A circulation system, control method and vehicle for low-temperature hydrogen jet ice breaking

Abstract

The present invention relates to the technical field of hydrogen fuel circulation devices, and particularly relates to a circulation system for low-temperature hydrogen injection for ice breaking, which includes: hydrogen system integration; a hydrogen injector for adjusting the flow rate and pressure into the fuel cell stack; a hydrogen circulation pump for adjusting the hydrogen metering ratio; a hydrogen discharge valve; a pressure sensor; a fuel cell stack; a PACK and a hydrogen circulation pipeline. The present invention also includes a self-check process for the hydrogen injection start-up problem during the start-up of the hydrogen system. When the fuel cell system receives a start-up instruction, the hydrogen pipeline conducts a self-check; opens the hydrogen injection to judge the outlet pressure of the hydrogen injection. If the target value cannot be reached within a specified time, the hydrogen injection is closed; starts the hydrogen circulation pump and gives a target speed, and checks the outlet pressure value of the hydrogen injection. When the outlet pressure of the hydrogen injection reaches the target value, the subsequent start-up process is carried out, solving the problem of ice breaking of the fuel cell stack after the shutdown purge under the condition of low-temperature operation in winter, avoiding the risk of freezing of the hydrogen injection outlet pressure sensor resulting in inaccurate pressure sensor, and avoiding too high pressure on the hydrogen side of the hydrogen injection, causing damage to the fuel cell stack.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen fuel circulation devices, and particularly relates to a circulation system, a control method, and an automobile for low-temperature hydrogen injection ice breaking. Background Art

[0002] With the development of hydrogen fuel cell technology, higher requirements are put forward for the reliability of low-temperature cold start of fuel cell engines, especially in terms of hydrogen supply technology. Under the current technology, it is required that there is no ice freezing risk in the entire fuel cell hydrogen system, or there is ice freezing with self-thawing function to avoid the cold start of the fuel cell being affected because some components are frozen and cannot be opened. During the cold start process, the hydrogen injector is a component that is relatively easy to be frozen. In order to solve the problem that the hydrogen injector cannot be opened due to icing, the ice breaking function of the hydrogen injector is realized through reasonable control logic.

[0003] The existing design CN112825364 solves the ice breaking problem, but it is necessary to separately add a heating device or a drainage device to solve the icing problem. At the same time, the failure rate will increase after adding the heating device, and the volume will increase correspondingly after adding the drainage tank, resulting in difficult layout. Summary of the Invention

[0004] (1) Technical Problems to be Solved

[0005] The present invention provides a circulation system, a control method, and an automobile for low-temperature hydrogen injection ice breaking. In order to solve the problem that the hydrogen injector cannot be opened due to icing at low temperature, in the case of the hydrogen injector not being able to be opened during the low-temperature cold start process, the system does not report a fault and shut down first. The main purpose is to avoid a small amount of water vapor inside the fuel cell stack freezing and adhering to the inside of the hydrogen injector nozzle after the shutdown purge under the winter low-temperature operating conditions, resulting in the phenomenon that the hydrogen injector cannot be opened when starting the machine again. In addition, the hydrogen injector outlet pressure sensor itself also has the risk of freezing, resulting in inaccurate pressure sensors and being unable to keep the hydrogen injector ice breaking open for a long time, and avoiding too high pressure on the hydrogen side of the fuel cell stack, causing damage to the fuel cell stack.

[0006] (2) Technical Solutions

[0007] To solve the above technical problems, the present invention provides the following technical solutions: A circulation system for low-temperature hydrogen injection ice breaking, comprising: a hydrogen system integration, which supplies gas to the circulation system; a hydrogen injector, which adjusts the flow rate and pressure into the fuel cell stack; a hydrogen circulation pump, which adjusts the hydrogen metering ratio; a hydrogen discharge valve, which drains water and exhausts gas; a pressure sensor; a fuel cell stack; a PACK and a hydrogen circulation pipeline, wherein the outlet of the hydrogen system integration is connected to the inlet of the hydrogen injector.

[0008] Further, a pressure sensor is disposed between the stack and the hydrogen injector.

