CN110145389B - Engine catalyst assembly and exhaust system - Google Patents

Engine catalyst assembly and exhaust system Download PDF

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Publication number
CN110145389B
CN110145389B CN201910474476.1A CN201910474476A CN110145389B CN 110145389 B CN110145389 B CN 110145389B CN 201910474476 A CN201910474476 A CN 201910474476A CN 110145389 B CN110145389 B CN 110145389B
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engine
catalyst
gas
communicated
gasoline engine
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CN201910474476.1A
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CN110145389A (en
Inventor
胡宏德
侯亦波
杨冰
张增光
冯玮玮
丁光辉
滕建耐
雷淋森
朱东升
张良超
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Anhui Jianghuai Automobile Group Corp
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Anhui Jianghuai Automobile Group Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/008—Mounting or arrangement of exhaust sensors in or on exhaust apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • F01N13/0097—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series the purifying devices are arranged in a single housing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/08—Other arrangements or adaptations of exhaust conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/14—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having thermal insulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1805—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2250/00—Combinations of different methods of purification
    • F01N2250/02—Combinations of different methods of purification filtering and catalytic conversion

Abstract

The invention relates to an engine catalyst assembly and an exhaust system. The catalyst assembly is arranged in an engine exhaust system and comprises a catalyst main body, and an air inlet structure and an air outlet structure which are respectively arranged at two ends of the catalyst main body; the catalyst main body comprises a catalyst shell, a three-way catalytic converter and a gasoline engine particle trap which are sequentially communicated and arranged in the catalyst shell, and a gas taking structure communicated with the gasoline engine particle trap; one end of the gas inlet structure is communicated with one end of an engine exhaust system, the other end of the gas inlet structure is communicated with the three-way catalytic converter, one end of the gas outlet structure is communicated with the gasoline engine particle trap, the other end of the gas outlet structure is communicated with the other end of the engine exhaust system, and the gas taking structure is communicated with an exhaust manifold of the engine. The invention has low cost, simple and convenient control, easy acquisition of gas for burning particles and easy reaching of the gas temperature to the required combustion temperature.

Description

Engine catalyst assembly and exhaust system
Technical Field
The invention relates to the technical field of automobile exhaust systems, in particular to an engine catalyst assembly and an exhaust system.
Background
The exhaust system of the automobile comprises an engine exhaust system and a chassis exhaust system, wherein the engine exhaust system is generally called as a hot end exhaust system for short, and the chassis exhaust system is called as a cold end exhaust system for short. In order to meet the requirements of the national six-emission regulation, a TWC (Three Way catalyst converter) is arranged in an exhaust system, and a GPF (Gasoline Particulate Filter) is packaged in the exhaust system, which becomes a mainstream technical route.
Currently, a TWC (three-way catalytic converter) is generally disposed on an exhaust system at the hot end of an engine to reduce CO, HC, and NO in emissionsX(ii) a And a GPF (gasoline engine particulate trap) is disposed on the cold end exhaust system to collect particulate emissions (soot) consisting of tiny particles of carbon or carbides (less than 4-20 μm in size) in the emissions. Moreover, after being gathered to a certain amount, the particulate matters in the GPF need to be burnt by high temperature, otherwise the particulate matters block the GPF, so that the capture efficiency is greatly reduced, and meanwhile, the exhaust back pressure is increased, thereby affecting the performance of the engine. At present, a set of electric heating device is usually added outside the GPF, and after the GPF reaches a certain temperature through heating, the particles are combusted and discharged, so that the particles in the GPF are removed. However, although the effect of removing the particles is good, the structure is complex, the cost is high, and the control is complex.
Disclosure of Invention
Based on the technical scheme, the invention provides the engine catalyst assembly and the exhaust system, which have the advantages of low cost, simplicity and convenience in control, easiness in obtaining gas for burning particles and easiness in reaching the temperature required by combustion.
