Power control method for fuel cell system of mine truck

Abstract

The invention relates to the technical field of new energy special vehicles, and discloses a mine truck fuel cell system power control method, which comprises the following steps: obtaining total output power required to be output by a fuel cell total system according to the whole vehicle required power and the SOC of a power cell system; according to the state of each fuel cell subsystem in the fuel cell total system, obtaining the number of fuel cell subsystems capable of outputting power in the fuel cell total system; comparing the number of the fuel cell subsystems capable of outputting power with a set threshold value, and if the number is greater than the set threshold value, averagely distributing the total output power to the fuel cell subsystems capable of outputting power; if not, the total system output power of the fuel cell is zero, and the power cell system is closed; the demand power response speed is high, and the problems that the service life of an electric pile is shortened and attenuation is aggravated due to frequent power load changing of a fuel cell total system are effectively solved.

Description

Technical Field

[0001] The present application relates to the technical field of new energy special vehicles, and specifically to a power control method for a fuel cell system of a mining truck. Background Art

[0002] Fuel cells are devices that convert the chemical energy of fuel directly into electrical energy. They are highly efficient and pollution-free, and have great development potential and application prospects. Currently, the most mature and widely used fuel cell is the proton exchange membrane fuel cell, which converts chemical energy into electrical energy by generating water and electrons through electrochemical reactions between hydrogen and oxygen.

[0003] The fuel cell subsystem is suitable for commercial vehicle applications with high power and stable operating conditions. Therefore, mining trucks that run almost non-stop every day have become a good application platform for fuel cell subsystems. However, the mature and mass-produced fuel cell subsystems currently on the market cannot meet the traction power requirements of mining trucks with a single fuel cell subsystem, so it is necessary to use multiple fuel cell subsystems to form a stack to meet the power requirements of mining trucks.

[0004] However, the power response speed of using a single fuel cell system as the power system is slow, and frequent power changes will affect the service life of the fuel cell stack, causing the fuel cell stack to decay more severely.

[0005] Application Contents

[0006] The purpose of the present application is to provide a power control method for a mining truck fuel cell system that has a fast response speed to power demand and effectively avoids the problem of shortened service life of the fuel cell stack and increased attenuation caused by frequent power load changes in the total fuel cell system.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A power control method for a fuel cell system of a mining truck of the present invention comprises the following steps:

[0009] According to the required power of the whole vehicle and the SOC of the power battery system, the total output power required by the total fuel cell system is obtained;

[0010] According to the status of each fuel cell subsystem in the fuel cell system, determine whether the corresponding fuel cell subsystem can output power, and count to obtain the number of fuel cell subsystems in the fuel cell system that can output power;

[0011] The number of fuel cell subsystems that can output power of the total fuel cell system is compared with the set threshold. If the number of fuel cell subsystems that can output power is greater than the set threshold, the total output power that needs to be output by the total fuel cell system will be evenly distributed to the fuel cell subsystems that can output power; if the number of fuel cell subsystems that can output power is less than or equal to the set threshold, the output power of the total fuel cell system is zero, and the power battery system is shut down.

[0012] Furthermore, the method for obtaining the total output power required to be output by the total fuel cell system according to the required power of the whole vehicle and the SOC of the power battery system includes:

[0013] According to different SOC intervals of the power battery system, the output operating points of each output power of the total fuel cell system are set;

[0014] According to the power demand of the whole vehicle and the SOC range of the power battery system, the total output power required by the total fuel cell system is obtained;

[0015] The interval endpoint value of the SOC of the power battery system is used as the judgment condition for switching the output operating point of the fuel cell system, thereby controlling the load increase or decrease of the fuel cell system.

[0016] Furthermore, according to the power requirement of the whole vehicle and the SOC range of the power battery system, the method for obtaining the total output power required to be output by the total fuel cell system includes:

[0017] If the power demand of the whole vehicle is greater than the sum of the maximum power that the power battery system can output and the output power of the total fuel cell system at the output operating point corresponding to the SOC interval of the power battery system, the total output power that the total fuel cell system needs to output is the difference between the power demand of the whole vehicle and the maximum power that the power battery system can output;

[0018] If the power demand of the whole vehicle is less than the sum of the maximum power that the power battery system can output and the output operating point of the total fuel cell system corresponding to the SOC interval of the power battery system, then the output power of the total fuel cell system is the output operating point corresponding to the SOC interval of the power battery system.

