JP3882530B2 - Control device for fuel cell system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a control device for a fuel cell system, and more particularly to a control device for a fuel cell system with improved warm-up performance.
[0002]
[Prior art]
A fuel cell generates electric power by electrochemically reacting a fuel gas such as hydrogen and an oxidizing gas containing oxygen through an electrolyte membrane, and the power that can be generated is supplied fuel gas and oxidizing gas. Varies depending on the pressure and flow rate.
[0003]
The characteristics of each fuel cell are usually different, but the generated current of the fuel cell is proportional to the chemical equivalent of the gas that reacts per unit time. For this reason, as a general tendency, the larger the generated power, the more the pressure and flow rate of the supplied fuel gas and oxidizing gas are increased.
[0004]
Therefore, for example, in the technique described in Japanese Patent Application Laid-Open No. 7-75214, the actual gas state as a result of setting the gas supply target amount according to the target generated power of the fuel cell and further controlling according to the target. Accordingly, it is disclosed that the upper limit power taken out from the fuel cell is calculated, and the generated power can be actually limited. At the same time, the publication discloses that the upper limit of the generated power is limited even in accordance with the temperature of the fuel cell. In other words, the power generation amount of the fuel cell is limited by the power generation amount limit value which is smaller of the power generation amount limit value retrieved from the fuel cell temperature in the table and the aforementioned power generation amount limit value obtained from the actual gas flow rate. .
[0005]
[Problems to be solved by the invention]
However, in the above-described conventional technology, the power generated is limited by using the temperature of the fuel cell as a parameter. Therefore, when the fuel cell is at a low temperature, the power that can be generated is suppressed more than usual. Heat generation that raises the temperature is also suppressed, and there is a problem that the warm-up time of the fuel cell becomes longer.
[0006]
The present invention has been made in view of the above-mentioned problems, and at the time of cold start of the fuel cell, it prevents a decrease in the voltage of each cell and reduces the limit of the generated power of the fuel cell as much as possible, thereby reducing the warm-up time. It is an object of the present invention to provide a control device for a fuel cell system that can be shortened.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 is a fuel cell body that is supplied with fuel gas on one side of the electrolyte membrane and oxidant gas on the other side and supplies electric power to a load, and the fuel cell body. A fuel gas supply means for supplying a fuel gas of a desired pressure or a desired flow rate, or both, an oxidizing gas supply means for supplying a desired pressure or a desired flow rate, or both oxidizing gases to the fuel cell body, A fuel cell temperature control means for controlling the temperature of the fuel cell main body, and a voltage for detecting a voltage of each cell constituting the fuel cell main body or a voltage of a cell group composed of a plurality of cells connected in series. detecting means and the temperature sensing hand detecting the variation degree determining means for determining the variation degree of each voltage to which the voltage detecting means detects a value related to the temperature of the fuel cell main body And the target flow rate of the fuel gas and the oxidizing gas, the target pressure, or both, according to the value related to the temperature detected by the temperature detection means and the voltage variation determined by the variation determination means And a target correction means for correcting the fuel cell system.
[0010]
In order to achieve the above object, according to a second aspect of the present invention, in the control device for a fuel cell system according to the first aspect , the target correction means has a value related to the temperature detected by the temperature detection means greater than a predetermined value. The gist is that the target pressure and the target flow rate are corrected so as to increase when the voltage is small or when the voltage variation determined by the variation determination means is larger than a predetermined value.
[0011]
According to a third aspect of the present invention, in order to achieve the above object, in the control apparatus for the fuel cell system according to the first or second aspect , an elapsed time after starting which is an elapsed time from the start of starting of the fuel cell system is measured. And a target correction unit that corrects the target flow rate of the fuel gas and the oxidizing gas, the target pressure, or both in accordance with the elapsed time after startup. .
