CN211598859U - Exhaust system of engine and engine - Google Patents
Exhaust system of engine and engine Download PDFInfo
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- CN211598859U CN211598859U CN201922494241.7U CN201922494241U CN211598859U CN 211598859 U CN211598859 U CN 211598859U CN 201922494241 U CN201922494241 U CN 201922494241U CN 211598859 U CN211598859 U CN 211598859U
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Abstract
The utility model discloses an exhaust system of an engine, which is applied to a multi-cylinder engine and comprises a main exhaust pipe, an EGR gas taking pipe and a first bypass pipeline, wherein the exhaust ends of partial cylinders of the engine are communicated with the gas inlet end of a turbine of a turbocharger through the main exhaust pipe, the exhaust ends of the rest cylinders are communicated with the gas inlet side of the engine through the EGR gas taking pipe, and the opening degree of the EGR gas taking pipe communicated to the gas inlet side of the engine is adjustable; one end of the first bypass pipeline is arranged on the EGR gas taking pipe, the other end of the first bypass pipeline is connected to a connecting pipeline between the exhaust end of the turbine and the aftertreatment, and the opening degree of the first bypass pipeline for the connecting pipeline is adjustable. In the application process of the exhaust system, when the aftertreatment temperature is higher, the EGR gas taking pipe is connected with the cylinder and only used for EGR driving, the opening degree of the conduction of the EGR gas taking pipe to the air inlet side of the engine is adjusted to be the maximum, and efficient EGR rate control is realized.
Description
Technical Field
The utility model relates to an it advances exhaust technical field to start, especially relates to an exhaust system and engine of engine.
Background
Exhaust gas recirculation is an emission control technique in which a portion of the exhaust gas produced by a diesel or gasoline engine is directed out of the exhaust line and an appropriate amount of exhaust gas is directed into the intake line through a control valve (e.g., an EGR valve) to mix with fresh air and then into the combustion chamber to participate in combustion. Because the waste gas contains a large amount of CO2And CO2Can not burn but absorb a large amount of heat, thereby reducing the combustion temperature of the mixed gas in the cylinder and further reducing NOXThe amount of production of (c). However, the upgrading of the exhaust emission standard and the aging problem of the aftertreatment system make the diesel engine need to improve the EGR rate, but under the condition that the specification of the supercharger is certain (namely, the pressure ratio of the supercharger is certain), the improvement of the EGR rate is difficult.
In view of the above, the problem of how to increase the EGR rate has become a technical problem that needs to be solved urgently by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an exhaust system and engine of engine to promote the EGR rate of engine.
In order to achieve the above object, the present invention provides an exhaust system of an engine, which is applied to a multi-cylinder engine, and comprises a main exhaust pipe, an EGR gas intake pipe and a first bypass pipeline, wherein exhaust ends of some cylinders of the engine are communicated with an intake end of a turbine of a turbocharger through the main exhaust pipe, exhaust ends of the other cylinders are communicated with an intake side of the engine through the EGR gas intake pipe, and an opening degree of the EGR gas intake pipe communicated to the intake side of the engine is adjustable; one end of the first bypass pipeline is arranged on the EGR gas taking pipe, the other end of the first bypass pipeline is connected to a connecting pipeline between the exhaust end of the turbine and the aftertreatment, and the opening degree of the first bypass pipeline is adjustable to the connecting pipeline.
Preferably, an EGR valve is arranged on the EGR gas intake pipe, the EGR valve is located downstream of the connection position of the first bypass pipeline, and a first bypass valve is arranged on the first bypass pipeline.
Preferably, a three-way valve is arranged at a connection position of the EGR gas taking pipe and the first bypass line.
Preferably, an EGR cooler is further provided in the EGR gas intake pipe, and the EGR cooler is located downstream of the connection point of the first bypass line.
Preferably, the engine is a four-cylinder engine, wherein the exhaust end of one cylinder is communicated with the air inlet side of the engine through an EGR intake pipe, and the exhaust ends of the other three cylinders are communicated with the air inlet side of the turbine through the main exhaust pipe.
Preferably, the engine is a six-cylinder engine, wherein the exhaust ends of two cylinders communicate with the intake side of the engine through an EGR intake pipe, and the exhaust ends of the other four cylinders communicate with the intake end of the turbine through the main exhaust pipe.
