KR20230158307A - Method and system for multiple fuel cell of fuel cell vehicle - Google Patents

Abstract

Step of increasing the power generation output of a plurality of fuel cells based on the charge amount of the high-voltage battery in the controller, and in a state where the power generation output of the plurality of fuel cells is increased in the controller, each fuel cell is based on the output voltage compared to the current consumption of each fuel cell. A method of controlling a plurality of fuel cells for a fuel cell vehicle, including deriving a deterioration rate of the battery and differentially controlling the power generation output of each fuel cell during the next driving of the fuel cell vehicle according to the deterioration rate derived from the controller; The control system is introduced.

Description

Control method and control system for multiple fuel cells of a fuel cell vehicle {METHOD AND SYSTEM FOR MULTIPLE FUEL CELL OF FUEL CELL VEHICLE}

The present invention relates to a method and control system for controlling a plurality of fuel cells of a fuel cell vehicle, and specifically, to a fuel cell vehicle capable of differentially controlling the power generation output of each fuel cell according to the difference in the deterioration rate of each of the plurality of fuel cells. It relates to a plurality of fuel cell control method and control system.

A fuel cell is a device that receives hydrogen and air from the outside and generates electrical energy through an electrochemical reaction inside the fuel cell stack. It is used to drive motors in eco-friendly vehicles such as fuel cell electric vehicles (FCEV). Can be used as a power source.

The fuel cell system mounted on a fuel cell vehicle consists of a fuel cell stack that stacks a plurality of fuel cell cells used as a power source, a fuel supply system that supplies hydrogen as a fuel to the fuel cell stack, and oxygen as an oxidizing agent necessary for electrochemical reactions. It includes an air supply system that supplies energy, a heat management system that uses coolant to control the temperature of the fuel cell stack, etc.

Specifically, in a polymer electrolyte membrane fuel cell (PEMFC) with high power density, the main component, the membrane-electrode assembly (MEA), is located at the innermost part, and the membrane-electrode assembly contains hydrogen ions. It consists of a solid polymer electrolyte membrane that can move the electrolyte membrane, and a cathode (air electrode) and anode (anode), which are electrode layers coated with a catalyst to allow hydrogen and oxygen to react on both sides of the electrolyte membrane.

Meanwhile, like a general high-voltage battery, the internal components of a fuel cell deteriorate as it is used for a long time. If fuel cell deterioration occurs, the generated voltage value compared to the same current or the generated output value compared to the same current decreases, which may cause output instability and system shutdown due to voltage drop in the maximum output section.

Accordingly, the lifespan of the fuel cell is limited, and the problem of fuel cell deterioration is one of the most important factors to be considered in the manufacture of fuel cell vehicles.

Currently, various degradation diagnosis systems and methods are being applied to diagnose the degree of deterioration of fuel cells, and detailed information regarding this is disclosed in Patent Document 1 (KR 10-2012-0136819 A).

Meanwhile, among commercial fuel cell vehicles currently being mass-produced, vehicles that require high output (for example, city buses, trucks, express buses, etc.) are equipped with multiple fuel cells (two or more).

In such commercial fuel cell vehicles, if one or more of the plurality of fuel cells deteriorates to the point where replacement is necessary, the entire fuel cell must be replaced, so it is necessary to similarly adjust the deterioration rate of each fuel cell.

Accordingly, conventionally, equal control has been performed to equally control the power generation output of each fuel cell. However, even if power generation is controlled equally, the degree of deterioration of each fuel cell is bound to differ due to reasons such as differences in the load of each fuel cell, manufacturing variation of the cells inside the fuel cell stack, and variation in materials used.

Despite the difference in the degree of deterioration of each fuel cell, if uniform control is continuously performed, the amount of current drawn from the fuel cell with a relatively severe degree of deterioration continues to increase, further accelerating the deterioration.

Therefore, there is an urgent need to provide technology that can determine the difference in the deterioration rate of each fuel cell and manage the rate of deterioration equally.

The matters described as background technology above are only for the purpose of improving understanding of the background of the present invention, and should not be taken as acknowledgment that they correspond to prior art already known to those skilled in the art.

KR 10-2012-0136819 A

The present invention was proposed to solve this problem. The deterioration rate of each fuel cell is derived based on the output voltage compared to the current consumption of a plurality of fuel cells, and the power generation output of each fuel cell is calculated according to the derived deterioration rate. The object of the present invention is to provide a method and control system for controlling multiple fuel cells of a fuel cell vehicle that can equally manage the rate of deterioration of multiple fuel cells by differentially controlling them.

A method of controlling a plurality of fuel cells of a fuel cell vehicle according to the present invention to achieve the above object includes the steps of increasing the power generation output of the plurality of fuel cells based on the charge amount of the high-voltage battery in the controller, and controlling the plurality of fuel cells in the controller. With the power generation output increased, the deterioration rate ratio of each fuel cell is derived based on the output voltage compared to the current consumption of each fuel cell, and according to the deterioration rate rate derived from the controller, each fuel cell is It includes the step of differentially controlling the power generation output of the battery.

Before the step of increasing the power generation output of the plurality of fuel cells based on the charge amount of the high-voltage battery in the method for controlling the plurality of fuel cells of a fuel cell vehicle according to the present invention, the controller determines whether it is necessary to diagnose the degree of deterioration of the plurality of fuel cells. Additional steps may be included.

In the step of determining whether it is necessary to diagnose the degree of deterioration of a plurality of fuel cells in the method for controlling a plurality of fuel cells of a fuel cell vehicle according to the present invention, the controller determines whether the fuel cell is in a normal operating state and the output of the fuel cell is within the allowable output. By checking this, it is possible to determine whether it is necessary to diagnose the deterioration of multiple fuel cells.

In the step of determining whether it is necessary to diagnose the degree of deterioration of a plurality of fuel cells in the method for controlling a plurality of fuel cells of a fuel cell vehicle according to the present invention, the controller determines any of the charge amount of the high-voltage battery, the number of revolutions of the air compressor, or the temperature of the fuel cell. Based on this, it is possible to check whether the fuel cell is operating normally.

In the step of determining whether it is necessary to diagnose the degree of deterioration of a plurality of fuel cells in the method of controlling a plurality of fuel cells of a fuel cell vehicle according to the present invention, if the output of the fuel cell in the controller is within a preset standard output range, the output is within the allowable output range. It can be judged that

In the step of increasing the power generation output of a plurality of fuel cells based on the charge amount of the high-voltage battery in the method for controlling multiple fuel cells of a fuel cell vehicle according to the present invention, if the charge amount of the high-voltage battery is within a preset reference range in the controller, the power generation output of the plurality of fuel cells is increased. The power generation output of the fuel cell can be increased.

