Exhaust gas recirculation valve of internal combustion engine

Abstract

The exhaust gas recirculation valve of the internal combustion engine comprises a valve body, a first exhaust passage and a second exhaust passage are arranged in the valve body, and a bypass outlet and a bypass inlet are formed in the upper side and the lower side of the valve body respectively. A valve plate A and a valve plate C are arranged above the first exhaust passage and the second exhaust passage through a rotating shaft A. A valve plate B and a valve plate D are arranged below the first exhaust passage and the second exhaust passage through a rotating shaft B. The rotating shaft A and the rotating shaft B are connected with a brake through a connecting rod mechanism. The gas flow direction of the valve is controlled by controlling the opening degree of the valve plate, and exhaust gas enters a turbine of the turbocharger after passing through the exhaust gas recirculation valve under the normal operation working condition; during low-temperature cold start, engine exhaust is introduced into exhaust after-treatment by controlling the opening degree of the valve plate in the valve, so that a catalyst can reach the working temperature more quickly under the low-temperature cold start condition of an engine, the catalytic efficiency is improved, and pollution components of emissions in the exhaust are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the internal combustion engine technical field more specifically relates to a kind of internal combustion engine exhaust gas recirculation valve. BACKGROUND

[0002] Exhaust gas recirculation valve (EGR valve) is the execution element of EGR system, EGR valve is mainly assembled between engine exhaust system and intake system, its function is to control a certain amount of exhaust gas through its pipeline to enter combustion chamber again to participate in combustion, to realize the emission of harmful substances such as reduction of nitrogen oxides, carbon dioxide, while can improve compression ratio to prevent knock, has certain contribution to fuel economy, EGR valve is very important, key component in exhaust gas recirculation device.

[0003] The task of EGR system is to make the recirculation amount of exhaust gas reach the best condition at each working point, so that the combustion process is always in the most ideal condition, and finally ensure that the pollution components in the emission are the lowest. The technical route of the current national six EGR system turbocharged engine is that exhaust aftertreatment is after the supercharger, in fact, it is more appropriate that exhaust gas directly enters exhaust aftertreatment system during cold start. During the cold start stage, the exhaust temperature of the engine is low, and direct entry into exhaust aftertreatment can make the catalyst reach the working temperature faster, thereby improving the catalytic efficiency. In addition, direct entry into exhaust aftertreatment can reduce the emission of harmful substances in exhaust gas, because exhaust aftertreatment can effectively convert NOx into ammonia and water, further reducing emission pollution.

[0004] By contrast, after entering the exhaust aftertreatment after the supercharger, the complexity of the exhaust system may be increased, and the working temperature of the supercharger is high, which may affect the rapid heating of the exhaust aftertreatment. Although the supercharger can drive the turbine, this has no direct relationship with the optimized emission treatment of the exhaust aftertreatment, and during the cold start stage, the exhaust temperature is low, and after passing through the supercharger, the exhaust temperature may be further reduced, which is not conducive to the rapid start and efficient work of the exhaust aftertreatment. SUMMARY

[0005] The technical problem to be solved by the utility model is to provide an internal combustion engine exhaust gas recirculation valve, under normal operating conditions, exhaust gas enters the turbine of turbocharger after passing through the exhaust gas recirculation valve; during low-temperature cold start, by controlling the opening of the valve plate in the valve, the engine exhaust is introduced into exhaust aftertreatment, so that the catalyst can reach the working temperature faster under the condition of low-temperature cold start of the engine, thereby improving the catalytic efficiency.

[0006] To solve the above technical problems, the technical scheme adopted by the utility model is as follows.

