CN212774480U

CN212774480U - Vehicle and engine exhaust system thereof

Info

Publication number: CN212774480U
Application number: CN202021305180.1U
Authority: CN
Inventors: 靳志辉; 关荣
Original assignee: Chongqing Cummins Engine Co Ltd
Current assignee: Chongqing Cummins Engine Co Ltd
Priority date: 2020-07-06
Filing date: 2020-07-06
Publication date: 2021-03-23
Anticipated expiration: 2030-07-06

Abstract

The application discloses a vehicle and an engine exhaust system thereof, wherein the engine exhaust system comprises an exhaust manifold, a bypass pipeline and an ETV valve; wherein the exhaust manifold is provided with a first exhaust port and a second exhaust port for connection with an inlet of a turbine in the turbocharger; the bypass pipeline comprises a pipeline first inlet communicated with the first exhaust port, a pipeline second inlet used for being connected with the outlet of the turbine and a pipeline outlet used for being connected with the inlet of the aftertreatment system; the ETV valve is disposed in the bypass line and is used to control the flow of exhaust gas through the bypass line. The ETV valve has the advantages that the arrangement of the ETV valve is changed, the section of the ETV valve is reduced on the premise that the exhaust temperature of an engine is controlled, the ETV valve is easy to manufacture, and the cost of the ETV valve is reduced.

Description

Vehicle and engine exhaust system thereof

Technical Field

The present application relates to the field of vehicle technology, and more particularly, to an engine exhaust system. Furthermore, the application also relates to a vehicle comprising the engine exhaust system.

Background

The exhaust system of existing diesel engines is arranged with two common structures:

first, high temperature exhaust gas from the combustion of the engine is exhausted to an aftertreatment system through an exhaust manifold and a supercharger. However, the method cannot realize effective control of the exhaust temperature of the engine, cannot meet the requirements of an exhaust gas aftertreatment system, and is commonly used in engines with emission requirements below six countries or below four non-road countries.

Second, high-temperature exhaust gas after combustion of the engine is exhausted after passing through an exhaust manifold, a supercharger and an exhaust throttle valve (called an ETV valve for short), the arrangement is commonly used for engines meeting the emission requirements of the sixth stage on a Chinese road (called the sixth state for short) or the fourth stage on a Chinese non-road (called the fourth state on the non-road) and the ETV valve can control the exhaust temperature required by the engine under various working conditions, so that the exhaust temperature can reach the temperature required by the operation of an aftertreatment system, and the emission requirements are met. However, in this way, because the ETV valve is installed at the rear end of the turbocharger volute, the exhaust section of the ETV valve needs to be matched with the exhaust outlet of the turbine, so that the exhaust section is large, and further, the structural sizes of the control motor, the valve body and the like are increased, and the cost is high. In addition, the rear end of the ETV valve is fixedly connected with the exhaust pipe, and the exhaust pipe is communicated with the aftertreatment system, so that once the ETV valve fails, fastening screws and hoops at the front end and the rear end need to be detached, and the problem of inconvenience in maintenance and service is caused.

In summary, how to reduce the cross section of the ETV valve on the premise of satisfying the requirement of "realizing the control of the exhaust temperature of the engine" is a problem to be solved urgently by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

In view of the above, an object of the present application is to provide an engine exhaust system, which can reduce the cross section of an ETV valve, is easy to manufacture, and reduces the cost by changing the arrangement of the ETV valve on the premise of satisfying the requirement of "controlling the engine exhaust temperature". It is another object of the present application to provide a vehicle including the engine exhaust system described above.

In order to achieve the above purpose, the present application provides the following technical solutions:

an engine exhaust system comprising:

an exhaust manifold provided with a first exhaust port and a second exhaust port for connection to an inlet of the turbine;

a bypass line including a line first inlet in communication with the first exhaust port, a line second inlet for connection with an outlet of the turbine, and a line outlet for connection with an inlet of an aftertreatment system;

and the ETV valve is arranged on the bypass pipeline and is used for controlling the exhaust gas flow of the bypass pipeline.

Optionally, the ETV valve is disposed between the first inlet of the conduit and the first exhaust port.

