CN217682021U - EGR engine and vehicle - Google Patents

Abstract

The utility model belongs to the technical field of exhaust gas recirculation, concretely relates to EGR engine and vehicle. The utility model discloses aim at solving the problem that EGR engine's EGR rate is low among the correlation technique. The utility model discloses a EGR engine and vehicle, exhaust gas recirculation subassembly include exhaust gas recirculation pipe, check valve, EGR valve and cooler, exhaust gas recirculation pipe has exhaust end and inlet end, and the exhaust end communicates with the blast pipe, and the inlet end communicates with first intake pipe; the one-way valve, the EGR valve and the cooler are sequentially arranged on the exhaust gas recirculation pipe, the one-way valve is located between the exhaust end and the EGR valve, and the cooler is located between the EGR valve and the air inlet end. Through the setting, because the check valve has the effect of preventing the waste gas backward flow, the waste gas behind the check valve all can flow in first intake pipe through EGR valve and cooler, compares with the cooler setting between blast pipe and check valve, makes the waste gas volume that flows in first intake pipe department increase, and then makes the EGR rate of EGR engine increase.

Description

EGR engine and vehicle

Technical Field

The embodiment of the utility model provides an exhaust gas recirculation technical field especially relates to an EGR engine and vehicle.

Background

Harmful emissions from the engine are a major source of atmospheric pollution, and the exhaust gas recirculation system can reintroduce exhaust gas from the engine into the intake pipe, where the exhaust gas enters the cylinder with the fresh air mixture, and participates in the combustion process again, to reduce the emission of nitrogen oxides from the engine.

In the related art, an EGR (Exhaust Gas Recirculation) engine is an engine having an Exhaust Gas Recirculation system, and the EGR engine includes an engine and an EGR system, where the engine has an intake pipe and an Exhaust pipe, the EGR system includes an Exhaust Gas Recirculation pipe, and a cooler, a check valve, and an EGR valve sequentially disposed on the Exhaust Gas Recirculation pipe, one end of the Exhaust Gas Recirculation pipe is communicated with the intake pipe, and the other end is communicated with the Exhaust pipe, and the cooler is close to the Exhaust pipe, and the EGR valve is close to the intake pipe. Part of the exhaust gas in the exhaust pipe flows into the exhaust gas recirculation pipe, flows through the one-way valve and the EGR valve after being cooled by the cooler, and is then introduced into the air inlet pipe, so that the exhaust gas recirculation of the engine is realized.

However, when the exhaust gas discharged from the exhaust pipe passes through the cooler, the pulse energy of the exhaust gas decreases after the exhaust gas flows into the cooler due to the large volume in the cooler, resulting in a decrease in the EGR rate of the EGR engine.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention provides an EGR engine and a vehicle to solve the technical problem of low EGR rate of the related EGR engine.

In order to achieve the above object, an embodiment of the present invention provides an EGR engine, including: the exhaust gas recirculation assembly comprises an exhaust gas recirculation pipe, a one-way valve, an EGR valve and a cooler, wherein the exhaust gas recirculation pipe is provided with an exhaust end and an air inlet end, the exhaust end is communicated with the exhaust pipe, and the air inlet end is communicated with the first air inlet pipe; the check valve the EGR valve reaches the cooler set gradually in exhaust gas recirculation pipe, just the check valve is located the exhaust end with between the EGR valve, the cooler is located the EGR valve with between the inlet end.

In some embodiments, which may include the above-described embodiments, the cylinder is plural, each of the cylinders communicates with the first intake pipe through an intake manifold, and each of the cylinders communicates with the exhaust pipe through an exhaust manifold.

In some embodiments, which may include the above embodiments, the exhaust pipe is plural, and each of the exhaust pipes communicates with at least one of the exhaust manifolds; the exhaust gas recirculation pipe comprises a first pipe section and a plurality of second pipe sections, one end of each second pipe section is communicated with the corresponding exhaust pipe, the other end of each second pipe section is communicated with one end of the first pipe section, and the other end of the first pipe section is communicated with the first air inlet pipe; the one-way valve is arranged on each second pipe section, the EGR valve and the cooler are arranged on the first pipe section, and the EGR valve is located between the one-way valve and the cooler.

