CN115898716A - Low pressure exhaust gas recirculation system, engine and vehicle - Google Patents

Abstract

The invention provides a low-pressure exhaust gas recirculation system, an engine and a vehicle. The low-pressure exhaust gas recirculation system includes a cooler, a drainer, and a supercharger. The supercharger includes a turbine and a compressor connected to the turbine. The turbine is used to connect with the exhaust manifold of the engine, and the compressor is used to connect with the intake air of the engine. The manifold is connected; the cooler is connected with the turbine and the compressor; the drain is connected with the cooler and the compressor, and the compressor sends gas to the drain so that the pressure in the drain is lower than that in the cooler. The low-pressure waste gas recirculation system provided by the invention has high reliability.

Description

Low pressure exhaust gas recirculation system, engine and vehicle

technical field

The invention relates to the technical field of vehicles, in particular to a low-pressure exhaust gas recirculation system, an engine and a vehicle.

Background technique

In order to further reduce the energy consumption of the engine, the engine will use the exhaust gas recirculation system (exhaust gasrecirculation, EGR) to reintroduce part of the exhaust gas from the engine into the cylinder, reduce the combustion temperature in the cylinder, increase the compression ratio, and then reduce energy consumption. Among them, the EGR system is mainly divided into a high-pressure EGR system and a low-pressure EGR system.

In related technologies, the low-pressure EGR system takes exhaust gas from behind the turbine of the engine supercharger, and the exhaust gas passes through EGR cooler, EGR valve and other components and returns to the front of the engine to mix with fresh intake air.

However, in the above-mentioned low-pressure EGR system, the condensed water generated by cooling the exhaust gas easily enters the compressor of the supercharger and causes damage to the compressor of the supercharger.

Contents of the invention

The invention provides a low-pressure exhaust gas recirculation system, an engine and a vehicle to solve the technical problem that the condensed water produced by cooling the exhaust gas easily enters the compressor of the supercharger and causes damage to the compressor of the supercharger.

In a first aspect, the present invention provides a low-pressure exhaust gas recirculation system, which is applied to an engine. The low-pressure exhaust gas recirculation system includes a cooler, a drainer, and a supercharger. The supercharger includes a turbine and a compressor connected to the turbine. It is used to connect with the exhaust manifold of the engine, and the compressor is used to connect with the intake manifold of the engine;

The cooler is connected to the turbine and the compressor;

The drainer is connected with the cooler and the compressor, and the compressor delivers gas to the drainer so that the pressure in the drainer is lower than the pressure in the cooler.

In a possible implementation manner, in the low-pressure exhaust gas recirculation system provided by the present invention, the drainer includes a drainer body, the drainer body is provided with a first channel and a second channel, and one end of the first channel is connected to the cooler, The other end of the first passage communicates with the outside, the extension direction of the first passage is consistent with the extension direction of the drainer body, one end of the second passage is connected with the compressor, and the other end of the second passage communicates with the first passage;

The cooler has a drain, and the drain communicates with the first channel.

In a possible implementation manner, in the low-pressure exhaust gas recirculation system provided by the present invention, the second channel includes a first connecting section and a second connecting section, one end of the first connecting section is connected to the compressor, and the other end of the first connecting section One end is connected to one end of the second connecting section, and the other end of the second connecting section communicates with the first channel;

The extension direction of the second connection section is consistent with the extension direction of the first channel, and the extension direction of the first connection section and the extension direction of the second connection section have an included angle.

In a possible implementation manner, in the low-pressure exhaust gas recirculation system provided by the present invention, the inner diameter of the end of the second connecting section away from the first connecting section is smaller than the inner diameter of the end of the second connecting section close to the first connecting section.

In a possible implementation manner, in the low-pressure exhaust gas recirculation system provided by the present invention, the drainer further includes a heating jacket, the outer wall of the heating jacket is connected to the drainer body, and the heating jacket is used to communicate with the cylinder head of the engine to form a heating jacket. The circuit through which the antifreeze fluid circulates.

