CN116169319B - Air supply system and control method for air supply system - Google Patents

Abstract

The present application belongs to the technical field of fuel cells, and specifically relates to an air supply system and a control method of the air supply system. The air supply system includes: an air compressor for supercharging air; a turbocharger connected to the air compressor; a pressure-end bypass valve located at the pressure end of the turbocharger, with one end connected to the turbocharger. compressor, the other end is connected to the air compressor; the scroll end bypass valve, one end is connected to the passage between the stack and the air compressor, and the other end is connected to the scroll end of the turbocharger. The method includes: receiving the operating power of the air supply system; converting the operating power into load conditions of the air compressor; and controlling the bypass valve and the scroll end according to the load conditions. The bypass valve is turned on and off to make the air supply system operate in the corresponding working range. This application can improve the working efficiency of the air supply system.

Description

Air supply system and control method of air supply system

Technical field

The present application belongs to the technical field of fuel cells, and specifically relates to an air supply system and a control method of the air supply system.

Background technique

The main function of the fuel cell air supply system is to provide air with a certain pressure for the stack, and its core is the air compressor. Under different load conditions, the air compressor needs to adjust the relationship between air flow and pressure ratio according to the needs of the stack. Existing fuel cell air compressors mostly use electric two-stage centrifugal compressors, which are difficult to meet the needs of different load conditions at the same time. Under small load conditions, surge is prone to occur when the flow rate and high pressure ratio are small; under large load conditions, large flow and high voltage ratios consume higher electrical power. Severe surge will damage the air compressor, and high electrical power will reduce system efficiency. Both will affect the efficiency of the air supply system.

Contents of the invention

The purpose of this application is to provide an air supply system and a control method of the air supply system to improve the working efficiency of the air supply system.

According to one aspect of the embodiment of the present application, an air supply system is provided, the air supply system is used to provide air for a fuel cell, the air supply system includes:

An air compressor, used to pressurize the air entering the air compressor;

A turbocharger, the pressure end of the turbocharger is connected to the first end of the air compressor, used to pressurize the air and send the pressurized air to the air compressor;

Electric pile, the inlet end of the electric pile is connected to the air compressor, the outlet end of the electric pile is connected to the turbine end of the turbocharger, the turbocharger, the air compressor, The electric stacks are connected in sequence to form a closed loop, and the electric stacks are used to perform a reduction reaction on the air output by the air compressor;

Bypass valve, the first end of the bypass valve is connected to the second end of the air compressor, the second end of the bypass valve is connected to the scroll end of the turbocharger, and is used to circulate the The air output by the air compressor;

Pressure end bypass valve, the first end of the pressure end bypass valve is connected to the pressure end of the turbocharger, and the second end of the pressure end bypass valve is connected to the first end of the air compressor connect;

A scroll end bypass valve, a first end of which is connected to the passage between the stack and the turbocharger, and a second end of which is connected to the turbine Supercharger scroll end connection.

Optionally, the air supply system also includes:

Intercooler, the first end of the intercooler is connected to the second end of the air compressor;

A stack entry cut-off valve, the first end of the stack entry cut-off valve is connected to the second end of the intercooler, and the second end of the stack entry cut-off valve is connected to the inlet end of the stack;

A stack outlet stop valve, a first end of which is connected to the outlet end of the stack, and a second end of which is connected to the scroll end of the turbocharger.

Optional, air supply system includes:

The first end of the bypass valve is connected to the passage between the intercooler and the stack entry stop valve;

The first end of the scroll end bypass valve is connected to the passage between the stack outlet stop valve and the turbocharger.

According to one aspect of the embodiment of the present application, a control method for an air supply system is provided, which method includes:

Turbocharger, used to supercharge the air;

An air compressor, connected to the turbocharger, is used to supercharge the air output by the turbocharger;

A bypass valve, connected downstream of the air compressor, used to adjust the flow rate of air output by the air compressor;

A scroll end bypass valve, located at the scroll end of the turbocharger, used to control the working state of the turbocharger;

The electric stack has an inlet end connected to the air compressor and an outlet end connected to the turbocharger for reducing air;

The methods include:

receiving operating power of the air supply system;

Convert the operating power into the load condition of the air compressor, where the load condition is the relationship between the pressure ratio of the air compressor and the air flow rate;

According to the load conditions, the bypass valve and the scroll end bypass valve are controlled to be on and off, so that the air supply system operates in the corresponding working range.

