Testing device and method for fuel injector parts

Abstract

The invention provides a testing device and method for an oil injector part, and relates to the technical field of oil injector detection, and the testing device comprises a clamp upper pressing block which is provided with a first measurement flow channel, and the first measurement flow channel is used for being communicated with an oil injection pipeline of the oil injector part to be tested; at least one second measuring flow channel and at least one first oil return flow channel are arranged in the clamp lower pressing block, one of the clamp upper pressing block and the clamp lower pressing block can be movably arranged relative to the other one, a detection area is formed between the clamp upper pressing block and the clamp lower pressing block, and the detection area is used for placing an oil injector part to be detected; in the process of detecting the to-be-detected oil injector part, the first measuring flow channel, one oil way of the to-be-detected oil injector part and the first oil return flow channel form a first detection channel, the second measuring flow channel, the other oil way of the to-be-detected oil injector part and the first oil return flow channel form a second detection channel, and the problem that the testing precision of the oil injector part is low is solved.

Description

Technical Field

[0001] The present application relates to the technical field of fuel injector detection, and in particular to a testing device and method for fuel injector parts. Background Art

[0002] As diesel engine emission regulations become increasingly stringent, high-pressure common rail fuel injection technology for internal combustion engines has become one of the mainstream technologies that meet emission standards. Common rail injectors, as one of the core precision components in common rail technology, directly affect engine performance, while control valves and injectors, as key components in injectors, will directly affect the pressure changes in the injector control chamber, thereby affecting the performance of the injector. In actual production, the control valve oil hole and the injector oil hole will have differences in aperture, taper, roughness, etc. after processing, which will lead to differences in injector performance, so testing and screening must be carried out after the oil hole is processed. Flow testing is an important indicator of production standards.

[0003] In the prior art, most test systems are only applied to a single part, and the measurement accuracy is low. Different test systems need to be designed to test different parts, and the versatility is low. In addition, most of the test systems in the prior art cannot meet the conditions of fixed back pressure testing.

[0004] To address the above problems, no effective solution has been proposed yet. Summary of the invention

[0005] The main purpose of the present application is to provide a testing device and method for injector parts to solve the problem of low testing accuracy of injector parts in the prior art.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a testing device for injector parts is provided, comprising: an upper clamp block, the upper clamp block having a first measuring flow channel, the first measuring flow channel being used to communicate with the injection pipeline of the injector part to be tested; a lower clamp block, at least one second measuring flow channel and at least one first oil return flow channel being arranged in the lower clamp block, one of the upper clamp block and the lower clamp block being movably arranged relative to the other, and a detection area being formed between the upper clamp block and the lower clamp block, the detection area being used to place the injector part to be tested; wherein, during the detection of the injector part to be tested, the first measuring flow channel and one oil circuit and the first oil return flow channel of the injector part to be tested form a first detection passage, and the second measuring flow channel and another oil circuit and the first oil return flow channel of the injector part to be tested form a second detection passage.

[0007] Furthermore, the testing device includes: an oil tank, a first oil return flow channel is arranged to be connected to the oil tank; a working branch, an output end of the oil tank is connected to an input end of the working branch; a flow branch, an output end of the working branch is connected to an input end of the flow branch; a measuring branch, an output end of the flow branch is connected to an input end of the measuring branch, a first measuring end of the measuring branch is connected to a first detection passage through a first switch valve, and a second measuring end of the measuring branch is connected to a second detection passage through a second switch valve.

[0008] Furthermore, the flow branch includes: a first flow branch, the first output end of the working branch is connected to the input end of the first flow branch, the output end of the first flow branch is connected to the input end of the measuring branch, and the first flow branch is provided with a first rotary valve and a first flow meter; a second flow branch, the second output end of the working branch is connected to the input end of the second flow branch, the output end of the second flow branch is connected to the input end of the measuring branch, and the second flow branch is provided with a second rotary valve and a second flow meter.

