阅读说明：本技术 燃料电池系统的怠速控制方法及相关设备 (Idle speed control method of fuel cell system and related apparatus ) 是由 马义 陈明 张剑 熊成勇 李学锐 于 2021-06-18 设计创作，主要内容包括：本说明书实施例公开了一种燃料电池系统的怠速控制方法,包括：判断燃料电池系统是否处于怠速运行工况；当燃料电池系统处于怠速运行工况时,控制耗能设备的运行功率增大,以减小燃料电池系统的净输出功率；其中,耗能设备包括加热器、空气压缩机、散热风扇、水泵和氢泵中至少之一。本说明书实施例能够根据燃料电池系统的需求,控制不同的耗能设备运行,也即是通过不同的耗能设备来消耗燃料电池系统在怠速运行工况下电堆的最小输出功率,从而降低燃料电池系统的净输出功率,提高燃料电池系统在怠速运行工况下净输出功率的稳定性,延长电堆的使用寿命,同时提高燃料电池系统的怠速控制方法的灵活性。(An embodiment of the present specification discloses an idle speed control method of a fuel cell system, including: judging whether the fuel cell system is in an idle running working condition or not; when the fuel cell system is in an idle running working condition, controlling the running power of the energy consumption equipment to increase so as to reduce the net output power of the fuel cell system; wherein the energy consuming device comprises at least one of a heater, an air compressor, a cooling fan, a water pump and a hydrogen pump. According to the embodiment of the specification, different energy consumption devices can be controlled to operate according to the requirements of the fuel cell system, namely, the minimum output power of the fuel cell system under the idle speed operation condition is consumed through the different energy consumption devices, so that the net output power of the fuel cell system is reduced, the stability of the net output power of the fuel cell system under the idle speed operation condition is improved, the service life of the fuel cell system is prolonged, and meanwhile, the flexibility of the idle speed control method of the fuel cell system is improved.)

1. An idle speed control method of a fuel cell system, characterized by comprising:

judging whether the fuel cell system is in an idle running working condition or not;

when the fuel cell system is in the idle running working condition, controlling the running power of the energy consumption equipment to increase so as to reduce the net output power of the fuel cell system;

wherein the energy consuming device comprises at least one of a heater, an air compressor, a cooling fan, a water pump, and a hydrogen pump.

2. The idle speed control method of the fuel cell system according to claim 1, wherein the controlling the operating power of the energy consuming device to be increased when the fuel cell system is in the idle operation condition comprises:

when the fuel cell system is in the idle running working condition, judging whether the heater is in a running state;

controlling the operation power of the heater to be increased when the heater is in an operation state;

and when the heater is in a non-operation state, controlling at least one of the operation power of the air compressor, the operation power of the heat radiation fan, the operation power of the water pump and the operation power of the hydrogen pump to increase.

3. The idle speed control method of the fuel cell system according to claim 2, wherein the controlling the operating power of the energy consuming device to be increased when the fuel cell system is in the idle operation condition further comprises:

when the heater is in an operating state, acquiring the temperature of the galvanic pile;

judging whether the temperature of the galvanic pile is greater than or equal to a preset temperature or not;

and when the temperature of the electric pile is greater than or equal to the preset temperature, controlling at least one of the operating power of the air compressor, the operating power of the heat dissipation fan, the operating power of the water pump and the operating power of the hydrogen pump to increase.

4. The idle speed control method of the fuel cell system according to claim 2 or 3, wherein the controlling at least one of the operating power of the air compressor, the operating power of the radiator fan, the operating power of the water pump, and the operating power of the hydrogen pump to be increased includes:

controlling at least one of the operation power of the heat radiation fan, the operation power of the water pump and the operation power of the hydrogen pump to increase;

acquiring net output power of the fuel cell system;

judging whether the net output power of the fuel cell system is larger than a set threshold value;

and when the net output power of the fuel cell system is larger than the set threshold value, the running power of the air compressor is increased.

5. The idle speed control method of the fuel cell system according to claim 2 or 3, wherein the controlling at least one of the operating power of the air compressor, the operating power of the radiator fan, the operating power of the water pump, and the operating power of the hydrogen pump to be increased includes:

controlling the rotation speed of the air compressor to increase, and/or controlling the rotation speed of the heat radiation fan to increase, and/or controlling the rotation speed of the water pump to increase, and/or controlling the rotation speed of the hydrogen pump to increase.

6. The idle speed control method of the fuel cell system according to claim 3, wherein the fuel cell system includes a radiator, and the controlling the operating power of the energy consuming device to be increased when the fuel cell system is in the idle operation condition further comprises:

when the temperature of the electric pile is greater than or equal to a preset temperature, controlling the radiator to exchange heat with the heater;

wherein the preset temperature is between 0 and 40 degrees centigrade.