The air supply system provided by the embodiment of the present application includes: an air compressor, used to pressurize the air entering the air compressor; a turbocharger, one end connected to the inlet end of the air compressor; a pressure-side bypass valve located on the turbine The pressure end of the supercharger is connected to the turbocharger at one end and the air compressor at the other end; the scroll end bypass valve is located at the scroll end of the turbocharger, with one end connected to the turbocharger and the other end connected to the electric compressor. On the circuit between the stack and the turbocharger; the stack is used to reduce the air. The control method of the air supply system provided by the embodiment of the present application includes: receiving the operating power of the air supply system, and converting the operating power into load conditions for the air compressor; and controlling the bypass valve and the air compressor according to the load conditions. The scroll end bypass valve is turned on and off to make the air supply system work in the corresponding working range; the load condition refers to the relationship between the air flow and the pressure ratio when the air compressor is working; by controlling each of the air supply system The on and off components enable the air compressor to work under various load conditions, allowing the air supply system to maintain higher working efficiency and better performance under different load conditions, further improving the air supply system. The working efficiency makes it meet the working needs of the stack.

Additional features and advantages of the invention will be apparent from the detailed description which follows, or, in part, may be learned by practice of the invention.

It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and do not limit the present application.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without exerting creative efforts.

Figure 1 shows a schematic structural diagram of an air supply system provided by an embodiment of the present application.

Figure 2 shows a schematic structural diagram of an air supply system provided by another embodiment of the present application.

FIG. 3 shows a schematic flowchart of the steps of a control method for an air supply system provided by an embodiment of the present application.

FIG. 4 shows a schematic diagram of the on-off status of the air supply system during the first load condition provided by an embodiment of the present application.

Figure 5 shows a schematic diagram of the on-off status of the air supply system during the second load condition provided by an embodiment of the present application.

Figure 6 shows a schematic diagram of the on-off status of the air supply system during the third load condition provided by an embodiment of the present application.

Figure 7 shows a schematic diagram of the working area of the air supply system provided by an embodiment of the present application.

Detailed ways

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in various forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concepts of the example embodiments. To those skilled in the art.

Furthermore, the described features, structures or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to provide a thorough understanding of embodiments of the present application. However, those skilled in the art will appreciate that the technical solutions of the present application may be practiced without one or more of the specific details, or other methods, components, devices, steps, etc. may be adopted. In other instances, well-known methods, apparatus, implementations, or operations have not been shown or described in detail to avoid obscuring aspects of the present application.

The block diagrams shown in the figures are functional entities only and do not necessarily correspond to physically separate entities. That is, these functional entities may be implemented in software form, or implemented in one or more hardware modules or integrated circuits, or implemented in different networks and/or processor devices and/or microcontroller devices. entity.

The flowcharts shown in the drawings are only illustrative, and do not necessarily include all contents and operations/steps, nor must they be performed in the order described. For example, some operations/steps can be decomposed, and some operations/steps can be merged or partially merged, so the actual order of execution may change according to the actual situation.

In the fuel cell, the function of the air supply system is to provide air with a certain pressure to the stack. The oxygen receives electrons from the anode at the cathode of the stack, and a reduction reaction occurs to generate water.

Figure 1 shows a schematic structural diagram of an air supply system provided by an embodiment of the present application.

In this embodiment, as shown in Figure 1, an air supply system is provided, including:

The air compressor 4 is used to pressurize the air entering the air compressor 4 .

The turbocharger 1 has a pressure end connected to the first end of the air compressor 4 for pressurizing the air and sending the pressurized air to the air compressor 4 .

Electric pile 9, the inlet end of the electric pile 9 is connected to the air compressor 4, the outlet end of the electric pile 9 is connected to the turbine end of the turbocharger 1, the turbocharger 1, the air compressor 4, and the electric pile 9 are connected in sequence A closed loop is formed, and the electric stack is used to perform a reduction reaction on the air output by the air compressor 4 .

Bypass valve 6, the first end of the bypass valve 6 is connected to the second end of the air compressor 4, the second end of the bypass valve 6 is connected to the scroll end of the turbocharger 1, and is used for circulation by the air compressor. 4 output air.

The pressure end bypass valve 2 has a first end connected to the pressure end of the turbocharger 1 and a second end connected to the first end of the air compressor 4 .

The scroll bypass valve 3 has a first end connected to the passage between the stack and the turbocharger 1, and a second end of the scroll bypass valve 3 is connected to the turbine of the turbocharger 1. end connection.

Specifically, in the air supply system, the air compressor 4 is used to pressurize the air entering the air compressor 4 and output the air with a certain pressure to the electric stack.

In the embodiment of the present application, a first-stage turbocharger 1 is added to adjust the working effect of the air supply system in the third load condition and the first load condition.

