KR102706263B1 - Driving control system and control method of fuel cell vehicle - Google Patents

Abstract

A driving control system for a fuel cell vehicle is introduced, which includes: a fuel cell that generates electricity by receiving hydrogen and air respectively; a monitoring unit that monitors output voltages of a plurality of unit cells or fuel cells included in the fuel cell; a gradient determination unit that determines whether a gradient of a driving road is equal to or greater than a preset gradient; a condensation determination unit that determines whether condensate has accumulated inside the fuel cell based on the unit cell voltage monitored by the monitoring unit or the output voltage of the fuel cell when the gradient determination unit determines that the driving road is equal to or greater than the preset gradient; and an air supply control unit that increases the amount of air supplied to the fuel cell when the condensate determination unit determines that condensate has accumulated inside the fuel cell.

Description

{DRIVING CONTROL SYSTEM AND CONTROL METHOD OF FUEL CELL VEHICLE}

The present invention relates to a driving control system and control method for a fuel cell vehicle, and more particularly, to a driving control strategy for solving the problem of moisture condensing inside a fuel cell stack when driving on a slope.

A fuel cell converts chemical energy into electrical energy by utilizing the oxidation-reduction reaction of hydrogen and oxygen supplied from a hydrogen supply device and an air supply device, respectively, and includes a fuel cell stack that produces electrical energy and a cooling system for cooling it.

That is, hydrogen is supplied to the anode side of the fuel cell, and an oxidation reaction of hydrogen occurs at the anode to generate hydrogen ions (protons) and electrons (electrons). The hydrogen ions and electrons generated at this time move to the cathode through the electrolyte membrane, respectively. At the cathode, electrical energy is generated through an electrochemical reaction involving the hydrogen ions and electrons moved from the anode and oxygen in the air.

In particular, product water (H20) is generated by an electrochemical reaction in which hydrogen ions react with oxygen in the air, and the product water is discharged to the outside through a humidifier. However, there is a problem in that it is difficult for condensed water to be discharged to the air electrode or hydrogen electrode when a vehicle equipped with a fuel cell continues to drive on a slope.

In particular, there is a problem that the output voltage of the fuel cell stack becomes unstable or reverse voltage is formed when the condensate condensed on the air electrode is driven at low output or in FC Stop mode. In addition, according to actual experimental results, more condensate was generated on the air electrode than on the hydrogen electrode when the fuel cell vehicle was driven on a slope.

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

KR 10-2011-0075542 A

The present invention has been proposed to solve these problems, and aims to provide driving control for removing condensed water that is not discharged but condenses inside a fuel cell stack when driving on a slope.

In order to achieve the above object, the driving control system of a fuel cell vehicle according to the present invention includes: a fuel cell which generates electricity by receiving hydrogen and air respectively; a monitoring unit which monitors a plurality of unit cells included in the fuel cell or an output voltage of the fuel cell; a gradient determination unit which determines whether a gradient of a driving road is equal to or greater than a preset gradient; a condensation determination unit which determines whether condensate has accumulated inside the fuel cell based on the unit cell voltage monitored by the monitoring unit or the output voltage of the fuel cell when the gradient determination unit determines that the driving road is equal to or greater than the preset gradient; and an air supply control unit which increases the amount of air supplied to the fuel cell when the condensate determination unit determines that condensate has accumulated inside the fuel cell.

A gyro sensor for sensing a change in the inclination of a vehicle is further included, and a slope determination unit can determine whether the inclination of a driving road is greater than a preset inclination based on the change in the inclination of the vehicle sensed by the gyro sensor.

The vehicle further includes an atmospheric pressure sensor that senses atmospheric pressure outside the vehicle, and a slope determination unit can determine whether the slope of the driving road is greater than a preset slope based on the atmospheric pressure sensed by the atmospheric pressure sensor.

In the slope judgment unit, the slope of the driving road can be input from the navigation.

In the condensation judgment unit, if the output voltage of the fuel cell monitored by the monitoring unit is lower than the preset reference voltage, it can be determined that condensation has accumulated inside the fuel cell.

In the condensation judgment unit, it can be determined that condensation has accumulated inside the fuel cell if the average value of the unit cell voltages monitored by the monitoring unit is lower than or equal to a preset first reference unit voltage, or if the unit cell voltage that is higher than or equal to a preset second reference unit voltage among the unit cell voltages monitored by the monitoring unit is lower than or equal to a preset ratio.

In the condensation judgment unit, it is possible to determine whether condensation has accumulated inside the fuel cell based on the monitored unit cell voltage or the output voltage of the fuel cell when the amount of air supplied to the fuel cell is below a preset flow rate.

In the air supply control unit, if the slope judgment unit determines that the driving road has a slope higher than a preset slope, the amount of air supplied to the fuel cell can be controlled to be less than a preset flow rate.