7. The idle speed control method of a fuel cell system according to claim 5, wherein the fuel cell system includes a pressure relief valve and a back pressure valve, and the controlling of the rotation speed of the air compressor after increasing further comprises:

and adjusting the opening degree of the pressure relief valve and/or the backpressure valve.

8. An idle speed control apparatus of a fuel cell system, characterized by comprising:

the judging unit is used for judging whether the fuel cell system is in an idle running working condition or not;

a control unit for controlling the operating power of the energy consuming device to increase to reduce the net output power of the fuel cell system when the fuel cell system is in the idle operating condition;

wherein the energy consuming device comprises at least one of a heater, an air compressor, a cooling fan, a water pump, and a hydrogen pump.

9. An electronic device comprising a processor, a memory, and a program or instructions stored on the memory and executable on the processor, the program or instructions when executed by the processor implementing the steps of the idle speed control method of the fuel cell system according to any one of claims 1 to 7.

10. A readable storage medium characterized in that the storage medium stores a program that, when executed, is capable of implementing the steps of the idle speed control method of the fuel cell system according to any one of claims 1 to 7.

Technical Field

The embodiment of the specification relates to the technical field of fuel cell systems, in particular to an idle speed control method of a fuel cell system and related equipment.

Background

After the fuel cell system is started, if the vehicle does not give a running instruction, or the vehicle temporarily stops due to red light, traffic jam and the like, the fuel cell system does not need to output power to the vehicle and can enter an idling operation working condition.

And under the idle running condition of the fuel cell system, the minimum output power of the electric pile exists. The prior art generally controls the operation of the heater to consume the minimum output power of the stack during idle operation of the fuel cell system.

At present, when a heater is not arranged in a fuel cell system or the heater in the fuel cell system cannot operate due to a fault, the minimum output power of a stack cannot be consumed, so that the output power of the fuel cell system to a vehicle cannot be reduced, the service life of the stack is influenced, and the operation reliability of the fuel cell system is reduced.

Disclosure of Invention

The embodiments of the present specification aim to solve the technical problem that the minimum output power of the fuel cell system cannot be consumed when the heater fails.

The embodiment of the specification provides an idle speed control method of a fuel cell system and related equipment.

In a first aspect, an embodiment of the present specification provides an idle speed control method of a fuel cell system, including: judging whether the fuel cell system is in an idle running working condition or not; when the fuel cell system is in an idle running working condition, controlling the running power of the energy consumption equipment to increase so as to reduce the net output power of the fuel cell system; wherein the energy consuming device comprises at least one of a heater, an air compressor, a cooling fan, a water pump and a hydrogen pump.

Optionally, when the fuel cell system is in the idle operation condition, controlling the operation power of the energy consumption device to increase includes: when the fuel cell system is in an idle running working condition, judging whether the heater is in a running state; when the heater is in the running state, controlling the running power of the heater to increase; and controlling at least one of the operating power of the air compressor, the operating power of the radiator fan, the operating power of the water pump and the operating power of the hydrogen pump to be increased when the heater is in a non-operating state.

Optionally, when the fuel cell system is in the idle operation condition, controlling the operating power of the energy consumption device to increase, further comprising: when the heater is in an operating state, acquiring the temperature of the galvanic pile; judging whether the temperature of the galvanic pile is greater than or equal to a preset temperature or not; and when the temperature of the electric pile is greater than or equal to the preset temperature, controlling at least one of the operating power of the air compressor, the operating power of the cooling fan, the operating power of the water pump and the operating power of the hydrogen pump to increase.

Optionally, controlling at least one of the operation power of the air compressor, the operation power of the cooling fan, the operation power of the water pump, and the operation power of the hydrogen pump to increase includes: controlling at least one of the operating power of the cooling fan, the operating power of the water pump and the operating power of the hydrogen pump to increase; acquiring net output power of the fuel cell system; judging whether the net output power of the fuel cell system is larger than a set threshold value; when the net output power of the fuel cell system is greater than a set threshold, the operating power of the air compressor is increased.

Optionally, controlling at least one of the operation power of the air compressor, the operation power of the cooling fan, the operation power of the water pump, and the operation power of the hydrogen pump to increase includes: controlling the rotation speed of the air compressor to increase, and/or controlling the rotation speed of the cooling fan to increase, and/or controlling the rotation speed of the water pump to increase, and/or controlling the rotation speed of the hydrogen pump to increase.

Optionally, the fuel cell system includes a radiator, and when the fuel cell system is in an idle operation condition, the operation power of the energy consumption device is controlled to be increased, and the method further includes: when the temperature of the electric pile is greater than or equal to the preset temperature, controlling the heat radiator to exchange heat with the heater; wherein the preset temperature is between 0 and 40 ℃.

