A reliability test method for EGR system

Abstract

A reliability test method for an EGR system belongs to the technical field of engine testing. It can realize the assessment of the reliability of the EGR system; provide data support for the development of a high-reliability EGR system; and reduce the after-sales risk of the EGR system after mass production. It includes the following steps: S1. Assemble the engine; S2. Debug the test bench and perform a performance check on the EGR system to confirm that it works normally; S3. Perform a reliability test on the EGR system; if qualified, proceed to S4, if not qualified, terminate the test; S4. Perform a performance check on the EGR system; S5. Perform an EGR system reliability evaluation, if qualified, the test ends, if not qualified, proceed to S3. The present invention realizes the reliability test of the EGR system, provides data support for the development of a high-reliability EGR system, and has important guiding significance for reducing the failure rate of mass-produced EGR systems.

Description

Technical Field

[0001] The invention belongs to the technical field of engine testing, and in particular relates to a reliability testing method for an EGR system. Background Art

[0002] The EGR system is an important part of the engine. Its function is to guide the exhaust gas into the combustion chamber, thereby reducing the engine combustion peak, reducing NOx emissions and reducing fuel consumption. EGR failure will cause the engine exhaust to exceed the standard, and the power and economy will decrease, which will seriously affect the user's use. At present, there is no reliability test method for the EGR system. The reliability of the EGR system cannot be effectively monitored during the development stage, which brings after-sales risks to the mass production of the EGR system. Summary of the invention

[0003] The purpose of the present invention is to provide an EGR system reliability test method, which can realize the assessment of the reliability of the EGR system; provide data support for the development of a high-reliability EGR system; and reduce the after-sales risk of the EGR system after batch production.

[0004] The technical solution adopted by the present invention is: a reliability test method of an EGR system, comprising the following steps:

[0005] S1. Assemble the engine;

[0006] S2. Carry out test bench debugging and performance check on the EGR system to confirm that it is working properly;

[0007] S3. Conduct reliability test on the EGR system; if qualified, proceed to S4; if not qualified, terminate the test;

[0008] S4.EGR system performance check;

[0009] S5. Perform EGR system reliability evaluation. If qualified, the test is completed. If not, proceed to S3.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] The present invention realizes the reliability test of the EGR system, provides data support for the development of a high-reliability EGR system, and has important guiding significance for reducing the failure rate of mass-produced EGR systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a flow chart of the present invention;

[0013] Figure 2 It is a schematic diagram of the operating conditions of the reliability test of the present invention; DETAILED DESCRIPTION

[0014] In order to better understand the purpose, structure and function of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings.

[0015] A reliability test method for an EGR system comprises the following steps:

[0016] S1. Assemble the engine;

[0017] S2. Carry out test bench debugging and performance check on the EGR system to confirm that it is working properly;

[0018] S3. Conduct reliability test on the EGR system; if qualified, proceed to S4; if not qualified, the EGR system has a serious fault and the test is terminated;

[0019] S4.EGR system performance check;

[0020] S5. Evaluate the reliability of the EGR system (check whether the EGR system components are damaged or leaking, and whether the functions are normal. The evaluation method is to pressurize and check whether there are leaks, use inca to control the EGR valve, and check whether the actions are synchronized). If qualified, the test is completed. If not, proceed to S3.

[0021] Wherein: S3 includes:

[0022] S31. Perform a universal characteristic test on the engine to obtain an EGR opening map, and find the engine operating conditions corresponding to EGR openings of 3%, 5%, 10%, 15%, 20%, 35%, 55%, 75%, and 95% from the EGR opening map.

[0023] S32. Select the working condition of the EGR system, and use the test bench to conduct a reliability test on the EGR system (see Table 1 for details). During the test, monitor the parameters such as the EGR opening and the EGR outlet temperature. If the test is qualified, proceed to the next step;

[0024] Table 1 Operation schedule for each working condition

[0025] Serial number EGR opening Current working condition duration (s) Working condition cumulative time (s) 1 3％ 55 55 2 Changing working conditions 5 60 3 15％ 55 115 4 Changing working conditions 5 120 5 5％ 55 175 6 Changing working conditions 5 180 7 35％ 55 235 8 Changing working conditions 5 240 9 10％ 55 295 10 Changing working conditions 5 300 11 55％ 55 355 12 Changing working conditions 5 360 13 75％ 55 415 14 Changing working conditions 5 420 15 95％ 55 475 16 Changing working conditions 5 480

[0026] S32. The engine runs for a total of 200 hours according to Table 1. If qualified, proceed to S4.

[0027] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A reliability test method for an EGR system, characterized in that: The following steps are involved: S1. Assemble the engine; S2. Carry out test bench debugging and performance check on the EGR system to confirm that it is working properly; S3. Perform reliability test on the EGR system; if qualified, proceed to S4, if not qualified, terminate the test; S31. Perform universal characteristic test on the engine; obtain EGR opening map table, and find engine operating conditions corresponding to EGR opening of 3%, 5%, 10%, 15%, 20%, 35%, 55%, 75%, 95% from the EGR opening map table; S32. Select the working condition of the EGR system, use the test bench to perform a reliability test on the EGR system, and if it is qualified, proceed to the next step; monitor the EGR opening and EGR outlet temperature parameters during the test; S32. The engine has been running for 200 hours cumulatively. If qualified, proceed to S4; S4.EGR system performance check; S5. Perform EGR system reliability evaluation. If qualified, the test is completed. If not, proceed to S3.

2. The reliability test method of an EGR system according to claim 1, characterized in that: In S5, the reliability evaluation of the EGR system includes checking whether the EGR system components are damaged or leaking, and whether the functions are normal. The evaluation method is to pressurize to check whether there is leakage, use inca to control the EGR valve, and check whether the actions are synchronized.

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