Exhaust gas recirculation valve, engine and vehicle

Abstract

An exhaust gas recirculation valve. The exhaust gas recirculation valve comprises a valve body (10) and a protective layer (20), wherein the valve body (10) has an exhaust gas channel (11) inside, the protective layer (20) is attached to at least part of the inner wall of the exhaust gas channel (11), and the protective layer (20) is made of a material that is resistant to reaction with acidic substances. Further disclosed are an engine and a vehicle.

Description

Exhaust gas recirculation valve, engine and vehicle

[0001] This application claims priority to Chinese Patent Application No. 202411397609.7, filed on September 30, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] The present disclosure relates to the technical field of vehicles, and in particular, to an exhaust gas recirculation valve, an engine and a vehicle. BACKGROUND

[0003] An exhaust gas recirculation (EGR) valve is a control valve installed on an engine to control the amount of exhaust gas recirculated to the intake system. The EGR valve can control the amount of exhaust gas entering the intake manifold, allowing a certain amount of exhaust gas to flow into the intake manifold for recirculation. SUMMARY

[0004] The present disclosure provides an exhaust gas recirculation (EGR) valve, an engine and a vehicle to solve or at least partially solve the problem that the EGR valve is prone to jamming, gas leakage and abnormal noise in the related art.

[0005] In a first aspect, an EGR valve is provided. The EGR valve includes a valve body and a protective layer. The valve body has an exhaust gas passage therein. The protective layer is attached to at least part of the inner wall of the exhaust gas passage, and the protective layer is made of a material that is not easily reacted with acidic substances.

[0006] In some embodiments, the exhaust gas passage includes a first sub-flow passage and a second sub-flow passage. The first sub-flow passage and the second sub-flow passage are in communication and are arranged at an angle. The protective layer provided at a position close to the second sub-flow passage of the first sub-flow passage and the protective layer provided at a position close to the first sub-flow passage of the second sub-flow passage are an integral structure.

[0007] In some embodiments, the exhaust gas passage includes a first sub-flow passage and a second sub-flow passage. The first sub-flow passage and the second sub-flow passage are in communication and are arranged at an angle. The protective layer completely covers the inner walls of the first sub-flow passage and the second sub-flow passage.

[0008] In some embodiments, the first sub-flow passage is arranged in a first direction, and the second sub-flow passage is arranged in a second direction. The second direction and the first direction have a first included angle. The first included angle is greater than or equal to 45 degrees and less than or equal to 135 degrees.

[0009] In some embodiments, the protective layer is an integral structure.

[0010] In some embodiments, the protective layer comprises at least one of a stainless steel layer, a polymer coating, or a plastic layer.

[0011] In some embodiments, the protective layer is a stainless steel layer, and an outer wall surface of the protective layer is completely fitted to an inner wall surface of the exhaust passage.

[0012] In some embodiments, the protective layer is completely fitted to the inner wall surface of the exhaust passage by a die casting process.

[0013] In some embodiments, an outer wall surface of the protective layer is provided with at least one reinforcing structure.

[0014] In some embodiments, an inner wall surface of the exhaust passage is provided with at least one cooperating structure cooperating with the at least one reinforcing structure. One of the reinforcing structure and the cooperating structure is a groove structure, and the other of the reinforcing structure and the cooperating structure is a protrusion structure.

[0015] In some embodiments, the at least one reinforcing structure comprises a plurality of reinforcing structures arranged at intervals, and the at least one cooperating structure comprises a plurality of cooperating structures arranged at intervals. The plurality of cooperating structures are respectively arranged corresponding to the plurality of reinforcing structures.

[0016] In some embodiments, a first end of the exhaust passage is provided with a first recessed groove, and the protective layer has a first protective portion embedded in the first recessed groove.

[0017] In some embodiments, the first recessed groove is opened at an air inlet end of the exhaust passage and extends to a first surface of the valve body in a direction opposite to a first direction of the exhaust passage. The first protective portion is flush with the first surface of the valve body.

[0018] In some embodiments, the EGR valve further comprises a first sealing member. In an air inlet direction of the exhaust passage, the first sealing member is arranged between the first protective portion and a groove wall of the first recessed groove.

[0019] In some embodiments, in the first direction, the first sealing member is between the first protective portion and the groove wall of the first recessed groove.

[0020] In some embodiments, a second end of the exhaust passage is provided with a second recessed groove, and the protective layer has a second protective portion embedded in the second recessed groove.

[0021] In some embodiments, the second recessed groove is opened at an air outlet end of the exhaust passage and extends to a second surface of the valve body in a second direction of the exhaust passage. The second protective portion is flush with the second surface of the valve body.

[0022] In some embodiments, the EGR valve further comprises a second seal. The second seal is disposed between the second guard and the groove wall of the second recess in the exhaust gas passage in the exhaust gas passage direction.

[0023] In some embodiments, the second seal is between the second guard and the groove wall of the second recess in the second direction.

[0024] In some embodiments, the EGR valve further comprises a valve stem and a valve plate. The valve plate is connected to a first end of the valve stem; the guard layer is provided with a valve seat, and the valve stem is disposed in the valve seat. The valve stem is configured to drive the valve plate to move to a first position abutting the valve seat to close the exhaust gas passage, and to drive the valve plate to move to a second position away from the valve seat to open the exhaust gas passage.

[0025] In some embodiments, the exhaust gas passage comprises a first sub-flow passage and a second sub-flow passage; the guard layer comprises a first sub-guard layer and a second sub-guard layer. The first sub-guard layer is attached to the inner wall of the first sub-flow passage, and the second sub-guard layer is attached to the inner wall of the second sub-flow passage. The valve seat is disposed between the second sub-guard layer and the first sub-guard layer.

[0026] In some embodiments, the valve seat is integrally formed with the guard layer.

[0027] In some embodiments, the valve seat is clamped between the second sub-guard layer and the first sub-guard layer.

[0028] In some embodiments, the valve body is provided with a guide passage, and the guide passage is communicated with the exhaust gas passage. The valve stem is slidably disposed in the guide passage to drive the valve plate to move.

[0029] In some embodiments, the guard layer further comprises a third sub-guard layer. The third sub-guard layer is connected to the side of the second sub-guard layer away from the first sub-guard layer, and the third sub-guard layer wraps at least part of the inner wall of the guide passage close to the exhaust gas passage. The EGR valve further comprises a sealing assembly, and the sealing assembly is partially disposed between the guide passage and the valve stem to seal the guide passage.

[0030] In some embodiments, the sealing assembly is partially embedded in the third sub-guard layer. The valve stem is disposed in the sealing assembly, and the inner wall of the sealing assembly abuts the valve stem.

[0031] In some embodiments, the outer wall of the sealing assembly is interference-fitted with the inner wall of the third sub-guard layer.

[0032] In some embodiments, the sealing assembly comprises a sealing seat and a flexible sealing sleeve. The sealing seat is embedded in the third sub-protection layer. The flexible sealing sleeve is embedded in the sealing seat, and an outer wall of the flexible sealing sleeve is connected to an inner wall of the sealing seat. An inner wall of the flexible sealing sleeve abuts against the valve rod.