[0009] Furthermore, a second oil return channel is provided in the clamp lower pressing block, the second oil return channel is connected to the oil tank, and the third measuring end of the measuring branch is connected to the second oil return channel through a third switch valve.

[0010] Furthermore, the testing device includes: a forward pressure servo valve, the third output end of the working branch is connected to the oil tank through the forward pressure servo valve; a back pressure filling valve, the fourth output end of the working branch is connected to the input end of the back pressure filling valve; a back pressure servo valve, the output end of the back pressure filling valve is connected to the input end of the back pressure servo valve, and the first return oil flow channel is connected to the oil tank through the back pressure servo valve.

[0011] Furthermore, the testing device includes: a forward pressure sensor, which is arranged on the measuring branch; and a back pressure sensor, which is arranged on the pipeline between the first oil return channel and the back pressure servo valve.

[0012] According to another aspect of the present application, a testing method for injector parts is provided, the method adopts the above-mentioned testing device for injector parts for testing, and the method includes the following steps: installing the injector part to be tested between the upper pressing block of the fixture and the lower pressing block of the fixture; obtaining the injection pipeline of the injector part to be tested; based on the injection pipeline, determining the target measurement path of the injector part to be tested, wherein the target measurement path includes at least one of the following: a first detection path and a second detection path; based on the target measurement path, generating a target control strategy set, the target control strategy set is used to control the opening and closing of a target control valve, wherein the target control valve includes at least one of the following: a first switching valve and a second switching valve.

[0013] Furthermore, based on the target measurement path, a target control strategy is generated, including: when it is determined that the target measurement path is the first detection path, a first target control strategy in the target control strategy is generated, and the first target control strategy is used to control the second switch valve, the third switch valve and the back pressure filling valve to close, and control the forward pressure servo valve, the back pressure servo valve and the first switch valve to open; when it is determined that the target measurement path is the second detection path, a second target control strategy in the target control strategy is generated, and the second target control strategy is used to control the first switch valve, the third switch valve and the back pressure filling valve to close, and control the forward pressure servo valve, the back pressure servo valve and the second switch valve to open.

[0014] Furthermore, the method also includes: obtaining a test flow of the injector part to be tested; determining a target flow meter based on the test flow, wherein the target flow meter includes at least one of the following: the first flow meter and the second flow meter; when it is determined that the target flow meter is the first flow meter, controlling the second rotary valve to close, and controlling the first rotary valve to open; when it is determined that the target flow meter is the second flow meter, controlling the first rotary valve to close, and controlling the second rotary valve to open.

[0015] Furthermore, the method also includes: obtaining the test conditions of the injector parts to be tested, wherein the test conditions include at least one of the following: back pressure test, non-back pressure test; when the test condition is determined to be a back pressure test, controlling the back pressure filling valve to open; when the test condition is determined to be a non-back pressure test, controlling the back pressure filling valve to close.

[0016] By applying the technical solution of the present application, the upper pressing block of the moving fixture is moved close to the lower pressing block of the fixture to clamp the injector part to be tested, and a first detection path is formed by a first measuring flow channel, an oil path of the injector part to be tested, and a first oil return flow channel. A second measuring flow channel, another oil path of the injector part to be tested, and the first oil return flow channel form a second detection path. At least two injector parts (control valve and injector nozzle) are tested by a set of testing devices, thereby improving the test accuracy of injector parts, enhancing the versatility of the testing device, and solving the problem of low test accuracy of injector parts in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting part of the present application are used to provide a further understanding of the present application. The exemplary embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0018] Figure 1 A schematic diagram showing an embodiment of a testing device for fuel injector parts according to the present application;

[0019] Figure 2 A schematic structural diagram of an embodiment of a clamp upper pressing block according to the present application is shown;

[0020] Figure 3 A structural schematic diagram of an embodiment of a clamp lower pressing block according to the present application is shown.