The turbocharger 1 is connected upstream of the air compressor 4 , that is, the pressure end of the turbocharger 1 is connected to the inlet end of the air compressor 4 . The outlet end of the stack 9 is connected to the turbine end of the turbocharger 1, and the stack exhaust gas discharged from the outlet end of the stack 9 drives the turbine of the turbocharger 1 to make the turbocharger 1 work.

The pressure end of the turbocharger 1 is located on the left side of the turbocharger 1 shown in Figure 1 , and the scroll end of the turbocharger 1 is located on the right side of the turbocharger 1 shown in Figure 1 .

Optionally, turbocharger 1 is a centrifugal compressor, and air compressor 4 is an electric two-stage centrifugal compressor. The centrifugal compressor has low noise, high efficiency and small size, which can effectively improve the efficiency of the air supply system.

Turbocharger 1 is an air compressor that increases intake air volume by compressing air.

The pressure end bypass valve 2 has a first end connected to the pressure end of the turbocharger 1 and a second end connected to the passage between the turbocharger 1 and the air compressor 4 . Specifically, the first end of the pressure end bypass valve 2 is connected to the intake pipe on the pressure end side of the turbocharger 1 .

The scroll end bypass valve 3 has a first end connected to the passage between the stack 9 and the turbocharger 1 and a second end connected to the scroll end of the turbocharger 1 . Specifically, the turbocharger 1 is provided with an air outlet end on the scroll end side, and the second end of the scroll end bypass valve 3 is connected to the outlet end of the turbocharger 1 on the scroll end side.

Optionally, the pressure end bypass valve 2 is a differential pressure driven valve, and the vortex end bypass valve 3 is an electric butterfly valve.

Bypass valve 6, the first end of the bypass valve 6 is connected to the passage between the outlet end of the air compressor 4 and the inlet end of the stack 9, and the connection point of the second end is located on the turbine side of the turbocharger 1, Specifically, it is at the exhaust end of the turbine side of the turbocharger 1 .

When the bypass valve 6 is opened, the bypass valve 6 is used to circulate the air output by the air compressor 4, so the air flow flowing into the stack 9 will be reduced. When the bypass valve 6 is closed, the air flow flowing into the stack 9 is related to the air flow flowing out of the air compressor 4 .

Optionally, the bypass valve 6 is an electric butterfly valve.

The turbocharger 1 is located upstream of the air compressor 4, and the stack 9 is located downstream of the air compressor 4. The outlet end of the stack 9 is connected to the turbocharger 1, so the exhaust gas discharged from the stack 9 can drive the turbine. Supercharger 1 drive. A closed loop is formed between the turbocharger 1, the air compressor 4 and the stack 9.

The air supply system provided by this embodiment includes a pressure-side bypass valve 2 and a scroll-side bypass valve 3. The pressure-side bypass valve 2 is located at the pressure end of the turbocharger 1. One end of the pressure-side bypass valve 2 is connected to the air supply. The inlet end of the compressor 4 is connected, and the other end is connected to the pressure end of the turbocharger 1 . The scroll bypass valve 3 is located at the scroll end of the turbocharger 1. One end of the scroll bypass valve 3 is connected to the circuit between the stack 9 and the turbocharger 1, and the other end is connected to the scroll of the turbocharger 1. end connection, the opening and closing of the pressure end bypass valve 2 and the scroll end bypass valve 3 can affect the working state of the turbocharger 1, further affecting the air flow and pressure ratio of the air in the air compressor 4, so that the air supply system can Maintaining good working results under various load conditions further improves the working efficiency of the air supply system, thus meeting the working needs of the stack.

As an optional implementation, as shown in Figure 2, the air supply system also includes:

Intercooler 5, the first end of the intercooler 5 is connected to the second end of the air compressor.

The first end of the stack entry cut-off valve 7 is connected to the second end of the intercooler 5 , and the second end of the stack entry cut-off valve 7 is connected to the inlet end of the stack 9 .

The stack outlet stop valve 8 has a first end connected to the outlet end of the stack 9 and a second end connected to the scroll end of the turbocharger 1 .

Specifically, the air supply system also includes an intercooler 5 and a stack entry stop valve 7 and a stack exit stop valve 8 .

After the air is compressed by the air compressor 4, the temperature will increase. If the air with too high temperature is directly introduced into the stack 9, it will cause irreversible damage to the proton membrane in the stack 9. The function of the intercooler 5 is to reduce the temperature of the air entering the stack 9 and prevent the high-temperature air from damaging the stack 9 .

