Test Method and System for Secondary Air Pumps in Passenger Vehicles

Abstract

This application provides a testing method and system for a secondary air pump in a passenger vehicle. The testing method includes: setting test parameters for the secondary air pump; starting the secondary air pump; obtaining the current, airflow, pressure, and flow rate values ​​of the secondary air pump according to the test parameters; plotting a relationship curve between the pressure and flow rate values; determining whether the secondary air pump is preliminarily qualified based on the current, airflow, and relationship curve; in response to the preliminary qualification of the secondary air pump, obtaining the maximum current, maximum airflow, and maximum pressure values ​​during the test; and determining whether the secondary air pump is ultimately qualified based on the maximum current, maximum airflow, and maximum pressure values.

Description

Technical Field

[0001] This application relates to the field of automated testing of complete machines, and more specifically, to a testing method and system for a secondary air pump in a passenger vehicle. Background Technology

[0002] The secondary air pump system is one of the external purification devices for reducing exhaust emissions. Its function is to supply air to the three-way catalytic converter when the engine is cold. By blowing additional air (secondary air) into the exhaust gas, the oxygen content is increased. The exhaust gas then undergoes secondary combustion upon contact with the oxygen in the air, raising the temperature of the three-way catalytic converter and causing unburned harmful substances such as carbon monoxide (CO) and hydrocarbons (HC) in the exhaust gas to burn again under high-temperature conditions. Furthermore, the secondary air pump system only needs to operate for a maximum of five minutes to bring the three-way catalytic converter to operating temperature as soon as possible, reducing harmful substances in the exhaust gas and thus contributing to environmental protection.

[0003] During the cold start phase of the engine, the emissions of unburned hydrocarbons and carbon monoxide are relatively high, and the three-way catalytic converter has not yet reached its operating temperature (above 300 degrees Celsius).

[0004] Therefore, when the vehicle emission standards need to meet EU3 or EU4 requirements, this external purification device—the secondary air system—must be equipped to reduce the emission of harmful substances during the engine cold start phase; on the other hand, the heat from the second combustion can allow the three-way catalytic converter to quickly reach the required operating temperature.

[0005] Therefore, to ensure the safety, functionality, and robustness of the control and protection system of the secondary air pump system, a comprehensive test must be conducted on the secondary air pump system during factory testing.

[0006] However, this product is not currently in mass production, and there is a lack of a mature or established testing system for secondary air pump systems. At present, the common testing of this product is still in the rudimentary stage of using manual temporary components and manual stopwatch timing. This has problems such as cumbersome circuit and air path assembly, non-standard installation of testing instruments (sensors), large interference from human factors, inconsistent testing conditions, inability to achieve automated system testing, and data processing issues.

[0007] Therefore, it is necessary to propose a test method and system for secondary air pumps in passenger vehicles to simplify the complexity of the test circuit and operation.

[0008] The information disclosed in the background section is only intended to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0009] This application aims to provide a test method and system for secondary air pumps in passenger vehicles, so as to simplify the complexity of test circuits and operation.

[0010] According to one aspect of this application, a testing method for a secondary air pump is proposed, comprising:

[0011] Set the test parameters for the secondary air pump;

[0012] Start the secondary air pump;

[0013] The current, air volume, pressure, and flow rate of the secondary air pump are obtained by testing the test parameters.

[0014] Plot a relationship curve between the pressure value and the flow rate value;

[0015] The secondary air pump is preliminarily qualified based on the current value, the air volume value, and the relationship curve.

[0016] In response to the preliminary qualification of the secondary air pump, the maximum current value, maximum air volume value and maximum pressure value during the test of the secondary air pump are obtained;

[0017] The final qualification of the secondary air pump is determined based on the maximum current value, the maximum air volume value, and the maximum pressure value.

[0018] According to some embodiments, the test parameters of the secondary air pump include current parameters, flow rate parameters, pressure parameters, and the operating time of the secondary air pump.

