A durability test method for diesel engine exhaust throttle valve

Abstract

The present invention belongs to the technical field of exhaust throttle valves and discloses a method for durability testing of diesel engine exhaust throttle valves, comprising: determining whether the diesel engine's overall performance indicators, thermal management indicators, and exhaust braking indicators meet durability test requirements; controlling the diesel engine to perform the test according to a cyclic program; completing the cyclic test when the diesel engine performs the cyclic program a set number of times; detecting whether the overall inspection indicators of the diesel engine that has completed the cyclic test meet overall evaluation standards; and disassembling the diesel engine that has completed the cyclic test to detect whether the valve body inspection indicators of the exhaust throttle valve meet valve body evaluation standards. The diesel engine exhaust throttle valve durability testing method of the present invention is based on a diesel engine bench durability test and covers the thermal management and exhaust braking operating conditions of the exhaust throttle valve. It can more accurately assess the durability of the exhaust throttle valve and minimize user risks.

Description

Technical Field

[0001] The invention relates to the technical field of exhaust throttle valves, and in particular to a durability test method for exhaust throttle valves of diesel engines. Background Art

[0002] In the field of diesel engines, in order to reduce emissions, most OEMs have adopted the DOC+DPF+SCR technology route to meet emission requirements. For DPF, when the carbon load reaches a certain amount, active regeneration is required for removal. For SCR, it needs to reach a certain temperature before achieving ideal conversion efficiency. The exhaust throttle valve is a key component on the diesel engine. First, in post-processing regeneration and emission control, the exhaust throttle valve plays the function of increasing and maintaining exhaust temperature. Second, according to the national motor vehicle safety operation regulations, auxiliary braking configuration requirements are set for various types of commercial vehicles. For this purpose, the exhaust brake butterfly valve is usually installed to achieve the exhaust brake function. Both of the above functional requirements can be achieved by the electronically controlled exhaust throttle valve. Therefore, the frequency of use and the severity of the working conditions of the exhaust throttle valve have greatly increased, and it needs to be tested for durability. Summary of the Invention

[0003] The purpose of the present invention is to provide a durability test method for an exhaust throttle valve of a diesel engine, which can perform durability testing according to the actual working conditions of the diesel engine.

[0004] To achieve this object, the present invention adopts the following technical solutions:

[0005] A diesel engine exhaust throttle valve durability test method, comprising:

[0006] Step 1: Ensure that the diesel engine's overall performance indicators, thermal management indicators, and exhaust brake indicators meet the durability test requirements;

[0007] Step 2: Control the diesel engine to perform the test according to the cycle program;

[0008] Step 3: When the diesel engine performs the cycle program for the number of times it reaches the set number of cycles, the cycle test is completed;

[0009] Step 4: Check whether the complete engine test indicators of the diesel engine that has completed the cycle test meet the complete engine evaluation standards;

[0010] Step 5: Disassemble the diesel engine that has completed the cycle test and check whether the valve body inspection index of the exhaust throttle valve meets the valve body evaluation standard.

[0011] Preferably, the overall machine performance indicators include power, torque and specific fuel consumption at each operating point.

[0012] Preferably, the thermal management indicators include the temperature, exhaust pressure and opening value of the exhaust throttle valve at each operating point.

[0013] Preferably, the exhaust brake index includes exhaust brake power, exhaust back pressure and exhaust throttle valve opening at various speeds.

[0014] Preferably, the cycle program includes multiple working conditions set in a cycle.

[0015] Preferably, the cycle program includes 11 working conditions, namely W1, W2, W3, W4, W5, W6, W7, W8, W9, W10 and W11, which are set in a cycle. When performing a cycle program, the running time of the W1 working condition is t1, the running time of the W2 working condition is t2, the running time of the W3 working condition is t3, the running time of the W4 working condition is t4, the running time of the W5 working condition is t5, the running time of the W6 working condition is t6, the running time of the W7 working condition is t7, the running time of the W8 working condition is t8, the running time of the W9 working condition is t9, the running time of the W10 working condition is t10, and the running time of the W11 working condition is t11;

[0016] In the W1, W2, W3, W4, W9, W10 and W11 operating conditions, the diesel engine does not activate the exhaust brake, and in the W5, W6, W7 and W8 operating conditions, the diesel engine activates the exhaust brake;

