Avu valve durability test system and method

Abstract

The application provides an AVU valve durability test system and method, and belongs to the technical field of automobile engine testing. The system comprises: a thermostat having an internal space for accommodating the AVU valve; a gas receiving container connected with the AVU valve pipeline; a control unit electrically connected with the AVU valve, used for receiving a pressure regulation durability test instruction, obtaining a pressure regulation test input parameter based on the pressure regulation durability test instruction, and generating a pressure regulation control signal based on the pressure regulation test input parameter; and a load tank connected with the AVU valve pipeline and the thermostat pipeline, used for providing a pressure load for the AVU valve in the thermostat when the AVU valve is opened or closed under the drive of the pressure regulation test input parameter and the pressure regulation control signal.

Description

Technical Field

[0001] This invention relates to the field of automotive engine testing technology, specifically to an AVU valve durability testing system and method. Background Technology

[0002] The AVU (Air Valve Unit) is the compressed air control unit of an engine, controlling pneumatic components such as the turbocharger bleed valve and turbocharger brake valve. Its reliability is paramount. Existing single-product durability testing methods include environmental conditions, valve control cycles and operating time, and performance testing requirements. This valve technology is imported, and the reliability of AVU valve applications is limited by this import. Therefore, single-product reliability verification technology, which addresses changes in application scenarios, is crucial. Currently, single-product durability testing for AVU valves is available only to a few suppliers. AVU valve application scenarios are based on supplier design conditions; applications exceeding these conditions are rarely supported by suppliers. AVU valve application testing can only be conducted under complete engine conditions or on the user's vehicle, resulting in high costs, long cycles, and significant risks. Therefore, existing technologies lack the technical expertise for single-product durability testing of AVU valves. Summary of the Invention

[0003] In view of this, it is necessary to provide an AVU valve durability testing system and method to solve the technical problem of the lack of durability testing for individual AVU valves in the prior art.

[0004] To address the aforementioned technical problems, this invention provides an AVU valve durability testing system, comprising:

[0005] A constant temperature chamber having an internal space to accommodate the AVU valve;

[0006] A gas receiving container is connected to the AVU valve pipeline;

[0007] The control unit, electrically connected to the AVU valve, receives pressure regulation durability test commands, acquires pressure regulation test input parameters based on the commands, generates a pressure regulation control signal, and drives the AVU valve to open or close based on the input parameters and the control signal. The pressure regulation control signal includes the pressure regulation duty cycle, time, and number of cycles. The pressure regulation test input parameters include the pressure regulation value and the pressure regulation cycle stage.

[0008] The load cell, connected to the AVU valve pipeline and the thermostat pipeline, is used to provide a pressure load to the AVU valve in the thermostat when the pressure regulating test input parameters and pressure regulating control signals drive the AVU valve to open or close.

[0009] In one possible implementation,

[0010] The control unit is also used to receive leakage measurement durability test commands and drive the AVU valve to open or close based on the leakage measurement durability test commands;

[0011] The leak meter, connected to the AVU valve pipeline and the thermostat pipeline, is used to measure the gas leaking from the thermostat when the AVU valve is open or closed.

[0012] On the other hand, the present invention also provides a durability testing method for an AVU valve, comprising:

[0013] The control unit receives the pressure regulation durability test command, obtains the pressure regulation test input parameters based on the command, generates a pressure regulation control signal based on the input parameters, and drives the AVU valve to open or close based on the input parameters and control signal. The pressure regulation control signal includes the pressure regulation duty cycle, time, and number of cycles. The pressure regulation test input parameters include the pressure regulation value and the pressure regulation cycle stage.

[0014] The load cell provides a pressure load to the AVU valve in the thermostatic chamber when the AVU valve is opened or closed.

[0015] In one possible implementation, the method further includes:

[0016] The control unit receives the leakage measurement durability test command and drives the AVU valve to open or close based on the leakage measurement durability test command;

[0017] The leak meter measures the gas leaking from the AVU valve when the AVU valve is open or closed, and is placed in a constant temperature chamber.

[0018] In one possible implementation

[0019] The control unit receives the pressure regulation durability test command of the AVU's pressure regulating valve or switching valve, obtains the pressure regulation test input parameters of the AVU's pressure regulating valve or switching valve based on the durability test command, generates the pressure regulation control signal of the AVU's pressure regulating valve or switching valve based on the pressure regulation test input parameters of the AVU's pressure regulating valve or switching valve, and drives the AVU valve to open or close based on the pressure regulation test input parameters of the AVU's pressure regulating valve or switching valve and the pressure regulation control signal of the AVU's pressure regulating valve or switching valve.

[0020] In one possible implementation, the durability test command for the pressure regulating valve or switching valve based on the AVU acquires the pressure regulating test input parameters of the pressure regulating valve or switching valve of the AVU, and generates a pressure regulating control signal for the pressure regulating valve or switching valve of the AVU based on the pressure regulating test input parameters of the pressure regulating valve or switching valve of the AVU, including:

[0021] The durability test command of the pressure regulating valve based on the AVU obtains the first parameter of the pressure regulating test of the pressure regulating valve of the AVU, and generates the first pressure regulating control signal of the pressure regulating valve of the AVU based on the first parameter of the pressure regulating test of the pressure regulating valve of the AVU.

[0022] The durability test command of the pressure regulating valve based on the AVU obtains the second parameter of the pressure regulating test input of the pressure regulating valve of the AVU, and generates the second pressure regulating control signal of the pressure regulating valve of the AVU based on the second parameter of the pressure regulating test input of the pressure regulating valve of the AVU.

[0023] The durability test command of the pressure regulating valve based on the AVU obtains the third parameter of the pressure regulating test input of the pressure regulating valve of the AVU, and generates the third pressure regulating control signal of the pressure regulating valve of the AVU based on the third parameter of the pressure regulating test input of the pressure regulating valve of the AVU.

[0024] The durability test command of the pressure regulating valve based on the AVU obtains the fourth parameter of the pressure regulating test input of the pressure regulating valve of the AVU, and generates the fourth pressure regulating control signal of the pressure regulating valve of the AVU based on the fourth parameter of the pressure regulating test input of the pressure regulating valve of the AVU.

[0025] The values ​​of the first, second, third, and fourth parameters of the pressure regulating valve input for the AVU are different.

[0026] In one possible implementation

[0027] The durability test command of the switching valve based on the AVU obtains the first parameter of the pressure regulation test of the switching valve based on the AVU, and generates the first pressure regulation control signal of the switching valve based on the first parameter of the pressure regulation test of the switching valve based on the AVU.

