KR20080044426A - Fuel pump malfunction detecting method and fuel cell system using the same - Google Patents

Abstract

A method for detecting malfunctioning of a fuel pump is provided to monitor the operation of a fuel pump in a simple manner, and to inform a malfunctioning condition of users promptly when the fuel pump is in an abnormal state. A method for detecting malfunctioning of a fuel pump in a controller linked to the fuel pump that conveys fuel supplied from a liquid fuel storing container to a fuel cell for generating electric energy through electrochemical reactions between the fuel and an oxidant, comprises: a step(S10) of measuring the initial fuel amount and the concentration of the fuel stored in the container; a step(S12) of selecting a driving voltage and wave pattern based on the fuel concentration; a step(S14) of measuring the residual amount of fuel remaining in the container after a predetermined period; a step(S16) of calculating the amount of fuel conveyed to the fuel cell through the fuel pump based on the driving voltage, wave pattern and period; a step(S18) of comparing the conveyed fuel amount with the difference between the initial fuel amount and the residual fuel amount, and determining whether the result is in an error range or not; a step(S20) of measuring the voltage applied to the pump from the controller, if the result is away from the error range, and a step(S22) of comparing the measured voltage with the predetermined driving voltage; and a step(S24) of outputting information about the malfunctioning of the fuel pump, if the measured voltage approaches the driving voltage.

Description

Fuel Pump Malfunction Detecting Method and Fuel Cell System using the Same}

1 is a block diagram illustrating a fuel cell system employing a fuel pump malfunction detection method according to an embodiment of the present invention.

2 is a flowchart illustrating a fuel pump malfunction detection method according to an exemplary embodiment of the present invention.

FIG. 3 is an exploded cross-sectional view illustrating a polymer electrolyte fuel cell employable in the fuel cell system of FIG. 1.

Explanation of symbols on the main parts of the drawings

10: fuel storage container 12: level sensor unit

14 concentration sensor unit 20 fuel cell stack

30: fuel pump 40: control device

42: storage device 44: power measuring device

50a, 50b: output device

The present invention relates to a method for easily and accurately detecting malfunction of a fuel pump for a fuel cell and a fuel cell system employing the same.

A fuel cell is a power generation system that directly converts fuel energy into electrical energy, and has advantages of low pollution and high efficiency. In particular, fuel cells are attracting attention as next-generation energy sources because they can generate electrical energy using energy sources such as petroleum energy, natural gas, and methanol, which are easy to store and transport. Such fuel cells may be classified into phosphoric acid fuel cells, molten carbonate fuel cells, solid oxide fuel cells, polymer electrolyte fuel cells, and alkaline fuel cells according to the type of electrolyte used. The batteries operate basically on the same principle, but differ in the type of fuel used, operating temperature, catalyst and electrolyte.

Direct Methanol Fuel Cell (DMFC) uses a polymer membrane that conducts hydrogen ions (proton) as an electrolyte and consists of supplying a liquid methanol aqueous solution directly to the anode as a fuel. DMFC is mainly manufactured in a stack structure in which a plurality of single cells are structurally or electrically connected, and is suitable for portable or small fuel cell structures because it is operated at an operating temperature of less than 100 ° C without using a fuel reformer. Has the advantage.

The direct methanol fuel cell stack can be classified into an active method using a separate fuel supply device such as a fuel pump directly according to a fuel supply method, and a passive method using another pressure source or osmotic pressure to replace the fuel pump. .

In the case of the active direct methanol fuel cell stack, the fuel pump supplies liquid fuel to the anode of the fuel cell. In this case, the fuel cell stack provides characteristics of the fuel cell such as a material of the polymer electrolyte membrane in order to obtain an optimum efficiency. Membrane characteristics by the thickness or the like, electrode characteristics by the material, structure, or thickness of the anode electrode and the cathode electrode, crossover characteristics due to the crossover phenomenon in which fuel moves through the electrolyte membrane to the cathode electrode side, and moisture in the liquid fuel The fuel concentration and the fuel supply amount are set in consideration of the water osmosis characteristic caused by the phenomenon of permeation and movement to the cathode side.