In the step of increasing the power generation output of the plurality of fuel cells based on the charge amount of the high-voltage battery in the method of controlling the plurality of fuel cells of the fuel cell vehicle according to the present invention, the controller increases the power generation output of the plurality of fuel cells to the maximum value. You can.

In the step of deriving the deterioration rate ratio of each fuel cell in the method for controlling a plurality of fuel cells of a fuel cell vehicle according to the present invention, the output voltage compared to the current consumed is an integral value obtained by integrating the total amount of current consumed during the driving time of the vehicle in the controller. It can be characterized as an average value of the output voltage of each fuel cell during the vehicle's driving time.

In the step of deriving the deterioration rate of each fuel cell in the method for controlling a plurality of fuel cells of a fuel cell vehicle according to the present invention, the controller calculates the output voltage compared to the current consumption of each fuel cell when the vehicle is driven on electricity and each fuel cell when the vehicle is driven during the current period. The deterioration rate of each fuel cell can be derived based on the difference in output voltage compared to current consumption.

In the step of deriving the deterioration rate ratio of each fuel cell in the method for controlling multiple fuel cells of a fuel cell vehicle according to the present invention, the deterioration rate ratios of each fuel cell derived from the controller are compared, and if the difference in deterioration rate rates is excessive, The deterioration rate of each fuel cell can be stored.

In the method of controlling a plurality of fuel cells of a fuel cell vehicle according to the present invention, the plurality of fuel cells are two fuel cells, and in the step of differentially controlling the power generation output of each fuel cell, the deterioration rate of each fuel cell stored in the controller is determined. By applying this to each fuel cell in reverse, the power generation output of each fuel cell can be differentially controlled.

The plurality of fuel cells control system for a fuel cell vehicle according to the present invention increases the power generation output of the plurality of fuel cells based on the charge amount of the plurality of fuel cells and the high voltage battery that provides the required output of the vehicle, and With the power generation output increased, the deterioration rate of each fuel cell is derived based on the output voltage compared to the current consumption of each fuel cell, and according to the derived deterioration rate rate, the power generation of each fuel cell is determined during the next run of the fuel cell vehicle. Includes a controller that differentially controls output.

According to the method and control system for controlling multiple fuel cells of a fuel cell vehicle of the present invention, the deterioration rate of each fuel cell is derived based on the output voltage compared to the current consumption of the plurality of fuel cells, and according to the derived deterioration rate rate. By differentially controlling the power generation output of each fuel cell, the degree of deterioration of a plurality of fuel cells can be managed equally.

1 is a flowchart of a method for controlling a plurality of fuel cells of a fuel cell vehicle according to an embodiment of the present invention.
Figure 2 is a graph showing the tendency for output voltage to decrease compared to the same current when the fuel cell deteriorates.
Figure 3 is a graph showing the tendency for power generation output to decrease compared to the same current when the fuel cell deteriorates.
FIG. 4 is a graph showing increasing the power generation output of a plurality of fuel cells based on the charge amount of a high-voltage battery in a method for controlling a plurality of fuel cells of a fuel cell vehicle according to an embodiment of the present invention.
Figure 5 is a diagram showing a plurality of fuel cell control systems of a fuel cell vehicle according to an embodiment of the present invention.

Throughout this specification, when a part “includes” a certain component, this means that it may further include other components rather than excluding other components, unless specifically stated to the contrary.

In addition, terms such as first and/or second may be used to describe various components, but these terms are only used to distinguish the component from other components, for example, from the scope of rights according to the concept of the present invention. Without exception, the first component may be referred to as the second component, and similarly the second component may also be referred to as the first component.

Hereinafter, the configuration and operating principles of various embodiments of the disclosed invention will be described in detail with reference to the attached drawings.

FIG. 1 is a flowchart of a method for controlling a plurality of fuel cells of a fuel cell vehicle according to an embodiment of the present invention, and FIG. 2 is a graph showing the tendency of the output voltage to decrease compared to the same current when the fuel cell 200 is deteriorated. , FIG. 3 is a graph showing the tendency for the power generation output to decrease compared to the same current when the fuel cell 200 is deteriorated, and FIG. 4 is a graph showing the tendency of the power generation output to decrease compared to the same current, and FIG. 4 is a graph showing the tendency of the high voltage It is a graph showing increasing the power generation output of the plurality of fuel cells 200 based on the charge amount of the battery 100, and FIG. 5 shows control of the plurality of fuel cells 200 of the fuel cell vehicle according to an embodiment of the present invention. This is a drawing showing the system.

Referring to FIG. 1, the method for controlling a plurality of fuel cells of a fuel cell vehicle according to the present invention includes a step of increasing the power generation output of the plurality of fuel cells based on the charge amount of the high voltage battery in the controller (S400), and the step of increasing the power generation output of the plurality of fuel cells in the controller based on the charge amount of the high voltage battery. With the power generation output of the fuel cell increased, the deterioration rate ratio of each fuel cell is derived based on the output voltage compared to the current consumption of each fuel cell (S510, S520, S530) and the deterioration rate rate derived from the controller Accordingly, a step (S600) of differentially controlling the power generation output of each fuel cell during the next driving of the fuel cell vehicle is included.

In the method for controlling multiple fuel cells of a fuel cell vehicle according to the present invention, the fuel cell vehicle can be understood to mean a fuel cell vehicle requiring relatively high output, and a fuel cell equipped with at least two or more fuel cells. It is assumed to be an electric vehicle.

In the method for controlling multiple fuel cells of a fuel cell vehicle according to the present invention, the charge amount of the high-voltage battery 100 refers to a value expressed as a percentage (%) divided by the currently usable battery capacity by the total capacity, and is generally It is expressed as ‘SOC (State of Charge)’. If the charge of the high-voltage battery 100 is 100%, it means that the battery is fully charged. Conversely, if the charge of the high-voltage battery 100 is 0%, it means that the battery is completely exhausted.

In addition, in this specification, 'deterioration rate' or 'deterioration rate' are used with the same meaning, and are preferably understood as an indicator indicating the degree of deterioration of each fuel cell.

To help understand the present invention, the phenomenon of voltage drop compared to the same current when deterioration occurs due to use of a general fuel cell 200 and the resulting problems will first be examined with reference to FIGS. 2 and 3.

FIG. 2 is a graph showing the tendency for output voltage to decrease relative to the same current when the fuel cell 200 is deteriorated, and FIG. 3 is a graph showing the tendency for power generation output to decrease relative to the same current when the fuel cell 200 is deteriorated. am.

