CN214464594U

CN214464594U - Low pressure EGR system and vehicle

Info

Publication number: CN214464594U
Application number: CN202120536664.5U
Authority: CN
Inventors: 刘俊士; 李文庆; 邓灵灵; 李红政; 时双; 王闯; 吕高洋
Original assignee: Great Wall Motor Co Ltd
Current assignee: Great Wall Motor Co Ltd
Priority date: 2021-03-15
Filing date: 2021-03-15
Publication date: 2021-10-22
Anticipated expiration: 2031-03-15

Abstract

The present disclosure relates to a low-pressure EGR system and a vehicle, wherein the low-pressure EGR system includes a particulate filter and a low-pressure EGR cooler that is configured in an elongated shape and is connected upright on an exhaust gas main passage downstream of the particulate filter so that condensed water in the low-pressure EGR cooler can flow into the exhaust gas main passage by gravity. The cooler with the strip structure has small internal resistance, saves energy and has low self heat productivity. The low-pressure EGR system cooler is configured to be long-strip-shaped and arranged vertically, so that the whole EGR system has no low point, condensed water generated by gas in the branch under low-temperature environment directly flows back into an exhaust main path at the downstream of the particulate filter through the air intake of the low-pressure EGR cooler by gravity, accumulated water cannot be reserved in the EGR cooler, and the failure rate is reduced. The low-pressure EGR system provided by the disclosure can effectively solve the problems of energy consumption and fault occurrence caused by the construction and arrangement mode of the low-pressure EGR system.

Description

Low pressure EGR system and vehicle

Technical Field

The disclosure relates to the field of automobiles, in particular to a low-pressure EGR system of a diesel engine and a vehicle.

Background

EGR (Exhaust Gas Recirculation) is a technique for introducing a part of Exhaust Gas into an intake side after combustion in an automobile engine to allow the Exhaust Gas to be sucked again, and is mainly intended to reduce nitrogen oxides in the Exhaust Gas and improve fuel economy at the time of partial load. The EGR system is divided into a low-pressure EGR system and a high-pressure EGR system, and the gas taking position and the gas outlet position of the low-pressure EGR system and the high-pressure EGR system are different.

With the increasing tightening of oil consumption limit and emission regulations, low pressure EGR systems are becoming one of the indispensable systems for diesel engines. In the related art, a low-pressure EGR system is generally horizontally arranged at the rear end or exhaust side of an engine, and a cooler structure is classified into an I-type and a U-type, and whether the I-type or the U-type structure, the cooler is generally horizontally arranged and connected to other structures on a gas passage through a bellows. In the I type structure, the pipeline of bellows is longer, and low pressure EGR responsibility is poor, and the structural vibration at bellows both ends asynchronous can lead to self fracture. In the use process of the U-shaped structure, accumulated water usually exists in the cooler, and the gas flow and the cooling effect are influenced.

SUMMERY OF THE UTILITY MODEL

It is an object of the present disclosure to provide a diesel engine low pressure EGR system and vehicle that at least partially addresses the above-mentioned problems. The low-pressure EGR system can effectively solve the problem of water accumulation in an EGR cooler in the related art.

To achieve the above object, the present disclosure provides a low-pressure EGR system including a particulate filter and a low-pressure EGR cooler, and the low-pressure EGR cooler is configured in an elongated shape and is vertically connected to an exhaust main path downstream of the particulate filter so that condensed water in the low-pressure EGR cooler can flow into the exhaust main path by gravity.

Alternatively, the low-pressure EGR cooler is directly connected to the exhaust gas main passage.

Optionally, a first flange is formed at an air inlet end of the low-pressure EGR cooler, a second flange abutting against an end face of the first flange is formed on the exhaust main path, and the first flange and the second flange are connected by a threaded fastener.

Optionally, a sealing gasket is disposed between the first flange and the second flange.

Optionally, the low pressure EGR system further comprises a supercharger assembly and an outlet duct connected between the low pressure EGR cooler and the supercharger assembly, the outlet duct extending gradually upward from the low pressure EGR cooler to the supercharger assembly.

Optionally, the low-pressure EGR system further includes an air outlet connection pipe arranged at an air outlet end of the EGR cooler and an air inlet connection pipe arranged at an air inlet end of the supercharger assembly, and two ends of the air outlet pipe are respectively fixed with the air outlet connection pipe and the air inlet connection pipe through clamps.

Optionally, the low-pressure EGR system further comprises a low-pressure EGR valve and an air outlet connection pipe arranged at an air outlet end of the EGR cooler;

the air outlet end of the low-pressure EGR cooler is provided with a third flange, the low-pressure EGR valve is provided with a fourth flange, the air outlet connecting pipe is provided with a fifth flange, and the third flange, the fourth flange and the fifth flange are sequentially in end face butt joint and are connected through threaded fasteners.