The device further includes a charge management unit that monitors the charge amount of a high-voltage battery connected to a fuel cell to charge or discharge electricity; and, in the air supply control unit, if the charge amount of the high-voltage battery monitored by the charge management unit is equal to or higher than a preset SOC, the ratio between the air supply amount and the required air amount required for power generation of the fuel cell can be increased.

A charge management unit that monitors the charge amount of a high-voltage battery connected to a fuel cell to charge or discharge electricity; and a power generation control unit that controls to increase the generated power of the fuel cell if the charge amount of the high-voltage battery monitored by the charge management unit is less than a preset SOC; further comprising: an air supply control unit that can increase the air supply amount to be supplied to the fuel cell according to the increased generated power of the fuel cell.

In the air supply control unit, when the amount of air supplied to the fuel cell is increased, the pressure at the air electrode of the fuel cell can be reduced.

The present invention further includes a cooling control unit that sets a target temperature of the fuel cell and controls the temperature of the fuel cell based on the set target temperature, wherein the cooling control unit can increase the target temperature of the fuel cell when the condensate determination unit determines that condensate has accumulated inside the fuel cell.

In order to achieve the above object, a method for controlling driving of a fuel cell vehicle according to the present invention includes: a step of determining whether a gradient of a driving road is equal to or greater than a preset gradient; a step of determining whether condensate has accumulated inside a fuel cell based on an output voltage of the fuel cell or voltages of a plurality of unit cells included in the fuel cell if the driving road has a gradient equal to or greater than the preset gradient; and a step of increasing an amount of air supplied to the fuel cell if it is determined that condensate has accumulated.

In the step of determining whether condensation has accumulated, it can be determined that condensation has accumulated inside the fuel cell if the output voltage of the fuel cell monitored by the monitoring unit is lower than the preset reference voltage.

In the step of determining whether condensate has accumulated, it is possible to determine whether condensate has accumulated inside the fuel cell based on the monitored unit cell voltage or the output voltage of the fuel cell while the amount of air supplied to the fuel cell is below a preset flow rate.

The method further includes a step of determining whether the charge amount of the high-voltage battery is greater than or equal to a preset SOC prior to the step of increasing the amount of air supplied to the fuel cell; and in the step of increasing the amount of air supplied, if the charge amount of the high-voltage battery is greater than or equal to the preset SOC, the ratio between the amount of air supplied and the amount of air required for power generation of the fuel cell can be increased.

The method further includes a step of determining whether the charge amount of the high-voltage battery is greater than or equal to a preset SOC prior to the step of increasing the air supply amount supplied to the fuel cell; and in the step of increasing the air supply amount, if the charge amount of the high-voltage battery is less than the preset SOC, the power generation of the fuel cell can be controlled to increase.

After the step of increasing the air supply amount, the method may further include a step of determining whether condensate has accumulated inside the fuel cell based on the output voltage of the fuel cell or the voltages of a plurality of unit cells included in the fuel cell; and a step of increasing the target temperature of the fuel cell, which controls the temperature of the fuel cell, when it is determined that condensate has accumulated.

According to the driving control system and control method of the fuel cell vehicle of the present invention, the performance of the fuel cell can be restored by discharging condensate accumulated inside the fuel cell to the outside while driving on a slope.

Figure 1 illustrates a driving control system of a fuel cell vehicle (10) according to one embodiment of the present invention.
Figure 2 illustrates a state in which condensate accumulates in a fuel cell (10) according to one embodiment of the present invention.
Figure 3 is a flow chart of a driving control method of a fuel cell vehicle (10) according to one embodiment of the present invention.

Specific structural and functional descriptions of the embodiments of the present invention disclosed in this specification or application are merely illustrative for the purpose of explaining embodiments according to the present invention, and the embodiments according to the present invention may be implemented in various forms and should not be construed as limited to the embodiments described in this specification or application.

Since the embodiments according to the present invention can have various changes and can have various forms, specific embodiments are illustrated in the drawings and described in detail in this specification or application. However, this is not intended to limit the embodiments according to the concept of the present invention to specific disclosed forms, but should be understood to include all modifications, equivalents, or substitutes included in the spirit and technical scope of the present invention.

The terms first and/or second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are only intended to distinguish one component from another, for example, without departing from the scope of the invention, a first component may be referred to as a second component, and similarly, a second component may also be referred to as a first component.