[0028] The durability test command of the switching valve based on the AVU obtains the second parameter of the pressure regulation test input of the switching valve based on the AVU, and generates the second pressure regulation control signal of the switching valve based on the second parameter of the pressure regulation test input of the switching valve based on the AVU.

[0029] The durability test command of the switching valve based on the AVU obtains the third parameter of the pressure regulation test input of the switching valve based on the AVU, and generates the third pressure regulation control signal of the switching valve based on the third parameter of the pressure regulation test input of the switching valve based on the AVU.

[0030] The durability test command of the switching valve based on the AVU obtains the fourth parameter of the pressure regulation test input of the switching valve based on the AVU, and generates the fourth pressure regulation control signal of the switching valve based on the fourth parameter of the pressure regulation test input of the switching valve based on the AVU.

[0031] The input values ​​for the first, second, third, and fourth parameters of the pressure regulation test of the AVU's switching valve are different.

[0032] In one possible implementation, the pressure regulation test input parameters of the AVU-based pressure regulating valve or switching valve generate a pressure regulating control signal for the AVU-based pressure regulating valve or switching valve, including:

[0033] The pressure regulation test input parameters of the AVU's pressure regulating valve or switching valve generate the duty cycle control signal of the AVU's pressure regulating valve or switching valve.

[0034] In one possible implementation, the pressure regulating test input parameters of the AVU-based pressure regulating valve or switching valve and the pressure regulating control signal of the AVU-based pressure regulating valve or switching valve drive the AVU valve to open or close, including:

[0035] In the first stage of AVU pressure regulating valve control, the AVU valve is opened or closed based on the first parameter of the AVU pressure regulating valve pressure regulating test input and the first pressure regulating control signal of the AVU pressure regulating valve; the AVU valve is opened or closed based on the second parameter of the AVU pressure regulating valve pressure regulating test input and the second pressure regulating control signal of the AVU pressure regulating valve; the AVU valve is opened or closed based on the third parameter of the AVU pressure regulating valve pressure regulating test input and the third pressure regulating control signal of the AVU pressure regulating valve; and the AVU valve is opened or closed based on the fourth parameter of the AVU pressure regulating valve pressure regulating test input and the fourth pressure regulating control signal of the AVU pressure regulating valve.

[0036] In the second stage of AVU pressure regulating valve control, the AVU valve is opened or closed based on the first parameter of the AVU pressure regulating valve test input and the first pressure regulating control signal of the AVU pressure regulating valve; the AVU valve is opened or closed based on the second parameter of the AVU pressure regulating valve test input and the second pressure regulating control signal of the AVU pressure regulating valve; the AVU valve is opened or closed based on the third parameter of the AVU pressure regulating valve test input and the third pressure regulating control signal of the AVU pressure regulating valve; and the AVU valve is opened or closed based on the fourth parameter of the AVU pressure regulating valve test input and the fourth pressure regulating control signal of the AVU pressure regulating valve.

[0037] In the third stage of AVU pressure regulating valve control, the AVU valve is opened or closed based on the first parameter of the AVU pressure regulating valve test input and the first pressure regulating control signal of the AVU pressure regulating valve; the AVU valve is opened or closed based on the second parameter of the AVU pressure regulating valve test input and the second pressure regulating control signal of the AVU pressure regulating valve; the AVU valve is opened or closed based on the third parameter of the AVU pressure regulating valve test input and the third pressure regulating control signal of the AVU pressure regulating valve; and the AVU valve is opened or closed based on the fourth parameter of the AVU pressure regulating valve test input and the fourth pressure regulating control signal of the AVU pressure regulating valve.

[0038] In the fourth stage of AVU pressure regulating valve control, the AVU valve is opened or closed based on the first parameter of the AVU pressure regulating valve test input and the first pressure regulating control signal of the AVU pressure regulating valve; the AVU valve is opened or closed based on the second parameter of the AVU pressure regulating valve test input and the second pressure regulating control signal of the AVU pressure regulating valve; the AVU valve is opened or closed based on the third parameter of the AVU pressure regulating valve test input and the third pressure regulating control signal of the AVU pressure regulating valve; and the AVU valve is opened or closed based on the fourth parameter of the AVU pressure regulating valve test input and the fourth pressure regulating control signal of the AVU pressure regulating valve.

[0039] The first, second, third, and fourth stages of AVU pressure regulating valve control are different time periods that are consecutive in time.

[0040] In one possible implementation

[0041] In the first stage of AVU switching valve control, the AVU valve is opened or closed based on the first parameter input to the AVU switching valve pressure regulation test and the first pressure regulation control signal of the AVU switching valve; the AVU valve is opened or closed based on the second parameter input to the AVU switching valve pressure regulation test and the second pressure regulation control signal of the AVU switching valve; the AVU valve is opened or closed based on the third parameter input to the AVU switching valve pressure regulation test and the third pressure regulation control signal of the AVU switching valve; and the AVU valve is opened or closed based on the fourth parameter input to the AVU switching valve pressure regulation test and the fourth pressure regulation control signal of the AVU switching valve.

[0042] In the second stage of AVU switching valve control, the AVU valve is opened or closed based on the first parameter input to the AVU switching valve pressure regulation test and the first pressure regulation control signal of the AVU switching valve; the AVU valve is opened or closed based on the second parameter input to the AVU switching valve pressure regulation test and the second pressure regulation control signal of the AVU switching valve; the AVU valve is opened or closed based on the third parameter input to the AVU switching valve pressure regulation test and the third pressure regulation control signal of the AVU switching valve; and the AVU valve is opened or closed based on the fourth parameter input to the AVU switching valve pressure regulation test and the fourth pressure regulation control signal of the AVU switching valve.

[0043] In the third stage of AVU switching valve control, the AVU valve is opened or closed based on the first parameter input to the AVU switching valve pressure regulation test and the first pressure regulation control signal of the AVU switching valve; the AVU valve is opened or closed based on the second parameter input to the AVU switching valve pressure regulation test and the second pressure regulation control signal of the AVU switching valve; the AVU valve is opened or closed based on the third parameter input to the AVU switching valve pressure regulation test and the third pressure regulation control signal of the AVU switching valve; and the AVU valve is opened or closed based on the fourth parameter input to the AVU switching valve pressure regulation test and the fourth pressure regulation control signal of the AVU switching valve.

[0044] In the fourth stage of AVU switching valve control, the AVU valve is opened or closed based on the first parameter input to the AVU switching valve pressure regulation test and the first pressure regulation control signal of the AVU switching valve; the AVU valve is opened or closed based on the second parameter input to the AVU switching valve pressure regulation test and the second pressure regulation control signal of the AVU switching valve; the AVU valve is opened or closed based on the third parameter input to the AVU switching valve pressure regulation test and the third pressure regulation control signal of the AVU switching valve; and the AVU valve is opened or closed based on the fourth parameter input to the AVU switching valve pressure regulation test and the fourth pressure regulation control signal of the AVU switching valve.

