CN211085595U

CN211085595U - Leakage device for simulating EGR leakage

Info

Publication number: CN211085595U
Application number: CN201922484924.4U
Authority: CN
Inventors: 谭宗慧; 韦钻国
Original assignee: Guangxi Yuchai Machinery Co Ltd
Current assignee: Guangxi Yuchai Machinery Co Ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-07-24
Anticipated expiration: 2029-12-31

Abstract

The utility model discloses a leakage device that simulation EGR leaked, it sets up in the EGR system of engine, and the EGR system includes the EGR pipeline of being connected with the blast pipe of engine, and leakage device includes mount pad and simulation leakage device. The mounting seat is detachably arranged on a mounting part on an EGR pipeline of the engine; the simulated leakage device is detachably arranged on the mounting seat and used for simulating an EGR leakage test. The utility model discloses a leak device detachably sets up in the EGR system of engine for it is more convenient to install and select the test position.

Description

Leakage device for simulating EGR leakage

Technical Field

The utility model relates to an engine test field especially relates to a leakage device that simulation EGR leaked.

Background

Currently, with the stricter emission regulations, the coming of the emission regulations of the nation six causes a plurality of engine manufacturers to select a brand new technical route according to test verification results in order to enable the engines to meet the emission regulations, and the lean burn technical route different from the technical route of the nation five is generally adopted. In the six-emission stage of China, multiple engine enterprises adopt equivalent combustion technical routes. Meanwhile, an EGR system is added for the purposes of reducing the original exhaust and exhaust temperature of the engine and the like, and a technical route of equivalent weight + EGR is formed. The EGR system simply introduces a part of exhaust of the engine into a cylinder to participate in the next round of in-cylinder combustion, and the increase of EGR under equivalent combustion can reduce the exhaust temperature of the engine, prolong the combustion duration of the engine and reduce the knocking tendency of the engine. According to the requirements of the regulations, in combination with the important influence of the equivalent + EGR in the EGR technical route, there are many contents for monitoring the EGR system in the On-board diagnostics (On-board diagnostics) regulations, one of which is the monitoring of the EGR leakage. When the engine has EGR leakage, the EGR rate is less than a certain range, which may adversely affect the combustion of the engine. For example, in the case of a gas engine, the engine is prone to knock after EGR leakage, and such abnormal combustion has a serious effect on the engine, slightly affects the combustion stability of the engine and has an adverse effect on economy, and heavily causes the engine to knock and damage the engine. In order to meet the requirements of regulations and protect the engine, and in combination with the characteristics of an EGR system, many manufacturers design a set of tooling device which can simulate different EGR leakage conditions of the engine and is used for simulating OBD faults so as to confirm the EGR leakage diagnosis threshold value.

In the prior art, the EGR leakage is simulated mainly by drilling a hole in an EGR pipeline or operating at a gasket of a joint surface of two parts on the EGR pipeline, namely, the condition of EGR leakage caused by poor sealing of the gasket is artificially manufactured. The direct drilling mode can not accurately simulate the required EGR leakage amount in one step, needs repeated operation for many times, and can damage parts per se to make the engine difficult to restore to the original state. The gasket seal is not tight, and although the original state of the engine can be easily recovered, the leakage amount is not accurately controlled, and the accurate EGR leakage amount is difficult to reproduce.

The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information constitutes prior art already known to a person skilled in the art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a leakage device that simulation EGR leaked, its detachably sets up in the EGR system of engine.

In order to achieve the above object, the utility model provides a leakage device that simulation EGR leaked, its setting is in the EGR system of engine, and the EGR system includes the EGR pipeline of being connected with the blast pipe of engine, and leakage device includes mount pad and simulation leakage device. The mounting seat is detachably arranged on a mounting part on an EGR pipeline of the engine; the simulated leakage device is detachably arranged on the mounting seat and used for simulating an EGR leakage test.

In a preferred embodiment, the number of simulated leakage devices is plural.

In a preferred embodiment, the leak holes on each simulated leak device are different sizes.