[0012]
In order to achieve the above object, according to a fourth aspect of the present invention, in the control device for a fuel cell system according to the third aspect , the target correction means is configured to reduce the target pressure and the target pressure when the elapsed time after startup is shorter than a predetermined value. The gist is that the target flow rate is corrected to increase.
[0013]
According to a fifth aspect of the present invention, in order to achieve the above object, in the control apparatus for a fuel cell system according to any one of the first to fourth aspects, the generated power detection for detecting the power generated by the fuel cell main body. And the target correction means limits the correction amount of the target pressure and the target flow rate according to the power detected by the generated power detection means.
[0014]
According to a sixth aspect of the present invention, in order to achieve the above object, in the control device for the fuel cell system according to any one of the first to fifth aspects, the fuel gas and the oxidizing gas supplied to the fuel cell body are controlled. A gas state detecting means for detecting a flow rate and a pressure; and a power generating power calculating means for calculating a power that can be generated by the fuel cell main body from the detected flow rates and pressures of the fuel gas and the oxidizing gas, and the target correcting means. The gist is to limit the correction amount of the target pressure and the target flow rate according to the calculated power that can be generated.
[0015]
According to a seventh aspect of the present invention, in order to achieve the above object, in the control device for the fuel cell system according to any one of the first to sixth aspects, the power that can be transferred to and from the fuel cell or the load. Storage means and dischargeable power calculation means for calculating the dischargeable power of the power storage means, the target correction means according to the calculated dischargeable power, the correction amount of the target pressure and target flow rate The gist is to limit the above.
[0016]
According to an eighth aspect of the present invention, in order to achieve the above object, in the control device for the fuel cell system according to any one of the first to seventh aspects, a request for a load to which the generated power of the fuel cell is supplied is provided. The present invention is characterized in that it comprises load demand power detection means for detecting the power to be performed, and the target correction means limits the correction amount of the target pressure and target flow rate according to the detected power demanded by the load.
[0017]
In order to achieve the above object, according to a ninth aspect of the present invention, in the control device for a fuel cell system according to any one of the first to eighth aspects, the variation degree determining means is configured to detect the detected voltage. The gist is to calculate an average value, and perform the determination by comparing the predetermined number with the number of cells or cell groups in which a voltage deviated by a predetermined value or more from the average value is detected.
[0018]
According to a tenth aspect of the present invention, in order to achieve the above object, in the control device for a fuel cell system according to any one of the first to ninth aspects, the variation degree determining means is configured to detect the detected voltage. The gist is to calculate a standard deviation and perform the determination by comparing the standard deviation with a predetermined value.
[0019]
【The invention's effect】
According to the first or second aspect of the invention, the fuel gas is supplied to one side of the electrolyte membrane, the oxidizing gas is supplied to the other side, and the electric power is supplied to the load. A fuel gas supply means for supplying a desired pressure or a desired flow rate, or both, and an oxidizing gas supply means for supplying a desired pressure, a desired flow rate, or both oxidizing gases to the fuel cell body, and A fuel cell temperature control means for controlling the temperature of the fuel cell main body, and a voltage detection for detecting a voltage of each cell constituting the fuel cell main body or a voltage of a cell group composed of a plurality of cells connected in series. means a variation degree determining means for determining the variation degree of each voltage to which the voltage detecting unit detects a temperature detection means for detecting a value related to the temperature of the fuel cell main body The target flow rate and / or the target pressure of the fuel gas and the oxidant gas are corrected according to the value related to the temperature detected by the temperature detection unit and the voltage variation level determined by the variation level determination unit. And a target gas correction means, and a fuel gas or an oxidant gas according to the temperature variation of the fuel cell and the voltage of each cell constituting the fuel cell or the voltage of a cell group in which a plurality of cells are connected in series. As the operating point is corrected optimally by the target flow rate and / or target pressure, the chemical reaction in the fuel cell electrolyte membrane is promoted by increasing the pressure, or the moisture condensed in the fuel cell gas flow path is increased by increasing the flow rate. Emission to the outside of the fuel cell can be promoted, and as a result, a decrease in the amount of power that can be generated by the fuel cell can be minimized.
