An engine underwater exhaust control method and system

Abstract

The present application relates to the technical field of engine underwater exhaust, and discloses an engine underwater exhaust control method and system, comprising the following steps: detecting the underwater exhaust system before starting the engine exhaust; obtaining a first detection value, determining whether the electric control valve and the second one-way valve are invalid by comparing the size of the first detection value and a first preset value, and obtaining a judgment result; according to the judgment result, starting the booster pump and the electric control valve, and controlling the engine to start or not to start according to whether the booster pump can normally start. The present application solves the problem of water backflow caused by tail exhaust of fuel cell engine working underwater, which further harms the engine, and protects the engine from water backflow through three valves; the present application solves the problem of exhaust obstruction caused by water pressure fluctuation when underwater exhaust, and ensures the tail exhaust to be in a relatively stable pressure interval through the booster pump and the buffer container, so as to provide a better space environment for the engine underwater exhaust.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engine underwater exhaust, in particular to an engine underwater exhaust control method and system. BACKGROUND

[0002] Under the current carbon neutral and green low-energy environment, hydrogen fuel cell engines are attracting attention. With the development of the hydrogen energy industry, hydrogen fuel cell engines are not only applied to vehicles, but also gradually applied to water or underwater fields such as ships and submarines.

[0003] When the fuel cell engine is applied underwater, a series of problems will occur when the engine performs tail exhaust emission. For example, water backflow or exhaust obstruction due to water pressure fluctuations. Water backflow can harm the engine, and delayed exhaust can also harm the engine, and the engine cannot work continuously. Therefore, how to enable the engine to exhaust in time and not produce water backflow phenomenon is a problem that needs to be solved at present. SUMMARY

[0004] In order to solve the problems of water backflow and exhaust obstruction when the fuel cell engine is applied underwater, the present application provides an engine underwater exhaust control method and system.

[0005] The technical scheme of the present application is as follows:

[0006] An engine underwater exhaust control method, comprising the following steps:

[0007] Detecting the underwater exhaust system before starting the engine exhaust;

[0008] Obtaining a first detection value, comparing the first detection value with a first preset value to determine whether the electric control valve and the second check valve are invalid, and obtaining a determination result;

[0009] According to the determination result, the booster pump and the electric control valve are started, and whether the engine is started or not is controlled according to whether the booster pump can be normally started.

[0010] Further, the determination result includes:

[0011] If the first detection value is greater than or equal to the first preset value, the electric control valve and the second check valve are invalid;

[0012] If the first detection value is less than the first preset value, the electric control valve is not invalid.

[0013] Further, if the first detection value is greater than or equal to the first preset value, the electric control valve and the second check valve are invalid, which includes:

[0014] If the power steering pump starts normally, the second detection value is obtained, and the engine is started by comparing the second detection value with the second preset value.

[0015] If the power steering pump fails to start, the engine must not be started.

[0016] Further, the step of determining whether the engine has started by comparing the second detection value with the second preset value includes:

[0017] If the second detection value is less than or equal to the second preset value, the engine starts normally.

[0018] If the second detection value is greater than the second preset value, the engine is prohibited from starting.

[0019] Further, the condition that the solenoid valve does not fail when the first detected value is less than the first preset value includes:

[0020] Obtain the third detection value, and determine whether the second check valve has failed by comparing the third detection value with the third preset value.

[0021] Furthermore, when determining whether the second check valve has failed by comparing the third detection value with the third preset value, the following steps are included:

[0022] If the third detection value is greater than or equal to the third preset value, the second check valve will fail.

[0023] If the third detection value is less than the third preset value, the second check valve will not fail.

[0024] Furthermore, when determining whether the second check valve has failed by comparing the third detection value with the third preset value, the following steps are included:

[0025] Obtain the fourth detection value, and determine whether the engine has started by comparing the fourth detection value with the second preset value.

[0026] Further, the step of determining whether the engine has started by comparing the fourth detection value with the second preset value includes:

[0027] If the fourth detection value is less than or equal to the second preset value, the engine will start normally.

