Pressure maintaining test method and device of engine hydrogen supply system, vehicle and program product

Abstract

The invention relates to the technical field of engines, in particular to a pressure maintaining test method and device of an engine hydrogen supply system, a vehicle and a program product. If the engine stops running, after an inspection instruction sent by a driver is received, the controller controls the first stop valve to be closed and the second stop valve to be opened, controls the second stop valve to be closed after hydrogen is exhausted through the hydrogen exhaust pipeline, controls the third stop valve to be opened, and outputs nitrogen through the nitrogen storage device; after the pressure regulating valve is controlled to regulate the current pressure of the hydrogen engine to the preset dwell pressure, the fourth stop valve is controlled to be closed; and a first pressure drop value of the first pressure sensor is detected, and if the first pressure drop value is larger than or equal to a first preset threshold value within preset time, it is judged that leakage exists in the engine hydrogen supply system. Therefore, the problem of how to detect hydrogen leakage of the hydrogen supply system of the hydrogen fuel engine is solved, the maintenance cost is effectively reduced, and the safety of the hydrogen supply system is guaranteed.

Description

Technical Field

[0001] The present application relates to the field of engine technology, and in particular to a pressure maintenance test method, device, vehicle and program product for an engine hydrogen supply system. Background Art

[0002] The hydrogen supply system of a hydrogen fuel engine is a key component to ensure efficient and safe operation of the engine. Due to the strong compressibility of hydrogen, the design and control of the hydrogen supply system becomes particularly important. The hydrogen supply system is not only related to the thermal efficiency and high performance of the hydrogen fuel engine, but also plays a vital role in ensuring the safe operation of the engine. Leakage in the hydrogen supply system may cause hydrogen to escape from the system. If the leakage is serious, it may pose a threat to the environment and personnel safety. Hydrogen is a gas lighter than air. It may spread rapidly after leakage. Hydrogen has a wide combustion range. Once the leaked hydrogen encounters a fire source, it is very easy to cause a fire or explosion, especially in a closed or semi-closed environment. The accumulation of hydrogen may reach the explosion limit, posing a serious threat to the safety of personnel and equipment. In order to prevent these hazards, a series of measures need to be taken to detect and deal with leakage problems in a timely manner. Summary of the invention

[0003] The present application provides a pressure maintenance test method, device, vehicle and program product for an engine hydrogen supply system to solve the problem of how to detect hydrogen leakage in the hydrogen supply system of a hydrogen fuel engine, effectively reduce maintenance costs and ensure the safety of the hydrogen supply system.

[0004] In a first aspect, an embodiment of the present application provides a pressure-maintaining test method for an engine hydrogen supply system, the method adopts a pressure-maintaining test system, the pressure-maintaining test system comprising a controller, a first pressure sensor, a second pressure sensor, a hydrogen storage device, a first stop valve, a second stop valve, a third stop valve, a fourth stop valve, a pressure regulating valve, a nitrogen storage device, a hydrogen exhaust pipeline and a hydrogen concentration sensor, wherein one end of the first stop valve is connected to the first end of the pressure regulating valve, the second end of the pressure regulating valve is connected to the second pressure sensor, the third end of the pressure regulating valve is connected to the controller, the second pressure sensor is connected to the hydrogen storage device, the other end of the first stop valve is connected to one end of the fourth stop valve and the first end of the hydrogen concentration sensor, one end of the second stop valve is respectively connected to one end of the third stop valve, the other end of the first stop valve and one end of the fourth stop valve, and the other end of the second stop valve is connected to the One end of the hydrogen exhaust pipeline is connected, the other end of the third stop valve is connected to the nitrogen storage device, the other end of the fourth stop valve is connected to the first pressure sensor, and the other end of the hydrogen exhaust pipeline is connected to the controller, including the following steps: judging whether the engine stops running; if the engine stops running, after receiving the inspection instruction sent by the driver, the first stop valve is controlled to close and the second stop valve is controlled to open by the controller, and the second stop valve is controlled to close after the hydrogen is emptied through the hydrogen exhaust pipeline, and the third stop valve is controlled to open to output nitrogen through the nitrogen storage device, and the pressure regulating valve is controlled to adjust the current pressure of the hydrogen engine to the preset pressure holding pressure, and then the fourth stop valve is controlled to close; detecting a first pressure drop value of the first pressure sensor, if the first pressure drop value is greater than or equal to a first preset threshold value within a preset time, it is determined that there is a leak in the engine hydrogen supply system.

[0005] Optionally, after detecting the first pressure drop value of the first pressure sensor, the method further includes: if the first pressure drop value is less than a first preset threshold value within the preset time, determining that there is no leakage in the engine hydrogen supply system.