Optionally, the bypass pipeline includes an exhaust joint, a corrugated pipe and a three-way joint, the exhaust joint is tubular, a first end of the exhaust joint is connected with the ETV valve, and a second end of the exhaust joint is connected with a first end of the corrugated pipe; and the first end of the three-way joint is connected with the second end of the corrugated pipe, the second end of the three-way joint is the second inlet of the pipeline, and the third end of the three-way joint is the outlet of the pipeline.

Optionally, the ETV valve is provided with a bolt mounting hole, and the first end of the exhaust joint and the first exhaust port are fixed by a bolt located in the bolt mounting hole.

Optionally, two ends of the corrugated pipe are connected with the second end of the exhaust connector and the first end of the three-way connector through anchor ears respectively.

Optionally, the second inlet of the pipeline is provided with a hoop for connecting with the outlet of the turbine.

Optionally, the number of the bolt mounting holes is four.

Optionally, the turbine engine further comprises a control system electrically connected to the ETV valve, the control system is configured to increase the opening degree of the ETV valve when an aftertreatment temperature of the aftertreatment system is lower than a preset temperature, and the control system is configured to decrease the opening degree of the ETV valve when a rotation speed of the turbine is higher than a preset rotation speed.

A vehicle, comprising: the inlet of a turbine of the turbocharger is connected with a second exhaust port of the engine exhaust system, the outlet of the turbine is connected with a second inlet of a pipeline of the engine exhaust system, the inlet of the exhaust pipe is connected with an outlet of the pipeline of the engine exhaust system, and the outlet of the exhaust pipe is connected with an inlet of the aftertreatment system.

Through above-mentioned scheme, the engine exhaust system that this application provided's beneficial effect lies in:

the application provides an engine exhaust system comprising an exhaust manifold, a bypass line and an ETV valve; the first exhaust port of the exhaust manifold is connected with the first inlet of the pipeline of the bypass pipeline, the second exhaust port of the exhaust manifold is connected with the inlet of the turbine, the second inlet of the pipeline of the bypass pipeline is connected with the outlet of the turbine, the pipeline outlet of the bypass pipeline is connected with the inlet of the post-treatment system, and the ETV valve is arranged in the bypass pipeline and controls the flow rate of the exhaust gas of the bypass pipeline by changing the opening degree of the ETV valve.

During operation, if the ETV valve is closed, exhaust gas in the exhaust manifold enters the aftertreatment system through the turbine; if the ETV valve is opened, part or all of the exhaust gas in the exhaust manifold bypasses the turbine and directly enters the aftertreatment through the bypass pipeline, and the temperature of the exhaust gas in the aftertreatment system can be adjusted by adjusting the opening of the ETV valve.

The ETV valve is arranged in a changed mode, the ETV valve and the turbine are arranged in parallel, the ETV valve is connected with the exhaust manifold, the ETV valve does not need to be matched with the size of an outlet of the turbine in the prior art, therefore, the section of the ETV valve is reduced on the premise that the exhaust temperature of the engine is controlled, the ETV valve is easy to manufacture, and the cost of the ETV valve is reduced.

Further, it should be appreciated that the present application provides a vehicle that includes the engine exhaust system described above, and therefore, the vehicle provided by the present application also has the beneficial effects described above.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic diagram of an engine exhaust system according to an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of the engine exhaust system of FIG. 1 mated with a turbocharger.

The reference numbers in the figures are: an exhaust manifold 1, a first exhaust port 1a, a second exhaust port 1 b; an ETV valve 2; a bypass pipeline 3, an exhaust joint 31, a corrugated pipe 32, a three-way joint 33, a pipeline first inlet 3a, a pipeline second inlet 3b and a pipeline outlet 3 c; a turbocharger 4, a turbine 41, and a compressor 42.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, 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 application.

Referring to fig. 1 and 2, the present application provides an engine exhaust system that may include: an exhaust manifold 1, a bypass line 3 and an ETV valve 2.

The exhaust manifold 1 includes branch pipes connected to cylinders of the engine, and a header pipe in which exhaust gas from each cylinder is collected by each branch pipe, and the header pipe is provided with two exhaust gas outlets, one of which is a first exhaust port 1a, and the other of which is a second exhaust port 1b for connection to an inlet of the turbine 41.