[0007] The utility model provides an internal combustion engine exhaust gas recirculation valve, including the valve body, be provided with two first exhaust passage and second exhaust passage who links the engine exhaust pipe and the supercharger turbine flow channel import in the valve body, the bypass path export and bypass path import who links first exhaust passage and second exhaust passage are provided with respectively on the upper and lower sides of valve body, first exhaust passage and second exhaust passage are provided with valve piece A and valve piece C respectively for blocking the bypass path export of corresponding passage through the pivot A on the top, first exhaust passage and second exhaust passage are provided with valve piece B and valve piece D respectively for blocking the bypass path import of corresponding passage through the pivot B on the lower side, pivot A and pivot B are connected with the brake for driving valve piece rotation through the connecting rod mechanism.

[0008] Further optimize technical scheme, the connecting rod mechanism includes the connecting rod C who is arranged on the brake pivot through the bearing in the middle part, the connecting rod A and the connecting rod B who are arranged respectively in the same direction are provided with in both ends of connecting rod C, the connecting rod A is connected with pivot A, and the connecting rod B is connected with pivot B.

[0009] Further optimize technical scheme, the main passage limiting stop point for limiting the downward rotation position of connecting rod B is provided with on the valve body below connecting rod B.

[0010] Further optimize technical scheme, the bypass path limiting stop point for limiting the upward rotation position of connecting rod B is provided with on the valve body above connecting rod B.

[0011] Since the above technical scheme is adopted, the technical progress achieved by the utility model is as follows.

[0012] The internal combustion engine exhaust gas recirculation valve provided by the utility model controls the gas flow direction of the valve by controlling the opening degree of the valve piece, under normal operating conditions, exhaust gas enters the turbine of the turbocharger after passing through the exhaust gas recirculation valve, under low-temperature cold start, the opening degree of the valve piece in the valve is controlled to introduce the engine exhaust gas into exhaust gas aftertreatment, so that the catalyst can reach the working temperature more quickly under the condition of low-temperature cold start of the engine, thereby improving the catalytic efficiency and reducing the pollution components of the exhaust emissions. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is the structural schematic diagram of the utility model;

[0014] Figure 2 It is the internal structure section view of the utility model;

[0015] Figure 3 It is the structural schematic diagram of the first exhaust passage and the second exhaust passage of the utility model communication state;

[0016] Figure 4 It is the structural schematic diagram of the bypass path communication state of the utility model;

[0017] Figure 5 Figure 2 is a schematic view of the opening limiting structure of the first exhaust passage and the second exhaust passage of the present application;

[0018] Figure 6 Figure 3 is a schematic view of the opening limiting structure of the bypass passage of the present application;

[0019] Figure 7 Figure 4 is a schematic view of the connecting rod mechanism of the present application.

[0020] Wherein: 1. valve body, 1a. main passage limiting stop, 1b. bypass passage limiting stop, 2. first exhaust passage, 3. second exhaust passage, 4. bypass passage outlet, 5. bypass passage inlet, 6. valve piece A, 7. valve piece B, 8. valve piece C, 9. valve piece D, 10. rotating shaft A, 11. rotating shaft B, 12. connecting rod mechanism, 121. connecting rod A, 122. connecting rod B, 123. connecting rod C, 13. brake. DETAILED DESCRIPTION

[0021] The present application will be further described in detail below in combination with the drawings and specific embodiments.

[0022] An internal combustion engine exhaust gas recirculation valve, in combination Figures 1 to 7 As shown in the figure, it comprises a valve body 1, the valve body 1 is provided with a first exhaust passage 2 and a second exhaust passage 3, the first exhaust passage 2 and the second exhaust passage 3 are communicated with the engine exhaust pipe and the inlet of the turbocharger turbine flow channel, the upper and lower sides of the valve body 1 are respectively provided with a bypass passage outlet 4 and a bypass passage inlet 5, the bypass passage outlet 4 and the bypass passage inlet 5 are communicated with the first exhaust passage 2 and the second exhaust passage 3.