When it is said that an element is "connected" or "connected" to another element, it should be understood that it may be directly connected or connected to that other element, but that there may be other elements in between. On the other hand, when it is said that an element is "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between. Other expressions that describe the relationship between elements, such as "between" and "directly between" or "adjacent to" and "directly adjacent to", should be interpreted similarly.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. It should be understood that, as used herein, the terms "comprises" or "has" and the like are intended to specify the presence of a described feature, number, step, operation, component, part, or combination thereof, but do not exclude in advance the presence or possibility of adding one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms defined in commonly used dictionaries, such as those defined in common usage, should be interpreted as having a meaning consistent with the meaning they have in the context of the relevant art, and shall not be interpreted in an idealized or overly formal sense unless explicitly defined herein.

Hereinafter, the present invention will be described in detail by describing preferred embodiments of the present invention with reference to the attached drawings. The same reference numerals presented in each drawing represent the same components.

FIG. 1 illustrates a driving control system of a fuel cell vehicle (10) according to one embodiment of the present invention, and FIG. 2 illustrates a state in which condensate accumulates in a fuel cell (10) according to one embodiment of the present invention.

Referring to FIGS. 1 and 2, a driving control system of a fuel cell vehicle (10) according to one embodiment of the present invention comprises: a fuel cell (10) that generates electricity by receiving hydrogen and air respectively; a monitoring unit (20) that monitors a plurality of unit cells included in the fuel cell (10) or an output voltage of the fuel cell (10); a gradient determination unit (30) that determines whether a gradient of a driving road is equal to or greater than a preset gradient; a condensation determination unit (40) that determines whether condensate has accumulated inside the fuel cell (10) based on the unit cell voltage monitored by the monitoring unit (20) or the output voltage of the fuel cell (10) when the gradient determination unit determines that the driving road is equal to or greater than the preset gradient; and an air supply control unit (50) that increases the amount of air supplied to the fuel cell (10) when the condensate determination unit (40) determines that condensate has accumulated inside the fuel cell (10).

The fuel cell (10) can receive hydrogen from a hydrogen supply system and air from an air supply system, and cause a chemical reaction between hydrogen and oxygen in the air inside. Electricity can be generated by the chemical reaction occurring inside the fuel cell (10).

The fuel cell (10) may refer to a fuel cell (10) stack formed by stacking multiple unit cells. The fuel cell (10) forms current and voltage by connecting multiple stacked unit cells, and may supply power by connecting to a driving system (motor) or auxiliary equipment.

The monitoring unit (20) can measure the individual voltages of multiple unit cells included in the fuel cell (10) or the output voltage of the entire fuel cell (10). The monitoring unit (20) can be an SVM (Stack Voltage Monitor) that continuously monitors the voltages of individual cells included in the fuel cell (10).

The slope judgment unit (30) can determine whether the slope of the road on which the vehicle is driving or is expected to drive is equal to or greater than a preset slope. Specifically, the road can be the road on which the vehicle is currently driving or the road on which the vehicle is expected to drive after a preset time or distance.

As shown in Fig. 2, if a vehicle tilts due to the slope of the road while driving, the generated water inside the fuel cell (10) may not be discharged and may accumulate in a condensed state.

In particular, this phenomenon frequently occurs on the cathode side of the fuel cell (10) where the reaction of hydrogen and oxygen occurs, and there was a problem that the unit cell could not sufficiently form voltage in the area where condensate accumulated, thereby deteriorating the performance of the fuel cell (10).

The condensation judgment unit (40) can determine whether condensation has accumulated inside the fuel cell (10) based on the unit cell voltage or the output voltage of the fuel cell (10).

The air supply control unit (50) can control the flow rate or pressure of air supplied to the fuel cell (10). In particular, the air supply control unit (50) can increase the amount of air supplied to the fuel cell (10) when it is determined that condensate has accumulated inside the fuel cell (10).

Specifically, the air supply system for supplying air to the fuel cell (10) may include an air supply line (51) through which air flows, an air blower or air compressor (52) provided at the inlet side of the air supply line (51) to flow air, a pressure control valve (53) provided at the inlet side of the air supply line (51) to control the pressure of the air supply line (51) as the opening is adjusted, etc. The air supply control unit (50) can control the air supply amount or the air electrode pressure by controlling the rotational speed of the air blower or air compressor (52) or the opening of the pressure control valve (53).

Accordingly, the amount of air supplied to the fuel cell (10) is increased, thereby having the effect of restoring the performance of the fuel cell (10) by discharging the condensate accumulated inside the fuel cell (10) to the outside. In particular, the condensate accumulated at the air electrode of the fuel cell (10) can be discharged to the outside.

In one embodiment, the system further includes a gyro sensor (31) that senses a change in the inclination of the vehicle, and the inclination determination unit (30) can determine whether the inclination of the driving road is greater than a preset inclination based on the change in the inclination of the vehicle sensed by the gyro sensor (31).

The gyro sensor (31) can sense the longitudinal angular velocity of the vehicle, and by integrating the sensed angular velocity of the vehicle, the gradient of the road on which the vehicle is driving can be calculated. The gradient determination unit (30) can compare the gradient of the road calculated by integrating the change in inclination of the vehicle sensed by the gyro sensor (31) with a preset gradient.