[0045] The first, second, third, and fourth stages of AVU switching valve control are different time periods that are consecutive in time.

[0046] The beneficial effects of this invention are as follows: The AVU valve durability testing system provided by this invention includes: a constant temperature chamber with an internal space to accommodate the AVU valve; a gas receiving container connected to the AVU valve pipeline; a control unit electrically connected to the AVU valve, used to receive pressure regulation durability test commands, acquire pressure regulation test input parameters based on the pressure regulation durability test commands, generate a pressure regulation control signal based on the pressure regulation test input parameters, and drive the AVU valve to open or close based on the pressure regulation test input parameters and the pressure regulation control signal; the pressure regulation control signal includes: pressure regulation duty cycle, time, and number of cycles; the pressure regulation test input parameters include: pressure regulation value and pressure regulation cycle stage; and a load tank connected to the AVU valve pipeline and the constant temperature chamber pipeline, used to provide a pressure load to the AVU valve in the constant temperature chamber when the pressure regulation test input parameters and the pressure regulation control signal drive the AVU valve to open or close. This invention creatively integrates a high-pressure, dry air, temperature chamber, load switching, and leakage meter into a single AVU valve testing system, which can achieve the purpose of AVU valve durability testing. Attached Figure Description

[0047] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0048] Figure 1 This is a schematic diagram of an embodiment of the AVU valve durability testing system provided by the present invention;

[0049] Figure 2 A schematic diagram of an embodiment of the AVU valve durability testing system provided by the present invention;

[0050] Figure 3 A system circuit diagram of an embodiment of the AVU valve durability testing system provided by the present invention;

[0051] Figure 4 This is a schematic flowchart of an embodiment of the AVU valve durability testing method provided by the present invention. Detailed Implementation

[0052] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0053] In the description of the embodiments of this application, unless otherwise stated, "a plurality of" means two or more.

[0054] In this embodiment of the invention, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, apparatus, product or device that includes a series of steps or modules is not necessarily limited to those steps or modules that are explicitly listed, but may include other steps or modules that are not explicitly listed or that are inherent to such process, method, product or device.

[0055] The naming or numbering of steps in the embodiments of the present invention does not mean that the steps in the method flow must be executed in the time / logical order indicated by the naming or numbering. The execution order of the named or numbered process steps can be changed according to the technical purpose to be achieved, as long as the same or similar technical effect can be achieved.

[0056] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0057] This invention provides a durability testing system and method for an AVU valve (Air Valve Unit, engine compressed air control unit) 101, which will be described below.

[0058] Figure 1 This is a schematic diagram of an embodiment of the durability testing system for the AVU valve 101 provided by the present invention, including and Figure 2 A schematic diagram of an embodiment of the AVU valve durability testing system provided by the present invention:

[0059] Thermostatic chamber 102 has an internal space to accommodate the AVU valve 101;

[0060] The gas receiving container 103 is connected to the AVU valve 101 via a pipeline;

[0061] The control unit 104, electrically connected to the AVU valve 101, is used to receive pressure regulation durability test commands, acquire pressure regulation test input parameters based on the commands, generate a pressure regulation control signal based on the input parameters, and drive the AVU valve 101 to open or close based on the input parameters and the control signal. The pressure regulation control signal includes the pressure regulation duty cycle, time, and number of cycles. The pressure regulation test input parameters include the pressure regulation value and the pressure regulation cycle stage.

[0062] The load cell 105, which is connected to the AVU valve 101 via pipeline and to the constant temperature chamber 102 via pipeline, is used to provide a pressure load to the AVU valve 101 in the constant temperature chamber 102 when the pressure adjustment test input parameters and pressure adjustment control signals drive the AVU valve 101 to open or close.

[0063] Understandably, the test environment is provided by the temperature chamber 102, and the AVU valve 101 is placed inside the temperature chamber 102 for testing.

[0064] AVU valve 101 requires compressed air supplied by an air tank and a drying assembly, which has the functions of stabilizing pressure and drying air.

[0065] Control unit 104 is controlled via a sinking interface of a PLC (Programmable Logic Controller), and the control signal is an analog PWM signal, as described below:

[0066] The PLC sink interface is used to control the PWM signal, with a maximum interface current of 0.5A. When the transistor is on, Y0 outputs a low level; when the transistor is off, Y0 outputs a 24V high level. The frequency of transistor on and off determines the frequency of the Y0 output signal, thus providing the control conditions for the PWM signal.

[0067] High-voltage PWM (Pulse Width Modulation, a digital signal composed of high and low levels) is implemented using two 24V-DC power supplies in the external circuit (high level 24V, low level 10V), thereby driving the AVU valve 101 to operate.

[0068] The PLC sinking interface can output multiple control signals, making the control circuit output consistent and sharing the same power supply.

[0069] The second pin of AVU valve 101 is the pressure regulating valve control port, and the sixth pin of AVU valve 101 is the switching valve control port. The two are switched by associated contact, that is, one normally closed contact and one normally open contact, thereby realizing the switching of valves.

[0070] The LN pin of AVU valve 101 is supplied with a voltage of 220V-AC.

[0071] The load after pressure regulation by AVU valve 101 is provided by load box 105, which is a sealed cavity of a specified volume.

[0072] When the AVU valve 101 is used for leakage detection, the leakage meter 201 is connected by turning on the second valve.

[0073] The specific testing process for PLC cyclic program control is shown in Tables 1 and 2:

[0074] Table 1: Pressure regulating valve cycle control

[0075]

[0076] Table 2: Switching Valve Cyclic Control

[0077]

[0078] Understandably, the technical specifications for the pressure regulating valve are: PWM, high level 18.5-28.5V, low level not less than 0-10V; duty cycle range: 10%-90%; linearity: 0%-5%, 95%-100% input / output 0kPa.

[0079] Maximum output pressure: 750 kPa.

[0080] It can be further understood that the PAM analog signal in this solution is implemented using a PLC and an external circuit power supply, and the selection of the pressure regulation and switching functions of the AVU valve 101 is achieved using relay control.

[0081] The AVU valve 101 durability testing system provided by this invention integrates a high-pressure, dry air, temperature chamber 102, switching load box and leakage meter 105 into a single AVU valve 101 testing system.

[0082] It should be further explained that the present invention uses a PLC sink interface to implement a high-voltage PWM signal (high level 24V, low level 10V) to directly drive the AVU valve 101, thereby achieving durability testing of the single-product pressure regulation function of the AVU valve 101 and also achieving durability testing of the single-product switching function of the AVU valve 101.

