Test bench and test method for a plunger pump subsystem

Abstract

The application discloses a test bench and a test method for a plunger pump subsystem, comprising a back pressure source module, a first test module and a second test module, wherein the back pressure source module comprises a gas source, a pressure regulating valve and a gas pressure boosting cylinder connected through pipelines to provide a constant low pressure section back pressure source and a constant high pressure section back pressure source; the first test module has a first test station, one end of the first test station is connected to the back pressure source module through a pipeline to access the back pressure source, and the other end of the first test station is connected to an adjustable constant pressure load device; the second test module has a second test station, one end of the second test station is connected to the back pressure source module through a pipeline to access the back pressure source, and the other end of the second test station is connected to a simulation load device; and the application can meet the needs of plunger pump function, performance and failure verification.

Description

Technical Field

[0001] This application relates to the field of automotive testing technology, and in particular to a test bench and test method for a plunger pump subsystem. Background Technology

[0002] The most basic function of a plunger pump is its pumping capability. It plays different roles in automotive anti-lock braking systems (ABS) and electronic stability control (ESC). The design requirements for the key characteristics of various related components in the plunger pump subsystem differ, necessitating different parameter designs and experimental verification. For example, the ABS system primarily performs pressure reduction, while the ESC system, in addition to pressure reduction, also has an active pressure boosting function. Therefore, comprehensive functional and performance testing and failure verification of the plunger pump subsystem are required, along with obtaining the design parameters of its components. However, currently, there is no experimental platform or method that can meet the performance testing needs of the plunger pump subsystem. Summary of the Invention

[0003] To address the aforementioned problems, this application provides a test bench and test method for a plunger pump subsystem, which can meet the needs of plunger pump function, performance, and failure verification. The technical solution is as follows:

[0004] The first aspect of this application provides a test bench for a plunger pump subsystem, including a back pressure source module, a first test module, and a second test module. The back pressure source module includes a gas source, a pressure regulating valve, and a gas pressure boosting cylinder connected by pipelines to provide a back pressure source in a constant low-pressure section and a back pressure source in a constant high-pressure section. The first test module has a first test station, one end of which is connected to the back pressure source module via a pipeline to access the back pressure source, and the other end of which is connected to an adjustable constant pressure load device. The second test module has a second test station, one end of which is connected to the back pressure source module via a pipeline to access the back pressure source, and the other end of which is connected to a simulated load device.

[0005] For example, in the test bench of the plunger pump subsystem provided in one embodiment, a first flow meter and a first pressure sensor are provided on the connecting pipeline between the first test station and the adjustable constant pressure load device.

[0006] For example, in the test bench of the plunger pump subsystem provided in one embodiment, a second pressure sensor is provided on the connecting pipeline between the second test station and the simulated load device, and the simulated load device is a standard hydraulic cylinder to simulate the brake wheel cylinder.

[0007] For example, in the test bench of the plunger pump subsystem provided in one embodiment, the back pressure source module further includes an oil reservoir connected to the pneumatic booster cylinder, and a second flow meter, a third pressure sensor and a shut-off valve are provided on the pipeline connecting the back pressure source module to the first test module and the second test module.

[0008] For example, in the test bench of the plunger pump subsystem provided in one embodiment, the back pressure source module provides a back pressure source in a constant low pressure range of 0.1MPa to 0.8MPa and a back pressure source in a constant high pressure range of 1MPa to 20MPa.

[0009] The second aspect of this application provides a test method for a plunger pump subsystem, used for negative pressure failure testing of the decompression function of the plunger pump subsystem, comprising the following steps: placing the sample under test at the first station, and connecting the oil outlet of the sample under test to the back pressure source module to access the back pressure source to simulate the wheel cylinder; connecting the oil inlet of the sample under test to the adjustable constant pressure load device to simulate the master cylinder; in the low pressure section, adjusting the constant pressure back pressure source from high to low until 1 atmosphere (0.1 MPa); if the first flow meter detects a stable load output under a back pressure of 0.1 MPa, it indicates that the sample under test system has a risk of wheel cylinder negative pressure failure.