Alternatively, the slope judgment unit (30) can directly compare the change in the vehicle's slope sensed by the gyro sensor (31) with a preset slope change to determine whether the slope of the driving road is higher than the preset slope.

In another embodiment, the vehicle further includes an atmospheric pressure sensor (32) that senses atmospheric pressure outside the vehicle, and the slope determination unit (30) can determine whether the slope of the driving road is greater than a preset slope based on the atmospheric pressure sensed by the atmospheric pressure sensor (32).

The atmospheric pressure sensor (32) is a pressure sensor that measures the atmospheric pressure outside the vehicle, and can determine the gradient of the driving road by using the law that the atmospheric pressure decreases as the altitude increases from sea level.

The slope judgment unit (30) calculates the slope of the driving road based on the rate of change in atmospheric pressure sensed by the atmospheric pressure sensor (32), and can compare the calculated slope of the driving road with a preset slope.

Alternatively, the atmospheric pressure sensed by the atmospheric pressure sensor (32) can be differentiated or the rate of change over a preset period of time can be calculated and directly compared with the preset rate of change in atmospheric pressure to determine whether the gradient of the driving road is greater than or equal to the preset gradient.

In another embodiment, the slope determination unit (30) can receive the slope of the driving road from the navigation (33).

Specifically, the navigation (33) may be based on map information stored in the memory of the vehicle and the destination setting of the vehicle, or may be information transmitted through a communication network. The navigation (33) may receive GPS information of the vehicle and use map information of the road on which the vehicle is driving to determine the gradient of the road.

The gradient of the driving road according to the navigation (33) can be input not only for the road on which the vehicle is currently driving, but also for the gradient of the road on which the vehicle is expected to drive.

Here, the preset slope, preset slope change, and preset atmospheric pressure change rate can be experimentally preset as a slope at which condensate is likely to accumulate inside the fuel cell (10).

As an example, the condensation determination unit (40) may determine that condensation has accumulated inside the fuel cell (10) when the output voltage of the fuel cell (10) monitored by the monitoring unit (20) is lower than a preset reference voltage.

The condensation judgment unit (40) can determine whether condensation has accumulated inside the fuel cell (10) by determining whether the overall output voltage of the fuel cell (10) has deteriorated below a preset reference voltage.

Here, the preset reference voltage can be preset for each output current of the fuel cell (10), and the reference voltage can be preset to decrease as the output current of the fuel cell (10) increases.

In another embodiment, the condensate determination unit (40) may determine that condensate has accumulated inside the fuel cell (10) when the average value of the unit cell voltages monitored by the monitoring unit (20) is lower than or equal to a preset first reference unit voltage, or when the unit cell voltage that is higher than or equal to a preset second reference unit voltage among the unit cell voltages monitored by the monitoring unit (20) is lower than or equal to a preset ratio.

Specifically, the monitoring unit (20) monitors the unit cell voltage, and the condensate determination unit (40) calculates the average value of the monitored unit cell voltage to determine whether it is lower than or equal to a preset first reference unit voltage. The preset first reference unit voltage can be preset for each output current of the fuel cell (10), and the reference voltage can be preset to decrease as the output current of the fuel cell (10) increases.

In addition, the monitoring unit (20) can monitor the unit cell voltage, and the condensate judgment unit (40) can determine whether the unit cell voltage that is higher than the preset second reference unit voltage among the monitored unit cell voltages is lower than the preset ratio.

If condensate accumulates in some of the unit cells, normal power generation may not be possible in some of the unit cells where condensate has accumulated, and the cell voltage may decrease.

In the condensation judgment unit (40), it can be determined that condensation has accumulated inside the fuel cell (10) when the unit cell voltage that is higher than the preset second reference unit voltage among the unit cell voltages increases and the preset ratio is lower than or equal to the preset second reference unit voltage. The second reference unit voltage can be preset to be lower than or equal to the first reference unit voltage, and the preset ratio can be preset to, for example, 70%.

In another embodiment, the condensation determination unit (40) can determine whether condensation has accumulated inside the fuel cell (10) by using the standard deviation or dispersion of the unit cell voltage monitored by the monitoring unit (20).

In the condensation judgment unit (40), it is possible to determine whether condensation has accumulated inside the fuel cell (10) based on the monitored unit cell voltage or the output voltage of the fuel cell (10) when the amount of air supplied to the fuel cell (10) is below a preset flow rate.

Specifically, it is possible to determine whether condensate has accumulated inside the fuel cell (10) based on the monitored unit cell voltage or the output voltage of the fuel cell (10) in a low-flow operation state in which the fuel cell (10) is controlled to enter the FC Stop mode in which power generation is stopped, so that the amount of air supplied to the fuel cell (10) becomes 0 or the amount of air supplied to the fuel cell (10) is less than a preset amount of air.