In some embodiments, which may include the above embodiments, the EGR engine further includes a supercharger having an intake port and an exhaust port, the exhaust port communicating with the first intake pipe.

In some embodiments, which may include the above-described embodiments, the EGR engine further includes a second intake pipe connected between the exhaust port and the first intake pipe, and a distal end of the exhaust gas recirculation pipe is connected to the second intake pipe.

In some embodiments, which may include the above embodiments, the EGR engine further includes a cooling device for cooling air in the second intake pipe.

In some embodiments, which may include the above-mentioned embodiments, the cooling device is an intercooler, which is connected to the second intake pipe.

In some embodiments, which may include the above embodiments, the exhaust gas recirculation pipe is connected to a section of the second intake pipe between the intercooler and the first intake pipe.

In some embodiments, which may include the above embodiments, the supercharger includes a turbine and a compressor, the turbine having a first intake port, a first exhaust port, a first impeller, and a rotating shaft penetrating the first impeller, the first intake port communicating with a distal end of the exhaust pipe; the compressor is provided with a second air inlet, a second air outlet and a second impeller, the rotating shaft is further arranged on the second impeller in a penetrating mode, and the second air outlet is communicated with the first air inlet pipe.

The embodiment of the utility model provides a vehicle is still provided, including foretell EGR engine.

The embodiment of the utility model provides a vehicle includes the EGR engine, and the EGR engine includes: the exhaust gas recirculation assembly comprises an exhaust gas recirculation pipe, a one-way valve, an EGR valve and a cooler, wherein the exhaust gas recirculation pipe is provided with an exhaust end and an air inlet end, the exhaust end is communicated with the exhaust pipe, and the air inlet end is communicated with the first air inlet pipe; the one-way valve, the EGR valve and the cooler are sequentially arranged on the exhaust gas recirculation pipe, the one-way valve is located between the exhaust end and the EGR valve, and the cooler is located between the EGR valve and the air inlet end. Because the check valve has the effect of preventing the waste gas backward flow, the waste gas behind the check valve can't flow back to in the exhaust pipe, and the waste gas behind the check valve all can flow into first intake pipe through EGR valve and cooler, compares with the cooler setting between exhaust pipe and check valve, makes the waste gas volume that flows into first intake pipe department increase, and then makes EGR engine's EGR rate increase. The EGR valve is arranged in front of the cooler, and when the EGR valve is in a closed state, exhaust gas cannot reach the cooler, so that the carbon-hydrogen coverage on the heat exchange fins of the cooler can be effectively reduced, and the cooling efficiency of the cooler can be improved.

Drawings

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

Fig. 1 is a schematic structural diagram of an EGR engine according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of a check valve in an EGR engine according to an embodiment of the present invention;

fig. 3 is a cross-sectional view of the check valve of fig. 2.

Description of reference numerals:

10. a cylinder; 20. A first intake pipe;

210. an intake manifold; 30. An exhaust pipe;

310. an exhaust manifold; 40. An exhaust gas recirculation assembly;

410. an exhaust gas recirculation pipe; 411. A first tube section;

412. a second tube section; 420. A one-way valve;

421. a valve core; 422. A valve body;

423. a flow passage at the outer side of the valve core; 424. A central tapered flow passage;

425. a circular truncated cone housing; 426. A fin structure;

427. a conical surface; 428. A circular arc transition surface;

429. connecting a rib plate; 430. An EGR valve;

440. a cooler; 50. A supercharger;

510. a turbine; 520. A gas compressor;

530. a rotating shaft; 60. A second intake pipe;

70. and an intercooler.

Detailed Description

First of all, it should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. And can be adjusted as needed by those skilled in the art to suit particular applications.