[0009] Further, the inlet of the hydrogen circulation pump is connected to the outlet of the stack and the inlet of the hydrogen injector.

[0010] The present invention also provides a control method for low-temperature hydrogen injection ice breaking, including the following steps:

[0011] Step 1: Turn on the hydrogen injector and check the outlet pressure of the hydrogen injector. When the outlet pressure of the hydrogen injector reaches the target value, execute the subsequent startup process; when the outlet pressure of the hydrogen injector does not reach the target value, execute Step 2;

[0012] Step 2: Turn on the hydrogen circulation pump, set the target speed of the hydrogen circulation pump, and execute Step 3;

[0013] Step 3: Monitor the real-time speed of the hydrogen circulation pump, and determine whether the speed of the hydrogen circulation pump reaches the target speed. If not, execute fault identification and shut down. If so, execute Step 4;

[0014] Step 4: Check the change difference of the outlet pressure value of the hydrogen injector, and determine whether the change difference of the outlet pressure value of the hydrogen injector is greater than the target value; if not, execute fault identification and shut down; if so, execute Step 5;

[0015] Step 5: Open the hydrogen injector for a set time, and check whether the outlet pressure of the hydrogen injector reaches the target value. If not, execute fault identification and shut down; if so, execute the subsequent startup process.

[0016] The present invention also provides an automobile, including a circulation system for low-temperature hydrogen injection ice breaking, and the circulation system is configured with the above-mentioned circulation system for low-temperature hydrogen injection ice breaking.

[0017] (III) Beneficial effects

[0018] Compared with the prior art, a circulation system, a control method and an automobile for low-temperature hydrogen injection ice breaking provided by the present invention have the following beneficial effects:

[0019] The present invention mainly solves the problem that the hydrogen injector cannot be opened due to icing in low-temperature conditions, and avoids the phenomenon that a small amount of water vapor in the stack freezes and adheres to the inside of the nozzle of the hydrogen injector after shutdown purging is completed, resulting in the inability to open the hydrogen injector during the next startup. Moreover, the outlet pressure sensor of the hydrogen injector itself also has the risk of freezing, causing inaccurate pressure sensors and being unable to keep the hydrogen injector open for a long time to break the ice, avoiding excessive pressure on the hydrogen side of the stack and causing damage to the stack.

[0020] Hydrogen injection ice breaking is achieved without adding external components, and the hydrogen circulation pump can accurately determine whether the hydrogen injection outlet pressure sensor is normal. Description of the Drawings

[0021] Figure 1 This is a schematic diagram of the overall structural connection of a circulation system for low-temperature hydrogen jet icebreaking according to the present invention.

[0022] Figure 2 This is a flowchart of a control method for low-temperature hydrogen jet icebreaking according to the present invention.

[0023] Reference Numerals in the Drawings:

[0024] 1. Hydrogen system integration; 2. Hydrogen injector; 3. Hydrogen jet outlet pressure sensor; 4. Stack; 5. Hydrogen circulation pump; 6. Hydrogen discharge valve; 7. PACK. Detailed Embodiments

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. Please refer to Figure 1 as shown, where Figure 1 This is a schematic diagram of the overall structural connection of a circulation system for low-temperature hydrogen jet icebreaking according to the present invention; Figure 2 This is a flowchart of a control method for low-temperature hydrogen jet icebreaking according to the present invention.

[0026] A circulation system for low-temperature hydrogen jet icebreaking provided by the present invention includes: a hydrogen system integration 1, where the hydrogen system integration 1 supplies gas for the circulation system; a hydrogen injector 2, where the hydrogen injector 2 adjusts the flow rate and pressure of the hydrogen entering the stack 4; a hydrogen circulation pump 5, where the hydrogen circulation pump 5 adjusts the hydrogen metering ratio; a hydrogen discharge valve 6, where the hydrogen discharge valve 6 drains water and exhausts gas; a pressure sensor; a stack 4; a PACK 7 and a hydrogen circulation pipeline, where the outlet of the hydrogen system integration 1 is connected to the inlet of the hydrogen injector 2.

[0027] Further, the pressure sensor is arranged between the stack 4 and the hydrogen injector 2.