Compared with the introduction content of the background technology, the exhaust system of the engine is applied to a multi-cylinder engine and comprises a main exhaust pipe, an EGR (exhaust gas recirculation) intake pipe and a first bypass pipeline, wherein the exhaust ends of part of cylinders of the engine are communicated with the air inlet end of a turbine of a turbocharger through the main exhaust pipe, the exhaust ends of the rest of cylinders are communicated with the air inlet side of the engine through the EGR intake pipe, and the opening degree of the EGR intake pipe communicated to the air inlet side of the engine is adjustable; one end of the first bypass pipeline is arranged on the EGR gas taking pipe, the other end of the first bypass pipeline is connected to a connecting pipeline between the exhaust end of the turbine and the aftertreatment, and the opening degree of the first bypass pipeline for the connecting pipeline is adjustable. In the actual working process of the exhaust system, in order to ensure that the SCR temperature is quickly improved to achieve higher conversion efficiency in the starting process of an engine cold machine, the tail gas of an EGR gas taking pipe is quickly bypassed to post-treatment through a first bypass pipeline, the opening degree of the conduction of the EGR gas taking pipe to the air inlet side of the engine is adjusted to be zero or smaller, the opening degree of the conduction of the first bypass pipeline to a connecting pipeline between the exhaust end of a turbine and the post-treatment is adjusted to be maximum or larger, most of the waste gas of the EGR gas taking pipe can be bypassed to the post-treatment, the temperature of the post-treatment is quickly improved, and therefore the SCR conversion efficiency and the DPF regeneration temperature are improved; when the aftertreatment temperature is higher, the EGR gas taking pipe is connected with the cylinder and only used as EGR drive, the opening degree of the communication of the EGR gas taking pipe to the air inlet side of the engine is adjusted to be maximum, and the opening degree of the communication of the first bypass pipe to the connecting pipe between the exhaust end of the turbine and the aftertreatment is adjusted to be smaller or zero, so that the efficient EGR rate control is realized, and the aim of reducing NOx is fulfilled.
In addition, the utility model also provides an engine, including air intake system and exhaust system, it is and this exhaust system is the exhaust system that any above-mentioned scheme described. Since the exhaust system has the technical effects, an engine having the exhaust system also has corresponding technical effects, which are not described herein again.
Preferably, the intake system includes a mixer provided on an intake side of the engine, and the fresh air intake pipe and the EGR gas take pipe communicate with an intake end of the engine through the mixer.
Preferably, an auxiliary supercharger is further arranged between the air inlet end of the engine and the mixer.
Preferably, a second bypass pipeline is connected in parallel between the air inlet of the auxiliary supercharger and the exhaust port of the auxiliary supercharger.
Drawings
Fig. 1 is a schematic structural diagram of an exhaust system of a four-cylinder engine according to an embodiment of the present invention, in which an independent EGR valve and a first bypass valve are adopted;
fig. 2 is a schematic structural diagram of an exhaust system EGR gas intake pipe of a four-cylinder engine according to an embodiment of the present invention, in which a three-way valve is adopted;
FIG. 3 is a schematic diagram of an exhaust system of a six-cylinder engine according to an embodiment of the present invention, in which an independent EGR valve and a first bypass valve are used;
fig. 4 is a schematic structural diagram of an exhaust system EGR gas intake pipe of a six-cylinder engine according to an embodiment of the present invention, in which a three-way valve is adopted;
fig. 5 is a schematic structural view of an auxiliary supercharger arranged on an air intake system of an engine provided by an embodiment of the present invention.
In the above-described figures 1-5,
the system comprises a main exhaust pipe 1, an EGR gas taking pipe 2, a first bypass pipeline 3, an engine 4, a turbine 5, aftertreatment 6, a connecting pipeline 7, an EGR valve 8, a first bypass valve 9, a three-way valve 10, an EGR cooler 11, a mixer 12, a fresh air inlet pipe 13, an auxiliary supercharger 14, a second bypass pipeline 15 and a second bypass valve 16.
Detailed Description
The core of the utility model is to provide an exhaust system and engine of engine to promote the EGR rate of engine.
