A control method and device for an air compressor, a medium and a fuel cell system

Abstract

The application discloses a kind of control method, device, medium and fuel cell system of air compressor, fuel cell system includes air compressor;The control method of air compressor includes: determining the operating state of air compressor;If air compressor is in pre-start state, then determine the starting current of air compressor according to pre-start state, starting current is not greater than the rated current of air compressor;Output starting current to air compressor to control air compressor start.The technical scheme of the present application, when air compressor is in pre-start state, the starting current not greater than the rated current of air compressor controls the start of air compressor, can reduce the power consumption generated in the starting process of air compressor.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air compressors, and in particular to an air compressor control method, device, medium and fuel cell system. BACKGROUND

[0002] In recent years, under the dual pressures of energy crisis and environmental protection, fuel cell technology has developed rapidly due to the demand for efficient and clean energy. Fuel cell technology has the advantages of fuel diversification, clean emissions, low noise, less environmental pollution, good reliability and maintainability. The new energy fuel cell system plays a vital role in the field of fuel cell electric vehicles, mainly composed of a fuel supply system, an air supply system, a reaction stack, a thermal management system, an electronic control system and a data acquisition system. The air supply system provides clean air with appropriate flow rate, temperature, pressure and humidity for the stack, mainly including air filters, air compressors, intercoolers, humidifiers and throttle valves. Among them, the air compressor is known as the "lungs" of the fuel cell, and its performance directly affects the important performance indicators of the entire fuel cell system, such as compression ratio, efficiency and noise.

[0003] In existing fuel cell systems, the starting current of the air compressor is 5-7 times the rated current, which brings a large power consumption. Therefore, how to reduce the power consumption generated during the starting process of the air compressor has become a problem to be solved. SUMMARY

[0004] The present application provides an air compressor control method, device, medium and fuel cell system to reduce the power consumption generated during the starting process of the air compressor.

[0005] In a first aspect, the present application provides an air compressor control method applied to a fuel cell system, wherein the fuel cell system comprises a controller and an air compressor, and the controller is electrically connected to the air compressor; the air compressor control method comprises the following steps:

[0006] determining the operating state of the air compressor;

[0007] if the air compressor is in a pre-starting state, determining the starting current of the air compressor according to the pre-starting state, wherein the starting current is not greater than the rated current of the air compressor;

[0008] outputting the starting current to the air compressor to control the starting of the air compressor.

[0009] Optionally, the fuel cell system further comprises an inverter, and the inverter is electrically connected to the controller and the air compressor, respectively;

[0010] After determining the operating state of the air compressor, the method further comprises the following steps:

[0011] If the air compressor is in an idle running state, a control frequency of the inverter is determined as a first control frequency according to the idle running state, and the inverter is controlled to run according to the first control frequency.

[0012] If the air compressor is in a full load running state, a control frequency of the inverter is determined as a second control frequency according to the full load running state, and the inverter is controlled to run according to the second control frequency; wherein the first control frequency is less than the second control frequency.

[0013] Optionally, the method further comprises:

[0014] acquiring speed information of the air compressor and state information of a vehicle ignition coil;

[0015] determining state information of the air compressor according to the speed information and the state information of the vehicle ignition coil.

[0016] Optionally, the determining the state information of the air compressor according to the speed information and the state information of the vehicle ignition coil comprises:

[0017] if the speed information is less than a rated minimum speed of the air compressor and the vehicle ignition coil is in a closed state, determining that the air compressor is in a pre-starting state.

[0018] Optionally, after the determining the running state of the air compressor, the method further comprises:

[0019] if the air compressor is in a post-starting running state, determining a running current of the air compressor according to the post-starting running state, the running current being greater than a rated current of the air compressor;

[0020] outputting the running current to the air compressor to control the air compressor to run.

[0021] Optionally, a ratio a between the starting current and the rated current satisfies 0.8≤a≤1.

[0022] Optionally, a ratio b between the first control frequency and the second control frequency satisfies b=0.5.