[0017] Under the W1 working condition, the speed of the diesel engine is N1; under the W2 working condition, the speed of the diesel engine is N2; under the W3 working condition, the speed of the diesel engine is N3; under the W4 working condition, the speed of the diesel engine is N4; under the W5 working condition, the speed of the diesel engine is N4; under the W6 working condition, the speed of the diesel engine is N5; under the W7 working condition, the speed of the diesel engine is N6; under the W8 working condition, the speed of the diesel engine is N7; under the W9 working condition, the speed of the diesel engine is is N4. Under W10 working condition, the speed of the diesel engine is N3. Under W11 working condition, the speed of the diesel engine is N2. Among them, N1<N2<N3<N7, N4<N5<N6, N1 is the engine idle speed, N2 is the lowest speed in the engine maximum torque speed range, N3=N2+(100~300), N7 is the engine rated speed, N4 is the common average speed of exhaust brake, N5 is the common maximum speed of exhaust brake, and N6 is the maximum allowable speed of exhaust brake;

[0018] Under W1 working condition, the load of the diesel engine is T1; under W2 working condition, the load of the diesel engine is T2; under W3 working condition, the load of the diesel engine is T3; under W4 working condition, the load of the diesel engine is T2; under W5 working condition, the load of the diesel engine is T4; under W6 working condition, the load of the diesel engine is T4; under W7 working condition, the load of the diesel engine is T4; under W8 working condition, the load of the diesel engine is T4; under W9 working condition, the load of the diesel engine is T4. The load of the engine is T2. Under the W10 working condition, the load of the diesel engine is T3. Under the W11 working condition, the load of the diesel engine is T2. Among them, T4=0, T1≤T3<T2, T1 is the load when the valve opening of the exhaust throttle valve is the largest under the corresponding working speed, and the value range is 10%-30%, T2 has a value range of 80%-100%, and T3 is the load when the valve opening of the exhaust throttle valve is the largest under the corresponding working speed, and the value range is 10%-50%.

[0019] Preferably, in the cyclic program, the operating times of a total of 11 working conditions, namely W1, W2, W3, W4, W5, W6, W7, W8, W9, W10 and W11, are equal.

[0020] Preferably, within the life target, the number of times the exhaust throttle valve is opened is counted in the actual operation data of the entire vehicle, and the operating condition where the valve opening is greater than 70% is extracted as the cycle setting number.

[0021] Preferably, the whole machine evaluation criteria include the difference between the whole machine detection parameters and the whole machine standard values ​​being within a first set range, and the whole machine detection parameters include maximum power, maximum torque, braking power and exhaust throttle valve opening.

[0022] Preferably, the valve body evaluation criteria include a difference between a valve body detection parameter and a valve body standard value within a second set range, and the valve body detection parameters include internal leakage, external leakage, friction pair wear and response speed.

[0023] Beneficial effects of the present invention:

[0024] The diesel engine exhaust throttle valve durability test method of the present invention is based on the diesel engine bench durability test, which can more accurately assess the durability of the exhaust throttle valve and minimize the user's use risk. The method covers the thermal management and exhaust braking conditions of the exhaust throttle valve, and reasonably selects the working conditions for cyclic verification to achieve the shortest verification time and complete the durability evaluation. The evaluation content most directly reflects whether the valve has failed, and the method is simple and easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a flow chart of a diesel engine exhaust throttle valve durability test method according to an embodiment of the present invention;

[0026] Figure 2 4 is a flow chart of the loop program described in an embodiment of the present invention. DETAILED DESCRIPTION

[0027] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar components or components having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, but are not to be construed as limiting the present invention.

[0028] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed or detachable connections, mechanical or electrical connections, direct or indirect connections through an intermediate medium, and internal communication between two elements or interaction between two elements. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0029] In the description of the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in contact with the second feature through another feature between them instead of being in direct contact. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0030] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0031] The present invention provides a diesel engine exhaust throttle valve durability test method, comprising the following steps:

[0032] Step 1: Determine whether the overall performance indicators, thermal management indicators and exhaust brake indicators of the diesel engine meet the endurance test requirements; Step 2: Control the diesel engine to perform the test according to the cycle program; Step 3: The cycle test is completed when the number of times the diesel engine performs the cycle program reaches the set number of cycles; Step 4: Check whether the overall inspection indicators of the diesel engine that has completed the cycle test meet the overall evaluation standards; Step 5: Disassemble the diesel engine that has completed the cycle test and check whether the valve body inspection indicators of the exhaust throttle valve meet the valve body evaluation standards.