In a preferred embodiment, the EGR system further includes an EGR flow meter, an EGR valve, and an EGR gas mixer provided on the EGR line, the EGR gas mixer being connected to an air intake pipe, a gas intake pipe, and an intake manifold of the engine at the same time, and the mounting portion includes a plurality of mounting positions.

In a preferred embodiment, the plurality of mounting locations includes a first mounting location disposed between a junction of the EGR line and the exhaust pipe and the EGR flow meter.

In a preferred embodiment, the plurality of mounting locations further includes a second mounting location disposed between the EGR flow meter and the EGR valve.

In a preferred embodiment, the plurality of mounting locations further includes a third mounting location disposed between the EGR valve and the EGR gas mixer.

In a preferred embodiment, the mounting portion is a threaded hole, and the mounting seat is mounted on the mounting portion by means of a threaded connection.

In a preferred embodiment, the simulated leakage device is provided with a leakage hole, and the diameter of the leakage hole is adjustable.

In a preferred embodiment, the leakage device for simulating the EGR leakage further includes a plug and a gasket for plugging the mounting portion when the simulated EGR leakage test is not performed.

Compared with the prior art, the utility model discloses a leakage device's that simulation EGR leaked mounted position selects in a flexible way, can be according to different engine structure characteristics and arrange the convenience, selects the position of mount pad. Secondly, the leakage device of the present invention has convenience of replacement. After the welding of the mounting seat is finished, different leakage holes can be selected for mounting according to the EGR flow of different engines and the size of the EGR leakage amount to be simulated, and a device of a valve can be arranged on the simulated leakage holes to adjust the variable EGR leakage amount. Meanwhile, the leakage device can accurately simulate the leakage amount, and because the specification and the size of the leakage hole are known, accurate simulation can be carried out when EGR leakage is simulated every time. Leakage quantity is easy to reproduce, and according to the specification of the leakage hole selected in the earlier stage, the same leakage hole is selected to be installed when the same leakage quantity needs to be reproduced, so that repeated tests can be carried out. The easy reconversion, after need not this leakage device work, can be at a plug of mount pad direct mount, can be to the engine state of recovering normal. If the test simulation is needed to be continued subsequently, the test simulation can be repeatedly used.

Drawings

Fig. 1 is a schematic structural diagram of a leak device according to an embodiment of the present invention.

Description of the main reference numerals:

A-a first mounting position, B-a second mounting position, C-a third mounting position, 1-a mounting seat, 11-a simulated leakage device, 111-a leakage hole, 2-an EGR pipeline, 3-an exhaust pipe, 4-an engine, 5-an EGR flowmeter, 6-an EGR valve, 7-an EGR gas mixer, 8-an air inlet pipe, 9-a gas inlet pipe and 10-an air inlet manifold.

Detailed Description

The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited by the following detailed description.

Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.

As shown in fig. 1, fig. 1 is a schematic structural diagram of a leakage device according to an embodiment of the present invention. According to the utility model discloses preferred embodiment's a leakage device that simulation EGR leaked, it sets up in the EGR system of engine. The EGR system includes an EGR line 2 connected to an exhaust pipe 3 of an engine 4, and an EGR flow meter 5, an EGR valve 6, and an EGR gas mixer 7 provided on the EGR line 2. The EGR gas mixer 7 is simultaneously connected with an air inlet pipe 8, a gas inlet pipe 9 and an air inlet main pipe 10 of the engine 4, and the leakage device comprises a mounting seat 1 and a simulated leakage device 11. The mount 1 is detachably provided on a mounting portion on the EGR line 2 of the engine 4. The simulated leakage device 11 is detachably arranged on the mounting seat 1, and the simulated leakage device 11 can adopt quick connection modes such as threaded connection, clamping connection and the like. The simulated leak device 11 is used to simulate an EGR leak test.

