A method for evaluating the reliability of a metering unit of a high-pressure oil pump of a motor vehicle

Abstract

The application provides a method for evaluating reliability of a metering unit of a high-pressure oil pump of an automobile. In an initial sample stage of engine development, vibration test data are obtained through specific working conditions and specific data processing methods, the test data are compared with database data, long-term operation reliability of a pin of the metering unit of the oil pump is evaluated, corresponding measures are taken according to the evaluation result, risks can be identified in advance through the evaluation, and project development risks, cycle and cost are reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of automobile oil pump, in particular to a method for evaluating reliability of a metering unit of an automobile high-pressure oil pump. BACKGROUND

[0002] The metering unit of the high-pressure oil pump of an automobile engine is one of the key components in the fuel system of a diesel or gasoline engine. Its main function is to accurately control and regulate the amount of fuel entering the high-pressure oil pump according to the working condition requirements of the engine, so as to ensure that the engine can obtain an appropriate amount of fuel for efficient combustion. The reliability of the metering unit plays an important role in stabilizing the oil rail pressure of the engine and ensuring normal operation of the engine. The existing evaluation method only evaluates the reliability of the oil pump metering unit after durability by destructive disassembly. If the reliability is not qualified, the project needs to be improved and verified again, which is not friendly to the project development cycle and risk control. SUMMARY

[0003] In view of the defects in the prior art, the purpose of the present application is to provide a method for evaluating the reliability of a metering unit of an automobile high-pressure oil pump, which can identify risks in advance and reduce project development risks.

[0004] To achieve the above technical effects, the present application adopts the following technical solutions:

[0005] A method for evaluating the reliability of a metering unit of an automobile high-pressure oil pump, comprising the following steps:

[0006] Step S1. Perform CAE modal analysis and dynamic stiffness analysis on the surrounding structure of the high-pressure oil pump metering unit. According to the modal vibration mode diagram, dynamic stiffness, etc., the point with the maximum displacement is obtained, and the point is taken as the vibration measurement point;

[0007] Step S2. Vibration test: paste a vibration sensor on the vibration measurement point. Under the condition of 100% load, pull up the engine from the lowest speed to the highest speed, and collect vibration data at the same time. Select data between 0.8*maximum vibration data and maximum vibration data for processing, and take the processed data as the measured vibration value;

[0008] Step S3. Database establishment: collect and summarize the vibration data values in past projects, as well as the corresponding durability time / mileage, pin wear rating, and open circuit failure under different vibration data values as database data;

[0009] Step S4. Reliability evaluation comparison between the measured vibration value and the data in the database; compare the measured vibration value of the oil pump metering unit obtained in step S2 with the vibration data in the database, calculate the corresponding durability time or mileage of the region where the measured vibration value is located, and provide a basis for reliability evaluation;

[0010] Step S5. Improvement or optimization is made for the evaluated risk.

[0011] Preferably, in step S1, the high-pressure oil pump metering unit peripheral structure includes the cylinder block, generator, steering pump, air conditioning compressor of the high-pressure oil pump metering unit periphery.

[0012] Preferably, in step S1, the vibration measuring point is located at the connector position and the mounting surface position.

[0013] Preferably, in step S2, after the vibration sensor is attached to the vibration measuring point, the step of connecting the engine speed acquisition device, vibration acquisition box, power supply wire, network cable, computer, and test computer channel and sensitivity is further included.

[0014] Compared with the prior art, the present application has the following beneficial effects:

[0015] The method for evaluating the reliability of the high-pressure oil pump metering unit of the automobile provided by the present application can evaluate the long-term operation reliability of the oil pump metering unit pin in the initial sample stage of engine development through vibration test data obtained by specific working conditions and specific data processing methods, and take corresponding measures according to the evaluation results. The risk can be identified in advance through evaluation, and the project development risk, cycle, and cost can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0016] Other features, objects, and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments with reference to the following drawings:

[0017] Figure 1 The step flowchart of the method for evaluating the reliability of the high-pressure oil pump metering unit of the automobile described in the embodiments;

[0018] Figure 2 The flowchart of the method for evaluating the reliability of the high-pressure oil pump metering unit of the automobile described in the embodiments. DETAILED DESCRIPTION

[0019] In order to make the purposes, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, but not all embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of embodiments of the application provided in the accompanying drawings is not intended to limit the scope of the application claimed, but merely represents selected embodiments of the application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the scope of protection of the present application.

