Exhaust manifold, engine and vehicle
Through the coordination of the asymmetrically designed exhaust manifold and control valve, the problem of poor fuel economy in diesel engine EGR technology is solved, high EGR rate and good low-speed power are achieved, and the overall performance of the engine is improved.
Patent Information
- Application Number
- CN202421872708.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-05
- Publication Date
- 2025-07-18
- Estimated Expiration
- 2034-08-05
AI Technical Summary
After using EGR technology, existing diesel engines have poor fuel economy and are difficult to meet high EGR rates and good low-speed power at the same time.
The exhaust manifold with an asymmetric design is adopted. The number of communication between small-flow pipes and large-flow pipes is controlled under different working conditions through the control valve, ensuring the exhaust gas balance under different working conditions, reducing pump gas losses, and improving the gas withdrawal capacity of the EGR cooling system.
While increasing the EGR rate, the fuel economy and low-speed power of the engine are improved, ensuring efficient operation of the engine under different operating conditions.
Smart Images
Figure CN223120005U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of engines, and more specifically, to an exhaust manifold, an engine and a vehicle. Background Art
[0002] With the continuous development of technology and the continuous improvement of requirements, the development difficulty of diesel engines is increasing. In order to reduce the after-treatment pressure, many models adopt the exhaust gas recirculation technology to reduce the original NOx emissions of diesel engines. Especially for off-road models, the purchase cost is particularly concerned. In order to reduce the cost of diesel engines, diesel engines usually adopt EGR (Exhaust Gas Recirculation) related structures, and then meet the current development requirements through in-cylinder purification technology. For conventional models with EGR, in order to achieve the target EGR rate, measures such as reducing the flow rate of the turbine or calibrating the intake throttle valve are usually adopted. However, the above measures will bring problems such as poor fuel economy of the engine. Summary of the Utility Model
[0003] In view of this, the utility model provides an exhaust manifold, an engine and a vehicle, effectively solving the technical problems existing in the prior art, and on the basis of improving the EGR rate, ensuring high fuel economy and excellent low-speed power performance during the operation of the engine.
[0004] To achieve the above object, the technical solution provided by the utility model is as follows:
[0005] An exhaust manifold, the exhaust manifold includes:
[0006] The first exhaust pipe to the Nth exhaust pipe, where N is an even number greater than 2;
[0007] A small flow channel pipe and a large flow channel pipe;
[0008] And a control valve, the control valve is arranged between the exhaust outlets of the first exhaust pipe to the Nth exhaust pipe and the flow channel inlets of the small flow channel pipe and the large flow channel pipe. Wherein, when the control valve is in the first working state, it controls the exhaust outlets of the first exhaust pipe to the ith exhaust pipe to be communicated with the flow channel inlet of the small flow channel pipe, and controls the exhaust outlets of the (i + 1)th exhaust pipe to the Nth exhaust pipe to be communicated with the flow channel inlet of the large flow channel pipe, where i is a positive integer less than N / 2; and when the control valve is in the second working state, it controls the exhaust outlets of the first exhaust pipe to the jth exhaust pipe to be communicated with the flow channel inlet of the small flow channel pipe, and controls the exhaust outlets of the (j + 1)th exhaust pipe to the Nth exhaust pipe to be communicated with the flow channel inlet of the large flow channel pipe, where j is N / 2.
[0009] Optionally, the exhaust outlets of the first exhaust pipe to the (j - 1)-th exhaust pipe are communicated with the flow channel inlet of the small flow channel pipe, and the exhaust outlets of the (j + 1)-th exhaust pipe to the N-th exhaust pipe are communicated with the flow channel inlet of the large flow channel pipe;
[0010] The control valve is arranged between the exhaust outlet of the j-th exhaust pipe and the flow channel inlets of the small flow channel pipe and the large flow channel pipe.
[0011] Optionally, the control valve includes a control valve rod. One end of the control valve rod is arranged between the flow channel inlets of the small flow channel pipe and the large flow channel pipe, and the other end of the control valve rod is arranged at the exhaust outlet of the j-th exhaust pipe;
[0012] In the first working state, the control valve rod blocks the communication between the exhaust outlet of the j-th exhaust pipe and the flow channel inlet of the small flow channel pipe, and conducts the communication between the exhaust outlet of the j-th exhaust pipe and the flow channel inlet of the large flow channel pipe; and in the second working state, the control valve rod blocks the communication between the exhaust outlet of the j-th exhaust pipe and the flow channel inlet of the large flow channel pipe, and conducts the communication between the exhaust outlet of the j-th exhaust pipe and the flow channel inlet of the small flow channel pipe.
[0013] Optionally, the control valve includes a first valve and a second valve. The first valve is arranged between the flow channel inlet of the small flow channel pipe and the exhaust outlet of the j-th exhaust pipe, and the second valve is arranged between the flow channel inlet of the large flow channel pipe and the exhaust outlet of the j-th exhaust pipe;
[0014] In the first working state, the first valve is closed and the second valve is conducted; and in the second working state, the first valve is conducted and the second valve is closed.