In a possible implementation manner, in the low-pressure exhaust gas recirculation system provided by the present invention, the drainer body has a recessed portion, and at least part of the heating sleeve is embedded in the recessed portion.

In a possible implementation manner, the low-pressure exhaust gas recirculation system provided by the present invention further includes a catalytic converter and a control valve, and the catalytic converter is connected to the turbine;

The control valve is arranged in the connecting pipeline between the cooler and the compressor.

In a possible implementation manner, the low-pressure exhaust gas recirculation system provided by the present invention further includes an air intake throttle valve, an air filter, and an air intake intercooler;

The air filter is connected to the compressor, and the intake throttle valve is set in the connecting pipeline between the air filter and the compressor;

The compressor is connected to the intake intercooler, which is used to connect with the intake manifold of the engine.

In a second aspect, the present invention provides an engine, including an engine body and the low-pressure exhaust gas recirculation system provided in the above-mentioned first aspect connected to the engine body.

In a third aspect, the present invention provides a vehicle, including a vehicle body and the engine provided in the above second aspect connected to the vehicle body.

The low-pressure exhaust gas recirculation system, engine and vehicle provided by the present invention, the low-pressure exhaust gas recirculation system is provided with a cooler, a drainer, a supercharger, the supercharger includes a turbine and a compressor connected to the turbine, and the exhaust gas of the turbine and the engine Manifold connection, the compressor is connected to the intake manifold of the engine. The cooler is connected with the turbine, and the cooler is connected with the compressor, and the drain is connected with the cooler, and the drain is connected with the compressor. Use the compressor to deliver the gas compressed by the compressor to the drainer, so that the pressure in the drainer is lower than the pressure in the cooler, so that the condensed water is easily sucked into the drainer, thus effectively preventing the condensed water from entering the supercharger In the compressor of the supercharger, the compressor of the supercharger is damaged.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a schematic structural diagram of a low-pressure exhaust gas recirculation system provided by an embodiment of the present invention;

Fig. 2 is a schematic structural diagram of a drainer in a low-pressure exhaust gas recirculation system provided by an embodiment of the present invention;

Fig. 3 is a left view of the drainer in the low-pressure exhaust gas recirculation system provided by the embodiment of the present invention;

Fig. 4 is a top view of the drainer in the low-pressure exhaust gas recirculation system provided by the embodiment of the present invention;

FIG. 5 is a schematic structural view of an engine provided by an embodiment of the present invention;

Fig. 6 is a schematic structural diagram of a vehicle provided by an embodiment of the present invention.

Explanation of reference signs:

100 - cooler;

200 - drainer;

210-drain body;

211 - the first channel;

212 - the second channel;

2121-the first connecting segment;

2122 - the second connecting segment;

213 - depression;

220 - heating jacket;

300-supercharger;

310 - turbine;

320-compressor;

400 - engine;

410 - exhaust manifold;

420 - intake manifold;

430 - cylinder head;

440-engine body;

500 - catalytic converter;

600-control valve;

700- intake throttle valve;

800-air filter;

900-intake intercooler;

1000-low pressure exhaust gas recirculation system;

1100 - vehicle;

1110 - Vehicle body.

Detailed ways

In the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it may be a fixed connection, or an indirect connection through an intermediary, or It is the connection between two elements or the interaction relationship between two elements. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In the description of the present invention, the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer" etc. indicate The orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation or be configured in a specific orientation. and operation, and therefore should not be construed as limiting the invention.

The terms "first", "second", and "third" (if any) in the description and claims of the present invention and the above drawings are used to distinguish similar objects and not necessarily to describe a specific order or priority. It is to be understood that the data so used are interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of practice in sequences other than those illustrated or described herein.

Furthermore, the terms "comprising" and "having", as well as any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or maintenance tool comprising a series of steps or units need not be limited to the expressly listed Instead, other steps or elements not explicitly listed or inherent to the process, method, product or maintenance tool may be included.