[0006] Optionally, after determining that the engine hydrogen supply system has a leak, it also includes: controlling a fifth stop valve arranged at the inlets of multiple hydrogen nozzles of the engine hydrogen supply system to close, and detecting a second pressure drop value of the hydrogen supply pipeline of the engine hydrogen supply system within the preset time; if it is detected that the second pressure drop value is greater than a second preset threshold value within the preset time, it is determined that the hydrogen supply pipeline has a leak, and a hydrogen supply pipeline leakage alarm is sent to the target terminal, wherein a first end of the hydrogen supply pipeline is connected to the first pressure sensor and the second end of the hydrogen concentration sensor, a second end of the hydrogen supply pipeline is connected to one end of the fifth stop valve and a third end of the hydrogen concentration sensor, the third end of the hydrogen supply pipeline is connected to the controller, and the other end of the fifth stop valve is connected to the controller.

[0007] Optionally, after detecting the second pressure drop value of the hydrogen supply pipeline of the engine hydrogen supply system within the preset time, it includes: if the second pressure drop value is less than a third preset threshold value within the preset time, it is determined that there is a leak in at least one hydrogen nozzle, and the fifth stop valve at the inlet of each hydrogen nozzle is closed in turn, and a hydrogen nozzle leakage alarm is sent to the target terminal.

[0008] Optionally, after judging whether the engine stops running, it includes: if the engine is in operation, obtaining the actual rail pressure of the engine at the second pressure sensor of the engine hydrogen supply system and the current hydrogen concentration value at the hydrogen concentration sensor of the engine hydrogen supply system; when the difference between the actual rail pressure of the engine and the target required rail pressure is greater than a fourth preset threshold, or the current hydrogen concentration value is greater than a fifth preset threshold, sending a hydrogen leakage alarm to the target terminal, and cutting off the hydrogen supply through the first shut-off valve under a preset emergency state, and exhausting the hydrogen through the hydrogen exhaust pipeline.

[0009] In a second aspect, an embodiment of the present application provides a pressure-maintaining test device for an engine hydrogen supply system, wherein the device adopts a pressure-maintaining test system, and the pressure-maintaining test system includes a controller, a first pressure sensor, a second pressure sensor, a hydrogen storage device, a first stop valve, a second stop valve, a third stop valve, a fourth stop valve, a pressure regulating valve, a nitrogen storage device, a hydrogen exhaust pipeline, and a hydrogen concentration sensor, wherein one end of the first stop valve is connected to the first end of the pressure regulating valve, the second end of the pressure regulating valve is connected to the second pressure sensor, the third end of the pressure regulating valve is connected to the controller, the second pressure sensor is connected to the hydrogen storage device, the other end of the first stop valve is connected to one end of the fourth stop valve and the first end of the hydrogen concentration sensor, one end of the second stop valve is respectively connected to one end of the third stop valve, the other end of the first stop valve and one end of the fourth stop valve, and the other end of the second stop valve is connected to one end of the hydrogen exhaust pipeline. The first and second shut-off valves are connected to each other, the other end of the third shut-off valve is connected to the nitrogen storage device, the other end of the fourth shut-off valve is connected to the first pressure sensor, and the other end of the hydrogen exhaust pipeline is connected to the controller, including: a judgment module, used to judge whether the engine stops running; a control module, which is used to control the first shut-off valve to close and the second shut-off valve to open through the controller after receiving the inspection instruction sent by the driver if the engine stops running, and control the second shut-off valve to close after exhausting hydrogen through the hydrogen exhaust pipeline, and control the third shut-off valve to open to output nitrogen through the nitrogen storage device, and control the pressure regulating valve to adjust the current pressure of the hydrogen engine to the preset pressure holding pressure, and then control the fourth shut-off valve to close; a detection module, used to detect a first pressure drop value of the first pressure sensor, if the first pressure drop value is greater than or equal to a first preset threshold value within a preset time, it is determined that there is a leak in the engine hydrogen supply system.

[0010] Optionally, after detecting the first pressure drop value of the first pressure sensor, the detection module is further used to: determine that there is no leakage in the engine hydrogen supply system if the first pressure drop value is less than a first preset threshold within the preset time.

[0011] Optionally, after determining that there is a leak in the engine hydrogen supply system, the detection module is also used to: control the fifth stop valve arranged at the inlets of multiple hydrogen nozzles of the engine hydrogen supply system to close, and detect a second pressure drop value of the hydrogen supply pipeline of the engine hydrogen supply system within the preset time; if it is detected that the second pressure drop value is greater than a second preset threshold value within the preset time, it is determined that there is a leak in the hydrogen supply pipeline, and a hydrogen supply pipeline leakage alarm is sent to the target terminal, wherein a first end of the hydrogen supply pipeline is connected to the first pressure sensor and the second end of the hydrogen concentration sensor, the second end of the hydrogen supply pipeline is connected to one end of the fifth stop valve and the third end of the hydrogen concentration sensor, the third end of the hydrogen supply pipeline is connected to the controller, and the other end of the fifth stop valve is connected to the controller.

[0012] Optionally, after detecting the second pressure drop value of the hydrogen supply pipeline of the engine hydrogen supply system within the preset time, the detection module is also used to: if the second pressure drop value is less than a third preset threshold value within the preset time, determine that there is a leak in at least one hydrogen nozzle, and close the fifth stop valve at the inlet of each hydrogen nozzle in turn, and send a hydrogen nozzle leakage alarm to the target terminal.