Therefore, an intercooler 5 is connected after the air compressor 4 to reduce the temperature of the air entering the stack 9 . The first end of the intercooler 5 is connected to the second end of the air compressor 4 , and the second end of the intercooler 5 is connected to the first end of the stack entry stop valve 7 . The second end of the stack entry stop valve 7 is connected to the inlet end of the stack 9 .

The air cooled by the intercooler 5 enters the stack 9 through the stack cut-off valve 7 .

The stack outlet stop valve 8 is located at the outlet end of the stack 9. One end of the stack outlet cutoff valve 8 is connected to the outlet end of the stack 9, and the other end is connected to the scroll end of the turbocharger 1. The exhaust gas discharged from the stack 9 flows into the turbine end of the turbocharger 1 through the outlet stop valve 8, and then drives the turbine in the turbine end to rotate, driving the turbocharger 1 to work.

In this embodiment, the air supply system includes an intercooler 5, a stack entry stop valve 7, and a stack exit stop valve 8, which further constitutes a complete loop of the air supply system.

As an optional implementation, as shown in Figure 2, the air supply system includes:

The first end of the bypass valve 6 is connected to the passage between the intercooler 5 and the stack entry stop valve 7 .

The first end of the scroll end bypass valve 3 is connected to the passage between the stack outlet stop valve 8 and the turbocharger 1 .

Specifically, the intercooler 5 is connected to the rear end of the air compressor 4 . The first end of the bypass valve 6 is connected to the passage between the intercooler 5 and the stack stop valve 7 , and the second end of the bypass valve 6 is connected to the outlet end next to the scroll end of the turbocharger 1 .

When the bypass valve 6 is opened, the air discharged from the air compressor 4 enters the intercooler 5 and flows out through the channel of the bypass valve 6. Therefore, the air flow entering the stack 9 will be reduced.

The first end of the scroll end bypass valve 3 is connected to the passage between the outlet stop valve 8 and the turbocharger 1, and the second end of the scroll end bypass valve 3 is connected to the outlet end next to the scroll end of the turbocharger 1. superior. When the scroll bypass valve 3 is opened, the stack exhaust gas passing through the stack outlet stop valve 8 will be discharged through the scroll bypass valve 3. Therefore, the exhaust gas flow entering the turbocharger 1 will be reduced, thus causing a negative impact on the turbocharger. 1 has an impact on work efficiency.

In this embodiment, the installation positions of the bypass valve 6 and the scroll end bypass valve 3 are set according to the characteristics of the air supply system. Based on the usage requirements of the load conditions, the bypass valve 6 and the scroll end bypass valve 3 are controlled to be on and off, thereby changing the working status of the air compressor 4 and the turbocharger 3, thereby adjusting the working range of the air supply system, The air supply system can adapt to different load conditions and ensure high working efficiency.

In this embodiment, a control method for an air supply system is provided. As shown in Figure 2, the air supply system includes:

Turbocharger 1 is used to supercharge the air.

The air compressor 4 is connected to the turbocharger 2 and is used to pressurize the air output by the turbocharger 2 .

The bypass valve 6 is connected downstream of the air compressor 4 and is used to adjust the flow rate of air output by the air compressor 4 .

The scroll end bypass valve 3 is located at the scroll end of the turbocharger 1 and is used to control the working state of the turbocharger 1 .

The inlet end of the stack 9 is connected to the air compressor 4, and the outlet end is connected to the turbocharger 1 for reducing air.

The air first enters the pressure end of the turbocharger 1 for first-stage boosting, and then flows through the air compressor 4, where the temperature and pressure of the air increase again.

Optionally, the intercooler 5 and the stack entry stop valve 7 are connected behind the air compressor 4. The air after supercharging by the air compressor 4 is cooled by the intercooler 5 and then enters the stack 9 for reaction.

The exhaust gas reacted by the stack 9 is discharged to the turbine end of the turbocharger 1 .

Furthermore, the bypass valve 6 is connected downstream of the air compressor 4. When the bypass valve 6 is opened, the air discharged by the air compressor 4 is discharged through the bypass valve 6, so the air flow rate flowing into the stack 9 will be reduced.

The scroll end bypass valve 3 is located on the scroll end side of the turbocharger 1 . One end of the scroll bypass valve 3 is connected to the outlet end of the scroll end of the turbocharger 1 , and the other end is connected to the passage between the outlet end of the stack 9 and the scroll end of the turbocharger 1 .

When the scroll end bypass valve 3 is opened, the exhaust gas discharged from the stack 9 is discharged through the passage of the scroll end bypass valve 3 instead of entering the scroll end of the turbocharger 1 .

