CN117167659A

CN117167659A - An engine bench exhaust pipeline structure and testing method

Info

Publication number: CN117167659A
Application number: CN202311151289.2A
Authority: CN
Inventors: 刘海云; 郭禹; 侯轩; 张超
Original assignee: Beinei Diesel Engine Tianjin Co ltd
Current assignee: Beinei Diesel Engine Tianjin Co ltd
Priority date: 2023-09-07
Filing date: 2023-09-07
Publication date: 2023-12-05

Abstract

The invention discloses an engine bench exhaust pipeline structure and a testing method, and belongs to the technical field of engine testing; the exhaust gas treatment system comprises a head exhaust gas connecting pipeline, a tail exhaust gas connecting pipeline, a pipeline switch control valve group and a post-treatment component pipeline, wherein the exhaust gas connecting pipeline is provided with a main exhaust gas pipeline, a first bypass pipeline and a second bypass pipeline, the main exhaust gas pipeline, the first bypass pipeline and the second bypass pipeline are all provided with the pipeline switch control valve group, the post-treatment component pipeline comprises a DOC (DOC), a DPF (diesel particulate filter) component pipeline and an SCR (selective catalytic reduction) component pipeline, the head exhaust gas connecting pipeline and the tail exhaust gas connecting pipeline are all provided with first connecting flanges, and two ends of equidistant empty pipes are all provided with second connecting flanges.

Description

Engine bench exhaust pipeline structure and testing method

Technical Field

The invention relates to an engine bench exhaust pipeline structure and a testing method, and belongs to the technical field of engine testing.

Background

With the continuous strict requirements for low emission of internal combustion engines, an exhaust gas purifying device, i.e. an engine aftertreatment, is added in addition to the need for upgrading the engine body. The current mainstream off-road national four-engine aftertreatment technology route is the oxidation catalytic converter DOC (Diesel Oxidation Catalyst) + particulate trap DPF (Diesel Particulate Filter) + optional catalytic reduction technology SCR (Selective Catalytic Reduction). The engine and the post-treatment device are tested continuously to complete the matching of the whole engine.

For example, publication number CN116066217a provides a method for controlling particles in vehicle exhaust and related apparatus, the method comprising: acquiring current operation condition data of a target vehicle; determining a corresponding particulate matter control strategy according to the current operation condition data; and controlling the opening and closing degrees of a first control valve and a second control valve according to a particulate matter control strategy, wherein the first control valve is used for controlling the opening and closing of a first exhaust pipeline after the TWC of the target vehicle, the second control valve is used for controlling the opening and closing of a second exhaust pipeline after the TWC, and a GPF (general purpose surface) is arranged in the second exhaust pipeline and used for capturing particulates. Through the scheme, the effective control of the particulate matter quantity of the vehicle tail gas can be realized under various working conditions.

The system bypass pipeline can effectively control the quantity of the particulate matters in the tail gas of the vehicle. The method can be further perfected in the stage of calibration test development of the engine bench. In the development of aftertreatment products, more methods of testing in series on the engine block exhaust line are used. In the early stage of product development, the design modification is usually carried out on the exhaust pipeline of the engine rack for many times, and the work of modifying the exhaust pipeline for each post-treatment technical route design can greatly increase the development cost, and a large amount of time is required, so that the product development period is not facilitated to be shortened.

In view of the foregoing, there is a need for an engine rack test pipeline structure and method that is convenient, time-saving, efficient in testing, low in development cost, easy to disassemble, and highly versatile in testing.

Disclosure of Invention

The invention aims to provide an engine bench exhaust pipeline structure and a testing method, which are used for solving the problems of high cost, low testing efficiency and the like in the current engine post-treatment research and development.