[0019] Furthermore, if the power demand of the entire vehicle is less than the output operating point of the total fuel cell system in the range where the SOC of the power battery system is located, the difference between the output operating point of the total fuel cell system in the range where the SOC of the power battery system is located and the power demand of the entire vehicle is used to charge the power battery system.

[0020] Further, according to the state of each fuel cell subsystem in the fuel cell system, whether the corresponding fuel cell subsystem can output power is determined, and the number of fuel cell subsystems that can output power in the fuel cell system is counted to obtain the method of:

[0021] According to the status of each fuel cell subsystem in the total fuel cell system, the corresponding fuel cell subsystem is assigned a value, and the assigned values ​​of all fuel cell subsystems are summed to calculate the number of fuel cell subsystems that can output power in the total fuel cell system.

[0022] Compared with the prior art, the beneficial effects of this application are:

[0023] The present application adopts lithium batteries as the power battery system, and combines the fuel cell system to form a dual power source to respond to the power demand of the whole vehicle, effectively solving the problem of slow power response speed of the fuel cell system as a power source alone and the aggravated attenuation of the life of the stack caused by frequent load changes; the power battery system is used as the main power source to effectively protect the fuel cell system, and the total output power required to be output by the fuel cell system is evenly distributed to each set of fuel cell subsystems that can output power, thereby ensuring that the service life and performance attenuation of multiple fuel cell subsystems are basically the same; the present application can flexibly combine single fuel cell subsystems with different rated power to meet the power requirements of high-power mining trucks with different traction power, covering all power ranges, and there is no need to worry about insufficient output power of the power battery system, because the output power of the fuel cell system is controlled according to the SOC of the power battery system, and the insufficient power can be provided by the fuel cell system; and in actual applications, according to the specific situation, it is judged that the power demand of the whole vehicle cannot be met after several sets of fuel cell subsystems in the fuel cell system fail to shut down, and the power source is controlled to perform the shutdown process or average distribution; the present application has a fast response speed to the required power, and effectively avoids the problem of shortened service life and aggravated attenuation of the stack caused by frequent power load changes of the fuel cell system. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the implementation methods of the present application, the drawings required for use in the implementation methods will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 It is a flow chart of the method of this application. DETAILED DESCRIPTION

[0026] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0027] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show the layers related to the present invention rather than being drawn according to the number, shape and size of the layers in actual implementation. In actual implementation, the type, quantity and proportion of each layer may be changed arbitrarily, and the layer layout may also be more complicated.

[0028] In the following description, numerous details are discussed to provide a more thorough explanation of embodiments of the present invention; however, it is apparent to one skilled in the art that embodiments of the present invention may be practiced without these specific details.

[0029] See also Figure 1 , a power control method for a fuel cell system of a mining truck, comprising the following steps:

[0030] According to the required power of the whole vehicle and the SOC of the power battery system, the total output power required by the total fuel cell system is obtained;

[0031] According to the status of each fuel cell subsystem in the fuel cell system, determine whether the corresponding fuel cell subsystem can output power, and count to obtain the number of fuel cell subsystems in the fuel cell system that can output power;

[0032] The number of fuel cell subsystems that can output power of the total fuel cell system is compared with the set threshold. If the number of fuel cell subsystems that can output power is greater than the set threshold, the total output power that needs to be output by the total fuel cell system will be evenly distributed to the fuel cell subsystems that can output power; if the number of fuel cell subsystems that can output power is less than or equal to the set threshold, the output power of the total fuel cell system is zero, and the power battery system is shut down.

[0033] The present application adopts lithium batteries as the power battery system, and combines the fuel cell system to form a dual power source to respond to the power demand of the whole vehicle, effectively solving the problem of slow power response speed of the fuel cell system as a power source alone and the aggravated attenuation of the life of the stack caused by frequent load changes; the power battery system is used as the main power source to effectively protect the fuel cell system, and the total output power required to be output by the fuel cell system is evenly distributed to each set of fuel cell subsystems that can output power, thereby ensuring that the service life and performance attenuation of multiple fuel cell subsystems are basically the same; the present application can flexibly combine single fuel cell subsystems with different rated power to meet the power requirements of high-power mining trucks with different traction power, covering all power ranges, and there is no need to worry about insufficient output power of the power battery system, because the output power of the fuel cell system is controlled according to the SOC of the power battery system, and the insufficient power can be provided by the fuel cell system; and in actual applications, according to the specific situation, it is judged that the power demand of the whole vehicle cannot be met after several sets of fuel cell subsystems in the fuel cell system fail to shut down, and the power source is controlled to perform the shutdown process or average distribution; the present application has a fast response speed to the required power, and effectively avoids the problem of shortened service life and aggravated attenuation of the stack caused by frequent power load changes of the fuel cell system.