When the amount of air supplied to the fuel cell (10) is relatively large or the power load of the fuel cell (10) is relatively large, the output voltage or unit cell voltage of the fuel cell (10) varies, making it difficult to determine the accumulation of condensate inside the fuel cell (10).

Accordingly, the accuracy of determining whether condensate has accumulated can be improved by determining whether condensate has accumulated inside the fuel cell (10) in a state where the output current of the fuel cell (10) is relatively low while the air supplied to the fuel cell (10) is blocked or supplied at a low flow rate.

In another embodiment, the air supply control unit (50) can control the amount of air supplied to the fuel cell (10) to be less than or equal to a preset flow rate when the slope determination unit determines that the driving road has a preset slope or higher.

The air supply control unit (50) can temporarily control the air supply amount to a preset amount or less in order to determine whether condensate has accumulated. In particular, the air supply control unit (50) can control the fuel cell (10) to stop power generation for a short period of time (FC Stop mode) by controlling the air supply to be cut off.

In addition, the device further includes a charge management unit (60) that monitors the charge amount of a high-voltage battery (61) that is connected to a fuel cell (10) to charge or discharge electricity; and, in the air supply control unit (50), if the charge amount of the high-voltage battery (61) monitored by the charge management unit (60) is equal to or higher than a preset SOC, the ratio between the air supply amount and the required air amount required for power generation of the fuel cell (10) can be increased.

The high-voltage battery (61) can assist the power supply of the fuel cell (10) by being charged with power output from the fuel cell (10) or by discharging when the output power of the fuel cell (10) is insufficient.

The charge management unit (60) can monitor the charge amount (SOC: State Of Charge), which is the amount of power charged to the high-voltage battery (61). The charge management unit (60) can control to charge the high-voltage battery (61) when the charge amount of the monitored high-voltage battery (61) is insufficient, and can control to discharge the high-voltage battery (61) when the charge amount of the monitored high-voltage battery (61) is sufficient.

In the air supply control unit (50), if the charge amount of the high-voltage battery (61) is greater than a preset SOC, the ratio (SR: Stoichiometric Ratio) between the air supply amount and the required air amount required for power generation of the fuel cell (10) can be increased.

In general, the air supply control unit (50) can supply a relatively large amount of air to the fuel cell (10) compared to the amount of air required for power generation of the fuel cell (10). The ratio between the amount of air supplied and the amount of air required is the SR Ratio, and the SR Ration can vary depending on the operating status of the fuel cell (10).

If the charge amount of the high-voltage battery (61) is higher than the preset SOC, it can be determined that it is not sufficient to charge the high-voltage battery (61), and the air supply control unit (50) can discharge the condensate accumulated inside the fuel cell (10) by simply increasing the air supply amount.

If the charge of the high-voltage battery (61) monitored by the charge management unit (60) is less than a preset SOC, the system further includes a power generation control unit (70) that controls the power generation of the fuel cell (10) to increase, and the air supply control unit (50) can increase the amount of air supplied to the fuel cell (10) according to the increased power generation of the fuel cell (10).

The power generation control unit (70) calculates the power supply load of the fuel cell (10) based on the power consumption of the drive system or auxiliary equipment, and can control the power generation of the fuel cell (10) according to the calculated power supply load. Specifically, when the power generation control unit (70) increases the power generation of the fuel cell (10), the air supply control unit (50) can increase the air supply amount according to the increased power generation of the fuel cell (10).

The power generation control unit (70) can increase the generated power of the fuel cell (10) to charge the high-voltage battery (61) with the power generated from the fuel cell (10) if the charge amount of the monitored high-voltage battery (61) is less than the preset SOC.

In the air supply control unit (50), the amount of air supplied can be increased to the fuel cell (10) by controlling the amount of air supplied according to the increased power generation of the fuel cell (10), if it is determined that condensate has accumulated inside the fuel cell (10).

Additionally, in the air supply control unit (50), when the amount of air supplied to the fuel cell (10) is increased, the air electrode pressure of the fuel cell (10) can be reduced.

By increasing the rotation speed of the air blower or compressor of the air supply line (51) to increase the air supply amount, the air supply line (51) and the air electrode pressure of the fuel cell (10) can be increased. Accordingly, the air supply control unit (50) can increase the air supply amount and at the same time reduce the air electrode pressure of the fuel cell (10).

Specifically, the air supply control unit (50) can reduce the air electrode pressure of the fuel cell (10) by controlling the opening degree to open the pressure regulating valve provided on the outlet side of the air supply line (51).

