 101 of the honeycomb structure 100 and the front end partition 3.

FIG. 15A shows a recess 16 provided in the front end face 101 and a heat-resistant elastic member 6 embedded in the recess 16 together with the end 32 of the front end partition 3. Examples of the heat-resistant elastic member 6 include cordierite and inorganic fiber materials. In this case, the bonding between the front end partition 3 and the honeycomb structure 100 is further strengthened.

FIG. 15B shows a state in which a reinforcing material 17 is attached to a portion of the front end face 101 where the front end partition 3 is joined. In this case, the honeycomb structure 100
Of the honeycomb structure 100 can be prevented, and problems such as chipping of the honeycomb structure 100 can be prevented.

FIG. 15C shows an example in which a clearance C is provided between the end 32 of the front end partition 3 and the front end face 101 of the honeycomb structure 100. The clearance C is such that the amount of the exhaust gas 8 leaked can be sufficiently suppressed even when the housing 2 thermally expands. In this case, since it is not necessary to use a heat-resistant elastic body, the cost can be reduced.

FIG. 15 (D) shows that a recess 16 is provided in the front end face 101 and the heat-resistant elastic member 6 is embedded in the recess 16.
From above, the front end partition 3 is connected via a wire mesh 108.
This is an example in which the end portions 32 are joined. In this case, the heat-resistant elastic body 6 can be prevented from scattering.

[Brief description of the drawings]

FIG. 1 is an explanatory cross-sectional view of an adsorption catalyst module of an automobile exhaust gas purification device according to a first embodiment.

FIG. 2 is an explanatory diagram of an exhaust gas purifying apparatus for a vehicle according to the first embodiment.

FIG. 3 is an explanatory diagram of a switching unit according to the first embodiment.

FIG. 4 is an enlarged cross-sectional view of a joint portion between a front end partition and a honeycomb structure according to the first embodiment.

FIG. 5 is an enlarged cross-sectional view of the vicinity of a caulked portion of a housing in the first embodiment.

FIG. 6A is a cross-sectional explanatory view taken along line AA of FIG. 1, FIG.
FIG. 2A is a partially enlarged view of a clogging portion.

FIG. 7 is a flowchart illustrating a control method of a switching unit by the switching control device according to the first embodiment.

FIG. 8 is an explanatory cross-sectional view of an adsorption catalyst module of an automotive exhaust gas purification device according to a second embodiment.

FIG. 9 is an explanatory sectional view of an adsorption catalyst module of an automotive exhaust gas purifying apparatus according to a third embodiment.

FIG. 10 is a perspective view of an adsorption catalyst module of an automobile exhaust gas purifying apparatus according to a third embodiment.

11A is a cross-sectional explanatory view taken along line BB of FIG.
(B) The elements on larger scale of the clogging part of (A).

FIG. 12 is an explanatory sectional view of an adsorption catalyst module of an exhaust gas purifying apparatus for a vehicle according to a fourth embodiment.

FIG. 13 is an explanatory cross-sectional view of an adsorption catalyst module of an automotive exhaust gas purification device according to a fifth embodiment.

FIG. 14 is a sectional explanatory view of an adsorption catalyst module of an exhaust gas purifying apparatus for a vehicle according to a sixth embodiment.

FIG. 15 is a cross-sectional explanatory view showing various joining methods between the front end partition and the honeycomb structure in the seventh embodiment.

[Explanation of symbols]

 1. . . 9. Exhaust gas purification equipment for automobiles, . . 10. adsorption catalyst module, . . Adsorption section, 12. . . Catalyst part, 100. . . 101. honeycomb structure; . . Front end face, 102. . . 1. rear end face, . . Housing, 21. . . 2. support member; . . 31. front end bulkhead; . . Opening, 4. . . 4. rear end partition, . . Switching means, 6. . . 6. heat-resistant elastic body, . . Engine, 8. . . Exhaust gas,