In order to achieve the purpose, the invention provides the following technical scheme:
an engine catalyst assembly is arranged in an engine exhaust system and comprises a catalyst main body, and an air inlet structure and an air outlet structure which are respectively arranged at two ends of the catalyst main body;
the catalyst main body comprises a catalyst shell, a three-way catalytic converter and a gasoline engine particle trap which are sequentially communicated and arranged in the catalyst shell, and a gas taking structure communicated with the gasoline engine particle trap;
one end of the gas inlet structure is communicated with one end of an engine exhaust system, the other end of the gas inlet structure is communicated with the three-way catalytic converter, one end of the gas outlet structure is communicated with the gasoline engine particle trap, the other end of the gas outlet structure is communicated with the other end of the engine exhaust system, and the gas taking structure is communicated with an exhaust manifold of the engine.
Optionally, the air inlet structure comprises an air inlet flange connected with one end of an engine exhaust system, an air inlet elbow connected with the air inlet flange, and an air inlet taper pipe connected with the air inlet elbow, wherein the air inlet taper pipe is connected with one end of the catalyst shell.
Optionally, the air outlet structure comprises an air outlet flange connected with the other end of the engine exhaust system, an air outlet elbow connected with the air outlet flange, and an air outlet taper pipe connected with the air outlet elbow, wherein the air outlet taper pipe is connected with the other end of the catalyst shell.
Optionally, the included angle between the central axis of the air inlet flange and the central axis of the three-way catalytic converter is α, and is more than or equal to 45 degrees and less than or equal to α degrees and less than or equal to 180 degrees;
the central axis of the three-way catalytic converter is coincided with the central axis of the gasoline engine particle trap, the included angle between the central axis of the air outlet flange and the central axis of the gasoline engine particle trap is β, and β is more than or equal to 90 degrees and less than or equal to 180 degrees.
Optionally, the axial distance between the three-way catalytic converter and the gasoline engine particulate trap is set to be X, and X is more than or equal to 30mm and less than or equal to 60 mm.
Optionally, the gas taking structure comprises a first gas taking pipe and a second gas taking pipe which are communicated with an exhaust manifold of the engine, the first gas taking pipe is connected to the connection position of the gasoline engine particle trap and the three-way catalytic converter or connected to the gasoline engine particle trap, and the second gas taking pipe is connected to the connection position of the gasoline engine particle trap and the gas outlet structure or connected to the gas outlet structure.
Optionally, the gas taking structure further comprises a first gas taking mounting seat arranged on the catalyst shell, and the first gas taking pipe is arranged at the first gas taking mounting seat;
the gas taking structure further comprises a second gas taking mounting seat arranged on the gas outlet structure, and the second gas taking pipe is arranged at the second gas taking mounting seat.
Optionally, the air outlet structure further comprises a first sensor mounting seat arranged on the air inlet structure, and a second sensor mounting seat arranged on the air outlet structure.
Optionally, the catalyst housing comprises a cylindrical main housing, a heat insulation plate arranged outside the cylindrical main housing, and heat insulation cotton arranged between the cylindrical main housing and the heat insulation plate, wherein the three-way catalytic converter and the gasoline engine particle trap are arranged in the cylindrical main housing.
In addition, the invention also provides an exhaust system comprising the engine catalyst assembly.
According to the technical scheme provided by the invention, the air inlet structure and the air outlet structure of the catalyst assembly are arranged in an engine exhaust system, so that a three-way catalytic converter (TWC) and a gasoline engine particle trap (GPF) which are integrated in a catalyst shell are arranged at the hot end of an engine (namely the engine exhaust system), a gas taking structure can conveniently obtain high-temperature (over 600 ℃) gas from an engine exhaust manifold to burn and remove particles captured by the gasoline engine particle trap, an electric heating device is not required to be additionally arranged to burn the particles, the structure is simplified, and the catalyst assembly is also convenient to control. In addition, because the catalyst assembly sets up at the engine hot junction for it is nearer to get the gas structure apart from engine exhaust manifold, the distance that reduction high-temperature gas that can be very big carried, and it is less to make high-temperature gas reduce at transportation in-process temperature, thereby can conveniently obtain high-temperature gas from engine exhaust manifold and burn the particulate matter of cleaing away gasoline engine particle trap.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic illustration of a schematic perspective view of a catalyst assembly of an engine according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a three-dimensional structure of a catalyst assembly of an engine according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a three-dimensional structure of a catalyst assembly of an engine according to an embodiment of the present invention.