[0019] According to some embodiments, determining whether the secondary air pump is preliminarily qualified based on the current value, the air volume value, and the relationship curve includes:

[0020] If, during the first time period, the current value is stable within the first interval, the air volume value is stable within the second interval, and the relationship curve conforms to the third interval, then the secondary air pump is determined to be initially qualified.

[0021] According to some embodiments, determining whether the secondary air pump is ultimately qualified based on the maximum current value, the maximum air volume value, and the maximum pressure value includes:

[0022] If the maximum current value is in the fourth range, the maximum air volume value is in the fifth range, and the maximum pressure value is in the sixth range, then the secondary air pump is determined to be finally qualified.

[0023] According to a second aspect of this application, a secondary air pump testing system is proposed, comprising a processing unit, a data acquisition card, an airflow meter, a pressure sensor, and a current sensor, wherein:

[0024] The data acquisition card is connected to the air volume flow meter, the pressure sensor, and the current sensor respectively, and is used to acquire the air volume signal and flow signal of the air volume flow meter, the pressure signal of the pressure sensor, and the current signal of the current sensor, and convert them into air volume value, flow value, pressure value, and current value.

[0025] The processing unit is connected to the acquisition card and is used to acquire the air volume value, the flow rate value, the pressure value, and the current value. Based on the air volume value, the flow rate value, the pressure value, and the current value, it determines whether the secondary air pump is initially qualified. The processing unit is also used to determine the maximum current value, the maximum air volume value, and the maximum pressure value in the secondary air pump testing system in response to the initial qualification of the secondary air pump. Based on the maximum current value, the maximum air volume value, and the maximum pressure value, it determines whether the secondary air pump is ultimately qualified.

[0026] According to some embodiments, the processing unit determines the relationship between the flow rate value and the pressure value.

[0027] According to some embodiments, the processing unit is further configured to determine that the secondary air pump is initially qualified if, during a first time period, the current value is stable in a first interval, the air volume value is stable in a second interval, and the relationship between the flow rate value and the pressure value conforms to a third interval.

[0028] According to some embodiments, the processing unit is also used to determine that the secondary air pump is finally qualified when the maximum current value is in the fourth interval, the maximum air volume value is in the fifth interval, and the maximum pressure value is in the sixth interval.

[0029] According to some embodiments, it also includes:

[0030] A shut-off valve, which is connected to the secondary air pump, is used to control the opening and closing of the secondary air pump.

[0031] According to some embodiments, it also includes:

[0032] The test power supply, which is connected to the current sensor, is used to supply power to the secondary air pump.

[0033] According to some embodiments, the air volume flow meter is installed at the air path pipeline of the secondary air pump, the pressure sensor is installed downstream of the air volume flow meter at a position where the pipe diameter is greater than a first threshold, and the shut-off valve is installed behind the pressure sensor.

[0034] According to a third aspect of this application, a passenger vehicle is proposed, including a secondary air pump testing system as described in any one of the second aspects.

[0035] This application provides a test method and system for a passenger vehicle secondary air pump. The test system includes a test power supply, instruments and other circuit components, as well as a fixed installation for the air circuit. This allows for convenient and quick installation of the product under test and ensures uniformity of test hardware conditions.

[0036] The test system of this application has a DC power supply with a wide range of adjustable output voltage levels, an air volume meter, and a high-precision current sensor, which can be used to test various types of secondary air pump systems.

[0037] The testing system described in this application is an automated complete set of equipment. The product under test can be directly connected to the test power supply and air circuit, eliminating the need for the start-up circuit and switch circuit of the valve under test, as well as the corresponding start-up and charging steps, thus greatly simplifying the complexity of the test circuit and operation.

[0038] This application uses a computer and data acquisition system to automatically collect and process test parameters, perform tests according to the established testing process and requirements, and display and save data results, greatly simplifying the operation.