[0034] The method for obtaining the total output power required to be output by the total fuel cell system according to the vehicle required power and the SOC of the power battery system includes:

[0035] According to different SOC intervals of the power battery system, the output operating points of each output power of the total fuel cell system are set;

[0036] According to the power demand of the whole vehicle and the SOC range of the power battery system, the total output power required by the total fuel cell system is obtained;

[0037] The interval endpoint value of the SOC of the power battery system is used as the judgment condition for switching the output operating point of the fuel cell system, thereby controlling the load increase or decrease of the fuel cell system.

[0038] According to the power requirement of the whole vehicle and the SOC range of the power battery system, the method of obtaining the total output power required by the total fuel cell system includes:

[0039] If the power demand of the whole vehicle is greater than the sum of the maximum power that the power battery system can output and the output power of the total fuel cell system at the output operating point corresponding to the SOC interval of the power battery system, the total output power that the total fuel cell system needs to output is the difference between the power demand of the whole vehicle and the maximum power that the power battery system can output;

[0040] If the power demand of the whole vehicle is less than the sum of the maximum power that the power battery system can output and the output operating point of the total fuel cell system corresponding to the SOC interval of the power battery system, then the output power of the total fuel cell system is the output operating point corresponding to the SOC interval of the power battery system.

[0041] If the power demand of the whole vehicle is less than the output operating point of the total fuel cell system in the range where the SOC of the power battery system is located, the difference between the output operating point of the total fuel cell system in the range where the SOC of the power battery system is located and the power demand of the whole vehicle is used to charge the power battery system.

[0042] The output operating points of each output power of the total fuel cell system are set according to different SOC intervals of the power battery system, for example:

[0043] The SOC of the power battery system is in the range of [40, 50), and the corresponding output operating point of the total fuel cell system is 60Kw;

[0044] The SOC of the power battery system is in the range of [30, 40), and the corresponding output operating point of the total fuel cell system is 70Kw;

[0045] The SOC of the power battery system is in the range of [20, 30), and the corresponding output operating point of the total fuel cell system is 80Kw;

[0046] The SOC of the power battery system is in the range of [10, 20), and the corresponding output operating point of the total fuel cell system is 90Kw;

[0047] The SOC of the power battery system is in the range of [0, 10), and the corresponding output operating point of the fuel cell system is 100Kw;

[0048] The maximum output power of the power battery system is 100Kw;

[0049] If the vehicle power requirement is 190Kw, and the SOC of the power battery system is in the range of [40, 50), the vehicle power requirement is greater than the sum of the maximum power that the power battery system can output and the output power of the total fuel cell system at the output operating point corresponding to the SOC range of the power battery system, which is 160Kw. Then the total output power of the total fuel cell system is the difference between the vehicle power requirement and the maximum power that the power battery system can output, which is 90Kw.

[0050] If the vehicle power requirement is 110Kw, and the SOC of the power battery system is in the interval [40, 50), the vehicle power requirement is less than the sum of the maximum power that the power battery system can output and the output power of the total fuel cell system at the output operating point corresponding to the SOC interval of the power battery system, which is 160Kw. Then the output power of the total fuel cell system is the output operating point corresponding to the SOC interval of the power battery system, which is 60Kw.

[0051] If the vehicle power requirement is 50Kw, the SOC of the power battery system is in the range of [40, 50), and the vehicle power requirement is less than the output power of the total fuel cell system at the output operating point corresponding to the SOC range of the power battery system, then the total output power of the total fuel cell system needs to be 60Kw, and 10Kw greater than the vehicle power requirement is used to charge the power battery system. And when the SOC of the power battery system gradually increases, the output power of the total fuel cell system gradually decreases until it reaches zero.

[0052] According to the state of each fuel cell subsystem in the fuel cell system, a method for determining whether the corresponding fuel cell subsystem can output power and counting the number of fuel cell subsystems that can output power in the fuel cell system includes:

[0053] According to the status of each fuel cell subsystem in the total fuel cell system, the corresponding fuel cell subsystem is assigned a value, and the assigned values ​​of all fuel cell subsystems are summed to calculate the number of fuel cell subsystems that can output power in the total fuel cell system.