[0015] Based on the same inventive concept, the present utility model further provides an engine, which includes:
[0016] The first cylinder to the N-th cylinder, where N is an even number greater than 2;
[0017] An intake manifold, which is communicated with the intake ends of the first cylinder to the N-th cylinder;
[0018] An exhaust manifold, the exhaust manifold including a first exhaust pipe to an Nth exhaust pipe, a small flow channel pipe, a large flow channel pipe, and a control valve, the control valve being disposed between the exhaust outlets of the first exhaust pipe to the Nth exhaust pipe and the flow channel inlets of the small flow channel pipe and the large flow channel pipe, wherein, in a first operating state, the control valve controls the exhaust outlets of the first exhaust pipe to the ith exhaust pipe to communicate with the flow channel inlet of the small flow channel pipe, and controls the exhaust outlets of the (i + 1)th exhaust pipe to the Nth exhaust pipe to communicate with the flow channel inlet of the large flow channel pipe, i being a positive integer less than N / 2; and in a second operating state, the control valve controls the exhaust outlets of the first exhaust pipe to the jth exhaust pipe to communicate with the flow channel inlet of the small flow channel pipe, and controls the exhaust outlets of the (j + 1)th exhaust pipe to the Nth exhaust pipe to communicate with the flow channel inlet of the large flow channel pipe, j being N / 2;
[0019] A turbine, the intake side of the turbine being in communication with the flow channel outlets of the small flow channel pipe and the large flow channel pipe;
[0020] And, an EGR cooling system, the EGR cooling system being connected between the intake manifold and the small flow channel pipe.
[0021] Optionally, the exhaust outlets of the first exhaust pipe to the (j - 1)th exhaust pipe communicate with the flow channel inlet of the small flow channel pipe, and the exhaust outlets of the (j + 1)th exhaust pipe to the Nth exhaust pipe communicate with the flow channel inlet of the large flow channel pipe;
[0022] The control valve is disposed between the exhaust outlet of the jth exhaust pipe and the flow channel inlets of the small flow channel pipe and the large flow channel pipe.
[0023] Optionally, the control valve includes a control valve stem, one end of the control valve stem being disposed between the flow channel inlet of the small flow channel pipe and the flow channel inlet of the large flow channel pipe, and the other end of the control valve stem being disposed at the exhaust outlet of the jth exhaust pipe;
[0024] In the first operating state, the control valve stem blocks the communication between the exhaust outlet of the jth exhaust pipe and the flow channel inlet of the small flow channel pipe, and conducts the communication between the exhaust outlet of the jth exhaust pipe and the flow channel inlet of the large flow channel pipe; and in the second operating state, the control valve stem blocks the communication between the exhaust outlet of the jth exhaust pipe and the flow channel inlet of the large flow channel pipe, and conducts the communication between the exhaust outlet of the jth exhaust pipe and the flow channel inlet of the small flow channel pipe.
[0025] Optionally, the control valve includes a first valve and a second valve, the first valve being disposed between the flow channel inlet of the small flow channel pipe and the exhaust outlet of the jth exhaust pipe, and the second valve being disposed between the flow channel inlet of the large flow channel pipe and the exhaust outlet of the jth exhaust pipe;
[0026] In the first working state, the first valve is closed and the second valve is open; and in the second working state, the first valve is open and the second valve is closed.
[0027] Based on the same inventive concept, the present utility model further provides a vehicle, which includes the above-mentioned engine.
[0028] Optionally, the vehicle includes a car.
[0029] Compared with the prior art, the technical solution provided by the present utility model has at least the following advantages:
[0030] The present utility model provides an exhaust manifold, an engine and a vehicle. The exhaust manifold includes: a first exhaust pipe to an Nth exhaust pipe, where N is an even number greater than 2; a small flow channel pipe and a large flow channel pipe; and a control valve, which is arranged between the exhaust outlets of the first exhaust pipe to the Nth exhaust pipe and the flow channel inlets of the small flow channel pipe and the large flow channel pipe. Among them, in the first working state, the control valve controls the exhaust outlets of the first exhaust pipe to the ith exhaust pipe to communicate with the flow channel inlet of the small flow channel pipe, and controls the exhaust outlets of the (i + 1)th exhaust pipe to the Nth exhaust pipe to communicate with the flow channel inlet of the large flow channel pipe, where i is a positive integer less than N / 2; and in the second working state, the control valve controls the exhaust outlets of the first exhaust pipe to the jth exhaust pipe to communicate with the flow channel inlet of the small flow channel pipe, and controls the exhaust outlets of the (j + 1)th exhaust pipe to the Nth exhaust pipe to communicate with the flow channel inlet of the large flow channel pipe, where j is N / 2.
[0031] As can be seen from the above, in the technical solution provided by the embodiment of the present utility model, the asymmetrically designed exhaust manifold is applied to the engine. In the first working state, the number of exhaust pipes connected to the small flow channel pipe is less than the number of exhaust pipes connected to the large flow channel pipe, so that the exhaust of the small flow channel pipe and the large flow channel pipe is balanced, the pumping loss is small, and the fuel economy of the engine is good; while in the second working state, the number of exhaust pipes connected to the small flow channel pipe is the same as the number of exhaust pipes connected to the large flow channel pipe. At this time, the total exhaust volume of the small flow channel pipe and the large flow channel pipe is equal, and the intake pre-pressure of the small flow channel pipe is higher than the intake pre-pressure of the large flow channel pipe, so that the pressure difference between the pre-turbine pressure and the post-intercooler pressure corresponding to the small flow channel pipe side increases, the air intake capacity of the EGR cooling system increases, the EGR rate is increased, and the low-speed emission and power performance of the engine are ensured to be excellent. Description of the Drawings
[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the provided drawings.