[0083] Figure 3 A schematic diagram of an embodiment of the durability testing system for the AVU valve 101 provided by the present invention includes:

[0084] Control unit 104 is also used to receive leakage measurement durability test command and drive AVU valve 101 to open or close based on leakage measurement durability test command;

[0085] Leakage meter 201, connected to the AVU valve 101 and the thermostat 102, is used to measure the gas leaking from the thermostat 102 when the AVU valve 101 is open or closed.

[0086] It is understandable that the control unit 104 is controlled based on the PLC sinking interface, and the control signal is an analog PWM signal, as explained below:

[0087] The PWM signal is controlled using a PCL sink interface with a maximum interface current of 0.5A. When the transistor is on, Y0 outputs a low level; when the transistor is off, Y0 outputs a 24V high level. The frequency at which the transistor is on and off determines the frequency of the Y0 output signal, thus providing the control conditions for the PWM signal.

[0088] Two 24V-DC power supplies in the external circuit are used to generate a high-voltage PWM signal (high level 24V, low level 10V), thereby driving the AVU valve 101 to operate.

[0089] The PLC sinking interface can output multiple control signals, making the control circuit output consistent and sharing the same power supply.

[0090] The second pin of AVU valve 101 is the pressure regulating valve control port, and the sixth pin of AVU valve 101 is the switching valve control port. The two are switched by associated contact, that is, one normally closed contact and one normally open contact, thereby realizing the switching of valves.

[0091] The LN pin of AVU valve 101 is supplied with a voltage of 220V-AC.

[0092] The load after pressure regulation by AVU valve 101 is provided by load box 201, which is a sealed cavity of a specified volume.

[0093] When the AVU valve 101 is used for leakage detection, the leakage meter 201 is connected by turning on the second valve.

[0094] Figure 4 A schematic flowchart of an embodiment of the AVU valve durability testing method provided by the present invention includes:

[0095] S401, The control unit receives the pressure regulation durability test command, obtains the pressure regulation test input parameters based on the command, generates a pressure regulation control signal based on the input parameters, and drives the AVU valve to open or close based on the input parameters and control signal. The pressure regulation control signal includes: the duty cycle, time, and number of cycles. The pressure regulation test input parameters include: the pressure regulation value and the pressure regulation cycle stage.

[0096] S402. The load box provides a pressure load to the AVU valve in the thermostatic chamber when the AVU valve is open or closed.

[0097] It is understandable that the control unit is based on the PLC sinking interface for control, and the control signal is an analog PWM signal, as explained below:

[0098] The PWM signal is controlled using a PCL sink interface with a maximum interface current of 0.5A. When the transistor is on, Y0 outputs a low level; when the transistor is off, Y0 outputs a 24V high level. The frequency at which the transistor is on and off determines the frequency of the Y0 output signal, thus providing the control conditions for the PWM signal.

[0099] The high-voltage PWM signal (high level 24V, low level 10V) is generated by using two 24V-DC power supplies in the external circuit, thereby driving the AVU valve to operate.

[0100] The PLC sinking interface can output multiple control signals, making the control circuit output consistent and sharing the same power supply.

[0101] The second pin of the AVU valve is the pressure regulating valve control port, and the sixth pin of the AVU valve is the switching valve control port. The two are switched by an associated contact, that is, one normally closed contact and one normally open contact, thereby realizing the switching of the valve.

[0102] The LN pin of the AVU valve is supplied with a voltage of 220V-AC.

[0103] The load after pressure regulation by the AVU valve is provided by the load box, which is a sealed cavity of a specified volume.

[0104] When detecting leakage of the AVU valve, the leakage meter 106 is connected by turning on the second valve.

[0105] In the embodiments provided by the present invention, the method further includes:

[0106] The control unit receives the leakage measurement durability test command and drives the AVU valve to open or close based on the leakage measurement durability test command;

[0107] The leak meter measures the gas leaking from the AVU valve when the AVU valve is open or closed, and is placed in a constant temperature chamber.

[0108] It is understandable that the control unit is based on the PLC sinking interface for control, and the control signal is an analog PWM signal, as explained below:

[0109] The PWM signal is controlled using a PCL sink interface with a maximum interface current of 0.5A. When the transistor is on, Y0 outputs a low level; when the transistor is off, Y0 outputs a 24V high level. The frequency at which the transistor is on and off determines the frequency of the Y0 output signal, thus providing the control conditions for the PWM signal.

[0110] The high-voltage PWM signal (high level 24V, low level 10V) is generated by using two 24V-DC power supplies in the external circuit, thereby driving the AVU valve to operate.

[0111] The PLC sinking interface can output multiple control signals, making the control circuit output consistent and sharing the same power supply.

[0112] The second pin of the AVU valve is the pressure regulating valve control port, and the sixth pin of the AVU valve is the switching valve control port. The two are switched by an associated contact, that is, one normally closed contact and one normally open contact, thereby realizing the switching of the valve.

[0113] The LN pin of the AVU valve is supplied with a voltage of 220V-AC.

[0114] The load after pressure regulation by the AVU valve is provided by the load box, which is a sealed cavity of a specified volume.

[0115] When detecting leakage of the AVU valve, the leakage meter is connected by turning on the second valve.

[0116] In the embodiments provided by the present invention,

[0117] The control unit receives the pressure regulation durability test command of the AVU's pressure regulating valve or switching valve, obtains the pressure regulation test input parameters of the AVU's pressure regulating valve or switching valve based on the durability test command, generates the pressure regulation control signal of the AVU's pressure regulating valve or switching valve based on the pressure regulation test input parameters of the AVU's pressure regulating valve or switching valve, and drives the AVU valve to open or close based on the pressure regulation test input parameters of the AVU's pressure regulating valve or switching valve and the pressure regulation control signal of the AVU's pressure regulating valve or switching valve.

[0118] It is understandable that the control unit is based on the PLC sinking interface for control, and the control signal is an analog PWM signal, as explained below:

[0119] The PWM signal is controlled using a PCL sink interface with a maximum interface current of 0.5A. When the transistor is on, Y0 outputs a low level; when the transistor is off, Y0 outputs a 24V high level. The frequency at which the transistor is on and off determines the frequency of the Y0 output signal, thus providing the control conditions for the PWM signal.

[0120] The high-voltage PWM signal (high level 24V, low level 10V) is generated by using two 24V-DC power supplies in the external circuit, thereby driving the AVU valve to operate.

[0121] The PLC sinking interface can output multiple control signals, making the control circuit output consistent and sharing the same power supply.

[0122] The second pin of the AVU valve is the pressure regulating valve control port, and the sixth pin of the AVU valve is the switching valve control port. The two are switched by an associated contact, that is, one normally closed contact and one normally open contact, thereby realizing the switching of the valve.