[0033] In some embodiments, an outer wall of the sealing seat is in interference fit with an inner wall of the third sub-protection layer.

[0034] In some embodiments, the EGR valve further comprises a driving member. The driving member is disposed in the valve body and located at a side of the guide channel away from the sealing assembly. The second end of the valve rod away from the valve disc is connected to the driving member, and the driving member is configured to drive the valve rod to move.

[0035] In some embodiments, the EGR valve further comprises a temperature sensor connected to the protection layer.

[0036] In a second aspect, an engine is also provided. The engine comprises the EGR valve of the first aspect.

[0037] In a third aspect, a vehicle is also provided. The vehicle comprises the engine of the third aspect.

[0038] In some embodiments of the present disclosure, the EGR valve, the engine and the vehicle. The EGR valve comprises a valve body and a protection layer. The valve body has an exhaust passage. The protection layer is attached to at least part of the inner wall of the exhaust passage, and the protection layer is made of a material that is not easily reacted with acidic substances.

[0039] In some embodiments of the present disclosure, the valve body has an exhaust passage, and the protection layer is attached to at least part of the inner wall of the exhaust passage. The protection layer is not easily reacted with acidic substances, so as to protect the exhaust passage by the protection layer, and avoid the acidic condensate from corroding the exhaust passage, which may cause the EGR valve to be stuck, leak, make abnormal sound, etc. BRIEF DESCRIPTION OF DRAWINGS

[0040] FIG. 1 is a structural diagram of an Exhaust Gas Recirculation (EGR) valve according to some embodiments;

[0041] FIG. 2 is a sectional view along line A-A in FIG. 1;

[0042] FIG. 3 is a structural diagram of a protection layer according to some embodiments;

[0043] FIG. 4 is a sectional view of the protection layer according to some embodiments;

[0044] FIG. 5 is another structural diagram of the protection layer according to some embodiments;

[0045] Fig. 6 is another cross-sectional view of the guard layer according to some embodiments;

[0046] Fig. 7 is a structural diagram of an EGR system according to some embodiments;

[0047] Fig. 8 is a structural diagram of an engine according to some embodiments;

[0048] Fig. 9 is a structural diagram of a vehicle according to some embodiments.

[0049] Reference signs: 10: valve body; 11: exhaust passage; 111: inlet; 112: outlet; 113: first sub-flow passage; 114: second sub-flow passage; 12: first recessed groove; 13: second recessed groove; 14: first surface; 15: second surface; 20: guard layer; 21: first guard portion; 22: second guard portion; 23: valve seat; 24: first sub-guard layer; 25: second sub-guard layer; 26: third sub-guard layer; 28: reinforcing structure; 30: valve stem; 31: valve piece; 40: sealing assembly; 41: sealing seat; 42: flexible sealing sleeve; 50: guide passage;

[0050] 60: driving member; 70: temperature sensor; 80: cooler; 90: first sealing member; 100: second sealing member; 200: EGR valve; 1000: EGR system; 2000: engine; 3000: vehicle; X: first direction; Y: second direction. DETAILED DESCRIPTION

[0051] The technical solutions in the embodiments of the present disclosure will be described clearly and completely below with reference to the drawings in the embodiments of the present disclosure. However, the described embodiments are part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present disclosure.

[0052] It should be understood that the “one embodiment” or “an embodiment” mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present disclosure. Therefore, “in one embodiment” or “in an embodiment” appearing throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner.

[0053] In the related art, the valve body of an exhaust gas recirculation (EGR) valve is usually made of an aluminum alloy material. During use of the EGR valve, acidic condensed water is easily generated in the valve body of the EGR valve. The acidic condensed water is likely to corrode the valve body, causing problems such as jamming, gas leakage, and abnormal noise of the EGR valve.

[0054] To this end, some embodiments of the present disclosure provide an EGR valve.

[0055] FIG. 1 shows a structural diagram of an EGR valve in some embodiments of the present disclosure; FIG. 2 shows a sectional view of the EGR valve in FIG. 1 along line A-A; FIG. 3 shows a structural diagram of a protective layer in some embodiments of the present disclosure; FIG. 4 shows a sectional view of the protective layer in some embodiments of the present disclosure; FIG. 5 shows another structural diagram of the protective layer in some embodiments of the present disclosure; FIG. 6 shows another sectional view of the protective layer in some embodiments of the present disclosure; and FIG. 7 shows a structural diagram of an EGR system in some embodiments of the present disclosure.

[0056] As shown in FIGS. 1 to 6, the EGR valve provided by some embodiments of the present disclosure includes a valve body 10 and a protective layer 20. The valve body 10 has an exhaust passage 11. The protective layer 20 is attached to at least part of the inner wall of the exhaust passage 11, and the protective layer 20 is made of a material that is not easily reacted with acidic substances.

[0057] The EGR valve disclosed by some embodiments of the present disclosure is a control valve installed on an engine to control the amount of exhaust gas recirculated to the intake system. The EGR valve can control the amount of exhaust gas entering the intake manifold, so that a certain amount of exhaust gas flows into the intake manifold for recirculation.

[0058] The EGR valve disclosed by some embodiments of the present disclosure includes a valve body 10, which does not have corrosion resistance. For example, the valve body 10 is made of an aluminum alloy material, and the outer surface and the inner surface are covered with an oxide film. The valve body 10 is provided with an exhaust passage 11, and the exhaust passage 11 has an inlet 111 and an outlet 112. Exhaust gas can flow into the exhaust passage 11 from the inlet 111, and flow out of the outlet 112 after flowing through the exhaust passage 11.

[0059] The frequent start-stop of the hybrid engine and the large flow rate of the EGR rate exacerbate the accumulation of condensed water in the flow channel of the EGR valve, and the chlorine element produced after the combustion of the poor chlorine-containing gasoline combines with water to form a chlorine-containing acidic environment. Chloride ions have a small radius and a large electron density, and can penetrate the oxide film and react with the substrate to destroy the oxide film. The EGR valve is oxygen-deficient, and the chemical corrosion is mainly chlorine acid. Moreover, the hybrid engine and the large flow rate of the EGR valve (i.e., the boost EGR valve) exacerbate the water content of the environment, and the aluminum alloy cannot resist the corrosion environment, resulting in corrosion of the valve body of the EGR valve, causing problems such as jamming, gas leakage, and abnormal noise.

[0060] As shown in FIGS. 2-6, the EGR valve disclosed by some embodiments of the present disclosure further comprises a protective layer 20. The protective layer 20 is attached to at least part of the inner wall of the exhaust passage 11, and the protective layer 20 is made of a material that is not easily reacted with acidic substances, so as to protect the exhaust passage 11 through the protective layer 20, avoiding the acidic condensed water corroding the exhaust passage 11, and causing problems such as jamming, gas leakage, abnormal sound, etc. of the EGR valve.