Next, it should be noted that in the description of the embodiments of the present invention, the terms of direction or positional relationship indicated by the terms "inside", "outside", and the like are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or member must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Furthermore, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" or "connected" in the description of the embodiments of the present invention are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, and the two components can be communicated with each other. The specific meanings of the above terms in the embodiments of the present invention can be understood by those skilled in the art according to specific situations.

To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the attached drawings in the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

In the related art, an EGR engine is an engine having an exhaust gas recirculation system, the EGR engine includes an engine and an EGR system, the engine includes a cylinder, an intake pipe, and an exhaust pipe, the cylinder has an intake port and an exhaust port, the intake pipe communicates with the intake port, the exhaust pipe communicates with the exhaust port, fresh air enters the cylinder from the intake pipe, and is mixed with fuel and burned, chemical energy generated by burning of the fuel is converted into mechanical energy in the cylinder, and exhaust gas generated by burning of the fuel is discharged from the exhaust pipe.

The EGR system comprises an exhaust gas recirculation pipe, a cooler, a one-way valve and an EGR valve, wherein the cooler, the one-way valve and the EGR valve are sequentially arranged on the exhaust gas recirculation pipe, one end of the exhaust gas recirculation pipe is communicated with the air inlet pipe, the other end of the exhaust gas recirculation pipe is communicated with the exhaust pipe, the cooler is close to the exhaust pipe, and the EGR valve is close to the air inlet pipe. The waste gas in the exhaust pipe has pulse energy, part of the waste gas in the exhaust pipe flows into a waste gas recirculation pipe under the action of the pulse energy, flows through a one-way valve and an EGR valve after being cooled by a cooler, and then is introduced into the air inlet pipe so as to feed part of the waste gas back to the cylinder, so that the ignition delay period in the combustion process of the fuel in the cylinder is increased, the combustion rate is slowed, the highest combustion temperature in the cylinder is reduced, the high-temperature oxygen-enriched condition required by the generation of nitrogen oxides is destroyed, and the discharge amount of the nitrogen oxides is reduced.

However, when the exhaust gas discharged from the exhaust pipe passes through the cooler, the pulse energy of the exhaust gas decreases after the exhaust gas flows into the cooler due to the large volume in the cooler, and the amount of exhaust gas that can flow through the check valve decreases, resulting in a decrease in the amount of exhaust gas delivered to the intake pipe, and a decrease in the ratio of the amount of exhaust gas recirculated to the total amount of intake air taken into the cylinder (i.e., EGR rate).

The embodiment provides an EGR engine and vehicle, through making partial waste gas in the blast pipe flow through the check valve in proper order, flow into the intake pipe again behind EGR valve and the cooler, the check valve is flowed through earlier to blast pipe exhaust waste gas, because the check valve has the effect that prevents the waste gas backward flow, the waste gas behind the check valve all can flow into the intake pipe to the messenger flows into the waste gas volume increase of intake pipe department, and then makes EGR engine's EGR rate increase.

The present embodiments provide a vehicle that may be an automobile, train, motorcycle, ship, or the like that is powered by an engine, wherein the vehicle includes an EGR engine.

As shown in fig. 1, the EGR engine includes a cylinder 10, a first intake pipe 20, an exhaust pipe 30, and an exhaust gas recirculation assembly 40, the cylinder 10 having a cylinder 10 intake port and a cylinder 10 exhaust port, the first intake pipe 20 communicating with the cylinder 10 intake port, the exhaust pipe 30 communicating with the cylinder 10 exhaust port.

Fresh air enters the cylinder 10 from the first intake pipe 20, is mixed with fuel and combusted in the cylinder 10, and chemical energy generated by the combustion of the fuel is converted into mechanical energy in the cylinder 10 to power the vehicle. Exhaust gas generated by combustion of fuel is discharged from the exhaust pipe 30.

The exhaust gas recirculation assembly 40 includes an exhaust gas recirculation pipe 410, the exhaust gas recirculation pipe 410 having an exhaust end communicating with the exhaust pipe 30 and an intake end communicating with the first intake pipe 20, a check valve 420, an EGR valve 430, and a cooler 440.