[0010] For example, in a test method for the plunger pump subsystem provided in one embodiment, the test of the pumping capacity of the motor for the pressure reduction function of the plunger pump subsystem includes the following steps: placing the sample under test at the first station, connecting the oil outlet of the sample under test to the back pressure source module to access the back pressure source, simulating a wheel cylinder, connecting the oil inlet of the sample under test to the adjustable constant pressure load device, simulating a master cylinder; given a constant pressure back pressure source and a constant pressure load, under these conditions, the pumping efficiency of the motor plunger pump is reflected by the first flow count value, thereby verifying the influence of changes in the design parameters of each component of the plunger pump subsystem.

[0011] For example, in a test method for the plunger pump subsystem provided in one embodiment, the test of the motor pump capability for the active boosting function of the plunger pump subsystem includes the following steps: placing the sample under test at the first station, connecting the oil inlet of the sample under test to the back pressure source module to access the back pressure source, simulating the master cylinder, and connecting the oil outlet of the sample under test to the adjustable constant pressure load device, simulating the wheel cylinder; given a constant pressure back pressure source and a constant pressure load, under these conditions, the active boosting efficiency of the motor plunger pump is reflected by the first flow count value, thereby verifying the influence of changes in the design parameters of each component of the plunger pump subsystem.

[0012] For example, in a test method for the plunger pump subsystem provided in one embodiment, the pressure build-up time test for the active boost function of the plunger pump subsystem includes the following steps: placing the test sample in the second station, connecting the oil inlet of the test sample to the back pressure source module to access the back pressure source to simulate the master cylinder, connecting the oil outlet of the test sample to the simulated load device to simulate the wheel cylinder; given a constant pressure back pressure source, and based on the standard PV characteristic curve of the simulated load device, obtaining the active boost pressure build-up time of the standard set pressure through the pressure-time curve of the data acquisition system.

[0013] For example, in a test method for the plunger pump subsystem provided in one embodiment, the reliable opening capability test of the main valve of the plunger pump subsystem's suction valve includes the following steps: placing the sample under test at the first station, connecting the oil inlet of the sample under test to the back pressure source module to access the back pressure source to simulate the main cylinder, connecting the oil outlet of the sample under test to the adjustable constant pressure load device to simulate the wheel cylinder; in the high-pressure section, adjusting the constant pressure back pressure source from low to high, and determining whether the main valve of the suction valve can be reliably opened by observing the first flow count value and its change.

[0014] The beneficial effects of the test bench and test method for a plunger pump subsystem provided in some embodiments of this application are as follows: the test bench and test method for the plunger pump subsystem designed in this application combine the needs of functional, performance and failure verification, making them more practical; in engineering, the design parameters of some parts can be obtained more effectively and conveniently by using experimental methods. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this specification or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the test bench structure of the plunger pump subsystem of this application;

[0017] Figure 2 It is a pressure-time curve of the actively pressurized sample under test. Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0019] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as “comprising” or “including” mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as “connected” or “linked” are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as “upper,” “lower,” “left,” and “right” are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described objects changes.

[0020] The first aspect of this application provides a test bench for a plunger pump subsystem, such as... Figure 1 As shown, the system includes a back pressure source module 10, a first test module 20, and a second test module 30. The back pressure source module 10 includes a gas source 11, a pressure regulating valve 12, and a pressure boosting cylinder 13 connected by pipelines to provide a back pressure source with a constant low-pressure section and a constant high-pressure section. The first test module 20 has a first test station 21, one end of which is connected to the back pressure source module 10 via a pipeline to access the back pressure source, and the other end of which is connected to an adjustable constant pressure load device 22. The second test module 30 has a second test station 31, one end of which is connected to the back pressure source module 10 via a pipeline to access the back pressure source, and the other end of which is connected to a simulated load device 32.