[0061] The acidic substances in some embodiments of the present disclosure include exhaust gas, and condensed water after the exhaust gas is condensed, which all belong to chlorine-containing substances. Chloride ions have a small radius and a large electronic density, and can penetrate the oxide film and react with the substrate to damage the oxide film of the valve body 10. It should be noted that the protective layer 20 in some embodiments of the present disclosure has corrosion resistance, so that the acidic condensed water is not easy to corrode the protective layer 20. For example, the protective layer 20 can be a stainless steel layer, or the protective layer 20 can be a polymer coating, or the protective layer 20 can be a plastic layer. Of course, the above is only an example of the material of the protective layer 20, and is not a limitation of the present disclosure. In actual application, the material of the protective layer 20 can be selected as needed, as long as the material has corrosion resistance.

[0062] In some embodiments, when the protective layer 20 adopts a polymer coating, the polymer material can be coated on the inner wall of the exhaust passage 11 by a laser coating process to form a polymer coating as the protective layer 20.

[0063] In some embodiments, when the protective layer 20 adopts a plastic layer, the valve body 10 can be made of a plastic structure as a whole by an injection molding process, so that the protective layer 20 and the valve body 10 are integrally formed as a plastic structure. Of course, the plastic can also be coated on the inner wall of the exhaust passage 11 by laser coating to form a plastic coating as the protective layer 20.

[0064] In some embodiments, as shown in FIGS. 1 and 2, the exhaust passage 11 comprises a first sub-flow passage 113 and a second sub-flow passage 114. The second sub-flow passage 114 and the first sub-flow passage 113 are communicated and arranged at an angle. The protective layer 20 arranged at the position of the first sub-flow passage 113 close to the second sub-flow passage 114 and the protective layer 20 arranged at the position of the second sub-flow passage 114 close to the first sub-flow passage 113 are an integral structure.

[0065] As shown in FIG. 2, the exhaust passage 11 in some embodiments of the present disclosure includes at least two sub-paths arranged at an angle. For example, the exhaust passage 11 includes a first sub-path 113 arranged along a first direction X and a second sub-path 114 arranged along a second direction Y.

[0066] The first direction X is the axial direction of the valve stem 30. It can be understood that the first direction X is the moving direction of the valve stem 30. The second direction Y is the flow direction of the gas in the second sub-path 114.

[0067] In some embodiments of the present disclosure, by arranging the exhaust passage 11 as at least two sub-paths arranged at an angle, the condensed water generated during the exhaust gas circulation can be naturally converged, and the condensed water can be prevented from remaining in the valve body 10.

[0068] At the bending position of the exhaust passage 11, the exhaust gas flow rate is low, so that the inner wall of the bending position of the exhaust passage 11 is in contact with the exhaust gas for a longer time. In addition, after the exhaust gas is condensed, the waste water is also easy to accumulate at the bending position of the exhaust passage 11, which causes the bending position to be more prone to corrosion. Therefore, in some embodiments of the present disclosure, the protective layer 20 arranged at the position close to the second sub-path 114 of the first sub-path 113 and the protective layer 20 arranged at the position close to the first sub-path 113 of the second sub-path 114 are arranged as an integrated structure, so that the protective layer 20 can effectively prevent the exhaust gas and the waste water from contacting the valve body 10, thereby preventing the exhaust gas and the waste water from contacting the inner wall of the exhaust passage 11.

[0069] In some embodiments of the present disclosure, the bent exhaust passage 11 can enable the EGR valve of some embodiments of the present disclosure to be used as a poppet valve. Compared with the embodiment using a butterfly valve as an EGR valve, the poppet valve can be suitable for large flow of exhaust gas, which is more conducive to recycling the energy of the exhaust gas and improving the thermal efficiency of the engine.

[0070] It should be noted that it is difficult to arrange the protective layer 20 in the bent exhaust passage 11, and the protective layer 20 is difficult to completely cover the exhaust passage 11. Therefore, in some embodiments of the present disclosure, the protective layer 20 is arranged at least at the bending position of the exhaust passage 11, which can prevent corrosion from occurring at the position with high risk of corrosion of the exhaust gas, thereby reducing the risk of jamming, gas leakage, and abnormal noise of the EGR valve.

[0071] In some embodiments, the protective layer 20 can completely cover the inner walls of the first sub-path 113 and the second sub-path 114.

[0072] By completely coating the inner walls of the first sub-flow passage 113 and the second sub-flow passage 114 with the protective layer 20, the exhaust gas can be completely isolated, so that the acidic condensed water can be completely prevented from corroding the exhaust passage 11, thereby avoiding problems such as jamming, gas leakage, and abnormal noise of the EGR valve. Here, "completely coating" can be understood as the protective layer 20 covering all the inner walls of the first sub-flow passage 113 and the second sub-flow passage 114.

[0073] In some embodiments, the protective layer 20 is an integral structure. That is, the protective layer 20 includes at least two sub-protective layers, each of which is attached to the inner wall of a sub-flow passage, and the at least two sub-protective layers are integrally formed.

[0074] By designing the protective layer 20 in an integral forming manner, the reliability of the protective layer 20 can be further improved, so that the protective layer 20 can more reliably protect the exhaust passage 11 of the valve body 10.

[0075] In some embodiments, the protective layer 20 includes at least one of a stainless steel layer, a high polymer coating layer, or a plastic layer.

[0076] In some embodiments of the present disclosure, the protective layer 20 can be a stainless steel layer. For example, the protective layer 20 can be a 316L stainless steel layer. Alternatively, the protective layer 20 can also be a high polymer coating layer, for example, a polytetrafluoroethylene layer. Alternatively, the protective layer 20 can also be a plastic layer, for example, a polypropylene layer.

[0077] By setting the protective layer 20 as at least one of a stainless steel layer, a high polymer layer, or a plastic layer, each sub-flow passage can be protected by the stainless steel layer, the high polymer layer, or the plastic layer, so as to avoid problems such as jamming, gas leakage, and abnormal noise of the EGR valve caused by the corrosion of the acidic condensed water to each sub-flow passage.

[0078] In some embodiments, when the protective layer 20 is a stainless steel layer, the valve body 10 and the protective layer 20 can be formed into an integral piece by a die casting process, and the outer wall surface of the protective layer 20 is completely attached to the inner wall surface of the exhaust passage 11.

[0079] When the protective layer 20 is a stainless steel layer, the valve body 10 and the protective layer 20 are formed into an integral piece by a die casting process. After the die casting is completed, the outer wall surface of the protective layer 20 can be completely attached to the inner wall surface of the exhaust passage 11, thereby preventing the protective layer 20 from falling off and ensuring the corrosion resistance of the protective layer 20. Here, "completely attached" can be understood as the outer wall surface of the protective layer 20 being attached to all the inner wall surfaces of the exhaust passage 11, and covering all the inner wall surfaces of the exhaust passage 11.

[0080] In some embodiments of the present disclosure, the complete adhesion can refer to no gap recognizable by naked eyes between the two, and the binding force between the two is large, and one of them cannot be removed without damaging the other, and it cannot be restored after being removed. The complete adhesion in some embodiments of the present disclosure can be realized by a die casting process, a laser coating process, etc. The conventional processes such as bonding and pressing cannot realize the complete adhesion. For the bonding and pressing, the gap between the two can be observed by naked eyes, and one of them cannot be removed without damaging the other, and it cannot be restored after being removed.