In order to achieve the above purpose, the present invention provides the following technical solutions: an engine bench exhaust pipeline structure and a testing method; comprises a head exhaust connecting pipeline, a tail exhaust connecting pipeline, a pipeline switch control valve group and a post-treatment component pipeline, wherein the exhaust connecting pipeline is provided with a main exhaust pipeline, a first bypass pipeline and a second bypass pipeline, the main exhaust pipeline, the first bypass pipeline and the second bypass pipeline are all provided with the pipeline switch control valve group, the post-treatment component pipeline comprises a DOC (DOC), a DPF (diesel particulate filter) component pipeline and an SCR (selective catalytic reduction) component pipeline, the head exhaust connecting pipeline and the tail exhaust connecting pipeline are both provided with first connecting flanges, the two ends of equidistant hollow pipes are both provided with second connecting flanges, the outer walls of the post-treatment component and the whole pipeline before are both stuck with heat preservation and insulation layers, the exhaust connecting pipeline is connected with an engine exhaust manifold, the first bypass pipeline is connected with the DOC, the DPF component pipeline and the SCR component pipeline, the second bypass pipeline is connected with the DOC and the DPF component pipeline, the main exhaust pipeline is connected with the tail exhaust pipeline by using equidistant empty pipes, the post-treatment component pipeline is connected with the tail exhaust pipeline, and the pipeline switch control valve group comprises a pipeline switch control valve I, a pipeline switch control valve II, a pipeline switch control valve III, a pipeline switch control valve IV, a pipeline switch control valve V and a pipeline switch control valve VI;

preferably, a switch control valve is arranged in the exhaust connecting pipeline, and the opening or closing of the control valve can simulate the use of a main exhaust pipeline or a bypass pipeline;

preferably, the pipeline switch control valve group is a one-way valve;

preferably, the first connecting flange and the second connecting flange are matched;

preferably, the front pipeline of the post-treatment assembly is stuck with a heat preservation and insulation layer;

preferably, the bypass line may actually test the post-treatment exhaust resistance, and the engine exhaust back pressure may be simulated by the tail exhaust back pressure valve when the main exhaust line is in use.

The invention also provides a test method of the engine bench exhaust pipeline structure, which comprises the following specific steps:

step one: a worker selects a proper configuration scheme of the post-processing assembly according to the technical parameters of the actual development engine, a switch control valve group is required to be installed on a connecting pipeline, and a heat preservation and insulation layer is required to be adhered to the outer walls of the post-processing assembly and the previous integral pipeline;

step two: when an original row test of the engine is carried out, a switch is used for controlling the valve group to close the first bypass pipeline and the second bypass pipeline; when the engine tail exhaust test is carried out, the first or second bypass pipeline is opened by using the switch control valve group according to the selection scheme, the main exhaust pipeline is closed at the same time, and after parameters such as the exhaust resistance of the actual aftertreatment component are collected, the simulation is carried out through the exhaust back pressure valve, and the original exhaust development test of the engine is carried out again.

Step three: and after the test is finished, processing the related test data, optimizing a post-processing design scheme, and finally finishing the complete machine matching test.

The invention has the beneficial effects that: according to the invention, the effect of improving the post-treatment test efficiency of the engine is achieved by optimizing the structure of the exhaust pipeline of the bench, the pipeline switch control valve group is used for simulating the arrangement mode of the exhaust pipeline under different post-treatment component configuration schemes, and the test overview is strong. Frequent replacement and repeated disassembly and assembly of workers can be avoided, the early test work is greatly reduced, and the development cost and development period are reduced.

Drawings

FIG. 1 is a flow chart of a method for testing an exhaust line of an engine rack according to the present invention.

Fig. 2 is a schematic structural view of an exhaust pipeline structure of an engine rack according to the present invention.

Fig. 3 is a schematic diagram of an engine rack exhaust pipe structure arrangement according to the present invention.