[0020]
Furthermore, this has the effect that the temperature of the fuel cell can be quickly raised by the heat generated from the fuel cell, and the warm-up can be finished quickly.
[0022]
According to the third or fourth aspect of the invention, in addition to the effect of the first or second aspect of the invention, the startup for measuring the elapsed time after startup, which is the elapsed time from the start of startup of the fuel cell system. A post-elapsed time measurement unit, and the target correction unit corrects the target flow rate of the fuel gas and the oxidizing gas and / or the target pressure according to the post-startup elapsed time. The operating point can be optimally corrected at a low temperature when the elapsed time after the start-up is short, and further stable fuel cell power generation can be achieved.
[0023]
According to the fifth aspect of the invention, in addition to the effects of the first to fourth aspects of the invention, the apparatus further comprises a generated power detection means for detecting the power generated by the fuel cell body, wherein the target correction means is The correction amount of the target pressure and the target flow rate is limited in accordance with the power detected by the generated power detection means, so that the power shortage accompanying the increase in the work amount of the compressor that compresses the air as the oxidizing gas is prevented. be able to.
[0024]
According to the invention described in claim 6 , in addition to the effects of the invention described in claims 1 to 5, the gas state detecting means for detecting the flow rate and pressure of the fuel gas and the oxidizing gas supplied to the fuel cell main body; And a power generating power calculating means for calculating the power that can be generated by the fuel cell main body from the detected flow rate and pressure of the fuel gas and the oxidizing gas, and the target correction means according to the calculated power generating power that can be generated. Thus, the correction amount of the target pressure and the target flow rate is limited, so that it is possible to consider the power that can be generated when preventing the power shortage accompanying the increase in the work amount of the compressor that compresses the air as the oxidizing gas. it can.
[0025]
According to the seventh aspect of the invention, in addition to the effects of the first to sixth aspects of the invention, the power storage means capable of transferring power to the fuel cell or the load, and the power storage means can be discharged. Dischargeable power calculation means for calculating power, and the target correction means limits the correction amount of the target pressure and target flow rate according to the calculated dischargeable power, so as an oxidizing gas The power storage means can be taken into account when preventing a power shortage accompanying an increase in the work of the compressor that compresses the air.
[0026]
According to the invention described in claim 8 , in addition to the effects of the inventions described in claims 1 to 7, load demand power detection means for detecting the power required by the load supplied with the generated power of the fuel cell is provided. And the target correction means limits the correction amount of the target pressure and the target flow rate according to the electric power required by the detected load, so that the work of the compressor that compresses the air as the oxidizing gas It is possible to consider the power required by the load when preventing power shortage due to an increase in quantity.
[0027]
According to the ninth aspect of the invention, in addition to the effects of the first to eighth aspects of the invention, the variation degree determining means calculates an average value of the detected voltages and determines a predetermined value from the average value. Since the determination is made by comparing the number of cells or cell groups in which a voltage more than a value is detected with a predetermined number, it is possible to determine the degree of voltage variation by simple calculation. .
[0028]
According to a tenth aspect of the present invention, in addition to the effects of the first to ninth aspects, the variation degree determining means calculates a standard deviation of the detected voltage, and the standard deviation and the predetermined deviation are calculated. Since the determination is performed by comparison with the value, there is an effect that the degree of variation can be accurately evaluated.
[0029]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a system configuration diagram showing an overall configuration of a fuel cell system to which a fuel cell control device according to the present invention is applied.
[0030]
In the figure, a fuel cell main body 103 includes a fuel gas supply means 101 capable of supplying a fuel gas having an arbitrary flow rate and pressure, and an oxidizing gas supply means 102 capable of supplying an oxidizing gas having an arbitrary flow rate and pressure. Each is supplied with fuel gas and oxidizing gas to generate power. The generated power is supplied to the load 104, but the power generation amount of the fuel cell main body 103 is configured to be controllable by the load 104. Also provided is a fuel cell temperature control means 105 for controlling the temperature of the fuel cell main body 103 to a temperature suitable for power generation. The operation of these devices is controlled by the control device 106.
