Method for obtaining universal two-dimensional flow characteristic table of fuel regulator

Abstract

The application discloses a kind of fuel regulator general two-dimensional flow characteristic table acquisition methods, comprising the following steps: S2, the flow characteristics of different opening under the speed of N fuel pump regulator is averaged to obtain general two-dimensional flow characteristic table;S3, based on general two-dimensional flow characteristic table, select several typical speed points for comparison, calculate the difference between the two-dimensional flow characteristic table data of N fuel pump regulator and general two-dimensional flow characteristic table;S4, the data of engine field test is analyzed, the flow range of engine actual demand under each speed point is determined, and the oil needle range of engine actual work is obtained in general two-dimensional flow characteristic table;S5, general two-dimensional flow characteristic table is carried out semi-physical interchangeability test, including functional performance test, high altitude simulation test and the like;S6, engine of different working hours, fuel pump regulator of different flow characteristics and different engine environment are selected to carry out bench verification test.

Description

Technical Field

[0001] This application relates to the field of aero-engine technology, and in particular, to a method for obtaining a general two-dimensional flow characteristic table of a fuel regulator. Background Technology

[0002] Convenient and efficient maintainability of aero engines is crucial for improving engine readiness and mission success, reducing maintenance manpower and other maintenance support resource requirements. Currently, many domestically developed CNC systems (including digital electronic controllers and fuel pump regulators, with the fuel pump regulator's actuator being a stepper motor) lack complete LRU interchangeability. Due to the difficulty in ensuring consistency in the fuel pump regulator's metering needle profile, high-precision step angle and step angle consistency, and the feedback accuracy of the non-contact resolver, the two-dimensional flow characteristic table of fuel pump regulators varies to some extent for each unit. Currently, before engine delivery, the two-dimensional flow characteristic table of the fuel pump regulator must be written into the control parameters of the digital electronic controller. When replacing the fuel pump regulator, the two-dimensional flow characteristic table of the new fuel pump regulator must be written into the control parameters of the digital electronic controller; when replacing the digital electronic controller, the two-dimensional flow characteristic table from the original controller's control parameters must be written into the new digital electronic controller.

[0003] It is evident that the current fuel pump regulators that use stepper motors as the metering needle actuators do not have universal two-dimensional flow characteristic tables. When the fuel pump regulator or digital electronic controller needs to be replaced in the field, the two-dimensional flow characteristic table in the controller's control parameters needs to be changed. It does not have true interchangeability without parameter adjustment, and the maintainability is generally poor. Furthermore, updating the electronic controller's control parameters in the field requires specialized tools, which increases the resource investment in field maintenance. Summary of the Invention

[0004] This application provides a method for obtaining a universal two-dimensional flow characteristic table for fuel regulators, in order to solve the technical problems that the existing two-dimensional flow characteristic tables for fuel regulators lack universality and that the resource input efficiency of field maintenance is low when replacing the two-dimensional flow characteristic tables.

[0005] The technical solution adopted in this application is as follows:

[0006] A method for obtaining a universal two-dimensional flow characteristic table for a fuel regulator includes the following steps:

[0007] S2. Based on the accumulated data of N fuel pump regulator samples and engine test data, the average value of the flow characteristics of the N fuel pump regulators at different openings under different speeds is calculated to obtain a general two-dimensional flow characteristic table.

[0008] S3. Based on the general two-dimensional flow characteristic table, select several typical speed points for comparison, and calculate the difference between the two-dimensional flow characteristic table data of N fuel pump regulators and the general two-dimensional flow characteristic table.

[0009] S4. Analyze the data from the engine field test to determine the actual flow range required by the engine at each speed point. Obtain the fuel needle range when the engine is actually working from the general two-dimensional flow characteristic table. Select some flow characteristic points when the engine is actually working. Combine the fuel needle range to check the flow characteristics of N fuel pump regulators. During the check, the steady-state error of fuel metering must meet the requirements of the technical agreement.

[0010] S5. Conduct semi-physical interchangeability tests on the general two-dimensional flow characteristic table, including functional performance tests, high-altitude simulation tests, and pull tests. If the start-up process, steady-state control error, and overshoot of acceleration and deceleration meet the requirements during the test, then the general two-dimensional flow characteristic table meets the requirements.