Figure 2 shows the current-voltage trend curve (A) of a fuel cell in which deterioration has not progressed and the current-voltage trend curve (B) in a fuel cell in which deterioration has progressed, and Figure 3 shows the current-voltage trend curve (B) of a fuel cell in which deterioration has not progressed. The current-output trend curve (C) and the current-output trend curve (D) of the deteriorated fuel cell are shown.

Here, a fuel cell with no deterioration refers to a fuel cell in a fresh state (Beginning of Life, BOL), which means an initial fuel cell, and a fuel cell with advanced deterioration refers to a fuel cell with a required lifespan (End of Life, EOL) depending on the deterioration. It can be understood to mean a fuel cell that needs to be replaced after this or a fuel cell in the middle of life (MOL) that is gradually progressing from the BOL state to the EOL state.

First, looking at FIG. 2, it can be seen that the current-voltage trend curve (A) of the fuel cell that has not deteriorated based on the same current is located above the current-voltage trend curve (B) of the fuel cell that has deteriorated. .

In other words, a voltage drop phenomenon occurs in which the output voltage of a deteriorated fuel cell falls compared to the same current.

And looking at FIG. 3, it can be seen that the current-output trend curve (C) of the fuel cell that has not deteriorated based on the same current is located above the current-output trend curve (D) of the fuel cell that has deteriorated. .

In other words, due to the voltage drop phenomenon in which the output voltage of a deteriorated fuel cell is lowered compared to the same current as seen above, the power generation output expressed as the product of current and voltage also decreases compared to the same current.

Therefore, as the fuel cell 200 deteriorates, more current is required to generate the same output. As more current is used, the deterioration phenomenon of the fuel cell 200 accelerates, resulting in differences in the degree of deterioration of each of the plurality of fuel cells 200.

If there is a difference in the degree of deterioration of each of the plurality of fuel cells 200, in the case where one or more fuel cells among the plurality of fuel cells 200 are deteriorated to the extent that replacement is necessary, the deterioration is relatively less. There is a problem that additional unnecessary maintenance costs are incurred because all fuel cells, including those that do not yet need to be replaced, must be replaced.

Accordingly, conventionally, as shown in FIG. 1, equal control has been performed to equally control the power generation output of each fuel cell (S200). However, even if each fuel cell 200 is controlled equally, each fuel cell 200 may be used differently due to reasons such as differences in the usage load of each fuel cell 200, differences in manufacturing of cells inside the fuel cell 200 stack, and differences in materials used. The degree of deterioration is bound to vary.

Here, as shown in Figure 5, the usage load is a hydrogen supply system that supplies hydrogen as a fuel, an air supply system that supplies oxygen as a reactant with hydrogen, and a system that manages heat and water that are by-products of the electrochemical reaction of hydrogen and oxygen. It can be understood to mean a fuel cell peripheral device (BOP, Balance of Plant, 30) including a management system, etc., or a vehicle cooling compressor (40), which is a component of the vehicle's interior air conditioning system.

If uniform control is continuously implemented while there is a difference in the degree of deterioration due to differences in usage load, etc., the deterioration of the fuel cell with a relatively severe degree of deterioration is accelerated, resulting in a difference in the rate of deterioration.

Accordingly, the method for controlling a plurality of fuel cells of a fuel cell vehicle according to the present invention includes the step of increasing the power generation output of the plurality of fuel cells based on the charge amount of the high-voltage battery in the controller (S400), and the step of increasing the power generation output of the plurality of fuel cells in the controller. With the output increased, a step of deriving the deterioration rate of each fuel cell based on the output voltage compared to the current consumption of each fuel cell (S510, S520, S530) and the fuel cell vehicle according to the deterioration rate derived from the controller. Including the step (S600) of differentially controlling the power generation output of each fuel cell during the next driving of the fuel cell, the deterioration progress rate of each of the plurality of fuel cells is managed equally.

Specifically, in the step (S400) of increasing the power generation output of a plurality of fuel cells in the controller based on the charge amount of the high-voltage battery, if the charge amount of the high-voltage battery is sufficient to satisfy the required output of the fuel cell vehicle, the power generation output of the fuel cell is increased. We intend to generate surplus output by increasing the surplus output and use the surplus output to determine the deterioration rate of each fuel cell 200 while the fuel cell vehicle is running.

In other words, since there is no effect on the required output of the fuel cell vehicle, it is possible to determine the deterioration rate of each fuel cell 200 while driving the vehicle stably. The detailed operating principle of this will be described later.

And with the controller increasing the power generation output of a plurality of fuel cells, in the steps (S510, S520, and S530) of deriving the deterioration rate of each fuel cell based on the output voltage compared to the current consumption of each fuel cell, As seen with reference to Figures 2 and 3, as the deterioration of the fuel cell 200 progresses due to the phenomenon of a drop in voltage compared to the same current due to the deterioration of the fuel cell 200, more power is required to generate the same output than before. We would like to determine the deterioration rate of each fuel cell 200 by utilizing the fact that current is required.

In other words, even if the same power generation output is required for each fuel cell 200, the actual amount of charge used is different depending on the deterioration rate of each fuel cell 200, so the output voltage is also different. In other words, the deterioration rate of the fuel cell 200 can be derived through the ratio of the output voltage to the amount of charge used by the fuel cell 200. At this time, the ratio of the output voltage to the amount of charge used was derived through a number of experiments in advance. You can use the data map provided. For reference, the data map may be stored in a memory (not shown) built into the controller 300.

Here, the amount of electric charge can be derived by integrating the current consumed during the usage time of the fuel cell 200, and a detailed description of this will be provided later.

Continuing, in the step (S600) of differentially controlling the power generation output of each fuel cell during the next run of the fuel cell vehicle according to the deterioration rate derived from the controller, the previously derived deterioration rate rate is used to determine the fuel cell (fuel cell) with a high deterioration rate. An attempt is made to manage the deterioration progress rate of each of the plurality of fuel cells 200 equally by controlling the power generation output of the fuel cell 200 to decrease and the power generation output of the fuel cell 200 with a low deterioration rate to increase.

In other words, the deterioration rate derived above can be understood as a standard for determining the increase/decrease rate of the power generation output of each fuel cell 200, and specific control methods related to this will be described later.

As a result, according to the method for controlling a plurality of fuel cells of a fuel cell vehicle according to the present invention, power generation of each fuel cell 200 is performed according to the deterioration ratio derived based on the output voltage to the current consumption of the plurality of fuel cells 200. By differentially controlling the output, there is an effect of equally managing the deterioration progress rate of the plurality of fuel cells 200.

Hereinafter, we will look in more detail at the distinctive features of each step of the present invention.