[0031]
FIG. 2 is a block diagram showing the main configuration of the first embodiment of the control device for the fuel cell system according to the present invention. The part shown in FIG. 2 constitutes a part of the control device 106 of FIG.
[0032]
In FIG. 2, the control device calculates a target gas operation point that includes a standard target flow rate and a standard target pressure (hereinafter abbreviated as standard target flow rate and pressure) of fuel gas and oxidant gas based on the target power generation amount. The point calculation unit 122, the voltage detection unit 124 that detects the voltage of each cell constituting the fuel cell main body or the voltage of a cell group composed of a plurality of cells connected in series, and the variation in the voltage detected by the voltage detection unit 124 Gas control is performed by correcting the standard target flow rate / pressure calculated by the variation degree determination unit 125 and the target gas operating point calculation unit 122 according to the variation degree determined by the variation degree determination unit 125. A target correction unit 121 that outputs a target flow rate and pressure of the system (the fuel gas supply unit 101 and the oxidizing gas supply unit 102 in FIG. 1), and the flow of the fuel gas and the oxidizing gas. Power between the fuel cell main body or the load and the gas state detection unit 128 that detects the pressure and the power generation unit 129 that calculates the power that can be generated based on the flow rate and pressure detected by the gas state detection unit 128 A power storage unit 131 such as a secondary battery or a capacitor capable of transferring and receiving, a dischargeable power calculation unit 132 that calculates power that can be discharged from the power storage unit 131 based on the state of the power storage unit 131, and the load 104 Load power calculation unit 133 that calculates the power to be output, and upper limit power calculation unit 130 that calculates the upper limit power that can be output based on the stack output, the dischargeable power, and the load request power.
[0033]
In addition, the target correction unit 121 includes a correction amount calculation unit 126 that calculates the correction amount of the operating point in accordance with the variation degree determined by the variation degree determination unit 125, and an upper limit for the correction amount calculated by the correction amount calculation unit 126. An operation point correction amount upper limit calculation unit 127 that is limited by the upper limit power from the power calculation unit 130 and a standard target flow rate / pressure calculated by the target gas operation point calculation unit 122 is corrected by the operation point correction amount upper limit calculation unit 127. And a target correction calculation unit 123 that corrects the amount.
[0034]
Next, the target flow rate / pressure correction calculation performed by the control device 106 will be described in detail.
The target gas operation point calculation unit 122 calculates a standard target flow rate and pressure, which are standard target operation points during normal operation. This calculates the standard target flow rate and standard target pressure of hydrogen and air supplied to the fuel cell main body 103 in accordance with the target generated power of the fuel cell main body 103 calculated separately. The standard target flow rate and pressure obtained here are values set in accordance with a state after the warm-up in which the temperature of the fuel cell main body 103 is sufficiently warmed.
[0035]
FIG. 3 shows an example of the standard target gas flow rate with respect to the target generated power, and FIG. 4 shows an example of the standard target gas pressure with respect to the target generated power. These standard target gas flow rate and standard target gas pressure can be calculated by searching a pre-stored characteristic table map as shown in FIGS. 3 and 4 according to the target power generation amount.
[0036]
Now, depending on the size of the fuel cell main body 103, the temperature may not be uniform and may vary from place to place, and the gas distribution may not be uniform. The behavior does not always match, and the voltage of some cells may decrease. Therefore, in the present invention, by detecting the voltage of each cell or the voltage of a group of cells connected in series, a decrease in the chemical reaction in the electrolyte membrane or a decrease in the reaction area due to water clogging is estimated, and the standard target operation is accordingly performed. The purpose is to correct the points (standard target gas flow rate and pressure) and make the cell voltages uniform.
