CN113530731A

CN113530731A - Engine intake manifold and automobile

Info

Publication number: CN113530731A
Application number: CN202010310903.5A
Authority: CN
Inventors: 朱晨虹; 黄英铭; 刘强; 黄宇; 李楠; 郭迁
Original assignee: Guangzhou Automobile Group Co Ltd
Current assignee: Guangzhou Automobile Group Co Ltd
Priority date: 2020-04-20
Filing date: 2020-04-20
Publication date: 2021-10-22
Anticipated expiration: 2040-04-20

Abstract

The invention discloses an engine intake manifold, which includes an air intake air passage formed by an intake inlet, a pressure-stabilizing chamber and a plurality of air intake manifold air passages, and an EGR independent of the air intake air passage. Distribution air passages, the EGR distribution air passages are correspondingly connected with the plurality of intake manifold air passages through communication holes, and the EGR distribution air passages evenly distribute the EGR gas to the plurality of intake manifold air passages, and enter the intake manifold air passages. The EGR gas in the manifold divider is mixed with the air in it. The invention also discloses an automobile with the above-mentioned engine intake manifold. Implementing the engine intake manifold and the automobile of the present invention can adjust the uniformity of the EGR rate; the structure is compact and intensive, the layout space is saved, and the cost is reduced.

Description

Engine intake manifold and car

Technical Field

The invention relates to the field of automobile manufacturing, in particular to an engine intake manifold and an automobile.

Background

In the prior art, most of the engines are designed to guide EGR gas to a section of a header pipe behind a mounting flange of an air intake manifold throttle valve and in front of a pressure stabilizing cavity, so that the EGR gas and air are mixed and then enter the manifold pressure stabilizing cavity together to be redistributed to each cylinder air passage.

The consistency of the EGR rate (EGR air inflow/total air inflow) of the structure depends on two factors of the air intake consistency of the air passage of the manifold and whether the two gases are well mixed before entering the pressure stabilizing cavity, and the generally qualified air intake consistency of the air passage of the air manifold can be designed to be within +/-3% or even +/-1%, so that the key point of achieving better EGR rate consistency is whether the EGR gas and the air are well mixed before entering the pressure stabilizing cavity.

The traditional design is that a longer section of main pipe is designed to be connected with an inlet of an air inlet manifold and a pressure stabilizing cavity (larger than 100mm), and the problems that an EGR pipe and the air inlet manifold need to be connected and sealed through a flange, a space, an installation space, EGR and air can be uniformly mixed before entering the pressure stabilizing cavity and the like need to be solved. If the distance from the throttle flange to the pressure stabilizing cavity is too short, and the two gases do not have enough mixing space, the most EGR gas flow enters the gas passage closest to the air inlet, so that the combustion of the corresponding cylinder is worst, and the combustion consistency of each cylinder is influenced. Poor consistency, large engine vibration and other problems can be caused, and the engine can not reach ideal oil consumption and emission indexes.

In addition, the existing engine intake manifold also has the problems of large occupied space, poor mode, increased EGR pressure loss caused by longer EGR pipelines, high development cost and the like. For example: 1. the whole air inlet channel deviates to the right side, so that the total occupied width of a manifold is larger, the total width of the air inlet channel exceeds the rear end face of an engine after the air throttle, and the space above a right-side transmission is more occupied by an air inlet pipeline; 2. the farther the throttle valve is arranged away from the cylinder body, the more adverse the modal of the intake manifold is, and the manifold with the longer main pipe generally causes the throttle valve to be installed farther away from the cylinder body side, so that the modal is greatly reduced; 3. longer EGR lines result in increased EGR pressure losses. Because the EGR flange faces upwards, the EGR pipeline is wound on the manifold EGR flange at the air inlet side from the exhaust side through the rear end of the engine, the EGR pipe is a metal pipe, and the bent part of the metal pipeline is often longer due to process reasons, such as the need of reserving enough straight line sections and the like; 4. the development cost is high. During the thermodynamic development period of the engine, the part is a CNC (computer numerical control) part, and each structural wafer is processed by a wafer separator and then is glued together to form a complete part, so that the part cannot be disassembled. When the parameter needs to be adjusted during the experimental test to optimize the structure, the sample piece must be scrapped, and the optimized CNC piece is manufactured again, so that the problems of improved development cost, high time cost for optimizing and manufacturing the sample piece, high labor cost for disassembling and assembling parts and the like are caused.