The reference numbers illustrate:
Figure BDA0002080620370000031
Figure BDA0002080620370000041
the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, back, top and bottom … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
As shown in fig. 1 to 3, the present invention provides an engine catalyst assembly disposed in an engine exhaust system, including a catalyst body 100, and an air inlet structure 200 and an air outlet structure 300 respectively disposed at two ends of the catalyst body 100. The catalyst body 100 includes the three-way catalytic converter 120 and the gasoline engine particulate trap 130 integrated together, so that the three-way catalytic converter 120 and the gasoline engine particulate trap 130 can be simultaneously disposed in the hot end of the engine (i.e., the exhaust system of the engine), thereby achieving the integrated arrangement of the three-way catalytic converter 120 and the gasoline engine particulate trap 130. Also, by connecting the intake structure 200 at one end of the catalyst main body 100 to one end of the engine exhaust system, it is possible to supply the engine exhaust gas to be purified into the catalyst main body 100; in addition, the air outlet structure 300 at the other end of the catalyst main body 100 is connected with the other end of the engine exhaust system or the under-chassis exhaust system (cold end) to output the purified gas out of the catalyst assembly and deliver the purified gas to the under-chassis exhaust system.
Specifically, the catalyst body 100 may include a catalyst housing 110, a three-way catalyst 120 and a gasoline engine particulate trap 130 sequentially communicated with each other in the catalyst housing 110, and a gas intake structure 400 communicated with the gasoline engine particulate trap 130. And one end of the air inlet structure 200 is communicated with one end of an engine exhaust system (namely an air inlet junction)Structure) is communicated with the three-way catalytic converter 120, one end of the gas outlet structure 300 is communicated with the gasoline engine particle trap 130, the other end (i.e., the gas outlet structure) is communicated with the other end of the engine exhaust system (or the other end of the gas outlet structure is communicated with the exhaust system under the chassis), and the gas taking structure 400 is communicated with the exhaust manifold of the engine. That is, the catalyst assembly is communicated with the exhaust system (i.e. hot end) of the engine through the air inlet structure 200 and the air outlet structure 300 arranged at two ends (or the air inlet structure is connected to the hot end, and the air outlet structure is connected to the cold end). Further, the three-way catalyst 120 and the gasoline engine particulate trap 130, which are sequentially provided in the catalyst housing 110, may separately treat CO, HC, and NO in the engine exhaust gas input through the intake structure 200XRemoval is carried out and particulate emissions (soot) consisting of carbon or carbide micro-particles (size less than 4-20 μm) are collected in the exhaust. Moreover, after the gasoline engine particulate trap 130 collects a certain amount of particulate matter, the gas intake structure 400 introduces high-temperature gas from the exhaust manifold of the engine to burn and eliminate the particulate matter captured by the gasoline engine particulate trap 130. Therefore, the three-way catalytic converter 120 and the gasoline engine particle trap 130 are integrated on the hot end, so that the gasoline engine particle trap 130 and the gas taking structure 400 are close to the exhaust manifold of the engine, the gas taking structure 400 can more conveniently obtain high-temperature (over 600 ℃) gas from the exhaust manifold of the engine, and the temperature loss of the high-temperature gas is less (the temperature above 600 ℃ can be kept) in the process of conveying the high-temperature gas to the gasoline engine particle trap 130 through the gas taking structure 400, so that the normal and complete combustion elimination of the particulate matters captured by the gasoline engine particle trap 130 can be ensured.