[0033] Figure 1 Structural schematic diagram of an exhaust manifold provided by an embodiment of the present application;
[0034] Figure 2 Structural schematic diagram of another exhaust manifold provided by an embodiment of the present application;
[0035] Figure 3 Structural schematic diagram of yet another exhaust manifold provided by an embodiment of the present application;
[0036] Figure 4 Structural schematic diagram of an engine provided by an embodiment of the present application;
[0037] Figure 5 Structural schematic diagram of another engine provided by an embodiment of the present application;
[0038] Figure 6 Structural schematic diagram of yet another engine provided by an embodiment of the present application. Detailed implementation manners
[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.
[0040] As described in the background art, in order to reduce the cost of diesel engines, EGR-related structures are usually adopted, and then in-cylinder purification technology is used to meet the current development needs. For conventional engines using EGR, in order to achieve the target EGR rate, measures such as reducing the flow rate of the turbine or calibrating the intake throttle valve are usually adopted. However, the above measures will bring problems such as poor fuel economy of the engine.
[0041] Based on this, the embodiments of the present application provide an exhaust manifold, an engine and a vehicle, effectively solving the technical problems existing in the prior art, and ensuring high fuel economy and excellent low-speed power performance during the operation of the engine while increasing the EGR rate.
[0042] To achieve the above object, the technical solutions provided by the embodiments of the present application are as follows, specifically combined withFigures 1 to 6 A detailed description is provided for the technical solutions of the embodiments of the present application.
[0043] Refer to Figure 1 As shown, it is a schematic structural diagram of an exhaust manifold provided by the embodiments of the present application. Among them, the exhaust manifold provided by the embodiments of the present application includes:
[0044] The first exhaust pipe 101 to the Nth exhaust pipe 10n, where N is an even number greater than 2; a small flow channel pipe 110 and a large flow channel pipe 120, the flow cross-section of the small flow channel pipe 110 is smaller than that of the large flow channel pipe 102; and a control valve 130, the control valve 130 is arranged between the exhaust outlets of the first exhaust pipe 101 to the Nth exhaust pipe 10n and the flow inlets of the small flow channel pipe 110 and the large flow channel pipe 120. Among them, when the control valve 130 is in the first working state, it controls the exhaust outlets of the first exhaust pipe 101 to the ith exhaust pipe (not shown) to be communicated with the flow inlet of the small flow channel pipe, and controls the exhaust outlets of the (i + 1)th exhaust pipe (not shown) to the Nth exhaust pipe 10n to be communicated with the flow inlet of the large flow channel pipe 120, where i is a positive integer less than N / 2; and when the control valve 130 is in the second working state, it controls the exhaust outlets of the first exhaust pipe 101 to the jth exhaust pipe (not shown) to be communicated with the flow inlet of the small flow channel pipe, and controls the exhaust outlets of the (j + 1)th exhaust pipe (not shown) to the Nth exhaust pipe 10n to be communicated with the flow inlet of the large flow channel pipe 120, where j is N / 2.
[0045] It can be understood that for the technical solutions provided by the embodiments of the present application, an exhaust manifold similar to an asymmetric design is applied to the engine. In the first working state, the number of exhaust pipes connected to the small flow channel pipe is less than the number of exhaust pipes connected to the large flow channel pipe, thereby making the exhaust of the small flow channel pipe and the large flow channel pipe balanced, with less pumping loss and good fuel economy of the engine; while in the second working state, the number of exhaust pipes connected to the small flow channel pipe is the same as the number of exhaust pipes connected to the large flow channel pipe. At this time, the total exhaust volume of the small flow channel pipe and the large flow channel pipe is equal, and the pre-intake pressure of the small flow channel pipe is higher than the pre-intake pressure of the large flow channel pipe, making the pressure difference between the pressure in front of the turbine corresponding to the small flow channel pipe side and the pressure after the intercooler increase, increasing the air intake capacity of the EGR cooling system, improving the EGR rate, and ensuring excellent low-speed emissions and power performance of the engine.
[0046] In an embodiment of the present application, the exhaust outlets of the first exhaust pipe to the (j - 1)th exhaust pipe provided in the embodiment of the present application are communicated with the flow channel inlet of the small flow channel pipe, and the exhaust outlets of the (j + 1)th exhaust pipe to the Nth exhaust pipe are communicated with the flow channel inlet of the large flow channel pipe; the control valve is arranged between the exhaust outlet of the jth exhaust pipe and the flow channel inlets of the small flow channel pipe and the large flow channel pipe. That is, when the control valve provided in the embodiment of the present application is in the first working state, the number of exhaust pipes communicated with the small flow channel pipe is one less than the number of exhaust pipes communicated with the large flow channel pipe. The control valve only needs to be arranged at the exhaust outlet of the jth exhaust pipe and the flow channel inlets of the small flow channel pipe and the large flow channel pipe, and the communication state between the exhaust pipe and the flow channel pipe in the first working state and the second working state of the control valve can be realized without large-scale improvement of the exhaust manifold.