[0023] In a second aspect, the present application provides a control device of an air compressor, applied to a fuel cell system, the fuel cell system comprising a controller and an air compressor, the controller being electrically connected with the air compressor; the control device of the air compressor comprising:

[0024] a running state determining module, configured to determine a running state of the air compressor;

[0025] The starting current determination module is configured to determine the starting current of the air compressor according to the pre-starting state when the air compressor is in the pre-starting state, and the starting current is not greater than the rated current of the air compressor.

[0026] The output module is configured to output the starting current to the air compressor to control starting of the air compressor.

[0027] In a third aspect, the present application provides a controller configured to perform the method for controlling the air compressor according to the first aspect.

[0028] In a fourth aspect, the present application provides a computer readable storage medium storing computer instructions configured to cause a processor to perform the method for controlling the air compressor according to the first aspect when executed.

[0029] The method for controlling the air compressor provided by the present application determines the running state of the air compressor, and determines the starting current of the air compressor according to the pre-starting state when the air compressor is in the pre-starting state, and the starting current is not greater than the rated current of the air compressor. The starting current is output to the air compressor to control starting of the air compressor. The technical solution of the present application can reduce the power consumption of the air compressor during starting by controlling starting of the air compressor by the starting current not greater than the rated current of the air compressor when the air compressor is in the pre-starting state. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 A flow chart of the method for controlling the air compressor provided by the embodiment of the present application is shown in the figure.

[0031] Figure 2 A flow chart of another method for controlling the air compressor provided by the embodiment of the present application is shown in the figure.

[0032] Figure 3 A flow chart of still another method for controlling the air compressor provided by the embodiment of the present application is shown in the figure.

[0033] Figure 4 A flow chart of yet another method for controlling the air compressor provided by the embodiment of the present application is shown in the figure.

[0034] Figure 5 A structure schematic diagram of the control device of the air compressor provided by the embodiment of the present application is shown in the figure. DETAILED DESCRIPTION

[0035] The present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application. In addition, it should be noted that only the parts related to the present application are shown in the drawings for the convenience of description.

[0036] Figure 1 A flow chart of a control method of an air compressor is provided for an embodiment of the present application. The method is applied to a fuel cell system, and the fuel cell system comprises an air compressor. The method can be applied to control the operation of the air compressor. The method can be executed by an air compressor control device provided by an embodiment of the present application, and the air compressor control device is implemented in the form of hardware and / or software. As shown in the figure, the control method of the air compressor comprises: Figure 1

[0037] S101, determining the operation state of the air compressor.

[0038] The air compressor is used to provide necessary air or oxygen for the fuel cell system, and the air compressor can be a screw air compressor, a Roots air compressor or a centrifugal air compressor, etc. The embodiment of the present application does not make specific limitation on this. The operation state of the air compressor can include a pre-start state, an idle operation state and a post-start operation state, etc.

[0039] Specifically, the current operation state of the air compressor can be determined according to the rotational speed of the air compressor, etc. For example, if the rotational speed of the air compressor is zero, it is determined that the operation state of the air compressor is the pre-start state. If the rotational speed of the air compressor is the rated minimum rotational speed, it is determined that the operation state of the air compressor is the idle operation state. If the rotational speed of the air compressor is greater than the rated minimum rotational speed, it is determined that the operation state of the air compressor is the post-start operation state.

[0040] S102, if the air compressor is in the pre-start state, determining the starting current of the air compressor according to the pre-start state, and the starting current is not greater than the rated current of the air compressor.

[0041] The rated current is the current of the air compressor working at the rated voltage. Optionally, the ratio a between the starting current and the rated current satisfies 0.8≤a≤1. The ratio a between the starting current and the rated current is related to the load information of the air compressor, etc. and can be set according to actual needs, without exceeding the range of 0.8≤a≤1, the embodiment of the present application does not make specific limitation on this.

[0042] Specifically, when it is determined by S101 that the air compressor is in the pre-start state, the starting current not greater than the rated current of the air compressor is determined according to the load information in the pre-start state. In this way, the starting of the air compressor is controlled by the starting current not greater than the rated current of the air compressor, that is, the starting of the air compressor is controlled by the driving current less than or equal to the rated current of the air compressor, which can reduce the power consumption generated by the air compressor during the starting process.