[0021] As shown in Figure 1 , 2 The present embodiment provides a method for evaluating the reliability of the metering unit of a high-pressure oil pump of a vehicle. The method mainly obtains vibration test data through specific working conditions, specific sensor pasting methods, and specific data processing methods at the initial stage of project development sample, establishes a database, compares the database data, evaluates the long-term running reliability of the oil pump metering unit according to the data results, and takes corresponding measures according to the evaluation results to reduce the project development risk, cycle, and cost. It mainly includes the following steps:

[0022] Step S1. Oil pump CAE modal analysis: According to the vibration displacement maximum point obtained by the oil pump CAE modal analysis, the point is taken as the vibration measuring point; specifically including the following steps:

[0023] a. Collect the 3D data of the high-pressure oil pump metering unit, the surrounding cylinder, the generator, the steering pump, the air conditioner compressor, and the materials and weights;

[0024] b. Modal analysis and dynamic stiffness analysis of the high-pressure oil pump metering unit surrounding structure;

[0025] c. According to the modal vibration mode diagram, dynamic stiffness, etc. Get the point with the maximum displacement, and take this point as the vibration measuring point. This point is usually located at the connector position and the mounting surface position;

[0026] Step S2. Vibration test: as shown in Figure 2 According to the structure of the metering unit, select the appropriate vibration sensor and paste it on the vibration measuring point, and set the engine specific working condition for testing. Specifically including the following steps:

[0027] a) Select a vibration sensor of appropriate size, and paste the vibration sensor on the vibration test measuring point at the oil pump connector port, mounting surface, etc.

[0028] b) Device connection: collect the engine speed signal, sensor electrical connection, power supply, network cable, etc.

[0029] c) Test computer channel, sensitivity, etc. Settings;

[0030] d) Special working condition setting, vibration collection: under 100% load, pull up the engine from the lowest speed to the highest speed, and collect vibration data at the same time; wherein 100% load refers to the case where the accelerator is depressed to the bottom.

[0031] e) Data processing: select the vibration data under special working conditions, select the data between 0.8*maximum vibration value-maximum vibration value for processing, and take the processed data as the new project measured vibration value.

[0032] Step S3. Database establishment: collect and summarize the vibration data values in special working conditions in the past projects, and the corresponding durability time / mileage, pin wear rating, open circuit failure or not as the database.

[0033] Step S4. Compare the measured vibration value with the data in the database for reliability evaluation; compare the measured vibration value of the oil pump metering unit with the database data / vibration limit value for reliability comparison, calculate the corresponding durability time or mileage of the region where the measured vibration value is located, and then provide basis for reliability evaluation.

[0034] Step S5. Improve or optimize the evaluated risk.

[0035] The specific embodiments of the present application are described above, and through the above description, relevant personnel can make various changes and modifications without deviating from the technical idea of the present application.

Claims

1. A method for evaluating the reliability of a metering unit in an automotive high-pressure oil pump, characterized in that, Includes the following steps: Step S1. Perform CAE modal analysis and dynamic stiffness analysis on the surrounding structure of the high-pressure oil pump metering unit. Based on the modal vibration diagram and dynamic stiffness results, obtain the point with the largest displacement and use this point as the vibration measurement point. The surrounding structure of the high-pressure oil pump metering unit includes the cylinder block, generator, steering pump, and air conditioning compressor around the high-pressure oil pump metering unit. Step S2. Vibration test: Attach vibration sensors to the vibration measurement points, connect the engine speed acquisition device, vibration acquisition box, power cord, network cable and computer, test the computer channel and sensitivity, and under 100% load, increase the engine speed from the lowest speed to the highest speed while collecting vibration data. Select the data between 0.8 * the maximum vibration data value and the maximum vibration data value for processing, and use the processed data as the measured vibration value. Step S3. Database establishment: Collect and summarize vibration data values ​​from past projects, as well as the corresponding durability time / mileage, pin wear rating, and open circuit failure status under different vibration data values ​​as database data; Step S4. Compare the measured vibration values ​​with the data in the database for reliability assessment; compare the measured vibration values ​​of the oil pump metering unit obtained in step S2 with the vibration data in the database to estimate the durability time or mileage corresponding to the area where the measured vibration values ​​are located, and thus provide a basis for its reliability assessment. Step S5. Improve or optimize the risks assessed.

2. The method for evaluating the reliability of a high-pressure oil pump metering unit in an automobile according to claim 1, characterized in that, In step S1, the vibration measuring point is located at the insertion position and the mounting surface position.

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