Meanwhile, in the method for controlling a plurality of fuel cells of a fuel cell vehicle according to the present invention, additional control is performed by the controller 300 before the step of increasing the power generation output of the plurality of fuel cells based on the charge amount of the high voltage battery (S400). can be implemented.

Therefore, before explaining the step (S400) of increasing the power generation output of a plurality of fuel cells based on the charge amount of the high-voltage battery, various control methods that can be performed when starting and driving a typical fuel cell vehicle are briefly described, and this Let us first look at control methods that can be additionally performed in the invention.

Generally, when starting a fuel cell vehicle, a process may be performed to check whether the fuel cell system is operating normally. That is, when the driver attempts to start the vehicle, the FCU (Fuel-cell Control Unit) opens the valve of the hydrogen tank, checks the operation of the controller 300, and boosts and applies high voltage for use of the overall system.

At this time, general system failure diagnosis, such as checking the insulation resistance and high voltage of the fuel cell 200, may be performed, and if the system operates normally without problems, starting of the fuel cell vehicle is completed.

In the flowchart of the method for controlling a plurality of fuel cells of a fuel cell vehicle according to the present invention shown in FIG. 1, it is shown on the assumption that starting of the fuel cell vehicle has been completed.

First, when starting of the fuel cell vehicle is completed, driving of the fuel cell vehicle begins (S100). And, as previously discussed in the background technology, by first performing uniform control to equally control the power generation output of a plurality of fuel cells (S200), the degree of deterioration of each fuel cell 200 can be initially equally managed. there is.

However, this equal control (S200) does not necessarily need to be performed, and a step (S600) of differentially controlling the power generation output of each fuel cell during the next driving of the fuel cell vehicle according to the deterioration rate derived from the controller according to the present invention. It is desirable to understand that after performance, only differential control is performed, and equal control is no longer performed.

That is, Figure 1 simply shows that equalization control can be performed at S200 to facilitate understanding of the present invention, and this should not be construed as limiting the content of the present invention.

Continuing with reference to FIG. 1, before the step (S400) of increasing the power generation output of the plurality of fuel cells based on the charge amount of the high-voltage battery in the method of controlling the plurality of fuel cells of the fuel cell vehicle according to the present invention, the controller It may further include determining whether it is necessary to diagnose the deterioration of the fuel cell (S310, S320).

That is, the method for controlling multiple fuel cells of a fuel cell vehicle according to the present invention can additionally determine whether it is necessary to diagnose the degree of deterioration of each fuel cell 200 while the fuel cell vehicle is driving.

Specifically, in the step (S310, S320) of determining whether it is necessary to diagnose the degree of deterioration of a plurality of fuel cells in the method for controlling a plurality of fuel cells of a fuel cell vehicle according to the present invention, the controller determines whether the fuel cell is in a normal operating state (S310). ) and whether the output of the fuel cell is within the allowable output (S320), it is possible to determine whether it is necessary to diagnose the degree of deterioration of the plurality of fuel cells 200.

That is, in order to derive the deterioration rate by diagnosing the degree of deterioration of each fuel cell 200 in the method for controlling a plurality of fuel cells of a fuel cell vehicle according to the present invention, the fuel cell 200 must be in a normal operating state and the fuel cell (200) must be in a normal operating state. 200) may be required to be within the allowable output. To explain this, we will briefly look at the general driving modes of fuel cell vehicles.

The driving mode of a fuel cell vehicle generally consists of three modes: Hybrid Mode, FC Only Mode (Fuel Cell Only Mode), and EV Mode (Electric Vehicle Mode). Here, the hybrid mode refers to a driving mode that drives both the fuel cell 200 and the high-voltage battery 100, and the FC Only mode refers to a mode that drives only the fuel cell 200 and does not drive the high-voltage battery 100, and EV This mode refers to a mode in which only the high-voltage battery 100 is driven without driving the fuel cell 200.

Each mode is applied differently depending on the vehicle's driving conditions (road conditions, required power, etc.) and is controlled to optimize performance, such as fuel efficiency, of the fuel cell vehicle.

Let's look at the control of each mode in more detail. In hybrid mode, the power generation amount of the fuel cell 200 and the charging amount of the high-voltage battery 100 are used simultaneously to meet the required output of the fuel cell vehicle. On the other hand, in FC Only mode, only the power generation amount of the fuel cell 200 is used, and in EV mode, only the charge amount of the high-voltage battery 100 is used and controlled to meet the required output of the fuel cell vehicle.

Therefore, when the driving mode of the fuel cell vehicle is EV mode, the fuel cell 200 is not driven, so the deterioration rate according to use of each fuel cell 200 cannot be derived.

In other words, in the present invention, 'whether the fuel cell is in a normal driving state' can be understood to basically mean whether the driving mode of the vehicle corresponds to hybrid mode or FC only mode rather than EV mode. However, FC Only mode and EV mode are emergency driving modes in preparation for emergencies, and if no problems occur with the high-voltage battery 100 or fuel cell 200, the fuel cell vehicle is generally driven in hybrid mode. .

Therefore, in the present invention, it is more preferable to understand 'whether the fuel cell is in a normal operating state' to mean whether the driving mode of the vehicle corresponds to a hybrid mode rather than an emergency driving mode (EV mode or FC Only mode). To facilitate understanding of the present invention, the following specification will be described on the premise that 'whether the fuel cell is in a normal driving state' means whether the driving mode of the fuel cell vehicle corresponds to the hybrid mode.

Continuing with the present invention, we will look at 'whether the output of the fuel cell is within the allowable output'. As described above, in the step (S400) of increasing the power generation output of the plurality of fuel cells based on the charge amount of the high-voltage battery in the controller of the method for controlling the plurality of fuel cells of the fuel cell vehicle according to the present invention, the driving of the fuel cell vehicle is performed. By increasing the power generation output of each fuel cell 200 to generate surplus output and using this surplus output to determine the deterioration rate of each fuel cell 200, the state in which the required output is satisfied while the fuel cell vehicle is driving is determined. It is intended to determine the deterioration rate of each fuel cell 200 while maintaining the deterioration rate of each fuel cell 200.

Meanwhile, the maximum output of the fuel cell 200 is determined according to the required output of the fuel cell vehicle, and the power generation output of the fuel cell 200 is determined based on the required output of the fuel cell vehicle and the charge amount of the high-voltage battery 100. do. For example, if the required output of the fuel cell vehicle is 10kW, the maximum output of the fuel cell 200 is determined to be 10kW, and the high-voltage battery 100 is discharged based on the charge amount of the high-voltage battery 100 to produce an output of 3kW. If it can be generated, the power generation output of the fuel cell 200 can be determined to be 7kW.

