Exhaust purifier
The exhaust gas purification device addresses catalyst degradation by rotating the catalyst based on reaction state detection, ensuring even exhaust gas distribution and maintaining purification performance through controlled catalyst rotation.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- AISAN IND CO LTD
- Filing Date
- 2024-12-19
- Publication Date
- 2026-07-01
AI Technical Summary
Existing exhaust gas purification devices face challenges in maintaining effective exhaust gas purification performance due to catalyst degradation in areas where exhaust gas hits strongly, caused by the shape of the vehicle's S/C and exhaust passage layout, leading to uneven catalyst wear and reduced efficiency.
An exhaust gas purification device with a catalyst rotation mechanism controlled by a rotation control unit, utilizing a catalyst reaction state detection unit to adjust the catalyst's rotation based on detected reaction states, such as oxygen storage amount, to evenly distribute exhaust gas flow across the catalyst's surface, reducing degradation and maintaining performance.
The device effectively utilizes the entire catalyst area without bias, reducing degradation and maintaining exhaust gas purification performance by adjusting catalyst rotation according to detected reaction states, such as oxygen storage capacity, thereby enhancing catalyst longevity and purification efficiency.
Smart Images
Figure 2026109128000001_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to an exhaust gas purification device that purifies exhaust gas flowing through an exhaust passage.
Background Art
[0002] Patent Document 1 discloses an exhaust gas purification device that rotates a catalyst provided in a catalyst unit connected to an exhaust pipe around its axis.
Prior Art Documents
Patent Documents
[0003]
Patent Document 1
Summary of the Invention
Problems to be Solved by the Invention
[0004] With the strengthening of exhaust regulations, it is necessary to satisfy exhaust gas regulations with a catalyst having a small amount of precious metal. Here, depending on the shape of the vehicle's S / C (start converter) and the layout of the exhaust passage, the catalyst may not be used effectively. Currently, the amount of precious metal is increased to cope with this, but there is a concern about a decrease in the exhaust gas purification performance due to the progress of deterioration only in a part of the catalyst. That is, if the area where the exhaust gas hits the catalyst is limited due to the S / C shape or the layout of the exhaust passage, deterioration will progress in the area where the exhaust gas hits the catalyst strongly. And when the deterioration of the catalyst progresses, the exhaust gas purification performance cannot be maintained.
[0005] Here, the exhaust gas purification device disclosed in Patent Document 1 rotates the catalyst around its axis in order to perform NOx emission and reduction with a simple configuration, and does not rotate the catalyst in order to reduce the deterioration of the catalyst.
[0006] Therefore, this disclosure has been made to solve the above-mentioned problems, and aims to provide an exhaust gas purification device that can reduce catalyst degradation and maintain exhaust gas purification performance. [Means for solving the problem]
[0007] One embodiment of the present disclosure made to solve the above problems is an exhaust gas purification device having a catalyst for purifying exhaust gas, a rotation mechanism for rotating the catalyst with the flow direction of the exhaust gas as its axis, and a rotation control unit for controlling the rotation mechanism, wherein the device has a catalyst reaction state detection unit for detecting the reaction state of the catalyst, and the rotation control unit controls the rotation of the catalyst by the rotation mechanism based on the value detected by the catalyst reaction state detection unit.
[0008] According to this embodiment, the rotation of the catalyst can be controlled according to the reaction state of the catalyst. Therefore, the area to which the exhaust gas strikes the catalyst can be adjusted according to the reaction state of the catalyst, so that the entire area of the catalyst can be utilized without bias to purify the exhaust gas. Consequently, deterioration of the catalyst in areas where the exhaust gas strikes is strong can be suppressed. Thus, catalyst deterioration can be reduced and the exhaust gas purification performance can be maintained.
[0009] In the above embodiment, it is preferable that the catalyst is located within the start converter.
[0010] According to this embodiment, the region in the catalyst that is hit by exhaust gas can be improved depending on the shape of the start converter and the layout of the exhaust passage.
[0011] In the above embodiment, it is preferable that the detected value of the catalyst reaction state detection unit is the detected value of the oxygen storage amount of the catalyst.