The function of the air supply system is to provide sufficient air with a certain pressure for the stack 9 to meet the power required by the fuel cell.

The air supply system provided by the embodiment of the present application is used to provide air for the fuel cell. The stack 9 is the place where electrochemical reactions occur and is the core part of the fuel cell power system.

The control method provided by this embodiment will be described below using the structure of the air supply system shown in FIG. 2 .

FIG. 3 shows a step flow chart of the control method of the air supply system provided by this embodiment.

As shown in Figure 3, the control method of the air supply system provided by this embodiment includes:

S10, receives the operating power of the air supply system.

Specifically, the operating power of the air supply system refers to the working intensity of the air supply system, which is related to the air intake demand of the air supply system.

First, the fuel cell controller receives the operating power of the fuel cell, and obtains the operating power of the air supply system based on the relationship between the operating power of the fuel cell and the air intake demand of the air supply system.

S20, convert the operating power into the load condition of the air compressor. The load condition is the relationship between the pressure ratio of the air compressor and the air flow rate.

Specifically, the operating power of the air supply system is converted into the load condition of the air compressor.

The air intake demand of the air supply system will eventually be broken down into the air flow and air pressure required for the electrochemical reaction of the stack.

Therefore, the load condition of the air compressor is actually related to the air flow rate and air pressure required by the stack.

There is a mapping relationship between the operating power of the air supply system and the load condition of the air compressor. Different load conditions can be divided according to the numerical range of operating power.

S30, according to the load conditions, control the opening and closing of the bypass valve and the scroll end bypass valve so that the air supply system operates in the corresponding working range.

Specifically, the on-off of the bypass valve and the scroll end bypass valve is controlled according to the load conditions. By controlling the on and off of the bypass valve and scroll end bypass valve, the operating power of the air compressor is adjusted, and the air flow entering the stack is affected at the same time to meet the corresponding load conditions, so that the air supply system works in accordance with the load conditions. working range, thereby making the working efficiency of the air supply system meet the working needs of the stack.

The working range of the air supply system corresponds to the load condition of the air compressor, which is ultimately broken down into the relationship between air flow and pressure ratio.

In this embodiment, the operating power of the air supply system is received, the operating power is converted into the load condition of the air compressor, and the on and off of the bypass valve and the scroll end bypass valve are controlled according to the corresponding load condition. , which in turn affects the working efficiency of the turbocharger and air compressor, so that the air supply system works in the working range corresponding to the load condition, which expands the operable area of the air compressor to a certain extent, so that the air supply system can It maintains high working efficiency under various load conditions and can meet the working needs of the stack.

As an optional implementation, in S20, convert the operating power into the load condition of the air compressor, including:

According to the mapping relationship between operating power and load conditions, the operating power is converted into the load conditions of the air compressor.

Specifically, there is a mapping relationship between operating power and load conditions, and the operating power is converted into load conditions for the air compressor according to the mapping relationship.

Among them, offline test calibration can be carried out, and the load conditions can be divided according to the actual operating power of the fuel cell and the working status of the air compressor, and the corresponding division thresholds can be obtained. When the value of the operating power meets the division threshold of a certain load condition, the operating power can be converted into the corresponding load condition.

In this embodiment, according to the mapping relationship between operating power and load conditions, the operating power is converted into the load conditions of the air compressor, so that the on-off of components in the air supply system can be more flexibly adjusted according to the load conditions, thereby The air compressor can ensure better working results and improve the working efficiency of the air supply system to a certain extent.

As an optional implementation, the load conditions include a first load condition, a second load condition and a third load condition. In step S30, according to the load conditions, the bypass valve and the scroll end bypass valve are controlled to be on and off, so that the air supply system operates in the corresponding working range, including:

According to the corresponding load conditions, the bypass valve and the scroll end bypass valve are controlled to open or close to control the working status of the turbocharger.

Through the turbocharger, the air supply system is operated in the working range corresponding to the load condition.

Specifically, the load conditions in the embodiment of the present application include the first load condition, the second load condition and the third load condition.

When the operating power is converted to obtain the corresponding load condition, the bypass valve and the scroll end bypass valve are controlled to open or close according to the corresponding load condition, thereby controlling the working status of the turbocharger. Through the turbocharger, the flow and pressure of the air entering the stack are further affected, so that the air supply system works in the working range corresponding to the load condition, thereby meeting the working needs of the stack.

In this embodiment, the working state of the turbocharger is controlled by controlling the opening or closing of the bypass valve and the scroll end bypass valve. The working state of the turbocharger refers to whether the turbocharger is working. Whether the turbocharger works or not will affect the working status of the air compressor downstream of the turbocharger, so that the air supply system can adapt to the work intensity of each load condition and ensure work efficiency to meet the work of the stack. need.