[0013] Optionally, after judging whether the engine stops running, the judgment module is further used to: if the engine is in operation, obtain the actual rail pressure of the engine at the second pressure sensor of the engine hydrogen supply system and the current hydrogen concentration value at the hydrogen concentration sensor of the engine hydrogen supply system; when the difference between the actual rail pressure of the engine and the target required rail pressure is greater than a fourth preset threshold, or the current hydrogen concentration value is greater than a fifth preset threshold, send a hydrogen leakage alarm to the target terminal, and cut off the hydrogen supply through the first shut-off valve in a preset emergency state, and exhaust the hydrogen through the hydrogen exhaust pipeline.

[0014] A third aspect of the present application provides a vehicle, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the pressure maintenance test method for the engine hydrogen supply system as described in the above embodiment.

[0015] A fourth aspect of the present application provides a computer program product on which a computer program is stored. The program is executed by a processor to implement the pressure maintenance test method of the engine hydrogen supply system as described in the above embodiment.

[0016] In the above embodiment, it is determined whether the engine stops running. If the engine stops running, after receiving the inspection instruction sent by the driver, the first stop valve is controlled to close and the second stop valve is controlled to open by the controller, and the second stop valve is controlled to close after the hydrogen is emptied through the hydrogen exhaust pipeline, and the third stop valve is controlled to open to output nitrogen through the nitrogen storage device, and the pressure regulating valve is controlled to adjust the current pressure of the hydrogen engine to the preset pressure holding pressure, and the fourth stop valve is controlled to close, and the first pressure drop value of the first pressure sensor is detected. If the first pressure drop value is greater than or equal to the first preset threshold value within the preset time, it is determined that there is a leak in the engine hydrogen supply system. In this way, the problem of how to detect hydrogen leakage in the hydrogen supply system of the hydrogen fuel engine is solved, the maintenance cost is effectively reduced, and the safety of the hydrogen supply system is guaranteed.

[0017] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0019] Figure 1 A flow chart of a pressure maintenance test method for an engine hydrogen supply system provided according to an embodiment of the present application;

[0020] Figure 2 It is a structural schematic diagram of a pressure maintenance test system of an engine hydrogen supply system according to one embodiment of the present application;

[0021] Figure 3 This is an example diagram of a pressure maintenance test device for an engine hydrogen supply system according to an embodiment of the present application;

[0022] Figure 4 It is a schematic diagram of a vehicle structure according to an embodiment of the present application. DETAILED DESCRIPTION

[0023] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0024] The following describes the pressure-maintaining test method, device, vehicle and program product of the engine hydrogen supply system of the embodiment of the present application with reference to the accompanying drawings. In view of the problem of how to detect hydrogen leakage of the hydrogen supply system of the hydrogen fuel engine mentioned in the above background technology, the present application provides a pressure-maintaining test method of the engine hydrogen supply system, in which it is determined whether the engine stops running. If the engine stops running, after receiving the inspection instruction sent by the driver, the first stop valve is controlled to close and the second stop valve is opened by the controller, and the second stop valve is controlled to close after the hydrogen is emptied through the hydrogen exhaust pipeline, and the third stop valve is controlled to open and output nitrogen through the nitrogen storage device, and the pressure regulating valve is controlled to adjust the current pressure of the hydrogen engine to the preset pressure-maintaining pressure, and the fourth stop valve is controlled to close, and the first pressure drop value of the first pressure sensor is detected. If the first pressure drop value is greater than or equal to the first preset threshold value within the preset time, it is determined that the engine hydrogen supply system has a leak. Thus, the problem of how to detect hydrogen leakage of the hydrogen supply system of the hydrogen fuel engine is solved, the maintenance cost is effectively reduced, and the safety of the hydrogen supply system is guaranteed.

[0025] Specifically, Figure 1 A schematic flow chart of a pressure maintenance test method for an engine hydrogen supply system provided in an embodiment of the present application.

[0026] like Figure 1 As shown, the pressure maintenance test method of the engine hydrogen supply system includes the following steps:

[0027] The method adopts a pressure-maintaining test system, which includes a controller 12, a first pressure sensor 5, a second pressure sensor 2, a hydrogen storage device 1, a first stop valve 4, a second stop valve 14, a third stop valve 10, a fourth stop valve 6, a pressure regulating valve 3, a nitrogen storage device 9 and a hydrogen exhaust pipeline 11, and a hydrogen concentration sensor 13, wherein one end of the first stop valve 4 is connected to the first end of the pressure regulating valve 3, the second end of the pressure regulating valve 3 is connected to the second pressure sensor 2, the third end of the pressure regulating valve 3 is connected to the controller 12, and the second pressure sensor 2 is connected to The first stop valve 4 is connected to the hydrogen storage device 1, the other end of the first stop valve 4 is connected to one end of the fourth stop valve 6 and the first end of the hydrogen concentration sensor 13, one end of the second stop valve 14 is respectively connected to one end of the third stop valve 10, the other end of the first stop valve 4 and one end of the fourth stop valve 6, the other end of the second stop valve 14 is connected to one end of the hydrogen exhaust pipeline 11, the other end of the third stop valve 10 is connected to the nitrogen storage device 9, one end of the fourth stop valve 6 is connected to the first pressure sensor 5, and the other end of the hydrogen exhaust pipeline 11 is connected to the controller 12.