Disclosure of Invention

The invention aims to solve the technical problem of providing an engine intake manifold and an automobile, which can adjust the uniformity of EGR rate; compact structure is intensive, saves the arrangement space, and reduce cost.

In order to solve the above technical problem, an embodiment of the present invention provides an engine intake manifold including: the EGR distribution air passage is correspondingly communicated with the plurality of air inlet manifold branch air passages through communication holes.

Wherein an EGR distribution airway is integrated over the plurality of intake manifold gas distribution airways, the EGR distribution airway comprising: EGR entry, the first distribution gas channel section that is linked together with EGR entry and the second distribution gas channel section that is linked together with first distribution gas channel section, wherein:

the second distribution air flue section is provided with a plurality of communicating holes with adjustable hole diameters, and the second distribution air flue section is correspondingly communicated with the plurality of air inlet manifold air flues through the communicating holes.

Wherein the EGR distribution airway further comprises: the EGR cover plate is used for forming an EGR lower plate with a first distribution air channel section and a second distribution air channel section and detachably connected to the EGR lower plate respectively.

Wherein the EGR gas passing through the EGR inlet port is uniformly differentiated into two gas flows at the first distribution passage section, and then uniformly differentiated into four gas flows at the second distribution passage section.

Wherein the air passage between the inlet of the second distribution air passage section and the outlet far away forms an obtuse-angle structure, and the air passage between the inlet of the second distribution air passage section and the outlet near away forms an acute-angle structure.

The outlet center line of the second distribution air channel section is provided with an outlet insert; the aperture size of the communicating hole is adjusted by changing the aperture size of the outlet insert.

Wherein, the inside of air intake manifold branch gas flue is equipped with the step hole that is used for assembling the export inserts.

The cross section of the pressure stabilizing cavity is narrowed from the near end connected with the air inlet to the far end connected with the air inlet.

The four branch air passages of the intake manifold are respectively wrapped on the outer surface of the pressure stabilizing cavity in a curling manner; the lengths of the four air inlet manifold branch air passages are set to be equal; the tail ends of the four air inlet manifold branch air passages are respectively provided with a sealed mounting flange.

In order to solve the technical problem, the invention also discloses an automobile.

The engine intake manifold and the automobile provided by the invention have the following beneficial effects: the engine intake manifold comprises an air intake air passage formed by an intake inlet, a pressure stabilizing cavity and a plurality of intake manifold branch air passages and an EGR distribution air passage independent of the air intake air passage, wherein the EGR distribution air passage is correspondingly communicated with the intake manifold branch air passages through communication holes, EGR gas is uniformly distributed to the intake manifold branch air passages by the EGR distribution air passage, the EGR gas entering the intake manifold branch air passages is mixed with air in the intake manifold branch air passages, and the aperture design of the communication holes can effectively adjust the uniformity of EGR rate through the design of the air passage trend. The structure of integrating the EGR distribution air passage on the air inlet manifold air passage is more compact and intensive, the arrangement space is saved, and the cost is reduced.

Drawings

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

FIG. 1 is a schematic diagram of an engine intake manifold according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of a blasting structure of an EGR distribution airway of an engine intake manifold according to an embodiment of the invention.

FIG. 3 is a schematic side view of an engine intake manifold according to an embodiment of the present invention.

FIG. 4 is a partially enlarged schematic view of an intake manifold of an engine according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-4 in combination, a first embodiment of the engine intake manifold of the present invention is shown.