The bypass line 3 has three connections, two of which are a first line inlet 3a communicating with the first exhaust port 1a, a second line inlet 3b connecting with the outlet of the turbine 41 and a line outlet 3c connecting with the inlet of the aftertreatment system.

Wherein, in one embodiment, the bypass line 3 comprises an exhaust joint 31, a bellows 32 and a three-way joint 33. The exhaust joint 31 is tubular, a first end of the exhaust joint 31 is connected with the ETV valve 2, and a second end of the exhaust joint 31 is connected with a first end of the corrugated pipe 32 through a hoop or other mechanical structures; the first end of the three-way joint 33 is connected with the second end of the corrugated pipe 32 through an anchor ear or other mechanical structures, the second end of the three-way joint 33 is a second pipeline inlet 3b, the second pipeline inlet 3b can be provided with an anchor ear to be connected with an outlet of the turbine 41, and the third end of the three-way joint 33 is a pipeline outlet 3 c. After the corrugated pipe 32 is adopted, under the condition that the three joint positions of the bypass pipeline 3 are fixed, the shape of the bypass pipeline 3 can be flexibly adjusted by using the deformation of the corrugated pipe 32, and the arrangement of the bypass pipeline 3 in the vehicle is convenient.

The ETV valve 2 comprises a valve core, a valve seat and the like, the ETV valve 2 is arranged on the bypass pipeline 3, and the ETV valve 2 controls the flow rate of the exhaust gas in the bypass pipeline 3 by changing the opening degree of the ETV valve 2.

Wherein, in one embodiment, the ETV valve 2 is arranged at one end of the bypass line 3, e.g. the ETV valve 2 is arranged between the line first inlet 3a and the first exhaust port 1 a. It will be appreciated that in other embodiments, the ETV valve 2 may be located in a central position in the bypass line 3.

In another embodiment, a bolt mounting hole is formed in the valve seat of the ETV valve 2, the first end of the exhaust joint 31 and the first exhaust port 1a are fixed by a bolt, and the bolt passes through the bolt mounting hole in the valve seat. The bolt mounting holes are generally arranged in a plurality of, for example, four, bolt holes are spaced apart in the edge region of the valve seat. When in actual use, the ETV valve 2 is connected with the exhaust manifold 1 and the exhaust joint 31 through bolts, and once a fault occurs, the maintenance of the ETV valve 2 can be realized only by dismounting the bolts, so that the maintenance convenience is improved.

Further, in order to optimize the use effect of the engine exhaust system, on the basis of any one of the above embodiments, the engine exhaust system further comprises a control system, wherein the control system is electrically connected with the ETV valve 2 and controls the opening degree of the ETV valve 2. The control system is adapted to increase the opening of the ETV valve 2 when the aftertreatment temperature of the aftertreatment system is below a preset temperature, and the control system is adapted to decrease the opening of the ETV valve 2 when the rotational speed of the turbine 41 is above a preset rotational speed.

During operation, the control system may be embodied as an electronic control unit (abbreviated as "ECU") of the vehicle. In the low-speed operation stage of the engine, the ETV valve 2 is in a default closing state, so that the combustion tail gas of the engine completely flows through the turbine 41 and is used for pushing the turbocharger 4 to do work; when the ECU detects that the temperature of the tail gas needs to be raised by the aftertreatment system, the ETV valve 2 is opened, so that the high-temperature tail gas directly enters the aftertreatment device through the bypass device without passing through the turbocharger 4. In the high-speed running stage of the engine, when the ECU detects that the rotating speed of the turbocharger 4 is too high, the ECU controls the opening angle of the ETV valve 2 in real time to avoid the rotating speed of the turbocharger 4 from exceeding the limit value and protect the turbocharger 4.