[0047] Optionally, the control valve provided in the embodiment of the present application includes a control valve rod. One end of the control valve rod is arranged between the flow channel inlet of the small flow channel pipe and the flow channel inlet of the large flow channel pipe, and the other end of the control valve rod is arranged at the exhaust outlet of the jth exhaust pipe; when in the first working state, the control valve rod blocks the communication between the exhaust outlet of the jth exhaust pipe and the flow channel inlet of the small flow channel pipe, and conducts the communication between the exhaust outlet of the jth exhaust pipe and the flow channel inlet of the large flow channel pipe; and when in the second working state, the control valve rod blocks the communication between the exhaust outlet of the jth exhaust pipe and the flow channel inlet of the large flow channel pipe, and conducts the communication between the exhaust outlet of the jth exhaust pipe and the flow channel inlet of the small flow channel pipe.
[0048] Specifically refer to Figure 2 As shown, it is a schematic structural diagram of another exhaust manifold provided in the embodiment of the present application. The exhaust manifold is described by taking N as 6 as an example, and j is 3. The exhaust outlets of the first exhaust pipe 101 and the second exhaust pipe 102 are communicated with the flow channel inlet of the small flow channel pipe 110, and the exhaust outlets of the fourth exhaust pipe 104, the fifth exhaust pipe 105 and the sixth exhaust pipe 106 are connected to the flow channel inlet of the large flow channel pipe 120. The control valve includes a control valve rod 131. One end of the control valve rod 131 is arranged between the flow channel inlet of the small flow channel pipe 110 and the flow channel inlet of the large flow channel pipe 120, and the other end of the control valve rod 131 is arranged at the exhaust outlet of the third exhaust pipe 103. When the control valve is in the first working state (such as the solid line schematic structure of the control valve rod 131 in Figure 2 ), the control valve rod 131 blocks the communication between the exhaust outlet of the third exhaust pipe 103 and the flow channel inlet of the small flow channel pipe 110, and conducts the communication between the exhaust outlet of the third exhaust pipe 103 and the flow channel inlet of the large flow channel pipe 120. And when the control valve is in the second working state (such as Figure 2When the control valve stem 131 is in the dashed-line schematic structure), the control valve stem 131 conducts the exhaust outlet of the third exhaust pipe 103 and the flow path inlet of the small flow path pipe 110, and blocks the connection between the exhaust outlet of the third exhaust pipe 103 and the flow path inlet of the large flow path pipe 120. Among them, the control valve stem 131 is similar to a single-pole double-throw switch. When the control valve is in different working states, it selects to connect the exhaust outlet of the third exhaust pipe 103 with the flow path inlet of the small flow path pipe 110 or with the flow path inlet of the large flow path pipe 120.
[0049] Optionally, the control valve provided in the embodiment of the present application includes a first valve and a second valve. The first valve is arranged between the flow path inlet of the small flow path pipe and the exhaust outlet of the jth exhaust pipe, and the second valve is arranged between the flow path inlet of the large flow path pipe and the exhaust outlet of the jth exhaust pipe; in the first working state, the first valve is closed and the second valve is conducting; and in the second working state, the first valve is conducting and the second valve is closed.
[0050] Specific reference Figure 3 As shown, it is a schematic structural diagram of another exhaust manifold provided in the embodiment of the present application. Among them, the exhaust manifold is described by taking N as 6 as an example, and j is 3. The exhaust outlets of the first exhaust pipe 101 and the second exhaust pipe 102 are connected to the flow path inlet of the small flow path pipe 110, and the exhaust outlets of the fourth exhaust pipe 104, the fifth exhaust pipe 105, and the sixth exhaust pipe 106 are connected to the flow path inlet of the large flow path pipe 120. The control valve includes a first valve 132 and a second valve 133. The first valve 132 is arranged between the flow path inlet of the small flow path pipe 110 and the exhaust outlet of the third exhaust pipe 103, and the second valve 133 is arranged between the flow path inlet of the large flow path pipe 120 and the exhaust outlet of the third exhaust pipe 103. When the control valve is in the first working state, the first valve 132 is closed, so that the exhaust outlet of the third exhaust pipe 130 is cut off from the flow path inlet of the small flow path pipe 110, and the second valve 133 is conducting, so that the exhaust outlet of the third exhaust pipe 130 is connected to the flow path inlet of the large flow path pipe 120; and when the control valve is in the second working state, the first valve 132 is conducting, so that the exhaust outlet of the third exhaust pipe 130 is connected to the flow path inlet of the small flow path pipe 110, and the second valve 133 is closed, so that the exhaust outlet of the third exhaust pipe 130 is cut off from the flow path inlet of the large flow path pipe 120.