[0081] In some embodiments of the present disclosure, the outer wall surface of the protective layer 20 is completely adhered to the inner wall surface of the exhaust gas passage 11, which can avoid the exhaust gas from contacting the inner wall surface of the exhaust gas passage 11 through the gap between the protective layer 20 and the inner wall surface of the exhaust gas passage 11, and further improve the corrosion resistance of the protective layer 20.

[0082] It should be noted that the outer wall surface of the protective layer 20 refers to the wall surface in contact with the inner wall surface of the exhaust gas passage 11, and the inner wall surface of the protective layer 20 encloses a passage for the exhaust gas to pass through.

[0083] In addition, in some embodiments of the present disclosure, by setting the protective layer 20 as a stainless steel layer, the production cost of the EGR valve can be reduced, and the protection effect can be improved.

[0084] In some examples, the die casting process is as follows: first, the protective layer 20 is made, then the protective layer 20 is placed in the mold of the valve body 10, and finally the molten liquid is quickly pressed into the mold of the valve body 10 and the mold is closed, and after the molten liquid is cooled and solidified, the valve body 10 and the protective layer 20 are formed into an integral part by the die casting process.

[0085] It should be noted that the protective layer 20 can be a 316L stainless steel layer, of course, the protective layer 20 can also be a 321 stainless steel. The above is only an example of stainless steel material, and is not a limitation of the present disclosure. The present disclosure does not limit the type of stainless steel, and any type of stainless steel material can be used.

[0086] In some embodiments, as shown in FIG. 5, the outer wall of the protective layer 20 is provided with a reinforcing structure 28.

[0087] By providing the reinforcing structure 28 on the outer wall of the protective layer 20, the strength of the protective layer 20 can be enhanced by the reinforcing structure 28. In this way, in the process of forming the protective layer 20 and the valve body 10 into an integral part by the die casting process, the protective layer 20 can withstand the pressure generated by the high-pressure molten liquid on the protective layer 20 when being pressed in and cooled in the die casting process.

[0088] In some examples, the inner wall surface of the exhaust passage 11 is provided with a matching structure that matches the reinforcing structure 28. One of the reinforcing structure 28 and the matching structure is a groove structure, and the other of the reinforcing structure 28 and the matching structure is a protrusion structure.

[0089] By providing the matching structure on the inner wall surface of the exhaust passage 11 and corresponding to the reinforcing structure 28, the matching structure can provide a space for the reinforcing structure 28 to avoid. Here, the matching structure on the inner wall surface of the exhaust passage 11 can be formed after the molten liquid is cooled, and the reinforcing structure 28 can be formed during the separate production of the protective layer 20.

[0090] For example, the reinforcing structure 28 can be a protrusion structure, and the matching structure can be a groove structure. The groove structure is correspondingly arranged with the protrusion structure to provide a space for the protrusion structure to avoid. The protrusion structure can be a rib, a reinforcing rib, an arc-shaped protrusion, etc., and the matching structure is matched with the shape of the protrusion structure.

[0091] Of course, the reinforcing structure 28 in some embodiments of the present disclosure can also be a groove structure, and the matching structure can be a protrusion structure. The present disclosure does not limit the structure type of the reinforcing structure 28 and the matching structure. In actual application, it can be set as needed.

[0092] In some embodiments, the outer wall of the protective layer 20 can be provided with a plurality of reinforcing structures 28 arranged at intervals, and the inner wall surface of the exhaust passage 11 can be provided with a plurality of matching structures arranged at intervals. Each matching structure is correspondingly arranged with a reinforcing structure 28.

[0093] By setting the reinforcing structure 28 and the matching structure as a plurality, and each matching structure is correspondingly arranged with a reinforcing structure 28, the strength of the protective layer 20 can be further increased, so that the protective layer 20 can withstand the pressure of the die casting process.

[0094] In some embodiments, as shown in FIG. 2, the first end of the exhaust passage 11 is provided with a first recessed groove 12, and the protective layer 20 has a first protective part 21 embedded in the first recessed groove 12.

[0095] The first end of the exhaust passage 11 can be an air inlet end or an air outlet end. Hereinafter, taking the first end of the exhaust passage 11 as the air inlet end and the second end of the exhaust passage 11 as the air outlet end as an example, the relevant description will be carried out.

[0096] Since the air inlet end of the exhaust passage 11 is opened on the valve body 10, the valve body 10 is connected with the exhaust system through the flange, so when the exhaust gas enters the exhaust passage 11 through the air inlet end, there is a risk that the exhaust gas will leak through the gap between the flange surfaces and cause the valve body 10 to be corroded by contacting the exhaust gas.

[0097] In some embodiments of the present disclosure, the first recessed groove 12 is arranged at the first end of the exhaust passage 11, and the first protection part 21 of the protection layer 20 is embedded in the first recessed groove 12. The first protection part 21 can protect the first end of the exhaust passage 11, prevent the acidic gas or liquid from contacting the first end of the exhaust passage 11, and corrode the valve body 10, so as to avoid the leakage of the EGR valve.

[0098] It should be noted that the first protection part 21 in some embodiments of the present disclosure can be an annular flange structure, and the first protection part 21 is attached to one end of the protection layer 20. For example, as shown in FIG. 2, the first recessed groove 12 is arranged at the inlet end of the exhaust passage 11, and extends to the first surface 14 of the valve body 10 in the opposite direction of the first direction X of the exhaust passage 11. The first protection part 21 is flush with the first surface 14 of the valve body 10.

[0099] By arranging the first recessed groove 12 at the inlet end of the exhaust passage 11, and extending the first recessed groove 12 to the first surface 14 of the valve body 10 in the opposite direction of the first direction X of the exhaust passage 11, the first protection part 21 can be embedded in the first recessed groove 12, and the first protection part 21 can be flush with the first surface 14 of the valve body 10. In this way, the arrangement of the first protection part 21 and the first recessed groove 12 will not affect the assembly of the valve body 10.

[0100] It should be noted that the first direction X in some embodiments of the present disclosure is the inlet direction of the exhaust passage 11, and the second direction Y is the outlet direction of the exhaust passage 11.

[0101] In some embodiments, as shown in FIG. 2, the EGR valve further comprises a first sealing member 90. In the inlet direction of the exhaust passage 11, the first sealing member 90 is arranged between the first protection part 21 and the groove wall of the first recessed groove 12.

[0102] By arranging the first sealing member 90 between the first protection part 21 and the groove wall of the first recessed groove 12 in the inlet direction of the exhaust passage 11, the first sealing member 90 can seal the gap between the first protection part 21 and the groove wall of the first recessed groove 12.

[0103] In some embodiments, in the first direction X, the first sealing member 90 is between the first protection part 21 and the groove wall of the first recessed groove 12.