Optionally, the fuel cell system includes a pressure release valve and a back pressure valve, and after controlling the rotation speed of the air compressor to increase, the fuel cell system further includes: and adjusting the opening degree of the pressure relief valve and/or the backpressure valve.

In a second aspect, an embodiment of the present specification provides an idle speed control apparatus of a fuel cell system, including: the judging unit is used for judging whether the fuel cell system is in an idle running working condition or not; the control unit is used for controlling the running power of the energy consumption equipment to be increased when the fuel cell system is in an idle running working condition so as to reduce the net output power of the fuel cell system; wherein the energy consuming device comprises at least one of a heater, an air compressor, a cooling fan, a water pump and a hydrogen pump.

In a third aspect, the present specification provides an electronic device, which includes a processor, a memory, and a program or an instruction stored in the memory and executable on the processor, wherein the program or the instruction, when executed by the processor, implements the steps of the idle speed control method of the fuel cell system of the first aspect.

In a fourth aspect, embodiments of the present specification provide a readable storage medium storing a program that, when executed, is capable of implementing the steps of the idle speed control method of the fuel cell system according to the first aspect described above.

The embodiment of the specification has the following beneficial effects:

in the embodiment of the specification, when the fuel cell system is in the idle operation condition, the operation power of the energy consumption device is controlled to be increased, that is, the operation power of at least one of the heater, the air compressor, the cooling fan, the water pump and the hydrogen pump is controlled to be increased, so that the operation of different energy consumption devices is controlled according to the requirement of the fuel cell system, that is, the minimum output power of the fuel cell stack of the fuel cell system under the idle operation condition is consumed by different energy consumption devices, so that the net output power of the fuel cell system under the idle operation condition is reduced, the stability of the net output power of the fuel cell system under the idle operation condition is improved, the service life of the fuel cell stack is prolonged, and the flexibility of the idle control method of the fuel cell system is improved.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the specification. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

FIG. 1 is a flow chart illustrating one embodiment of a method for controlling an idle speed of a fuel cell system;

FIG. 2 is a second flowchart illustrating steps of an idle speed control method of a fuel cell system according to an embodiment of the present disclosure;

FIG. 3 is a third flowchart illustrating the steps of an idle speed control method of a fuel cell system according to an embodiment of the present disclosure;

FIG. 4 is a schematic diagram illustrating a variation curve of maximum operating power of a heater according to an embodiment of the present disclosure;

FIG. 5 is a flowchart illustrating a fourth step of an idle speed control method of a fuel cell system according to an exemplary embodiment of the present disclosure;

FIG. 6 is a schematic structural diagram of an idle speed control device of a fuel cell system according to an embodiment of the present disclosure;

FIG. 7 is a block diagram illustrating an electronic device according to an embodiment of the disclosure;

FIG. 8 is a schematic structural diagram of a fuel cell system according to an embodiment of the present disclosure;

FIG. 9 is a flow chart illustrating the steps of an idle speed control method of a fuel cell system according to an embodiment of the present disclosure;

FIG. 10 is a schematic representation of an embodiment of an air compressor operating power variation provided herein;

fig. 11 is a second schematic structural diagram of a fuel cell system according to an embodiment of the present disclosure;

fig. 12 is a flowchart illustrating steps of an idle speed control method of a fuel cell system according to an embodiment of the present disclosure.

Wherein, the correspondence between the reference numbers and the part names in fig. 6 to 8 and 11 is:

100: fuel cell system, 102: back pressure valve, 104: pressure relief valve, 106: proportional valve, 108: hydrogen discharge valve, 110: galvanic pile, 112: temperature-pressure sensor, 114: control valve, 120: air compressor, 140: gas-liquid separator, 150: hydrogen pump, 160: a water pump, 170: controller, 180: heat sink, 210: determination unit, 220: control unit, 310: memory, 320: a processor.

Detailed Description

In order to better understand the technical solutions, the technical solutions of the embodiments of the present specification are described in detail below with reference to the drawings and specific embodiments, and it should be understood that the specific features of the embodiments and embodiments of the present specification are detailed descriptions of the technical solutions of the embodiments of the present specification, and are not limitations of the technical solutions of the present specification, and the technical features of the embodiments and embodiments of the present specification may be combined with each other without conflict.

In a first aspect, an embodiment of the present application provides an idle speed control method of a fuel cell system, which may be implemented as shown in fig. 1, and the method includes the following steps:

step S101, judging whether the fuel cell system is in an idle running working condition or not;

and S102, when the fuel cell system is in an idle running working condition, controlling the running power of the energy consumption equipment to be increased so as to reduce the net output power of the fuel cell system.

Wherein the energy consuming device comprises at least one of a heater, an air compressor, a cooling fan, a water pump and a hydrogen pump.