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

In related technologies, the EGR system is mainly divided into a high-pressure EGR system and a low-pressure EGR system. The high-pressure EGR system takes exhaust gas from the front of the turbine of the supercharger, and the exhaust gas returns to the engine intake pipe through the EGR cooler, EGR valve and other components, and is combined with the fresh intake air. gas mix. The driving force of the exhaust gas is the higher exhaust pressure. The low-pressure EGR system takes exhaust gas from the turbine of the supercharger, generally from the post-treatment (catalytic converter), and the exhaust gas passes through the EGR cooler, EGR valve and other components and returns to the engine compressor to mix with fresh intake air. The exhaust gas is driven by the suction of the compressor of the lower pressure supercharger.

In the low-pressure EGR system, when the high-temperature exhaust gas flows through the EGR cooler, a large amount of condensed water is generated because the gas temperature drops below the water dew point. At this time, because the internal pressure of the EGR cooler is lower than the external atmospheric pressure, the condensed water is discharged to the The atmosphere is more difficult, and the condensed water is easily carried into the compressor by the gas, causing damage to the impeller. If it enters the cylinder, it will have a negative impact on the combustion of the engine.

In order to solve the above-mentioned technical problems, the low-pressure exhaust gas recirculation system provided by the present invention is provided with a drainer, the drainer is connected to the cooler, and the drainer is connected to the compressor, and the compressor is used to transport the gas compressed by the compressor to the drainer. gas, so that a low-pressure zone is formed in the drainer, that is, the pressure in the low-pressure zone in the drainer is lower than the pressure in the cooler, and the condensed water can be discharged into the atmosphere through the drainer under the action of the pressure difference, thereby effectively avoiding The impeller is damaged by the gas being brought into the compressor, and it can improve the reliability of the engine.

Fig. 1 is a schematic structural diagram of a low-pressure exhaust gas recirculation system provided by an embodiment of the present invention.

1, the low-pressure EGR system 1000 provided by the present invention is applied to an engine 400. The low-pressure EGR system 1000 includes a cooler 100, a drainer 200, and a supercharger 300. The supercharger 300 includes a turbine 310. The compressor 320 is connected with the turbine 310 , the turbine 310 is used for connecting with the exhaust manifold 410 of the engine 400 , and the compressor 320 is used for connecting with the intake manifold 420 of the engine 400 .

The cooler 100 is connected to the turbine 310 , and the cooler 100 is connected to the compressor 320 .

The drainer 200 is connected to the cooler 100 , and the drainer 200 is connected to the compressor 320 , and the compressor 320 delivers gas to the drainer 200 so that the pressure in the drainer 200 is lower than the pressure in the cooler 100 .

During use, part of the exhaust gas discharged from the exhaust manifold 410 enters the cooler 100 , the condensed water produced by the exhaust gas enters the drain 200 , and part of the gas enters the intake manifold 420 of the engine 400 through the compressor 320 .

Specifically, the bottom of the cooler 100 has a drain port. In order to prevent gas from overflowing from the drain port, the size of the drain port is small, and the internal pressure of the cooler 100 is lower than the external atmospheric pressure. It is more difficult.

Therefore, by setting the drainer 200, the drainer 200 communicates with the drain port of the condenser, and the compressor 320 is used to transport the gas compressed by the compressor to the drainer 200, so that the pressure in the drainer 200 is lower than that in the cooler 100. Due to the high pressure, the condensed water is easily sucked into the drainer 200, and then discharged into the atmosphere through the drainer 200.

It can be understood that the gas compressed by the compressor 320 is delivered to the drainer 200 by the compressor 320, so that the pressure in the drainer 200 is lower than the pressure in the cooler 100, which is difficult to implement, simple in structure, and takes up little space. This facilitates the layout of the low-pressure exhaust gas recirculation system 1000 .