[0104] By arranging the first sealing member 90 between the first protection part 21 and the groove wall of the first recessed groove 12 in the first direction X, the first sealing member 90 can be covered by the first protection part 21, so as to protect the first sealing member 90 by the first protection part 21, and avoid the corrosion of the first sealing member 90 by contacting the acidic gas or liquid.

[0105] It should be noted that the first seal 90 in some embodiments of the present disclosure can be a rigid seal or a flexible seal. The present disclosure does not limit the type of the first seal 90. In actual applications, it can be selected as needed.

[0106] In some embodiments, as shown in FIG. 2, the second end of the exhaust passage 11 is provided with a second recessed groove 13, and the protective layer 20 has a second protective portion 22 embedded in the second recessed groove 13.

[0107] Similarly, since the valve body 10 is connected to the intake system through the flange surface, there is also a gap between the flange surfaces at the gas outlet end of the exhaust passage 11, which may leak exhaust gas and cause the risk of corrosion of the valve body 10.

[0108] In some embodiments of the present disclosure, by providing the second recessed groove 13 at the second end of the exhaust passage 11 and embedding the second protective portion 22 of the protective layer 20 in the second recessed groove 13, the second end of the exhaust passage 11 can be protected by the second protective portion 22 to prevent acidic gas or liquid from contacting the second end of the exhaust passage 11, causing corrosion of the valve body 10 and leading to leakage of the EGR valve.

[0109] It should be noted that the second protective portion 22 in some embodiments of the present disclosure can be an annular flange structure, and the second protective portion 22 is attached to the other end of the protective layer 20.

[0110] In some embodiments, the second recessed groove 13 is opened at the gas outlet end of the exhaust passage 11 and extends along the second direction Y of the exhaust passage 11 to the second surface 15 of the valve body 10. The second protective portion 22 is flush with the second surface 15 of the valve body 10.

[0111] By opening the second recessed groove 13 at the gas outlet end of the exhaust passage 11 and extending the second recessed groove 13 along the second direction Y of the exhaust passage 11 to the second surface 15 of the valve body 10, the second protective portion 22 can be embedded in the second recessed groove 13, and the second protective portion 22 can be flush with the second surface 15 of the valve body 10. In this way, through the above arrangement, the arrangement of the second protective portion 22 and the second recessed groove 13 will not affect the assembly of the valve body 10.

[0112] In some embodiments, as shown in FIG. 2, the EGR valve further comprises a second seal 100. Along the gas outlet direction of the exhaust passage 11, the second seal 100 is arranged between the second protective portion 22 and the groove wall of the second recessed groove 13.

[0113] By arranging the second seal 100 between the second protective portion 22 and the groove wall of the second recessed groove 13 along the gas outlet direction of the exhaust passage 11, the gap between the second protective portion 22 and the groove wall of the second recessed groove 13 can be sealed by the second seal 100.

[0114] In some embodiments, in the second direction Y, the second seal 100 is between the second guard portion 22 and the groove wall of the second recessed groove 13.

[0115] By arranging the second seal 100 between the second guard portion 22 and the groove wall of the second recessed groove 13 in the second direction Y, the second seal 100 can be covered by the second guard portion 22 to protect the second seal 100 from being corroded by the acidic gas or liquid.

[0116] It should be noted that the second seal 100 in some embodiments of the present disclosure can be a rigid seal or a flexible seal. The present disclosure does not limit the type of the second seal 100. In actual applications, it can be selected as needed.

[0117] In some embodiments, as shown in FIGS. 2-6, the EGR valve further includes a valve stem 30 and a valve plate 31. The valve plate 31 is connected to the first end of the valve stem 30. The protective layer 20 is provided with a valve seat 23, and the valve stem 30 is arranged in the valve seat 23. The valve stem 30 is configured to drive the valve plate 31 to move to a first position abutting the valve seat 23 to close the exhaust gas passage 11, and drive the valve plate 31 to move to a second position away from the valve seat 23 to open the exhaust gas passage 11.

[0118] As shown in FIGS. 2-6, some embodiments of the present disclosure disclose that the protective layer 20 is provided with a valve seat 23, the valve stem 30 is arranged in the valve seat 23, and the valve plate 31 is connected to the first end of the valve stem 30. The valve stem 30 can move in the valve seat 23 to drive the valve plate 31 to move, so that the valve plate 31 can move to a first position abutting the valve seat 23 to close the exhaust gas passage 11. Alternatively, the valve stem 30 can move in the valve seat 23 to drive the valve plate 31 to move, so that the valve plate 31 can move to a second position away from the valve seat 23 to open the exhaust gas passage 11.

[0119] In some embodiments of the present disclosure, the valve seat 23 is arranged on the protective layer 20. When the valve plate 31 abuts the valve seat 23, the exhaust gas passage 11 is closed. After the exhaust gas passage 11 is closed, the exhaust gas passage 11 is blocked, and the exhaust gas cannot pass through. When the valve plate 31 is separated from the valve seat 23, the exhaust gas passage 11 is opened. After the exhaust gas passage 11 is opened, the exhaust gas can pass through the exhaust gas passage 11. By arranging the valve seat 23 on the protective layer 20, the structural stability of the EGR valve can be improved, and the production cost of the EGR valve can be reduced.

[0120] It should be noted that the connection of the valve plate 31 to the first end of the valve stem 30 in some embodiments of the present disclosure is not limited to the connection of the valve plate 31 to the end of the valve stem 30, but can also be the connection of the valve plate 31 to a position close to the end of the valve stem 30.

[0121] In some embodiments, as shown in FIGS. 2-6, the exhaust passage 11 includes a first sub-passage 113 and a second sub-passage 114; the protective layer 20 includes a first sub-protective layer 24 and a second sub-protective layer 25. The first sub-protective layer 24 is attached to the inner wall of the first sub-passage 113, and the second sub-protective layer 25 is attached to the inner wall of the second sub-passage 114. The valve seat 23 is arranged between the second sub-protective layer 25 and the first sub-protective layer 24.

[0122] As shown in FIGS. 2-6, the exhaust passage 11 includes the first sub-passage 113 and the second sub-passage 114 arranged in sequence. The first sub-passage 113 is connected to the air inlet 111, and the exhaust gas can enter the first sub-passage 113 from the air inlet 111. The second sub-passage 114 is connected to the first sub-passage 113, and the second sub-passage 114 is connected to the air outlet 112. The exhaust gas enters the first sub-passage 113 from the air inlet 111, and flows out of the air outlet 112 after flowing through the first sub-passage 113 and the second sub-passage 114.

[0123] As shown in FIGS. 2-6, the protective layer 20 disclosed in some embodiments of the present disclosure includes the first sub-protective layer 24 and the second sub-protective layer 25. The first sub-protective layer 24 is attached to the inner wall of the first sub-passage 113, and the second sub-protective layer 25 is attached to the inner wall of the second sub-passage 114, so that the inner walls of the first sub-passage 113 and the second sub-passage 114 can be protected by the first sub-protective layer 24 and the second sub-protective layer 25, respectively.