As an optional implementation manner, the load condition is the first load condition. In step S30, according to the load conditions, the bypass valve and the scroll end bypass valve are controlled to be on and off, so that the air supply system operates in the corresponding working range, including:

S41 controls the scroll end bypass valve and the bypass valve to open to control the turbocharger to stop working.

S42 adjusts the working efficiency of the air compressor through the turbocharger.

S43, use the air compressor to make the air supply system work in the working range corresponding to the first load condition.

It should be noted that the pressure ratio of an air compressor is an important parameter of the air compressor, which refers to the ratio of the outlet pressure to the inlet pressure of the air compressor.

Figure 4 shows the on and off conditions of the air supply system when the load condition is the first load condition.

Specifically, if the load condition corresponding to the operating power of the air supply system is the first load condition, the scroll end bypass valve 3 and the bypass valve 6 are controlled to open.

At this time, after the scroll end bypass valve 3 is opened, air does not enter the scroll end of the turbocharger 1, and the turbine cannot rotate. Therefore, the turbocharger 1 does not work, and thus no supercharging is performed.

The air enters the air compressor 4 through the pressure end of the turbocharger 1, and the air compressor 4 pressurizes the air. By adjusting the working efficiency of the air compressor 4, the pressure ratio required for the first load condition is achieved. So that it can meet the working range corresponding to the first load condition, and then meet the working requirements of the stack under the first load condition.

After the bypass valve 6 is opened, part of the pressurized air discharged by the air compressor 4 is discharged from the bypass valve 6, so the air flow entering the stack 9 will become less, and the pressure ratio of the air compressor 4 will also move towards The direction of the high pressure ratio.

The working area of the air supply system corresponds to the operating area of the air compressor 4, which will be described in detail below with reference to FIG. 7 .

FIG. 7 is a schematic diagram showing the air intake characteristics of the stack in the operating area of the air compressor 4 . The rotation speed, flow rate and pressure ratio of the air compressor 4 are tightly coupled, and its operating area is mainly limited by the surge line, rotation speed line and blockage line.

When the load condition is the first load condition, the air intake characteristics of the stack 9 are shown in that the operating area of the air compressor 4 is zone 1 in Figure 7. The air flow entering the stack 9 is small and the air pressure is relatively small. High, the operating effect of the air compressor 4 presents a small flow and high pressure ratio, and effectively avoids the operating area where surge occurs in the air compressor 4.

In this embodiment, by controlling the scroll end bypass valve 3 and the bypass valve 6 to open, the turbocharger 1 is controlled to stop working, and then the operating power of the air compressor 4 is adjusted so that the air intake characteristics of the stack 9 meet the first requirement. The working range corresponding to the first load condition can ensure that the air compressor 4 in the air supply system can adapt to the first load condition without surge, which improves the working efficiency of the air supply system to a certain extent and thus satisfies the needs of the stack in the third load condition. The working requirements of one load condition.

As an optional implementation, the load condition is the second load condition. In step S30, the bypass valve and the scroll end bypass valve are controlled to be on and off according to the load condition, so that the air supply system operates at the corresponding The working area includes:

S51, the control bypass valve is closed.

S52 controls the scroll end bypass valve to open, causing the turbocharger to stop working.

S53, adjust the rotation speed of the air compressor to increase the pressure ratio of the air compressor.

S54, use the air compressor to make the air supply system work in the working range corresponding to the second load condition.

Figure 5 shows the on-off status of the air supply system when the load condition is the second load condition.

Specifically, when the load condition is the second load condition, the bypass valve 6 is controlled to close and the scroll end bypass valve 3 is controlled to open.

When the scroll end bypass valve 3 is opened, air does not enter the scroll end of the turbocharger 1, so the turbocharger 1 stops working.

At this time, the air enters the air compressor 4 through the pressure end of the turbocharger 1, and the rotation speed of the air compressor 4 is controlled to meet the pressure ratio required for the second load condition.

Generally, when the air flow rate entering the air compressor 4 remains unchanged, the higher the rotational speed of the air compressor 4, the greater the pressure ratio.

At this time, the bypass valve 6 is in a closed state, so the air flow flowing into the stack 9 increases compared to the first load condition, and the working requirements of the stack 9 match the second load condition.

When the load condition is the second load condition, the air intake characteristics of the stack 9 are shown in that the operating area of the air compressor 4 is zone 2 in Figure 7, the air flow entering the stack 9 increases significantly, and the pressure ratio With a higher value, the operating effect of air compressor 4 is characterized by decoupling of flow rate and pressure ratio, and the operating effect is more efficient.