Optionally, the air outlet pipe is made of rubber.

Optionally, the low pressure EGR cooler comprises a water inlet pipe and a water outlet pipe connected to the engine cooling system, and the water inlet pipe and the water outlet pipe are respectively made of rubber.

According to yet another aspect of the present disclosure, there is also provided a vehicle including a low pressure EGR system according to the above.

With the above technical solution, in the low-pressure EGR system provided by the present disclosure, the structure includes a particulate filter and a low-pressure EGR cooler, the low-pressure EGR cooler is configured in a long shape and is vertically connected to the exhaust main passage downstream of the particulate filter, and the long-shaped EGR cooler has a small internal resistance, saves energy, and has a low self-heating value. The low-pressure EGR system cooler is configured to be long-strip-shaped and arranged vertically, so that the whole EGR system has no low point, condensed water generated by gas in the branch under low-temperature environment directly flows back into an exhaust main path at the downstream of the particulate filter through the air intake of the low-pressure EGR cooler by gravity, accumulated water cannot be reserved in the EGR cooler, and the failure rate is reduced. Therefore, the low-pressure EGR system provided by the disclosure can effectively solve the problems of energy consumption and fault occurrence caused by the construction and arrangement of the low-pressure EGR system.

Additional features and advantages of the disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:

FIG. 1 is a schematic illustration of a low pressure EGR system provided by an exemplary embodiment of the present disclosure.

Fig. 2 is a partial enlarged view of a portion a in fig. 1, wherein the supercharger assembly and the intake manifold have been removed from fig. 1 in order to avoid interference.

Fig. 3 is a schematic diagram illustrating the connection of the low-pressure EGR valve and the low-pressure EGR outlet pipe in the low-pressure EGR system in the embodiment shown in fig. 1.

Description of the reference numerals

1-a particulate filter; 101-main exhaust path; 102-a second flange; 2-a low pressure EGR cooler; 201-a first flange; 202-a water inlet pipe; 203-water outlet pipe; 204-a third flange; 3-a low pressure EGR valve; 301-a fourth flange; 4-air outlet connecting pipe; 401-a fifth flange; 5-air outlet pipe; 6-a supercharger assembly; 601-air inlet connecting pipe; a1 — first direction;

Detailed Description

The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

In the present disclosure, where the terms of orientation such as "up" and "down" are used without being contrary to the description, they are defined according to the actual arrangement state of the low pressure EGR system, and in particular, reference may be made to the directions of the drawings shown in fig. 1 and 2, and the terms "first" and "second" are used for the purpose of distinguishing different components and are not sequential or significant. Furthermore, in the following description, when referring to the figures, the same reference numbers in different figures denote the same or similar elements, unless otherwise explained.

First, in the low-pressure EGR system, exhaust gas discharged from the engine is discharged to the outside of the vehicle through an exhaust main path, a branch path is formed in the exhaust main path, and components such as a low-pressure EGR cooler and a low-pressure EGR valve are provided in the branch path.

According to an embodiment of the present disclosure, there is provided a low-pressure EGR system, as shown in fig. 1 and 2, which includes a particulate filter 1 and a low-pressure EGR cooler 2, and the low-pressure EGR cooler 2 is configured in an elongated shape and is connected upright on an exhaust gas main path 101 downstream of the particulate filter 1, so that condensed water in the low-pressure EGR cooler can flow into the exhaust gas main path by gravity. It should be noted here that the aforementioned "vertical connection" means that the elongated (or so-called I-shaped) EGR cooler 2 extends substantially in the vertical direction, and the lowest point thereof is located at the end thereof. A particulate filter is one type of aftertreatment and in the most preferred embodiment of the present disclosure, a particulate filter is used to adsorb solid particulate matter in the exhaust gas before it enters the low pressure EGR cooler 2 or the like. In other embodiments of the present disclosure, the particulate filter may also be a particulate trap and a catalyzed particulate trap.

With the above technical solution, in the low-pressure EGR system provided by the present disclosure, the structure thereof includes the particulate filter 1 and the low-pressure EGR cooler 2, and the low-pressure EGR cooler 2 is configured in the shape of a long bar and is vertically connected to the main exhaust path 101 downstream of the particulate filter 1, and the long bar-shaped cooler has small internal resistance, saves energy, and has low self-heat generation. The long strip shape of the low-pressure EGR system cooler 2 and the vertical arrangement of the low-pressure EGR system cooler can lead the whole EGR system to have no low point, and condensed water generated by gas in the branch circuit under the low-temperature environment can directly flow back into the exhaust main circuit 101 at the downstream of the particulate filter 1 through the gas taking port of the low-pressure EGR cooler 2 by gravity, so that no accumulated water is reserved in the EGR cooler 2, and the failure rate is reduced. Therefore, the low-pressure EGR system provided by the disclosure can effectively solve the problems of energy consumption and fault occurrence caused by the construction and arrangement of the low-pressure EGR system.