[0037]
The voltage detector 124 detects the voltage of each cell of the fuel cell main body 103 one by one, or detects the voltage of a cell group consisting of a plurality of cells connected in series over the entire fuel cell main body 103, Each voltage value is output to the variation degree determination unit 125. The output value is preferably a digital value having a desired resolution.
[0038]
For example, assuming that the total number of cells constituting the stack of the fuel cell main body 103 is 400, the voltage of 200 cell groups connected in series by two cells may be detected (2 × 200 = 400). Then, the voltage of 40 cell groups (10 × 40 = 400) connected in series by 10 cells or a cell group of 20 × 20 = 400 may be detected.
[0039]
Here, whether to detect the voltage of each single cell, the voltage of a group of cells connected in series, or the number of cells connected in series depends on the stack structure, the gas in the stack. This is a design parameter that is arbitrarily determined according to the structure of the flow path, the structure of the refrigerant flow path of the stack, etc. It is necessary to determine the serial number of cells that can easily detect the presence of accumulated cells based on the voltage value, in other words, the division number of the cell group.
[0040]
The variation degree determination unit 125 inputs the voltage of each cell detected by the voltage detection unit 124 or the voltage of a cell group composed of a plurality of cells connected in series, and determines how much the values vary. As a determination method, an average value of all detection voltages may be calculated, and a determination may be made based on whether or not there are more than a certain number of cells or cell groups that show a voltage that is more than a certain set value away from that value, Alternatively, the standard deviation may be calculated and then determined.
[0041]
The correction amount calculator 126 calculates a target gas flow rate and / or pressure correction amount according to the variation in cell (cell group) voltage. As the fuel cell temperature is lower, the correction amount is calculated in the direction of increasing the target values of the flow rate and pressure, but the calculation may be performed by searching from a table or by multiplying by a certain coefficient. .
[0042]
5 and 6 are diagrams illustrating examples of correction of the target gas flow rate and the target gas pressure with respect to the target generated power, respectively. When the target power generation amount is W1, the operating point in a sufficiently warmed-up state is operated with a target flow rate of Q1 and a target pressure of P1. On the other hand, in a state where the fuel cell is not warmed up, there is a possibility that the moisture in the gas cools and condenses in the fuel cell, or the chemical reaction rate in the electrolyte decreases. Therefore, the target gas flow rate is set to Q1 ′ by correcting the gas flow rate higher than usual so that the condensed water can flow out of the fuel cell or increasing the gas pressure higher than usual so as to improve the chemical reaction rate. By correcting the target gas pressure to P1 ′, it is possible to prevent the above-described problem from occurring. That is, when it is determined that the voltage variation of the cell or the cell group is large, the normal operation points Q1 and P1 are corrected to increase the gas flow rate and pressure to Q1 ′ and P1 ′. It should be noted that the correction of the flow rate and pressure may be performed individually or simultaneously.
[0043]
Now, in such a state where the fuel cell is not warmed up, correction is performed by adding the target value of the gas flow rate and / or pressure to prevent a decrease in the generated power of the fuel cell. In order to increase the flow rate and pressure, it is conceivable that the work amount of the compressor built in the oxidizing gas supply means 102 of FIG. 1 increases and the power consumption of the compressor increases. However, in a mobile body equipped with a fuel cell, there are few cases where electric power is supplied from the outside, that is, it is necessary to set an upper limit for the electric power that can be consumed by the compressor.
[0044]
Therefore, the upper limit power calculation unit 130 requests the stack output (Pst) that is the power that can be generated by the fuel cell calculated by the power generation possible power calculation unit 129 or the load of the fuel cell calculated by the load required power calculation unit 133. In the case where a power storage unit 131 such as a secondary battery or a capacitor is also provided, depending on the state of the dischargeable power (Psec) that can be discharged from the power storage unit 131, The upper limit (Plim) of the power that can be consumed by the compressor is calculated by the equation (1) shown.