[0021] The above drawings include the following reference numerals:

[0022] 1. Heating source;

[0023] 2. Fuel tank;

[0024] 3. Temperature sensor;

[0025] 4. The first rotary valve;

[0026] 5. Second rotary valve;

[0027] 6. The first flow meter;

[0028] 7. Second flow meter;

[0029] 8. Forward pressure sensor;

[0030] 9. Second switch valve;

[0031] 10. First switch valve;

[0032] 11. The third switch valve;

[0033] 12. Back pressure sensor;

[0034] 13. Forward pressure servo valve;

[0035] 14. Back pressure servo valve;

[0036] 15. Back pressure filling valve;

[0037] 16. Clamp upper pressure block; 161. First measuring flow channel; 162. Sealing peek material; 163. Nut; 164. Lower pressure head;

[0038] 17. Clamp lower pressing block; 171. Second measuring flow channel; 172. First oil return flow channel; 173. Second oil return flow channel;

[0039] 31. Working branch; 32. Measuring branch. DETAILED DESCRIPTION

[0040] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0041] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0042] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0043] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in a variety of different forms and should not be construed as being limited to the embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of the present application thorough and complete, and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art. In the accompanying drawings, for the sake of clarity, the thickness of the layers and regions may be enlarged, and the same reference numerals are used to represent the same devices, and thus their descriptions will be omitted.

[0044] Combination Figures 1 to 3 In a specific embodiment of the present application, a testing device for injector parts is provided.

[0045] Specifically, the test device for the injector part includes a fixture upper pressing block 16 and a fixture lower pressing block 17, the fixture upper pressing block 16 has a first measuring flow channel 161, and the first measuring flow channel 161 is used to communicate with the injection pipeline of the injector part to be tested; at least one second measuring flow channel 171 and at least one first oil return flow channel 172 are arranged in the fixture lower pressing block 17, one of the fixture upper pressing block 16 and the fixture lower pressing block 17 can be movably arranged relative to the other, and a detection area is formed between the fixture upper pressing block 16 and the fixture lower pressing block 17, and the detection area is used to place the injector part to be tested; wherein, in the process of detecting the injector part to be tested, the first measuring flow channel 161 and an oil circuit of the injector part to be tested and the first oil return flow channel 172 form a first detection passage, and the second measuring flow channel 171 and another oil circuit of the injector part to be tested and the first oil return flow channel 172 form a second detection passage.

[0046] Combination Figures 1 to 3 As shown, the upper clamp block 16 and the lower clamp block 17 have a clamping position for clamping the injector part to be tested, and the upper clamp block 16 and the lower clamp block 17 have a releasing position for releasing the injector part to be tested. When the upper clamp block 16 and the lower clamp block 17 are in the clamping position, the first measuring flow channel 161 and the second measuring flow channel 171 can be respectively connected to two independent oil circuits of the injector part (for example, the control valve oil circuit and the injector nozzle oil circuit). By switching different flow channels, the flow characteristics of these parts can be tested separately without changing the test device, thereby reducing the test time and complexity.

[0047] Combination Figure 2 As shown, in a specific embodiment of the present application, the upper pressure block 16 of the fixture includes a sealing peek material 162, a nut 163 and a lower pressure head 164, the lower pressure head 164 is connected to the sealing peek material 162, part of the nut 163 is arranged along the circumference of the lower pressure head 164, part of the nut 163 is arranged along the circumference of the sealing peek material 162, and part of the first measuring channel 161 is formed in the lower pressure head 164, and the other part of the first measuring channel 161 is formed in the sealing peek material 162. This arrangement improves the oil sealing and part fixing stability during the test process.

[0048] Furthermore, the testing device includes an oil tank 2, a working branch 31, a flow branch and a measuring branch 32, and the first oil return channel 172 is arranged to be connected to the oil tank 2; the output end of the oil tank 2 is connected to the input end of the working branch 31; the output end of the working branch 31 is connected to the input end of the flow branch; the output end of the flow branch is connected to the input end of the measuring branch 32, the first measuring end of the measuring branch 32 is connected to the first detection passage through the first switch valve 10, and the second measuring end of the measuring branch 32 is connected to the second detection passage through the second switch valve 9.