[0039] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this application. Attached Figure Description

[0040] The above and other objects, features, and advantages of this application will become more apparent from the detailed description of exemplary embodiments with reference to the accompanying drawings. The drawings described below are merely some embodiments of this application and are not intended to limit the scope of this application.

[0041] Figure 1 A schematic diagram of a passenger vehicle secondary air pump test system of an exemplary embodiment is shown;

[0042] Figure 2 A schematic diagram of a passenger vehicle secondary air pump test system is shown as an exemplary embodiment.

[0043] Figure 3 A control diagram of an automated testing system for a secondary air pump in a passenger vehicle, illustrating an exemplary embodiment, is shown.

[0044] Figure 4 A schematic diagram of the air circuit connection of an automated testing system for a secondary air pump (fan) in a passenger vehicle, illustrating an exemplary embodiment;

[0045] Figure 5 A flowchart illustrating an exemplary embodiment of an automated testing system for a passenger vehicle secondary air pump is provided. Detailed Implementation

[0046] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this application will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted.

[0047] The described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a full understanding of embodiments of this disclosure. However, those skilled in the art will recognize that the technical solutions of this disclosure can be practiced without one or more of these specific details, or other methods, components, materials, devices, etc. In these cases, well-known structures, methods, devices, implementations, materials, or operations will not be shown or described in detail.

[0048] The flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all content and operations / steps, nor do they necessarily have to be performed in the described order. For example, some operations / steps can be broken down, while others can be combined or partially combined; therefore, the actual execution order may change depending on the specific circumstances.

[0049] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0050] Those skilled in the art will understand that the accompanying drawings are merely schematic diagrams of exemplary embodiments, and the modules or processes in the drawings are not necessarily essential for implementing this application, and therefore cannot be used to limit the scope of protection of this application.

[0051] Figure 1 A schematic diagram of a passenger vehicle secondary air pump test system is shown as an exemplary embodiment.

[0052] like Figure 1 The figure shown is an overall appearance view of the automated testing system for a passenger vehicle secondary air pump (fan) according to this application. The passenger vehicle secondary air pump testing system includes a test power supply, the secondary air pump under test, an airflow meter, a pressure sensor, a current sensor, an electric shut-off valve, an operating table, and connecting pipelines.

[0053] According to the example embodiment, in this application, the test power supply is an input AC220V, an output DC0-20V, a maximum current of 100A, and an adjustable voltage amplitude; the control board is a data acquisition card, including 4 analog inputs and 8 digital inputs / outputs; the airflow meter is an orifice plate flow meter with a maximum range of 120m³. 3 The system operates at / h, powered by DC24V, with analog signal output of 0-5V; the current sensor is a high-sensitivity Hall-effect current sensor with a serial port; the electric shut-off valve is an AC 220V normally open electric ball valve with a switching time of approximately 10 seconds. However, this application uses only this as an example, and the automated testing system for the entire secondary air pump (fan) of passenger vehicles is not limited to this.

[0054] The test system of this application has a DC power supply with a wide range of adjustable output voltage levels, an air volume meter, and a high-precision current sensor, which can be used to test various types of secondary air pump systems.

[0055] The testing system described in this application is an automated complete set of equipment. The product under test can be directly connected to the test power supply and air circuit, eliminating the need for the start-up circuit and switch circuit of the valve under test, as well as the corresponding start-up and charging steps, thus greatly simplifying the complexity of the test circuit and operation.

[0056] Figure 2 A schematic diagram of a passenger vehicle secondary air pump test system is shown as an exemplary embodiment.

[0057] like Figure 2 As shown, the passenger vehicle secondary air pump test system includes a data acquisition card 201, a shut-off valve 202, an airflow meter 203, a pressure sensor 204, a current sensor 205, a secondary air pump 206, a test power supply 207, and a processing unit 208.