Further, the catalyst housing 110 may include a cylindrical main housing, a heat insulating plate disposed outside the cylindrical main housing, and heat insulating wool disposed between the cylindrical main housing and the heat insulating plate, and the three-way catalytic converter 120 and the gasoline engine particulate trap 130 are sequentially disposed in the cylindrical main housing. Furthermore, the cylindrical main housing may further include a converter housing and a trap housing connected to each other, wherein the converter housing is used for accommodating the three-way catalytic converter 120, and the trap housing is used for accommodating the gasoline engine particle trap 130, so that the three-way catalytic converter 120 and the gasoline engine particle trap 130 with different shapes and sizes can be accommodated and positioned more conveniently. In addition, the cylindrical main housing may house the three-way catalytic converter 120 and the gasoline engine particulate trap 130, facilitating integration of the two together. And through set up the heat insulating board that corresponds with the appearance of the main casing of tube-shape outside the main casing of tube-shape, can insulate against heat to catalyst converter assembly, avoid the high fever that its internal combustion process produced to cause the influence to external structure. In addition, through set up thermal-insulated cotton between the two, not only can further play thermal-insulated effect, still can play the cushioning effect. In addition, the heat insulation board can be designed into a split structure, namely a plurality of (including two or more) heat insulation sub-boards are surrounded outside the cylindrical main shell, the edges of two adjacent heat insulation sub-boards can be welded and connected, or the edge of each heat insulation sub-board is welded on the surface of the cylindrical main shell, and connection structures such as screws are not needed for fixing. Like this, can reduce material cost and assembly cost, can make the thermal-insulated cotton thickness of packing big and compact simultaneously, separation exhaust noise that can be fine promotes the NVH nature of engine.
In addition, in another embodiment, the catalyst housing 110 may include only a heat insulating plate surrounding the three-way catalyst 120 and the gasoline engine particulate trap 130, and heat insulating cotton interposed between the heat insulating plate and the three-way catalyst 120 (and the gasoline engine particulate trap 130). In the same way, the heat insulation plate can also be of a split type structure and can also be of an integral type cylindrical structure. Also, the shape of the heat shield plate corresponds to the outer shapes of the three-way catalytic converter 120 and the gasoline engine particulate trap 130.
In addition, the catalyst assembly may further include a fixing frame 500 disposed on the catalyst housing 110, and the entire catalyst assembly may be fixed to other structures through the fixing frame 500. Specifically, the fixing frame 500 includes a fixing plate configured in an arc shape, and connecting plates disposed at both ends of the fixing plate. The fixing plate can be attached to the surface of the heat insulation plate and can be welded and connected with the heat insulation plate, so that the fixing frame and the catalytic converter assembly are firmly and reliably connected. In addition, can set up the connecting hole on the connecting plate, on accessible connecting bolt is fixed in other structures with the connecting plate to realize the fixed connection of mount and other structures. Moreover, the catalyst assembly may include one fixing bracket disposed on the catalyst housing, or may include a plurality of fixing brackets disposed on the catalyst housing 110.
In addition, the intake structure 200 may include an intake flange 210 connected to an end of an exhaust system of the engine, an intake elbow 220 connected to the intake flange 210, and an intake cone 230 connected to the intake elbow 220, the intake cone 230 being connected to an end of the catalyst housing 110. Through setting up air intake flange 210, be convenient for carry out butt joint fixed with engine exhaust system. By providing the intake elbow 220 and the intake cone 230, the engine exhaust gas is smoothly introduced into the three-way catalytic converter 120 provided in the catalyst housing 110. Also, the intake cone 230 may be coupled to a cylindrical main housing top of the catalyst housing 110 or a top of the heat shield plate to be integrated with the catalyst housing 110. Moreover, the structure of the inlet cone 230 may correspond to the structure of the catalyst housing 110, that is, the inlet cone 230 may also include a main cone body correspondingly connected to the cylindrical main housing, a cone insulation board correspondingly connected to the insulation board of the catalyst housing 110 and disposed outside the main cone body, and insulation cotton disposed between the main cone body and the cone insulation board.