[0011] S6. Select engines with different operating hours, fuel pump regulators with different flow characteristics, and different engine environments to conduct bench verification tests. If the starting process, steady-state control error, and overshoot during acceleration and deceleration meet the requirements during the test, then the general two-dimensional flow characteristic table meets the requirements.

[0012] Furthermore, in step S3, the several typical speed points include: the initial fuel injection speed point, the slowest speed point, and the maximum speed point.

[0013] Furthermore, in step S3, the differences between the two-dimensional flow characteristic table data of the N fuel pump regulators and the general two-dimensional flow characteristic table include:

[0014] When the flow rate in the two-dimensional flow characteristic table of the fuel pump regulator is less than Mkg, the flow rate difference between the two-dimensional flow characteristic table of the fuel pump regulator and the general two-dimensional flow characteristic table is ±Xkg. When the flow rate in the two-dimensional flow characteristic table of the fuel pump regulator is greater than Mkg, the flow rate difference between the two-dimensional flow characteristic table of the fuel pump regulator and the general two-dimensional flow characteristic table is ±Ykg, where Y>X.

[0015] Furthermore, in step S4, when analyzing the data from the engine field test, the minimum and maximum flow rates at 10%, 20%, ... 100% of the operating speed are extracted.

[0016] Furthermore, step S5 specifically includes:

[0017] S51. Perform functional performance tests using a general two-dimensional flow characteristic table, mainly including starting performance, steady-state control, and acceleration / deceleration control. If the starting process, steady-state control error, and acceleration / deceleration overshoot meet the requirements, then the general two-dimensional flow characteristic table meets the requirements. The starting process meeting the requirements includes the starting time meeting the requirements and no hanging or overheating abnormalities.

[0018] Furthermore, step S5 specifically includes:

[0019] S52. Use a general two-dimensional flow characteristic table to conduct a high-altitude simulation test. Select several typical operating points within the engine's operating envelope to conduct functional performance tests and repeat the functional performance test. When the starting process, steady-state control error, and overshoot of acceleration and deceleration meet the requirements, the general two-dimensional flow characteristic table meets the requirements. The starting process meeting the requirements includes the starting time meeting the requirements and no suspension or overheating abnormalities. The several typical operating points include the initial fuel injection speed point, the ground slow speed point, and the maximum speed point.

[0020] Furthermore, step S5 specifically includes:

[0021] S53. Use a general two-dimensional flow characteristic table to conduct a pull test: Repeat the high-altitude simulation test by randomly pulling the flow by 1, 2, and 3 times respectively. The standard for pull is: when the flow rate is less than M kg, the flow rate difference is ±X kg; when the flow rate is greater than M kg, the flow rate difference is ±Y kg.

[0022] Furthermore, in step S53, when repeating the high-altitude simulation test by randomly shifting the bias by 1, 2, and 3 times respectively, the flow rate after shifting is randomly generated and only needs to be within the range of multiples of the corresponding flow rate difference.

[0023] Furthermore, in step S6,

[0024] The engines with different working hours include engines that have just been put into use and have qualified performance, engines that have been run-in for a set period of time and have qualified performance, and engines that have been running for a period of time and have qualified performance.

[0025] The fuel pump regulators with different flow characteristics refer to fuel pump regulators with flow characteristics of random deviation by 1, random deviation by 2, and random deviation by 3 times based on a general two-dimensional flow characteristic table.

[0026] The different engine environments simulate different high-altitude environments.

[0027] Furthermore, it also includes the following steps:

[0028] S1. Control the tolerance requirements of each surface point of the fuel pump regulator's metering needle to ensure the consistency of needle displacement-flow rate; no heat treatment process is required after precision machining of the inclined needle surface; ensure that the fuel pump regulator meets the high-precision step angle and consistency requirements of the stepper motor; adopt an epoxy resin filling process to protect the stator and rotor coils of the contactless resolver transmitter with epoxy resin, improving the coaxiality between the stator and rotor; in terms of equipment-level testing, multi-point displacement-flow characteristic tests are carried out for each set of metering needle components to check the flow characteristics at each point.

[0029] Compared with the prior art, this application has the following advantages:

[0030] This application provides a method for obtaining a universal two-dimensional flow characteristic table for a fuel pump regulator. This method enables the fuel pump regulator to have a universal two-dimensional flow characteristic table, improves the maintainability of CNC systems (including digital electronic controllers and fuel pump regulators) in the field, and realizes true equipment interchangeability of CNC systems in the field without adjusting parameters. It improves maintainability and reduces the adverse effects of replacing the wrong two-dimensional flow characteristic table. It is simple, practical, and has a wide range of applications. It can improve the maintainability of engines, reduce the investment of human resources and equipment in field maintenance, and reduce maintenance costs.