In this embodiment, the bypass valve 6 is controlled to close and the scroll end bypass valve 3 is controlled to open, thereby controlling the working state of the turbocharger 1 and adjusting the rotation of the air compressor 4 without reducing the air flow. speed, increase the pressure ratio of the air compressor 4, and make the air supply system as a whole run in a safe and efficient direction.

As an optional implementation, as shown in Figure 2, the air supply system also includes:

The stack exit stop valve 8 is connected to the outlet end of the stack 9 and is used to adjust the pressure ratio of the stack 9 .

After adjusting the rotation speed of the air compressor, the method also includes:

Control the valve opening and closing angle of the stack discharge stop valve to make the air supply system work in the working range corresponding to the second load condition.

Further, the stack exit stop valve 8 is connected to the outlet end of the stack 9 for adjusting the pressure ratio of the stack 9 to meet the working requirements of the stack 9 in the second load condition.

Optionally, by controlling the valve opening and closing angle of the stack outlet stop valve 8, the air supply system can be operated in the working range corresponding to the second load condition, thereby meeting the working needs of the stack 9.

As an optional implementation, the load condition is the third load condition. In step S30, the bypass valve and the scroll end bypass valve are controlled on and off according to the load condition, so that the air supply system operates at the corresponding The working area includes:

S61 controls the scroll end bypass valve and the bypass valve to close, allowing the turbocharger to work, and the air is supercharged through the turbocharger.

S62, control the air compressor to supercharge the air output from the turbocharger, so that the air supply system works in the working range corresponding to the third load condition.

Figure 6 shows the on-off situation of the air supply system when the load condition is the third load condition. The pressure side bypass valve 2 in this embodiment is a differential pressure driven valve.

Specifically, when the load condition is the third load condition, the scroll end bypass valve 3 and the bypass valve 6 are controlled to close.

When the scroll end bypass valve 3 is closed, the gas discharged after the reaction of the stack 9 enters the scroll end of the turbocharger 1 through the stack exit valve 8, thereby driving the turbine in the scroll end to rotate, causing the turbocharger 1 to start Work. Since the pressure-side bypass valve 2 is a differential pressure valve, when the turbine of the turbocharger 1 rotates, a pressure difference is formed between the front and rear of the pressure-side bypass valve 2, causing the pressure-side bypass valve 2 to close, forming a first-stage supercharging. The pressurized air enters the air compressor 4, and is pressurized in two stages at both ends of the air compressor 4, thereby achieving three-stage pressurization.

After the bypass valve 6 is closed, the three-stage pressurized air enters the stack 9. The working efficiency of the air supply system is improved, which can better meet the working needs of the stack 9 under the third load condition.

When the load condition is the third load condition, the air intake characteristics of the stack 9 are shown in the operating area of the air compressor 4 as zone 3 in Figure 7 . The air intake characteristics of the stack 9 exhibit the effect of large flow rate and high pressure ratio.

In this embodiment, by controlling the bypass valve 6 and the scroll end bypass valve 3 to close, the working state of the air supply system is adjusted to meet the needs of the stack 9 under the third load condition, and it is possible to consume no additional electric power. On the basis of meeting the demand for high operating power, it further improves the efficiency of the air supply system.

The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operations of possible implementations of systems, methods, and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code that contains one or more logic functions that implement the specified executable instructions. It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown one after another may actually execute substantially in parallel, or they may sometimes execute in the reverse order, depending on the functionality involved. It will also be noted that each block in the block diagram or flowchart illustration, and combinations of blocks in the block diagram or flowchart illustration, can be implemented by special purpose hardware-based systems that perform the specified functions or operations, or may be implemented by special purpose hardware-based systems that perform the specified functions or operations. Achieved by a combination of specialized hardware and computer instructions.

It should be noted that although several modules or units of equipment for action execution are mentioned in the above detailed description, this division is not mandatory. In fact, according to the embodiments of the present application, the features and functions of two or more modules or units described above may be embodied in one module or unit. Conversely, the features and functions of one module or unit described above may be further divided into being embodied by multiple modules or units.

Other embodiments of the present application will be readily apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary technical means in the technical field that are not disclosed in this application. .