[0124] It should be noted that the valve seat 23 in some embodiments of the present disclosure is arranged between the second sub-protective layer 25 and the first sub-protective layer 24, the valve rod 30 is arranged in the valve seat 23, and the valve piece 31 is connected to the end of the valve rod 30 close to the first sub-protective layer 24. The valve rod 30 is movable. The valve rod 30 can drive the valve piece 31 to move to a first position abutting against the valve seat 23 to close the exhaust passage 11, or the valve rod 30 can drive the valve piece 31 to move to a second position away from the valve seat 23 to open the exhaust passage 11.

[0125] In some embodiments, the valve seat 23 can be integrally formed with the protective layer 20. That is, the valve seat 23 is arranged between the first sub-protective layer 24 and the second sub-protective layer 25, and the valve seat 23 is integrally formed with the first sub-protective layer 24 and the second sub-protective layer 25. Integrally forming the valve seat 23 with the protective layer 20 helps to improve the sealing performance of the protective layer 20.

[0126] In some embodiments, a first clamping portion can be arranged on the valve seat 23, a second clamping portion can be arranged between the first sub-protection layer 24 and the second sub-protection layer 25 of the protection layer 20, and the first clamping portion is clamped to the second clamping portion, so as to connect the valve seat 23 between the second sub-protection layer 25 and the first sub-protection layer 24. By clamping the valve seat 23 between the second sub-protection layer 25 and the first sub-protection layer 24, the processing of the protection layer 20 and the valve seat 23 is facilitated.

[0127] For example, a protrusion can be arranged on the valve seat 23, a groove can be arranged between the first sub-protection layer 24 and the second sub-protection layer 25, and the protrusion is clamped in the groove, so as to clamp the valve seat 23 between the second sub-protection layer 25 and the first sub-protection layer 24. Of course, the present disclosure does not limit the structure of the first clamping portion and the second clamping portion, and in actual application, the first clamping portion and the second clamping portion can be arranged as needed.

[0128] In some embodiments, as shown in FIG. 2, the EGR valve further comprises a guide channel 50. The guide channel 50 is communicated with the exhaust gas channel 11, and the valve rod 30 is slidably arranged in the guide channel 50 to drive the valve plate 31 to move.

[0129] In some embodiments of the present disclosure, the guide channel 50 is arranged in the valve body 10, the guide channel 50 is communicated with the exhaust gas channel 11, the valve rod 30 is slidably arranged in the guide channel 50, the valve rod 30 can be limited by the guide channel 50, the valve rod 30 can slide in a predetermined direction, so as to drive the valve plate 31 to move, the valve plate 31 can reach a first position abutting against the valve seat 23 to open the exhaust gas channel 11, or the valve plate 31 can reach a second position away from the valve seat 23 to close the exhaust gas channel 11.

[0130] In some embodiments, as shown in FIG. 2, the protection layer 20 further comprises a third sub-protection layer 26. The third sub-protection layer 26 is connected to the side of the second sub-protection layer 25 away from the first sub-protection layer 24, and the third sub-protection layer 26 wraps at least part of the inner wall of the guide channel 50 close to the exhaust gas channel 11. The EGR valve further comprises a sealing assembly 40, and the sealing assembly 40 is partially arranged between the guide channel 50 and the valve rod 30 to seal the guide channel 50.

[0131] The protection layer 20 in some embodiments of the present disclosure further comprises a third sub-protection layer 26, the third sub-protection layer 26 is connected to the side of the second sub-protection layer 25 away from the first sub-protection layer 24, and the third sub-protection layer 26 wraps at least part of the inner wall of the guide channel 50 close to the exhaust gas channel 11. In this way, the inner wall of the exhaust gas channel 11 and at least part of the inner wall of the guide channel 50 can be protected by the third sub-protection layer 26, so as to prevent the acidic gas or liquid from contacting the exhaust gas channel 11 and corroding the valve body 10, thereby preventing the EGR valve from leaking and other problems.

[0132] Further, by arranging the sealing assembly 40 between the guide channel 50 and the valve rod 30, the guide channel 50 can be sealed by the sealing assembly 40, so as to avoid the exhaust gas flowing out of the exhaust gas channel 11 and corroding other parts of the valve body 10.

[0133] In some embodiments, the sealing assembly 40 is at least partially embedded in the third sub-protection layer 26. The valve rod 30 is arranged in the sealing assembly 40, and the inner wall of the sealing assembly 40 abuts against the valve rod 30.

[0134] As shown in FIG. 2, by at least partially embedding the sealing assembly 40 in the third sub-protection layer 26 and making the outer wall of the sealing assembly 40 interference fit with the inner wall of the third sub-protection layer 26, the reliability of the connection between the sealing assembly 40 and the third sub-protection layer 26 can be ensured.

[0135] Further, by arranging the valve rod 30 in the sealing assembly 40 and making the inner wall of the sealing assembly 40 abut against the valve rod 30, the gap between the third sub-protection layer 26 and the valve rod 30 can be sealed by the sealing assembly 40, so as to avoid the exhaust gas flowing out of the gap between the third sub-protection layer 26 and the valve rod 30 and corroding the valve body 10.

[0136] In some embodiments, as shown in FIG. 2, the sealing assembly 40 includes a sealing seat 41 and a flexible sealing sleeve 42. The sealing seat 41 is embedded in the third sub-protection layer 26, and the flexible sealing sleeve 42 is embedded in the sealing seat 41. Further, the outer wall of the flexible sealing sleeve 42 is connected to the inner wall of the sealing seat 41, and the inner wall of the flexible sealing sleeve 42 abuts against the valve rod 30.

[0137] As shown in FIG. 2, the sealing assembly 40 disclosed in some embodiments of the present disclosure includes a sealing seat 41 and a flexible sealing sleeve 42, and the sealing seat 41 is embedded in the third sub-protection layer 26. For example, the outer wall of the sealing seat 41 can interference fit with the inner wall of the third sub-protection layer 26, so as to ensure the reliability of the connection between the sealing seat 41 and the third sub-protection layer 26.

[0138] For another example, the outer wall of the sealing seat 41 can be attached to the inner wall of the third sub-protection layer 26, so as to ensure the sealing between the sealing seat 41 and the third sub-protection layer 26 and avoid the exhaust gas flowing out of the gap between the sealing seat 41 and the third sub-protection layer 26.

[0139] Of course, the above examples of the connection between the outer wall of the sealing seat 41 and the inner wall of the third sub-protection layer 26 are only individual embodiments of the present disclosure, and are not intended to limit the present disclosure. In actual applications, the connection between the sealing seat 41 and the third sub-protection layer 26 can be arranged as needed.

[0140] In some embodiments of the present disclosure, the flexible sealing sleeve 42 is embedded in the sealing seat 41, and the outer wall of the flexible sealing sleeve 42 is connected to the inner wall of the sealing seat 41, the valve rod 30 is arranged in the flexible sealing sleeve 42, and the inner wall of the flexible sealing sleeve 42 abuts against the valve rod 30. In this way, the gap between the sealing seat 41 and the valve rod 30 can be sealed by the flexible sealing sleeve 42, so that the exhaust gas cannot flow out from the gap between the sealing seat 41 and the valve rod 30.