If the charge of the high-voltage battery 100 is insufficient and the power generation output of the fuel cell 200 is equal to the maximum output, the controller of the multiple fuel cell control method of the fuel cell vehicle according to the present invention determines the charge amount of the high-voltage battery. In the step of increasing the power generation output of a plurality of fuel cells (S400), it is impossible to generate surplus power by increasing the power generation output of each fuel cell 200.

That is, in the present invention, 'whether the output of the fuel cell is within the allowable output' is understood to mean whether the current output of the fuel cell 200 is in a state capable of generating the above surplus output while the vehicle is running. It can be.

For reference, the state in which surplus output can be generated here assumes that the power generation output of the fuel cell 200 is lower than the maximum output, and a certain reference range is set so that the power generation output of the fuel cell 200 is within the standard range. It can be judged depending on whether it is within or not.

Hereinafter, we will look at the determination of 'whether the fuel cell is in a normal operating state' and 'whether the output of the fuel cell is within the allowable output' in more detail.

First, looking at 'whether the fuel cell is in a normal operating state', in the steps (S310, S320) of determining whether it is necessary to diagnose the deterioration of the plurality of fuel cells in the method for controlling the plurality of fuel cells of a fuel cell vehicle according to the present invention. , the controller can check whether the fuel cell is in a normal operating state (S310) based on any one of the charge amount of the high-voltage battery, the rotation speed of the air compressor, or the temperature of the fuel cell.

When the driving mode of the fuel cell vehicle is hybrid mode, both the high-voltage battery 100 and the fuel cell 200 are used, so the required output of the fuel cell vehicle is the discharge output of the high-voltage battery 100 and the fuel cell 200. ) is satisfied by adding up the power generation output.

At this time, the output (discharge output) generated according to the discharge of the high-voltage battery 100 is determined based on the charge amount of the high-voltage battery 100. Therefore, when performing hybrid mode driving, it is necessary to maintain the charge amount of the high-voltage battery 100 at an appropriate level in order to control the power generation output of the fuel cell 200.

Accordingly, the method for controlling multiple fuel cells of a fuel cell vehicle according to the present invention increases the power generation output of the fuel cell in the future by checking whether the fuel cell 200 is in a normal operating state based on the charge amount of the high voltage battery 100. It is intended to easily control the power generation output of the fuel cell 200 in the step (S400). Since the control for maintaining the charge amount of the high-voltage battery 100 at an appropriate level is self-evident in the technical field of the present invention, detailed description thereof will be omitted.

Additionally, the present invention can check whether the fuel cell 200 is in a normal operating state based on the rotation speed of the air compressor.

Fuel cell vehicles are equipped with a fuel cell system, which consists of a fuel cell stack stacked with a plurality of fuel cells (200) used as a power source, a fuel supply system that supplies hydrogen, etc. as a fuel to the fuel cell stack, and electricity. It includes an air supply system that supplies oxygen, an oxidizing agent necessary for chemical reactions, and a heat management system that uses coolant to control the temperature of the fuel cell stack.

Here, the air supply system adjusts the amount of oxygen supplied by controlling the rotation speed of the air compressor. In particular, in the case of a commercial fuel cell vehicle, when the charge of the high-voltage battery 100 is at an appropriate level and the rotation speed of the air compressor is above a certain value, the fuel cell 200 is controlled to start operation.

Therefore, the present invention seeks to determine whether the fuel cell 200 is in a normal operating state based on the rotation speed of the air compressor. Since the control for determining whether the rotational speed of the air compressor is above a certain value is self-evident in the technical field of the present invention, a detailed description thereof will be omitted.

In addition, the present invention can check whether the fuel cell 200 is in a normal operating state based on the temperature of the fuel cell 200.

The fuel cell 200 is a device that receives hydrogen and air from the outside and generates electrical energy through an electrochemical reaction inside the fuel cell stack, and there is an operating temperature for the reaction of hydrogen and oxygen.

Therefore, in order to operate the fuel cell 200 normally, it is necessary to increase the temperature of the fuel cell 200 to the operating temperature. When the temperature of the fuel cell 200 is lower than the operating temperature, precision in controlling the power generation output of the fuel cell 200 is reduced.

As a result, it is difficult to control the increase in power generation output of the fuel cell 200 in the step of increasing the power generation output of the fuel cell (S400), and accordingly, the deterioration rate of each fuel cell 200 cannot be accurately derived. .

Accordingly, the present invention confirms whether the fuel cell 200 is in a normal operating state by determining whether the temperature of the fuel cell 200 corresponds to the operating temperature, and ultimately derives the deterioration rate of each fuel cell 200. The goal is to improve accuracy.

Continuing to look at 'whether the output of the fuel cell is within the allowable output', the step of determining whether it is necessary to diagnose the degree of deterioration of the plurality of fuel cells in the method of controlling the plurality of fuel cells of a fuel cell vehicle according to the present invention (S310) , S320), if the output of the fuel cell is within a preset reference output range, the controller may determine that the output is within the allowable output (S320).

As discussed above, in the present invention, 'whether the output of the fuel cell is within the allowable output' refers to whether the current output of the fuel cell 200 is in a state capable of generating surplus output while the vehicle is running. It can be understood, and here, the state in which surplus output can be generated is set a certain reference range on the premise that the power generation output of the fuel cell 200 is lower than the maximum output, and the power generation output of the fuel cell 200 is set as the standard. It can be judged depending on whether it is within the range or not.

That is, in the present invention, the 'pre-prepared reference output range' is a reference range that can generate surplus output of the fuel cell 200 to determine the deterioration rate of each fuel cell 200, and is converted into data through multiple experiments. It can be understood as a kind of experimental value. These experimental values can be stored in a memory (not shown) built into the controller 300.

As a result, if the output of the fuel cell 200 is within the preset reference output range, it is determined to be within the allowable output, and the power generation output of the plurality of fuel cells is increased based on the charge amount of the high-voltage battery later (S400) ), it is possible to generate surplus output through control of increasing the power generation output of the fuel cell 200.

FIG. 4 is a graph showing increasing the power generation output of the plurality of fuel cells 200 based on the charge amount of the high-voltage battery 100 in the method of controlling the plurality of fuel cells of the fuel cell vehicle according to an embodiment of the present invention.

Referring to FIG. 4, in the step (S400) of increasing the power generation output of the plurality of fuel cells based on the charge amount of the high voltage battery in the method of controlling the plurality of fuel cells of the fuel cell vehicle according to the present invention, the controller 300 controls the high voltage. When the charge amount of the battery 100 is within a preset standard range, the power generation output of the plurality of fuel cells 200 can be increased.