The low-pressure exhaust gas recirculation system 1000 provided in this embodiment is provided with a cooler 100, a drainer 200, and a supercharger 300. The supercharger 300 includes a turbine 310 and a compressor 320 connected to the turbine 310. The turbine 310 is connected to the engine 400. The exhaust manifold 410 is connected, and the compressor 320 is connected to the intake manifold 420 of the engine 400 . The cooler 100 is connected to the turbine 310 , and the cooler 100 is connected to the compressor 320 . The drainer 200 is connected to the cooler 100 , and the drainer 200 is connected to the compressor 320 . Utilize the compressor 320 to transport the gas compressed by the compressor 320 to the drainer 200, so that the pressure in the drainer 200 is lower than the pressure in the cooler 100, so that the condensed water is easily sucked into the drainer 200, thereby effectively avoiding The condensed water enters the compressor 320 of the supercharger 300 , causing damage to the compressor 320 of the supercharger 300 .

Fig. 2 is a schematic structural view of the drainer in the low-pressure exhaust gas recirculation system provided by the embodiment of the present invention, Fig. 3 is a left view of the drainer in the low-pressure exhaust gas recirculation system provided by the embodiment of the present invention, and Fig. 4 is a schematic diagram of the drainer provided by the embodiment of the present invention Top view of the drainer in the low-pressure exhaust gas recirculation system of .

2 to 4, the drainer 200 includes a drainer body 210, the drainer body 210 is provided with a first channel 211 and a second channel 212, one end of the first channel 211 is connected to the cooler 100, and the first channel 211 The other end of the first channel 211 communicates with the outside, and the extending direction of the first channel 211 is consistent with the extending direction of the drain body 210 . In this way, the overall volume of the drainer 200 is small, occupies a small space, has a simple structure, and is easy to process.

One end of the second channel 212 is connected to the compressor 320 , and the other end of the second channel 212 is located in the first channel 211 , that is, the other end of the second channel 212 communicates with the first channel 211 .

Wherein, the first channel 211 is a condensed water discharge channel, and the second channel 212 is a gas channel.

Specifically, in order to save space, one end of the drain body 210 abuts against the bottom of the cooler 100 , so that the first channel 211 communicates with the drain of the cooler 100 .

When in use, use the compressor 320 to transport the gas compressed by the compressor 320 to the second channel 212, so that the pressure in the first channel 211 is lower than the pressure in the cooler 100, and the condensed water is easily sucked into the first channel 211 , and then discharged into the atmosphere through the first channel 211.

In a possible implementation manner, the second channel 212 includes a first connecting section 2121 and a second connecting section 2122, one end of the first connecting section 2121 is connected to the compressor 320, and the other end of the first connecting section 2121 is connected to the second connecting section 2121. One end of the connecting section 2122 is connected, and the other end of the second connecting section 2122 communicates with the first channel 211 .

Wherein, the extension direction of the second connection section 2122 is consistent with the extension direction of the first channel 211 , and the extension direction of the first connection section 2121 and the extension direction of the second connection section 2122 have an included angle.

It can be understood that the extending direction of the first connecting section 2121 and the extending direction of the second connecting section 2122 have an included angle, so that the connection position between the drainer 200 and the compressor 320 can be set on the side wall of the drainer 200 to facilitate the second The layout of the first channel 211 and the second channel 212 makes the overall structure of the drainer 200 compact.

Specifically, the extending direction of the first connecting section 2121 and the extending direction of the second connecting section 2122 may be perpendicular to each other.

It should be noted that, in order to reduce the pressure loss of the gas compressed by the compressor 320 delivered by the compressor 320 to the second channel 212 , one end of the first connecting section 2121 and one end of the second connecting section 2122 are evenly connected in transition.

In another possible implementation manner, the extending direction of the second channel 212 is consistent with the extending direction of the first channel 211 .