[0033] In the present invention, when conducting durability testing, the test is carried out on a diesel engine, taking into account the performance indicators of the entire machine, thermal management indicators and exhaust brake indicators, so as to reflect the actual operating status of the product, realize a more reliable whole-machine durability test of the exhaust throttle valve, and provide a basis for R&D to discover product defects in advance.

[0034] like Figure 1 As shown, the steps of the diesel engine exhaust throttle valve durability test method of the present invention are described in detail below:

[0035] S1. Ensure that the diesel engine's overall performance indicators, thermal management indicators, and exhaust brake indicators meet the durability test requirements.

[0036] In this step, it is necessary to confirm that the calibration of the diesel engine has been completed, and to detect and confirm the overall performance indicators, thermal management indicators and exhaust brake indicators of the diesel engine, to ensure that the parts related to the above indicators are in the final state. When the values ​​of each indicator are normal, the durability test requirements can be met.

[0037] Specifically, during the test, the diesel engine operates at various preset operating points. The overall performance indicators include the power, torque and specific fuel consumption at each operating point. The thermal management indicators include the temperature, exhaust pressure and exhaust throttle valve opening value at each operating point. The exhaust braking indicators include the exhaust braking power, exhaust back pressure and exhaust throttle valve opening at each speed.

[0038] S2. Control the diesel engine to conduct the test according to the cycle procedure.

[0039] In this step, the cycle program includes multiple operating conditions set in the cycle, and the diesel engine is controlled to run under the multiple operating conditions of the cycle program in sequence, and then the cycle program is performed once.

[0040] like Figure 2 As shown, in this embodiment, the cycle program includes 11 working conditions, namely W1, W2, W3, W4, W5, W6, W7, W8, W9, W10 and W11, which are set in a cycle. When performing a cycle program, the operating time of the W1 working condition is t1, the operating time of the W2 working condition is t2, the operating time of the W3 working condition is t3, the operating time of the W4 working condition is t4, the operating time of the W5 working condition is t5, the operating time of the W6 working condition is t6, the operating time of the W7 working condition is t7, the operating time of the W8 working condition is t8, the operating time of the W9 working condition is t9, the operating time of the W10 working condition is t10, and the operating time of the W11 working condition is t11.

[0041] Specifically, under the W1, W2, W3, W4, W9, W10 and W11 operating conditions, the diesel engine does not activate the exhaust brake, and under the W5, W6, W7 and W8 operating conditions, the diesel engine activates the exhaust brake.

[0042] Under the W1 working condition, the speed of the diesel engine is N1; under the W2 working condition, the speed of the diesel engine is N2; under the W3 working condition, the speed of the diesel engine is N3; under the W4 working condition, the speed of the diesel engine is N4; under the W5 working condition, the speed of the diesel engine is N4; under the W6 working condition, the speed of the diesel engine is N5; under the W7 working condition, the speed of the diesel engine is N6; under the W8 working condition, the speed of the diesel engine is N7; under the W9 working condition, the speed of the diesel engine is N4; under the W10 working condition, the speed of the diesel engine is N1. The speed is N3. Under the W11 working condition, the speed of the diesel engine is N2, among which N1<N2<N3<N7, N4<N5<N6, N1 is the engine idle speed, N2 is the lowest speed in the engine maximum torque speed range, N3=N2+(100~300), N7 is the engine rated speed, N4 is the commonly used average speed of exhaust brake, N5 is the commonly used maximum speed of exhaust brake, N6 is the maximum allowable speed of exhaust brake, N4 and N5 are the average value and maximum value of the most commonly used speed range obtained after statistics of user usage conditions.

[0043] Under W1 working condition, the load of the diesel engine is T1; under W2 working condition, the load of the diesel engine is T2; under W3 working condition, the load of the diesel engine is T3; under W4 working condition, the load of the diesel engine is T2; under W5 working condition, the load of the diesel engine is T4; under W6 working condition, the load of the diesel engine is T4; under W7 working condition, the load of the diesel engine is T4; under W8 working condition, the load of the diesel engine is T4; under W9 working condition, the load of the diesel engine is T4. The load of the engine is T2. Under the W10 working condition, the load of the diesel engine is T3. Under the W11 working condition, the load of the diesel engine is T2. Among them, T4=0, T1≤T3<T2, T1 is the load when the valve opening of the exhaust throttle valve is the largest under the corresponding working speed, and the value range is 10%-30%, T2 has a value range of 80%-100%, and T3 is the load when the valve opening of the exhaust throttle valve is the largest under the corresponding working speed, and the value range is 10%-50%.