201. A first connection flange; 202. a first bypass line; 203. a second bypass line; 204. a main exhaust line; 301. an engine; 302. an exhaust manifold; 303. a second connection flange; 304. a head exhaust connection line; 305. the pipeline is opened and closed to control the valve I; 306. pipeline switch control valve II; 307. a pipeline switch control valve III; 308. DOC; 309. a DPF; 310. SCR; 311. equidistant hollow tubes; 312. pipeline switch control valve IV; 313. a pipeline switch control valve V; 314. a pipeline switch control valve six; 315. tail exhaust connecting pipeline; 316. an exhaust back pressure valve.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in fig. 1, and the words "inner" and "outer" refer to directions toward or away from, respectively, the geometric center of a particular component.

Example 1:

according to the figures 1-3: the invention provides an engine bench exhaust pipeline structure and a testing method; the exhaust gas treatment device comprises a head exhaust gas connecting pipeline 304, a tail exhaust gas connecting pipeline 315, a pipeline switch control valve group and a post-treatment component pipeline, wherein the exhaust gas connecting pipeline is provided with a main exhaust gas pipeline 204, a first bypass pipeline 202 and a second bypass pipeline 203, the main exhaust gas pipeline 204, the first bypass pipeline 202 and the second bypass pipeline 203 are all provided with the pipeline switch control valve group, the post-treatment component pipeline comprises a DOC308, a DPF309 component pipeline and an SCR310 component pipeline, the head exhaust gas connecting pipeline 304 and the tail exhaust gas connecting pipeline 315 are all provided with a first connecting flange 201, two ends of the equidistant air pipe 311 are all provided with second connecting flanges 303, the post-treatment component and the outer wall of the whole pipeline in front are all adhered with heat insulation layers, the exhaust gas connecting pipeline is connected with an engine 301 exhaust manifold 302, the first bypass pipeline 202 is connected with the DOC308, the DPF309 component pipeline and the SCR310 component pipeline, the second bypass pipeline 203 is connected with the DOC308 and the DPF309 component pipeline, the main exhaust gas pipeline 204 is connected with the tail exhaust gas pipeline 311 by using equidistant air pipes 311, the tail exhaust gas pipeline is connected with the tail exhaust gas pipeline switch control valve group, and the post-treatment pipeline control valve group comprises five switch control valves 314 and four switch control valves, namely, the exhaust gas switch control valve groups;

in the invention, a switch control valve is arranged in the exhaust connecting pipeline, and the opening or closing of the control valve can simulate and select the main exhaust pipeline 204 or the bypass pipeline, so that the arrangement mode of the exhaust pipeline under different aftertreatment configuration schemes is realized for test;

in the invention, the pipeline switch control valve group is a one-way valve, so that the back flow of tail gas can be prevented;

in the invention, the first connecting flange 201 is matched with the second connecting flange 303, and the connecting flange mode can keep the stability and the tightness of the pipeline connection;

the front pipeline of the post-treatment component is stuck with a heat preservation and insulation layer, so that heat loss can be prevented;

the bypass line in the present invention may actually test the post-treatment exhaust resistance and simulate the engine 301 exhaust back pressure through the tail exhaust back pressure valve 316 when the main exhaust line 204 is in use.

In a state where the aftertreatment component is mounted, the opening/closing control valve group of the head exhaust pipe and the second bypass pipe 203 is closed, and relevant aftertreatment test data such as the actual exhaust resistance of the aftertreatment component of the engine 301 is tested, stored and processed.

And then the opening and closing control valve groups of the head exhaust pipeline and the first bypass pipeline 202 are closed, and relevant post-treatment test data such as actual exhaust resistance of the post-treatment components of the test engine 301 are stored and processed.

The sectional test post-processing can help staff accurately analyze the actual condition of each development sample, and after the test is completed, an optimized post-processing improvement design scheme is provided according to data result analysis, and finally, the matching test of the post-processing and the whole machine is completed.

Example 2:

and in the state that the aftertreatment component is not installed, the on-off control valve group of the bypass pipeline is closed, the on-off control valve group of the main exhaust pipeline 204 is opened, and meanwhile, the exhaust back pressure simulation test of the engine 301 is realized through the exhaust back pressure valve 316 door, so that the original row development test of the whole engine 301 is completed.