Accordingly, as the pressure of the air electrode of the fuel cell (10) increases, the condensate moving to the hydrogen electrode of the fuel cell (10) is reduced, and the problem of condensate accumulating at the hydrogen electrode of the fuel cell (10) can be prevented.

In addition, the system further includes a cooling control unit that sets a target temperature of the fuel cell (10) and controls the temperature of the fuel cell (10) based on the set target temperature; and in the cooling control unit, when the condensate determination unit (40) determines that condensate has accumulated inside the fuel cell (10), the target temperature of the fuel cell (10) can be increased.

The cooling control unit can control the temperature of the fuel cell (10) by controlling the cooling system of the fuel cell (10). Specifically, the cooling system can include a cooling water line through which cooling water flows, a cooling pump that flows the cooling water in the cooling water line, a radiator, a cooling fan, etc. The cooling control unit can control the temperature of the fuel cell (10) to follow the target temperature by controlling the cooling pump, the cooling fan, etc.

When the cooling control unit determines that condensate has accumulated inside the fuel cell (10), it can increase the target temperature of the fuel cell (10). Accordingly, it has the effect of eliminating the accumulation of condensate occurring not only in the air electrode of the fuel cell (10) but also in the hydrogen electrode.

That is, as the temperature of the fuel cell (10) increases, the generated water inside the fuel cell (10) may not be condensed but may be discharged to the outside in a gaseous state, or the condensed water accumulated inside may be vaporized and discharged to the outside.

In particular, the condensation determination unit (40) can determine again whether condensation has accumulated inside the fuel cell (10) after increasing the amount of air supplied to the fuel cell (10) from the air supply control unit (50), and if it is determined that condensation has accumulated inside the fuel cell (10) even after increasing the amount of air supplied to the fuel cell (10) from the air supply control unit (50), the cooling control unit can control the target temperature of the fuel cell (10) to increase.

The monitoring unit (20), the slope determination unit (30), the condensate determination unit (40), the air supply control unit (50), the charge management unit (60), and the power generation control unit (70) according to an exemplary embodiment of the present invention may be a part of the ECU or FCU or a separate controller connected thereto.

A controller according to an exemplary embodiment of the present invention may be implemented via a nonvolatile memory (not shown) configured to store data relating to an algorithm configured to control the operation of various components of a vehicle or software instructions for reproducing said algorithm, and a processor (not shown) configured to perform the operations described below using the data stored in the memory. Here, the memory and the processor may be implemented as separate chips. Alternatively, the memory and the processor may be implemented as a single chip integrated with each other. The processor may take the form of one or more processors.

Figure 3 is a flow chart of a driving control method of a fuel cell vehicle (10) according to one embodiment of the present invention.

Referring further to FIG. 3, a driving control method of a fuel cell vehicle (10) according to an embodiment of the present invention includes a step (S100) of determining whether a gradient of a driving road is greater than or equal to a preset gradient; a step (S300) of determining whether condensate has accumulated inside a fuel cell (10) based on an output voltage of the fuel cell (10) or voltages of a plurality of unit cells included in the fuel cell (10) if the driving road is greater than or equal to the preset gradient; and a step (S500) of increasing the amount of air supplied to the fuel cell (10) if it is determined that condensate has accumulated.

In the step (S300) of determining whether condensate has accumulated, it can be determined that condensate has accumulated inside the fuel cell (10) if the output voltage of the fuel cell (10) monitored by the monitoring unit (20) is lower than a preset reference voltage.

In particular, before the step (S300) of determining whether condensate has accumulated, a step (S200) of determining whether the fuel cell (10) has entered the FC Stop mode that stops power generation is further included, and it is possible to determine whether condensate has accumulated while the fuel cell (10) has entered the FC Stop mode.

In the step (S300) of determining whether condensate has accumulated, it is possible to determine whether condensate has accumulated inside the fuel cell (10) based on the monitored unit cell voltage or the output voltage of the fuel cell (10) while the amount of air supplied to the fuel cell (10) is below a preset flow rate.

Before the step (S500) of increasing the amount of air supplied to the fuel cell (10), a step (S400) of determining whether the amount of charge of the high-voltage battery (61) is greater than or equal to a preset SOC is further included, and in the step (S500) of increasing the amount of air supplied, if the amount of charge of the high-voltage battery (61) is greater than or equal to the preset SOC, the ratio between the amount of air supplied and the amount of air required for power generation of the fuel cell (10) can be increased (S520).

Before the step of increasing the amount of air supplied to the fuel cell (10), a step of determining whether the amount of charge of the high-voltage battery (61) is greater than or equal to a preset SOC is further included; and in the step of increasing the amount of air supplied (S500), if the amount of charge of the high-voltage battery (61) is less than the preset SOC, the power generation of the fuel cell (10) can be controlled to increase (S510).