In FIG. 4, the x-axis represents the charge amount of the high-voltage battery 100, and the y-axis represents the power generation output of the fuel cell 200.

That is, when the charge of the high-voltage battery 100 is low, the maximum power output (E) is required for the power generation output of the fuel cell 200, and as the charge of the high-voltage battery 100 increases, the power generation output of the fuel cell 200 is required. The value gradually decreases. And when the charge of the high voltage battery 100 reaches the maximum charge (F), the power generation output of the fuel cell 200 may no longer be required.

Therefore, in order to control the increase in power generation output of the fuel cell 200, the charge amount of the high voltage battery 100 needs to be within an appropriate range.

In other words, if the charge of the high-voltage battery 100 is too low, the maximum power output (E) is required for the power generation output of the fuel cell 200, so the minimum charge of the high-voltage battery 100 must be set, and the minimum charge of the high-voltage battery 100 must be set. If the charge amount is too high, as will be described later, when increasing the power generation output of the fuel cell 200 to the maximum value, excessive output is required, which reduces the stability of the fuel cell vehicle, so the high-voltage battery 100 The maximum charge amount must be set.

That is, in the present invention, the 'prepared reference range' can be understood to mean the section from the minimum charge amount to the maximum charge amount of the high-voltage battery 100 set as above. And this section is expressed in FIG. 4 as 'a section (G) for increasing the power generation output of the plurality of fuel cells 200 based on the charge amount of the high-voltage battery 100'.

Continuing, in the step (S400) of increasing the power generation output of the plurality of fuel cells based on the charge amount of the high-voltage battery of the method for controlling the plurality of fuel cells of the fuel cell vehicle according to the present invention, the controller 300 controls the plurality of fuel cells. The power generation output of (200) can be increased to the maximum value.

Referring to FIG. 4, it can be seen that the power generation output of the fuel cell 200 is increased in section G. At this time, it can be seen that the power generation output of the fuel cell 200 increases to the maximum output (E) at the minimum point in the G section, but does not increase to the maximum output in the remaining sections of the G section. That is, the maximum value of the power generation output of the fuel cell 200 for each section is set in the remaining sections except for the minimum point of the G section.

When controlling the increase in power generation output of the fuel cell 200, if the power generation output is increased without any restrictions, excessive output is required, which adversely affects the durability of the fuel cell 200, and thus reduces the stability of the fuel cell vehicle. A problem arises.

Therefore, when increasing the power generation output of the fuel cell 200, it is necessary to set a limit value so that the power output does not increase beyond a certain level. In other words, the 'maximum value' in the present invention can be understood as a kind of limit value set to prevent the above problem.

As a result, by increasing the power generation output of the plurality of fuel cells 200 based on the maximum value set in this way, it is possible to measure the deterioration rate of each fuel cell 200 while preventing the problem of deterioration in the stability of the fuel cell vehicle. It works.

1 is a flowchart of a method for controlling a plurality of fuel cells of a fuel cell vehicle according to an embodiment of the present invention.

Referring to FIG. 1, in the steps (S510, S520, and S530) of deriving the deterioration rate of each fuel cell in the method for controlling a plurality of fuel cells of a fuel cell vehicle according to the present invention, the output voltage compared to the consumed current is calculated by the controller 300. ) may be characterized as an average value of the output voltage of each fuel cell 200 during the vehicle's driving time compared to the integral value obtained by integrating the total amount of current consumed during the vehicle's driving time. In addition, the controller can derive the deterioration rate of each fuel cell based on the difference between the output voltage compared to the current consumption of each fuel cell when the vehicle is running electric and the output voltage compared to the current consumption of each fuel cell when the vehicle is running (S510). .

As shown in FIG. 1, in the present invention, the deterioration rate of each fuel cell 200 is derived by the following equation.

[Equation 1]

In equation 1 above, is the average value of the output voltage of each fuel cell 200 during the driving time of the fuel cell vehicle when electric driving, is the average value of the output voltage of each fuel cell 200 during the current driving time of the fuel cell vehicle, means the amount of charge actually used by each fuel cell 200 during the current driving time of the fuel cell vehicle.

In the following specification, the time from the start to the end of the fuel cell vehicle will be expressed as '1 DC (Driving Cycle)' as one driving cycle. In other words, 'current driving' of a fuel cell vehicle refers to the current driving cycle, and 'electric driving' refers to the previous driving cycle.

For example, if the previous driving cycle is considered '1 DC', the current driving cycle is '2 DC'. In Equation 1 above, electric driving is expressed as 'N-1', and electric driving is expressed as 'N' to distinguish them.

And in Equation 1 above, Looking at , it can be seen that the actual amount of charge used is derived from the integral value obtained by integrating the total amount of current consumed during the current driving time of the fuel cell vehicle. in other words, In , 'FC Cur' refers to the current consumption of each fuel cell 200, and 'n' refers to the current driving time of the fuel cell vehicle.

With reference to Equation 1 above, we will look in detail at the method of calculating the deterioration rate of each fuel cell 200 in the present invention.

First, when a fuel cell vehicle is driven electrically, the average value of the output voltage of each fuel cell 200 during the vehicle's driving time is ( ) can utilize the value derived during electric driving of the fuel cell vehicle and stored in the memory (not shown) built into the controller 300.

Next, the average value of the output voltage of each fuel cell 200 during the current driving time of the fuel cell vehicle ( ) can be derived during current driving of the fuel cell vehicle and stored in a memory (not shown) built into the controller 300.

In addition, the controller 300 determines the average output voltage of each fuel cell 200 during the electric driving of the fuel cell vehicle ( ) and the average value of the output voltage of each fuel cell 200 during the current driving time of the fuel cell vehicle ( From the difference in ( ) is derived. The average change in output voltage of the fuel cell 200 ( ) is the amount of charge actually used in each fuel cell 200 during the current driving time of the fuel cell vehicle ( ) to calculate the deterioration rate of each fuel cell 200.

Here, since each fuel cell 200 has a difference in degree of deterioration, even if the same power generation output is required for each fuel cell 200, the actual used charge amount ( ) becomes different.

And the actual amount of charge used ( ) is different, so the average change in output voltage of the fuel cell 200 ( ) is also derived differently for each fuel cell 200.

Ultimately, the actual used charge of the fuel cell 200 ( ), the average change in output voltage ( ) is derived differently for each fuel cell 200.

That is, the actual used charge amount of the fuel cell 200 finally derived for each fuel cell 200 ( ), the average change in output voltage ( ) are compared with each other to derive the ratio, it is possible to derive a deterioration rate ratio based on the difference in deterioration degree of each fuel cell 200.