[0123] The LN pin of the AVU valve is supplied with a voltage of 220V-AC.

[0124] The load after pressure regulation by the AVU valve is provided by the load box, which is a sealed cavity of a specified volume.

[0125] When detecting leakage of the AVU valve, the leakage meter is connected by turning on the second valve.

[0126] In the embodiments provided by the present invention,

[0127] The durability test command for the pressure regulating valve or switching valve of the AVU obtains the pressure regulating test input parameters of the pressure regulating valve or switching valve of the AVU, and generates the pressure regulating control signal of the pressure regulating valve or switching valve of the AVU based on the pressure regulating test input parameters of the pressure regulating valve or switching valve of the AVU, including:

[0128] The durability test command of the pressure regulating valve based on the AVU obtains the first parameter of the pressure regulating test of the pressure regulating valve of the AVU, and generates the first pressure regulating control signal of the pressure regulating valve of the AVU based on the first parameter of the pressure regulating test of the pressure regulating valve of the AVU.

[0129] The durability test command of the pressure regulating valve based on the AVU obtains the second parameter of the pressure regulating test input of the pressure regulating valve of the AVU, and generates the second pressure regulating control signal of the pressure regulating valve of the AVU based on the second parameter of the pressure regulating test input of the pressure regulating valve of the AVU.

[0130] The durability test command of the pressure regulating valve based on the AVU obtains the third parameter of the pressure regulating test input of the pressure regulating valve of the AVU, and generates the third pressure regulating control signal of the pressure regulating valve of the AVU based on the third parameter of the pressure regulating test input of the pressure regulating valve of the AVU.

[0131] The durability test command of the pressure regulating valve based on the AVU obtains the fourth parameter of the pressure regulating test input of the pressure regulating valve of the AVU, and generates the fourth pressure regulating control signal of the pressure regulating valve of the AVU based on the fourth parameter of the pressure regulating test input of the pressure regulating valve of the AVU.

[0132] The values ​​of the first, second, third, and fourth parameters of the pressure regulating valve input for the AVU are different.

[0133] It is understandable that the control unit is based on the PLC sinking interface for control, and the control signal is an analog PWM signal, as explained below:

[0134] The PWM signal is controlled using a PCL sink interface with a maximum interface current of 0.5A. When the transistor is on, Y0 outputs a low level; when the transistor is off, Y0 outputs a 24V high level. The frequency at which the transistor is on and off determines the frequency of the Y0 output signal, thus providing the control conditions for the PWM signal.

[0135] The high-voltage PWM signal (high level 24V, low level 10V) is generated by using two 24V-DC power supplies in the external circuit, thereby driving the AVU valve to operate.

[0136] The PLC sinking interface can output multiple control signals, making the control circuit output consistent and sharing the same power supply.

[0137] The second pin of the AVU valve is the pressure regulating valve control port, and the sixth pin of the AVU valve is the switching valve control port. The two are switched by an associated contact, that is, one normally closed contact and one normally open contact, thereby realizing the switching of the valve.

[0138] The LN pin of the AVU valve is supplied with a voltage of 220V-AC.

[0139] The load after pressure regulation by the AVU valve is provided by the load box, which is a sealed cavity of a specified volume.

[0140] When detecting leakage of the AVU valve, the leakage meter 106 is connected by turning on the second valve.

[0141] In the embodiments provided by the present invention,

[0142] The durability test command of the switching valve based on the AVU obtains the first parameter of the pressure regulation test of the switching valve based on the AVU, and generates the first pressure regulation control signal of the switching valve based on the first parameter of the pressure regulation test of the switching valve based on the AVU.

[0143] The durability test command of the switching valve based on the AVU obtains the second parameter of the pressure regulation test input of the switching valve based on the AVU, and generates the second pressure regulation control signal of the switching valve based on the second parameter of the pressure regulation test input of the switching valve based on the AVU.

[0144] The durability test command of the switching valve based on the AVU obtains the third parameter of the pressure regulation test input of the switching valve based on the AVU, and generates the third pressure regulation control signal of the switching valve based on the third parameter of the pressure regulation test input of the switching valve based on the AVU.

[0145] The durability test command of the switching valve based on the AVU obtains the fourth parameter of the pressure regulation test input of the switching valve based on the AVU, and generates the fourth pressure regulation control signal of the switching valve based on the fourth parameter of the pressure regulation test input of the switching valve based on the AVU.

[0146] The input values ​​for the first, second, third, and fourth parameters of the pressure regulation test of the AVU's switching valve are different.

[0147] It is understandable that the control unit is based on the PLC sinking interface for control, and the control signal is an analog PWM signal, as explained below:

[0148] The PWM signal is controlled using a PCL sink interface with a maximum interface current of 0.5A. When the transistor is on, Y0 outputs a low level; when the transistor is off, Y0 outputs a 24V high level. The frequency at which the transistor is on and off determines the frequency of the Y0 output signal, thus providing the control conditions for the PWM signal.

[0149] The high-voltage PWM signal (high level 24V, low level 10V) is generated by using two 24V-DC power supplies in the external circuit, thereby driving the AVU valve to operate.

[0150] The PLC sinking interface can output multiple control signals, making the control circuit output consistent and sharing the same power supply.

[0151] The second pin of the AVU valve is the pressure regulating valve control port, and the sixth pin of the AVU valve is the switching valve control port. The two are switched by an associated contact, that is, one normally closed contact and one normally open contact, thereby realizing the switching of the valve.

[0152] The LN pin of the AVU valve is supplied with a voltage of 220V-AC.

[0153] The load after pressure regulation by the AVU valve is provided by the load box, which is a sealed cavity of a specified volume.

[0154] When detecting leakage of the AVU valve, the leakage meter is connected by turning on the second valve.

[0155] In the embodiments provided by the present invention,

[0156] The pressure regulation test input parameters of the pressure regulating valve or switching valve based on the AVU generate the pressure regulating control signal of the pressure regulating valve or switching valve of the AVU, including:

[0157] The pressure regulation test input parameters of the AVU's pressure regulating valve or switching valve generate the duty cycle control signal of the AVU's pressure regulating valve or switching valve.

[0158] It is understandable that the control unit is based on the PLC sinking interface for control, and the control signal is an analog PWM signal, as explained below:

[0159] The PWM signal is controlled using a PCL sink interface with a maximum interface current of 0.5A. When the transistor is on, Y0 outputs a low level; when the transistor is off, Y0 outputs a 24V high level. The frequency at which the transistor is on and off determines the frequency of the Y0 output signal, thus providing the control conditions for the PWM signal.