It can be understood that, after the fuel cell system is started, when the vehicle does not give a running instruction to the fuel cell system, or when the vehicle temporarily stops due to red light, traffic jam and the like, the fuel cell system does not need to output power to the vehicle, and enters an idle running condition.

In some examples, whether the fuel cell system enters the idle operation condition or not may be determined according to the operation state of the vehicle, and whether the fuel cell system enters the idle operation condition or not may also be determined according to the operation state of the fuel cell system, so that the flexibility of the idle speed control method of the fuel cell system is improved.

It is understood that the net output power of the fuel cell system is the difference between the output power of the stack and the operating power of the energy consuming device.

When the fuel cell system enters an idle running condition, the electric pile has minimum output power. Under the idle running condition, the fuel cell system does not need to output power to the vehicle, so that the running power of energy consumption equipment needs to be increased to consume the minimum output power of the electric pile, the net output power of the fuel cell system can be reduced, and the output power of the fuel cell system to the vehicle is also reduced.

In some examples, by increasing the operating power of the energy consuming device, the net output power of the fuel cell system may be reduced to zero, that is, the output power of the fuel cell system for the vehicle under the idle operating condition may be zero, so as to further improve the reliability of the fuel cell system under the idle operating condition.

The energy consumption equipment comprises at least one of a heater, an air compressor, a cooling fan, a water pump and a hydrogen pump, so that different energy consumption equipment can be controlled to operate according to different requirements of the fuel cell system, the minimum output power of the electric pile can be consumed, the net output power of the fuel cell system under the idle operation working condition is reduced, the stability of the net output power of the fuel cell system under the idle operation working condition is improved, the service life of the electric pile is prolonged, and the flexibility of the idle speed control method of the fuel cell system is improved.

In some examples, as shown in fig. 2, controlling the operating power of the energy consuming device to increase when the fuel cell system is in the idle operating condition includes:

step S201, when the fuel cell system is in an idling operation condition, judging whether a heater is in an operation state;

step S202, when the heater is in the running state, controlling the running power of the heater to increase;

and step S203, when the heater is in a non-operation state, controlling at least one of the operation power of the air compressor, the operation power of the cooling fan, the operation power of the water pump and the operation power of the hydrogen pump to increase. When the fuel cell system is in the idle running working condition, whether the heater is in the running state or not is judged firstly. When the heater is in the operation state, the operation power of the heater is controlled to be increased. It can be understood that since the maximum operating power of the heater is large, the net output power of the fuel cell system can be reduced and the operating reliability of the fuel cell system can be improved by increasing the operating power of the heater to consume the minimum output power of the stack.

And controlling at least one of the operating power of the air compressor, the operating power of the radiator fan, the operating power of the water pump and the operating power of the hydrogen pump to be increased when the heater is in a non-operating state. Specifically, the air compressor is used for compressing air, the cooling fan is used for cooling the fuel cell system, the water pump is used for driving refrigerant circulation in the fuel cell system, and the hydrogen pump is used for driving hydrogen circulation in the fuel cell system.

It is to be understood that the heater may be in a non-operating state, the heater may be in a non-operating state due to a failure or the like, or the fuel cell system may not include the heater.

When the heater is in a non-operating state, the fuel cell system cannot consume the minimum output power of the stack through the heater. Therefore, the operation power of at least one of the air compressor, the cooling fan, the water pump and the hydrogen pump is controlled to be increased, the minimum output power of the electric pile of the fuel cell system under the idling operation working condition is consumed, and the operation reliability of the fuel cell system is improved.

It can be understood that when the heater is in the non-operation state, the operation power of the water pump, the hydrogen pump or the cooling fan can be controlled to increase, and then whether the minimum output power of the electric pile is completely consumed or not can be judged. And if the minimum output power of the electric pile can be completely consumed, keeping the operation power of the air compressor unchanged, and if the minimum output power of the electric pile cannot be completely consumed, controlling the operation power of the air compressor to be increased.

The operating power of at least one of the air compressor, the cooling fan, the water pump and the hydrogen pump is controlled to be increased under the condition that the minimum output power of the electric pile is consumed, so that the operating state of energy consumption equipment is controlled according to the net output power of the fuel cell system, the energy consumption of the fuel cell system is reduced, and the operating reliability of the fuel cell system is further improved. The operation power of the heater is increased when the heater is in an operation state, and the operation power of at least one of the air compressor, the cooling fan, the water pump and the hydrogen pump is increased when the heater is in a non-operation state, so that the fuel cell system controls the operation power of different energy consumption equipment to be increased according to the operation state of the heater to consume the minimum output power of the electric pile, the minimum output power of the electric pile can be further consumed, the operation reliability and the use flexibility of the fuel cell system are improved, meanwhile, the energy consumption of the fuel cell system can be reduced, and the use performance of the fuel cell system is improved.