The engine intake manifold in the present embodiment is applied to an automobile, and includes: an intake inlet 11 for mounting and sealing a throttle valve; a surge chamber 12 connected to the intake port 11; the air inlet 11, the pressure stabilizing cavity 12 and the air inlet manifold branch air passages 13 form an air inlet air passage 1, and air flow in the air inlet air passage 1 in the figure flows to X; and

an EGR distribution gas passage 2 independent of the air intake gas passage 1, the EGR distribution gas passage 2 being integrated on a plurality of intake manifold branch gas passages 13, the EGR distribution gas passage 2 including: an EGR inlet 22, a first distribution gas passage section 21a communicating with the EGR inlet 22, and a second distribution gas passage section 21b communicating with the first distribution gas passage section 21a, in which the flow direction of the gas flows in the first distribution gas passage section 21a and the second distribution gas passage section 21b of the EGR distribution gas passage 2 is shown as Y;

wherein: the second distribution gas passage section 21b is provided with a plurality of communication holes 241 with adjustable hole diameters, the second distribution gas passage section 21b is correspondingly communicated with a plurality of intake manifold branch gas passages 13 through the communication holes 241, the EGR distribution gas passage 2 uniformly distributes EGR gas to the plurality of intake manifold branch gas passages 13, the EGR gas entering the intake manifold branch gas passages 13 is mixed with air therein,

the engine intake manifold in the embodiment enables the EGR distribution air passage 2 to play the roles of improving the optimization efficiency and reducing the development cost during the thermodynamic development period of the engine by adjusting the size of the inner diameter of the communication hole. The air intake duct 1 introduces air that has passed through a throttle valve from an intake inlet 11 into a surge chamber 12, and then divides the air into respective intake manifold branch ducts 13 through the surge chamber 12. The EGR gas distribution passage 2 introduces the exhaust gas passing through the EGR valve into the first distribution passage section 21a and the second distribution passage section 21b from the EGR inlet 22, and then enters the intake manifold distribution passage 13 through the two distribution passage sections at the communicating hole to mix the EGR gas with the air therein, and the mixture is formed to flow to each cylinder of the engine. The reasonable air intake manifold air passage design can ensure the air intake consistency of four cylinders on the one hand and the EGR rate (EGR air inflow/total air inflow) consistency of each cylinder on the other hand by using the structure of the EGR distribution air passage 2, and the good consistency is favorable for optimizing the performances of engine emission and the like and is also favorable for the vibration reduction and noise reduction of the engine.

During specific implementation, the air inlet 11 is arranged at the side end of an air inlet manifold of the engine, the air inlet 11 is a section of straight cylindrical pipe and is short in length, and a mounting flange is designed at the air inlet 11 and is provided with a sealing ring for mounting and sealing a throttle valve. The pressure stabilizing cavity 12 is tightly connected with the air inlet 11, the pressure stabilizing cavity 12 is wrapped in the air inlet manifold branch passage 13, and the section of the pressure stabilizing cavity 12 is narrowed from the near end connected with the air inlet 11 to the far end connected with the air inlet 11. The effect of so setting is: the air taken into the intake manifold branch passage 13 is made uniform. For example: the cross section of the inlet of the cylinder air passage closest to the inlet of the pressure stabilizing cavity 12 is enlarged, and the flow guide ribs are added in the pressure stabilizing cavity, so that the air inlet difference among the four cylinders is balanced, the air inlet deviation is reduced to the minimum, and the air inlet flow consistency is controlled within +/-1%.

The number of the intake manifold branch air passages 13 in the embodiment is four, and the four branch air passages are respectively wrapped on the outer surface of the pressure stabilizing cavity 12 in a curling manner; four intake manifold branch passages 13 are arranged in a line along the surge chamber 13 and are set to be equal in length. The tail ends of the four air inlet manifold branch air passages 13 are respectively provided with a sealed mounting flange for connecting the air passages.

Furthermore, the EGR distribution air passage 2 is integrated and tightly attached to the outer surface of the air inlet manifold air passage 13, the air inlet air passage 1 and the EGR distribution air passage 2 are two independent air passages, and only the tail ends of the two air passages are communicated through a communication hole.