[0160] The high-voltage PWM signal (high level 24V, low level 10V) is generated by using two 24V-DC power supplies in the external circuit, thereby driving the AVU valve to operate.

[0161] The PLC sinking interface can output multiple control signals, making the control circuit output consistent and sharing the same power supply.

[0162] The second pin of the AVU valve is the pressure regulating valve control port, and the sixth pin of the AVU valve is the switching valve control port. The two are switched by an associated contact, that is, one normally closed contact and one normally open contact, thereby realizing the switching of the valve.

[0163] The LN pin of the AVU valve is supplied with a voltage of 220V-AC.

[0164] The load after pressure regulation by the AVU valve is provided by the load box, which is a sealed cavity of a specified volume.

[0165] When detecting leakage of the AVU valve, the leakage meter is connected by turning on the second valve.

[0166] In the embodiments provided by the present invention,

[0167] The pressure regulation test input parameters of the AVU-based pressure regulating valve or switching valve and the pressure regulation control signal of the AVU-based pressure regulating valve or switching valve drive the AVU valve to open or close, including:

[0168] In the first stage of AVU pressure regulating valve control, the AVU valve is opened or closed based on the first parameter of the AVU pressure regulating valve pressure regulating test input and the first pressure regulating control signal of the AVU pressure regulating valve; the AVU valve is opened or closed based on the second parameter of the AVU pressure regulating valve pressure regulating test input and the second pressure regulating control signal of the AVU pressure regulating valve; the AVU valve is opened or closed based on the third parameter of the AVU pressure regulating valve pressure regulating test input and the third pressure regulating control signal of the AVU pressure regulating valve; and the AVU valve is opened or closed based on the fourth parameter of the AVU pressure regulating valve pressure regulating test input and the fourth pressure regulating control signal of the AVU pressure regulating valve.

[0169] In the second stage of AVU pressure regulating valve control, the AVU valve is opened or closed based on the first parameter of the AVU pressure regulating valve test input and the first pressure regulating control signal of the AVU pressure regulating valve; the AVU valve is opened or closed based on the second parameter of the AVU pressure regulating valve test input and the second pressure regulating control signal of the AVU pressure regulating valve; the AVU valve is opened or closed based on the third parameter of the AVU pressure regulating valve test input and the third pressure regulating control signal of the AVU pressure regulating valve; and the AVU valve is opened or closed based on the fourth parameter of the AVU pressure regulating valve test input and the fourth pressure regulating control signal of the AVU pressure regulating valve.

[0170] In the third stage of AVU pressure regulating valve control, the AVU valve is opened or closed based on the first parameter of the AVU pressure regulating valve test input and the first pressure regulating control signal of the AVU pressure regulating valve; the AVU valve is opened or closed based on the second parameter of the AVU pressure regulating valve test input and the second pressure regulating control signal of the AVU pressure regulating valve; the AVU valve is opened or closed based on the third parameter of the AVU pressure regulating valve test input and the third pressure regulating control signal of the AVU pressure regulating valve; and the AVU valve is opened or closed based on the fourth parameter of the AVU pressure regulating valve test input and the fourth pressure regulating control signal of the AVU pressure regulating valve.

[0171] In the fourth stage of AVU pressure regulating valve control, the AVU valve is opened or closed based on the first parameter of the AVU pressure regulating valve test input and the first pressure regulating control signal of the AVU pressure regulating valve; the AVU valve is opened or closed based on the second parameter of the AVU pressure regulating valve test input and the second pressure regulating control signal of the AVU pressure regulating valve; the AVU valve is opened or closed based on the third parameter of the AVU pressure regulating valve test input and the third pressure regulating control signal of the AVU pressure regulating valve; and the AVU valve is opened or closed based on the fourth parameter of the AVU pressure regulating valve test input and the fourth pressure regulating control signal of the AVU pressure regulating valve.

[0172] The first, second, third, and fourth stages of AVU pressure regulating valve control are different time periods that are consecutive in time.

[0173] It is understood that this invention uses a PLC sinking interface to implement a high-voltage PWM signal (high level 24V, low level 10V) to directly drive the AVU valve, thereby achieving durability testing of the AVU valve's single-product pressure regulation function and also achieving durability testing of the AVU valve's single-product switching function.

[0174] In the embodiments provided by the present invention,

[0175] In the first stage of AVU switching valve control, the AVU valve is opened or closed based on the first parameter input to the AVU switching valve pressure regulation test and the first pressure regulation control signal of the AVU switching valve; the AVU valve is opened or closed based on the second parameter input to the AVU switching valve pressure regulation test and the second pressure regulation control signal of the AVU switching valve; the AVU valve is opened or closed based on the third parameter input to the AVU switching valve pressure regulation test and the third pressure regulation control signal of the AVU switching valve; and the AVU valve is opened or closed based on the fourth parameter input to the AVU switching valve pressure regulation test and the fourth pressure regulation control signal of the AVU switching valve.

[0176] In the second stage of AVU switching valve control, the AVU valve is opened or closed based on the first parameter input to the AVU switching valve pressure regulation test and the first pressure regulation control signal of the AVU switching valve; the AVU valve is opened or closed based on the second parameter input to the AVU switching valve pressure regulation test and the second pressure regulation control signal of the AVU switching valve; the AVU valve is opened or closed based on the third parameter input to the AVU switching valve pressure regulation test and the third pressure regulation control signal of the AVU switching valve; and the AVU valve is opened or closed based on the fourth parameter input to the AVU switching valve pressure regulation test and the fourth pressure regulation control signal of the AVU switching valve.

[0177] In the third stage of AVU switching valve control, the AVU valve is opened or closed based on the first parameter input to the AVU switching valve pressure regulation test and the first pressure regulation control signal of the AVU switching valve; the AVU valve is opened or closed based on the second parameter input to the AVU switching valve pressure regulation test and the second pressure regulation control signal of the AVU switching valve; the AVU valve is opened or closed based on the third parameter input to the AVU switching valve pressure regulation test and the third pressure regulation control signal of the AVU switching valve; and the AVU valve is opened or closed based on the fourth parameter input to the AVU switching valve pressure regulation test and the fourth pressure regulation control signal of the AVU switching valve.

[0178] In the fourth stage of AVU switching valve control, the AVU valve is opened or closed based on the first parameter input to the AVU switching valve pressure regulation test and the first pressure regulation control signal of the AVU switching valve; the AVU valve is opened or closed based on the second parameter input to the AVU switching valve pressure regulation test and the second pressure regulation control signal of the AVU switching valve; the AVU valve is opened or closed based on the third parameter input to the AVU switching valve pressure regulation test and the third pressure regulation control signal of the AVU switching valve; and the AVU valve is opened or closed based on the fourth parameter input to the AVU switching valve pressure regulation test and the fourth pressure regulation control signal of the AVU switching valve.