In order to make those skilled in the art better understand the technical solutions provided by the present invention, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1-5, an exhaust system of an engine according to an embodiment of the present invention is applied to a multi-cylinder engine, and includes a main exhaust pipe 1, an EGR gas intake pipe 2 and a first bypass pipeline 3, exhaust ends of some cylinders of the engine 4 are communicated with an intake end of a turbine 5 of a turbocharger through the main exhaust pipe 1, exhaust ends of the other cylinders are communicated with an intake side of the engine 4 through the EGR gas intake pipe 2, and an opening degree of the EGR gas intake pipe 2 communicated with the intake side of the engine 4 is adjustable; one end of the first bypass line 3 is provided on the EGR gas taking pipe 2, the other end of the first bypass line 3 is connected to a connecting line 7 between the exhaust end of the turbine 5 and the aftertreatment 6, and the opening degree of the first bypass line 3 to the connecting line 7 is adjustable.
In the actual working process of the exhaust system, in order to ensure that the SCR temperature is quickly improved to achieve higher conversion efficiency in the starting process of an engine cold machine, the tail gas of an EGR gas taking pipe is quickly bypassed to post-treatment through a first bypass pipeline, the opening degree of the conduction of the EGR gas taking pipe to the air inlet side of the engine is adjusted to be zero or smaller, the opening degree of the conduction of the first bypass pipeline to a connecting pipeline between the exhaust end of a turbine and the post-treatment is adjusted to be maximum or larger, most of the waste gas of the EGR gas taking pipe can be bypassed to the post-treatment, the temperature of the post-treatment is quickly improved, and therefore the SCR conversion efficiency and the DPF regeneration temperature are improved; when the aftertreatment temperature is higher, the EGR gas taking pipe is connected with the cylinder and only used as EGR drive, the opening degree of the communication of the EGR gas taking pipe to the air inlet side of the engine is adjusted to be maximum, and the opening degree of the communication of the first bypass pipe to the connecting pipe between the exhaust end of the turbine and the aftertreatment is adjusted to be smaller or zero, so that the efficient EGR rate control is realized, and the aim of reducing NOx is fulfilled.
It should be noted that, as will be understood by those skilled in the art, EGR, also called exhaust gas recirculation, is a process of reintroducing exhaust gas from an engine into an intake pipe to mix with fresh air and then entering a combustion chamber for combustion, which is effective in reducing engine NOx emissions.
The aftertreatment may specifically include DOC, DPF and SCR. Wherein DOC is Diesel Oxidation Catalyst, an Oxidation catalytic converter, a Diesel vehicle exhaust aftertreatment technology, and is mainly used for removing volatile organic compounds in particles through Oxidation reaction of a Catalyst and reducing PM emission; a DPF, a Diesel Particulate Filter, a device installed in the exhaust system of a Diesel vehicle for reducing Particulate Matter (PM) in the exhaust gas by filtering; selective Catalytic Reduction (SCR), an aftertreatment device that reduces NOx emissions.
In some specific embodiments, the opening degree of the communication of the EGR gas taking pipe to the intake side of the engine is adjusted, specifically, an EGR valve 8 is provided on the EGR gas taking pipe 2, and the EGR valve 8 is located downstream of the connection position of the first bypass pipeline 3; the first bypass line may be provided with a first bypass valve 9, and the opening degree of the first bypass line is adjusted to a connection line between the exhaust end of the turbine and the aftertreatment. The trend of tail gas in the EGR gas taking pipe can be conveniently and accurately controlled by respectively controlling the opening degrees of the EGR valve and the first bypass valve, and different purposes can be achieved by controlling different trend modes. The EGR valve and the first bypass valve are respectively connected with the vehicle control unit, and the temperature is detected by the corresponding sensor, so that the control of tail gas in the EGR gas taking pipe according to requirements can be realized.
It should be noted that, the above-mentioned manner of providing the corresponding control valves on the EGR gas taking pipe and the first bypass pipe is only a preferred example of the embodiment of the present invention, and in practical application, the three-way valve 10 may be provided at a connection position of the EGR gas taking pipe 2 and the first bypass pipe 3. Through the mode that sets up a three-way valve, can realize the effect of two control valves through a valve body, can practice thrift the cost on the one hand, another convenience makes control more convenient, has saved the occupation control of valve body.