[0021] Among them, the back pressure source module 10 provides an adjustable constant pressure back pressure source, the pressure regulating valve 12 is a manual precision pressure regulating valve, and the adjustable constant pressure load device 22 (0~30MPa) is realized through a manually adjustable pressure relief valve.

[0022] This application combines the needs of functional, performance and failure verification to design a test bench and test method for the plunger pump subsystem, which is more practical; in engineering, the design parameters of some parts can be obtained more effectively and conveniently by using test methods.

[0023] For example, in a test bench of the plunger pump subsystem provided in one embodiment, such as Figure 1 As shown, a first flow meter 23 and a first pressure sensor 24 are provided on the connecting pipeline between the first test station 21 and the adjustable constant pressure load device 22.

[0024] For example, in a test bench of the plunger pump subsystem provided in one embodiment, such as Figure 1 As shown, a second pressure sensor 33 is provided on the connecting pipeline between the second test station 31 and the simulated load device 32. The simulated load device 32 uses a standard hydraulic cylinder to simulate the brake wheel cylinder.

[0025] The simulated load device 32 is equipped with a pressure data acquisition module, and an exhaust screw 34 is provided at the end of the simulated load device 32.

[0026] For example, in a test bench of the plunger pump subsystem provided in one embodiment, such as Figure 1 As shown, the back pressure source module 10 also includes an oil reservoir 14, which is connected to the pneumatic booster cylinder 13. A second flow meter 15, a third pressure sensor 16, and a shut-off valve 17 are provided on the pipeline connecting the back pressure source module 10 to the first test module 20 and the second test module 30.

[0027] For example, in the test bench of the plunger pump subsystem provided in one embodiment, the back pressure source module 10 provides a back pressure source in a constant low pressure range of 0.1MPa to 0.8MPa and a back pressure source in a constant high pressure range of 1MPa to 20MPa.

[0028] The second aspect of this application provides a test method for a plunger pump subsystem, used for negative pressure failure testing of the decompression function of the plunger pump subsystem, for example, for negative pressure failure testing of the ABS / ESC decompression function. Figure 1 As shown, it includes the following steps:

[0029] The sample M to be tested is placed in the first station 21, and the oil outlet of the sample M to be tested is connected to the back pressure source module 10 to access the back pressure source to simulate the wheel cylinder. The oil inlet of the sample M to be tested is connected to the adjustable constant pressure load device 22 to simulate the master cylinder.

[0030] In the low-pressure range, the constant pressure back pressure source is adjusted from high to low until it reaches 1 atmosphere (0.1 MPa). If the first flow meter 23 detects a stable load output at a back pressure of 0.1 MPa, it indicates that the tested sample system has a risk of failure due to negative pressure in the wheel cylinder.

[0031] For example, in a test method for the plunger pump subsystem provided in one embodiment, the oil pumping capacity test for the decompression function of the plunger pump subsystem is used, for example, for the oil pumping capacity test for the decompression function of the ABS / ESC system. Figure 1 As shown, it includes the following steps:

[0032] The sample M to be tested is placed in the first station 21, and the oil outlet of the sample M to be tested is connected to the back pressure source module 10 to access the back pressure source to simulate the wheel cylinder. The oil inlet of the sample M to be tested is connected to the adjustable constant pressure load device 22 to simulate the master cylinder.

[0033] Given a constant pressure back pressure source and a constant pressure load, under these conditions, the pumping efficiency of the motor plunger pump is reflected by the value of the first flow meter 23. This is used to verify the influence of changes in the design parameters of various parts of the plunger pump subsystem, such as: inlet spring, outlet spring, motor power characteristics, eccentricity, plunger pump diameter, throttling effect of suction valve, and accumulator check valve spring.