[0012] According to this embodiment, the reaction state of the catalyst can be accurately detected by detecting the amount of oxygen absorbed by the catalyst. Therefore, the catalyst can be rotated according to the accurately detected reaction state of the catalyst. Consequently, exhaust gas can be purified more effectively by utilizing the entire area of the catalyst without bias. Thus, the deterioration of the catalyst can be reduced more effectively, and the exhaust gas purification performance can be maintained.
[0013] In the above embodiment, it is preferable that the rotation control unit rotates the catalyst using the rotation mechanism when the detected value of the oxygen storage amount of the catalyst decreases by a predetermined value or more compared to the value detected between the time the previous start switch in the vehicle on which the exhaust purification device is installed was turned on and turned off.
[0014] According to this embodiment, if the oxygen storage capacity of the catalyst decreases significantly, it is determined that the reaction state of the catalyst has deteriorated, and the catalyst is rotated. This allows for more effective and even utilization of the entire area of the catalyst to purify the exhaust gas. Therefore, catalyst degradation can be reduced more effectively, and the exhaust gas purification performance can be maintained.
[0015] Another embodiment of the present disclosure made to solve the above problems is an exhaust gas purification device having a catalyst for purifying exhaust gas, a rotation mechanism for rotating the catalyst with respect to the flow direction of the exhaust gas as its axis, and a rotation control unit for controlling the rotation mechanism, wherein the rotation control unit rotates the catalyst by the rotation mechanism when the start switch of the vehicle on which the exhaust gas purification device is installed is turned off.
[0016] According to this embodiment, the catalyst can be rotated appropriately each time the vehicle's start switch is turned off. Furthermore, since the vehicle's start switch is off and no exhaust gas is flowing when the catalyst is rotating, the influence of the exhaust gas flow on the catalyst's rotation can be suppressed, allowing the catalyst to rotate stably. As a result, the entire area of the catalyst can be utilized without bias to purify the exhaust gas. Consequently, deterioration in areas of the catalyst that are strongly hit by exhaust gas can be suppressed. Therefore, catalyst deterioration can be reduced, and the exhaust gas purification performance can be maintained.
[0017] Another embodiment of the present disclosure made to solve the above problems is an exhaust gas purification device having a catalyst for purifying exhaust gas, a rotation mechanism for rotating the catalyst with respect to the flow direction of the exhaust gas as its axis, and a rotation control unit for controlling the rotation mechanism, wherein the rotation control unit rotates the catalyst by the rotation mechanism when the vehicle on which the exhaust gas purification device is mounted remains stationary for a predetermined period of time.
[0018] According to this embodiment, the catalyst can be rotated at the timing when the vehicle remains stationary for a certain period of time, which would normally accelerate catalyst degradation. Furthermore, since the catalyst is rotated while the vehicle is stationary, the influence of vehicle vibrations on the catalyst's rotation can be suppressed, allowing for stable catalyst rotation. As a result, the entire surface area of the catalyst can be utilized without bias to purify the exhaust gas. Consequently, degradation in areas of the catalyst that are strongly hit by exhaust gas can be suppressed. Therefore, catalyst degradation can be reduced, and the exhaust gas purification performance can be maintained.
[0019] Another embodiment of the present disclosure made to solve the above problems is an exhaust gas purification device having a catalyst for purifying exhaust gas, a rotation mechanism for rotating the catalyst with respect to the flow direction of the exhaust gas as its axis, and a rotation control unit for controlling the rotation mechanism, wherein the rotation control unit rotates the catalyst by the rotation mechanism when the increase in the accelerator opening per unit time in a vehicle on which the exhaust gas purification device is installed is equal to or greater than a predetermined opening amount.
[0020] According to this aspect, when the accelerator pedal of the vehicle is deeply depressed and the exhaust volume of the vehicle enters a transient state, making it easier for the catalyst to deteriorate, the catalyst can be rotated. Therefore, the exhaust gas can be purified by evenly utilizing the entire area of the catalyst. Thus, it is possible to suppress the progress of deterioration in the area of the catalyst where the exhaust gas hits strongly. Therefore, the deterioration of the catalyst can be reduced and the purification performance of the exhaust gas can be maintained.