[0045]
[Expression 1]
Plim = Pst−Pld + Psec (1)
In this calculation, instead of the electric power (Pst) that can be generated by the fuel cell, a stack actual output that is an electric power actually output by the fuel cell may be used.
[0046]
As another calculation method, the remainder obtained by subtracting the required power (Pld) of the load from the power that can be generated (Pst) may be the power that can be consumed by the compressor, or the dischargeable power that the power storage unit 131 can discharge. (Psec) may be the power that can be consumed by the compressor.
[0047]
In this way, the upper limit of the gas operation point correction is limited, the operation point of the gas to be targeted is corrected by the target correction calculation unit 123, and is sent as a command value to the gas control system.
[0048]
As described above, even when the fuel cell is at a low temperature and the generated power tends to decrease, it is possible to appropriately correct the operating point of the gas and prevent the generated power from decreasing.
[0049]
FIG. 7 is a principal block diagram illustrating a second embodiment of the control device for the fuel cell system according to the present invention. The difference from the first embodiment is that the correction of the target of the gas operation point in the second embodiment is performed in addition to the voltage variation, the temperature of the fuel cell, the elapsed time after the start of the fuel cell system, or This is done by considering both.
[0050]
Therefore, FIG. 7 is different from FIG. 2 showing the first embodiment in that the temperature detector 143 detects the temperature of the fuel cell, and the post-startup elapsed time measurer 144 that measures the elapsed time since the start of the fuel cell. And the correction amount calculation unit 142 performs correction based on the temperature detected by the temperature detection unit 143 and the time measured by the elapsed time measurement after activation 144 in addition to the amount of variation from the variation degree determination unit 125. The amount has been changed to calculate. Since the functions of the other blocks are the same as those of the first embodiment shown in FIG. 2, the same reference numerals are given to the blocks having the same functions, and description thereof is omitted.
[0051]
The post-startup elapsed time measuring unit 144 measures the time since the fuel cell system started up, and outputs the elapsed time to the correction amount calculating unit 142.
[0052]
The correction amount calculation unit 142 inputs the temperature of the fuel cell from the temperature detection unit 143 in addition to the variation degree from the variation degree determination unit 125, the elapsed time after starting the fuel cell system from the post-startup elapsed time measurement unit 144, In accordance with these, a target gas flow rate and / or pressure correction amount is calculated.
[0053]
The correction is performed in such a direction that the target values of the flow rate and pressure increase as the start-up time of the fuel cell system is shorter, the fuel cell temperature is lower, or the cell voltage variation is larger.
[0054]
As the temperature of the fuel cell, the temperature detection unit 143 may be provided in the fuel cell main body 103, and the detected value may be used. Alternatively, the cooling water is circulated as the fuel cell temperature control means 105 in FIG. Alternatively, the temperature of the cooling water may be detected by the temperature detection unit 143 to represent the fuel cell temperature.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram of a fuel cell system to which the present invention is applied.
FIG. 2 is a principal block diagram showing the configuration of the first embodiment of the control apparatus for the fuel cell system according to the present invention.
FIG. 3 is a diagram showing a standard target gas flow rate characteristic in the first embodiment.
FIG. 4 is a diagram showing standard target gas pressure characteristics in the first embodiment.
FIG. 5 is a diagram showing correction of a target gas flow rate in the first embodiment.
FIG. 6 is a diagram showing correction of a target gas pressure in the first embodiment.