[0028] Specific as Figure 2 As shown in the attached Figure 1As shown, the pressure-maintaining test system includes: a hydrogen storage device 1, a second pressure sensor 2, a pressure regulating valve 3, a first stop valve 4, a second stop valve 14, a first pressure sensor 5, a fourth stop valve 6, a hydrogen supply pipeline and a hydrogen rail assembly 7, a fifth stop valve 8 at the hydrogen inlet inside each hydrogen nozzle, a nitrogen storage device 9 and a third stop valve 10 connected in parallel with the hydrogen storage device 1, a hydrogen exhaust pipeline 11 arranged at the outlet of the third stop valve 4, and a controller 12 and a hydrogen concentration sensor 13 arranged at a key interface and a hydrogen rail and an injector assembly. The first end of the hydrogen supply pipeline and the hydrogen rail assembly 7 is connected to the first pressure sensor 5 and the second end of the hydrogen concentration sensor, the second end of the hydrogen supply pipeline and the hydrogen rail assembly 7 is connected to one end of the fifth stop valve 8 and the third end of the hydrogen concentration sensor 13, the third end of the hydrogen supply pipeline and the hydrogen rail assembly 7 is connected to the controller 12, and the other end of the fifth stop valve 8 is connected to the controller 12.

[0029] In step S101, it is determined whether the engine is stopped.

[0030] In step S102, if the engine stops running, after receiving the inspection instruction sent by the driver, the controller 12 controls the first stop valve 4 to close and the second stop valve 14 to open, and controls the second stop valve 14 to close after the hydrogen is exhausted through the hydrogen exhaust pipeline 11, and controls the third stop valve 10 to open to output nitrogen through the nitrogen storage device 9, controls the pressure regulating valve 3 to adjust the current pressure of the hydrogen engine to the preset pressure holding pressure, and then controls the fourth stop valve 6 to close.

[0031] Among them, the preset holding pressure can be a threshold value set in advance by the user, a threshold value obtained through a limited number of experiments, or a threshold value obtained through a limited number of computer simulations. In the embodiment of the present application, the preset holding pressure is consistent with the hydrogen rail pressure under common operating conditions of hydrogen engines, which can be 1 MPa.

[0032] In step S103, a first pressure drop value of the first pressure sensor 5 is detected. If the first pressure drop value is greater than or equal to a first preset threshold value within a preset time, it is determined that there is a leak in the engine hydrogen supply system.

[0033] The first preset threshold and the preset time may be thresholds preset by a user, thresholds obtained through a limited number of experiments, or thresholds obtained through a limited number of computer simulations, which are not specifically limited here.

[0034] Specifically, when the car stops, the driver sends an inspection instruction to the controller 12. After receiving the inspection instruction, the controller 12 controls the first stop valve 4 to close to cut off the hydrogen supply, and the second stop valve 14 to open, and the hydrogen is discharged through the hydrogen exhaust pipeline 11. Then, the first stop valve 4 and the second stop valve 14 are controlled to close, and the third stop valve 10 is controlled to open by the controller 12. The nitrogen storage device 9 provides nitrogen. After the pressure regulating valve 3 is adjusted to the preset pressure maintaining pressure, the fourth stop valve 6 is controlled to close. The above operations can be understood as the operation process of the pressure maintaining test.

[0035] Furthermore, the controller 12 detects the first pressure sensor 5 in real time. If it is detected that the first pressure drop value of the first pressure sensor 5 is greater than or equal to the first preset threshold value within the preset time, it is determined that there is a leakage in the engine hydrogen supply system, which can also be understood as the current leakage of the hydrogen supply system exceeds the safety range.

[0036] Optionally, in some embodiments, after detecting the first pressure drop value of the first pressure sensor 5, the method further includes: if the first pressure drop value is less than a first preset threshold value within a preset time, determining that there is no leakage in the engine hydrogen supply system.

[0037] It can be understood that if the first pressure drop value of the first pressure sensor 5 is less than the first preset threshold within the preset time, it means that there is no leakage in the hydrogen supply system, which can also be understood as the current leakage amount of the hydrogen supply system is within a safe range.

[0038] Optionally, in some embodiments, after determining that the engine hydrogen supply system has a leak, it also includes: controlling the fifth stop valve 8 disposed at the inlet of the multiple hydrogen nozzles of the engine hydrogen supply system to close, detecting the second pressure drop value of the hydrogen supply pipeline of the engine hydrogen supply system within a preset time; if it is detected that the second pressure drop value within the preset time is greater than the second preset threshold, it is determined that the hydrogen supply pipeline has a leak, and a hydrogen supply pipeline leak alarm reminder is sent to the target terminal, wherein the first end of the hydrogen supply pipeline is connected to the first pressure sensor 5 and the second end of the hydrogen concentration sensor 13, the second end of the hydrogen supply pipeline is connected to one end of the fifth stop valve 8 and the third end of the hydrogen concentration sensor 13, the third end of the hydrogen supply pipeline is connected to the controller 12, and the other end of the fifth stop valve 8 is connected to the controller 12. The hydrogen supply pipeline is the hydrogen supply pipeline and hydrogen rail assembly 7 mentioned above.