[0049] Combination Figure 1 As shown, as the oil supply source of the entire test system, the oil tank 2 not only stores the oil, but also maintains the constant temperature of the oil through the built-in heating source 1 and the temperature sensor 3, ensuring the consistency of the test conditions and helping to improve the test accuracy. The output end of the oil tank 2 and the input end of the working branch 31 are connected to provide a stable oil flow. The working branch 31 usually includes components such as an oil pump and a filter to ensure that the oil is clean and the flow is stable. The first switch valve 10 and the second switch valve 9 respectively control the connection between the first measuring end and the second measuring end of the measuring branch 32 and different detection paths. Through the opening and closing of these switch valves, the test system can flexibly select the control valve oil circuit or the nozzle oil circuit of the test injector to meet different test requirements.

[0050] Furthermore, the flow branch includes a first flow branch and a second flow branch, the first output end of the working branch 31 is connected to the input end of the first flow branch, the output end of the first flow branch is connected to the input end of the measuring branch 32, and the first flow branch is provided with a first rotary valve 4 and a first flow meter 6; the second output end of the working branch 31 is connected to the input end of the second flow branch, the output end of the second flow branch is connected to the input end of the measuring branch 32, and the second flow branch is provided with a second rotary valve 5 and a second flow meter 7.

[0051] Combination Figure 1 As shown, the first flowmeter 6 can be set as a small-range flowmeter with a flow range of 0-5L / min, and the second flowmeter 7 can be set as a large-range flowmeter with a flow range of 0-25L / min. Since the first flowmeter 6 and the second flowmeter 7 are optimized for different ranges, especially under low-flow or high-flow test conditions, the test accuracy can be improved by selecting a suitable flowmeter according to the flow range of the part to be tested.

[0052] Furthermore, a second oil return channel 173 is provided in the clamp lower pressing block 17 , and the second oil return channel 173 is connected to the oil tank 2 . The third measuring end of the measuring branch 32 is connected to the second oil return channel 173 through the third switch valve 11 .

[0053] Combination Figure 3 As shown, in this embodiment, the third switch valve 11 is used to control the on-off between the third measuring end of the measuring branch 32 and the second oil return channel 173. In the test preparation stage or when flow measurement is not required, the third switch valve 11 can be opened to allow the oil to return directly from the measuring branch through the second oil return channel 173 to the oil tank 2, thereby avoiding accumulation or overheating of the oil in the system, while maintaining oil circulation and maintaining system temperature stability. During the formal test, the third switch valve 11 is closed to ensure that the oil passes through the first detection path or the second detection path, so as to obtain accurate flow data.

[0054] Furthermore, the testing device includes a forward pressure servo valve 13, a back pressure servo valve 14 and a back pressure filling valve 15; the third output end of the working branch 31 is connected to the oil tank 2 through the forward pressure servo valve 13; the fourth output end of the working branch 31 is connected to the input end of the back pressure filling valve 15; the output end of the back pressure filling valve 15 is connected to the input end of the back pressure servo valve 14, and the first oil return channel 172 is connected to the oil tank 2 through the back pressure servo valve 14.

[0055] In a specific embodiment of the present application, during testing, the back pressure of the first oil return channel 172 can be adjusted by the back pressure servo valve 14, thereby affecting the oil flow in the first detection passage and the second detection passage. The back pressure filling valve 15 opens under the back pressure condition set in the test, allowing the oil to enter the back pressure servo valve 14 from the working branch, and the latter then adjusts its opening degree according to the pressure value fed back by the back pressure sensor to ensure that a stable back pressure is maintained. This back pressure control is crucial for testing the performance of the injector under different back pressure conditions, and can more comprehensively evaluate the performance of the injector. At the same time, the consistency of the test conditions and the reliability of the data are ensured through the precise control of the forward pressure servo valve 13 and the back pressure servo valve 14.