[0054] The states of the fuel cell subsystem include self-test, startup, operation, shutdown, and failure. When the fuel cell subsystem is in a state where it can output power, that is, in an operating state, a value of 1 is assigned to the corresponding fuel cell subsystem. When the fuel cell subsystem is in a state where it cannot output power, a value of 0 is assigned to the corresponding fuel cell subsystem. The values ​​assigned to all fuel cell subsystems are summed to calculate the number M of fuel cell subsystems that can output power in the total fuel cell system. There are a total of N fuel cell subsystems in the total fuel cell system, and 0≤M≤N.

[0055] In actual applications, if the fuel cell subsystem fails and shuts down X units, the power demand of the whole vehicle cannot be met. The threshold is set as the calibration quantity NX, X>0; when the number of fuel cell subsystems that can output power in the total fuel cell system is M≤(NX), the total fuel cell system cannot meet the power demand of the whole vehicle, the output power of the total fuel cell system is zero, and the power battery system is shut down; when M>(NX), the total output power required by the total fuel cell system is evenly distributed to the output of the fuel cell subsystems that can output power. Ensure that the use time and performance degradation of multiple fuel cell subsystems are basically consistent.

[0056] In the above-mentioned embodiments, although the present invention has been described in conjunction with the specific embodiments of the present invention, many replacements, modifications and variations of these embodiments will be apparent to those of ordinary skill in the art based on the foregoing description. The embodiments of the present invention are intended to cover all such replacements, modifications and variations falling within the broad scope of the appended claims.

[0057] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A power control method for a fuel cell system of a mining truck, characterized in that: The following steps are involved: According to the required power of the whole vehicle and the SOC of the power battery system, the total output power required by the total fuel cell system is obtained; According to the status of each fuel cell subsystem in the fuel cell system, determine whether the corresponding fuel cell subsystem can output power, and count to obtain the number of fuel cell subsystems in the fuel cell system that can output power; The number of fuel cell subsystems that can output power of the total fuel cell system is compared with the set threshold. If the number of fuel cell subsystems that can output power is greater than the set threshold, the total output power that needs to be output by the total fuel cell system will be evenly distributed to the fuel cell subsystems that can output power; if the number of fuel cell subsystems that can output power is less than or equal to the set threshold, the output power of the total fuel cell system is zero, and the power battery system is shut down.

2. A method for controlling the power of a fuel cell system of a mining truck according to claim 1, characterized in that: The method for obtaining the total output power required to be output by the total fuel cell system according to the required power of the whole vehicle and the SOC of the power battery system includes: According to different intervals of the SOC of the power battery system, the output operating points of each output power of the total fuel cell system are set; According to the power demand of the whole vehicle and the SOC range of the power battery system, the total output power required by the total fuel cell system is obtained; The interval endpoint value of the SOC of the power battery system is used as the judgment condition for switching the output operating point of the fuel cell system, thereby controlling the load increase or decrease of the fuel cell system.

3. A method for controlling the power of a fuel cell system of a mining truck according to claim 2, characterized in that: According to the power requirement of the whole vehicle and the SOC range of the power battery system, the method of obtaining the total output power required by the total fuel cell system includes: If the power demand of the whole vehicle is greater than the sum of the maximum power that the power battery system can output and the output power of the total fuel cell system at the output operating point corresponding to the SOC interval of the power battery system, the total output power that the total fuel cell system needs to output is the difference between the power demand of the whole vehicle and the maximum power that the power battery system can output; If the power demand of the whole vehicle is less than the sum of the maximum power that the power battery system can output and the output operating point of the total fuel cell system corresponding to the SOC interval of the power battery system, then the output power of the total fuel cell system is the output operating point corresponding to the SOC interval of the power battery system.

4. A method for controlling the power of a fuel cell system of a mining truck according to claim 3, characterized in that: If the power demand of the whole vehicle is less than the output operating point of the total fuel cell system at the output operating point corresponding to the SOC interval of the power battery system, the difference between the output operating point of the total fuel cell system at the output operating point corresponding to the SOC interval of the power battery system and the power demand of the whole vehicle is used to charge the power battery system.

5. The power control method of a mining truck fuel cell system according to claim 1, characterized in that: According to the state of each fuel cell subsystem in the fuel cell system, a method for determining whether the corresponding fuel cell subsystem can output power and counting the number of fuel cell subsystems that can output power in the fuel cell system includes: According to the status of each fuel cell subsystem in the total fuel cell system, the corresponding fuel cell subsystem is assigned a value, and the assigned values ​​of all fuel cell subsystems are summed to calculate the number of fuel cell subsystems that can output power in the total fuel cell system.

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