[0031] In addition to the purposes, features, and advantages described above, this application provides other purposes, features, and advantages. The application will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0032] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0033] Figure 1 This is a schematic flowchart of a method for obtaining a general two-dimensional flow characteristic table of a fuel regulator according to a preferred embodiment of this application.

[0034] Figure 2 This is a flowchart illustrating a sub-step of step S5 in a preferred embodiment of this application.

[0035] Figure 3 This is a flowchart illustrating another sub-step of step S5 in a preferred embodiment of this application.

[0036] Figure 4 This is a flowchart illustrating another sub-step of step S5 in a preferred embodiment of this application.

[0037] Figure 5 This is a schematic diagram of a method for obtaining a general two-dimensional flow characteristic table of a fuel regulator according to another preferred embodiment of this application. Detailed Implementation

[0038] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0039] Reference Figure 1 A preferred embodiment of this application provides a method for obtaining a universal two-dimensional flow characteristic table for a fuel regulator, including the following steps:

[0040] S2. Based on the accumulated data of N fuel pump regulator samples and engine test data, the average value of the flow characteristics of the N fuel pump regulators at different openings under different speeds (factory condition, which will decay after a period of use) is calculated to obtain a general two-dimensional flow characteristic table.

[0041] S3. Based on the general two-dimensional flow characteristic table, select several typical speed points for comparison, and calculate the difference between the two-dimensional flow characteristic table data of N fuel pump regulators and the general two-dimensional flow characteristic table.

[0042] S4. Analyze the data from the engine field test to determine the actual flow range required by the engine at each speed point. Obtain the fuel needle range when the engine is actually working from the general two-dimensional flow characteristic table. Select some flow characteristic points when the engine is actually working. Combine the fuel needle range to check the flow characteristics of N fuel pump regulators. During the check, the steady-state error of fuel metering must meet the requirements of the technical agreement.

[0043] S5. Conduct semi-physical interchangeability tests on the general two-dimensional flow characteristic table, including functional performance tests, high-altitude simulation tests, and pull tests. If the start-up process, steady-state control error, and overshoot of acceleration and deceleration meet the requirements during the test, then the general two-dimensional flow characteristic table meets the requirements.

[0044] S6. Select engines with different operating hours, fuel pump regulators with different flow characteristics, and different engine environments to conduct bench verification tests. If the starting process, steady-state control error, and overshoot during acceleration and deceleration meet the requirements during the test, then the general two-dimensional flow characteristic table meets the requirements.

[0045] This embodiment provides a method for obtaining a universal two-dimensional flow characteristic table for a fuel pump regulator. This method enables the fuel pump regulator to have a universal two-dimensional flow characteristic table, improves the maintainability of CNC systems (including digital electronic controllers and fuel pump regulators) in the field, and realizes true equipment interchangeability of CNC systems in the field without adjusting parameters. It improves maintainability and reduces the adverse effects of replacing the wrong two-dimensional flow characteristic table. It is simple, practical, and widely applicable, which can improve the maintainability of the engine, reduce the investment of human resources and equipment in field maintenance, and reduce maintenance costs.

[0046] Preferably, in step S3, the several typical speed points include: the initial fuel injection speed point, the slowest speed point, and the maximum speed point. The advantage of this is that it saves data analysis time and can obtain the two-dimensional flow characteristic table data of N fuel pump regulators and the flow characteristic differences of the general two-dimensional flow characteristic table.

[0047] Preferably, in step S3, the differences between the two-dimensional flow characteristic table data of the N fuel pump regulators and the general two-dimensional flow characteristic table include:

[0048] When the flow rate in the two-dimensional flow characteristic table of the fuel pump regulator is less than Mkg, the flow rate difference between the two-dimensional flow characteristic table of the fuel pump regulator and the general two-dimensional flow characteristic table is ±Xkg. When the flow rate in the two-dimensional flow characteristic table of the fuel pump regulator is greater than Mkg, the flow rate difference between the two-dimensional flow characteristic table of the fuel pump regulator and the general two-dimensional flow characteristic table is ±Ykg, where Y>X. This embodiment obtains the flow rate difference index under different flow rates to provide necessary supporting data for subsequent pull-off tests.