[0044] More specifically, in the cyclic program, the operating times of a total of 11 working conditions, namely W1, W2, W3, W4, W5, W6, W7, W8, W9, W10 and W11, are equal. In this embodiment, it is set as t1=t2=t3=t4=t5=t6=t7=t8=t9=t10=t11>5s. In other embodiments, t1, t2, t3, t4, t5, t6, t7, t8, t9, t10 and t11 can also be set to be unequal, depending on the specific circumstances.

[0045] S3. When the diesel engine performs the cycle program for the number of times reaching the cycle setting number, the cycle test is completed.

[0046] In this step, according to the life target of the specific diesel engine model, within the life target, the number of times the exhaust throttle valve is opened in the actual operating data of the vehicle is counted, and the operating conditions where the valve opening is greater than 70% are extracted and counted as the cycle setting number.

[0047] S4. Check whether the whole-machine test indicators of the diesel engine that has completed the cycle test meet the whole-machine evaluation standards.

[0048] In this step, the whole machine evaluation standard includes the difference between the whole machine detection parameters and the whole machine standard value within a first set range, and the whole machine detection parameters include maximum power, maximum torque, braking power and exhaust throttle valve opening.

[0049] In this embodiment, the first setting range is ±(3-10)% of the standard value of the whole machine.

[0050] Specifically, if the whole machine evaluation standard is met, the next step is performed; if not, it is determined that the exhaust throttle valve does not meet the durability test requirements.

[0051] S5. Disassemble the diesel engine that has completed the cycle test and inspect the exhaust throttle valve to see whether its valve body inspection indicators meet the valve body evaluation standards.

[0052] In this step, the valve body evaluation criteria include the difference between the valve body detection parameters and the valve body standard values ​​being within a second set range, and the valve body detection parameters include internal leakage, external leakage, friction pair wear and response speed.

[0053] The second setting range is set according to specific circumstances and is not limited here.

[0054] Specifically, if the valve body evaluation standard is satisfied, it is determined that the exhaust throttle valve meets the durability test requirement; if not, it is determined that the exhaust throttle valve does not meet the durability test requirement.

[0055] The diesel engine exhaust throttle valve durability test method of the present invention is based on the diesel engine bench durability test, which can more accurately assess the durability of the exhaust throttle valve and minimize the user's use risk. The method covers the thermal management and exhaust braking conditions of the exhaust throttle valve, and reasonably selects the working conditions for cyclic verification to achieve the shortest verification time and complete the durability evaluation. The evaluation content most directly reflects whether the valve has failed, and the method is simple and easy to operate.

[0056] The diesel engine exhaust throttle valve durability test method proposed in this invention includes five specific steps. Furthermore, a test prototype can be added for verification after full vehicle calibration as needed to meet the durability verification requirements of different development stages. The cycle program includes 11 operating conditions, and additional operating modes can be adopted based on actual needs. The proportion of each operating condition can vary, but at least thermal management and exhaust braking conditions must be included. The proposed post-test evaluation requirements can also include other key indicators such as oil consumption and air leakage, depending on specific requirements.