[0039] Among them, the preset time and the second preset threshold can be thresholds set in advance by the user, can be thresholds obtained through a limited number of experiments, or can be thresholds obtained through a limited number of computer simulations. In this embodiment of the application, the preset time can be 0.5h, and the second preset threshold can be 0.3MPa.

[0040] Specifically, if there is a leak in the engine hydrogen supply system, the fifth stop valve 8 arranged at the inlet of multiple hydrogen nozzles in the engine hydrogen supply system is controlled to be closed, and the second pressure drop value of the hydrogen supply pipeline of the engine hydrogen supply system within the preset time is detected. If the second pressure drop value is greater than the second preset threshold value within the preset time, it means that there is a leak in the hydrogen supply pipeline. The controller 12 sends a hydrogen supply pipeline leakage alarm reminder to the target terminal, reminding the user to repair and maintain the hydrogen supply pipeline.

[0041] Optionally, in some embodiments, after detecting the second pressure drop value of the hydrogen supply pipeline of the engine hydrogen supply system within a preset time, it includes: if the second pressure drop value within the preset time is less than a third preset threshold value, it is determined that at least one hydrogen nozzle has a leak, and the fifth stop valve 8 at the inlet of each hydrogen nozzle is closed in turn, and a hydrogen nozzle leakage alarm is sent to the target terminal.

[0042] Among them, the third preset threshold can be a threshold set in advance by the user, can be a threshold obtained through a limited number of experiments, or can be a threshold obtained through a limited number of computer simulations. In the embodiment of the present application, the third preset threshold is 0.1 MPa.

[0043] It can be understood that if the second pressure drop value of the hydrogen supply pipeline of the engine hydrogen supply system is less than the third preset threshold value within the preset time, it means that the leakage of the hydrogen nozzle is large. At this time, the fifth stop valve 8 at the hydrogen inlet inside each hydrogen nozzle is closed in sequence according to the set order to ensure that the leakage of one nozzle is tested each time the pressure maintenance test is performed. The operation process of the above pressure maintenance test is repeated, and a hydrogen nozzle leakage alarm reminder is sent to the target terminal to remind the user to maintain and replace the hydrogen nozzle.

[0044] Optionally, in some embodiments, after judging whether the engine stops running, it includes: if the engine is in operation, obtaining the actual rail pressure of the engine at the second pressure sensor 2 of the engine hydrogen supply system and the current hydrogen concentration value at the hydrogen concentration sensor 13 of the engine hydrogen supply system; when the difference between the actual rail pressure of the engine and the target required rail pressure is greater than the fourth preset threshold, or the current hydrogen concentration value is greater than the fifth preset threshold, sending a hydrogen leakage alarm to the target terminal, and cutting off the hydrogen supply through the first shut-off valve 4 in a preset emergency state, and exhausting the hydrogen through the hydrogen exhaust pipe 11.

[0045] The fourth preset threshold and the fifth preset threshold may be thresholds preset by a user, may be thresholds obtained through a limited number of experiments, or may be thresholds obtained through a limited number of computer simulations, and are not specifically limited here.

[0046] Specifically, when the engine is running, the controller 12 monitors the second pressure sensor 2, the first pressure sensor 5, and the hydrogen concentration sensor 13 in real time, wherein the detection value of the first pressure sensor 5 is the actual rail pressure of the engine operation, and when the deviation between the actual rail pressure of the engine operation and the required rail pressure exceeds the fourth preset threshold, or the current hydrogen concentration value detected by the hydrogen concentration sensor exceeds the fifth preset threshold, the hydrogen leakage alarm of the hydrogen supply system is promptly sent to the target terminal, and in an emergency, for example, when the current hydrogen concentration value exceeds a preset maximum warning value, the first shut-off valve 4 cuts off the hydrogen supply, and the hydrogen is discharged through the hydrogen exhaust pipe 11.

[0047] According to the pressure maintenance test method of the engine hydrogen supply system proposed in the embodiment of the present application, it is determined whether the engine stops running. If the engine stops running, after receiving the inspection instruction sent by the driver, the first stop valve is controlled to close and the second stop valve is opened through the controller, and the second stop valve is controlled to close after the hydrogen is emptied through the hydrogen exhaust pipeline, and the third stop valve is controlled to open to output nitrogen through the nitrogen storage device, and the pressure regulating valve is controlled to adjust the current pressure of the hydrogen engine to the preset pressure maintenance pressure, and the fourth stop valve is controlled to close, and the first pressure drop value of the first pressure sensor is detected. If the first pressure drop value is greater than or equal to the first preset threshold value within the preset time, it is determined that there is a leak in the engine hydrogen supply system. In this way, the problem of how to detect hydrogen leakage in the hydrogen supply system of a hydrogen fuel engine is solved, the maintenance cost is effectively reduced, and the safety of the hydrogen supply system is guaranteed.