The invention and its embodiments have been described above with no limitation, and the actual construction is not limited to the embodiments of the invention as shown in the drawings. In summary, if one of ordinary skill in the art is informed by this disclosure, a structural manner and an embodiment similar to the technical solution should not be creatively devised without departing from the gist of the present invention.

Claims

1. An engine bench exhaust pipeline structure, characterized by: including a head exhaust connection pipeline (304), a tail exhaust connection pipeline (315), a pipeline switch control valve group and an aftertreatment component pipe The exhaust connection pipeline is provided with a main exhaust pipeline (204), a first bypass pipeline (202) and a second bypass pipeline (203). The main exhaust pipeline (204) , the first bypass pipeline (202) and the second bypass pipeline (203) are both equipped with the pipeline switch control valve group, and the post-processing component pipeline includes DOC (308), DPF (309) Component pipeline and SCR (310) component pipeline, the head exhaust connection pipeline (304) and the tail exhaust connection pipeline (315) are both equipped with a first connecting flange (201), the equidistant Second connecting flanges (303) are provided at both ends of the empty pipe (311). The outer walls of the post-processing component and the previous integral pipeline are all covered with thermal insulation layers. The exhaust connecting pipeline is connected to the engine (301). ) exhaust manifold (302), the first bypass pipeline (202) is connected to the DOC (308), DPF (309) assembly pipeline and SCR (310) assembly pipeline, and the second The bypass pipeline (203) is connected to the DOC (308) and DPF (309) component pipelines, and the main exhaust pipeline (204) is connected to the rear exhaust pipeline using an equidistant empty pipe (311). The post-processing component pipeline is connected to the tail exhaust pipeline, and the pipeline switch control valve group includes pipeline switch control valve one (305), pipeline switch control valve two (306), and pipeline switch control valve three. (307), pipeline switch control valve four (312), pipeline switch control valve five (313), pipeline switch control valve six (314).

2. An engine bench exhaust pipeline structure according to claim 1, characterized in that: a switch control valve is provided inside the exhaust connection pipeline, and the opening or closing of the control valve can simulate the selection of the main exhaust pipe. Gas line (204) or bypass line.

3. An engine bench exhaust pipeline structure according to claim 1, characterized in that: the pipeline switch control valve group is a one-way valve.

4. An engine stand exhaust pipeline structure according to claim 1, characterized in that the first connecting flange (201) and the second connecting flange (303) cooperate.

5. An engine bench exhaust pipeline structure according to claim 1, characterized in that: the pipeline in front of the aftertreatment assembly is affixed with a thermal insulation layer.

6. An engine bench exhaust pipeline structure according to claim 1, characterized in that: the bypass pipeline can actually test the exhaust resistance after treatment, when using the main exhaust pipeline (204) The engine (301) exhaust back pressure can be simulated through the rear exhaust back pressure valve (316).

7. An engine bench exhaust pipeline structure according to claim 1, characterized in that: the specific steps of the test method are as follows:

Step 1: The staff selects the appropriate after-treatment component configuration plan based on the technical parameters of the actual developed engine (301). It is necessary to install a switch control valve group on the connecting pipeline, and the outer wall of the after-treatment component and the previous overall pipeline needs to be insulated. heat insulation;

Step 2: When conducting the original exhaust test of the engine (301), use the switch to control the valve group to close the first and second bypass lines (203); when conducting the rear exhaust test of the engine (301), use the switch to control the valve group according to the selection plan Open the first or second bypass pipeline (203), and close the main exhaust pipeline (204) at the same time. After collecting the exhaust resistance and other parameters of the actual after-treatment component, simulate it through the exhaust back pressure valve (316), and again Carry out original row development testing of engine (301).

Step 3: After the test is completed, process the relevant test data, optimize the post-processing design plan, and finally complete the whole machine matching test.