[0049] Preferably, in step S4, when analyzing the data from the engine field test, the minimum and maximum flow rates at 10%, 20%, ... 100% of the operating speed are extracted. This has the advantage of saving data analysis time and obtaining the range of flow rate changes within the engine's operating envelope.

[0050] Preferably, such as Figure 2 As shown, step S5 specifically includes:

[0051] S51. Functional performance tests are conducted using a general two-dimensional flow characteristic table, mainly including starting performance, steady-state control, and acceleration / deceleration control. If the starting process, steady-state control error, and acceleration / deceleration overshoot meet the requirements, then the general two-dimensional flow characteristic table meets the requirements. The requirement that the starting process meets the requirements includes that the starting time meets the requirements and that there are no abnormalities such as suspension or overheating. This embodiment verifies whether the general two-dimensional flow characteristic table meets the requirements by using a functional performance test.

[0052] Preferably, such as Figure 3 As shown, step S5 specifically further includes:

[0053] S52. A high-altitude simulation test is conducted using a general two-dimensional flow characteristic table. Several typical operating points within the engine's operating envelope are selected for functional performance tests. Repeated functional performance tests are performed. If the starting process, steady-state control error, and acceleration / deceleration overshoot meet the requirements, then the general two-dimensional flow characteristic table meets the requirements. The starting process meeting the requirements includes meeting the starting time requirements and the absence of suspension or overheating abnormalities. The several typical operating points include the initial fuel injection speed point, the ground idle speed point, and the maximum speed point. Since the general two-dimensional flow characteristic table has a significant impact on the engine's open-loop starting process and a smaller impact after switching to closed-loop control, it is necessary to focus on verifying it under high-altitude environmental conditions. Therefore, this embodiment further selects several typical operating points within the engine's operating envelope under high-altitude simulation conditions for functional performance tests. Repeated functional performance tests are performed to further verify whether the general two-dimensional flow characteristic table meets the actual requirements.

[0054] Preferably, such as Figure 4 As shown, step S5 specifically further includes:

[0055] S53. Use a general two-dimensional flow characteristic table to conduct a pull test: Repeat the high-altitude simulation test by randomly pulling the flow by 1, 2, and 3 times respectively. The standard for pull is: when the flow rate is less than M kg, the flow rate difference is ±X kg; when the flow rate is greater than M kg, the flow rate difference is ±Y kg.

[0056] For example, regarding the random deviation of 2 times: when the flow rate is less than M kg, the flow rate difference is within ±2X kg; when the flow rate is greater than M kg, the flow rate difference is within ±2Y kg. Each flow rate is randomly generated, and it is sufficient to meet the requirement of being within 2 times. The advantage of using random deviations of different multiples for high-altitude simulation tests in this embodiment is that random deviations are more consistent with the differences between actual fuel regulation and the general two-dimensional flow characteristic table. Gradually increasing the deviation of different multiples can gradually determine the working capability of the general two-dimensional flow characteristic table.

[0057] Preferably, in step S53, when repeating the high-altitude simulation test by randomly shifting the bias by 1x, 2x, and 3x respectively, the resulting flow rate is randomly generated and only needs to be within a multiple of the corresponding flow rate difference. This embodiment uses randomly generated random biasing, which better reflects actual working conditions.

[0058] Preferably, in step S6,

[0059] The engines with different operating hours include engines that have just been put into use and have qualified performance, engines that have been run-in for a set period of time and have qualified performance, and engines that have been operating for nearly the first overhaul period and have qualified performance. The advantage is that it can save test resources. By using three engines with different operating conditions, it can be shown whether the general two-dimensional flow characteristic table can work normally throughout the engine's entire life cycle.

[0060] The fuel pump regulators with different flow characteristics refer to fuel pump regulators with flow characteristics of random deviation by 1, random deviation by 2, and random deviation by 3 times based on the general two-dimensional flow characteristic table. The advantage is that the random deviation is more consistent with the difference between the actual fuel pump regulator two-dimensional flow characteristic table and the general two-dimensional flow characteristic table. Gradually increasing the deviation by different multiples can gradually determine the working capacity of the general two-dimensional flow characteristic table.

[0061] The different engine environments simulate different high-altitude environments.