[0023] The upper part of the first exhaust passage 2 and the second exhaust passage 3 is provided with a valve piece A 6 and a valve piece C 8 through a rotating shaft A 10, which is used to block the bypass passage outlet 4 of the corresponding passage, the lower part of the first exhaust passage 2 and the second exhaust passage 3 is provided with a valve piece B 7 and a valve piece D 9 through a rotating shaft B 11, which is used to block the bypass passage inlet 5 of the corresponding passage, the rotating shaft A 10 and the rotating shaft B 11 are connected with a brake 13 through a connecting rod mechanism 12, the brake 13 is connected with the connecting rod mechanism 12 through a rotating shaft, which is used to drive the valve piece to rotate, the brake 13 drives the connecting rod mechanism to act through the rotating shaft, drives the rotating shaft A 10 and the rotating shaft B 11 to rotate, the valve piece A 6 and the valve piece C 8 are assembled on the rotating shaft A 10 and rotate with the rotating shaft A 10, the valve piece B 7 and the valve piece D 9 are assembled on the rotating shaft B 11 and rotate with the rotating shaft B 11, realizing the switching of the main passage and the bypass passage.

[0024] The connecting rod mechanism 12 includes a connecting rod C123 arranged in the middle of the brake 13 rotating shaft through a bearing, both ends of the connecting rod C123 are respectively provided with a connecting rod A121 and a connecting rod B122, the connecting rod A121 and the connecting rod B122 are in the same direction, the connecting rod A121 is connected with the rotating shaft A10, the connecting rod B122 is connected with the rotating shaft B11, the brake drives the connecting rod C to rotate through the rotating shaft, the connecting rod C drives the connecting rod A and the connecting rod B at both ends to rotate, the connecting rod A and the connecting rod B drive the rotating shaft A and the rotating shaft B to rotate, so as to drive the valve plate A and the valve plate C on the rotating shaft A and the valve plate B and the valve plate D on the rotating shaft B to rotate, so as to realize the switching of the main passage and the bypass passage.

[0025] The valve body 1 below the connecting rod B122 is provided with a main passage limiting stop point 1a, which is used to limit the position of the connecting rod B122 rotating downward, and the first exhaust passage and the second exhaust passage opening limiting structure is as shown in Figure 5 The connecting rod B rotates downward to the main passage limiting stop point 1a, the valve plate A and the valve plate C respectively block the bypass passage outlet 4 above the first exhaust passage 2 and the second exhaust passage 3, and the valve plate B and the valve plate D respectively block the bypass passage inlet 5 below the first exhaust passage 2 and the second exhaust passage 3, at this time, the exhaust of the engine exhaust pipe enters the supercharger turbine flow passage inlet through the first exhaust passage 2 and the second exhaust passage 3, which meets the demand of the engine exhaust under normal working condition, and its working state is as shown in Figure 3 .

[0026] The valve body 1 above the connecting rod B122 is provided with a bypass passage limiting stop point 1b, which is used to limit the upward rotating position of the connecting rod B, when the engine is started at low temperature, the brake 13 drives the connecting rod mechanism to drive the rotating shaft A and the rotating shaft B to rotate through the rotating shaft, and drives the valve plate A and the valve plate C on the rotating shaft A and the valve plate B and the valve plate D on the rotating shaft B to close, when the connecting rod B rotates upward to the bypass passage limiting stop point 1b, as shown in Figure 6 , the valve plate on the rotating shaft A and the rotating shaft B rotates to the position as shown in Figure 4 , the first exhaust passage 2 and the second exhaust passage 3 are closed, the bypass passage outlet 4 above the first exhaust passage 2 and the second exhaust passage 3 and the bypass passage inlet 5 below the first exhaust passage 2 and the second exhaust passage 3 are opened, so that the exhaust of the engine exhaust pipe enters the valve first exhaust passage 2 and the second exhaust passage 3, and then flows to the exhaust bypass passage outlet 4 arranged above the first exhaust passage 2 and the second exhaust passage 3, and finally converges into the exhaust aftertreatment inlet; the exhaust aftertreatment exhaust enters the bypass passage inlet 5 of the valve from the exhaust aftertreatment outlet, and then enters the outlet of the valve first exhaust passage 2 and the second exhaust passage 3, and finally enters the supercharger turbine flow passage inlet; it is more suitable for the exhaust to directly enter the exhaust aftertreatment (selective catalytic reduction) system during cold start.