[0021] In another aspect of the present disclosure made to solve the above problems, in an exhaust gas purification device having a catalyst for purifying exhaust gas, a rotation mechanism for rotating the catalyst about an axis in the flow direction of the exhaust gas, and a rotation control unit for controlling the rotation mechanism, the rotation control unit rotates the catalyst by the rotation mechanism when the vehicle on which the exhaust gas purification device is mounted travels continuously at a predetermined speed for a predetermined travel time.
[0022] According to this aspect, the catalyst can be rotated at a timing when the running state of the vehicle at a constant speed continues for a certain period of time and it becomes easier for the catalyst to deteriorate. Therefore, the exhaust gas can be purified by evenly utilizing the entire area of the catalyst. Thus, it is possible to suppress the progress of deterioration in the area of the catalyst where the exhaust gas hits strongly. Therefore, the deterioration of the catalyst can be reduced and the purification performance of the exhaust gas can be maintained.
[0023] In the above aspect, it is preferable to have a solar cell that generates electric power for rotating the catalyst and supplies the electric power to the rotation mechanism.
[0024] According to this aspect, the catalyst can be rotated using the electric power generated by the solar cell, which is renewable energy. Therefore, even in a situation where there is no power source, the electric power for rotating the catalyst can be secured.
Advantages of the Invention
[0025] According to the exhaust gas purification device of the present disclosure, the deterioration of the catalyst can be reduced and the purification performance of the exhaust gas can be maintained.
Brief Description of the Drawings
[0026] [Figure 1] FIG. 1 is a diagram showing a schematic configuration of a part of an exhaust gas purification device according to this embodiment and a vehicle on which this exhaust gas purification device is mounted. [Figure 2] FIG. 2 is a cross-sectional view of the exhaust gas purification device according to this embodiment taken in a direction perpendicular to the central axis of the catalyst. [Figure 3] FIG. 3 is a flowchart showing the content of control performed by the rotation control unit. [Figure 4] FIG. 4 is a diagram showing the rotation of the catalyst by a predetermined angle. [Figure 5] FIG. 5 is a diagram showing that the area where the exhaust gas hits the catalyst is limited.
Embodiments for Carrying Out the Invention
[0027] Embodiments of the exhaust gas purification device of the present disclosure will be described.
[0028] (Overview of the Exhaust Gas Purification Device) As shown in FIG. 1, the exhaust gas purification device 1 according to this embodiment is provided as a part of the exhaust passage 102 of the engine 101 mounted on the vehicle 201. As shown in FIGS. 1 and 2, the exhaust gas purification device 1 has a case 11, a mat material 12, and a catalyst 13.
[0029] The case 11 is made of metal and is formed in a cylindrical shape.
[0030] The mat material 12 is disposed inside the inner peripheral surface of the case 11. This mat material 12 is formed of, for example, glass wool and has a heat insulating function and a sound absorbing function.
[0031] The catalyst 13 purifies the exhaust gas and is positioned inside the inner circumferential surface of the case 11. It is composed of a three-way catalyst made of precious metal and is formed in a cylindrical shape with a honeycomb structure. In this embodiment, the exhaust gas purification device 1 corresponds to a start converter, and the catalyst 13 is located inside this start converter.
[0032] In the exhaust gas purification device 1 configured as described above, the exhaust gas flowing through the exhaust passage 102 is purified by passing through the catalyst 13.
[0033] (Regarding catalyst rotation) Depending on the S / C (start converter) shape and the layout of the exhaust passage 102 of the vehicle 201, the catalyst 13 may not be used effectively, raising concerns about a decrease in exhaust gas purification performance due to the deterioration of only a portion of the catalyst 13. In other words, depending on the S / C shape and the layout of the exhaust passage 102, if the area of the catalyst 13 that is hit by exhaust gas is limited to, for example, region RE0 as shown in Figure 5, the catalyst 13 will deteriorate in region RE0 where the exhaust gas hits. And if the catalyst 13 deteriorates, it will become impossible to maintain exhaust gas purification performance.