In some examples, as shown in fig. 3, controlling the operating power of the energy consuming device to increase when the fuel cell system is in the idle operating condition further includes:

step S301, when the heater is in an operating state, acquiring the temperature of the galvanic pile;

step S302, judging whether the temperature of the galvanic pile is greater than or equal to a preset temperature;

and step S303, when the temperature of the electric pile is greater than or equal to the preset temperature, controlling at least one of the operation power of the air compressor, the operation power of the cooling fan, the operation power of the water pump and the operation power of the hydrogen pump to increase. It can be understood that the heater exchanges heat with the electric pile through a refrigerant. As the temperature of the stack is higher, the temperature of the refrigerant flowing out of the stack is higher, and thus the temperature of the refrigerant flowing into the heater is higher, as shown in fig. 4, the maximum operation power of the heater is also lower.

When the heater is in the running state, the temperature of the galvanic pile is obtained, and whether the temperature of the galvanic pile is larger than or equal to the preset temperature or not is judged. When the temperature of the electric pile is larger than or equal to the preset temperature, the maximum operating power of the heater is lower, and the minimum output power of the electric pile cannot be completely consumed, so that when the temperature of the electric pile is larger than the preset temperature, the operating power of at least one of the air compressor, the cooling fan, the water pump and the hydrogen pump needs to be controlled to be increased, the minimum output power of the electric pile is further consumed, the net output power of the fuel cell system is reduced, the stability of the net output power of the fuel cell system under the idling operating condition is improved, the service life of the electric pile is prolonged, and the operating reliability of the fuel cell system is improved.

It can be understood that when the temperature of the stack is greater than or equal to the preset temperature, the operation power of the water pump, the hydrogen pump, the cooling fan or other devices may be controlled to increase, and then it is determined whether the minimum output power of the stack is completely consumed. And if the minimum output power of the electric pile can be completely consumed, keeping the operation power of the air compressor unchanged, and if the minimum output power of the electric pile cannot be completely consumed, controlling the operation power of the air compressor to be increased.

The operating power of at least one of the air compressor, the cooling fan, the water pump and the hydrogen pump is controlled to be increased under the condition that the minimum output power of the electric pile is consumed, so that the operating state of energy consumption equipment is controlled according to the net output power of the fuel cell system, the energy consumption of the fuel cell system is reduced, and the operating reliability of the fuel cell system is further improved.

When the temperature of the electric pile is larger than or equal to the preset temperature, the operating power of at least one of the air compressor, the cooling fan, the water pump and the hydrogen pump is controlled to be increased, when the maximum operating power of the heater is reduced due to the temperature rise of the electric pile, the minimum output power of the electric pile cannot be completely consumed by the heater, the stability of the net output power of the fuel cell system under the idling operating condition is further improved, the operating reliability of the fuel cell system is improved, meanwhile, the energy consumption of the fuel cell system can be reduced, and the service performance of the fuel cell system is improved. It can be understood that when the temperature of the stack is less than the preset temperature, the operation power of the heater can be controlled to increase, and the operation power of the air compressor, the radiator fan, the water pump and the hydrogen pump is controlled to be unchanged, so that the energy consumption of the fuel cell system is further reduced.

In some examples, as shown in fig. 5, controlling at least one of the operating power of the air compressor, the operating power of the radiator fan, the operating power of the water pump, and the operating power of the hydrogen pump to increase includes:

step S401, controlling at least one of the operation power of the cooling fan, the operation power of the water pump and the operation power of the hydrogen pump to increase;

step S402, acquiring net output power of the fuel cell system;

step S403, determining whether the net output power of the fuel cell system is greater than a set threshold;

and step S404, when the net output power of the fuel cell system is larger than a set threshold value, increasing the running power of the air compressor.

And controlling at least one of the operation power of the heat radiation fan, the operation power of the water pump and the operation power of the hydrogen pump to increase, and then acquiring the net output power of the fuel cell system. It is determined whether the net output power of the fuel cell system at this time is greater than a set threshold, which may be, understandably, 0 kw.

If the net output power of the fuel cell system is larger than the set threshold, it indicates that the minimum output power of the electric pile cannot be completely consumed by increasing the operation power of the heat radiation fan, the water pump and the hydrogen pump, and the operation power of the air compressor needs to be controlled to be increased, so that the minimum output power of the electric pile is further consumed, and the net output power of the fuel cell system can be continuously reduced.

It is understood that, of course, when the net output power of the fuel cell system is less than or equal to the set threshold, it means that the minimum output power of the stack system can be consumed by increasing the operating power of the heat dissipation fan, the water pump and the hydrogen pump, so that the operating power of the air compressor does not need to be controlled to be increased, and the energy consumption of the fuel cell system is reduced.