The check valve 420, the EGR valve 430, and the cooler 440 are sequentially disposed in the exhaust gas recirculation pipe 410, with the check valve 420 between the exhaust end and the EGR valve 430, and the cooler 440 between the EGR valve 430 and the intake end. The exhaust gas in the exhaust pipe 30 has pulse energy, and a part of the exhaust gas in the exhaust pipe 30 flows into the exhaust gas recirculation pipe 410 under the action of the pulse energy, flows to the first intake pipe 20 through the exhaust gas recirculation pipe 410, and is further delivered to the cylinder 10, so that the ignition delay period in the combustion process of the fuel in the cylinder 10 is increased, the combustion rate is slowed, and the maximum combustion temperature in the cylinder 10 is lowered, thereby destroying the high-temperature oxygen-rich condition required for generating the nitrogen oxide, and reducing the discharge amount of the nitrogen oxide.

As shown in fig. 2 and 3, the check valve 420 is a high temperature-resistant check valve, for example, the check valve 420 may include a valve core 421 and a valve body 422 that are coaxially and fixedly connected, the valve core 421 and the valve body 422 are connected by a connecting rib 429, a valve core outer flow passage 423 is formed between the valve core 421 and the valve body 422, a central tapered flow passage 424 is provided in the valve core 421, and the central tapered flow passage 424 is radially tapered from a valve core inlet to a valve core outlet; the valve core 421 comprises a circular table housing 425 and a fin structure 426 which is connected with the large-diameter end of the circular table housing 425 and used for preventing reverse backflow, wherein one side, facing the EGR valve, of the fin structure 426 is provided with a conical surface 427, an arc transition surface 428 is arranged between the conical surface 427 and the outer peripheral surface of the circular table housing 425, and the arc length and the central angle of the arc transition surface 428 can be designed according to backflow prevention requirements. When the exhaust gas flows through the check valve 420 in the forward direction, the exhaust gas can pass through the central tapered flow passage 424 in the valve plug 421, the tapered arrangement of the central tapered flow passage 424 can accelerate the exhaust gas flowing out from the valve plug outlet, and then the pressure is reduced, compared with the valve plug inlet, the position is a relative negative pressure, the exhaust gas outside the valve plug 421 can also pass through the valve plug outside flow passage 423 under the action of the relative negative pressure, and the pressure drop of the check valve 420 is effectively reduced.

When the fluid reversely flows through the arc transition surface 428 of the fin structure 426, a larger backflow area is formed at the position under the guidance of the arc transition surface 428, and the backflow area expands a turbulent flow area at the position of the valve core outlet, so that the backflow resistance is increased, the reverse flow of the exhaust gas through the central tapered flow passage 424 and the valve core outer side flow passage 423 is reduced, and the purpose of reverse backflow prevention is achieved.

The one-way valve 420 realizes the one-way conduction effect through a self mechanical structure, is not easy to damage under the high-temperature condition and has good reliability.

The exhaust gas entering the exhaust gas recirculation pipe 410 flows through the check valve 420 first, the check valve 420 allows the exhaust gas to flow only from the exhaust pipe 30 to the EGR valve 430 and not from the EGR valve 430 to the exhaust pipe 30, thereby preventing the exhaust gas from flowing back to the exhaust pipe 30, the exhaust gas passing through the check valve 420 can flow into the first intake pipe 20 through the EGR valve 430 and the cooler 440, even though the pulse energy of the exhaust gas is reduced at the cooler 440 due to the volume inside the cooler 440, but the exhaust gas has already passed through the check valve 420 and cannot flow back to the exhaust pipe 30, and finally the amount of the exhaust gas flowing to the first intake pipe 20 is not reduced, and the pulse energy of the exhaust gas at the end of the exhaust gas recirculation pipe 410 facing the exhaust pipe 30 is not reduced, thereby ensuring the amount of the exhaust gas entering the exhaust gas recirculation pipe 410 and improving the EGR rate of the EGR engine, wherein the EGR rate is the ratio of the amount of the recirculated exhaust gas to the total amount of intake air drawn into the cylinder 10.