[0051] It should be noted that the control valve provided in the embodiments of the present application is not limited to the several specific structures described above. In other embodiments of the present application, it may also be of other types of structures, and the embodiments of the present application do not make specific limitations thereto. In addition, the number of exhaust pipes of the exhaust manifold provided in the embodiments of the present application is the same as the number of cylinders of the engine. For example, when the number of cylinders of the engine is an even number such as 4, 6, 8, 10, 12, 14, etc., the number of exhaust pipes of the exhaust manifold is correspondingly an even number such as 4, 6, 8, 10, 12, 14, etc., and the present application does not make specific limitations thereto.
[0052] Based on the same inventive concept, the embodiments of the present application also provide an engine. Refer to Figure 4 As shown, a schematic structural diagram of an engine provided by an embodiment of the present application, wherein the engine provided by the embodiment of the present application includes:
[0053] The first cylinder 201 to the Nth cylinder 20n, where N is an even number greater than 2. An intake manifold 300, which is connected to the intake ends of the first cylinder 201 to the Nth cylinder 20n. An exhaust manifold, which includes the first exhaust pipe 101 to the Nth exhaust pipe 10n, a small flow channel pipe 110, a large flow channel pipe 120, and a control valve 130. The control valve 130 is disposed between the exhaust outlets of the first exhaust pipe 101 to the Nth exhaust pipe 10n and the flow channel inlets of the small flow channel pipe 110 and the large flow channel pipe 120. Among them, when the control valve 130 is in the first working state, it controls the exhaust outlets of the first exhaust pipe 101 to the ith exhaust pipe (not shown) to be connected to the flow channel inlet of the small flow channel pipe, and controls the exhaust outlets of the (i + 1)th exhaust pipe (not shown) to the Nth exhaust pipe 10n to be connected to the flow channel inlet of the large flow channel pipe 120, where i is a positive integer less than N / 2; and when the control valve 130 is in the second working state, it controls the exhaust outlets of the first exhaust pipe 101 to the jth exhaust pipe (not shown) to be connected to the flow channel inlet of the small flow channel pipe, and controls the exhaust outlets of the (j + 1)th exhaust pipe (not shown) to the Nth exhaust pipe 10n to be connected to the flow channel inlet of the large flow channel pipe 120, where j is N / 2. A turbine 400, whose intake side is connected to the flow channel outlets of the small flow channel pipe 110 and the large flow channel pipe 120. And an EGR cooling system 500, which is connected between the intake manifold 300 and the small flow channel pipe 110.
[0054] In addition, the engine provided by the embodiment of the present application further includes a compressor 600 and a post-treatment system 700 connected to the turbine 400, an intercooler 800 connected to the compressor 600 and the intake manifold 300, and other component structures, which are the same as those in the prior art, so the present application will not give redundant elaboration. In addition, the EGR cooling system 500 provided by the embodiment of the present application includes an EGR cooler 510 and an EGR valve 520. The EGR cooler 510 can be connected between the EGR valve 520 and the intake manifold 300. In other embodiments of the present application, the EGR cooler can also be connected between the EGR valve and the small flow channel pipe, and the present application does not make specific limitations thereto.
[0055] It can be understood that the technical solution provided by the embodiment of the present application applies the asymmetrically designed exhaust manifold to the engine. In the first working state, the number of exhaust pipes connected to the small flow channel pipe is less than the number of exhaust pipes connected to the large flow channel pipe, so that the exhaust of the small flow channel pipe and the large flow channel pipe is balanced, the pumping loss is small, and the fuel economy of the engine is good. In the second working state, the number of exhaust pipes connected to the small flow channel pipe is the same as the number of exhaust pipes connected to the large flow channel pipe. At this time, the total exhaust volume of the small flow channel pipe and the large flow channel pipe is equal, and the intake pre-pressure of the small flow channel pipe is higher than the intake pre-pressure of the large flow channel pipe, so that the pressure difference between the pre-turbine pressure corresponding to the small flow channel pipe side and the post-intercooling pressure increases, the gas extraction capacity of the EGR cooling system increases, the EGR rate is increased, and the low-speed emission and power performance of the engine are ensured.
[0056] Specifically, when the control valve is in the first working state, the number of cylinders connected to the small flow channel pipe is less than the number of cylinders connected to the large flow channel pipe. At this time, the ratio of the small flow channel pipe flow rate to the total exhaust flow rate of the cylinders connected to the small flow channel pipe is slightly different or even the same as the ratio of the large flow channel pipe flow rate to the total exhaust flow rate of the cylinders connected to the large flow channel pipe, so that the exhaust of the small flow channel pipe and the large flow channel pipe is balanced, the pumping loss is small, and the fuel economy of the engine is good. When the control valve is in the second working state, the number of cylinders connected to the small flow channel pipe is equal to the number of cylinders connected to the large flow channel pipe. At this time, the ratio of the small flow channel pipe flow rate to the total exhaust flow rate of the cylinders connected to the small flow channel pipe is less than the ratio of the large flow channel pipe flow rate to the total exhaust flow rate of the cylinders connected to the large flow channel pipe, and the intake pre-pressure of the small flow channel pipe is higher than the intake pre-pressure of the large flow channel pipe, so that the pressure difference between the pre-turbine pressure corresponding to the small flow channel pipe side and the post-intercooling pressure increases, the gas extraction capacity of the EGR cooling system increases, the EGR rate is increased, and the low-speed emission and power performance of the engine are ensured. Thus, according to the working condition of the engine, the first working state or the second working state of the control valve is selected to finally change the operating state of the engine to improve the performance of the engine.