[0056] Furthermore, the testing device includes a forward pressure sensor 8 and a back pressure sensor 12 . The forward pressure sensor 8 is arranged on the measuring branch 32 ; the back pressure sensor 12 is arranged on the pipeline between the first oil return channel 172 and the back pressure servo valve 14 .

[0057] In this embodiment, the forward pressure servo valve 13 receives the feedback signal from the forward pressure sensor 8, adjusts its opening according to the set forward pressure value, and ensures that the oil reaches a predetermined pressure before entering the test oil circuit. This is very important for simulating the pressure conditions of the injector in actual operation, and can ensure the accuracy and reliability of the test results. The back pressure servo valve 14 is located on the path between the first return oil channel 172 and the oil tank 2, and is used to adjust the pressure of the oil when it returns to the oil tank from the test oil circuit, that is, the so-called back pressure. The back pressure servo valve 14 receives the signal from the back pressure sensor 12, adjusts its opening according to the set back pressure value, and thus accurately controls the back pressure of the oil.

[0058] In another embodiment of the present application, a method for testing a fuel injector part is provided. The method uses the above-mentioned testing device for fuel injector parts for testing. The method comprises the following steps:

[0059] Step S10: Install the injector part to be tested between the upper pressing block and the lower pressing block of the fixture.

[0060] In step S10, before the test begins, the injector part to be tested needs to be installed between the upper clamp block 16 and the lower clamp block 17. This step ensures that the part is properly fixed during the test and ensures the precise connection between the part and the test oil circuit, which is the first step in test preparation.

[0061] Step S20: Obtain the fuel injection pipeline of the fuel injector component to be tested.

[0062] In step S20, after the installation is completed, it is necessary to obtain the fuel injection pipeline information of the fuel injector part to be tested, which includes the type of the fuel injector part to be tested, the oil circuit size of the fuel injector part to be tested, the oil inlet and outlet directions of the circuit, etc.

[0063] Step S30: Based on the fuel injection pipeline, determine a target measurement path of the fuel injector part to be tested, wherein the target measurement path includes at least one of the following: a first detection path and a second detection path.

[0064] In step S30, based on the injection pipeline information obtained in step S20, the test method needs to determine a target measurement path suitable for the part to be tested. The target measurement path can be a first detection path suitable for testing parts with a small flow rate, such as a control valve; or a second detection path suitable for testing parts with a large flow rate, such as an injection nozzle.

[0065] Step S40: Based on the target measurement path, generate a target control strategy set, the target control strategy set is used to control the opening and closing of the target control valve, wherein the target control valve includes at least one of the following: a first switch valve and a second switch valve.

[0066] In step S40, after determining the target measurement path, the test method needs to generate a target control strategy set based on this oil path. This strategy set includes instructions for controlling the opening and closing of the first switch valve and / or the second switch valve to ensure that the oil can flow through the part to be tested through the correct measurement oil path. At the same time, if the test requires, the working state of the forward pressure servo valve 13 and the back pressure servo valve 14 is also controlled to provide the necessary forward pressure and back pressure conditions.

[0067] Through the above steps, the standardization of the test process is ensured, and the flexibility and accuracy of the test are greatly improved. It can adapt to the testing requirements of different injector parts.

[0068] In an exemplary embodiment of the present application, the measurement method further includes the following steps:

[0069] Step S400: When it is determined that the target measurement path is the third measurement oil path in the target measurement path, a third target control strategy in the target control strategy is generated, and the third target control strategy is used to control the first switch valve, the second switch valve, the back pressure filling valve, the forward pressure servo valve, and the back pressure servo valve to close, and control the third switch valve to open.