FIG. 7 is a principal block diagram showing a configuration of a second embodiment of the control apparatus for the fuel cell system according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 101 Fuel gas supply means 102 Oxidation gas supply means 103 Fuel cell main body 104 Load 105 Fuel cell temperature control means 106 Control apparatus 121 Target correction | amendment part 122 Standard target operating point 123 Target correction | amendment calculation part 124 Voltage detection part 125 Variation condition determination part 126 Correction Amount calculation unit 127 operating point correction amount upper limit calculation unit 128 gas state detection unit 129 power generation possible power calculation unit 130 upper limit power calculation unit 131 power storage unit 132 dischargeable power calculation unit 133 load required power detection unit

Claims (10)

A fuel cell body that is supplied with fuel gas on one side of the electrolyte membrane and oxidant gas on the other side and supplies electric power to a load, and a fuel gas of a desired pressure or a desired flow rate, or both are supplied to the fuel cell body Fuel gas supply means for supplying, oxidizing gas supply means for supplying a desired pressure or a desired flow rate, or both oxidizing gases to the fuel cell main body, and a fuel cell temperature control means for controlling the temperature of the fuel cell main body In a fuel cell system having
Voltage detection means for detecting the voltage of each cell constituting the fuel cell main body or the voltage of a cell group consisting of a plurality of cells connected in series;
A variation degree determination means for determining a variation degree of each voltage detected by the voltage detection means;
Temperature detecting means for detecting a value related to the temperature of the fuel cell body;
The target flow rate and / or the target pressure of the fuel gas and the oxidant gas are corrected according to the value related to the temperature detected by the temperature detection unit and the voltage variation level determined by the variation level determination unit. Target correction means for
A control apparatus for a fuel cell system, comprising: The target correction unit is configured to detect the target pressure and the target when the value related to the temperature detected by the temperature detection unit is smaller than a predetermined value or when the voltage variation determined by the variation determination unit is larger than a predetermined value. control apparatus for a fuel cell system according to claim 1, wherein a is corrected so as to increase the flow rate. A post-startup elapsed time measuring means for measuring a post-startup elapsed time that is an elapsed time from the start of start of the fuel cell system,
3. The fuel according to claim 1, wherein the target correction means corrects a target flow rate and / or a target pressure of the fuel gas and the oxidizing gas according to the elapsed time after the start-up. Battery system control device. 4. The control device for a fuel cell system according to claim 3 , wherein the target correction means corrects the target pressure and the target flow rate to increase when the elapsed time after startup is shorter than a predetermined value. . Provided with generated power detection means for detecting the power generated by the fuel cell body,
The said target correction | amendment means restrict | limits the correction amount of the said target pressure and a target flow according to the electric power which the said generated electric power detection means detected, The any one of Claim 1 thru | or 4 characterized by the above-mentioned. Control device for fuel cell system. Gas state detection means for detecting the flow rate and pressure of fuel gas and oxidizing gas supplied to the fuel cell body;
From the detected flow rates and pressures of the fuel gas and the oxidant gas, the power generation unit calculates electric power that can be generated by the fuel cell main body, and
The target correction means, in response to said computed power generation electric power, the fuel cell according to any one of claims 1 to 5, characterized in that to limit the amount of correction of the target pressure and target flow rate System control unit. Power storage means capable of transferring power to and from the fuel cell or load, and dischargeable power calculation means for calculating the dischargeable power of the power storage means,
The target correction means, in response to said computed dischargeable power, the fuel cell according to any one of claims 1 to 6, characterized in that to limit the amount of correction of the target pressure and target flow rate System control unit. Load demand power detection means for detecting the power required by the load supplied with the power generated by the fuel cell,
The target correction means, according to the power required by the detected load, according to any one of claims 1 to 7, characterized in that to limit the amount of correction of the target pressure and target flow rate Control device for fuel cell system. The variation degree determination means calculates an average value of the detected voltages, and performs the determination by comparing the predetermined number with the number of cells or cell groups in which a voltage separated from the average value by a predetermined value or more is detected. The control device for a fuel cell system according to any one of claims 1 to 8 , wherein the control device is performed. The dispersion degree determining means calculates the standard deviation of the detected voltage, any one of claims 1 to 9, characterized in that the determination by comparison with the standard deviation and a predetermined value The control apparatus of the fuel cell system described.

Images