[0058] According to the example embodiment, the data acquisition card 201 is connected to the shut-off valve 202, the shut-off valve 202 is connected to the air volume flow meter 203 and the pressure sensor 204 respectively, and the data acquisition card 201 is connected to the air volume flow meter 203, the pressure sensor 204 and the current sensor 205 respectively. It is used to acquire the air volume signal, flow signal, pressure signal and current signal of the secondary air pump 206 and convert them into air volume value, flow value, pressure value and current value. The data acquisition card 201 controls the opening and closing of the shut-off valve 202 to realize the opening and closing of the secondary air pump 206. The test power supply 207 is connected to the current sensor 205. The shut-off valve 202 is connected to the secondary air pump 206 to shut off the air pipeline so as to detect the pressure value of the secondary air pump 206 when the flow is cut off.

[0059] According to the example embodiment, the processing unit 208 is connected to the data acquisition card 201 to acquire air volume, flow rate, pressure, and current values. During the first time period, if the processing unit 208 detects that the current value is stable within a first range, the air volume value is stable within a second range, and the relationship curve between the flow rate and pressure value conforms to a third range, then the secondary air pump is preliminarily deemed qualified.

[0060] According to the example embodiment, the processing unit 208 is also used to obtain the maximum current value, maximum air volume value, and maximum pressure value during the secondary air pump test system test. Furthermore, if the maximum current value is in the fourth interval, the maximum air volume value is in the fifth interval, and the maximum pressure value is in the sixth interval, the secondary air pump is determined to be ultimately qualified.

[0061] In the main circuit connection section, the test power supply 207 is connected to the current sensor 205 to supply power to the secondary air pump 206 of the product under test; the output voltage and current of the test power supply 207 can be adjusted according to actual needs to better meet the test requirements.

[0062] According to the example embodiment, the power supply voltage is set to approximately 12V, the operating current is approximately 40A, and the starting current is approximately 70A. The operating power supply of the shut-off valve 202 is AC220V, and the opening and closing of the test power supply 207 is controlled by the data acquisition card 201.

[0063] According to the example embodiment, the air volume flow meter 203, pressure sensor 204, and current sensor 205 operate on a DC24V power supply and output electrical signals to the data acquisition card 201. The data acquisition card 201 communicates and transmits data with the host computer of the passenger vehicle secondary air pump test system. The system display terminal displays data, charts, curves, etc.

[0064] This application provides a test method and system for a passenger vehicle secondary air pump. The test system includes a test power supply, instruments and other circuit components, as well as a fixed installation for the air circuit. This allows for convenient and quick installation of the product under test and ensures uniformity of test hardware conditions.

[0065] The test system of this application has a DC power supply with a wide range of adjustable output voltage levels, an air volume meter, and a high-precision current sensor, which can be used to test various types of secondary air pump systems.

[0066] The testing system described in this application is an automated complete set of equipment. The product under test can be directly connected to the test power supply and air circuit, eliminating the need for the start-up circuit and switch circuit of the valve under test, as well as the corresponding start-up and charging steps, thus greatly simplifying the complexity of the test circuit and operation.

[0067] Figure 3 A control diagram of an automated testing system for a secondary air pump in a passenger vehicle, illustrating an exemplary embodiment, is shown.

[0068] S301, Start the software;

[0069] S302, Detect whether a USB device data acquisition card (controller) is connected;

[0070] S309: If the data acquisition card is not detected, the system will not run and will exit directly, ending the test.

[0071] After detecting the data acquisition card (controller), S303 starts the program;

[0072] S304 sets test parameters in the software system and drives the data acquisition card (controller) to acquire signals;

[0073] S305: The system receives data from AD devices, i.e., the electronic product development system, and displays it on the system interface;

[0074] S306, the system continues to send test commands to the lower-level machine, the lower-level machine communicates with the system, and at the same time detects and provides feedback on whether the system has any action commands;

[0075] S307 The system processes the signal data collected by the lower-level machine according to the design requirements and displays it on the human-machine interface, such as the signal indication status, curve plotting, program execution process and final test results.

[0076] S308, the test ends after all data has been acquired.