[0027] In the cold start stage, the exhaust temperature of the engine is low, and the direct entry of the exhaust gas aftertreatment can make the catalyst reach the working temperature faster, thereby improving the catalytic efficiency. In addition, the direct entry of the exhaust gas aftertreatment can reduce the emission of harmful substances in the exhaust gas, because the exhaust gas aftertreatment can effectively convert NOx into ammonia and water, further reducing the emission pollution.

[0028] In contrast, after the supercharger, the exhaust gas aftertreatment may increase the complexity of the exhaust system, and the working temperature of the supercharger is high, which may affect the rapid heating of the exhaust gas aftertreatment catalyst. Although the supercharger can drive the turbine, it has nothing to do with the optimized emission treatment of the exhaust gas aftertreatment, and in the cold start stage, the exhaust gas temperature is low, and after the supercharger, the exhaust gas temperature may be further reduced, which is not conducive to the rapid start and efficient work of the exhaust gas aftertreatment.‌

[0029] The utility model provides a kind of internal combustion engine exhaust gas recirculation valve, the opening of valve piece is controlled, the gas flow direction of valve is controlled, exhaust gas is introduced into the turbine of turbocharger after passing through exhaust gas recirculation valve under normal operating condition;When low-temperature cold start, the opening of valve piece in valve is controlled, engine exhaust is introduced into exhaust gas aftertreatment, so that engine can make catalyst reach working temperature faster under low-temperature cold start condition, thereby improving catalytic efficiency, achieve the pollution component of reducing the pollution of emission in exhaust gas.

Claims

1. An internal combustion engine exhaust gas recirculation valve characterized by: The valve body (1) is provided with two first exhaust passages (2) and second exhaust passages (3) for connecting the engine exhaust pipe and the inlet of the turbo turbine flow channel, the bypass outlet (4) and the bypass inlet (5) of the valve body (1) are respectively provided with the bypass outlet (4) and the bypass inlet (5) of the first exhaust passage (2) and the second exhaust passage (3); the valve piece A (6) and the valve piece C (8) are respectively arranged above the first exhaust passage (2) and the second exhaust passage (3) through the rotating shaft A (10) for blocking the corresponding bypass outlet (4), the valve piece B (7) and the valve piece D (9) are respectively arranged below the first exhaust passage (2) and the second exhaust passage (3) through the rotating shaft B (11) for blocking the corresponding bypass inlet (5), the rotating shaft A (10) and the rotating shaft B (11) are connected through the connecting rod mechanism (12) for driving the valve piece to rotate.

2. An internal combustion engine exhaust gas recirculation valve as claimed in claim 1, characterised in that: The connecting rod mechanism (12) includes the connecting rod C (123) arranged on the rotating shaft of the brake (13) through the bearing in the middle, the connecting rod A (121) and the connecting rod B (122) with the same direction are respectively arranged at both ends of the connecting rod C, the connecting rod A (121) is connected with the rotating shaft A (10), and the connecting rod B (122) is connected with the rotating shaft B (11).

3. An internal combustion engine exhaust gas recirculation valve as claimed in claim 2, characterised in that: The main passage limiting stop point (1a) is arranged on the valve body (1) below the connecting rod B (122) for limiting the downward rotating position of the connecting rod B (122).

4. An internal combustion engine exhaust gas recirculation valve as in claim 2, wherein: The bypass passage limiting stop point (1b) is arranged on the valve body (1) above the connecting rod B (122) for limiting the upward rotating position of the connecting rod B (122).

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