After the operating power of at least one of the cooling fan, the water pump and the hydrogen pump is controlled and controlled to be increased, the relation between the net output power of the fuel cell system and the set threshold value is judged, so that the operating state of the air compressor is controlled, the operating state of the energy consumption equipment is controlled according to the net output power of the fuel cell system, the power consumption of the fuel cell system is further reduced, and the operating reliability of the fuel cell system is improved.

In some examples, controlling at least one of the operating power of the air compressor, the operating power of the radiator fan, the operating power of the water pump, and the operating power of the hydrogen pump to increase includes: controlling the rotation speed of the air compressor to increase, and/or controlling the rotation speed of the cooling fan to increase, and/or controlling the rotation speed of the water pump to increase, and/or controlling the rotation speed of the hydrogen pump to increase.

The operating power of the air compressor, the cooling fan, the water pump and the hydrogen pump is increased by increasing the rotating speed of the air compressor, the cooling fan, the water pump and the hydrogen pump, the control is easy, the response speed of the fuel cell system is improved, different operating powers of energy consumption equipment can be increased by adjusting different rotating speeds of the air compressor, the cooling fan, the water pump and the hydrogen pump, different operating requirements of the fuel cell system are met, and the flexibility of an idle speed control method of the fuel cell system is improved.

In some examples, the fuel cell system includes a radiator that controls an increase in operating power of the energy consuming device when the fuel cell system is in an idle operating condition, and further includes:

when the temperature of the electric pile is greater than or equal to the preset temperature, controlling the heat radiator to exchange heat with the heater;

wherein the preset temperature is between 0 and 40 ℃.

It can be understood that, when the temperature of the stack is greater than or equal to the preset temperature, the heat sink is controlled to exchange heat with the heater, so as to reduce the temperature of the heater, that is, reduce the temperature of the stack, increase the maximum operating power of the heater, enhance the consumption effect of the heater on the minimum output power of the stack, and reduce the net output power of the fuel cell system.

When the temperature of the galvanic pile is greater than or equal to the preset temperature, the radiator is controlled to exchange heat with the heater, so that the temperature of the heater is reduced, the maximum operation power of the heater is improved, the minimum output power of the galvanic pile of the fuel cell system under the idling operation condition can be consumed, and the operation reliability of the fuel cell system is improved.

It will be appreciated that different preset temperatures may be set depending on different operating requirements of the fuel cell system. In some examples, the preset temperature may be 25 degrees celsius, 30 degrees celsius, or 35 degrees celsius.

The temperature is preset between 0 ℃ and 40 ℃ through setting, so that the radiator can timely exchange heat with the heater, the heater is prevented from being damaged due to overhigh temperature, meanwhile, the situation that the minimum output power of the galvanic pile cannot be completely consumed due to too low maximum operating power of the heater is avoided, and the operating reliability of the fuel cell system is further improved.

In some examples, the fuel cell system includes a pressure relief valve and a back pressure valve, and after controlling the rotation speed of the air compressor to increase, further includes: and adjusting the opening degree of the pressure relief valve and/or the backpressure valve.

The fuel cell system includes a pressure relief valve and a back pressure valve, which are understandably connected to the outlet of the air compressor for regulating the flow and pressure at the outlet of the air compressor.

It will be appreciated that the flow and pressure at the outlet of the air compressor will increase after the speed of the air compressor is controlled to increase. Therefore, the opening degree of the pressure release valve and/or the backpressure valve is adjusted, the pressure of the outlet of the air compressor can be reduced, air is discharged out of the fuel cell system, the influence on the normal operation of the fuel cell system due to the overlarge flow and pressure of the outlet of the air compressor is avoided, and the operation reliability of the fuel cell system is further improved.

In some examples, the opening degree of the pressure relief valve and/or the back pressure valve can be adjusted according to the operation requirement of the fuel cell system, so that the air flow and the pressure at the outlet of the air compressor can meet the use requirement of the electric pile, and the applicability of the idling control method of the fuel cell system is improved.

In a second aspect, as shown in fig. 6, based on the same inventive concept of the above method, embodiments of the present specification provide an idle speed control device of a fuel cell system, which achieves the functions and effects as the idle speed control method of the fuel cell system of the first aspect, and therefore has all the advantages of the first aspect, and will not be described herein again.

Specifically, the idle speed control apparatus of the fuel cell system includes a determination unit 210 and a control unit 220. The determination unit 210 is used for determining whether the fuel cell system is in the idle operation condition. The control unit 220 is configured to control the operating power of the energy consuming device to be increased to reduce the net output power of the fuel cell system when the fuel cell system is in the idle operating condition. Wherein the energy consuming device comprises at least one of a heater, an air compressor, a cooling fan, a water pump and a hydrogen pump.