[0077] This application uses a computer and data acquisition system to automatically collect and process test parameters, perform tests according to the established testing process and requirements, and display and save data results, greatly simplifying the operation.

[0078] Figure 4 A schematic diagram of the air circuit connection of an automated testing system for a secondary air pump (fan) in a passenger vehicle, illustrating an exemplary embodiment, is shown.

[0079] like Figure 4 As shown, the air volume flow meter 203 is installed at the air line of the secondary air pump 206, and the pressure sensor 204 is installed downstream of the air volume flow meter 203 at a position where the pipe diameter is greater than the first threshold. In this application, a pipe diameter of 5 times is used as an example. A shut-off valve 202 is set on the back side of the pressure sensor 204 to shut off the air line so as to detect the pressure value of the secondary air pump when the flow is cut off.

[0080] According to some embodiments, the requirements for the gas pipeline are: the gas pipeline diameter is consistent with the diameter of the air flow meter 203, and the distance between the gas pipeline diameter and the fluid medium above the gas flow meter is at least 10 times the pipe diameter; the distance between the gas pipeline diameter and the fluid medium below the gas flow meter is at least 5 times the pipe diameter.

[0081] This application provides a test method and system for a passenger vehicle secondary air pump. The test system includes a test power supply, instruments and other circuit components, as well as a fixed installation for the air circuit. This allows for convenient and quick installation of the product under test and ensures uniformity of test hardware conditions.

[0082] Figure 5 A flowchart illustrating an exemplary embodiment of an automated testing system for a passenger vehicle secondary air pump is provided.

[0083] S501, set test parameters.

[0084] According to the example embodiment, the automated testing system for the secondary air pump of a passenger vehicle sets test parameters, including parameters such as current, flow rate, and air pressure, and also sets the system running time.

[0085] S502, start the secondary air pump.

[0086] According to the example embodiment, the secondary air pump system is started, and the test begins according to the set parameters such as current, flow rate, and air pressure.

[0087] S503 obtains current, air volume, pressure, and flow rate values.

[0088] According to the example embodiment, after the secondary air pump system is started, the current value, air volume value, pressure value and flow rate value of the system are detected, and the relationship curve between pressure value and flow rate value is plotted.

[0089] S504, determine whether the secondary air pump is initially qualified.

[0090] According to the example embodiment, within a specified time range, the secondary air pump is preliminarily qualified based on the relationship curves of current value, air volume value, and pressure value with flow rate value; if the current value is stable in the first range, the air volume value is stable in the second range, and the relationship curve of pressure value with flow rate value meets the system standard range requirements of the third range, then the passenger car secondary air pump is preliminarily qualified.

[0091] S505, the shut-off valve is activated, shutting off the system.

[0092] According to the example embodiment, when the system's set running time is reached, the shut-off valve operates, and the system shuts down.

[0093] S506, obtains the maximum current value, maximum air volume value, and maximum pressure value.

[0094] According to the example embodiment, the maximum current value, maximum air volume value, and maximum pressure value of the system are obtained during the test.

[0095] S507, determine whether the secondary air pump is ultimately qualified.

[0096] The system's maximum current, maximum airflow, and maximum pressure values ​​are compared with the system's standard values. If the maximum current value is in the fourth range, the maximum airflow value is in the fifth range, and the maximum pressure value is in the sixth range, meeting the system test requirements, then the passenger vehicle secondary air pump is qualified.

[0097] This application uses a computer and data acquisition system to automatically collect and process test parameters, perform tests according to the established testing process and requirements, and display and save data results, greatly simplifying the operation.

[0098] It should be clearly understood that this application describes how specific examples are formed and used, but this application is not limited to any details of these examples. Rather, based on the teachings of the disclosure of this application, these principles can be applied to many other embodiments.

[0099] Furthermore, it should be noted that the above figures are merely illustrative representations of the processes included in the method according to exemplary embodiments of this application, and are not intended to be limiting. It is readily understood that the processes shown in the above figures do not indicate or limit the temporal order of these processes. Additionally, it is readily understood that these processes may be executed synchronously or asynchronously, for example, in multiple modules.