[0179] The first, second, third, and fourth stages of AVU switching valve control are different time periods that are consecutive in time.

[0180] The above provides a detailed description of the AVU valve durability testing system and method provided by the present invention. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, those skilled in the art will recognize that there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. An AVU valve durability testing system, wherein the AVU stands for Engine Compressed Air Control Unit, characterized in that, include: A constant temperature chamber having an internal space to accommodate the AVU valve; A gas receiving container is connected to the AVU valve pipeline; The control unit, electrically connected to the AVU valve, receives pressure regulation durability test commands, acquires pressure regulation test input parameters based on these commands, generates a pressure regulation control signal, and drives the AVU valve to open or close based on the input parameters and the control signal. The pressure regulation control signal includes the duty cycle, time, and number of cycles. The pressure regulation test input parameters include the pressure regulation value and the pressure regulation cycle stage. The control unit uses a PLC sink interface to control the PWM signal, with a maximum interface current of 0.5A. When the transistor is on, Y0 outputs a low level; when the transistor is off, Y0 outputs a 24V high level. The two 24V-DC power supplies in the external circuit switch the high-voltage PWM signal between a high level of 24V and a low level of 10V to drive the AVU valve. The second pin of the AVU valve is the pressure regulating valve control port, and the sixth pin is the switching valve control port. These two pins are switched using associated contacts—one normally closed and one normally open—to achieve valve switching. The load cell, connected to the AVU valve pipeline and the constant temperature chamber pipeline, is used to provide a pressure load to the AVU valve in the constant temperature chamber when the pressure regulating test input parameters and pressure regulating control signals drive the AVU valve to open or close. One of the 24V-DC power supplies in the external circuit has its positive terminal connected to the first pin of the AVU valve and its negative terminal connected to the seventh pin of the AVU valve. The second pin of the AVU valve is connected to the first switching terminal of the switch C, and the sixth pin of the AVU valve is connected to the second switching terminal of the switch C. The common terminal of the switch C is connected to the Y0 terminal and is used for switching between the first and second switching terminals. The negative terminal of the other 24V-DC power supply in the external circuit is connected to the seventh pin of the AVU valve, and the seventh pin of the AVU valve is connected to the COMO terminal. The positive terminal of the other 24V-DC power supply in the external circuit is connected to one end of the fuse FUSE. The other end of the fuse FUSE is connected to one end of the resistor R-300Ω, and the other end of the resistor R-300Ω is connected to the common terminal of the switch C.

2. The AVU valve durability testing system according to claim 1, characterized in that, The control unit is also used to receive leakage measurement durability test commands and drive the AVU valve to open or close based on the leakage measurement durability test commands; The leak meter, connected to the AVU valve pipeline and the thermostat pipeline, is used to measure the gas leaking from the thermostat when the AVU valve is open or closed.

3. A durability testing method for an AVU valve, based on the AVU valve durability testing system as described in any one of claims 1-2, characterized in that, The method includes: The control unit receives the pressure regulation durability test command, obtains the pressure regulation test input parameters based on the command, generates a pressure regulation control signal based on the input parameters, and drives the AVU valve to open or close based on the input parameters and control signal. The pressure regulation control signal includes the pressure regulation duty cycle, time, and number of cycles. The pressure regulation test input parameters include the pressure regulation value and the pressure regulation cycle stage. The load cell provides a pressure load to the AVU valve in the thermostatic chamber when the AVU valve is opened or closed.

4. The durability test method for the AVU valve according to claim 3, characterized in that, The method further includes: The control unit receives the leakage measurement durability test command and drives the AVU valve to open or close based on the leakage measurement durability test command; The leak meter measures the gas leaking from the AVU valve when the AVU valve is open or closed, and is placed in a constant temperature chamber.

5. The AVU valve durability test method according to claim 3, characterized in that, The control unit receives the pressure regulation durability test command of the AVU's pressure regulating valve or switching valve, obtains the pressure regulation test input parameters of the AVU's pressure regulating valve or switching valve based on the durability test command, generates the pressure regulation control signal of the AVU's pressure regulating valve or switching valve based on the pressure regulation test input parameters of the AVU's pressure regulating valve or switching valve, and drives the AVU valve to open or close based on the pressure regulation test input parameters of the AVU's pressure regulating valve or switching valve and the pressure regulation control signal of the AVU's pressure regulating valve or switching valve.

6. The AVU valve durability test method according to claim 5, characterized in that, The durability test command for the pressure regulating valve or switching valve based on the AVU acquires the pressure regulating test input parameters of the pressure regulating valve or switching valve of the AVU, and generates a pressure regulating control signal for the pressure regulating valve or switching valve of the AVU based on the pressure regulating test input parameters of the pressure regulating valve or switching valve of the AVU, including: The durability test command of the pressure regulating valve based on the AVU obtains the first parameter of the pressure regulating test of the pressure regulating valve of the AVU, and generates the first pressure regulating control signal of the pressure regulating valve of the AVU based on the first parameter of the pressure regulating test of the pressure regulating valve of the AVU. The durability test command of the pressure regulating valve based on the AVU obtains the second parameter of the pressure regulating test input of the pressure regulating valve of the AVU, and generates the second pressure regulating control signal of the pressure regulating valve of the AVU based on the second parameter of the pressure regulating test input of the pressure regulating valve of the AVU. The durability test command of the pressure regulating valve based on the AVU obtains the third parameter of the pressure regulating test input of the pressure regulating valve of the AVU, and generates the third pressure regulating control signal of the pressure regulating valve of the AVU based on the third parameter of the pressure regulating test input of the pressure regulating valve of the AVU. The durability test command of the pressure regulating valve based on the AVU obtains the fourth parameter of the pressure regulating test input of the pressure regulating valve of the AVU, and generates the fourth pressure regulating control signal of the pressure regulating valve of the AVU based on the fourth parameter of the pressure regulating test input of the pressure regulating valve of the AVU. The values ​​of the first, second, third, and fourth parameters of the pressure regulating valve input for the AVU are different.

7. The durability test method for the AVU valve according to claim 6, characterized in that, The durability test command of the switching valve based on the AVU obtains the first parameter of the pressure regulation test of the switching valve based on the AVU, and generates the first pressure regulation control signal of the switching valve based on the first parameter of the pressure regulation test of the switching valve based on the AVU. The durability test command of the switching valve based on the AVU obtains the second parameter of the pressure regulation test input of the switching valve based on the AVU, and generates the second pressure regulation control signal of the switching valve based on the second parameter of the pressure regulation test input of the switching valve based on the AVU. The durability test command of the switching valve based on the AVU obtains the third parameter of the pressure regulation test input of the switching valve based on the AVU, and generates the third pressure regulation control signal of the switching valve based on the third parameter of the pressure regulation test input of the switching valve based on the AVU. The durability test command of the switching valve based on the AVU obtains the fourth parameter of the pressure regulation test input of the switching valve based on the AVU, and generates the fourth pressure regulation control signal of the switching valve based on the fourth parameter of the pressure regulation test input of the switching valve based on the AVU. The input values ​​for the first, second, third, and fourth parameters of the pressure regulation test of the AVU's switching valve are different.