[0048] Next, a pressure maintaining test device for an engine hydrogen supply system proposed in accordance with an embodiment of the present application will be described with reference to the accompanying drawings.

[0049] Figure 3 It is a block diagram of a pressure maintenance test device for an engine hydrogen supply system according to an embodiment of the present application.

[0050] The device adopts a pressure-maintaining test system, which includes a controller, a first pressure sensor, a second pressure sensor, a hydrogen storage device, a first stop valve, a second stop valve, a third stop valve, a fourth stop valve, a pressure regulating valve, a nitrogen storage device, a hydrogen exhaust pipeline and a hydrogen concentration sensor, wherein one end of the first stop valve is connected to the first end of the pressure regulating valve, the second end of the pressure regulating valve is connected to the second pressure sensor, the third end of the pressure regulating valve is connected to the controller, the second pressure sensor is connected to the hydrogen storage device, the other end of the first stop valve is connected to one end of the fourth stop valve and the hydrogen concentration sensor, one end of the second stop valve is respectively connected to one end of the third stop valve, the other end of the first stop valve and one end of the fourth stop valve, the other end of the second stop valve is connected to one end of the hydrogen exhaust pipeline, the other end of the third stop valve is connected to the nitrogen storage device, the other end of the fourth stop valve is connected to the first pressure sensor, and the other end of the hydrogen exhaust pipeline is connected to the controller. The pressure-maintaining test device 10 of the engine hydrogen supply system includes: a judgment module 100, a control module 200 and a detection module 300.

[0051] Among them, the judgment module 100 is used to judge whether the engine stops running; the control module 200 is used to control the first stop valve to close and the second stop valve to open through the controller after receiving the inspection instruction sent by the driver if the engine stops running, and control the second stop valve to close after the hydrogen is exhausted through the hydrogen exhaust pipeline, and control the third stop valve to open to output nitrogen through the nitrogen storage device, and control the pressure regulating valve to adjust the current pressure of the hydrogen engine to the preset pressure holding pressure, and then control the fourth stop valve to close; the detection module 300 is used to detect the first pressure drop value of the first pressure sensor. If the first pressure drop value is greater than or equal to the first preset threshold value within the preset time, it is determined that there is a leak in the engine hydrogen supply system.

[0052] Optionally, in some embodiments, after detecting the first pressure drop value of the first pressure sensor, the detection module 300 is further used to: determine that there is no leakage in the engine hydrogen supply system if the first pressure drop value is less than a first preset threshold within a preset time.

[0053] Optionally, in some embodiments, after determining that there is a leak in the engine hydrogen supply system, the detection module 300 is also used to: control the fifth shut-off valve arranged at the inlets of multiple hydrogen nozzles of the engine hydrogen supply system to close, and detect a second pressure drop value of the hydrogen supply pipeline of the engine hydrogen supply system within a preset time; if it is detected that the second pressure drop value within the preset time is greater than a second preset threshold, it is determined that there is a leak in the hydrogen supply pipeline, and a hydrogen supply pipeline leakage alarm reminder is sent to the target terminal, wherein a first end of the hydrogen supply pipeline is connected to the first pressure sensor and the second end of the hydrogen concentration sensor, the second end of the hydrogen supply pipeline is connected to one end of the fifth shut-off valve and the third end of the hydrogen concentration sensor, the third end of the hydrogen supply pipeline is connected to the controller, and the other end of the fifth shut-off valve is connected to the controller.

[0054] Optionally, in some embodiments, after detecting a second pressure drop value of a hydrogen supply pipeline of an engine hydrogen supply system within a preset time, the detection module 300 is further used to: if the second pressure drop value within the preset time is less than a third preset threshold value, determine that at least one hydrogen nozzle has a leak, and close the fifth stop valve at the inlet of each hydrogen nozzle in turn, and send a hydrogen nozzle leakage alarm to the target terminal.

[0055] Optionally, in some embodiments, after determining whether the engine has stopped running, the judgment module 100 is further used to: if the engine is in operation, obtain the actual rail pressure of the engine at the second pressure sensor of the engine hydrogen supply system and the current hydrogen concentration value at the hydrogen concentration sensor of the engine hydrogen supply system; when the difference between the actual rail pressure of the engine and the target required rail pressure is greater than a fourth preset threshold, or the current hydrogen concentration value is greater than a fifth preset threshold, send a hydrogen leakage alarm to the target terminal, and cut off the hydrogen supply through the first shut-off valve in a preset emergency state, and exhaust the hydrogen through the hydrogen exhaust pipeline.

[0056] It should be noted that the above explanation of the embodiment of the pressure-maintaining test method for the engine hydrogen supply system is also applicable to the pressure-maintaining test device for the engine hydrogen supply system of this embodiment, and will not be repeated here.