[0141] In some embodiments, the EGR valve can also not be provided with the guide channel 50 and the third sub-protection layer 26. The exhaust gas channel 11 only includes the first sub-flow channel 113 and the second sub-flow channel 114. The protection layer 20 only includes the first sub-protection layer 24 and the second sub-protection layer 25. The sealing assembly 40 is partially embedded in the second sub-protection layer 25, and the outer wall of the sealing assembly 40 is in interference fit or small gap fit with the inner wall of the second sub-protection layer 25. The valve rod 30 extends along the first direction X and is arranged in the sealing assembly 40, and the valve rod 30 abuts against the inner wall of the sealing assembly 40. In this way, the gap between the valve rod 30 and the second sub-protection layer 25 can be sealed by the sealing assembly 40, so that the exhaust gas cannot flow out from the gap between the valve rod 30 and the second sub-protection layer 25.

[0142] The sealing assembly 40 in this embodiment can be the same as or different from the sealing assembly 40 in the above-mentioned embodiments. The present disclosure does not limit the structure of the sealing assembly 40. In actual applications, it can be set as needed.

[0143] In some embodiments, as shown in FIG. 2, the EGR valve further includes a driving member 60. The driving member 60 is arranged in the valve body 10 and located on the side of the guide channel 50 away from the sealing assembly 40. The second end of the valve rod 30 away from the valve plate 31 is connected to the driving member 60, and the driving member 60 is configured to drive the valve rod 30 to move.

[0144] As shown in FIG. 2, in some embodiments of the present disclosure, the driving member 60 is arranged in the valve body 10 and located on the side of the guide channel 50 away from the sealing assembly 40. The second end of the valve rod 30 away from the valve plate 31 is connected to the driving member 60, so that the valve rod 30 can be driven to move by the driving member 60.

[0145] It should be noted that the driving member 60 in some embodiments of the present disclosure can be a hydraulic driving member, or the driving member 60 can be a pneumatic driving member, or the driving member 60 can also be an electromagnetic driving member. The present disclosure does not limit the structure of the driving member 60. In actual applications, it can be selected as needed.

[0146] In some embodiments, as shown in FIG. 2, the first sub-flow passage 113 is arranged along a first direction X, and the second sub-flow passage 114 is arranged along a second direction Y. The second direction Y has a first included angle θ with the first direction X, and the first included angle θ is greater than or equal to 45 degrees and less than or equal to 135 degrees.

[0147] As shown in FIG. 2, in some embodiments of the present disclosure, the second direction Y has a first included angle θ with the first direction X, and the first included angle θ is greater than or equal to 45 degrees and less than or equal to 135 degrees. In this way, the condensed water generated during the exhaust gas circulation process can be naturally returned.

[0148] For example, the first included angle θ can be 45 degrees, 55 degrees, 65 degrees, 75 degrees, 85 degrees, 95 degrees, 105 degrees, 115 degrees, 125 degrees, or 135 degrees, etc.

[0149] In some embodiments, as shown in FIGS. 1-6, the EGR valve further comprises a temperature sensor 70 connected to the protective layer 20.

[0150] By connecting the temperature sensor 70 to the protective layer 20, the temperature of the exhaust gas entering the protective layer 20 can be measured by the temperature sensor 70, and the opening and closing of the EGR valve can be controlled based on the temperature of the exhaust gas and other factors.

[0151] For example, a through hole can be provided on the peripheral wall of the first sub-protective layer 24, and the temperature sensor 70 can be embedded in the through hole to connect the temperature sensor 70 to the first sub-protective layer 24. Of course, the above is only an individual example of the way in which the temperature sensor 70 is connected to the first sub-protective layer 24, and is not a limitation of the present disclosure. In actual applications, the way in which the temperature sensor 70 is connected to the first sub-protective layer 24 can also be set as needed.

[0152] As shown in FIG. 7, some embodiments of the present disclosure also provide an EGR system 1000 comprising the above-mentioned EGR valve.

[0153] It should be noted that the EGR valve included in the EGR system has the same structure as the EGR valve described in the above embodiments, and has similar benefits. Herein, further description is omitted.

[0154] In some embodiments, as shown in FIG. 7, the EGR system further comprises a cooler 80 connected to the EGR valve.

[0155] As shown in FIG. 7, the EGR valve further comprises a cooler 80 for cooling the exhaust gas. The EGR valve is connected to the cooler 80 to control the amount of exhaust gas entering the intake manifold through the EGR valve, so that the amount of exhaust gas entering the intake manifold is more appropriate.

[0156] Some embodiments of the present disclosure further provide an engine 2000. As shown in FIG. 8, the engine 2000 comprises the EGR system 1000 described above.

[0157] It should be noted that the engine 2000 comprises the EGR system 1000 and the structure of the EGR system described above is the same, and the beneficial effects are similar. Here, no longer described.

[0158] Some embodiments of the present disclosure further provide a vehicle 3000. As shown in FIG. 9, the vehicle 3000 comprises the engine 2000 described in the above embodiments.

[0159] It should be noted that the vehicle 3000 comprises the engine 2000 and the structure of the engine described above is the same, and the beneficial effects are similar. Here, no longer described.

[0160] It should be noted that each of the embodiments in the present specification is described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same and similar parts of each embodiment can be referred to each other.

[0161] Although the alternative embodiments of the present disclosure have been described, those skilled in the art can make further changes and modifications to the embodiments once they know the basic inventive concept. Therefore, the appended claims are intended to cover all alternative embodiments and all changes and modifications falling within the scope of the present disclosure.

[0162] Finally, it should be noted that in this document, the relationship terms such as first and second are only used to distinguish one entity from another entity, and do not necessarily require or imply that there is any such actual relationship or order between the entities. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the article or terminal device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such article or terminal device. Without more limitations, the element defined by the statement "including a" does not exclude the presence of another identical element in the article or terminal device including the element.

[0163] The above describes the technical solutions provided by the present disclosure in detail. The principles and implementation manners of the present disclosure are described by specific examples in this document. For those skilled in the art, according to the principles and implementation manners of the present disclosure, the specific implementation manners and application scope will be changed. In summary, the content of the present specification should not be understood as a limitation of the present disclosure.

Claims

1. An Exhaust Gas Recirculation (EGR) valve, comprising: a valve body (10) having an exhaust passage (11) therein; and a protective layer (20) attached to at least part of the inner wall of the exhaust passage (11), the protective layer (20) being made of a material that is not easily reacted with acidic substances.

2. The EGR valve of claim 1, wherein, The exhaust passage (11) comprises: a first sub-flow channel (113); and a second sub-flow channel (114), the first sub-flow channel (113) and the second sub-flow channel (114) being in communication and being arranged at an angle; wherein the protective layer (20) arranged at a position close to the second sub-flow channel (114) of the first sub-flow channel (113) and the protective layer (20) arranged at a position close to the first sub-flow channel (113) of the second sub-flow channel (114) are in one-piece structure.