[0028] If the fourth detection value is greater than the second preset value, the engine is prohibited from starting.

[0029] The present invention also provides an underwater exhaust control system for an engine, used to implement the underwater exhaust control method for an engine as described in any of the above claims, comprising: multiple one-way valves, a buffer container, an electronically controlled valve, and a booster pump, wherein the one-way valves include a first one-way valve and a second one-way valve, and the first one-way valve, the buffer container, the electronically controlled valve, the booster pump, and the second one-way valve are connected in sequence.

[0030] Further, a pressure sensor and a liquid level sensor are arranged on the buffer container, the pressure sensor is used for feeding back the pressure in the buffer container to the assist pump, and the liquid level sensor is used for detecting the liquid level height in the buffer container.

[0031] The beneficial effects of the present application include:

[0032] (1) The phenomenon of water backflow caused by tail exhaust gas when the fuel cell engine works underwater is solved, and the engine is protected by three valves to prevent water backflow into the engine.

[0033] (2) The problem of exhaust obstruction caused by water pressure fluctuation when underwater exhaust is solved, and the assist pump and the buffer container ensure that the tail exhaust is in a relatively stable pressure range, providing a better space environment for the engine when underwater exhaust.

[0034] (3) And in the case of failure of the second check valve, the degree of assistance can be controlled by the assist pump according to the pressure in the buffer container to ensure that the pressure in the buffer container is within the acceptable pressure range of the tail exhaust. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 A flowchart of an engine underwater exhaust control method provided for embodiment 1 of the present application.

[0036] Figure 2 An implementation flowchart of an engine underwater exhaust control method provided for embodiment 1 of the present application.

[0037] Figure 3 A structural block diagram of an engine underwater exhaust control system provided for embodiment 2 of the present application.

[0038] Wherein:

[0039] 1-First check valve;

[0040] 2-Buffer container;

[0041] 3-Electric control valve;

[0042] 4-Assist pump;

[0043] 5-Second check valve;

[0044] 6-Pressure sensor;

[0045] 7-Liquid level sensor;

[0046] 8-Engine body. DETAILED DESCRIPTION

[0047] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0048] Embodiment 1

[0049] In combination Figures 1-2 As shown in the figure, the embodiment provides an engine underwater exhaust control method, comprising the following steps:

[0050] Detecting the underwater exhaust system before starting the engine exhaust;

[0051] Obtaining a first detection value, judging whether the electric control valve and the second check valve are invalid by comparing the size of the first detection value and a first preset value, and obtaining a judgment result;

[0052] According to the judgment result, the booster pump and the electric control valve are started, and whether the engine is started or not is controlled according to whether the booster pump can be normally started.

[0053] The first detection value is detected by a liquid level sensor on the buffer container to detect the liquid level height in the buffer container, and T1 is used to represent the first detection value. The first preset value is a set liquid level height, and T0 is used to represent.

[0054] Further, the judgment result includes:

[0055] If the first detection value T1 is greater than or equal to the first preset value T0, the electric control valve and the second check valve are invalid;

[0056] If the first detection value T1 is less than the first preset value T0, the electric control valve is not invalid.

[0057] Further, if the first detection value T1 is greater than or equal to the first preset value T0, the electric control valve and the second check valve are invalid, which includes:

[0058] If the booster pump is normally started, a second detection value is obtained, and whether the engine is started is judged by comparing the size of the second detection value and a second preset value;

[0059] If the booster pump cannot be normally started, the engine is prohibited to start.

[0060] The second detection value is detected by a pressure sensor on the buffer container, and P1 is used to represent. The second preset value is a pre-set pressure limit value, and P0 is used to represent.

[0061] Further, the step of determining whether the engine is started by comparing the second detection value with the second preset value comprises:

[0062] If the second detection value P1 is less than or equal to the second preset value P0, the engine is started normally.