Therefore, based on this principle, the method for controlling a plurality of fuel cells of a fuel cell vehicle according to the present invention is to compare the output voltage to the consumed current by the integral value obtained by integrating the total amount of current consumed during the driving time of the vehicle in the controller 300. The average value is the average of the output voltage of each fuel cell 200 during the vehicle's driving time, where the output voltage of each fuel cell 200 is the output voltage compared to the current consumption of each fuel cell 200 during the vehicle's electric driving and the vehicle. By specifying the difference in output voltage compared to current consumption of each fuel cell 200 during current driving, it is possible to derive the deterioration rate of each fuel cell 200.

Continuing, in the step (S510, S520, S530) of deriving the deterioration rate of each fuel cell in the method for controlling a plurality of fuel cells of a fuel cell vehicle according to the present invention, the deterioration rate of each fuel cell derived from the controller is compared. And (S520), if the difference in the rate of deterioration is excessive, the rate of deterioration of each fuel cell can be stored (S530).

In FIG. 1, each fuel cell 200 is depicted as a first fuel cell and a second fuel cell, assuming two fuel cells. This is merely an exemplary description to aid understanding of the present invention, and the content of the present invention should not be viewed as limited by the description of these drawings.

Looking at Figure 1, it can be seen that the deterioration rate of the first fuel cell is expressed as 'α' and the deterioration rate of the second fuel cell is expressed as 'β'.

Then, the deterioration rate ratio (α) of the first fuel cell is compared with the deterioration rate rate (β) of the second fuel cell to determine whether the difference is excessive. In Figure 1, this is referred to as ' It is described and illustrated as follows.

That is, when the deterioration rate ratio (β) of the second fuel cell divided by the deterioration rate rate (α) of the first fuel cell is outside a certain range, the deterioration rate rate (α) of the first fuel cell and the second fuel It can be judged that the difference in the deterioration rate (β) of the battery is excessive.

On the other hand, when the deterioration rate ratio (β) of the second fuel cell divided by the deterioration rate rate (α) of the first fuel cell falls within a certain range, the deterioration rate ratio (α) of the first fuel cell and the first fuel cell 2 It can be judged that the difference in the deterioration rate (β) of the fuel cell is not excessive.

For reference, here, a certain range can be understood to mean the range from '0.95' to '1.05', which is written as a number in FIG. 1. However, these numbers are merely illustrative descriptions to aid understanding of the present invention, and the content of the present invention should not be viewed as limited by these descriptions.

As a result of comparing the deterioration rate ratio of each fuel cell 200, if the difference in deterioration rate rate is determined to be excessive, the controller 300 stores the deterioration rate rate of each fuel cell 200. The deterioration rate of each fuel cell 200 may be stored in a memory (not shown) built into the controller 300.

In addition, the controller 300 can differentially control the power generation output of each fuel cell 200 during the next driving of the fuel cell vehicle according to the stored deterioration rate of each fuel cell 200. Accordingly, there is an effect of equally managing the degree of deterioration of the plurality of fuel cells 200.

Meanwhile, in the method for controlling a plurality of fuel cells of a fuel cell vehicle according to the present invention, the plurality of fuel cells 200 are two fuel cells, and in the step (S600) of differentially controlling the power generation output of each fuel cell, the controller 300 ), the deterioration rate of each fuel cell 200 stored in can be applied inversely to each fuel cell 200 to differentially control the power generation output of each fuel cell 200.

In the case of a fuel cell vehicle equipped with two fuel cells, the power generation output of the fuel cell with a relatively high deterioration rate is reduced, and the power generation output of the fuel cell with a relatively low deterioration rate is increased. It can be understood as wanting to control.

Referring to Figure 1, let's look at it in more detail. If the deterioration rate ratio (α) of the first fuel cell is greater than the deterioration rate rate (β) of the second fuel cell, the controller 300 determines the deterioration rate rate (α) of the first fuel cell and the deterioration rate rate (α) of the second fuel cell. The power generation output of the second fuel cell is controlled by the ratio of the deterioration rate ratio (α) of the first fuel cell to the sum of the deterioration rate ratios (β).

At the same time, the controller 300 controls the ratio of the deterioration degree ratio (β) of the second fuel cell to the sum of the deterioration degree ratio (α) of the first fuel cell and the deterioration degree rate (β) of the second fuel cell. Controls the power generation output of the first fuel cell.

In other words, by applying the deterioration rate of each fuel cell 200 inversely to each fuel cell 200, the power generation output of the first fuel cell is controlled to decrease and the power generation output of the second fuel cell is increased.

As a result, the rate of increase/decrease in the power generation output of each fuel cell 200 is adjusted according to the rate of deterioration of each fuel cell 200, so that the degree of deterioration of each fuel cell 200 can be managed equally.

Figure 5 is a diagram showing a plurality of fuel cell control systems of a fuel cell vehicle according to an embodiment of the present invention.

Referring to FIG. 5, the plurality of fuel cells control system of the fuel cell vehicle according to the present invention controls the plurality of fuels based on the charge amount of the plurality of fuel cells 200 and the high voltage battery 100 that provide the required output of the vehicle. In a state where the power generation output of the battery 200 is increased and the power generation output of the plurality of fuel cells 200 is increased, the deterioration of each fuel cell 200 is deteriorated based on the output voltage compared to the current consumption of each fuel cell 200. It includes a controller 300 that derives the degree ratio and differentially controls the power generation output of each fuel cell 200 during the next run of the fuel cell vehicle according to the derived deterioration rate rate.

As discussed above, the fuel cell system mounted on a fuel cell vehicle includes a fuel cell 200, a fuel supply system that supplies fuel to the fuel cell 200, and an air supply system that supplies oxygen.

However, in Figure 5, to facilitate understanding of the present invention, the fuel supply system and air supply system among the components of the fuel cell system are simplified and shown as included in the fuel cell peripheral device (BOP, Balance of Plant, 30).

For reference, the load of the fuel cell 200 may be understood to include the vehicle cooling compressor 40 shown in FIG. 5 in addition to the fuel cell peripheral device (BOP, 30).

Meanwhile, the fuel cell system includes a high-voltage junction box 10, a fuel cell 200, and a high-voltage junction box ( 10) may further include a converter 20 provided between them.

Although only two fuel cells are shown in Figure 5, it is natural that two or more fuel cells can be provided depending on design conditions and applied vehicles.

In the following specification, among the two fuel cells shown in FIG. 5, the fuel cell shown at the top will be defined as the first fuel cell, and the fuel cell shown at the bottom will be defined as the second fuel cell.