[0057] According to the pressure-maintaining test device of the engine hydrogen supply system proposed in the embodiment of the present application, it is determined whether the engine stops running. If the engine stops running, after receiving the inspection instruction sent by the driver, the first stop valve is controlled to close and the second stop valve is controlled to open by the controller, and the second stop valve is controlled to close after the hydrogen is emptied through the hydrogen exhaust pipeline, and the third stop valve is controlled to open to output nitrogen through the nitrogen storage device, and the pressure regulating valve is controlled to adjust the current pressure of the hydrogen engine to the preset pressure-maintaining pressure, and the fourth stop valve is controlled to close, and the first pressure drop value of the first pressure sensor is detected. If the first pressure drop value is greater than or equal to the first preset threshold value within the preset time, it is determined that there is a leak in the engine hydrogen supply system. In this way, the problem of how to detect hydrogen leakage in the hydrogen supply system of the hydrogen fuel engine is solved, the maintenance cost is effectively reduced, and the safety of the hydrogen supply system is guaranteed.

[0058] Figure 4 A schematic diagram of the structure of a vehicle provided in an embodiment of the present application. The vehicle may include:

[0059] Memory 401 , processor 402 , and a computer program stored in the memory 401 and executable on the processor 402 .

[0060] When the processor 402 executes the program, the pressure maintenance test method of the engine hydrogen supply system provided in the above embodiment is implemented.

[0061] Furthermore, the vehicle also includes:

[0062] The communication interface 403 is used for communication between the memory 401 and the processor 402 .

[0063] The memory 401 is used to store computer programs that can be executed on the processor 402 .

[0064] The memory 401 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

[0065] If the memory 401, the processor 402 and the communication interface 403 are implemented independently, the communication interface 403, the memory 401 and the processor 402 can be connected to each other through a bus and communicate with each other. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 4 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0066] Optionally, in a specific implementation, if the memory 401, the processor 402 and the communication interface 403 are integrated on a chip, the memory 401, the processor 402 and the communication interface 403 can communicate with each other through an internal interface.

[0067] The processor 402 may be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application.

[0068] An embodiment of the present application also provides a computer program product, on which a computer program is stored, and when the program is executed by a processor, the above-mentioned pressure maintenance test method of the engine hydrogen supply system is implemented.

[0069] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0070] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0071] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0072] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer program product for use with an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purposes of this specification, a "computer program product" can be any device that can contain, store, communicate, propagate or transmit a program for use with an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer program products (a non-exhaustive list) include the following: an electrical connection with one or N wirings (electronic device), a portable computer disk case (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). Furthermore, the computer program product may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example by optically scanning the paper or other medium and then editing, interpreting or, if necessary, processing in another suitable manner, and then storing it in a computer memory.

[0073] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiment, the N steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0074] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer program product, which, when executed, includes one or a combination of the steps of the method embodiment.

[0075] In addition, each functional unit in each embodiment of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer program product.

[0076] The computer program product mentioned above may be a read-only memory, a disk or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A pressure maintenance test method for an engine hydrogen supply system, characterized in that: The method adopts a pressure-maintaining test system, which includes a controller, a first pressure sensor, a second pressure sensor, a hydrogen storage device, a first stop valve, a second stop valve, a third stop valve, a fourth stop valve, a pressure regulating valve, a nitrogen storage device, a hydrogen exhaust pipeline and a hydrogen concentration sensor, wherein one end of the first stop valve is connected to the first end of the pressure regulating valve, the second end of the pressure regulating valve is connected to the second pressure sensor, the third end of the pressure regulating valve is connected to the controller, the second pressure sensor is connected to the hydrogen storage device, the other end of the first stop valve is connected to one end of the fourth stop valve and the first end of the hydrogen concentration sensor, one end of the second stop valve is respectively connected to one end of the third stop valve, the other end of the first stop valve and one end of the fourth stop valve, the other end of the second stop valve is connected to one end of the hydrogen exhaust pipeline, the other end of the third stop valve is connected to the nitrogen storage device, the other end of the fourth stop valve is connected to the first pressure sensor, and the other end of the hydrogen exhaust pipeline is connected to the controller, including the following steps: Determine whether the engine has stopped running; If the engine stops running, after receiving the inspection instruction sent by the driver, the controller controls the first stop valve to close and the second stop valve to open, and controls the second stop valve to close after the hydrogen is exhausted through the hydrogen exhaust pipeline, and controls the third stop valve to open to output nitrogen through the nitrogen storage device, controls the pressure regulating valve to adjust the current pressure of the hydrogen engine to the preset pressure holding pressure, and then controls the fourth stop valve to close; A first pressure drop value of the first pressure sensor is detected, and if the first pressure drop value is greater than or equal to a first preset threshold value within a preset time, it is determined that there is a leak in the engine hydrogen supply system.

2. The method according to claim 1, characterized in that After detecting the first pressure drop value of the first pressure sensor, the method further includes: If the first pressure drop value is less than a first preset threshold value within the preset time, it is determined that there is no leakage in the engine hydrogen supply system.