It is to be understood that the present application is not limited to the precise structures described above and illustrated in the accompanying drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims (9)

1. An air supply system, the air supply system is used to provide air for a fuel cell, characterized in that the air supply system includes: An air compressor, used to pressurize the air entering the air compressor; A turbocharger, the pressure end of the turbocharger is connected to the first end of the air compressor, used to pressurize the air and send the pressurized air to the air compressor; Electric pile, the inlet end of the electric pile is connected to the air compressor, the outlet end of the electric pile is connected to the turbine end of the turbocharger, the turbocharger, the air compressor, The electric stacks are connected in sequence to form a closed loop, and the electric stacks are used to perform a reduction reaction on the air output by the air compressor; Bypass valve, the first end of the bypass valve is connected to the second end of the air compressor, the second end of the bypass valve is connected to the scroll end of the turbocharger, and is used to circulate the The air output by the air compressor; Pressure end bypass valve, the first end of the pressure end bypass valve is connected to the pressure end of the turbocharger, and the second end of the pressure end bypass valve is connected to the first end of the air compressor connect; A scroll end bypass valve, a first end of which is connected to the passage between the stack and the turbocharger, and a second end of which is connected to the turbine Supercharger scroll end connection. 2. The air supply system according to claim 1, characterized in that the air supply system further includes: Intercooler, the first end of the intercooler is connected to the second end of the air compressor; A stack entry cut-off valve, the first end of the stack entry cut-off valve is connected to the second end of the intercooler, and the second end of the stack entry cut-off valve is connected to the inlet end of the stack; A stack outlet stop valve, a first end of which is connected to the outlet end of the stack, and a second end of which is connected to the scroll end of the turbocharger. 3. The air supply system according to claim 2, characterized in that the air supply system includes: The first end of the bypass valve is connected to the passage between the intercooler and the stack entry stop valve; The first end of the scroll end bypass valve is connected to the passage between the stack outlet stop valve and the turbocharger. 4. A control method for an air supply system, characterized in that the air supply system includes: Turbocharger, used to supercharge the air; An air compressor, connected to the turbocharger, is used to supercharge the air output by the turbocharger; A bypass valve, connected downstream of the air compressor, used to adjust the flow rate of air output by the air compressor; A scroll end bypass valve, located at the scroll end of the turbocharger, used to control the working state of the turbocharger; The electric stack has an inlet end connected to the air compressor and an outlet end connected to the turbocharger for reducing air; The methods include: receiving operating power of the air supply system; The operating power is converted into a load condition of the air compressor. The load condition is the relationship between the pressure ratio of the air compressor and the air flow rate. The load condition includes a first load condition, a third load condition, and a first load condition. Second load condition and third load condition; Control the bypass valve and the scroll end bypass valve to open or close according to the corresponding load conditions to control the working state of the turbocharger; Through the turbocharger, the air supply system is caused to operate in a working range corresponding to the load condition. 5. The control method of the air supply system according to claim 4, characterized in that said converting the operating power into the load condition of the air compressor includes: According to the mapping relationship between the operating power and the load condition, the operating power is converted into the load condition of the air compressor. 6. The control method of the air supply system according to claim 4, characterized in that when the load condition is the first load condition, the bypass valve and the bypass valve are controlled according to the load condition. The scroll end bypass valve is turned on and off to make the air supply system operate in the corresponding working range, including: Control the scroll end bypass valve and the opening of the bypass valve to control the turbocharger to stop working; Adjust the working state of the air compressor through the turbocharger; Through the air compressor, the air supply system is made to operate in a working range corresponding to the first load condition. 7. The control method of the air supply system according to claim 4, characterized in that when the load condition is the second load condition, the bypass valve and the bypass valve are controlled according to the load condition. The scroll end bypass valve is turned on and off to make the air supply system operate in the corresponding working range, including: Control the bypass valve to close; Control the scroll end bypass valve to open to stop the turbocharger from working; Adjust the rotation speed of the air compressor to increase the pressure ratio of the air compressor; Through the air compressor, the air supply system is made to operate in a working range corresponding to the second load condition. 8. The control method of the air supply system according to claim 7, characterized in that the air supply system further includes: The stack exit stop valve is connected to the outlet end of the stack and is used to adjust the pressure ratio of the stack; After adjusting the rotation speed of the air compressor, the method further includes: Control the valve opening and closing angle of the stack discharge stop valve to make the air supply system work in the working range corresponding to the second load condition. 9. The control method of the air supply system according to claim 4, characterized in that when the load condition is the third load condition, the bypass valve and the bypass valve are controlled according to the load condition. The scroll end bypass valve is turned on and off to make the air supply system operate in the corresponding working range, including: Control the scroll end bypass valve and the bypass valve to close, so that the turbocharger operates, and the air is supercharged through the turbocharger; The air compressor is controlled to supercharge the air output by the turbocharger, so that the air supply system operates in a working range corresponding to the third load condition.