In particular, the EGR distribution duct 2 includes: an EGR inlet 22, a first distribution gas channel section 21a communicating with the EGR inlet 22, and a second distribution gas channel section 21b communicating with the first distribution gas channel section 21 a. Wherein: the EGR inlet 22 is flanged and fitted with a sealing ring for mounting and sealing an EGR valve or EGR line.

The first distribution gas passage section 21a and the second distribution gas passage section 21b are formed by an EGR lower plate 21 of the EGR distribution gas passage 2, the EGR lower plate 21 is an assembly structure in which a hollow chamber is provided inside, and a flow passage formed by an inner chamber thereof is the first distribution gas passage section 21a and the second distribution gas passage section 21 b.

Further, a gas inflow port of a first distribution gas passage section 21a of the cavity in the lower EGR sheet 21 is connected to the EGR inlet port 22, the first distribution gas passage section 21a has two gas outflow ports in opposite directions, two gas inflow ports of a second distribution gas passage section 21b are connected, respectively, and the second distribution gas passage section 21b has four gas outflow ports, that is, EGR gas passing through the EGR inlet port 22 is uniformly divided into two gas flows in the first distribution gas passage section 21a, and then is uniformly divided into four gas flows in the second distribution gas passage section 21 b.

Preferably, the EGR inlet 22 is provided with a connecting flange, and the structure can be used for directly mounting the EGR valve and simultaneously playing a sealing role under the condition that the arrangement of the whole machine allows, so that the use of an EGR pipeline between the EGR valve and an intake manifold is eliminated, and the cost is reduced. The connecting flange can also be used for butting against the EGR pipeline and also can play a role in sealing under the condition that the arrangement is not allowed. However, the connection structure at the EGR inlet 22 is not limited to the flange structure shown in the figure, for example, in an engine with a low EGR temperature, the EGR pipe may be connected with the intake manifold by a hose, namely, by adopting a mode of interference fit and clamping, and then the intake manifold end only needs to be designed with a cylindrical pipe joint with corresponding size.

Further, outlet inserts 24 are respectively provided on the center lines of the positions of the four gas flow outlets of the second distribution gas duct segment 21 b. Accordingly, the interior of the intake manifold branch passage 13 is provided with a stepped bore for fitting the outlet insert 24. The outlet inserts 24 are provided in four, correspondingly fitting in the stepped bores. In this embodiment, the communication holes 241 are through holes provided in the outlet insert 24, and the number of the communication holes 241 is four, and the size of the diameter of the communication holes 241 can be adjusted by changing the size of the diameter of the outlet insert 24.

By providing a stepped hole, the situation of adverse effects on the airflow due to the insecure fixation of the outlet insert 24 can be prevented. In addition, the outlet insert 24 may be glued to the stepped bore with an easily removable glue.

Preferably, the inner diameter of the outlet insert 24 is precisely modified by machining. The effect of so setting is: the removable outlet insert 24, which can modify the aperture, is the key to optimize the performance during the thermodynamic development phase of the engine, which affects the position of formation of the communication holes 241 and the flow rate of the air flow. For example: the more the center of the communication hole 241 is deviated from the center line, the more the risk of the final gas flowing to the single gas passage is, which affects the in-cylinder combustion.

Preferably, each of the communication holes 241 is provided with an openable EGR cover plate 23 corresponding to the upper end of the EGR distribution gas passage 2, the EGR cover plate 23 is mounted and sealed on the second distribution gas passage section 21b of the EGR distribution gas passage 2 by a sealing ring 231 and bolts 232, and can be repeatedly attached and detached, and the inner surface of the EGR cover plate 23 and the corresponding EGR lower piece 21 together form a distribution gas passage with a smooth inner surface. Wherein: the sealing ring 231 can ensure the tight connection between the EGR cover plate 23 and the EGR lower piece 21.

The detachable EGR cover plate 23 is arranged to: the engine intake manifold in this embodiment can use in the thermodynamics development stage, and each structure spare is usually formed through machining, forms a non-dismantled and assembled whole by sealant and nail fixed connection again, and only EGR apron 23 passes through sealing washer 231 and bolt 232 implementation structure that can nimble dismouting, makes the operation of changing export inserts 24 can accomplish through opening EGR apron 23, and then realizes the adjustable of inside air flue parameter.