[0063] If the second detection value P1 is greater than the second preset value P0, the engine is prohibited from starting.

[0064] Further, the step of determining that the electric control valve is not failed when the first detection value is less than the first preset value comprises:

[0065] A third detection value is obtained, and whether the second check valve is failed is determined by comparing the third detection value with a third preset value.

[0066] The third detection value is a pressure change value in a detection time range when the pressure sensor detects pressure, and is represented by ΔP. The third preset value is a target change value set in advance, and is represented by Pn.

[0067] Further, the step of determining whether the second check valve is failed by comparing the third detection value with the third preset value comprises:

[0068] If the third detection value ΔP is greater than or equal to the third preset value Pn, the second check valve is failed.

[0069] If the third detection value ΔP is less than the third preset value Pn, the second check valve is not failed.

[0070] Further, the step of determining whether the second check valve is failed by comparing the third detection value with the third preset value comprises:

[0071] A fourth detection value is obtained, and whether the engine is started is determined by comparing the fourth detection value with the second preset value.

[0072] The second detection value is detected by a pressure sensor on the buffer container, and is represented by P2. The second preset value is a preset pressure limit value, and is represented by P0.

[0073] Further, the step of determining whether the engine is started by comparing the fourth detection value with the second preset value comprises:

[0074] If the fourth detection value P2 is less than or equal to the second preset value P0, the engine is started normally.

[0075] If the fourth detection value P2 is greater than the second preset value P0, the engine is prohibited from starting.

[0076] The engine is in operation, the electric control valve is in the normal open state, the booster pump is adjusted according to the pressure feedback of the pressure sensor, and the pressure of the buffer container is controlled in the normal range.

[0077] After the engine is shut down, the electric control valve is immediately closed, and the booster pump is closed. This embodiment is aimed at the harm caused by the water backflow phenomenon to the engine when the engine works underwater, effectively prevents the water backflow phenomenon, and smoothly discharges the gas generated by the engine.

[0078] Embodiment 2

[0079] In combination Figure 3 With the engine underwater exhaust control system shown in embodiment 1, the engine underwater exhaust control method of any one of embodiment 1 is implemented, comprising an engine body 8, comprising: a plurality of one-way valves, a buffer container 2, an electric control valve 3 and a booster pump 4, the one-way valve comprises a first one-way valve 1 and a second one-way valve 5, the first one-way valve 1, the buffer container 2, the electric control valve 3, the booster pump 4 and the second one-way valve 5 are connected in sequence.

[0080] Further, the buffer container 2 is provided with a pressure sensor 6 and a liquid level sensor 7, the pressure sensor 6 is used to feedback the pressure in the buffer container 2 to the booster pump 4, and the liquid level sensor 7 is used to detect the liquid level in the buffer container 2.

[0081] The engine exhaust passes through the first one-way valve from the top of the pressure container into the sealed buffer container, the buffer container is provided with a pressure sensor and a liquid level sensor, the gas-liquid mixture passes through the electric control valve, the booster pump and the second one-way valve from the bottom of the buffer container, and is discharged into the water from the second one-way valve.

[0082] The second one-way valve is the first stage of the water backflow prevention valve, which can prevent water backflow when the water pressure is low.

[0083] The electric control valve is in the normal open state when the engine is running, and will be closed only when encountering abnormal conditions to prevent further water backflow, for example: the liquid level sensor detects that the liquid level in the buffer container is too high, judges that the second one-way valve may fail, or after the engine is shut down, the electric control valve will also be immediately closed.

[0084] The buffer container can accommodate a certain gas pressure, and at the same time, when the second one-way valve fails, it can play a certain buffer and will not directly let the water backflow to the generator. The buffer container can also provide a warning monitoring time for the water backflow phenomenon.

[0085] The first one-way valve is the last valve to prevent water backflow, even if the previous two valves fail, the first one-way valve can prevent water backflow. The first one-way valve and the second one-way valve are both mechanical backflow prevention valves, which have low cost.