3. The EGR valve of claim 1, wherein, The exhaust passage (11) comprises: a first sub-flow channel (113); and a second sub-flow channel (114), the first sub-flow channel (113) and the second sub-flow channel (114) being in communication and being arranged at an angle; wherein the protective layer (20) completely covers the inner walls of the first sub-flow channel (113) and the second sub-flow channel (114).

4. The EGR valve of claim 2 or 3, wherein, The first sub-flow channel (113) is arranged along a first direction (X), and the second sub-flow channel (114) is arranged along a second direction (Y), the second direction (Y) and the first direction (X) having a first included angle, the first included angle being greater than or equal to 45 degrees and less than or equal to 135 degrees.

5. The EGR valve of any one of claims 1-4, wherein, The protective layer (20) is in one-piece structure.

6. The EGR valve of any one of claims 1-5, wherein, The protective layer (20) comprises at least one of a stainless steel layer, a polymer coating layer, or a plastic layer.

7. The EGR valve of claim 6, wherein, The protective layer (20) is a stainless steel layer, and the outer wall surface of the protective layer (20) completely matches the inner wall surface of the exhaust passage (11).

8. The EGR valve of claim 7, wherein, The protective layer (20) is completely matched to the inner wall surface of the exhaust passage (11) by a die casting process.

9. The EGR valve of claim 8, wherein, The outer wall surface of the protective layer (20) is provided with at least one reinforcing structure (28).

10. The EGR valve of claim 9, wherein, The inner wall surface of the exhaust passage (11) is provided with at least one matching structure matched with the at least one reinforcing structure (28), wherein one of the reinforcing structure (28) and the matching structure is a groove structure, and the other of the reinforcing structure (28) and the matching structure is a protrusion structure.

11. The EGR valve of claim 10, wherein, The at least one reinforcing structure (28) comprises a plurality of reinforcing structures (28) arranged at intervals, and the at least one matching structure comprises a plurality of matching structures arranged at intervals, the plurality of matching structures and the plurality of reinforcing structures (28) being respectively arranged in correspondence.

12. The EGR valve of any one of claims 1-11, wherein, A first recessed groove (12) is arranged at a first end of the exhaust passage (11), and the protective layer (20) has a first protective portion (21) embedded in the first recessed groove (12).

13. The EGR valve of claim 12, wherein, The first recess groove (12) is arranged at an intake end of the exhaust passage (11) and extends to a first surface (14) of the valve body (10) in a direction opposite to a first direction (X) of the exhaust passage (11), and the first protection part (21) is flush with the first surface (14) of the valve body (10).

14. The EGR valve according to claim 13, further comprising a first seal (90) arranged between the first protection part (21) and a groove wall of the first recess groove (12) in an intake direction of the exhaust passage (11).

15. The EGR valve of claim 14, wherein, In the first direction (X), the first seal (90) is arranged between the first protection part (21) and the groove wall of the first recess groove (12).

16. The EGR valve of any one of claims 12-15, wherein, A second end of the exhaust passage (11) is provided with a second recess groove (13), and the protection layer (20) has a second protection part (22) embedded in the second recess groove (13).

17. The EGR valve of claim 16, wherein, The second recess groove (13) is arranged at an exhaust end of the exhaust passage (11) and extends to a second surface (15) of the valve body (10) in a second direction (Y) of the exhaust passage (11), and the second protection part (22) is flush with the second surface (15) of the valve body (10).

18. The EGR valve according to claim 17, further comprising a second seal (100) arranged between the second protection part (22) and a groove wall of the second recess groove (13) in an exhaust direction of the exhaust passage (11).

19. The EGR valve of claim 18, wherein, In the second direction (Y), the second seal (100) is arranged between the second protection part (22) and the groove wall of the second recess groove (13).

20. The EGR valve according to any one of claims 1 to 19, further comprising a valve stem (30) and a valve disc (31), wherein the valve disc (31) is connected to a first end of the valve stem (30). The protection layer (20) is provided with a valve seat (23), and the valve stem (30) is arranged in the valve seat (23). The valve stem (30) is configured to drive the valve disc (31) to move to a first position abutting against the valve seat (23) to close the exhaust passage (11), and to move to a second position away from the valve seat (23) to open the exhaust passage (11).

21. The EGR valve of claim 20, wherein, The exhaust passage (11) comprises a first sub-flow passage (113) and a second sub-flow passage (114). The protection layer (20) comprises a first sub-protection layer (24) and a second sub-protection layer (25), wherein the first sub-protection layer (24) is arranged on an inner wall of the first sub-flow passage (113), and the second sub-protection layer (25) is arranged on an inner wall of the second sub-flow passage (114). The valve seat (23) is arranged between the second sub-protection layer (25) and the first sub-protection layer (24).

22. The EGR valve of claim 21, wherein, The valve seat (23) is integrally formed with the protection layer (20).

23. The EGR valve of claim 21, wherein, The valve seat (23) is clamped between the second sub-protection layer (25) and the first sub-protection layer (24).

24. The EGR valve of any one of claims 21-23, wherein, The valve body (10) is provided with a guide channel (50) communicating with the exhaust gas channel (11), and the valve rod (30) is slidably arranged in the guide channel (50) to drive the valve plate (31) to move.

25. The EGR valve of claim 24, wherein, The protection layer (20) further comprises a third sub-protection layer (26) connected to the side of the second sub-protection layer (25) away from the first sub-protection layer (24), and the third sub-protection layer (26) wraps at least part of the inner wall of the guide channel (50) close to the exhaust gas channel (11). The EGR valve further comprises a sealing assembly (40) partially arranged between the guide channel (50) and the valve rod (30) to block the guide channel (50).

26. The EGR valve of claim 25, wherein, The sealing assembly (40) is partially embedded in the third sub-protection layer (26). The valve rod (30) penetrates the sealing assembly (40), and the inner wall of the sealing assembly (40) abuts the valve rod (30).

27. The EGR valve of claim 26, wherein, The outer wall of the sealing assembly (40) is interference-fitted with the inner wall of the third sub-protection layer (26).

28. The EGR valve of claim 26, wherein, The sealing assembly (40) comprises: a sealing seat (41) embedded in the third sub-protection layer (26); and a flexible sealing sleeve (42) embedded in the sealing seat (41), and the outer wall of the flexible sealing sleeve (42) is connected to the inner wall of the sealing seat (41), and the inner wall of the flexible sealing sleeve (42) abuts the valve rod (30).

29. The EGR valve of claim 28, wherein, The outer wall of the sealing seat (41) is interference-fitted with the inner wall of the third sub-protection layer (26).

30. The EGR valve of any one of claims 25 to 29, further comprising a driving member (60), wherein, The driving member (60) is arranged in the valve body (10) and located on the side of the guide channel (50) away from the sealing assembly (40), and the second end of the valve rod (30) away from the valve plate (31) is connected to the driving member (60), and the driving member (60) is configured to drive the valve rod (30) to move.

31. The EGR valve of any one of claims 1 to 30, further comprising a temperature sensor (70) connected to the protection layer (20).

32. An engine comprising the EGR valve of any one of claims 1 to 31.

33. A vehicle comprising the engine of claim 32.

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