[0034] Therefore, in order to improve this, in this embodiment, the catalyst 13 is rotated so that exhaust gas is directed onto the entire area of the catalyst 13, thereby effectively utilizing the catalyst 13 and reducing its deterioration.
[0035] Specifically, as shown in Figure 1, the exhaust gas purification device 1 of this embodiment includes, in addition to the catalyst 13, a ball bearing 14, a rotating mechanism 15, and a rotating control unit 16.
[0036] The ball bearing 14 includes an upstream ball bearing 14A positioned at the upstream end of the catalyst 13 (i.e., the upstream end in the exhaust gas flow direction FD) and a downstream ball bearing 14B positioned at the downstream end of the catalyst 13 (i.e., the downstream end in the exhaust gas flow direction FD). The upstream ball bearing 14A and the downstream ball bearing 14B are provided between the case 11 and the catalyst 13, and together with the catalyst 13 they support the catalyst 13 in a manner that allows it to rotate around the center line CL of the catalyst 13.
[0037] The rotating mechanism 15 is a mechanism that rotates the catalyst 13 with the exhaust gas flow direction FD as its axis, that is, around a center line CL parallel to the exhaust gas flow direction. The rotating mechanism 15 includes a gear section 21 and a motor 22.
[0038] The gear section 21 includes a gear (not shown) that meshes with a gear (not shown) formed on the upper surface 14Ba of the downstream ball bearing 14B (i.e., the upstream surface in the exhaust gas flow direction FD). By rotating the gear section 21, the downstream ball bearing 14B is rotated, thereby allowing the catalyst 13, which is integrated with the downstream ball bearing 14B, to rotate around its center line CL.
[0039] The rotation control unit 16 is a device that includes, for example, an arithmetic processing unit such as a CPU, a storage unit such as a ROM that stores control programs and control data processed by the CPU, and a RAM used as various work areas for control processing, and an input / output interface unit, and controls the rotational movement of the catalyst 13 by the rotation mechanism 15.
[0040] The rotation control unit 16 receives information on the detected values of the oxygen sensor 17, accelerator pedal position sensor 111, and vehicle speed sensor 112, which will be described later, as well as information on whether the ignition switch IG of the vehicle 201 is on or off. The ignition switch IG is an example of the "start switch" in this disclosure.
[0041] Furthermore, the exhaust gas purification device 1 has an oxygen sensor 17 provided downstream of the catalyst 13 in the exhaust passage 102. This oxygen sensor 17 is a sensor for detecting the amount of oxygen absorbed by the catalyst 13. That is, based on the oxygen concentration in the exhaust gas that has passed through the catalyst 13 detected by the oxygen sensor 17, the rotation control unit 16 calculates and detects the amount of oxygen absorbed by the catalyst 13, which indicates the reaction state of the catalyst 13. Note that the oxygen sensor 17 is an example of the "catalyst reaction state detection unit" in this disclosure.
[0042] In this embodiment, the rotation control unit 16 controls the rotation of the catalyst 13 by the rotation mechanism 15 based on the value detected by the oxygen sensor 17.
[0043] In this embodiment, the rotation of the catalyst 13 can be controlled according to the amount of oxygen stored in the catalyst 13 detected from the oxygen sensor 17. Therefore, the area of the catalyst 13 that is hit by exhaust gas can be adjusted according to the amount of oxygen stored in the catalyst 13, so that the entire area of the catalyst 13 can be utilized without bias to purify the exhaust gas. Consequently, deterioration of the catalyst 13 in areas where it is hit by exhaust gas strongly can be suppressed. Thus, the deterioration of the catalyst 13 can be reduced and the exhaust gas purification performance can be maintained.
[0044] Furthermore, by detecting the oxygen storage capacity of catalyst 13, the reaction state (i.e., degradation state) of catalyst 13 can be detected with high accuracy. Therefore, catalyst 13 can be rotated according to the accurately detected reaction state of catalyst 13. Consequently, exhaust gas can be purified more effectively by utilizing the entire range of catalyst 13 without bias. Thus, the degradation of catalyst 13 can be reduced more effectively, and the exhaust gas purification performance can be maintained.