[0057] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A diesel engine exhaust throttle valve durability test method, characterized in that: include: Step 1: Ensure that the diesel engine's overall performance indicators, thermal management indicators, and exhaust brake indicators meet the durability test requirements; Step 2: Control the diesel engine to perform the test according to the cycle program; Step 3: When the diesel engine performs the cycle program for the number of times it reaches the set number of cycles, the cycle test is completed; Step 4: Check whether the complete engine test indicators of the diesel engine that has completed the cycle test meet the complete engine evaluation standards; Step 5: Disassemble the diesel engine that has completed the cycle test and test whether the valve body test indicators of the exhaust throttle valve meet the valve body evaluation standards; The cycle program includes 11 working conditions, namely W1, W2, W3, W4, W5, W6, W7, W8, W9, W10 and W11, which are set in the cycle. When the cycle program is performed once, the running time of the W1 working condition is t1, the running time of the W2 working condition is t2, the running time of the W3 working condition is t3, the running time of the W4 working condition is t4, the running time of the W5 working condition is t5, the running time of the W6 working condition is t6, the running time of the W7 working condition is t7, the running time of the W8 working condition is t8, the running time of the W9 working condition is t9, the running time of the W10 working condition is t10, and the running time of the W11 working condition is t11; In the W1, W2, W3, W4, W9, W10 and W11 operating conditions, the diesel engine does not activate the exhaust brake, and in the W5, W6, W7 and W8 operating conditions, the diesel engine activates the exhaust brake; Under the W1 working condition, the speed of the diesel engine is N1; under the W2 working condition, the speed of the diesel engine is N2; under the W3 working condition, the speed of the diesel engine is N3; under the W4 working condition, the speed of the diesel engine is N4; under the W5 working condition, the speed of the diesel engine is N4; under the W6 working condition, the speed of the diesel engine is N5; under the W7 working condition, the speed of the diesel engine is N6; under the W8 working condition, the speed of the diesel engine is N7; under the W9 working condition, the speed of the diesel engine is is N4. Under W10 working condition, the speed of the diesel engine is N3. Under W11 working condition, the speed of the diesel engine is N2. Among them, N1<N2<N3<N7, N4<N5<N6, N1 is the engine idle speed, N2 is the lowest speed in the engine maximum torque speed range, N3=N2+(100~300), N7 is the engine rated speed, N4 is the common average speed of exhaust brake, N5 is the common maximum speed of exhaust brake, and N6 is the maximum allowable speed of exhaust brake. Under W1 working condition, the load of the diesel engine is T1; under W2 working condition, the load of the diesel engine is T2; under W3 working condition, the load of the diesel engine is T3; under W4 working condition, the load of the diesel engine is T2; under W5 working condition, the load of the diesel engine is T4; under W6 working condition, the load of the diesel engine is T4; under W7 working condition, the load of the diesel engine is T4; under W8 working condition, the load of the diesel engine is T4; under W9 working condition, the load of the diesel engine is T4. The load of the engine is T2. Under the W10 working condition, the load of the diesel engine is T3. Under the W11 working condition, the load of the diesel engine is T2. Among them, T4=0, T1≤T3<T2, T1 is the load when the valve opening of the exhaust throttle valve is the largest under the corresponding working speed, and the value range is 10%-30%. The value range of T2 is 80%-100%. T3 is the load when the valve opening of the exhaust throttle valve is the largest under the corresponding working speed, and the value range is 10%-50%.

2. The diesel engine exhaust throttle valve durability test method according to claim 1, characterized in that: The overall machine performance indicators include power, torque and specific fuel consumption at each operating point.

3. The diesel engine exhaust throttle valve durability test method according to claim 1, characterized in that: Thermal management indicators include the temperature, exhaust pressure and opening value of the exhaust throttle valve at each operating point.

4. The diesel engine exhaust throttle valve durability test method according to claim 1, characterized in that: Exhaust brake indicators include exhaust brake power, exhaust back pressure and exhaust throttle valve opening at various speeds.

5. The diesel engine exhaust throttle valve durability test method according to claim 1, characterized in that: In the cyclic program, the running time of a total of 11 working conditions, including W1, W2, W3, W4, W5, W6, W7, W8, W9, W10 and W11, is equal.

6. The diesel engine exhaust throttle valve durability test method according to claim 1, characterized in that: Within the life target, the number of times the exhaust throttle valve is opened in the actual operating data of the vehicle is counted, and the operating conditions where the valve opening is greater than 70% are extracted and counted as the cycle setting number.

7. The diesel engine exhaust throttle valve durability test method according to claim 1, characterized in that: The whole machine evaluation standard includes the difference between the whole machine detection parameters and the whole machine standard values ​​within a first set range, and the whole machine detection parameters include maximum power, maximum torque, braking power and exhaust throttle valve opening.

8. The diesel engine exhaust throttle valve durability test method according to claim 1, characterized in that: The valve body evaluation criteria include the difference between the valve body detection parameters and the valve body standard values ​​within a second set range, and the valve body detection parameters include internal leakage, external leakage, friction pair wear and response speed.

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