Referring to FIG. 5, the first fuel cell is connected to the high voltage junction box 10 through the converter 20, but only supplies power to the fuel cell peripheral device (BOP, 30) and supplies power to the vehicle cooling compressor 40. does not supply On the other hand, it can be seen that the second fuel cell is connected to the high voltage junction box 10 through the converter 20 and supplies power to both the fuel cell peripheral device (BOP, 30) and the vehicle cooling compressor 40.

In other words, as seen above, differences in usage load may occur for each fuel cell 200, and accordingly, differences may occur in the degree of deterioration of each fuel cell 200.

Therefore, the plurality of fuel cells control system of the fuel cell vehicle according to the present invention increases the power generation output of the plurality of fuel cells 200 based on the charge amount of the high voltage battery 100 and generates power generation of the plurality of fuel cells 200. In a state where the output is increased, the deterioration rate of each fuel cell 200 is derived based on the output voltage compared to the current consumption of each fuel cell 200, and according to the derived deterioration rate rate, the next driving time of the fuel cell vehicle Including the controller 300 that differentially controls the power generation output of the fuel cell 200, it is intended to minimize differences in the degree of deterioration of each fuel cell 200 as described above.

Here, the specific control method or operating principle by the controller 300 has been described in detail in the method for controlling a plurality of fuel cells of a fuel cell vehicle according to the present invention, and repeated description thereof will be omitted.

Therefore, according to the method and control system for controlling a plurality of fuel cells of a fuel cell vehicle of the present invention as described above, the degree of degradation of each fuel cell 200 is determined based on the output voltage compared to the current consumption of the plurality of fuel cells 200. There is an advantage in that the degree of deterioration of a plurality of fuel cells 200 can be managed equally by deriving the rate and differentially controlling the power generation output of each fuel cell 200 according to the derived deterioration rate rate.

Although the invention has been shown and described in relation to specific embodiments, it is commonly known in the art that the present invention can be modified and changed in various ways without departing from the technical spirit of the invention as provided by the following claims. It will be self-evident to those with knowledge.

10: High voltage junction box
20: converter
30: Fuel cell peripheral device
40: Compressor for vehicle cooling
100: high voltage battery
200: Fuel cell
300: controller
A: Current-voltage trend curve of a fuel cell with no deterioration
B: Current-voltage trend curve of a deteriorated fuel cell
C: Current-output trend curve of a fuel cell with no deterioration
D: Current-output trend curve of deteriorated fuel cell
E: Maximum output of multiple fuel cells
F: High voltage battery maximum charge
G: Section where the power generation output of multiple fuel cells is increased based on the charge amount of the high-voltage battery

Claims (12)

Increasing the power generation output of a plurality of fuel cells based on the charge amount of the high-voltage battery in the controller;
With the controller increasing the power generation output of a plurality of fuel cells, deriving a deterioration rate of each fuel cell based on the output voltage compared to the current consumption of each fuel cell; and
A method of controlling a plurality of fuel cells in a fuel cell vehicle comprising: differentially controlling the power generation output of each fuel cell during the next driving of the fuel cell vehicle according to the deterioration rate derived from the controller.
In claim 1,
Before the step of increasing the power generation output of multiple fuel cells based on the charge amount of the high-voltage battery,
A method for controlling a plurality of fuel cells in a fuel cell vehicle, further comprising: determining, at the controller, whether it is necessary to diagnose the degree of deterioration of the plurality of fuel cells.
In claim 2,
In the step of determining whether a deterioration degree diagnosis of a plurality of fuel cells is necessary, the controller determines whether a deterioration degree diagnosis of a plurality of fuel cells is necessary by checking whether the fuel cell is in a normal operating state and whether the output of the fuel cell is within the allowable output. A method for controlling a plurality of fuel cells in a fuel cell vehicle, characterized in that:
In claim 3,
In the step of determining whether it is necessary to diagnose the degree of deterioration of a plurality of fuel cells, the controller checks whether the fuel cells are in a normal operating state based on one of the charge amount of the high-voltage battery, the rotation speed of the air compressor, or the temperature of the fuel cell. A method for controlling multiple fuel cells of a fuel cell vehicle, characterized by:
In claim 3,
In the step of determining whether it is necessary to diagnose the degree of deterioration of the plurality of fuel cells, the controller determines that the output of the fuel cell is within the allowable output if it is within a preset standard output range. Control method.
In claim 1,
In the step of increasing the power generation output of the plurality of fuel cells based on the charge amount of the high-voltage battery, the controller increases the power generation output of the plurality of fuel cells when the charge amount of the high-voltage battery is within a preset standard range. Method for controlling multiple fuel cells in a vehicle.
In claim 1,
In the step of increasing the power generation output of the plurality of fuel cells based on the charge amount of the high-voltage battery, a method of controlling multiple fuel cells in a fuel cell vehicle, characterized in that the controller increases the power generation output of the plurality of fuel cells to the maximum value.
In claim 1,
In the step of deriving the deterioration ratio of each fuel cell, the output voltage compared to the current consumption is calculated by averaging the output voltage of each fuel cell during the vehicle's driving time compared to the integrated value of the total amount of current consumed during the vehicle's driving time in the controller. A method of controlling multiple fuel cells of a fuel cell vehicle, characterized in that the average value.
In claim 8,
In the step of deriving the deterioration rate of each fuel cell, the controller calculates the deterioration rate of each fuel cell based on the difference between the output voltage compared to the current consumption of each fuel cell when the vehicle is running on electricity and the output voltage compared to the current consumption of each fuel cell when the vehicle is currently running. A method for controlling multiple fuel cells in a fuel cell vehicle, characterized by deriving a deterioration rate.
In claim 1,
In the step of deriving the deterioration rate ratio of each fuel cell, the deterioration rate rate of each fuel cell derived from the controller is compared, and if the difference in deterioration rate rate is excessive, the deterioration rate rate of each fuel cell is stored. Method for controlling multiple fuel cells in an electric vehicle.
In claim 1,
The plurality of fuel cells is two fuel cells,
In the step of differentially controlling the power generation output of each fuel cell, the deterioration rate of each fuel cell stored in the controller is applied inversely to each fuel cell to differentially control the power generation output of each fuel cell. Multiple fuel cell control method.
In the multiple fuel cell control system of a fuel cell vehicle equipped with a high-voltage battery,
A plurality of fuel cells that provide the required output of the vehicle; and
Based on the charge amount of the high-voltage battery, the power generation output of the plurality of fuel cells is increased, and with the power generation output of the plurality of fuel cells increased, the deterioration rate of each fuel cell is determined based on the output voltage compared to the current consumption of each fuel cell. and a controller that differentially controls the power generation output of each fuel cell during the next run of the fuel cell vehicle according to the derived deterioration rate.

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