[0070] In step S400, before the bench is started, the clamp upper block 16 is in the release position, the third switch valve 11 is a normally open valve, and the remaining control valves (the first switch valve 10, the second switch valve 9, the back pressure filling valve 15, the forward pressure servo valve 13, and the back pressure servo valve 14) are all normally closed valves. After the bench is powered on and started (start-up preparation and replacement of the test piece), the PID controller controls the heating source 1 to power on and heat it through the data of the temperature sensor 3 until it is heated to 40°C. The engine oil flows from the oil tank 2 through the working branch 31, the flow branch, and the measuring branch 32, and directly enters the oil tank 2 through the third switch valve 11 along the second oil return channel 173. In this state, the position of the clamp upper block 16 does not affect the on-off of the oil circuit. Preheating or replacement of the test piece before testing can be performed. When the test starts, move the clamp upper block 16 to the clamping position.

[0071] Optionally, based on the target measurement path, a target control strategy is generated, including:

[0072] Step S41: When it is determined that the target measurement path is the first detection path, a first target control strategy in the target control strategy is generated, and the first target control strategy is used to control the second switch valve, the third switch valve and the back pressure filling valve to close, and control the forward pressure servo valve, the back pressure servo valve and the first switch valve to open.

[0073] In step S41, the heating source 1 and the temperature sensor 3 continue to work, at which time the second switch valve 9, the third switch valve 11 and the back pressure filling valve 15 are closed, the forward pressure servo valve 13, the back pressure servo valve 14 and the first switch valve 10 are opened, and the engine oil flows through the first measurement flow channel 161 in the upper clamp block 16 through the flow meter through the first switch valve 10 through the injector part to be tested, and returns to the oil tank through the back pressure servo valve 14 along the first return oil flow channel 172 of the lower clamp block 17. The other way passes through the forward pressure servo valve 13 and then returns to the oil tank. The forward pressure servo valve 13 receives the pressure data measured by the forward pressure sensor 8, and controls its own opening according to the difference between the actual pressure data and the set forward pressure, thereby controlling the oil pressure flowing through the first switch valve 10.

[0074] Step S42: When it is determined that the target measurement path is the second detection path, a second target control strategy in the target control strategy is generated, and the second target control strategy is used to control the first switch valve, the third switch valve and the back pressure filling valve to close, and control the forward pressure servo valve, the back pressure servo valve and the second switch valve to open.

[0075] In step S42, the heating source 1 and the temperature sensor 3 continue to work, at which time the first switch valve 10, the third switch valve 11 and the back pressure filling valve 15 are closed, the forward pressure servo valve 13, the back pressure servo valve 14 and the second switch valve 9 are opened, and the oil flows through the second switch valve 9 through the flow meter along the second measuring flow channel 171 in the clamp lower pressing block 17 through the injector part to be tested, and returns to the oil tank through the back pressure servo valve 14 along the first oil return flow channel 172 of the clamp lower pressing block 17. The other way passes through the forward pressure servo valve 13 and then returns to the oil tank. The forward pressure servo valve 13 receives the pressure data measured by the forward pressure sensor 8, and controls its own opening according to the difference between the actual pressure data and the set forward pressure, thereby controlling the oil pressure flowing through the second switch valve 9.

[0076] Through the above steps, the test device can accurately control the flow direction and pressure conditions of the oil. Whether it is a top and bottom oil inlet test or a lateral oil inlet test, it can ensure that it is carried out under the most appropriate oil circuit and conditions, greatly improving the accuracy and efficiency of the test.

[0077] Optionally, the method further comprises the following steps:

[0078] Step S51: obtaining the test flow rate of the injector part to be tested;

[0079] Step S52: determining a target flow meter based on the test flow, wherein the target flow meter includes at least one of the following: the first flow meter and the second flow meter;

[0080] Step S53: when it is determined that the target flow meter is the first flow meter, the second rotary valve is controlled to be closed, and the first rotary valve is controlled to be opened;

[0081] Step S54: when it is determined that the target flow meter is the second flow meter, the first rotary valve is controlled to be closed, and the second rotary valve is controlled to be opened.