It can be understood that: the structure of the first distribution gas passage section 21a and the second distribution gas passage section 21b of the EGR distribution gas passage 2 helps to distribute EGR gas evenly to four gas passages communicating with the intake manifold distribution gas passage 13, facilitating combustion uniformity of the engine.

In specific implementation, the EGR gas distribution air passage 2 starts from the EGR inlet 22, the EGR gas passing through the EGR inlet 22 is uniformly divided into two air flows in the first distribution air passage section 21a, and then is uniformly divided into four air flows in the second distribution air passage section 21B, during the process that the gas passes through the first distribution air passage section 21a to the second distribution air passage section 21B, the air passage between the inlet of the second distribution air passage section 21B and the outlet far away forms an obtuse-angle-shaped structure a, and the air passage between the inlet of the second distribution air passage section 21B and the outlet near away forms an acute-angle-shaped structure B.

When the engine intake manifold is implemented specifically, air enters a pressure stabilizing cavity 12 from an intake inlet 11 after passing through a throttle valve, and is divided into four independent intake manifold branch air passages 13 from the pressure stabilizing cavity 12. When the EGR valve is in a opened state, EGR gas passes through the EGR valve, is introduced into an EGR inlet 22 of an EGR distribution gas passage 2 through a pipeline behind the valve, is introduced into a first distribution gas passage section 21a and a second distribution gas passage section 21b, and is finally uniformly distributed to a plurality of intake manifold gas distribution passages 13, the EGR gas entering the intake manifold gas distribution passages 13 is mixed with air in the intake manifold gas distribution passages 13, and the mixed air enters a cylinder cover gas passage together to participate in a combustion process.

In the process, after the whole trend of the air passage is optimized through simulation calculation and structural arrangement, simulation and test values are prone to have some deviations. During thermodynamic development, the aperture size of the EGR distribution air passage 2 outlet insert 24 corresponding to each cylinder is adjusted through the difference of the EGR rate of each cylinder measured by tests, the consistency of the EGR rate is further optimized, the EGR cover plate 23 corresponding to a certain cylinder needing to modify the EGR outlet aperture is opened under the condition that an air inlet manifold is not detached, the previous EGR outlet insert is replaced by the latest EGR outlet insert 24, the EGR cover plate 23 is installed again, and the EGR rate is tested again to obtain the optimal parameters.

The engine intake manifold of the invention firstly can ensure the consistency of air intake of each cylinder, for example, the pressure stabilizing cavity is designed into a structure with a tapered section. Secondly, the consistency of the EGR rate (EGR air inflow/total air inflow) of each cylinder can be ensured, on one hand, the EGR distribution air passage 2 is set as an air passage distributed by branch pipes, on the premise of avoiding installation space, the design of the air passages leading to each branch air passage mutually compensates for difference, and the consistency of the EGR rate is improved; on the other hand, the inner diameter of the outlet of the EGR distribution air flue 2 can be adjusted, so that the assembled structure can be further verified to be optimal through experiments in the part performance development stage.

In other embodiments, the structure of the adjustable aperture of the communication hole 241 of the outlet insert 24 is mainly suitable for the performance test stage of the part, after determining the scheme with the best performance, the EGR cover plate 23 does not need to be made into a detachable structure, and can be directly made into an integral injection molding with the EGR lower piece 21 and then directly welded with the intake manifold air intake air passage 1 into an integral body, and the structure of the insert 25 in the EGR distribution air passage 2 can also be integrally injection molded with the EGR distribution air passage 2.

The engine intake manifold and the automobile have the following beneficial effects:

first, the mode is improved. Compare in the very long intake manifold of throttle valve rear manifold, the mounted position laminating part of its throttle valve, and be closer to the cylinder side, this helps improving the mode greatly, promotes NVH performance.

Secondly, the occupied space is small. Because the throttle valve rear main pipe is reduced, and the EGR distribution pipe is fully attached to the surface and arranged, the occupied space of the structure is small, and the engine is arranged more compactly.