The EGR valve 430 guides the exhaust gas from the check valve 420 to the cooler 440, and the cooler 440 cools the exhaust gas to lower the temperature of the exhaust gas entering the first intake pipe 20. When the fuel in the cylinder 10 is not sufficiently combusted and the exhaust gas contains hydrocarbon (also called "hydrocarbon"), the EGR valve 430 is arranged in front of the cooler 440, and when the EGR valve 430 is in a closed state, the exhaust gas cannot reach the cooler 440, so that the hydrocarbon coverage on the heat exchange fins of the cooler 440 can be effectively reduced, and the cooling efficiency of the cooler 440 can be improved.

The number of the cylinders 10 may be plural, and for example, the number of the cylinders 10 may be two, three, four, five, six, or the like, each cylinder 10 is communicated with the first intake pipe 20 through the intake manifold 210, and each cylinder 10 is communicated with the exhaust pipe 30 through the exhaust manifold 310. Under the condition that the cylinder diameter and the stroke are the same, the more the number of the cylinders 10 is, the stronger the power of the EGR engine is, and the more stable the motion work is.

In implementations where there are multiple cylinders 10, there may be multiple exhaust pipes 30, with each exhaust pipe 30 communicating with at least one exhaust manifold 310, that is, each exhaust pipe 30 may receive exhaust from multiple cylinders 10.

The EGR engine is described as having six cylinders 10, two exhaust pipes 30, one of which 30 may communicate with one exhaust manifold 310, and the other exhaust pipe 30 may communicate with five exhaust manifolds 310; alternatively, one of the exhaust pipes 30 may communicate with two exhaust manifolds 310, and the other exhaust pipe 30 may communicate with four exhaust manifolds 310; alternatively, each of the exhaust pipes 30 communicates with three exhaust manifolds 310.

The exhaust gas recirculation pipe 410 may include a first pipe section 411 and a plurality of second pipe sections 412, one end of each of the second pipe sections 412 is communicated with a corresponding one of the exhaust pipes 30, the other end of each of the second pipe sections 412 is communicated with one end of the first pipe section 411, and the other end of the first pipe section 411 is communicated with the first intake pipe 20.

That is, a plurality of second pipe sections 412 are connected in parallel, each second pipe section 412 is respectively communicated with one exhaust pipe 30, the exhaust gas discharged from each exhaust pipe 30 flows into the communicated second pipe section 412, and the exhaust gas in the plurality of second pipe sections 412 is collected into the first pipe section 411 and flows into the first intake pipe 20 through the first pipe section 411.

Each second pipe section 412 is provided with a check valve 420, an EGR valve 430 and a cooler 440 is provided in the first pipe section 411, and the EGR valve 430 is located between the check valve 420 and the cooler 440.

The exhaust pipes 30 are provided in plural, so that it is possible to prevent the amount of exhaust gas entering the exhaust gas recirculation pipe 410 from being reduced due to the exhaust gas in one of the exhaust pipes 30 flowing back to the other exhaust pipe 30, thereby increasing the amount of exhaust gas entering the exhaust gas recirculation pipe, and further increasing the EGR rate of the EGR engine.

In some embodiments, the EGR engine may further include a supercharger 50, the supercharger 50 having an intake port and an exhaust port, the exhaust port being in communication with the first intake pipe 20. The supercharger 50 may include an exhaust turbocharger 50, a mechanical turbocharger 50, an electrically-assisted turbocharger 50, or the like, and ambient air is introduced into the supercharger 50 from an air inlet, compressed in the supercharger 50, and then discharged to the first intake pipe 20 from an air outlet to increase the intake air density of the EGR engine, so that the engine's power per liter can be increased. Meanwhile, the intake density of the EGR engine is increased, and the combustion efficiency of fuel oil can be improved, so that the effects of saving the fuel oil and reducing emission are achieved.