[0082] Through the above steps, the most suitable flow meter can be intelligently selected according to the specific needs of the parts to be tested, and the state of the rotary valve can be dynamically adjusted to ensure that the flow measurement of the oil is carried out under the most suitable conditions, thereby improving the test accuracy and flexibility.

[0083] Optionally, the method further comprises the following steps:

[0084] Step S61: obtaining the test conditions of the injector component to be tested, wherein the test conditions include at least one of the following: back pressure test and non-back pressure test.

[0085] Step S62: When it is determined that the test condition is a back pressure test, the back pressure filling valve is controlled to open.

[0086] Step S63: When the test condition is determined to be a non-back pressure test, the back pressure filling valve is controlled to be closed.

[0087] The above steps can simulate various pressure conditions in actual work, so that the test device can flexibly adapt to the needs of backpressure test and non-backpressure test, which not only improves the flexibility and efficiency of the test, but also ensures the accuracy and reliability of the test data. Whether in the backpressure test simulating the actual working conditions or in the simpler and more direct non-backpressure test, high-quality test results can be obtained.

[0088] From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

[0089] 1. Use two range mass flow meters to implement a set of system variable range flow tests.

[0090] 2. The design of this test device takes the influence of temperature into consideration to ensure that the temperature is stable at the measurement set value, and the temperature of the measurement module is uniform through the circulating oil circuit.

[0091] 3. This test device adopts a pneumatic pressure regulating valve to adjust the test pressure, and is designed with a back pressure filling oil circuit, which can adjust the front pressure and back pressure at the same time. It has fast adjustment speed and high efficiency, and can meet the needs of different test conditions.

[0092] 4. The oil circuit of this test device adopts two oil inlet methods: upper end oil inlet and side end oil inlet, which can meet the test methods of the oil nozzle pair and the valve sleeve at the same time, reduce the frequency of replacement of the test fixture and the design difficulty, and has good practicality and economic value.

[0093] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0094] In addition to the above, it should be noted that "one embodiment", "another embodiment", "embodiment", etc. mentioned in this specification refer to the specific features, structures or characteristics described in conjunction with the embodiment included in at least one embodiment generally described in this application. The same expression appearing in multiple places in the specification does not necessarily refer to the same embodiment. Further, when describing a specific feature, structure or characteristic in conjunction with any embodiment, it is claimed that the realization of such feature, structure or characteristic in conjunction with other embodiments also falls within the scope of this application.

[0095] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0096] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A testing device for injector parts, characterized in that: include: A clamp upper pressing block (16), the clamp upper pressing block (16) having a first measuring flow channel (161), the first measuring flow channel (161) being used to communicate with a fuel injection pipeline of a fuel injector part to be tested; A clamp lower pressing block (17), wherein at least one second measuring flow channel (171) and at least one first oil return flow channel (172) are arranged in the clamp lower pressing block (17), one of the clamp upper pressing block (16) and the clamp lower pressing block (17) can be movably arranged relative to the other, and a detection area is formed between the clamp upper pressing block (16) and the clamp lower pressing block (17), and the detection area is used to place the injector part to be tested; In the process of detecting the injector part to be tested, the first measuring flow channel (161) and one oil circuit of the injector part to be tested and the first oil return flow channel (172) form a first detection passage, and the second measuring flow channel (171) and another oil circuit of the injector part to be tested and the first oil return flow channel (172) form a second detection passage.

2. The testing device according to claim 1, characterized in that: The test setup includes: An oil tank (2), wherein the first oil return channel (172) is arranged in communication with the oil tank (2); A working branch (31), wherein the output end of the oil tank (2) is connected to the input end of the working branch (31); A flow branch, wherein the output end of the working branch (31) is connected to the input end of the flow branch; A measuring branch (32), wherein the output end of the flow branch is connected to the input end of the measuring branch (32), the first measuring end of the measuring branch (32) is connected to the first detection passage through a first switch valve (10), and the second measuring end of the measuring branch (32) is connected to the second detection passage through a second switch valve (9).