[0045] In this embodiment, more specifically, the rotation control unit 16 performs control as shown in Figure 3. As shown in Figure 3, the rotation control unit 16 observes the amount of oxygen stored in the catalyst 13, which is detected based on the detected value of the oxygen sensor 17, when performing a deterioration diagnosis of the catalyst 13 (and / or a responsiveness diagnosis of the oxygen sensor 17) while the vehicle 201 is running, as a timing for changing the target A / F of the vehicle 201 (step S1).
[0046] Then, when the detected oxygen storage amount of the catalyst 13 decreases by a predetermined value X (for example, 0.05 g) or more compared to the value detected in the previous trip (Step S2: YES), the rotation control unit 16 applies power to the motor 22 at the timing when the ignition switch IG of the vehicle 201 is turned off, to rotate the gear unit 21 and rotate the catalyst 13 by a predetermined angle θ as shown in Figure 4 (Step S3).
[0047] The "value detected during the previous trip" refers to the value detected during one trip in vehicle 201, from when the ignition switch IG was turned on until it was turned off. For example, it is the average value of the oxygen storage capacity of catalyst 13 detected multiple times during the previous trip.
[0048] Furthermore, the predetermined angle θ is less than 360°, for example, between 90° and 120°. Note that the predetermined angle θ may be changed depending on the degree of deterioration of the catalyst 13.
[0049] In this manner, the rotation control unit 16 rotates the catalyst 13 by a predetermined angle θ using the rotation mechanism 15 when the detected value of the oxygen storage amount of the catalyst 13 decreases by a predetermined value X or more compared to the value detected between the time the ignition switch IG was turned on and then turned off.
[0050] Thus, if the oxygen storage capacity of catalyst 13 decreases significantly, it is determined that the reaction state of catalyst 13 has deteriorated, and catalyst 13 is rotated by a predetermined angle θ. In this way, as shown in Figure 4, by gradually rotating catalyst 13 by a predetermined angle θ, the region of catalyst 13 that is struck by exhaust gas is changed to region RE0, region RE1, region RE2, etc., and the entire region of catalyst 13 can be utilized without bias to purify the exhaust gas. Therefore, the deterioration of catalyst 13 can be reduced more effectively, and the exhaust gas purification performance can be maintained.
[0051] Furthermore, if the oxygen storage capacity of catalyst 13 continues to decrease, it may be determined that motor 22 is malfunctioning.
[0052] In step S3, the rotation control unit 16 may also apply power to the motor 22 to rotate the catalyst 13 when the speed of the vehicle 201 becomes 0 and this state continues for a certain period of time.
[0053] In other words, in step S3, the rotation control unit 16 may rotate the catalyst 13 by a predetermined angle θ using the rotation mechanism 15 when it determines, based on the value detected by the vehicle speed sensor 112, that the vehicle 201 has remained stopped for a predetermined stopping time ST. The predetermined stopping time ST is, for example, 600 seconds.
[0054] This allows the catalyst 13 to be rotated at the point when the vehicle 201 remains stationary for a certain period of time, which would normally accelerate the deterioration of the catalyst 13. Furthermore, since the catalyst 13 is rotated while the vehicle 201 is stationary, the vibration of the vehicle 201 can suppress its influence on the rotation of the catalyst 13, allowing for stable rotation of the catalyst 13. As a result, the entire range of the catalyst 13 can be utilized without bias to purify the exhaust gas. Consequently, deterioration in areas of the catalyst 13 that are strongly hit by exhaust gas can be suppressed. Therefore, the deterioration of the catalyst 13 can be reduced, and the exhaust gas purification performance can be maintained.
[0055] As a first modification, the rotation control unit 16 may forcibly apply power to the motor 22 to rotate the catalyst 13 at the timing when the ignition switch IG of the vehicle 201 is turned off for each trip, regardless of the reaction state of the catalyst 13.
[0056] In other words, the rotation control unit 16 may rotate the catalyst 13 by a predetermined angle θ using the rotation mechanism 15 when the ignition switch IG is turned off, regardless of the reaction state of the catalyst 13.