Furthermore, the air outlet structure 300 may include an air outlet flange 330 connected to the other end of the engine exhaust system (or the exhaust system under the chassis), an air outlet elbow 320 connected to the air outlet flange 330, and an air outlet cone 310 connected to the air outlet elbow 320, wherein the air outlet cone 310 is connected to the other end of the catalyst housing 110. The air outlet flange 330 is arranged to facilitate the butt joint and fixation with an engine exhaust system (or an exhaust system under a chassis). And the exhaust elbow 320 and the exhaust taper pipe 310 are arranged, so that the engine exhaust processed by the three-way catalytic converter 120 and the gasoline engine particle trap 130 can be smoothly introduced into an engine exhaust system (or a lower chassis exhaust system). Also, the outlet cone 310 may be correspondingly coupled to the bottom of the cylindrical main housing of the catalyst housing 110 or the bottom of the heat shield plate to be integrated with the catalyst housing. Similarly, the structure of the outlet cone 310 may also correspond to the structure of the catalyst housing 110, that is, the outlet cone 310 may also include a main cone body correspondingly connected to the cylindrical main housing, a cone thermal insulation board correspondingly connected to the thermal insulation board of the catalyst housing 110 and disposed outside the main cone body, and thermal insulation cotton disposed between the main cone body and the cone thermal insulation board.
Moreover, the included angle between the central axis of the intake flange 210 and the central axis of the three-way catalytic converter 120 is α, and α is more than or equal to 45 degrees and less than or equal to 180 degrees, and the central axis of the three-way catalytic converter 120 coincides with the central axis of the gasoline engine particle trap 130, and the included angle between the central axis of the exhaust flange 330 and the central axis of the gasoline engine particle trap 130 is β, and β is more than or equal to 90 degrees and less than or equal to 180 degrees.
In addition, the gas intake structure 400 may include a first gas intake pipe 410 and a second gas intake pipe 420 which are communicated with an exhaust manifold of the engine, wherein the first gas intake pipe 410 is connected to a connection position of the gasoline engine particulate trap 130 and the three-way catalytic converter 120 or connected to the gasoline engine particulate trap 130, and the second gas intake pipe 420 is connected to a connection position of the gasoline engine particulate trap 130 and the gas outlet structure 300 or connected to the gas outlet structure 300. Can connect respectively at gasoline engine particle trap 130 head and the tail both ends and set up an air intake pipe, can follow the both ends input high temperature gas of gasoline engine particle trap 130, carry out abundant burning to the particulate matter of catching in gasoline engine particle trap 130 for eliminate more thoroughly to the particulate matter, the elimination effect to the particulate matter can be better promptly. In addition, the gas intake structure 400 may only include the first gas intake pipe 410, and the first gas intake pipe 410 may be disposed at the top of the gasoline engine particle trap 130 or at the middle of the gasoline engine particle trap 130.
Specifically, one end of the first gas extraction pipe 410 may be communicated with an exhaust manifold, and the other end of the first gas extraction pipe 410 may be communicated with the catalyst housing 110 at a middle position where the gasoline engine particle trap 130 and the three-way catalytic converter 120 are connected, or may be directly communicated with the top (i.e., head) of the gasoline engine particle trap 130 through the catalyst housing 110, so as to introduce high-temperature gas in the exhaust manifold into the top of the gasoline engine particle trap 130, and may burn and eliminate particulate matter trapped in the gasoline engine particle trap 130. Moreover, one end of the second gas intake pipe 420 can be communicated with the exhaust manifold, and the other end of the second gas intake pipe 420 can pass through the catalyst housing 110 to be directly communicated with the bottom (i.e. the tail) of the gasoline engine particle trap 130, and can also be communicated with the gas outlet taper pipe 310 or the gas outlet elbow pipe 320 of the gas outlet structure 300, so that high-temperature gas in the exhaust manifold can be conveniently introduced into the tail of the gasoline engine particle trap 130, and unburned particulate matters can be burned and removed again.