As can be seen from the above embodiments, the engine exhaust system provided by the present application has the following beneficial effects: this application changes the arrangement of ETV valve 2, opens the back at ETV valve 2, and whole or partial tail gas in the exhaust manifold 1 does not pass through turbo charger 4 and directly is in by bypass line 3 drainage to aftertreatment system, under the realization is to engine exhaust temperature control prerequisite, reduces the exhaust cross section for the whole size of ETV valve 2 reduces, reduces the cost of ETV valve 2 to the requirement of control motor.

In addition to above-mentioned engine exhaust system, the utility model discloses still provide a vehicle, this vehicle includes turbo charger 4, blast pipe, aftertreatment system and any kind of engine exhaust system of the aforesaid, wherein, turbo charger 4 includes coaxial fixed compressor 42 and turbine 41, the import of turbine 41 is connected with engine exhaust system's second gas vent 1b, the export of turbine 41 is connected with engine exhaust system's pipeline second import 3b, the import of blast pipe is connected with engine exhaust system's pipeline export 3c, the export of blast pipe and aftertreatment system's access connection. Due to the adoption of the engine exhaust system, the vehicle can not only give consideration to the low-speed/high-speed performance of the engine, but also meet the emission requirements of the national six or the non-road national four. For the structure of other parts of the vehicle, please refer to the prior art, and the description is omitted here.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The vehicle and the engine exhaust system thereof provided by the application are described in detail above. The principles and embodiments of the present application are explained herein using specific examples, which are provided only to help understand the method and the core idea of the present application. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.

Claims

1. An engine exhaust system, comprising:

an exhaust manifold (1) provided with a first exhaust port (1a) and a second exhaust port (1b) for connection with an inlet of a turbine (41) in a turbocharger (4);

a bypass line (3) comprising a line first inlet (3a) communicating with the first exhaust port (1a), a line second inlet (3b) for connection with an outlet of the turbine (41), and a line outlet (3c) for connection with an inlet of an aftertreatment system;

and the ETV valve (2) is arranged on the bypass pipeline (3) and is used for controlling the exhaust gas flow of the bypass pipeline (3).

2. An engine exhaust system according to claim 1, characterized in that the ETV valve (2) is provided between the line first inlet (3a) and the first exhaust port (1 a).

3. The engine exhaust system according to claim 2, characterized in that the bypass line (3) comprises an exhaust joint (31), a bellows (32) and a three-way joint (33), the exhaust joint (31) being tubular, the exhaust joint (31) being connected at a first end to the ETV valve (2) and at a second end to a first end of the bellows (32); and the first end of the three-way joint (33) is connected with the second end of the corrugated pipe (32), the second end of the three-way joint is the second inlet (3b) of the pipeline, and the third end of the three-way joint is the outlet (3c) of the pipeline.

4. An engine exhaust system according to claim 3, characterized in that the ETV valve (2) is provided with bolt mounting holes, and the first end of the exhaust joint (31) and the first exhaust port (1a) are fixed by bolts in the bolt mounting holes.

5. The engine exhaust system according to claim 4, characterized in that both ends of the bellows (32) are connected with the second end of the exhaust joint (31) and the first end of the three-way joint (33) by hoops, respectively.

6. Engine exhaust system according to claim 5, characterized in that the pipe second inlet (3b) is provided with a hoop for connection with the outlet of the turbine (41).

7. The engine exhaust system according to claim 6, wherein there are four bolt mounting holes.

8. The engine exhaust system according to any one of claims 1 to 7, further comprising a control system electrically connected to the ETV valve (2), the control system being configured to increase the opening of the ETV valve (2) when an aftertreatment temperature of the aftertreatment system is below a preset temperature, the control system being configured to decrease the opening of the ETV valve (2) when a rotational speed of the turbine (41) is above a preset rotational speed.

9. A vehicle, characterized by comprising: a turbocharger (4), an exhaust pipe, an aftertreatment system and an engine exhaust system according to any one of claims 1 to 8, an inlet of a turbine (41) of the turbocharger (4) being connected to a second exhaust port (1b) of the engine exhaust system, an outlet of the turbine (41) being connected to a second inlet (3b) of a conduit of the engine exhaust system, an inlet of the exhaust pipe being connected to a conduit outlet (3c) of the engine exhaust system, an outlet of the exhaust pipe being connected to an inlet of the aftertreatment system.