[0062] Preferably, such as Figure 5 As shown, the method for obtaining the general two-dimensional flow characteristic table of the fuel regulator also includes the following steps:

[0063] S1. Control the tolerance requirements of each surface point of the fuel pump regulator's metering needle to ensure the consistency of needle displacement-flow rate; no heat treatment process is required after precision machining of the inclined needle surface; ensure that the fuel pump regulator meets the high-precision step angle and consistency requirements of the stepper motor; adopt an epoxy resin filling process to protect the stator and rotor coils of the contactless resolver transmitter with epoxy resin, improving the coaxiality between the stator and rotor; in terms of equipment-level testing, multi-point displacement-flow characteristic tests are carried out for each set of metering needle components to check the flow characteristics at each point.

[0064] This embodiment takes corresponding measures in product design to ensure that the general two-dimensional flow characteristic table meets the requirements, including:

[0065] Strictly control the tolerance requirements of various points on the surface of the fuel pump regulator's metering needle to ensure consistency between needle displacement and flow rate.

[0066] In terms of process, we focused on improving the machining of the beveled oil needles. By ensuring that no heat treatment process is needed after the finishing surface, we ensured that the part structure did not change significantly before and after the finishing surface. While ensuring the machining accuracy of the part, we also prevented stress release, making the part less prone to deformation. We solved problems such as nonlinear surface machining and oil needle surface stability, improving the accuracy and consistency of the metering oil needles.

[0067] We conducted technical research on high-precision step angle and consistency requirements for stepper motors, and carried out high-precision stator machining, high-precision lamination stacking and high-strength lamination bonding processes on various components of the motor, which improved the accuracy of the step angle of the motor.

[0068] Research was conducted on a high-precision non-contact resolver transmitter. An epoxy resin filling process was adopted to protect the stator and rotor coils with epoxy resin, which improved the coaxiality between the stator and rotor, resulting in good electrical error and high consistency.

[0069] In terms of equipment-level testing, multi-point displacement-flow characteristic tests are conducted on each metering needle assembly to check the flow characteristics at each point. The displacement-flow characteristic test at each point is to ensure that the displacement-flow characteristics meet the protocol requirements. Generally, several typical operating points are selected for displacement-flow characteristic tests. If there are more test samples, the flow characteristics can be obtained more accurately.

[0070] The method for obtaining a universal two-dimensional flow characteristic table for fuel regulators provided in this application is simple, practical, and widely applicable, and can improve engine maintainability. It has already been applied to the fuel pump regulator of a certain aircraft turboshaft engine. The fuel pump regulator with the universal two-dimensional flow characteristic table completed a semi-physical test along with the CNC system and participated in ground bench tests with the engine. The test results show that the solution is reasonable and feasible.

[0071] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0072] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A method for obtaining a universal two-dimensional flow characteristic table for a fuel regulator, characterized in that, Including the following steps: S2. Based on the accumulated data of N fuel pump regulator samples and engine test data, the average value of the flow characteristics of the N fuel pump regulators at different openings under different speeds is calculated to obtain a general two-dimensional flow characteristic table. S3. Based on the general two-dimensional flow characteristic table, select several typical speed points for comparison, and calculate the difference between the two-dimensional flow characteristic table data of N fuel pump regulators and the general two-dimensional flow characteristic table. S4. Analyze the data from the engine field test to determine the actual flow range required by the engine at each speed point. Obtain the fuel needle range when the engine is actually working from the general two-dimensional flow characteristic table. Select some flow characteristic points when the engine is actually working. Combine the fuel needle range to check the flow characteristics of N fuel pump regulators. During the check, the steady-state error of fuel metering must meet the requirements of the technical agreement. S5. Conduct semi-physical interchangeability tests on the general two-dimensional flow characteristic table, including functional performance tests, high-altitude simulation tests, and pull tests. If the start-up process, steady-state control error, and overshoot of acceleration and deceleration meet the requirements during the test, then the general two-dimensional flow characteristic table meets the requirements. S6. Select engines with different operating hours, fuel pump regulators with different flow characteristics, and different engine environments to conduct bench verification tests. If the starting process, steady-state control error, and overshoot during acceleration and deceleration meet the requirements during the test, then the general two-dimensional flow characteristic table meets the requirements.

2. The method for obtaining a universal two-dimensional flow characteristic table for a fuel regulator according to claim 1, characterized in that, In step S3, the several typical speed points include: the initial fuel injection speed point, the ground slow speed point, and the maximum speed point.