In some embodiments, the EGR engine may further include a second intake pipe 60, the second intake pipe 60 being connected between the exhaust port of the supercharger 50 and the first intake pipe 20, and ambient air enters the supercharger 50 from the intake port, is compressed in the supercharger 50, is discharged to the second intake pipe 60 from the exhaust port, and flows into the first intake pipe 20 from the second intake pipe 60.

The end of the exhaust gas recirculation pipe 410 is connected to the second intake pipe 60, and the exhaust gas in the exhaust gas recirculation pipe 410 flows into the first intake pipe 20 along with the fresh air in the second intake pipe 60.

The supercharger 50 is communicated with the first air inlet pipe 20 through the second air inlet pipe 60, and the tail end of the exhaust gas recirculation pipe 410 is connected to the second air inlet pipe 60, so that exhaust gas and fresh air can be introduced into the first air inlet pipe 20 simultaneously only by communicating one end, deviating from the supercharger 50, of the second air inlet pipe 60 with the first air inlet pipe 20, interfaces communicated with the exhaust gas and the fresh air can be prevented from being arranged on the first air inlet pipe 20 respectively, and therefore the connection structure of the first air inlet pipe 20, the second air inlet pipe 60 and the exhaust gas recirculation pipe 410 is simplified.

In some embodiments, the EGR engine may further comprise cooling means for cooling the air in the second intake pipe 60. The cooling means may comprise an air-cooled chiller or intercooler 70.

In implementations where the cooling device includes an air-cooled cooler having an air-out side facing the second air inlet duct 60, the air blown out of the air-out side may accelerate the flow of air at the second air inlet duct 60, thereby lowering the temperature of the fresh air in the second air inlet duct 60.

Preferably, the cooling device includes an intercooler 70, and the intercooler 70 is connected to the second intake pipe 60 to reduce the temperature of the fresh air compressed by the supercharger 50, so as to reduce the heat load of the EGR engine, improve the intake air amount, further increase the power of the EGR engine, and avoid the phenomenon that the EGR engine knocks or even damages flameout due to too high combustion temperature.

In addition, when the temperature of the fresh air introduced into the first intake pipe 20 is lowered, the maximum combustion temperature in the cylinder 10 is lowered, thereby destroying the high-temperature oxygen-rich condition required for the generation of nitrogen oxides and reducing the emission amount of nitrogen oxides.

Further, the exhaust gas recirculation pipe 410 is connected to a section of the second intake pipe 20 between the intercooler 70 and the first intake pipe 20, and exhaust gas discharged from the exhaust gas recirculation pipe 410 is mixed with cooled fresh air and flows to the first intake pipe 20.

In implementations where the supercharger 50 comprises a turbocharger 50, the turbocharger 50 comprises a turbine 510 and a compressor 520, the turbine 510 having a first intake port, a first exhaust port, a first impeller, and a rotating shaft 530 passing over the first impeller, the first intake port communicating with the end of the exhaust pipe 30.

The compressor 520 has a second air inlet, a second air outlet and a second impeller, the rotating shaft 530 further penetrates the second impeller, and the second air outlet is communicated with the first air inlet pipe 20.

The exhaust gas discharged from the end of the exhaust pipe 30 drives the first impeller to rotate, and since the rotating shaft 530 is disposed on the first impeller in a penetrating manner, the rotating shaft 530 rotates along with the first impeller while the first impeller rotates, and further drives the second impeller on the rotating shaft 530 to rotate. When the second impeller rotates, ambient air enters the compressor 520 from the second air inlet, is compressed by the compressor 520, and is discharged into the second air inlet pipe 60 from the second air outlet. The turbine 510 and the compressor 520 are driven to work by the exhaust gas, so that the energy is saved, and the environment is protected.