It should be noted that the main exhaust path 101 downstream of the particulate filter 1 may be a connection pipe directly connected to the particulate filter 1, and the connection pipe may be a metal pipe and may be fixed to the particulate filter 1 by welding. Of course, in other embodiments of the present disclosure, the connecting pipe may be connected to the particulate filter 1 by other connecting methods, and the present disclosure is not limited thereto, and those skilled in the art may adaptively select the connecting pipe according to actual needs.

According to an embodiment of the present disclosure, referring to fig. 2, the low-pressure EGR cooler 2 may be connected directly to the main exhaust gas circuit 101. That is, no pipeline is provided between the low-pressure ERG cooler 2 and the exhaust main path 101, so that the responsiveness of the low-pressure EGR system can be significantly improved, and the problem of pipeline breakage due to inconsistent structural vibrations at both ends of the pipeline does not exist. In addition, since the vertically arranged low pressure ERG cooler 2 has a long strip structure, its own length is short, which also contributes to improving the responsiveness of the low pressure ERG system.

The direct connection of low-pressure ERG cooler 2 to main exhaust path 101 may be achieved by any suitable means, for example, according to one embodiment, as shown in fig. 2, the intake end of low-pressure EGR cooler 2 may be formed with a first flange 201, main exhaust path 101 may be formed with a second flange 102 that interfaces with first flange 201, and first flange 201 and second flange 102 may be connected by threaded fasteners. In this embodiment, the gas intake port that low pressure EGR cooler 2 and main exhaust path 101 link to each other is end face connection, does not have intake bellows structure, and the low pressure EGR system can directly get gas to particulate filter 1 through the gas intake port, makes particulate filter 1 and low pressure EGR cooler 2 vibration synchronous, avoids the cracked hidden danger of bellows that exists among the traditional low pressure EGR system, can save the arrangement space simultaneously, shortens the pipeline, reduces the response time of low pressure EGR system.

Further, as mentioned above, a sealing gasket may be disposed between the first flange 201 and the second flange 102, so as to ensure the sealing performance between the low pressure EGR cooler 2 and the exhaust main path 101, and the sealing gasket may be made of a metal material or a rubber material, which is not limited by the present disclosure.

According to an embodiment of the present disclosure, as shown in fig. 1, the low-pressure EGR system further includes a supercharger assembly 6 and an outlet duct 5 connected between the low-pressure EGR cooler 2 and the supercharger assembly 6, the outlet duct 5 being a part of the branch described above. The outlet pipe 5 is configured to extend gradually upward from the low-pressure EGR cooler 2 to the supercharger assembly 6, so that condensation formed in the outlet pipe 5 can also flow smoothly into the exhaust main passage 101 via the low-pressure ERG cooler 2.

Further, according to an embodiment of the present disclosure, as shown in fig. 1, the low pressure EGR system further includes an air outlet connection pipe 4 disposed at an air outlet end of the EGR cooler 2 and an air inlet connection pipe 601 disposed at an air inlet end of the supercharger assembly 6, and the air inlet connection pipe 601 may be fixed to the supercharger assembly 6 by bolts. The two ends of the air outlet pipe 5 can be fixed with the air outlet connecting pipe 4 and the air inlet connecting pipe 601 through a hoop respectively. Wherein the air outlet adapter 4 is arranged below the air inlet adapter 601. In addition, according to an embodiment of the present disclosure, the material of the air outlet pipe 5 is a rubber material, so as to be conveniently connected to the air outlet connecting pipe 4 and the air inlet connecting pipe 601 through a clamp.

According to an embodiment of the present disclosure, as shown in fig. 3, the low pressure EGR system further includes a low pressure EGR valve 3 for controlling gas circulation in the system, the outlet end of the low pressure EGR cooler 2 is formed with a third flange 204, the low pressure EGR valve 3 is provided with a fourth flange 301, the outlet connection pipe 4 is formed with a fifth flange 401, and the third flange 204, the fourth flange 301 and the fifth flange 401 are sequentially end-butted and connected by a threaded fastener along the first direction a 1. That is, the low-pressure EGR cooler 2, the low-pressure EGR valve 3, and the outlet joint 4 may be connected together by a set of fasteners. The connecting mode can effectively reduce redundant connecting parts and redundant connecting pieces, save materials and shorten the length of the pipeline. In addition, a sealing gasket may be respectively disposed between the third flange and the fourth flange, and between the fourth flange and the fifth flange, and the material of the sealing gasket is not limited in this disclosure, and reference may be made to the sealing gasket between the first flange 201 and the second flange 102.