[0034] For example, in a test method for the plunger pump subsystem provided in one embodiment, the motor pump capability test for the active boost function of the plunger pump subsystem, for example, the motor pump capability test for the ESC active boost function, such as... Figure 1 As shown, it includes the following steps:

[0035] The ESC test sample M is placed at the first station 21, and the oil inlet of the ESC test sample M is connected to the back pressure source module 10 to access the back pressure source to simulate the main cylinder. The oil outlet of the ESC test sample M is connected to the adjustable constant pressure load device 22 to simulate the wheel cylinder.

[0036] Given a constant pressure back pressure source and a constant pressure load, under these conditions, the active boosting efficiency of the motor plunger pump is verified by using the numerical response of the first flow meter 23, thereby verifying the impact of changes in the design parameters of each component of the plunger pump subsystem.

[0037] Table 1 below shows the comparative test data of active booster flow rate of ESC test sample M with reference samples A and B:

[0038] Table 1. ESC Active Boost Constant 10MPa Flow Rate Test

[0039]

[0040] For example, in a test method for the plunger pump subsystem provided in one embodiment, the pressure build-up time test for the active pressurization function of the plunger pump subsystem, for example, the pressure build-up time test for the ESC active pressurization function, such as... Figure 1 As shown, it includes the following steps:

[0041] The ESC test sample M is placed in the second station 31, and the oil inlet of the ESC test sample M is connected to the back pressure source module 10 to access the back pressure source to simulate the main cylinder. The oil outlet of the ESC test sample M is connected to the simulated load device 32 to simulate the wheel cylinder.

[0042] Given a constant pressure back pressure source, the active pressure build-up time of the standard set pressure is obtained through the pressure-time curve of the data acquisition system based on the standard PV characteristic curve of the simulated load device 32 and the pressure-time curve of the data acquisition system.

[0043] The pressure-time curve of the actively pressurized ESC test sample M is as follows: Figure 2 As shown.

[0044] For example, in a test method for the plunger pump subsystem provided in one embodiment, the reliable opening capability test of the main valve of the plunger pump subsystem's suction valve is performed, such as... Figure 1 As shown, it includes the following steps:

[0045] The ESC test sample M is placed at the first station 21, and the oil inlet of the ESC test sample M is connected to the back pressure source module 10 to access the back pressure source to simulate the main cylinder. The oil outlet of the ESC test sample M is connected to the adjustable constant pressure load device 22 to simulate the wheel cylinder.

[0046] In the high-pressure section, the constant pressure back pressure source is adjusted from low to high, and the value and change of the first flow meter 23 are used to determine whether the main valve of the suction valve can be reliably opened.

[0047] Although the embodiments of this application have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this application. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this application is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A test bench for a plunger pump subsystem, characterized in that, Negative pressure failure test for the pressure reduction function of the plunger pump subsystem, oil pumping capacity test for the pressure reduction function, pumping capacity test for the active boosting function, pressure build-up time test for the active boosting function, and reliable opening capability test for the main valve of the suction valve, including: The back pressure source module includes a gas source, a pressure regulating valve, and a gas pressure boosting cylinder connected by pipelines to provide a back pressure source in a constant low-pressure section and a back pressure source in a constant high-pressure section. The first test module has a first test station. One end of the first test station is connected to the back pressure source module through a pipeline to access the back pressure source. The other end of the first test station is connected to an adjustable constant pressure load device. A first flow meter and a first pressure sensor are provided on the connecting pipeline between the first test station and the adjustable constant pressure load device. The second test module has a second test station. One end of the second test station is connected to the back pressure source module through a pipeline to access the back pressure source, and the other end of the second test station is connected to a simulated load device.

2. The test bench for the plunger pump subsystem according to claim 1, characterized in that, A second pressure sensor is installed on the connecting pipeline between the second test station and the simulated load device, and the simulated load device uses a standard hydraulic cylinder to simulate a brake wheel cylinder.