The EGR engine in the present embodiment includes: the exhaust gas recirculation system comprises a cylinder 10, a first air inlet pipe 20, an exhaust pipe 30 and an exhaust gas recirculation assembly 40, wherein the first air inlet pipe 20 and the exhaust pipe 30 are connected with the cylinder 10, the exhaust gas recirculation assembly 40 comprises an exhaust gas recirculation pipe 410, a one-way valve 420, an EGR valve 430 and a cooler 440, the exhaust gas recirculation pipe 410 is provided with an exhaust end and an air inlet end, the exhaust end is communicated with the exhaust pipe 30, and the air inlet end is communicated with the first air inlet pipe 20; the check valve 420, the EGR valve 430, and the cooler 440 are sequentially disposed in the exhaust gas recirculation pipe 410, with the check valve 420 between the exhaust end and the EGR valve 430, and the cooler 440 between the EGR valve 430 and the intake end. With the above arrangement, since the check valve 420 has an effect of preventing the exhaust gas from flowing back, the exhaust gas passing through the check valve 420 cannot flow back into the exhaust pipe 30, and the exhaust gas passing through the check valve 420 can flow into the first intake pipe 20 through the EGR valve 430 and the cooler 440, and compared with the case where the cooler 440 is provided between the exhaust pipe 30 and the check valve 420, the amount of the exhaust gas flowing into the first intake pipe 20 is increased, and the EGR rate of the EGR engine is increased. By disposing the EGR valve 430 before the cooler 440, when the EGR valve 430 is in the closed state, the exhaust gas cannot reach the cooler 440, so that the hydrocarbon coverage on the heat exchange fins of the cooler 440 can be effectively reduced, and the cooling efficiency of the cooler 440 can be improved.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications or substitutions do not depart from the scope of the invention in its corresponding aspects.

Claims (10)

1. An EGR engine, comprising: the exhaust gas recirculation assembly comprises an exhaust gas recirculation pipe, a one-way valve, an EGR valve and a cooler, wherein the exhaust gas recirculation pipe is provided with an exhaust end and an air inlet end, the exhaust end is communicated with the exhaust pipe, and the air inlet end is communicated with the first air inlet pipe;

the check valve the EGR valve reaches the cooler set gradually in exhaust gas recirculation pipe, just the check valve is located the exhaust end with between the EGR valve, the cooler is located the EGR valve with between the inlet end.

2. The EGR engine of claim 1 wherein the cylinder is plural, each of the cylinders communicates with the first intake pipe through an intake manifold, and each of the cylinders communicates with the exhaust pipe through an exhaust manifold.

3. The EGR engine of claim 2 wherein the exhaust pipe is plural, each exhaust pipe communicating with at least one exhaust manifold;

the exhaust gas recirculation pipe comprises a first pipe section and a plurality of second pipe sections, one end of each second pipe section is communicated with the corresponding exhaust pipe, the other end of each second pipe section is communicated with one end of the first pipe section, and the other end of the first pipe section is communicated with the first air inlet pipe;

the one-way valve is arranged on each second pipe section, the EGR valve and the cooler are arranged on the first pipe section, and the EGR valve is located between the one-way valve and the cooler.

4. The EGR engine of any of claims 1-3 further comprising a supercharger having an intake port and an exhaust port, the exhaust port communicating with the first intake pipe.

5. The EGR engine according to claim 4, further comprising a second intake pipe connected between the exhaust port and the first intake pipe, and an end of the exhaust gas recirculation pipe is connected to the second intake pipe.

6. The EGR engine of claim 5 further comprising cooling means for cooling air in the second intake pipe.

7. The EGR engine of claim 6 wherein the cooling device is a charge air cooler, the charge air cooler being connected to the second intake pipe.

8. The EGR engine of claim 7 wherein the exhaust gas recirculation pipe is connected to a section of the second intake pipe between the charge air cooler and the first intake pipe.

9. The EGR engine of claim 4 wherein the supercharger comprises a turbine and a compressor, the turbine having a first intake port, a first exhaust port, a first impeller, and a rotating shaft passing through the first impeller, the first intake port communicating with a distal end of the exhaust pipe;

the compressor is provided with a second air inlet, a second air outlet and a second impeller, the rotating shaft is further arranged on the second impeller in a penetrating mode, and the second air outlet is communicated with the first air inlet pipe.

10. A vehicle, characterized by comprising: an EGR engine as claimed in any one of claims 1 to 9.

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