Further, according to an embodiment of the present disclosure, as shown in fig. 1, the low pressure EGR cooler 2 is provided with a water inlet pipe 202 and a water outlet pipe 203; the inlet pipe 202 and the outlet pipe 203 are connected to the engine cooling system, i.e. the cooling water of the engine cooling system is used to provide a cooling effect for the low-pressure EGR cooler. Here, the inlet pipe 202 and the outlet pipe 203 may be made of the same material as the outlet pipe 5, for example, a rubber material.

According to an embodiment of the present disclosure, when the low pressure EGR system operates, the main exhaust path 101 connected to the gas intake port directly takes gas from the downstream of the particulate filter 1, the exhaust gas enters the low pressure EGR cooler 2 from the gas intake port, the exhaust gas in the low pressure EGR cooler 2 is cooled by the cooling water provided by the water inlet pipe 202 and the water outlet pipe 203, and after the gas is cooled to a suitable range, the exhaust gas is discharged through the gas outlet pipe 4, and is finally transmitted to the supercharger assembly 6 through the gas outlet pipe 5 and the gas inlet pipe 601. The vertical arrangement mode of the low-pressure EGR system can ensure that the pipeline is shortest, effectively improves the responsiveness of the low-pressure EGR system, shortens the response time, reduces the emission and the oil consumption to a certain extent, and meanwhile, the problem of pipeline fracture and water accumulation caused by the inconsistency of vibration of the particulate filter 1 and an engine can be effectively avoided in a corrugated pipe-free connection mode, the market failure occurrence rate is reduced, and the after-sale maintenance cost is reduced.

On the basis of the scheme, the vehicle comprises the low-pressure EGR system, and has all the advantages of the low-pressure EGR system, and the detailed description is omitted.

The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims

1. A low-pressure EGR system comprising a particulate filter (1) and a low-pressure EGR cooler (2), characterized in that the low-pressure EGR cooler (2) is configured in an elongated shape and is connected upright on an exhaust main path (101) downstream of the particulate filter (1) so that condensed water in the low-pressure EGR cooler (2) can flow into the exhaust main path (101) by gravity.

2. The low-pressure EGR system according to claim 1, characterised in that the low-pressure EGR cooler (2) is connected directly to the main exhaust gas circuit (101).

3. The low-pressure EGR system according to claim 2, wherein an intake end of the low-pressure EGR cooler (2) is formed with a first flange (201), and the exhaust main passage (101) is formed with a second flange (102) that abuts an end surface of the first flange (201), and the first flange (201) and the second flange (102) are connected by a threaded fastener.

4. A low-pressure EGR system according to claim 3 wherein a sealing gasket is provided between the first flange (201) and the second flange (102).

5. The low-pressure EGR system according to claim 1, characterized in that the low-pressure EGR system further comprises a supercharger assembly (6) and an outlet duct (5) connected between the low-pressure EGR cooler (2) and the supercharger assembly (6), the outlet duct (5) gradually extending upward from the low-pressure EGR cooler (2) to the supercharger assembly (6).

6. The low pressure EGR system according to claim 5, further comprising an outlet connection pipe (4) provided at an outlet end of the EGR cooler (2) and an inlet connection pipe (601) provided at an inlet end of the supercharger assembly (6), wherein both ends of the outlet pipe (5) are fixed to the outlet connection pipe (4) and the inlet connection pipe (601) by means of a clamp, respectively.

7. The low-pressure EGR system according to claim 5, characterized in that the low-pressure EGR system further comprises a low-pressure EGR valve (3) and an outlet connection (4) provided at the outlet end of the EGR cooler (2);

the gas outlet end of low pressure EGR cooler (2) is formed with third flange (204), low pressure EGR valve (3) are provided with fourth flange (301), it is formed with fifth flange (401) to give vent to anger takeover (4), third flange (204) fourth flange (301) and fifth flange (401) terminal surface butt joint in proper order and pass through threaded fastener and connect.

8. A low-pressure EGR system according to claim 5, characterized in that the outlet duct (5) is of rubber material.

9. A low pressure EGR system according to any of claims 1-8, characterized in that the low pressure EGR cooler (2) comprises a water inlet pipe (202) and a water outlet pipe (203) connected to the engine cooling system, the water inlet pipe (202) and the water outlet pipe (203) each being of a rubber material.

10. A vehicle comprising a low pressure EGR system according to any of claims 1-9.