3. The testing device according to claim 2, characterized in that: The flow branch includes: a first flow branch, wherein the first output end of the working branch (31) is connected to the input end of the first flow branch, the output end of the first flow branch is connected to the input end of the measuring branch (32), and the first flow branch is provided with a first rotary valve (4) and a first flow meter (6); A second flow branch, wherein the second output end of the working branch (31) is connected to the input end of the second flow branch, the output end of the second flow branch is connected to the input end of the measuring branch (32), and a second rotary valve (5) and a second flow meter (7) are provided on the second flow branch.

4. The testing device according to claim 2, characterized in that: A second oil return channel (173) is provided in the clamp lower pressing block (17), and the second oil return channel (173) is connected to the oil tank (2). The third measuring end of the measuring branch (32) is connected to the second oil return channel (173) via a third switch valve (11).

5. The testing device according to any one of claims 2 to 4, characterized in that: The testing device comprises: A forward pressure servo valve (13), wherein the third output end of the working branch (31) is connected to the oil tank (2) through the forward pressure servo valve (13); A back-pressure filling valve (15), wherein the fourth output end of the working branch (31) is connected to the input end of the back-pressure filling valve (15); A back pressure servo valve (14), the output end of the back pressure filling valve (15) is connected to the input end of the back pressure servo valve (14), and the first oil return channel (172) is connected to the oil tank (2) through the back pressure servo valve (14).

6. The testing device according to claim 5, characterized in that: The testing device comprises: a front pressure sensor (8), the front pressure sensor (8) being arranged on the measuring branch (32); A back pressure sensor (12), wherein the back pressure sensor (12) is arranged on a pipeline between the first oil return channel (172) and the back pressure servo valve (14).

7. A testing method for injector parts, characterized in that: The method uses the testing device for injector parts according to any one of claims 1 to 6 for testing, and the method comprises the following steps: Install the injector parts to be tested between the upper clamp and the lower clamp of the fixture; Obtaining the fuel injection pipeline of the fuel injector part to be tested; Based on the fuel injection pipeline, determining a target measurement path of the fuel injector part to be tested, wherein the target measurement path includes at least one of the following: a first detection path and a second detection path; Based on the target measurement path, a target control strategy set is generated, wherein the target control strategy set is used to control the opening and closing of a target control valve, wherein the target control valve includes at least one of the following: a first switch valve and a second switch valve.

8. The method according to claim 7, characterized in that Based on the target measurement path, generating the target control strategy includes: In the case where it is determined that the target measurement path is the first detection path, a first target control strategy among the target control strategies is generated, wherein the first target control strategy is used to control the second switch valve, the third switch valve and the back pressure filling valve to be closed, and to control the forward pressure servo valve, the back pressure servo valve and the first switch valve to be opened; When it is determined that the target measurement path is the second detection path, a second target control strategy in the target control strategy is generated, and the second target control strategy is used to control the first switch valve, the third switch valve and the back pressure filling valve to close, and control the forward pressure servo valve, the back pressure servo valve and the second switch valve to open.

9. The method according to claim 7 or 8, characterized in that: The method further comprises: Obtaining a test flow rate of the injector component to be tested; Based on the test flow, determining a target flow meter, wherein the target flow meter comprises at least one of the following: the first flow meter and the second flow meter; When it is determined that the target flow meter is the first flow meter, controlling the second rotary valve to close, and controlling the first rotary valve to open; When it is determined that the target flow meter is the second flow meter, the first rotary valve is controlled to be closed, and the second rotary valve is controlled to be opened.

10. The method according to any one of claims 7 or 8, characterized in that The method further comprises: Acquire the test conditions of the injector part to be tested, wherein the test conditions include at least one of the following: back pressure test and non-back pressure test; When it is determined that the test condition is the back pressure test, controlling the back pressure filling valve to open; When it is determined that the test condition is the non-backpressure test, the backpressure filling valve is controlled to be closed.

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