After the step of increasing the air supply amount (S500), the method may further include a step of determining whether condensate has accumulated inside the fuel cell (10) based on the output voltage of the fuel cell (10) or the voltages of a plurality of unit cells included in the fuel cell (10) (S700); and a step of increasing the target temperature of the fuel cell (10) by controlling the temperature of the fuel cell (10) when it is determined that condensate has accumulated (S800).

Before the step (S700) of determining whether condensate has accumulated, a step (S600) of determining whether the fuel cell (10) has entered the FC Stop mode that stops power generation is further included, and it is possible to determine whether condensate has accumulated while the fuel cell (10) has entered the FC Stop mode.

While the present invention has been illustrated and described with respect to specific embodiments thereof, it will be apparent to those skilled in the art that the present invention may be variously improved and modified without departing from the technical spirit of the invention as defined by the following claims.

10: Fuel cell 20: Monitoring unit
30: Slope judgment section 40: Condensation judgment section
50: Air supply control unit 60: Charge management unit
70: Power generation control unit

Claims (18)

Fuel cells that generate electricity by receiving hydrogen and air respectively;
A monitoring unit that monitors the output voltage of a plurality of unit cells or fuel cells included in a fuel cell;
A slope judgment unit that judges whether the slope of the driving road is greater than a preset slope;
When the slope judgment unit determines that the driving road has a slope higher than the preset slope, a condensation judgment unit that determines whether condensation has accumulated inside the fuel cell based on the unit cell voltage monitored by the monitoring unit or the output voltage of the fuel cell; and
An air supply control unit that increases the amount of air supplied to the fuel cell when the condensate judgment unit determines that condensate has accumulated inside the fuel cell;
A fuel cell vehicle driving control system characterized in that the condensation judgment unit determines whether condensation has accumulated inside the fuel cell based on the monitored unit cell voltage or the output voltage of the fuel cell when the amount of air supplied to the fuel cell is below a preset flow rate. In claim 1,
Further comprising a gyro sensor for sensing changes in the vehicle's inclination;
A fuel cell vehicle driving control system characterized in that the gradient judgment unit determines whether the gradient of the driving road is greater than or equal to a preset gradient based on the change in the gradient of the vehicle sensed by the gyro sensor. In claim 1,
Further comprising an atmospheric pressure sensor for sensing atmospheric pressure outside the vehicle;
A fuel cell vehicle driving control system characterized in that the gradient judgment unit determines whether the gradient of the driving road is greater than a preset gradient based on the atmospheric pressure sensed by the atmospheric pressure sensor. In claim 1,
A fuel cell vehicle driving control system characterized in that the gradient judgment unit receives the gradient of the driving road from the navigation system. In claim 1,
A driving control system for a fuel cell vehicle, characterized in that the condensation judgment unit determines that condensation has accumulated inside the fuel cell when the output voltage of the fuel cell monitored by the monitoring unit is lower than a preset reference voltage. In claim 1,
A fuel cell vehicle driving control system characterized in that the condensation judgment unit determines that condensation has accumulated inside the fuel cell when the average value of the unit cell voltages monitored by the monitoring unit is lower than or equal to a preset first reference unit voltage, or when the unit cell voltage higher than or equal to a preset second reference unit voltage among the unit cell voltages monitored by the monitoring unit is lower than or equal to a preset ratio. delete In claim 1,
A fuel cell vehicle driving control system characterized in that, in an air supply control unit, the amount of air supplied to the fuel cell is controlled to be less than a preset amount of air when the slope judgment unit determines that the driving road has a preset slope or higher. Fuel cells that generate electricity by receiving hydrogen and air respectively;
A monitoring unit that monitors the output voltage of a plurality of unit cells or fuel cells included in a fuel cell;
A slope judgment unit that judges whether the slope of the driving road is greater than a preset slope;
A condensation judgment unit that determines whether condensate has accumulated inside the fuel cell based on the unit cell voltage monitored by the monitoring unit or the output voltage of the fuel cell when the slope judgment unit determines that the driving road has a slope higher than a preset slope;
An air supply control unit that increases the amount of air supplied to the fuel cell when the condensate judgment unit determines that condensate has accumulated inside the fuel cell; and
Includes a charge management unit that monitors the charge amount of a high-voltage battery that is connected to a fuel cell and charges or discharges electricity;
A fuel cell vehicle driving control system characterized in that, in an air supply control unit, if the charge amount of the high-voltage battery monitored by the charge amount management unit is greater than a preset SOC, the ratio between the air supply amount and the required air amount required for power generation of the fuel cell is increased. Fuel cells that generate electricity by receiving hydrogen and air respectively;
A monitoring unit that monitors the output voltage of a plurality of unit cells or fuel cells included in a fuel cell;
A slope judgment unit that judges whether the slope of the driving road is greater than a preset slope;