[0057] This allows the catalytic converter 13 to rotate appropriately each time the ignition switch IG is turned off. Furthermore, since the ignition switch IG is off when the catalytic converter 13 is rotating, the influence of the exhaust gas flow on the rotation of the catalytic converter 13 can be suppressed, allowing the catalytic converter 13 to rotate stably. As a result, the entire range of the catalytic converter 13 can be utilized without bias to purify the exhaust gas. Consequently, deterioration of the catalytic converter 13 in areas where the exhaust gas hits are strong can be suppressed. Therefore, the deterioration of the catalytic converter 13 can be reduced, and the exhaust gas purification performance can be maintained.
[0058] As a second modification, the rotation control unit 16 may forcibly apply power to the motor 22 to rotate the catalyst 13 when steady-state driving (driving with a constant load) has been performed for a certain period of time or longer, regardless of the reaction state of the catalyst 13.
[0059] In other words, the rotation control unit 16 may, based on the value detected by the vehicle speed sensor 112, rotate the catalyst 13 by a predetermined angle θ using the rotation mechanism 15 when it determines that the vehicle 201 has been traveling at a predetermined speed V for a predetermined travel time DT.
[0060] This allows the catalyst 13 to be rotated at the point when the vehicle 201 is running at a constant speed for a certain period of time, which would accelerate the deterioration of the catalyst 13 (e.g., catalyst poisoning). Therefore, the entire range of the catalyst 13 can be utilized without bias to purify the exhaust gas. Consequently, deterioration in areas of the catalyst 13 that are strongly hit by the exhaust gas can be suppressed. Thus, the deterioration of the catalyst 13 can be reduced, and the exhaust gas purification performance can be maintained.
[0061] As a third modification, the catalyst 13 may be rotated regardless of the reaction state of the catalyst 13 when the increase in the accelerator opening of the vehicle 201 exceeds a certain amount and the vehicle 201 accelerates significantly. That is, the rotation control unit 16 may rotate the catalyst 13 by a predetermined angle θ using the rotation mechanism 15 when it determines, based on the value detected by the accelerator opening sensor 111, that the increase in the accelerator opening of the vehicle 201 per unit time is greater than or equal to a predetermined opening amount OA. The predetermined opening amount OA is, for example, 25%.
[0062] This makes it possible to suppress the deterioration of the catalyst 13 due to transient exhaust gases. In other words, when the accelerator pedal (not shown) of the vehicle 201 is pressed hard and the exhaust volume of the vehicle 201 is in a transient state, the catalyst 13 can be rotated at the timing when the catalyst 13 is more likely to deteriorate. As a result, the entire range of the catalyst 13 can be utilized without bias to purify the exhaust gas. Consequently, the deterioration of the catalyst 13 in the region where the exhaust gas hits it most strongly can be suppressed. Therefore, the deterioration of the catalyst 13 can be reduced and the exhaust gas purification performance can be maintained.
[0063] Furthermore, as shown in Figure 1, the exhaust gas purification device 1 may have a solar cell 18 that generates electricity to rotate the catalyst 13 and supplies it to the rotating mechanism 15. This solar cell 18 can be located anywhere that can receive sunlight, but for example, it is installed on the upper surface of the roof of the vehicle 201.
[0064] This allows the catalyst 13 to be rotated using electricity generated by the renewable energy source, the solar cell 18. Therefore, even in situations where there is no power source, electricity can be secured to rotate the catalyst 13.
[0065] It should be noted that the embodiments described above are merely illustrative examples and do not limit this disclosure in any way. Various improvements and modifications are possible without departing from the gist of the disclosure.
[0066] For example, the rotation control unit 16 may, regardless of the reaction state of the catalyst 13, forcibly rotate the catalyst 13 by a predetermined angle θ using the rotation mechanism 15 when the vehicle 201 on which the exhaust gas purification device 1 is installed remains stopped for a predetermined stop time ST.