In a further embodiment, in order to avoid the temperature of the exhaust gas directly exhausted from the cylinder entering the intake side of the engine again through the EGR gas taking pipe being too high, an EGR cooler 11 is generally provided on the EGR gas taking pipe 2, and the EGR cooler 11 is located downstream of the connection position of the first bypass line 3.
In some more specific embodiments, the exhaust system of the engine may be applied to a four-cylinder engine, and specifically, the exhaust end of one of the cylinders may communicate with the intake side of the engine 4 through the EGR gas intake pipe 2, and the exhaust ends of the other three cylinders may communicate with the intake end of the turbine 5 through the main exhaust pipe 1. The arrangement enables the tail gas exhausted by one of the cylinders to be specially used for EGR control, and the EGR control is more convenient. It will of course be appreciated that in practice, for a four-cylinder engine, two of the cylinders of the four-cylinder engine may be dedicated for communication with the EGR take-off, and the other two cylinders may be in communication with the intake of the turbine via the main exhaust pipe, when there is a higher demand for EGR control.
In other specific embodiments, the exhaust system of the engine can also be applied to a six-cylinder engine, and for the six-cylinder engine, it is generally adopted that the exhaust ends of two cylinders are communicated with the air inlet side of the engine 4 through the EGR gas intake pipe 2, and the exhaust ends of the other four cylinders are communicated with the air inlet side of the turbine 5 through the main exhaust pipe 1. It is understood that the above-mentioned arrangement of using two cylinders exclusively for EGR gas taking is merely a preferred example of the embodiment of the present invention, and in practical application, when there is a higher required EGR rate, three or four cylinders may be provided to exclusively take EGR gas, which is not limited herein; of course, when the demand of the EGR rate is low, for a six-cylinder engine, only one of the cylinders can be selected to be dedicated for EGR gas extraction, and in practical application, the selection can be performed according to the actual demand.
In addition, the utility model also provides an engine, including air intake system and exhaust system, it is and this exhaust system is the exhaust system that any above-mentioned scheme described. Since the exhaust system has the technical effects, an engine having the exhaust system also has corresponding technical effects, which are not described herein again.
In a further embodiment, the above intake system generally specifically includes a mixer 12 disposed on the intake side of the engine 4, and the fresh air intake pipe 13 and the EGR gas intake pipe 2 communicate with the intake end of the engine 4 through the mixer 12. In general, fresh air passes through an air cleaner, is pressurized by a compressor of a turbocharger, and then enters a mixer through a fresh air inlet pipe 13, and generally passes through an intercooler before entering the mixer, so the fresh air inlet pipe 13 is generally provided with the intercooler.
For an engine adopting comparison of power and torque requirements, the working capacity is reduced by using a single cylinder (EGR cylinder) as an EGR driving cylinder, and in order to avoid the problem, an auxiliary supercharger 14 can be further arranged between the air inlet end of the engine 4 and the mixer 12, so that the air inlet quantity of the engine is increased. The auxiliary supercharger may be a mechanical supercharger or an electric supercharger, and may be selected according to actual requirements in the actual application process. In addition, it should be noted that the specific application scenario of adding the auxiliary supercharger may be applied to a six-cylinder engine, and may also be applied to a four-cylinder engine, and is not limited specifically herein.
In a further embodiment, a second bypass line 15 is connected in parallel between the intake port of the auxiliary supercharger 14 and the exhaust port of the auxiliary supercharger 14, and a second bypass valve 16 for adjusting the opening degree of communication is provided in the second bypass line 15. Therefore, by controlling the opening and closing of the second bypass valve, the flexible switching between the intervention and the quitting of the auxiliary supercharger can be controlled, and flexible control is realized.
The above is to the exhaust system and the engine of the engine provided by the present invention. It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities. Also, in this document, terms such as "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in an article or device that comprises the element.
The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the core concepts of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.