In some embodiments, the mounting portion is a threaded hole provided on the EGR line 2, and the mount 1 is mounted on the mounting portion by screwing. The mounting portion may include a plurality of mounting positions, and three mounting positions, i.e., a first mounting position a, a second mounting position B, and a third mounting position C, are illustrated in the present embodiment. The first mounting position a is provided between the EGR flow meter 5 and the junction of the EGR line 2 and the exhaust pipe 3, the second mounting position B is provided between the EGR flow meter 5 and the EGR valve 6, and the third mounting position C is provided between the EGR valve 6 and the EGR gas mixer 7. Such a design can meet leak test requirements at different locations on the EGR line 2.

In some embodiments, the number of simulated leaks 11 is multiple, and the size of the leak hole 111 on each simulated leak 11 is different. The design can meet the requirement of simulating the test conditions of the leakage holes 111 with different sizes in the same test position.

In some embodiments, the diameter of the leakage hole 111 may also be sized to be adjustable, such as a regulator valve type device. The design can not only meet the requirement of simulating the test conditions of the leakage holes 111 with different sizes in the same test position, but also reduce the replacement times of the simulated leakage device 11.

In some embodiments, the leakage device for simulating EGR leakage further comprises a plug and a gasket for plugging the mounting portion when the simulated EGR leakage test is not performed, so that the whole EGR system is restored to the original state when the test is not performed.

To sum up, the utility model discloses a leakage device that simulation EGR leaked has following advantage: the position is selected flexibly, and the position of the mounting seat can be selected according to the structural characteristics and the arrangement convenience of different engines. The convenience of replacement, the back is accomplished in the mount pad welding, can let out the leakage hole of the size selection difference of leakage quantity according to the EGR flow of different engines and the EGR that needs the simulation and install, also can let out the device of a valve on the hole in the simulation, carry out variable EGR and let out leakage quantity and adjust. The simulation leakage amount is accurate, and because the specification and the size of the leakage hole are known, accurate simulation can be carried out when EGR leakage is simulated every time. Leakage quantity is easy to reproduce, and according to the specification of the leakage hole selected in the earlier stage, the same leakage hole is selected to be installed when the same leakage quantity needs to be reproduced, so that repeated tests can be carried out. The easy reconversion, after need not this leakage device work, can be at a plug of mount pad direct mount, can be to the engine state of recovering normal. If the test simulation is needed to be continued subsequently, the test simulation can be repeatedly used.

The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.

Claims

1. A leak device that simulates EGR leakage, provided in an EGR system of an engine, the EGR system including an EGR line connected to an exhaust pipe of the engine, characterized by comprising:

A mounting seat detachably provided on a mounting portion on an EGR line of an engine; and

And the simulated leakage device is detachably arranged on the mounting seat and is used for simulating an EGR leakage test.

2. The apparatus for simulating EGR leakage of claim 1 wherein said simulated leakage apparatus is plural in number.

3. The apparatus of claim 2, wherein the size of the leakage orifice is different for each of said simulated leakage apparatus.

4. The apparatus of claim 1, wherein the EGR system further comprises an EGR flow meter, an EGR valve, and an EGR gas mixer disposed on the EGR line, the EGR gas mixer being connected to an air intake pipe, a gas intake pipe, and an intake manifold of the engine at the same time, and the mounting portion comprises a plurality of mounting locations.

5. The apparatus of claim 4, wherein the plurality of mounting locations includes a first mounting location disposed between the EGR conduit connection to the exhaust pipe and the EGR flow meter.

6. The apparatus of claim 4, wherein the plurality of mounting locations further comprises a second mounting location disposed between the EGR flow meter and the EGR valve.

7. The apparatus of claim 4, wherein the plurality of mounting locations further comprises a third mounting location disposed between the EGR valve and the EGR gas mixer.

8. A leak device simulating EGR leakage according to claim 1, wherein the mounting portion is a threaded hole, and the mounting seat is mounted on the mounting portion by a threaded connection.

9. The apparatus of claim 1, wherein the apparatus has a leak hole, and wherein the leak hole is adjustable in diameter.

10. A leak device for simulating EGR leakage according to claim 1, further comprising a plug and a gasket for plugging the mounting portion when the simulated EGR leakage test is not performed.