[0100] Exemplary embodiments of this application have been specifically shown and described above. It should be understood that this application is not limited to the detailed structures, arrangements, or implementation methods described herein; rather, this application is intended to cover various modifications and equivalent arrangements contained within the spirit and scope of the appended claims.

Claims

1. A method of testing a secondary air pump, the method comprising: include: Set the test parameters for the secondary air pump; Start the secondary air pump; The current, air volume, pressure, and flow rate of the secondary air pump are obtained by testing the test parameters. Plot a relationship curve between the pressure value and the flow rate value; Determining whether the secondary air pump is initially qualified based on the current value, the air volume value, and the relationship curve includes: If, during the first time period, the current value is stable in the first interval, the air volume value is stable in the second interval, and the relationship curve conforms to the third interval, the secondary air pump is determined to be initially qualified. In response to the preliminary qualification of the secondary air pump, the maximum current value, maximum air volume value and maximum pressure value during the test of the secondary air pump are obtained; The final qualification of the secondary air pump is determined based on the maximum current value, the maximum air volume value, and the maximum pressure value.

2. The test method of claim 1, wherein, The test parameters for the secondary air pump include current parameters, flow rate parameters, pressure parameters, and the operating time of the secondary air pump.

3. The test method of claim 1, wherein, The step of determining whether the secondary air pump is ultimately qualified based on the maximum current value, the maximum air volume value, and the maximum pressure value includes: If the maximum current value is in the fourth range, the maximum air volume value is in the fifth range, and the maximum pressure value is in the sixth range, then the secondary air pump is determined to be finally qualified.

4. An overfire air pump testing system, comprising: It includes a processing unit, a data acquisition card, an airflow meter, a pressure sensor, and a current sensor, among which: The data acquisition card is connected to the air volume flow meter, the pressure sensor, and the current sensor respectively, and is used to acquire the air volume signal and flow signal of the air volume flow meter, the pressure signal of the pressure sensor, and the current signal of the current sensor, and convert them into air volume value, flow value, pressure value, and current value. The processing unit is connected to the acquisition card and is used to acquire the air volume value, the flow rate value, the pressure value, and the current value. Based on the air volume value, flow rate value, pressure value, and current value, it determines whether the secondary air pump is initially qualified, including: If, during the first time period, the current value is found to be stable in the first range, the air volume value is found to be stable in the second range, and the relationship between the flow rate value and the pressure value is found to be in the third range, then the secondary air pump is determined to be initially qualified. The processing unit is also configured to, in response to the preliminary qualification of the secondary air pump, determine the maximum current value, maximum air volume value, and maximum pressure value during the test of the secondary air pump test system, and determine whether the secondary air pump is ultimately qualified based on the maximum current value, the maximum air volume value, and the maximum pressure value.

5. The test system of claim 4, wherein, The processing unit determines the relationship between the flow rate value and the pressure value.

6. The test system of claim 4, wherein, The processing unit is also used to determine that the secondary air pump is finally qualified when the maximum current value is in the fourth interval, the maximum air volume value is in the fifth interval, and the maximum pressure value is in the sixth interval.

7. The test system of claim 4, wherein, Also includes: A shut-off valve, which is connected to the secondary air pump, is used to control the opening and closing of the secondary air pump.

8. The test system of claim 4, wherein, Also includes: The test power supply, which is connected to the current sensor, is used to supply power to the secondary air pump.

9. The testing system as described in claim 7, characterized in that, The air volume flow meter is installed at the air pipeline of the secondary air pump, the pressure sensor is installed downstream of the air volume flow meter where the pipe diameter is greater than the first threshold, and the shut-off valve is installed behind the pressure sensor.

10. A passenger vehicle, characterized in that, Includes the secondary air pump testing system as described in any one of claims 4-9.

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