[0028] Further, the inlet of the hydrogen circulation pump 5 is connected to the outlet of the stack 4 and the inlet of the hydrogen injector 2.

[0029] The present application also provides a control method for low-temperature hydrogen jet icebreaking, including the following steps:

[0030] Step 1: Open the hydrogen injector 2, check the outlet pressure of the hydrogen injector 2. When the outlet pressure of the hydrogen injector 2 reaches the target value, execute the subsequent startup process; when the outlet pressure of the hydrogen injector 2 does not reach the target value, execute Step 2;

[0031] Step 2: Turn on the hydrogen circulation pump, set the target speed of the hydrogen circulation pump, and proceed to Step 3;

[0032] Step 3: Monitor the real-time speed of the hydrogen circulation pump and determine whether the speed of the hydrogen circulation pump reaches the target speed. If not, perform fault identification and shut down. If so, proceed to Step 4;

[0033] Step 4: Verify the change difference of the outlet pressure value of the hydrogen injector 2 and determine whether the change difference of the outlet pressure value of the hydrogen injector 2 is greater than the target value. If not, perform fault identification and shut down. If so, proceed to Step 5;

[0034] Step 5: Turn on the hydrogen injector 2 for a set time and detect whether the outlet pressure of the hydrogen injector 2 reaches the target value. If not, perform fault identification and shut down. If so, execute the subsequent start-up process.

[0035] The present application also provides an automobile, including a circulation system for low-temperature hydrogen injection for ice breaking, and the circulation system is configured as the circulation system for low-temperature hydrogen injection for ice breaking described above.

[0036] Without adding hardware, the present invention well solves the problem that the hydrogen injector cannot be opened due to ice freezing during the low-temperature cold start process through the control system, and avoids engine fault shutdown caused by the inability to open the hydrogen injector during the cold start process of actual vehicle application.

[0037] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A control method for low-temperature hydrogen jet ice breaking, characterized in that, the method is based on a circulation system for low-temperature hydrogen jet ice breaking, including: Hydrogen system integration, which supplies gas to the circulation system; a hydrogen injector, which adjusts the flow rate and pressure of the hydrogen entering the fuel cell stack; a hydrogen circulation pump, which adjusts the hydrogen metering ratio; a hydrogen discharge valve, which discharges water and exhaust gas; a pressure sensor; a fuel cell stack; a PACK and a hydrogen circulation pipeline; the outlet of the hydrogen system integration is connected to the inlet of the hydrogen injector; the method includes the following steps: Step 1: Open the hydrogen injector and verify the outlet pressure of the hydrogen injector. When the outlet pressure of the hydrogen injector reaches the target value, execute the subsequent startup process; when the outlet pressure of the hydrogen injector does not reach the target value, execute Step 2; Step 2: Open the hydrogen circulation pump, set the target speed of the hydrogen circulation pump, and execute Step 3; Step 3: Monitor the real-time speed of the hydrogen circulation pump to determine whether the speed of the hydrogen circulation pump reaches the target speed. If not, execute a fault identification and shut down. If so, execute Step 4; Step 4: Verify the change difference of the outlet pressure value of the hydrogen injector to determine whether the change difference of the outlet pressure value of the hydrogen injector is greater than the target value; if not, execute a fault identification and shut down; if so, execute Step 5; Step 5: Open the hydrogen injector for a set time and detect whether the outlet pressure of the hydrogen injector reaches the target value. If not, execute a fault identification and shut down; if so, execute the subsequent startup process.

2. A control method for low-temperature hydrogen jet ice breaking according to claim 1, characterized in that, the pressure sensor is arranged between the fuel cell stack and the hydrogen injector.

3. A control method for low-temperature hydrogen jet ice breaking according to claim 1, characterized in that, the inlet of the hydrogen circulation pump is connected to the outlet of the fuel cell stack and the inlet of the hydrogen injector.

4. An automobile, including a circulation system for low-temperature hydrogen jet ice breaking, characterized in that, the circulation system is configured with the control method for low-temperature hydrogen jet ice breaking according to any one of claims 1-3.

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