In addition, the gas intake structure 400 may further include a first gas intake mounting seat provided on the catalyst housing 110, where the first gas intake pipe 410 is installed. Through set up first gas-taking mount pad on catalyst housing 110, be convenient for fix in this first gas-taking mount pad department with the one end installation of first gas-taking pipe 410 to make first gas-taking pipe 410 pass catalyst housing inner wall, and communicate with gasoline engine particle trap 130 top, be convenient for carry high temperature gas in to gasoline engine particle trap 130 steadily and reliably. Moreover, the air intake structure 400 may further include a second air intake mounting seat disposed on the air outlet structure 300, and the second air intake pipe 420 is disposed at the second air intake mounting seat. Similarly, through set up the second on structure 300 of giving vent to anger and get the gas mount pad, be convenient for get the one end installation of gas pipe 420 with the second and be fixed in this for getting gas mount pad department to make the first for getting the gas pipe pass the structure inner wall of giving vent to anger, and with gasoline engine particle trap 130 afterbody intercommunication, be convenient for steadily and reliably carry high temperature gas to gasoline engine particle trap 130 afterbody.
In addition, the catalyst assembly may further include a first sensor mount disposed on the air inlet structure 200 (air inlet elbow or air inlet cone) and a second sensor mount disposed on the air outlet structure 300 (air outlet elbow or full cone). A front oxygen sensor may be mounted on the air inlet structure by the first sensor mount and a rear oxygen sensor may be mounted on the air outlet structure by the second sensor mount. The oxygen potential in the catalyst assembly can be measured by the front oxygen sensor and the rear oxygen sensor, the corresponding oxygen concentration is calculated by the chemical balance principle, and the combustion air-fuel ratio is monitored and controlled to ensure that the product quality and the tail gas emission reach the standard.
In addition, the invention also provides an exhaust system comprising the engine catalyst assembly. According to the technical scheme provided by the invention, the air inlet structure and the air outlet structure of the catalyst assembly are arranged in an engine exhaust system, so that a three-way catalytic converter (TWC) and a gasoline engine particle trap (GPF) which are integrated in a catalyst shell are arranged at the hot end of an engine (namely the engine exhaust system), a gas taking structure can conveniently obtain high-temperature (over 600 ℃) gas from an engine exhaust manifold to burn and remove particles captured by the gasoline engine particle trap, an electric heating device is not required to be additionally arranged to burn the particles, the structure is simplified, and the catalyst assembly is also convenient to control. In addition, because the catalyst assembly sets up at the engine hot junction for it is nearer to get the gas structure apart from engine exhaust manifold, the distance that reduction high-temperature gas that can be very big carried, and it is less to make high-temperature gas reduce at transportation in-process temperature, thereby can conveniently obtain high-temperature gas from engine exhaust manifold and burn the particulate matter of cleaing away gasoline engine particle trap.
Therefore, the GPF is arranged at the hot end of the engine by utilizing a reasonable structural design, so that the engine catalyst assembly forms a tightly coupled catalyst packaging assembly structure of the TWC and the GPF, the problem of active regeneration of particulate matters of the GPF is solved, and the material cost and the calibration cost of the whole vehicle are reduced. Moreover, the integrated design of the catalyst heat insulation plate and the catalyst shell improves the NVH performance of the engine, and simultaneously reduces the assembly cost and the material cost.