[0057] In an embodiment of the present application, the exhaust outlets of the first exhaust pipe to the (j - 1)th exhaust pipe provided in the embodiment of the present application are communicated with the flow channel inlet of the small flow channel pipe, and the exhaust outlets of the (j + 1)th exhaust pipe to the Nth exhaust pipe are communicated with the flow channel inlet of the large flow channel pipe; the control valve is disposed between the exhaust outlet of the jth exhaust pipe and the flow channel inlets of the small flow channel pipe and the large flow channel pipe. That is to say, when the control valve provided in the embodiment of the present application is in the first working state, the number of exhaust pipes communicated with the small flow channel pipe is one less than the number of exhaust pipes communicated with the large flow channel pipe. The control valve only needs to be disposed at the exhaust outlet of the jth exhaust pipe and the flow channel inlets of the small flow channel pipe and the large flow channel pipe, and without large-scale improvement to the exhaust manifold, the communication state between the exhaust pipe and the flow channel pipe in the first working state and the second working state of the control valve can be achieved.
[0058] Optionally, the control valve provided in the embodiment of the present application includes a control valve rod. One end of the control valve rod is disposed between the flow channel inlets of the small flow channel pipe and the large flow channel pipe, and the other end of the control valve rod is disposed at the exhaust outlet of the jth exhaust pipe; when in the first working state, the control valve rod blocks the communication between the exhaust outlet of the jth exhaust pipe and the flow channel inlet of the small flow channel pipe, and conducts the communication between the exhaust outlet of the jth exhaust pipe and the flow channel inlet of the large flow channel pipe; and when in the second working state, the control valve rod blocks the communication between the exhaust outlet of the jth exhaust pipe and the flow channel inlet of the large flow channel pipe, and conducts the communication between the exhaust outlet of the jth exhaust pipe and the flow channel inlet of the small flow channel pipe.
[0059] Specifically referring to Figure 5 As shown, it is a schematic structural diagram of another engine provided in the embodiment of the present application. Here, the exhaust manifold is described by taking N as 6 as an example, and j is 3. The exhaust outlets of the first exhaust pipe 101 and the second exhaust pipe 102 are communicated with the flow channel inlet of the small flow channel pipe 110, and the exhaust outlets of the fourth exhaust pipe 104, the fifth exhaust pipe 105 and the sixth exhaust pipe 106 are connected to the flow channel inlet of the large flow channel pipe 120. The control valve includes a control valve rod 131. One end of the control valve rod 131 is disposed between the flow channel inlets of the small flow channel pipe 110 and the large flow channel pipe 120, and the other end of the control valve rod 131 is disposed at the exhaust outlet of the third exhaust pipe 103. When the control valve is in the first working state (such as the solid line schematic structure of the control valve rod 131 in Figure 2 ), the control valve rod 131 blocks the communication between the exhaust outlet of the third exhaust pipe 103 and the flow channel inlet of the small flow channel pipe 110, and conducts the communication between the exhaust outlet of the third exhaust pipe 103 and the flow channel inlet of the large flow channel pipe 120. And when the control valve is in the second working state (such as Figure 2When the control valve rod 131 is in the dashed-line schematic structure), the control valve rod 131 conducts the exhaust outlet of the third exhaust pipe 103 and the flow path inlet of the small flow path pipe 110, and blocks the connection between the exhaust outlet of the third exhaust pipe 103 and the flow path inlet of the large flow path pipe 120. Among them, the control valve rod 131 is similar to a single-pole double-throw switch. When the control valve is in different working states, it selects to connect the exhaust outlet of the third exhaust pipe 103 and the flow path inlet of the small flow path pipe 110 or the flow path inlet of the large flow path pipe 120.
[0060] Optionally, the control valve provided in the embodiment of the present application includes a first valve and a second valve. The first valve is arranged between the flow path inlet of the small flow path pipe and the exhaust outlet of the j-th exhaust pipe, and the second valve is arranged between the flow path inlet of the large flow path pipe and the exhaust outlet of the j-th exhaust pipe; in the first working state, the first valve is closed and the second valve is conducting; and in the second working state, the first valve is conducting and the second valve is closed.
[0061] Specific reference Figure 6 As shown, it is a schematic structural diagram of another engine provided in the embodiment of the present application. Among them, the exhaust manifold is described by taking N as 6 as an example, and j is 3. The exhaust outlets of the first exhaust pipe 101 and the second exhaust pipe 102 are connected to the flow path inlet of the small flow path pipe 110, and the exhaust outlets of the fourth exhaust pipe 104, the fifth exhaust pipe 105 and the sixth exhaust pipe 106 are connected to the flow path inlet of the large flow path pipe 120. The control valve includes a first valve 132 and a second valve 133. The first valve 132 is arranged between the flow path inlet of the small flow path pipe 110 and the exhaust outlet of the third exhaust pipe 103, and the second valve 133 is arranged between the flow path inlet of the large flow path pipe 120 and the exhaust outlet of the third exhaust pipe 103. When the control valve is in the first working state, the first valve 132 is closed to cut off the connection between the exhaust outlet of the third exhaust pipe 130 and the flow path inlet of the small flow path pipe 110, and the second valve 133 is conducting to connect the exhaust outlet of the third exhaust pipe 130 and the flow path inlet of the large flow path pipe 120; and when the control valve is in the second working state, the first valve 132 is conducting to connect the exhaust outlet of the third exhaust pipe 130 and the flow path inlet of the small flow path pipe 110, and the second valve 133 is closed to cut off the connection between the exhaust outlet of the third exhaust pipe 130 and the flow path inlet of the large flow path pipe 120.