[0043] S103, outputting the starting current to the air compressor to control the starting of the air compressor.

[0044] Specifically, the starting current of the air compressor is determined by S102 and outputted to the air compressor, so that the air compressor starts according to the determined starting current.​

[0045] The control method of the air compressor provided by the embodiment of the present application determines the running state of the air compressor, and if the air compressor is in a pre-start state, determines the starting current of the air compressor according to the pre-start state, the starting current being not greater than the rated current of the air compressor; and outputs the starting current to the air compressor to control the starting of the air compressor. The technical solution of the embodiment of the present application can reduce the power consumption of the air compressor during the starting process by controlling the starting of the air compressor by the starting current not greater than the rated current of the air compressor when the air compressor is in the pre-start state.

[0046] Optionally, Figure 2 The flow chart of another control method of the air compressor provided by the embodiment of the present application is applied to a fuel cell system, the fuel cell system comprising an air compressor, and the fuel cell system further comprising an inverter, the inverter being electrically connected with the air compressor. As shown in Figure 2 The control method of the air compressor comprises the following steps:

[0047] S201, determining the running state of the air compressor.

[0048] S202, if the air compressor is in a pre-start state, determining the starting current of the air compressor according to the pre-start state, the starting current being not greater than the rated current of the air compressor.

[0049] S203, outputting the starting current to the air compressor to control the starting of the air compressor.

[0050] S204, if the air compressor is in an idle running state, determining the control frequency of the inverter as a first control frequency according to the idle running state and controlling the inverter to run according to the first control frequency.

[0051] Specifically, the output power of the air compressor is related to the rotating speed of the air compressor, the higher the rotating speed of the air compressor, the greater the output power, and vice versa. The rotating speed of the air compressor is related to the control frequency of the inverter, that is, the greater the control frequency of the inverter, the greater the rotating speed of the air compressor, and vice versa. When it is determined by S201 that the air compressor is in the idle running state, it indicates that the air compressor does not need to output a large power at this time, and at this time, the control frequency of the inverter is determined as the first control frequency and the inverter is controlled to run according to the first control frequency, so that the air compressor outputs a lower power under the control of the inverter, thereby reducing the power consumption in the idle running state.

[0052] S205, if the air compressor is in a full-load running state, determining the control frequency of the inverter as a second control frequency according to the full-load running state and controlling the inverter to run according to the second control frequency.

[0053] Specifically, when it is determined in S201 that the air compressor is in the full load operation state, it indicates that the air compressor needs to output a larger power at this time to output the air or oxygen required for full load operation, and at this time, the control frequency of the inverter is determined as the second control frequency and the inverter is controlled to operate according to the second control frequency. In this way, the air compressor can output a larger power under the control of the inverter, so that the air compressor can stably output the power required for full load operation.

[0054] It can be understood that the second control frequency can be the rated frequency of the air compressor or can be set according to actual needs, and the embodiments of the present application do not make specific limitations thereto.

[0055] The first control frequency is less than the second control frequency. The greater the control frequency of the inverter, the more the switching devices included in the inverter turn on and off per second, and the greater the turn-on and turn-off loss generated. By controlling the first control frequency of the inverter to be less than the second control frequency, the inverter generates a smaller power consumption in the idling operation state. Optionally, the ratio b between the first control frequency and the second control frequency satisfies b=0.5.

[0056] The control method of the air compressor provided by the embodiments of the present application sets the control frequency of the inverter as the first control frequency when the air compressor is in the idling operation state, and sets the control frequency of the inverter as the second control frequency when the air compressor is in the full load operation state, and the first control frequency is less than the second control frequency. In this way, the air compressor can output a larger power in the full load operation state, and the air compressor outputs a smaller power in the idling operation state, thereby reducing the power consumption of the air compressor and the inverter.

[0057] Optionally, Figure 3 A flowchart of another control method of an air compressor provided by the embodiments of the present application is provided, which is applicable to the case of determining the operation state of the air compressor. As shown in Figure 3 The control method of the air compressor comprises:

[0058] S301, acquiring the speed information of the air compressor and the state information of the vehicle ignition coil.