The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (9)

1. An engine catalyst assembly is arranged in an engine exhaust system and is characterized by comprising a catalyst main body, and an air inlet structure and an air outlet structure which are respectively arranged at two ends of the catalyst main body;
the catalyst main body comprises a catalyst shell, a three-way catalytic converter and a gasoline engine particle trap which are sequentially communicated and arranged in the catalyst shell, and a gas taking structure communicated with the gasoline engine particle trap;
one end of the gas inlet structure is communicated with one end of an engine exhaust system, the other end of the gas inlet structure is communicated with the three-way catalytic converter, one end of the gas outlet structure is communicated with the gasoline engine particle trap, the other end of the gas outlet structure is communicated with the other end of the engine exhaust system, and the gas taking structure is communicated with an exhaust manifold of an engine;
the gas taking structure comprises a first gas taking pipe and a second gas taking pipe which are communicated with an exhaust manifold of the engine, the first gas taking pipe is connected with the connection position of the gasoline engine particle trap and the three-way catalytic converter or connected with the gasoline engine particle trap, and the second gas taking pipe is connected with the connection position of the gasoline engine particle trap and the gas outlet structure or connected with the gas outlet structure.
2. The engine catalyst assembly of claim 1, wherein the air intake structure comprises an intake flange connected to an end of an engine exhaust system, an intake elbow connected to the intake flange, and an intake cone connected to the intake elbow, the intake cone connected to an end of the catalyst housing.
3. The engine catalyst assembly of claim 2, wherein the exhaust structure comprises an exhaust flange connected to the other end of the engine exhaust system, an exhaust elbow connected to the exhaust flange, and an exhaust cone connected to the exhaust elbow, the exhaust cone being connected to the other end of the catalyst housing.
4. The engine catalyst assembly of claim 3, wherein the angle between the central axis of the intake flange and the central axis of the three-way catalytic converter is α and 45 ° ≦ α ≦ 180 °;
the central axis of the three-way catalytic converter is coincided with the central axis of the gasoline engine particle trap, the included angle between the central axis of the air outlet flange and the central axis of the gasoline engine particle trap is β, and β is more than or equal to 90 degrees and less than or equal to 180 degrees.
5. The engine catalyst assembly of claim 3, wherein an axial spacing between the three-way catalytic converter and the gasoline engine particulate trap is X, and 30mm ≦ X ≦ 60 mm.
6. The engine catalyst assembly of claim 1, wherein the air extraction structure further comprises a first air extraction mount disposed on the catalyst housing, the first air extraction tube being disposed at the first air extraction mount;
the gas taking structure further comprises a second gas taking mounting seat arranged on the gas outlet structure, and the second gas taking pipe is arranged at the second gas taking mounting seat.
7. The engine catalyst assembly of any of claims 1 to 5, further comprising a first sensor mount disposed on the air intake structure and a second sensor mount disposed on the air outlet structure.
8. The engine catalyst assembly according to any one of claims 1 to 5, wherein the catalyst housing includes a cylindrical main housing, a heat insulating plate provided outside the cylindrical main housing, and heat insulating cotton provided between the cylindrical main housing and the heat insulating plate, the three-way catalytic converter and the gasoline engine particulate trap being provided in the cylindrical main housing.
9. An exhaust system comprising an engine catalyst assembly according to any one of claims 1 to 8.
CN201910474476.1A 2019-05-31 2019-05-31 Engine catalyst assembly and exhaust system Active CN110145389B (en)

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CN110778382A (en) * 2019-10-18 2020-02-11 浙江达峰汽车技术有限公司 Gasoline engine tail gas catalytic purification system meeting national emission standards of six countries
CN110700927A (en) * 2019-10-18 2020-01-17 浙江达峰汽车技术有限公司 Four-effect gasoline engine tail gas catalytic purification system meeting national six-emission standard
CN110966066A (en) * 2019-12-04 2020-04-07 郑州日产汽车有限公司 Pick-up truck coupling type catalytic converter
CN111396176A (en) * 2020-04-16 2020-07-10 昆明云内动力股份有限公司 Catalyst for engine combustion development stage and processing method
CN111322137A (en) * 2020-04-16 2020-06-23 柳州利和排气控制系统有限公司 Three way catalyst converter packaging hardware
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CN114215634A (en) * 2021-11-15 2022-03-22 岚图汽车科技有限公司 TWC and GPF tightly-coupled hot end catalyst for transverse front-row supercharged engine

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