3. The method according to claim 1, characterized in that After determining that the engine hydrogen supply system has a leak, the method further includes: Controlling the fifth stop valves arranged at the inlets of the multiple hydrogen nozzles of the engine hydrogen supply system to close, and detecting a second pressure drop value of the hydrogen supply pipeline of the engine hydrogen supply system within the preset time; If it is detected that the second pressure drop value within the preset time is greater than the second preset threshold value, it is determined that there is a leak in the hydrogen supply pipeline, and a hydrogen supply pipeline leakage alarm reminder is sent to the target terminal, wherein the first end of the hydrogen supply pipeline is connected to the first pressure sensor and the second end of the hydrogen concentration sensor, the second end of the hydrogen supply pipeline is connected to one end of the fifth shut-off valve and the third end of the hydrogen concentration sensor, the third end of the hydrogen supply pipeline is connected to the controller, and the other end of the fifth shut-off valve is connected to the controller.

4. The method according to claim 3, characterized in that After detecting a second pressure drop value of the hydrogen supply pipeline of the engine hydrogen supply system within the preset time, the method includes: If the second pressure drop value is less than the third preset threshold value within the preset time, it is determined that at least one hydrogen nozzle has a leak, and the fifth stop valve at the inlet of each hydrogen nozzle is closed in turn, and a hydrogen nozzle leakage alarm is sent to the target terminal.

5. The method according to claim 1, characterized in that After judging whether the engine has stopped running, including: If the engine is in operation, obtaining the actual rail pressure of the engine at the second pressure sensor of the engine hydrogen supply system and the current hydrogen concentration value at the hydrogen concentration sensor of the engine hydrogen supply system; When the difference between the actual rail pressure of the engine and the target required rail pressure is greater than the fourth preset threshold, or the current hydrogen concentration value is greater than the fifth preset threshold, a hydrogen leakage alarm is sent to the target terminal, and the hydrogen supply is cut off through the first stop valve under a preset emergency state, and the hydrogen is discharged through the hydrogen exhaust pipeline.

6. A pressure test device for an engine hydrogen supply system, characterized in that: The device adopts a pressure-maintaining test system, which includes a controller, a first pressure sensor, a second pressure sensor, a hydrogen storage device, a first stop valve, a second stop valve, a third stop valve, a fourth stop valve, a pressure regulating valve, a nitrogen storage device, a hydrogen exhaust pipeline and a hydrogen concentration sensor, wherein one end of the first stop valve is connected to the first end of the pressure regulating valve, the second end of the pressure regulating valve is connected to the second pressure sensor, the third end of the pressure regulating valve is connected to the controller, the other end of the first stop valve is connected to one end of the fourth stop valve and the first end of the hydrogen concentration sensor, one end of the second stop valve is respectively connected to one end of the third stop valve, the other end of the first stop valve and one end of the fourth stop valve, the other end of the second stop valve is connected to one end of the hydrogen exhaust pipeline, the other end of the third stop valve is connected to the nitrogen storage device, the other end of the fourth stop valve is connected to the first pressure sensor, and the other end of the hydrogen exhaust pipeline is connected to the controller, and the device includes: A judgment module, used for judging whether the engine stops running; A control module, configured to, if the engine stops running, control the first stop valve to close and the second stop valve to open through the controller after receiving an inspection instruction sent by the driver, and control the second stop valve to close after exhausting hydrogen through the hydrogen exhaust pipeline, and control the third stop valve to open to output nitrogen through a nitrogen storage device, and control the pressure regulating valve to adjust the current pressure of the hydrogen engine to a preset pressure holding pressure, and then control the fourth stop valve to close; The detection module is used to detect a first pressure drop value of the first pressure sensor, and if the first pressure drop value is greater than or equal to a first preset threshold value within a preset time, it is determined that there is a leak in the engine hydrogen supply system.

7. The device according to claim 6, characterized in that After detecting the first pressure drop value of the first pressure sensor, the detection module is further used to: If the first pressure drop value is less than a first preset threshold value within the preset time, it is determined that there is no leakage in the engine hydrogen supply system.

8. The device according to claim 6, characterized in that After determining that the engine hydrogen supply system has a leak, the detection module is further used to: Controlling the fifth stop valves arranged at the inlets of the multiple hydrogen nozzles of the engine hydrogen supply system to close, and detecting a second pressure drop value of the hydrogen supply pipeline of the engine hydrogen supply system within the preset time; If it is detected that the second pressure drop value within the preset time is greater than the second preset threshold value, it is determined that there is a leak in the hydrogen supply pipeline, and a hydrogen supply pipeline leakage alarm is sent to the target terminal, wherein the first end of the hydrogen supply pipeline is connected to the first pressure sensor and the second end of the hydrogen concentration sensor, the second end of the hydrogen supply pipeline is connected to one end of the fifth shut-off valve and the third end of the hydrogen concentration sensor, the third end of the hydrogen supply pipeline is connected to the controller, and the other end of the fifth shut-off valve is connected to the controller.

9. A vehicle, characterized in that: It comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the pressure maintenance test method for the engine hydrogen supply system as described in any one of claims 1 to 5.

10. A computer program product, wherein the computer program product stores a computer program, characterized in that: When the program is executed by a processor, the pressure maintenance test method of the engine hydrogen supply system as described in any one of claims 1-5 is implemented.

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