In a third aspect, as shown in fig. 7, based on the same inventive concept as the idle speed control method of the fuel cell system, an embodiment of the present specification provides an electronic device, which includes a processor 320, a memory 310 and a program or instructions stored in the memory 310 and executable on the processor 320, and the program or instructions, when executed by the processor 320, implement the steps of the idle speed control method of the fuel cell system according to the first aspect, so that all the advantages of the first aspect are achieved, and are not described herein again.

In a fourth aspect, based on the same inventive concept as the idle speed control method of the fuel cell system, embodiments of the present specification provide a readable storage medium storing a program, which when executed, can implement the steps of the idle speed control method of the fuel cell system according to the first aspect, and therefore, all the advantageous effects of the first aspect are achieved, and are not repeated herein.

One embodiment of the present application provides a method of idle speed control for a fuel cell system. As shown in fig. 8, the fuel cell system 100 is a hydrogen-oxygen fuel cell system, and hydrogen and oxygen react in the stack 110 to generate electric power. Specifically, the fuel cell system 100 includes an air system and a hydrogen system.

The air system comprises an air inlet branch and an air outlet branch, wherein the air inlet branch is used for inputting air into the electric pile 110, and the air outlet branch is used for discharging the air in the electric pile 110. The air compressor 120 is provided in the air intake branch, and the outside air is compressed by the air compressor 120 and then flows into the stack 110. The backpressure valve 102 is disposed in the air exhaust branch for controlling the flow rate of the air exhaust branch. The pressure relief valve 104 is connected with the air inlet branch and the air outlet branch, so that the air discharged from the air compressor 120 can directly flow to the air outlet branch via the pressure relief valve 104 and finally is discharged out of the fuel cell system 100 without flowing through the stack 110, thereby realizing flexible control of the air flow input to the stack 110.

In some examples, the pressure relief valve 104 may be a one-way valve, which is communicated in a one-way direction from the air inlet branch to the air outlet branch, and prevents air in the air outlet branch from flowing back to the air inlet branch via the pressure relief valve 104.

The hydrogen system comprises a hydrogen inlet branch and a hydrogen outlet branch. The hydrogen inlet branch is used for inputting hydrogen into the stack 110, and the hydrogen outlet branch is used for discharging hydrogen, nitrogen, impurities and the like in the stack 110. As will be appreciated, the impurity is water produced by the reaction of hydrogen and oxygen.

A proportional valve 106 is provided on the hydrogen gas intake branch passage for controlling the intake flow rate of hydrogen gas. The hydrogen discharge valve 108 is disposed on the hydrogen discharge branch for controlling the flow rate of the hydrogen discharge branch. The gas-liquid separator 140 is provided in the hydrogen gas exhaust branch passage, and separates gas and impurities discharged from the hydrogen gas exhaust branch passage. The hydrogen system also comprises a hydrogen circulation branch, and the hydrogen circulation branch is connected with the hydrogen inlet branch and the hydrogen exhaust branch. The hydrogen pump 150 is arranged on the hydrogen circulation branch, and the gas separated by the gas-liquid separator 140 enters the galvanic pile 110 again under the driving action of the hydrogen pump 150, so that the hydrogen is recycled. It is understood that the impurities separated by the gas-liquid separator 140 are discharged out of the fuel cell system 100 through the hydrogen discharge valve 108 when the hydrogen discharge valve 108 is opened.

The fuel cell system 100 further includes a water pump 160, a control valve 114, a heater 130, and a radiator 180. The water pump 160 is used to drive the refrigerant to circulate in the refrigerant pipeline. The control valve 114 is used to control a flow path of the refrigerant, so that the heat sink 180 can exchange heat with the stack 110 and/or the heater 130.

In some examples, the fuel cell system 100 further includes at least one temperature and pressure sensor 112, and the at least one temperature and pressure sensor 112 is configured to detect a temperature and a pressure of air, hydrogen gas, or a cooling medium.

In some examples, the fuel cell system 100 further includes a controller 170, and the controller 170 is electrically connected to the air compressor 120, the backpressure valve 102, the pressure relief valve 104, the stack 110, the proportional valve 106, the hydrogen exhaust valve 108, the hydrogen pump 150, the temperature and pressure sensor 112, the water pump 160, the heater 130, the control valve 114, and the like, so as to realize automatic control of the fuel cell system 100.