When the slope judgment unit determines that the driving road has a slope higher than a preset slope, a condensation judgment unit determines whether condensation has accumulated inside the fuel cell based on the unit cell voltage monitored by the monitoring unit or the output voltage of the fuel cell;
An air supply control unit that increases the amount of air supplied to the fuel cell when the condensate judgment unit determines that condensate has accumulated inside the fuel cell;
A charge management unit that monitors the charge amount of a high-voltage battery that is connected to a fuel cell and charges or discharges electricity; and
It includes a power generation control unit that controls the fuel cell to increase its power generation when the charge of the high-voltage battery monitored by the charge management unit is below a preset SOC;
A fuel cell vehicle driving control system characterized in that the air supply control unit increases the amount of air supplied to the fuel cell according to the increased power generation of the fuel cell. Fuel cells that generate electricity by receiving hydrogen and air respectively;
A monitoring unit that monitors the output voltage of a plurality of unit cells or fuel cells included in a fuel cell;
A slope judgment unit that judges whether the slope of the driving road is greater than a preset slope;
When the slope judgment unit determines that the driving road has a slope higher than the preset slope, a condensation judgment unit that determines whether condensation has accumulated inside the fuel cell based on the unit cell voltage monitored by the monitoring unit or the output voltage of the fuel cell; and
An air supply control unit that increases the amount of air supplied to the fuel cell when the condensate judgment unit determines that condensate has accumulated inside the fuel cell;
A fuel cell vehicle driving control system characterized in that, in an air supply control unit, when the amount of air supplied to the fuel cell is increased, the pressure of the air electrode of the fuel cell is reduced. In claim 1,
Further comprising a cooling control unit that sets a target temperature of the fuel cell and controls the temperature of the fuel cell based on the set target temperature;
A fuel cell vehicle driving control system characterized in that, in a cooling control unit, when a condensate judgment unit determines that condensate has accumulated inside the fuel cell, the target temperature of the fuel cell is increased. A step for determining whether the gradient of the driving road is greater than a preset gradient;
A step of determining whether condensate has accumulated inside the fuel cell based on the output voltage of the fuel cell or the voltage of multiple unit cells included in the fuel cell when the driving road has a predetermined gradient or higher; and
Including a step of increasing the amount of air supplied to the fuel cell when it is determined that condensate has accumulated;
A method for controlling operation of a fuel cell vehicle, characterized in that in the step of determining whether condensate has accumulated, it is determined whether condensate has accumulated inside the fuel cell based on the monitored unit cell voltage or the output voltage of the fuel cell while the amount of air supplied to the fuel cell is below a preset flow rate. In claim 13,
A method for controlling driving of a fuel cell vehicle, characterized in that in a step of determining whether condensate has accumulated, it is determined that condensate has accumulated inside the fuel cell if the output voltage of the fuel cell monitored by the monitoring unit is lower than a preset reference voltage. delete A step for determining whether the gradient of the driving road is greater than a preset gradient;
A step of determining whether condensate has accumulated inside the fuel cell based on the output voltage of the fuel cell or the voltage of multiple unit cells included in the fuel cell when the driving road has a preset gradient or higher;
When it is determined that condensate has accumulated, a step of increasing the amount of air supplied to the fuel cell; and
Before the step of increasing the amount of air supplied to the fuel cell, the step of determining whether the charge amount of the high-voltage battery is greater than a preset SOC is further included;
A method for controlling driving of a fuel cell vehicle, characterized in that, in a step of increasing the air supply amount, if the charge amount of the high-voltage battery is greater than a preset SOC, the ratio between the air supply amount and the required air amount required for power generation of the fuel cell is increased. A step for determining whether the gradient of the driving road is greater than a preset gradient;
A step of determining whether condensate has accumulated inside the fuel cell based on the output voltage of the fuel cell or the voltage of multiple unit cells included in the fuel cell when the driving road has a preset gradient or higher;
When it is determined that condensate has accumulated, a step of increasing the amount of air supplied to the fuel cell; and
Before the step of increasing the amount of air supplied to the fuel cell, the step of determining whether the charge amount of the high-voltage battery is greater than a preset SOC is further included;
A method for controlling operation of a fuel cell vehicle, characterized in that, in a step of increasing the air supply, if the charge amount of the high-voltage battery is less than a preset SOC, the generated power of the fuel cell is controlled to increase. In claim 13,
After the step of increasing the air supply, a step of determining whether condensate has accumulated inside the fuel cell based on the output voltage of the fuel cell or the voltage of a plurality of unit cells included in the fuel cell; and
A method for controlling driving of a fuel cell vehicle, characterized in that it further includes a step of controlling the temperature of the fuel cell by raising the target temperature of the fuel cell when it is determined that condensate has accumulated.

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