Claims (10)
1. An exhaust system of an engine is applied to a multi-cylinder engine and is characterized by comprising a main exhaust pipe (1), an EGR (exhaust gas recirculation) pipe (2) and a first bypass pipeline (3), wherein the exhaust ends of a part of cylinders of the engine (4) are communicated with the air inlet end of a turbine (5) of a turbocharger through the main exhaust pipe (1), the exhaust ends of the rest of cylinders are communicated with the air inlet side of the engine (4) through the EGR air intake pipe (2), and the opening degree of the EGR air intake pipe (2) communicated to the air inlet side of the engine (4) is adjustable; one end of the first bypass pipeline (3) is arranged on the EGR gas taking pipe (2), the other end of the first bypass pipeline (3) is connected to a connecting pipeline (7) between the exhaust end of the turbine (5) and the aftertreatment (6), and the opening degree of the first bypass pipeline (3) communicated with the connecting pipeline (7) is adjustable.
2. An exhaust system of an engine according to claim 1, characterized in that an EGR valve (8) is provided on the EGR take-off pipe (2), and the EGR valve (8) is located downstream of the connection of the first bypass line (3), and a first bypass valve (9) is provided on the first bypass line (3).
3. The exhaust system of an engine according to claim 1, characterized in that a three-way valve (10) is provided at a connection position of the EGR gas take-out pipe (2) and the first bypass line (3).
4. The exhaust system of an engine according to claim 1, characterized in that an EGR cooler (11) is further provided on the EGR take-off pipe (2), and the EGR cooler (11) is located downstream of the connection point of the first bypass line (3).
5. The exhaust system of an engine according to any one of claims 1 to 4, wherein the engine (4) is a four-cylinder engine in which the exhaust end of one cylinder communicates with the intake side of the engine (4) through an EGR take pipe (2), and the exhaust ends of the other three cylinders communicate with the intake end of the turbine (5) through the main exhaust pipe (1).
6. The exhaust system of an engine according to any one of claims 1 to 4, characterized in that the engine (4) is a six-cylinder engine in which the exhaust ends of two cylinders communicate with the intake side of the engine (4) through an EGR take-off pipe (2) and the exhaust ends of the other four cylinders communicate with the intake end of the turbine (5) through the main exhaust pipe (1).
7. An engine comprising an air intake system and an exhaust system, wherein the exhaust system is an exhaust system according to any one of claims 1 to 6.
8. An engine according to claim 7, characterized in that the intake system comprises a mixer (12) arranged on the intake side of the engine (4), and the fresh air intake pipe (13) and the EGR intake pipe (2) communicate with the intake end of the engine (4) through the mixer (12).
9. An engine according to claim 8, characterized in that an auxiliary supercharger (14) is also arranged between the intake of the engine (4) and the mixer (12).
10. An engine according to claim 9, characterized in that a second bypass line (15) is connected in parallel between the inlet of the auxiliary supercharger (14) and the outlet of the auxiliary supercharger (14).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922494241.7U CN211598859U (en) | 2019-12-31 | 2019-12-31 | Exhaust system of engine and engine |
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| CN201922494241.7U CN211598859U (en) | 2019-12-31 | 2019-12-31 | Exhaust system of engine and engine |
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| CN211598859U true CN211598859U (en) | 2020-09-29 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112211759A (en) * | 2020-10-14 | 2021-01-12 | 哈尔滨工程大学 | Gas engine detonation suppression device and suppression method thereof |
| CN112377338A (en) * | 2020-11-04 | 2021-02-19 | 哈尔滨工程大学 | Wide watershed three-stage adjustable exhaust gas recirculation system |
| CN115387938A (en) * | 2022-09-22 | 2022-11-25 | 潍柴动力股份有限公司 | Engine EGR system, vehicle and engine EGR control method |
-
2019
- 2019-12-31 CN CN201922494241.7U patent/CN211598859U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112211759A (en) * | 2020-10-14 | 2021-01-12 | 哈尔滨工程大学 | Gas engine detonation suppression device and suppression method thereof |
| CN112377338A (en) * | 2020-11-04 | 2021-02-19 | 哈尔滨工程大学 | Wide watershed three-stage adjustable exhaust gas recirculation system |
| CN115387938A (en) * | 2022-09-22 | 2022-11-25 | 潍柴动力股份有限公司 | Engine EGR system, vehicle and engine EGR control method |
| CN115387938B (en) * | 2022-09-22 | 2024-03-19 | 潍柴动力股份有限公司 | Engine EGR system, vehicle and engine EGR control method |
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