As shown in fig. 9, the idle speed control method of the fuel cell system includes:

step S501, when the fuel cell system enters an idling operation condition, detecting the temperature of a refrigerant flowing into a galvanic pile;

step S502, judging whether the temperature of the refrigerant flowing into the electric pile is less than a preset temperature;

if yes, executing step S503, if no, executing step S504;

step S503, controlling the operation power of the heater to increase;

step S504, controlling the running power of the heater to increase, controlling the rotating speed of the water pump to increase, controlling the rotating speed of the cooling fan to increase, controlling the rotating speed of the hydrogen pump to increase, and controlling the rotating speed of the air compressor to increase;

step S505, adjusting the opening degree of a pressure relief valve and/or a backpressure valve;

step S506, judging whether the minimum output power of the galvanic pile is completely consumed;

if not, the above step S501 is repeatedly executed.

Specifically, when the fuel cell system enters an idle running working condition, the temperature of a refrigerant flowing into the electric pile is obtained. As shown in fig. 4, the higher the temperature of the refrigerant flowing into the cell stack, the higher the temperature of the cell stack, and the lower the maximum operation power of the heater.

When the temperature of the refrigerant flowing into the electric pile is lower than the preset temperature, the operation power of the heater is increased, the minimum output power of the electric pile can be consumed through the operation power of the heater, the net output power of the fuel cell system is reduced, and the stability of the output power of the fuel cell system under the idling operation condition is improved.

When the temperature of the refrigerant flowing into the stack is greater than or equal to a preset temperature, the maximum operating power of the heater is reduced, and thus the minimum output power of the stack cannot be completely consumed. At the moment, the operation power of the heater is controlled to be increased, the rotation speed of the water pump is controlled to be increased, the rotation speed of the cooling fan is controlled to be increased, the rotation speed of the hydrogen pump is controlled to be increased, and the rotation speed of the air compressor is controlled to be increased, so that the operation powers of the heater, the water pump, the cooling fan, the hydrogen pump and the air compressor are increased, the consumption effect on the minimum output power of the electric pile is improved, and the stability of the net output power of the fuel cell system under the idling operation condition is further improved.

In some examples, when the temperature of the coolant flowing into the stack is greater than or equal to a preset temperature, the radiator can exchange heat with the heater and the stack by adjusting the conduction state of the control valve, so that the temperature of the coolant flowing into the stack is reduced, the maximum operation power of the heater is increased, the minimum output power of the stack under the idle operation condition of the fuel cell system is further ensured to be consumed, and the operation reliability of the fuel cell system is improved.

In addition, the rotating speed of the water pump is controlled to be increased, so that the running power of the water pump can be increased, the flow of the coolant flowing into the radiator can be increased, the radiating effect of the radiator on the galvanic pile and the heater is further improved, the temperature of the coolant flowing into the galvanic pile is reduced, and the maximum running efficiency of the heater is improved.

It will be appreciated that increasing the speed of the air compressor increases both the air flow and the pressure at the outlet of the air compressor. As shown in fig. 10, point a is the correspondence between the flow rate at the outlet of the air compressor and the pressure value in the initial state of the air compressor. The rotation speed of the air compressor is increased, and if the opening degree of the back pressure valve is larger at the moment, the flow of the outlet of the air compressor is larger, the pressure is lower, and the operation point of the air compressor is changed to a point B. If the opening degree of the back pressure valve is smaller at this time, the flow rate of the outlet of the air compressor is smaller, and if the pressure is larger, the operating point of the air compressor is changed to the point C.

And adjusting the opening degree of the back pressure valve to change the operating point of the air compressor from the point B or the point C to the point D, and simultaneously adjusting the opening degree of the pressure release valve to change the operating point of the air compressor from the point D to the point E. As can be seen from the direction of power increase along the isopower line, the operating power increases as the air compressor changes from the initial operating point a to E.

In some examples, as shown in fig. 11, heater 130 is not included in fuel cell system 100.

As shown in fig. 12, the idle speed control method of the fuel cell system includes:

step S601, when the fuel cell system enters an idling operation condition, controlling the rotating speed of the water pump to increase, controlling the rotating speed of the cooling fan to increase, controlling the rotating speed of the hydrogen pump to increase, and controlling the rotating speed of the air compressor to increase;

step S602, judging whether the minimum output power of the galvanic pile is completely consumed;

if not, the above step S601 is repeatedly executed.

Specifically, when the fuel cell system does not include a heater, the minimum output power of the fuel cell stack can be reduced by increasing the rotation speed of the water pump, the rotation speed of the cooling fan, the rotation speed of the hydrogen pump and the rotation speed of the air compressor, so that the net output power of the fuel cell system is reduced, the stability of the net output power of the fuel cell system under the idle running working condition is improved, and meanwhile, the heater is not required to be arranged, so that the cost of the fuel cell system is reduced.

The description has been presented with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the description. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

While preferred embodiments of the present specification have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all changes and modifications that fall within the scope of the specification.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present specification without departing from the spirit and scope of the specification. Thus, if such modifications and variations of the present specification fall within the scope of the claims of the present specification and their equivalents, the specification is intended to include such modifications and variations.