In order to increase the flow rate of the gas delivered by the compressor 320 to the second channel 212 , the inner diameter of the end of the second connecting section 2122 away from the first connecting section 2121 is smaller than the inner diameter of the end of the second connecting section 2122 close to the first connecting section 2121 . In this way, the amount of gas delivered by the compressor 320 to the second channel 212 can be reduced, thereby reducing energy consumption.

Specifically, as shown in FIG. 2 , the inner diameter of the end of the second connecting section 2122 away from the first connecting section 2121 gradually decreases.

It should be noted that, in order to reduce the size of the drainer 200 and reduce the occupied space, the inner diameter of the end of the first channel 211 facing away from the cooler 100 is smaller than the inner diameter of the part of the first channel 211 containing the second channel 212 .

In some embodiments, the drainer 200 further includes a heating jacket 220 , the outer wall of the heating jacket 220 is connected to the drainer body 210 , and the heating jacket 220 is used to communicate with the cylinder head 430 of the engine 400 to form a circuit for circulating antifreeze.

It should be noted that the inner cavity of the heating jacket 220 is isolated from both the first channel 211 and the second channel 212 .

It can be understood that, in a cold environment, the condensed water is likely to freeze and block the drain port of the cooler 100 , resulting in a failure that the condensed water cannot be discharged. Therefore, by setting the heating jacket 220, the heating jacket 220 and the cylinder head 430 of the engine 400 form a heating waterway, and the antifreeze in the cylinder head 430 is circulated to the heating jacket 220, so that the heat of the antifreeze is passed through the heating jacket 220 and the drain. The device body 210 is passed into the first channel 211.

Moreover, the heat of the gas in the second channel 212 is transferred to the first channel 211, which can also play a heating effect.

In order to improve the heating effect, the drainer body 210 has a recessed portion 213 , and at least part of the heating sleeve 220 is embedded in the recessed portion 213 . In this way, the distance from the heating jacket 220 to the first channel 211 can be reduced, thereby improving the heat transfer efficiency of the antifreeze liquid and improving the utilization rate of the heat of the antifreeze liquid.

Wherein, in order to facilitate the connection between the heating jacket 220 and the cylinder head 430 of the engine 400 , the extending direction of the heating jacket 220 and the extending direction of the first channel 211 have an included angle.

Exemplarily, the extending direction of the heating jacket 220 and the extending direction of the first channel 211 may be perpendicular to each other.

In a possible implementation manner, the low-pressure exhaust gas recirculation system 1000 further includes a catalytic converter 500 and a control valve 600 , the catalytic converter 500 is connected with the turbine 310 , and the cooler 100 is connected with the catalytic converter 500 .

The control valve 600 is provided in the connecting pipeline between the cooler 100 and the compressor 320 .

Among them, the catalytic converter 500 is used to convert CO, HC, and NO _x in the exhaust gas into gases harmless to human body.

Wherein, the control valve 600 is used to control the amount of exhaust gas entering the compressor 320 .

In some embodiments, the low-pressure EGR system 1000 further includes an air intake throttle valve 700 , an air filter 800 and an air intake intercooler 900 .

The air filter 800 is connected to the compressor 320 , and the intake throttle valve 700 is arranged in the connecting pipeline between the air filter 800 and the compressor 320 .

The compressor 320 is connected with the intake intercooler 900 , and the intake intercooler 900 is used for connecting with the intake manifold 420 of the engine 400 .

Wherein, the intake throttle valve 700 is used to control the amount of fresh air entering the compressor 320 .

Wherein, the air filter 800 is used to remove impurities in the fresh air.

Wherein, the intake air intercooler 900 is used to cool down the gas entering the engine 400 .

Fig. 5 is a schematic structural diagram of an engine provided by an embodiment of the present invention.

Referring to FIG. 5 , the engine 400 provided by the present invention includes an engine body 440 and the low-pressure exhaust gas recirculation system 1000 provided in the above embodiments connected to the engine body 440 .

Wherein, the structure and principle of the low-pressure exhaust gas recirculation system 1000 have been described in detail in the above-mentioned embodiments, and will not be repeated here in this embodiment.