3. The test bench for the plunger pump subsystem according to claim 1, characterized in that, The back pressure source module also includes an oil reservoir connected to the pneumatic booster cylinder. A second flow meter, a third pressure sensor, and a shut-off valve are provided on the pipeline connecting the back pressure source module to the first test module and the second test module.

4. The test bench for the plunger pump subsystem according to claim 1, characterized in that, The back pressure source module provides a back pressure source in the constant low pressure range of 0.1MPa to 0.8MPa and a back pressure source in the constant high pressure range of 1MPa to 20MPa.

5. The test method for the test bench of the plunger pump subsystem according to any one of claims 1-4, characterized in that, Negative pressure failure testing for the decompression function of a plunger pump subsystem includes the following steps: The sample to be tested is placed at the first test station, and the oil outlet of the sample to be tested is connected to the back pressure source module to access the back pressure source to simulate the wheel cylinder. The oil inlet of the sample to be tested is connected to the adjustable constant pressure load device to simulate the master cylinder. In the low-pressure range, the constant pressure back pressure source is adjusted from high to low until it reaches 1 atmosphere (0.1 MPa). If the first flow meter detects a stable load output at a back pressure of 0.1 MPa, it indicates that the tested sample system has a risk of failure due to negative pressure in the wheel cylinder.

6. The test method for the test bench of the plunger pump subsystem according to any one of claims 1-4, characterized in that, The test of the pumping capacity of the motor for the pressure reduction function of the plunger pump subsystem includes the following steps: The sample to be tested is placed at the first test station, and the oil outlet of the sample to be tested is connected to the back pressure source module to access the back pressure source to simulate the wheel cylinder. The oil inlet of the sample to be tested is connected to the adjustable constant pressure load device to simulate the master cylinder. Given a constant pressure back pressure source and a constant pressure load, under these conditions, the pumping efficiency of the motor plunger pump is reflected by the first flow count value, thereby verifying the impact of changes in the design parameters of each component of the plunger pump subsystem.

7. The test method for the test bench of the plunger pump subsystem according to any one of claims 1-4, characterized in that, The pump capability test for the active booster function of the plunger pump subsystem includes the following steps: The sample to be tested is placed at the first test station, and the oil inlet of the sample to be tested is connected to the back pressure source module to access the back pressure source to simulate the main cylinder. The oil outlet of the sample to be tested is connected to the adjustable constant pressure load device to simulate the wheel cylinder. Given a constant pressure back pressure source and a constant pressure load, under these conditions, the active boosting efficiency of the motor plunger pump is reflected by the first flow count value, thereby verifying the impact of changes in the design parameters of each component of the plunger pump subsystem.

8. The test method for the test bench of the plunger pump subsystem according to any one of claims 1-4, characterized in that, The pressure build-up time test for the active boost function of the plunger pump subsystem includes the following steps: The sample to be tested is placed in the second test station, and the oil inlet of the sample to be tested is connected to the back pressure source module to connect to the back pressure source to simulate the main cylinder. The oil outlet of the sample to be tested is connected to the simulated load device to simulate the wheel cylinder. Given a constant pressure back pressure source, the active pressure build-up time of the standard set pressure is obtained through the pressure-time curve of the data acquisition system based on the standard PV characteristic curve of the simulated load device.

9. The test method for the test bench of the plunger pump subsystem according to any one of claims 1-4, characterized in that, The following steps are included in the test of the reliable opening capability of the main valve of the suction valve in a plunger pump subsystem: The sample to be tested is placed at the first test station, and the oil inlet of the sample to be tested is connected to the back pressure source module to access the back pressure source to simulate the main cylinder. The oil outlet of the sample to be tested is connected to the adjustable constant pressure load device to simulate the wheel cylinder. In the high-pressure section, the constant pressure back pressure source is adjusted from low to high, and the main valve of the suction valve is reliably opened by observing the first flow count value and its change.

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