[0059] The speed information of the air compressor includes the current speed of the air compressor, and the state information of the vehicle ignition coil includes the closed state or the open state of the ignition coil.

[0060] Specifically, the current speed of the air compressor can be measured by setting a speed measuring device such as a position sensor inside the air compressor, and the closed state or the open state of the ignition coil can be measured by a voltage sensor or a current sensor, so as to subsequently determine the state information of the air compressor according to the speed information of the air compressor and the state information of the vehicle ignition coil.

[0061] S302, determining the state information of the air compressor according to the speed information and the state information of the vehicle ignition coil.

[0062] Specifically, the air compressor has a corresponding rated minimum speed and a rated maximum speed. For example, the rated minimum speed of the air compressor is 30000r / min, and the rated maximum speed is 120000r / min. If the speed information of the air compressor is equal to the rated minimum speed of the air compressor, it is determined that the air compressor is in an idle running state. If the speed information of the air compressor is greater than the rated minimum speed of the air compressor and less than the rated maximum speed of the air compressor, it is determined that the air compressor is in a post-start running state. If the speed information of the air compressor is equal to the rated maximum speed of the air compressor, it is determined that the air compressor is in a full-load running state.

[0063] Optionally, the state information of the air compressor is determined according to the speed information and the state information of the vehicle ignition coil, including: if the speed information is less than the rated minimum speed of the air compressor and the vehicle ignition coil is in a closed state, the air compressor is determined to be in a pre-start state.

[0064] For example, the current speed in the speed information of the air compressor is 0r / min, which is less than the rated minimum speed of 30000r / min, and the vehicle ignition coil is in a closed state, indicating that the air compressor is in a pre-start state before starting.

[0065] S303, if the air compressor is in a pre-start state, the starting current of the air compressor is determined according to the pre-start state, and the starting current is not greater than the rated current of the air compressor.

[0066] S304, output the starting current to the air compressor to control the starting of the air compressor.

[0067] The technical scheme of the embodiment of the application, by obtaining the speed information of the air compressor and the state information of the vehicle ignition coil, determines the state information of the air compressor according to the speed information and the state information of the vehicle ignition coil, so as to subsequently control the starting current and other parameters of the air compressor according to the state information of the air compressor, and reduce the power consumption of the air compressor.

[0068] Optionally, Figure 4 Another flowchart of a control method of an air compressor is provided for the embodiment of the application, which is applicable to the case after determining the running state of the air compressor. As shown in the figure, Figure 4 The control method of the air compressor comprises:

[0069] S401, the running state of the air compressor is determined.

[0070] S402, if the air compressor is in a pre-start state, the starting current of the air compressor is determined according to the pre-start state, and the starting current is not greater than the rated current of the air compressor.

[0071] S403, output the starting current to the air compressor to control the starting of the air compressor.

[0072] S404, if the air compressor is in a post-startup running state, determining a running current of the air compressor according to the post-startup running state, the running current being greater than a rated current of the air compressor.

[0073] Specifically, if the air compressor is in the post-startup running state, the air compressor outputs a larger power through the running current greater than the rated current of the air compressor, so that the fuel cell system reliably runs. For example, the running current can be 5-7 times of the rated current, which can be set according to actual needs, and the embodiment of the present application does not make specific limitation thereto.

[0074] S405, outputting the running current to the air compressor to control the air compressor to run.

[0075] Specifically, the running current of the air compressor is determined by S404 and outputted to the air compressor, so that the air compressor runs according to the determined running current.

[0076] The technical solution provided by the embodiment of the present application is that if the air compressor is in the post-startup running state, the running current of the air compressor is determined according to the post-startup running state, the running current is greater than the rated current of the air compressor, the air compressor is controlled to run at the running current, and the air compressor outputs a larger power, so that the fuel cell system reliably runs.

[0077] Figure 5 A structural schematic diagram of a control device of an air compressor provided by the embodiment of the present application is shown in Figure 5 The control device of the air compressor includes:

[0078] A running state determination module 10 for determining a running state of the air compressor;

[0079] A startup current determination module 20 for determining a startup current of the air compressor according to the pre-startup state if the air compressor is in the pre-startup state, the startup current being not greater than the rated current of the air compressor;

[0080] A startup current output module 30 for outputting the startup current to the air compressor to control the air compressor to start.