3. The method for obtaining a universal two-dimensional flow characteristic table for a fuel regulator according to claim 1, characterized in that, In step S3, the differences between the two-dimensional flow characteristic table data of the N fuel pump regulators and the general two-dimensional flow characteristic table include: When the flow rate in the two-dimensional flow characteristic table of the fuel pump regulator is less than Mkg, the flow rate difference between the two-dimensional flow characteristic table of the fuel pump regulator and the general two-dimensional flow characteristic table is ±Xkg. When the flow rate in the two-dimensional flow characteristic table of the fuel pump regulator is greater than Mkg, the flow rate difference between the two-dimensional flow characteristic table of the fuel pump regulator and the general two-dimensional flow characteristic table is ±Ykg, where Y>X.

4. The method for obtaining a universal two-dimensional flow characteristic table for a fuel regulator according to claim 1, characterized in that, In step S4, when analyzing the data from the engine field test, the minimum and maximum flow rates at 10%, 20%, ... 100% of the operating speed are extracted.

5. The method for obtaining a universal two-dimensional flow characteristic table for a fuel regulator according to claim 1, characterized in that, Step S5 specifically includes: S51. Perform functional performance tests using a general two-dimensional flow characteristic table, mainly including starting performance, steady-state control, and acceleration / deceleration control. If the starting process, steady-state control error, and acceleration / deceleration overshoot meet the requirements, then the general two-dimensional flow characteristic table meets the requirements. The starting process meeting the requirements includes the starting time meeting the requirements and no hanging or overheating abnormalities.

6. The method for obtaining a universal two-dimensional flow characteristic table for a fuel regulator according to claim 5, characterized in that, Step S5 specifically also includes: S52. Use a general two-dimensional flow characteristic table to conduct a high-altitude simulation test. Select several typical operating points within the engine's operating envelope to conduct functional performance tests and repeat the functional performance test. When the starting process, steady-state control error, and overshoot of acceleration and deceleration meet the requirements, the general two-dimensional flow characteristic table meets the requirements. The starting process meeting the requirements includes the starting time meeting the requirements and no suspension or overheating abnormalities. The several typical operating points include the initial fuel injection speed point, the ground idle speed point, and the maximum speed point.

7. The method for obtaining a universal two-dimensional flow characteristic table for a fuel regulator according to claim 6, characterized in that, Step S5 specifically also includes: S53. Use a general two-dimensional flow characteristic table to conduct a pull test: Repeat the high-altitude simulation test by randomly pulling the flow by 1, 2, and 3 times respectively. The standard for pull is: when the flow rate is less than M kg, the flow rate difference is ±X kg; when the flow rate is greater than M kg, the flow rate difference is ±Y kg.

8. The method for obtaining a universal two-dimensional flow characteristic table for a fuel regulator according to claim 7, characterized in that, In step S53, when repeating the high-altitude simulation test by randomly shifting the bias by 1, 2, and 3 times respectively, the flow rate after shifting is randomly generated and only needs to be within the range of multiples of the corresponding flow rate difference.

9. The method for obtaining a universal two-dimensional flow characteristic table for a fuel regulator according to claim 1, characterized in that, In step S6, The engines with different working hours include engines that have just been put into use and have qualified performance, engines that have been run-in for a set period of time and have qualified performance, and engines that have been running for a period of time and have qualified performance. The fuel pump regulators with different flow characteristics refer to fuel pump regulators with flow characteristics of random deviation by 1, random deviation by 2, and random deviation by 3 times based on a general two-dimensional flow characteristic table. The different engine environments simulate different high-altitude environments.

10. The method for obtaining a universal two-dimensional flow characteristic table of a fuel regulator according to any one of claims 1 to 9, characterized in that, It also includes the following steps: S1. Control the tolerance requirements of each surface point of the fuel pump regulator's metering needle to ensure the consistency of needle displacement-flow rate; no heat treatment process is required after precision machining of the inclined needle surface; ensure that the fuel pump regulator meets the high-precision step angle and consistency requirements of the stepper motor; adopt an epoxy resin filling process to protect the stator and rotor coils of the contactless resolver transmitter with epoxy resin, improving the coaxiality between the stator and rotor; in terms of equipment-level testing, multi-point displacement-flow characteristic tests are carried out for each set of metering needle components to check the flow characteristics at each point.

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