Continuing from the front page (72) Inventor Makoto Saito 1-1-1, Showa-cho, Kariya-shi, Aichi Prefecture Inside Denso Corporation (72) Inventor Shigeto Yabata 1-1-1, Showa-cho, Kariya City, Aichi Prefecture Inside Denso Corporation ( 72) Inventor Kanehito Nakamura 1-1-1, Showa-cho, Kariya-shi, Aichi Prefecture Inside Denso Co., Ltd. (72) Inventor Sakurai No. 1 Toyota-cho, Toyota-shi, Aichi Prefecture Toyota Motor Corporation (72) Inventor Ito Takasune 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Corporation F-term (reference) 3G091 AA02 AB00 AB08 AB09 AB10 BA03 BA14 BA15 BA19 BA32 BA39 CA12 CA13 DA03 DB10 EA16 EA17 EA30 FA02 FA04 FA12 FA13 FB02 FC04 FC07 GA06 GA16 GA17 GA18 GA24 GB01X GB01Z GB10X GB16Z GB17X HA08 HA18 HA19 HA20 HA27 HA28 HA29 HA31 HA46 HA47 HB02 HB03

Claims (7)

[Claims] 1. An exhaust gas purifying apparatus for an automobile having an adsorption catalyst module disposed in the middle of an exhaust pipe of an engine, wherein the adsorption catalyst module has an adsorption portion on an outer portion and is located inside the adsorption portion. A honeycomb structure having a catalyst portion, wherein the exhaust gas flows into the catalyst portion through the adsorption portion when the adsorption portion adsorbs harmful components in the exhaust gas. Exhaust gas purification device. 2. The adsorption catalyst module according to claim 1, wherein the adsorption catalyst module includes a housing for housing the honeycomb structure,
At the front end face of the honeycomb structure, the exhaust gas flow path is divided, and the front end partition walls are arranged circumferentially. At the rear end face of the honeycomb structure, the exhaust gas flowing into the adsorption section is turned back to the catalyst section. And a switching means for controlling the introduction of the exhaust gas into the catalyst section is provided on the front partition wall. Exhaust gas purification equipment for automobiles. 3. The adsorption catalyst module according to claim 1, wherein the adsorption catalyst module includes a housing for housing the honeycomb structure,
A front end partition wall arranged circumferentially, which divides a flow path of exhaust gas on the front end face side of the honeycomb structure into an outer periphery of the honeycomb structure and an inside of the honeycomb structure, and a rear end face side of the honeycomb structure. And a rear end partition wall disposed circumferentially for turning exhaust gas flowing into an outer peripheral flow path between the housing and the front end partition wall to the adsorbing portion.
And a switching means for controlling the introduction of the exhaust gas into the catalyst section at the front end partition. 4. The adsorption catalyst module according to claim 1, wherein the adsorption catalyst module comprises a housing for housing the honeycomb structure.
On the front end face side of the honeycomb structure, a front end partition wall is arranged circumferentially between the adsorbing portion and the catalyst portion, and the adsorbing portion is arranged so as to be divided into two portions. On the end face side, the exhaust gas flowing into one of the first adsorption sections of the adsorption section divided by the front end partition is
A rear end partition wall which is arranged in a circumferential shape so as to be folded back to the other second adsorption section, and a switching means for controlling introduction of the exhaust gas into the catalyst section is provided in the front end partition wall. An exhaust gas purifying apparatus for an automobile, wherein an opening is provided in a front end partition wall that divides the second adsorbing section and the catalyst section downstream of the switching means. 5. The method according to claim 1, wherein:
The above-mentioned switching means has an actuator which switches so that the exhaust gas is introduced into the adsorbing section at the time of the adsorption, and which switches so that the exhaust gas is mainly introduced into the catalyst section at the time of non-adsorption. apparatus. 6. The method according to claim 1, wherein:
An exhaust gas purifying apparatus for automobiles, wherein a heat-resistant elastic body is interposed between the front end partition and the rear end partition and the honeycomb structure. 7. The method according to claim 1, wherein:
An exhaust gas purifying apparatus for an automobile, wherein the ends of the front end partition and the rear end partition are embedded in an embedded member embedded in the honeycomb structure.