[0062] It should be noted that the control valve provided in the embodiments of the present application is not limited to the several specific structures described above. In other embodiments of the present application, it may also be of other types of structures, and the embodiments of the present application do not make specific limitations thereto. In addition, the number of exhaust pipes of the exhaust manifold provided in the embodiments of the present application is the same as the number of cylinders of the engine. For example, when the number of cylinders of the engine is an even number such as 4, 6, 8, 10, 12, 14, etc., the number of exhaust pipes of the exhaust manifold is correspondingly an even number such as 4, 6, 8, 10, 12, 14, etc., and the present application does not make specific limitations thereto.
[0063] Based on the same inventive concept, the embodiments of the present application further provide a vehicle, and the vehicle includes the engine provided in any one of the above embodiments. Among them, the vehicle provided in the embodiments of the present application includes vehicles, and the present application does not make specific limitations thereto.
[0064] The embodiments of the present application provide an exhaust manifold, an engine, and a vehicle. The exhaust manifold includes: a first exhaust pipe to an Nth exhaust pipe, where N is an even number greater than 2; a small flow channel pipe and a large flow channel pipe; and a control valve. The control valve is disposed between the exhaust outlets of the first exhaust pipe to the Nth exhaust pipe and the flow channel inlets of the small flow channel pipe and the large flow channel pipe. Among them, when the control valve is in the first working state, it controls the exhaust outlets of the first exhaust pipe to the ith exhaust pipe to communicate with the flow channel inlet of the small flow channel pipe, and controls the exhaust outlets of the (i + 1)th exhaust pipe to the Nth exhaust pipe to communicate with the flow channel inlet of the large flow channel pipe, where i is a positive integer less than N / 2; and when the control valve is in the second working state, it controls the exhaust outlets of the first exhaust pipe to the jth exhaust pipe to communicate with the flow channel inlet of the small flow channel pipe, and controls the exhaust outlets of the (j + 1)th exhaust pipe to the Nth exhaust pipe to communicate with the flow channel inlet of the large flow channel pipe, where j is N / 2.
[0065] As can be seen from the above, the technical solution provided in the embodiments of the present application applies an exhaust manifold with an asymmetric design to the engine. In the first working state, the number of exhaust pipes connected to the small flow channel pipe is less than the number of exhaust pipes connected to the large flow channel pipe, thereby making the exhaust of the small flow channel pipe and the large flow channel pipe balanced, with less pumping loss and good fuel economy of the engine; while in the second working state, the number of exhaust pipes connected to the small flow channel pipe is the same as the number of exhaust pipes connected to the large flow channel pipe. At this time, the total exhaust volume of the small flow channel pipe and the large flow channel pipe is equal, and the pre-intake pressure of the small flow channel pipe is higher than the pre-intake pressure of the large flow channel pipe, making the pressure difference between the pre-vortex pressure and the post-intercooler pressure corresponding to the small flow channel pipe side increase, increasing the air intake capacity of the EGR cooling system, improving the EGR rate, and ensuring excellent low-speed emissions and power performance of the engine.
[0066] In the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the present application.
[0067] In addition, terms such as "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.
[0068] In the present application, unless otherwise clearly specified and limited, terms such as "installed", "connected", "joined", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.
[0069] In the present application, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.
[0070] In this application, terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.
[0071] Although the embodiments of this application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting this application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.
Claims
1. An exhaust manifold, characterized in that, The exhaust manifold includes: The first exhaust pipe to the Nth exhaust pipe, where N is an even number greater than 2; A small flow channel pipe and a large flow channel pipe; And a control valve, which is arranged between the exhaust outlets of the first exhaust pipe to the Nth exhaust pipe and the flow channel inlets of the small flow channel pipe and the large flow channel pipe. Wherein, when the control valve is in the first working state, it controls the exhaust outlets of the first exhaust pipe to the ith exhaust pipe to communicate with the flow channel inlet of the small flow channel pipe, and controls the exhaust outlets of the (i + 1)th exhaust pipe to the Nth exhaust pipe to communicate with the flow channel inlet of the large flow channel pipe, and i is a positive integer less than N / 2; and when the control valve is in the second working state, it controls the exhaust outlets of the first exhaust pipe to the jth exhaust pipe to communicate with the flow channel inlet of the small flow channel pipe, and controls the exhaust outlets of the (j + 1)th exhaust pipe to the Nth exhaust pipe to communicate with the flow channel inlet of the large flow channel pipe, and j is N / 2.