The engine 400 provided in this embodiment can reduce failures of the engine 400 and improve the reliability of the engine 400 by providing the engine body 440 and the low-pressure exhaust gas recirculation system 1000 connected to the engine body 440 .

Fig. 6 is a schematic structural diagram of a vehicle provided by an embodiment of the present invention.

Referring to FIG. 6 , the vehicle 1100 provided by the present invention includes a vehicle body 1110 and the engine 400 provided in the above-mentioned embodiment connected to the vehicle body 1110 .

Wherein, the structure and principle of the engine 400 have been described in detail in the above-mentioned embodiments, and will not be repeated here in this embodiment.

In the vehicle provided in this embodiment, by setting the vehicle body 1110 and the engine 400 connected to the vehicle body 1110, the reliability of the engine 400 is high, thereby improving the overall reliability of the vehicle 1100 and improving user experience.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. scope.

Claims (10)

1. A low-pressure exhaust gas recirculation system, which is characterized in that it is applied to an engine, and the low-pressure exhaust gas recirculation system includes a cooler, a drainer, and a supercharger, and the supercharger includes a turbine and a turbine connected to the turbine a compressor, the turbine is used to connect with the exhaust manifold of the engine, and the compressor is used to connect with the intake manifold of the engine; the cooler is connected to the turbine and the compressor; The drainer is connected with the cooler and the compressor, and the compressor delivers gas to the drainer so that the pressure in the drainer is lower than the pressure in the cooler. 2. The low-pressure exhaust gas recirculation system according to claim 1, wherein the drainer comprises a drainer body, the drainer body is provided with a first channel and a second channel, and the first channel One end is connected to the cooler, the other end of the first passage communicates with the outside, and the extension direction of the first passage is consistent with the extension direction of the drainer body; One end of the second channel is connected to the compressor, and the other end of the second channel is in communication with the first channel; The cooler has a water drain communicating with the first channel. 3. The low-pressure exhaust gas recirculation system according to claim 2, wherein the second channel comprises a first connecting section and a second connecting section, one end of the first connecting section is connected to the compressor, The other end of the first connection section is connected to one end of the second connection section, and the other end of the second connection section communicates with the first channel; The extension direction of the second connection section is consistent with the extension direction of the first channel, and the extension direction of the first connection section has an included angle with the extension direction of the second connection section. 4. The low-pressure exhaust gas recirculation system according to claim 3, wherein the inner diameter of the end of the second connecting section away from the first connecting section is smaller than the end of the second connecting section close to the first connecting section inner diameter. 5. The low-pressure exhaust gas recirculation system according to any one of claims 2 to 4, wherein the drainer further comprises a heating jacket, the outer wall of the heating jacket is connected to the drainer body, and the heating jacket The sleeve is used to communicate with the cylinder head of the engine to form a circuit for the antifreeze to circulate. 6 . The low-pressure exhaust gas recirculation system according to claim 5 , wherein the drainer body has a recessed portion, and at least part of the heating jacket is embedded in the recessed portion. 7 . 7. The low-pressure exhaust gas recirculation system according to any one of claims 1 to 4, further comprising a catalytic converter and a control valve, the catalytic converter is connected to the turbine, the cooler is connected to the the catalytic converter connection described above; The control valve is arranged in the connecting pipeline between the cooler and the compressor. 8. The low-pressure exhaust gas recirculation system according to any one of claims 1 to 4, further comprising an air intake throttle valve, an air filter and an air intake intercooler; The air filter is connected to the compressor, and the intake throttle valve is arranged in the connecting pipeline between the air filter and the compressor; The compressor is connected with the intake intercooler, and the intake intercooler is used for connecting with the intake manifold of the engine. 9. An engine, characterized by comprising an engine body and the low-pressure exhaust gas recirculation system according to any one of claims 1 to 8 connected to the engine body. 10. A vehicle, characterized by comprising a vehicle body and the engine according to claim 9 connected to the vehicle body.

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