CN117167659A - Engine bench exhaust pipeline structure and testing method - Google Patents

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

An engine bench exhaust pipeline structure and testing method

Technical field

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

Background technique

As the requirements for low emissions from internal combustion engines continue to become stricter, in addition to upgrading the engine body, an exhaust gas purification device - engine aftertreatment - must also be added. The current mainstream non-road National IV engine after-treatment technology route is oxidation catalytic converter DOC (Diesel Oxidation Catalyst) + particle trap DPF (Diesel Particulate Filter) + selective catalytic reduction technology SCR (Selective Catalytic Reduction). So the quality of an engine after-treatment design requires continuous testing of the engine and after-treatment devices to complete the matching of the entire machine.

For example, the publication number is CN116066217A, which provides a vehicle exhaust particle control method and related devices. The method includes: obtaining the current operating condition data of the target vehicle; determining the corresponding particulate matter control strategy based on the current operating condition data; The control strategy controls the opening and closing degree of the first control valve and the second control valve. The first control valve is used to control the opening and closing of the first exhaust pipe after the TWC of the target vehicle, and the second control valve is used to control the opening and closing of the first exhaust pipe after the TWC. Opening and closing of the second exhaust pipe, a GPF is installed in the second exhaust pipe, and the GPF is used for particle capture. Through the above solution, the amount of particulate matter in vehicle exhaust can be effectively controlled under various working conditions.

The above-mentioned system bypass pipeline method can effectively control the amount of particulate matter in vehicle exhaust gas. It can be further improved during the engine bench calibration test development stage. In the development process of after-treatment products, the method of serial connection to the exhaust pipe of the engine bench for testing is more commonly used. In the early stage of product development, it is usually necessary to design and modify the exhaust pipeline of the engine bench many times. Modifying the exhaust pipeline for each post-processing technology route design will not only greatly increase the research and development costs, but also consume a lot of time. Helps shorten the product development cycle.

In summary, there is an urgent need for an engine bench test pipeline structure and method that is convenient, time-saving, has high test efficiency, low development cost, is easy to disassemble, and has strong test generalization.

Contents of the invention

The purpose of the present invention is to provide an engine bench exhaust pipeline structure and a testing method to solve the current problems of high engine after-processing research and development costs and low testing efficiency.

In order to achieve the above object, the present invention provides the following technical solution: an engine bench exhaust pipeline structure and testing method; including a head exhaust connection pipeline, a tail exhaust connection pipeline, a pipeline switch control valve group and Post-treatment assembly pipeline, the exhaust connection 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 is equipped with the pipeline switch control valve group, the post-processing component pipeline includes DOC, DPF component pipeline and SCR component pipeline, the head exhaust connection pipeline and the tail section The exhaust connection pipelines are all equipped with first connection flanges, and the equidistant empty pipes are provided with second connection flanges at both ends. The outer walls of the post-processing components and the previous overall pipeline are all covered with thermal insulation layers. , the exhaust connection pipeline is connected to the engine exhaust manifold, the first bypass pipeline is connected to the DOC, DPF assembly pipeline and SCR assembly pipeline, and the second bypass pipeline is connected to the The DOC and DPF component pipelines are connected, the main exhaust pipeline is connected to the tail exhaust pipeline using equidistant empty pipes, the post-processing component pipeline is connected to the tail exhaust pipeline, and the pipeline switch control The valve group includes pipeline switch control valve one, pipeline switch control valve two, pipeline switch control valve three, pipeline switch control valve four, pipeline switch control valve five, and pipeline switch control valve six;

Preferably, the exhaust connection pipeline is equipped with a switch control valve, and the opening or closing of the control valve can simulate the selection of the main exhaust pipeline or the bypass pipeline;

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

Preferably, the first connecting flange and the second connecting flange cooperate;

Preferably, the pipeline in front of the post-processing component is affixed with a thermal insulation layer;

Preferably, the bypass line can actually test the aftertreatment exhaust resistance, and when using the main exhaust line, the engine exhaust back pressure can be simulated through the rear exhaust back pressure valve.

The invention also provides a testing method for the engine bench exhaust pipeline structure. The specific steps are as follows:

Step 1: The staff selects the appropriate after-treatment component configuration plan based on the actual technical parameters of the developed engine. 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 must be affixed with a thermal insulation layer ;

Step 2: When performing the original exhaust test of the engine, use the switch to control the valve group to close the first and second bypass pipes; when performing the engine rear exhaust test, use the switch to control the valve group to open the first or second bypass pipe according to the selection plan. route, and at the same time close the main exhaust pipeline, collect the exhaust resistance and other parameters of the actual after-treatment component, simulate it through the exhaust back pressure valve, and then conduct the original exhaust development test of the engine again.

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.