8. The durability test method for the AVU valve according to claim 6, characterized in that, The pressure regulation test input parameters of the AVU-based pressure regulating valve or switching valve generate the pressure regulation control signal of the AVU-based pressure regulating valve or switching valve, including: The pressure regulation test input parameters of the AVU's pressure regulating valve or switching valve generate the duty cycle control signal of the AVU's pressure regulating valve or switching valve.

9. The durability test method for the AVU valve according to claim 3, characterized in that, The pressure regulation test input parameters of the AVU-based pressure regulating valve or switching valve and the pressure regulation control signal of the AVU-based pressure regulating valve or switching valve drive the AVU valve to open or close, including: In the first stage of AVU pressure regulating valve control, the AVU valve is opened or closed based on the first parameter of the AVU pressure regulating valve pressure regulating test input and the first pressure regulating control signal of the AVU pressure regulating valve; the AVU valve is opened or closed based on the second parameter of the AVU pressure regulating valve pressure regulating test input and the second pressure regulating control signal of the AVU pressure regulating valve; the AVU valve is opened or closed based on the third parameter of the AVU pressure regulating valve pressure regulating test input and the third pressure regulating control signal of the AVU pressure regulating valve; and the AVU valve is opened or closed based on the fourth parameter of the AVU pressure regulating valve pressure regulating test input and the fourth pressure regulating control signal of the AVU pressure regulating valve. In the second stage of AVU pressure regulating valve control, the AVU valve is opened or closed based on the first parameter of the AVU pressure regulating valve test input and the first pressure regulating control signal of the AVU pressure regulating valve; the AVU valve is opened or closed based on the second parameter of the AVU pressure regulating valve test input and the second pressure regulating control signal of the AVU pressure regulating valve; the AVU valve is opened or closed based on the third parameter of the AVU pressure regulating valve test input and the third pressure regulating control signal of the AVU pressure regulating valve; and the AVU valve is opened or closed based on the fourth parameter of the AVU pressure regulating valve test input and the fourth pressure regulating control signal of the AVU pressure regulating valve. In the third stage of AVU pressure regulating valve control, the AVU valve is opened or closed based on the first parameter of the AVU pressure regulating valve test input and the first pressure regulating control signal of the AVU pressure regulating valve; the AVU valve is opened or closed based on the second parameter of the AVU pressure regulating valve test input and the second pressure regulating control signal of the AVU pressure regulating valve; the AVU valve is opened or closed based on the third parameter of the AVU pressure regulating valve test input and the third pressure regulating control signal of the AVU pressure regulating valve; and the AVU valve is opened or closed based on the fourth parameter of the AVU pressure regulating valve test input and the fourth pressure regulating control signal of the AVU pressure regulating valve. In the fourth stage of AVU pressure regulating valve control, the AVU valve is opened or closed based on the first parameter of the AVU pressure regulating valve test input and the first pressure regulating control signal of the AVU pressure regulating valve; the AVU valve is opened or closed based on the second parameter of the AVU pressure regulating valve test input and the second pressure regulating control signal of the AVU pressure regulating valve; the AVU valve is opened or closed based on the third parameter of the AVU pressure regulating valve test input and the third pressure regulating control signal of the AVU pressure regulating valve; and the AVU valve is opened or closed based on the fourth parameter of the AVU pressure regulating valve test input and the fourth pressure regulating control signal of the AVU pressure regulating valve. The first, second, third, and fourth stages of AVU pressure regulating valve control are different time periods that are consecutive in time.

10. The durability test method for the AVU valve according to claim 9, characterized in that, In the first stage of AVU switching valve control, the AVU valve is opened or closed based on the first parameter input to the AVU switching valve pressure regulation test and the first pressure regulation control signal of the AVU switching valve; the AVU valve is opened or closed based on the second parameter input to the AVU switching valve pressure regulation test and the second pressure regulation control signal of the AVU switching valve; the AVU valve is opened or closed based on the third parameter input to the AVU switching valve pressure regulation test and the third pressure regulation control signal of the AVU switching valve; and the AVU valve is opened or closed based on the fourth parameter input to the AVU switching valve pressure regulation test and the fourth pressure regulation control signal of the AVU switching valve. In the second stage of AVU switching valve control, the AVU valve is opened or closed based on the first parameter input to the AVU switching valve pressure regulation test and the first pressure regulation control signal of the AVU switching valve; the AVU valve is opened or closed based on the second parameter input to the AVU switching valve pressure regulation test and the second pressure regulation control signal of the AVU switching valve; the AVU valve is opened or closed based on the third parameter input to the AVU switching valve pressure regulation test and the third pressure regulation control signal of the AVU switching valve; and the AVU valve is opened or closed based on the fourth parameter input to the AVU switching valve pressure regulation test and the fourth pressure regulation control signal of the AVU switching valve. In the third stage of AVU switching valve control, the AVU valve is opened or closed based on the first parameter input to the AVU switching valve pressure regulation test and the first pressure regulation control signal of the AVU switching valve; the AVU valve is opened or closed based on the second parameter input to the AVU switching valve pressure regulation test and the second pressure regulation control signal of the AVU switching valve; the AVU valve is opened or closed based on the third parameter input to the AVU switching valve pressure regulation test and the third pressure regulation control signal of the AVU switching valve; and the AVU valve is opened or closed based on the fourth parameter input to the AVU switching valve pressure regulation test and the fourth pressure regulation control signal of the AVU switching valve. In the fourth stage of AVU switching valve control, the AVU valve is opened or closed based on the first parameter input to the AVU switching valve pressure regulation test and the first pressure regulation control signal of the AVU switching valve; the AVU valve is opened or closed based on the second parameter input to the AVU switching valve pressure regulation test and the second pressure regulation control signal of the AVU switching valve; the AVU valve is opened or closed based on the third parameter input to the AVU switching valve pressure regulation test and the third pressure regulation control signal of the AVU switching valve; and the AVU valve is opened or closed based on the fourth parameter input to the AVU switching valve pressure regulation test and the fourth pressure regulation control signal of the AVU switching valve. The first, second, third, and fourth stages of AVU switching valve control are different time periods that are consecutive in time.

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