[0081] The control device of the air compressor provided by the embodiment of the present application can execute the control method of the air compressor provided by any embodiment of the present application, has the function modules and beneficial effects corresponding to the execution method, and the same parts can be referred to the description above.

[0082] The embodiment of the present application provides a fuel cell system including a controller and an air compressor, the controller being electrically connected with the air compressor and being used for executing the control method of the air compressor provided by any embodiment of the present application, having the same beneficial effects as the method, which will not be described herein.

[0083] Based on the same inventive concept, the embodiment of the present application also provides a computer readable storage medium, which stores computer instructions for causing a processor to execute a control method of an air compressor as any embodiment of the present application, having the same beneficial effects as the method, which will not be described here.

[0084] It should be noted that the above only describes the preferred embodiments of the present application and the technical principles applied. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and those skilled in the art can make various obvious changes, re-adjustments, mutual combinations and substitutions without departing from the scope of the present application. Therefore, although the present application has been described in more detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.

Claims

1. A control method of an air compressor applied to a fuel cell system including an air compressor, characterized by, The control method of the air compressor comprises: determining the running state of the air compressor; if the air compressor is in a pre-starting state, determining the starting current of the air compressor according to the pre-starting state, the starting current being not greater than the rated current of the air compressor; outputting the starting current to the air compressor to control starting of the air compressor; wherein determining the running state of the air compressor comprises: obtaining the speed information of the air compressor and the state information of the vehicle ignition coil; the speed information of the air compressor comprises the current speed of the air compressor, and the state information of the vehicle ignition coil comprises the closed state or the disconnected state of the vehicle ignition coil; determining the state information of the air compressor according to the speed information and the state information of the vehicle ignition coil; determining the state information of the air compressor according to the speed information and the state information of the vehicle ignition coil comprises: if the current speed in the speed information is less than the rated minimum speed of the air compressor and the vehicle ignition coil is in the closed state, determining that the air compressor is in the pre-starting state; after determining the running state of the air compressor, further comprising: if the air compressor is in a post-starting running state, determining the running current of the air compressor according to the post-starting running state, the running current being greater than the rated current of the air compressor; outputting the running current to the air compressor to control running of the air compressor.

2. The control method according to claim 1, characterized by, The fuel cell system further comprises an inverter, the inverter being electrically connected with the air compressor; after determining the running state of the air compressor, further comprising: if the air compressor is in an idle running state, determining the control frequency of the inverter to be a first control frequency according to the idle running state and controlling the inverter to run according to the first control frequency; if the air compressor is in a full-load running state, determining the control frequency of the inverter to be a second control frequency according to the full-load running state and controlling the inverter to run according to the second control frequency; wherein the first control frequency is less than the second control frequency.

3. The control method according to claim 1, characterized by, The ratio a between the starting current and the rated current satisfies 0.8≤a≤1.

4. The control method according to claim 2, characterized by, The ratio b between the first control frequency and the second control frequency satisfies b=0.

5.

5. A control device of an air compressor, characterized by comprising: The control method of the air compressor is used to implement any one of claims 1-4. The control device of the air compressor comprises: a running state determining module, configured to determine the running state of the air compressor; wherein determining the running state of the air compressor comprises: obtaining the speed information of the air compressor and the state information of the vehicle ignition coil, and determining the state information of the air compressor according to the speed information and the state information of the vehicle ignition coil; a starting current determining module, configured to, if the air compressor is in a pre-starting state, determine the starting current of the air compressor according to the pre-starting state, the starting current being not greater than the rated current of the air compressor; a starting current output module, configured to output the starting current to the air compressor to control starting of the air compressor.

6. A fuel cell system characterized by comprising: The air compressor comprises a controller and an air compressor, the controller is electrically connected with the air compressor; the controller is used for executing the control method of the air compressor as claimed in any one of claims 1-4.

7. A computer-readable storage medium, characterized in that, The computer readable storage medium stores computer instructions, and the computer instructions are used for enabling the processor to implement the control method of the air compressor as claimed in any one of claims 1-4 when executed.

Images