2. The exhaust manifold according to claim 1, characterized in that, The exhaust outlets of the first exhaust pipe to the (j - 1)th exhaust pipe communicate with the flow channel inlet of the small flow channel pipe, and the exhaust outlets of the (j + 1)th exhaust pipe to the Nth exhaust pipe communicate with the flow channel inlet of the large flow channel pipe; The control valve is arranged between the exhaust outlet of the jth exhaust pipe and the flow channel inlets of the small flow channel pipe and the large flow channel pipe.
3. The exhaust manifold according to claim 2, wherein, The control valve includes a control valve rod, one end of the control valve rod is arranged between the flow channel inlet of the small flow channel pipe and the flow channel inlet of the large flow channel pipe, and the other end of the control valve rod is arranged at the exhaust outlet of the jth exhaust pipe; When in the first working state, the control valve rod blocks the communication between the exhaust outlet of the jth exhaust pipe and the flow channel inlet of the small flow channel pipe, and conducts the communication between the exhaust outlet of the jth exhaust pipe and the flow channel inlet of the large flow channel pipe; and when in the second working state, the control valve rod blocks the communication between the exhaust outlet of the jth exhaust pipe and the flow channel inlet of the large flow channel pipe, and conducts the communication between the exhaust outlet of the jth exhaust pipe and the flow channel inlet of the small flow channel pipe.
4. The exhaust manifold according to claim 2, characterized in that, The control valve includes a first valve and a second valve, the first valve is arranged between the flow channel inlet of the small flow channel pipe and the exhaust outlet of the jth exhaust pipe, and the second valve is arranged between the flow channel inlet of the large flow channel pipe and the exhaust outlet of the jth exhaust pipe; When in the first working state, the first valve is closed and the second valve is conducting; and when in the second working state, the first valve is conducting and the second valve is closed.
5. An engine, characterized in that, The engine includes: The first cylinder to the Nth cylinder, where N is an even number greater than 2; An intake manifold, which is communicated with the intake ends of the first cylinder to the Nth cylinder; An exhaust manifold, the exhaust manifold includes a first exhaust pipe to an Nth exhaust pipe, a small flow channel pipe, a large flow channel pipe, and a control valve. The control valve is disposed between the exhaust outlets of the first exhaust pipe to the Nth exhaust pipe and the flow channel inlets of the small flow channel pipe and the large flow channel pipe. Wherein, when the control valve is in a first working state, it controls the exhaust outlets of the first exhaust pipe to the ith exhaust pipe to communicate with the flow channel inlet of the small flow channel pipe, and controls the exhaust outlets of the (i + 1)th exhaust pipe to the Nth exhaust pipe to communicate with the flow channel inlet of the large flow channel pipe, and i is a positive integer less than N / 2; and when the control valve is in a second working state, it controls the exhaust outlets of the first exhaust pipe to the jth exhaust pipe to communicate with the flow channel inlet of the small flow channel pipe, and controls the exhaust outlets of the (j + 1)th exhaust pipe to the Nth exhaust pipe to communicate with the flow channel inlet of the large flow channel pipe, and j is N / 2; A turbine, the intake side of the turbine communicates with the flow channel outlets of the small flow channel pipe and the large flow channel pipe; And, an EGR cooling system, the EGR cooling system is connected between the intake manifold and the small flow channel pipe.
6. The engine according to claim 5, characterized in that, The exhaust outlets of the first exhaust pipe to the (j - 1)th exhaust pipe communicate with the flow channel inlet of the small flow channel pipe, and the exhaust outlets of the (j + 1)th exhaust pipe to the Nth exhaust pipe communicate with the flow channel inlet of the large flow channel pipe; The control valve is disposed between the exhaust outlet of the jth exhaust pipe and the flow channel inlets of the small flow channel pipe and the large flow channel pipe.
7. The engine according to claim 6, characterized in that, The control valve includes a control valve rod, one end of the control valve rod is disposed between the flow channel inlet of the small flow channel pipe and the flow channel inlet of the large flow channel pipe, and the other end of the control valve rod is disposed at the exhaust outlet of the jth exhaust pipe; When in the first working state, the control valve rod blocks the communication between the exhaust outlet of the jth exhaust pipe and the flow channel inlet of the small flow channel pipe, and conducts the communication between the exhaust outlet of the jth exhaust pipe and the flow channel inlet of the large flow channel pipe; and when in the second working state, the control valve rod blocks the communication between the exhaust outlet of the jth exhaust pipe and the flow channel inlet of the large flow channel pipe, and conducts the communication between the exhaust outlet of the jth exhaust pipe and the flow channel inlet of the small flow channel pipe.
8. The engine according to claim 6, characterized in that, The control valve includes a first valve and a second valve. The first valve is disposed between the flow channel inlet of the small flow channel pipe and the exhaust outlet of the jth exhaust pipe, and the second valve is disposed between the flow channel inlet of the large flow channel pipe and the exhaust outlet of the jth exhaust pipe; When in the first working state, the first valve is closed and the second valve is conducting; and when in the second working state, the first valve is conducting and the second valve is closed.
9. A vehicle, characterized in that, The vehicle includes the engine according to any one of claims 5 - 8.
10. The vehicle according to claim 9, characterized in that, The vehicle includes a vehicle.