[0086] The booster pump can discharge water and exhaust gas, and when the tail resistance is large, the booster pump can be started to assist the engine to discharge water and exhaust gas. It is also suitable for different underwater environments with different water depths. If the water depth pressure is large, the booster pump must be running normally to ensure that the buffer container is within the acceptable pressure range during tail discharge.

[0087] The combination of the buffer container and the booster pump ensures that the engine tail discharge is in a relatively stable pressure range, providing a better space for the actual application of the engine underwater. It can also deal with the failure of the second one-way valve. For example, when the engine exhaust control system is working normally, the booster pump will control the degree of assistance according to the pressure feedback from the pressure sensor on the buffer container to ensure that the buffer container is within the acceptable pressure range during tail discharge. When the engine is shut down, if the second one-way valve fails, water will flow back into the buffer container. At this time, the liquid level sensor will detect the liquid level and alarm. The engine can prevent water from continuing to flow back by closing the electrically controlled valve.

[0088] If the second one-way valve and the electrically controlled valve both fail, the first one-way valve can still serve as the last barrier to prevent water from flowing back. If you want to start the engine to return to the maintenance point, you need to determine whether the booster pump can be started. If the booster pump can be started to discharge water, the engine can be started and returned to the maintenance point. Otherwise, the engine is prohibited from starting.

[0089] The above is only an embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, as described in the specification and drawings of the present application, are also included in the patent protection scope of the present application.

Claims

1. An engine underwater exhaust control method, characterized in that: it comprises the following steps: detecting the underwater exhaust system before starting the engine exhaust; obtaining a first detection value, determining whether the electric control valve and the second check valve are invalid by comparing the size of the first detection value with a first preset value, and obtaining a judgment result; according to the judgment result, starting the booster pump and the electric control valve, and controlling the engine to start or not to start according to whether the booster pump can normally start; wherein the judgment result includes: if the first detection value is greater than or equal to the first preset value, the electric control valve and the second check valve are invalid; if the first detection value is less than the first preset value, the electric control valve is not invalid; wherein if the first detection value is greater than or equal to the first preset value, the electric control valve and the second check valve are invalid, including: if the booster pump starts normally, obtaining a second detection value, and determining whether the engine starts by comparing the size of the second detection value with a second preset value; if the booster pump cannot start normally, the engine is prohibited to start; wherein when determining whether the engine starts by comparing the size of the second detection value with the second preset value, including: if the second detection value is less than or equal to the second preset value, the engine starts normally; if the second detection value is greater than the second preset value, the engine is prohibited to start; wherein if the first detection value is less than the first preset value, the electric control valve is not invalid, including: obtaining a third detection value, and determining whether the second check valve is invalid by comparing the size of the third detection value with a third preset value; wherein when determining whether the second check valve is invalid by comparing the size of the third detection value with the third preset value, including: if the third detection value is greater than or equal to the third preset value, the second check valve is invalid; if the third detection value is less than the third preset value, the second check valve is not invalid; wherein the first detection value is detected by a liquid level sensor on the buffer container to detect the liquid level height in the buffer container, and the first preset value is a set liquid level height; wherein the second detection value is detected by a pressure sensor on the buffer container, and the second preset value is a pre-set pressure limit; wherein the third detection value is a pressure change value within a detection time range when the pressure sensor detects the pressure, and the third preset value is a pre-set target change value.

2. The engine underwater exhaust control method according to claim 1, characterized in that: when determining whether the second check valve is invalid by comparing the size of the third detection value with the third preset value, including: obtaining a fourth detection value, and determining whether the engine starts by comparing the size of the fourth detection value with the second preset value.

3. The engine underwater exhaust control method according to claim 2, characterized in that: when determining whether the engine starts by comparing the size of the fourth detection value with the second preset value, including: if the fourth detection value is less than or equal to the second preset value, the engine starts normally; if the fourth detection value is greater than the second preset value, the engine is prohibited to start.

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