Thirdly, the intake uniformity is improved. Through the shape of reasonable design pressure stabilizing cavity, cooperation inlet differentiation design and the application of the inside water conservancy diversion muscle of pressure stabilizing cavity, the homogeneity that can guarantee the air admission guarantees four jar combustion uniformity.

Fourthly, EGR gas uniformity is improved. Adjusting EGR uniformity by adjusting the directions of the EGR distribution air passage from the inlet to the first distribution air passage section 21a and the second distribution air passage section 21 b; in addition, the aperture of the EGR outlet (outlet insert) is designed to be adjustable, and an ideal optimal structure can be adjusted more accurately in a test stage.

Fifthly, the EGR pressure loss is small. The elbow that EGR entry design was faced right (with manifold plastics integrated injection moulding), because injection moulding process compares in the tubular metal resonator flexibility of bending higher, this section elbow is made plastics integrated into one piece and is helped shortening the length of this section pipeline of entrance, also makes gaseous route that gets into the distribution air flue at the entry more level and smooth simultaneously, helps reducing the pressure loss, improves the EGR rate.

And sixthly, the development efficiency is improved, and the development cost is reduced. EGR exports (export inserts) aperture adjustable, need not newly-increased sample quantity, need not to tear open air intake manifold, removes from waiting for under the condition of sample preparation cycle, can change EGR exports (export inserts) internal diameter adjustment uniformity, improves optimization efficiency, reduces the sample cost during development.

Claims

1. an engine intake manifold, is characterized in that, comprises:

The air intake air passage formed by the intake inlet, the surge chamber and a plurality of intake manifold sub-air passages and the EGR distribution air passage independent of the air intake air passage, the EGR distribution air passage passes through the communication hole Correspondingly communicates with the plurality of intake manifold branch passages.

2 . The engine intake manifold of claim 1 , wherein the EGR distribution air passage is integrated on the plurality of intake manifold air passages, and the EGR distribution air passage comprises: an EGR inlet, 2 . a first distribution air passage section in communication with the EGR inlet and a second distribution air passage section in communication with the first distribution air passage section, wherein:

The second distribution air passage section is provided with a plurality of communication holes with adjustable aperture sizes, and the second distribution air passage section communicates with the plurality of intake manifold air distribution passages correspondingly through the communication holes.

3 . The engine intake manifold of claim 2 , wherein the EGR distribution port further comprises: a port for forming the first distribution port section and the second distribution port section. 4 . An EGR lower sheet and a plurality of EGR cover plates respectively detachably connected to the EGR lower sheet.

4 . The engine intake manifold according to claim 3 , wherein the EGR gas passing through the EGR inlet is uniformly divided into two airflows in the first distribution air passage section, and then the second airflow The distribution airway segment is evenly divided into four streams.

5 . The intake manifold of an engine according to claim 4 , wherein the air passage between the inlet of the second distribution air passage section and the outlet that is far away forms an obtuse-angle structure, and the second air passage is 5 . 6 . The airway between the inlet of the distribution airway segment and the closely spaced outlet forms an acute-angled structure.

6. The engine intake manifold of claim 1, wherein an outlet insert is provided on an outlet centerline of the second distribution air passage section;

The pore size of the communication hole is adjusted by changing the pore size of the outlet insert.

7 . The engine intake manifold of claim 6 , wherein a stepped hole for assembling the outlet insert is provided in the interior of the air intake manifold. 8 .

8 . The engine intake manifold of claim 1 , wherein the cross section of the surge chamber is from a proximal end connected to the intake inlet to a distal end connected to the intake inlet. 9 . Narrow down.

9 . The engine intake manifold of claim 1 , wherein the intake manifold is provided with four air sub-channels, which are respectively curled and surrounded on the outer surface of the surge chamber; 9 .

The lengths of the four intake manifold air passages are set to be equal;

The ends of the four intake manifold air distribution passages are respectively provided with sealed mounting flanges.

10. An automobile, characterized in that the automobile comprises the engine intake manifold of any one of claims 1-9.