[0067] Alternatively, instead of forming a gear on the upper surface 14Ba of the downstream ball bearing 14B, a gear may be formed on the outer circumferential surface of the catalyst 13. Then, the gear formed on the outer circumferential surface of the catalyst 13 may be meshed with the gear of the gear section 21 of the rotating mechanism 15, and by rotating the gear section 21, the catalyst 13 may be rotated around the center line CL. [Explanation of Symbols]
[0068] 1. Exhaust purifying device 11 cases 12 mat material 13 Catalyst 14 ball bearings 14A Upstream Ball Bearing 14B Downstream Ball Bearing 14Ba top surface 15 Rotation mechanism 16 Rotation Control Unit 17. Oxygen sensor 18 Solar Cells 21 Gear section 22 motors 101 Engine 102 Exhaust passage 111 Accelerator position sensor 112 Vehicle speed sensor 201 vehicles RE0 area RE1 area RE2 area FD Exhaust gas flow direction CL center line IG Ignition Switch X Predetermined value θ Predetermined angle ST Predetermined stop time V Predetermined speed DT (Scheduled Driving Time) OA Predetermined opening amount
Claims
1. A catalyst that purifies exhaust gases, A rotating mechanism for rotating the catalyst with the flow direction of the exhaust gas as its axis, A rotation control unit that controls the rotation mechanism, In an exhaust gas purification device having, It has a catalyst reaction state detection unit for detecting the reaction state of the catalyst, The rotation control unit controls the rotation of the catalyst by the rotation mechanism based on the detected value of the catalyst reaction state detection unit. An exhaust gas purification device characterized by the following.
2. In the exhaust gas purification device according to claim 1, The catalyst is located within the start converter. An exhaust gas purification device characterized by the following.
3. In the exhaust gas purification device according to claim 1 or 2, The detected value of the catalyst reaction state detection unit is the detected value of the oxygen storage amount of the catalyst. An exhaust gas purification device characterized by the following.
4. In the exhaust gas purification device according to claim 3, The rotation control unit rotates the catalyst using the rotation mechanism when the detected value of the oxygen storage amount of the catalyst decreases by a predetermined value or more compared to the value detected between the time the previous start switch was turned on and turned off in the vehicle on which the exhaust gas purification device is installed. An exhaust gas purification device characterized by the following.
5. A catalyst that purifies exhaust gases, A rotating mechanism for rotating the catalyst with the flow direction of the exhaust gas as its axis, A rotation control unit that controls the rotation mechanism, In an exhaust gas purification device having, The rotation control unit rotates the catalyst using the rotation mechanism when the start switch of the vehicle on which the exhaust gas purification device is installed is turned off. An exhaust gas purification device characterized by the following.
6. A catalyst that purifies exhaust gases, A rotating mechanism for rotating the catalyst with the flow direction of the exhaust gas as its axis, A rotation control unit that controls the rotation mechanism, In an exhaust gas purification device having, The rotation control unit rotates the catalyst using the rotation mechanism when the vehicle on which the exhaust gas purification device is installed remains stopped for a predetermined period of time. An exhaust gas purification device characterized by the following.
7. A catalyst that purifies exhaust gases, A rotating mechanism for rotating the catalyst with the flow direction of the exhaust gas as its axis, A rotation control unit that controls the rotation mechanism, In an exhaust gas purification device having, The rotation control unit rotates the catalyst by the rotation mechanism when the increase in the accelerator opening per unit time in a vehicle equipped with the exhaust gas purification device is equal to or greater than a predetermined opening amount. An exhaust gas purification device characterized by the following.
8. A catalyst that purifies exhaust gases, A rotating mechanism for rotating the catalyst with the flow direction of the exhaust gas as its axis, A rotation control unit that controls the rotation mechanism, In an exhaust gas purification device having, The rotation control unit rotates the catalyst by the rotation mechanism when the vehicle on which the exhaust gas purification device is installed is traveling at a predetermined speed for a predetermined time. An exhaust gas purification device characterized by the following.
9. In the exhaust gas purification device according to claim 1 or 2, The catalyst has a solar cell that generates electricity to rotate the catalyst and supplies it to the rotating mechanism. An exhaust gas purification device characterized by the following.