Beneficial effects of the present invention: The present invention achieves the effect of improving engine aftertreatment test efficiency by optimizing the bench exhaust pipeline structure, and uses pipeline switches to control valve groups to simulate exhaust pipelines under different aftertreatment component configuration schemes. The layout method makes the test more concise. It can avoid frequent replacement of staff and repeated disassembly and assembly, greatly reducing the preliminary test work, which is conducive to reducing research and development costs and shortening the development cycle.

Description of drawings

Figure 1 is a flow chart of a testing method for an engine bench exhaust pipeline according to the present invention.

Figure 2 is a schematic structural diagram of an engine bench exhaust pipeline structure according to the present invention.

Figure 3 is a schematic diagram of the structural layout of the exhaust pipeline of an engine stand according to the present invention.

201. First connecting flange; 202. First bypass pipeline; 203. Second bypass pipeline; 204. Main exhaust pipeline; 301. Engine; 302. Exhaust manifold; 303. Second connection Flange; 304, head exhaust connection pipeline; 305, pipeline switch control valve one; 306, pipeline switch control valve two; 307, pipeline switch control valve three; 308, DOC; 309, DPF; 310, SCR; 311, equidistant empty pipe; 312, pipeline switch control valve four; 313, pipeline switch control valve five; 314, pipeline switch control valve six; 315, tail exhaust connection pipeline; 316, exhaust back pressure valve.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

It should be noted that the words "front", "back", "left", "right", "upper" and "lower" used in the following description refer to the direction in Figure 1, and the words "inner" and "inner" "Outer" refers to the direction toward or away from the geometric center of a specific part, respectively.

Example 1:

As shown in Figures 1-3: the present invention provides an engine bench exhaust pipeline structure and testing method; including a head exhaust connection pipeline 304, a tail exhaust connection pipeline 315, and a pipeline switch control valve group and after-treatment component pipelines. 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 The bypass pipeline 202 and the second bypass pipeline 203 are both equipped with the pipeline switch control valve group. The post-processing component pipeline includes DOC308, DPF309 component pipeline and SCR310 component pipeline. The head The exhaust connection pipe 304 and the tail exhaust connection pipe 315 are both provided with first connection flanges 201, and the equidistant empty pipe 311 is provided with second connection flanges 303 at both ends. The post-processing assembly and the previous The outer walls of the entire pipeline are covered with thermal insulation layers, the exhaust connection pipeline is connected to the exhaust manifold 302 of the engine 301, and the first bypass pipeline 202 is connected to the DOC308, DPF309 component pipelines and SCR310 The component pipelines are connected, the second bypass pipeline 203 is connected to the DOC308 and DPF309 component pipelines, the main exhaust pipeline 204 is connected to the tail exhaust pipeline using an equidistant empty pipe 311, and the rear The processing component pipeline is connected to the tail exhaust pipeline. The pipeline switch control valve group includes pipeline switch control valve one 305, pipeline switch control valve two 306, pipeline switch control valve three 307, and pipeline switch control valve Four 312, pipeline switch control valve five 313, pipeline switch control valve six 314;

In the present invention, a switch control valve is provided inside the exhaust connection pipeline. The opening or closing of the control valve can simulate the use of the main exhaust pipeline 204 or the bypass pipeline, thereby realizing exhaust under different post-processing configuration schemes. Test the layout of the pipeline;

In the present invention, the pipeline switch control valve group is a one-way valve, which can prevent the backflow of exhaust gas;

In the present invention, the first connecting flange 201 and the second connecting flange 303 cooperate, and the connecting flange method can maintain the stability and sealing of the pipeline connection;

In the present invention, the pipeline in front of the post-processing component is affixed with a thermal insulation layer to prevent heat loss;

The bypass pipeline in the present invention can actually test the after-treatment exhaust resistance, and when using the main exhaust pipeline 204, the exhaust back pressure of the engine 301 can be simulated through the rear exhaust back pressure valve 316.

With the after-treatment component installed, close the switch control valve group of the head exhaust pipe and the second bypass pipe 203, and test the actual exhaust resistance of the engine 301 after-treatment component and other related post-processing test data for storage and processing. .

Then close the switch control valve group of the head exhaust pipeline and the first bypass pipeline 202, and test the actual exhaust resistance of the engine 301 after-treatment component and other relevant post-processing test data for storage and processing.

The segmented test post-processing can help the staff accurately analyze the actual situation of each development sample. After the test is completed, based on the analysis of the data results, an optimized post-processing improvement design plan is proposed, and the matching test of the post-processing and the complete machine is finally completed.

Example 2:

When the after-treatment component is not installed, the switch control valve group of the bypass line is closed, the switch control valve group of the main exhaust line 204 is opened, and at the same time, the exhaust back pressure of the engine 301 is realized through the exhaust back pressure valve 316 Simulation test, complete the original row development test of engine 301.

The present invention and its embodiments have been described above. This description is not limiting. What is shown in the drawings is only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if a person of ordinary skill in the art is inspired by the invention and without departing from the spirit of the invention, can devise structural methods and embodiments similar to the technical solution without inventiveness, they shall all fall within the protection scope of the invention.

Claims (7)

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.