On the other hand, when the amount of fuel supplied to the fuel cell stack is lower or higher than the preset fuel supply amount due to various reasons, the output of the fuel cell stack is reduced, especially when the fuel supply amount is lower than a predetermined amount, the fuel cell stack suddenly operates. Since it can be stopped, the amount of fuel supplied to the fuel cell stack must be monitored and tightly controlled.

However, in most existing direct methanol fuel cell systems, only the operating speed of the fuel pump is controlled to control the amount of fuel supplied to the fuel cell stack, so that the flow path in the fuel pump is partially blocked by impurities contained in the fuel, or the like. When an abnormality occurs in the fuel pump itself due to abrasion of components in the fuel pump, there is a limit that it is difficult to predict it in advance or to cope with such an abnormal condition properly.

Therefore, the technical problem to be achieved by the present invention is to provide a fuel pump malfunction detection method that can monitor the status of the fuel pump in a new and simple way, and immediately notify the user, if a problem occurs in the fuel pump.

In addition, the technical problem to be achieved by the present invention is to provide a fuel cell system that can improve the stability of the system by employing the above-described fuel pump malfunction detection method.

In order to achieve the above technical problem, according to an aspect of the present invention, a fuel pump for transferring the fuel from the fuel storage container for storing the liquid fuel to the fuel cell for generating electrical energy by the electrochemical reaction of the fuel and the oxidant A method for detecting a malfunction of the fuel pump in a control device connected to the method, the method comprising: measuring an initial amount of fuel and a concentration of the fuel stored in the fuel storage container; Selecting a driving voltage and a waveform of the fuel pump based on the fuel concentration; Measuring the remaining fuel remaining in the fuel storage container after a certain time; Calculating a transfer fuel amount to be transferred to the fuel cell through the fuel pump based on a driving voltage and a waveform of the fuel pump and the predetermined time; Comparing the value obtained by subtracting the remaining fuel amount from the initial fuel amount with the value of the transport fuel amount and determining whether the compared value is greater than or equal to an error range; As a result of the determination, if the compared value is greater than or equal to an error range, measuring a voltage applied to the fuel pump from the control device and comparing the measured voltage with the set driving voltage; And a step of outputting information for informing the abnormality of the fuel pump when the measured voltage is close to the driving voltage, thereby providing a malfunction detection method of the fuel pump.

Preferably, the malfunction detection method of the fuel pump may further include outputting information for notifying a system abnormality if the measured voltage does not approach the driving voltage.

Preferably, in the malfunction detection method of the fuel pump, if the comparison result is within the error range, the remaining fuel remaining in the fuel storage container is measured again after another predetermined time, and the driving voltage and waveform of the fuel pump and Recalculate the amount of fuel that should be transferred to the fuel cell through the fuel pump on the basis of another constant time, compare the value of the calculated fuel amount by subtracting the remaining fuel amount measured from the initial fuel amount, and compare the value. The method may further include determining again whether it is out of range.

According to another aspect of the invention, the fuel storage container for storing the liquid fuel; A fuel cell generating electrical energy by an electrochemical reaction between the fuel and an oxidant; A fuel pump transferring the fuel; And a control device connected to the fuel pump, the control device comprising: measuring an initial fuel amount of the fuel and a concentration of the fuel stored in the fuel storage container; Select a driving voltage and a waveform of the fuel pump based on the fuel concentration; Measuring the remaining fuel remaining in the fuel storage container after a certain time; Calculating a transfer fuel amount to be transferred to the fuel cell through the fuel pump based on a driving voltage and a waveform of the fuel pump and the predetermined time; Comparing the value obtained by subtracting the remaining fuel amount from the initial fuel amount with the value of the transport fuel amount and determining whether the compared value is greater than or equal to an error range; If the comparison result is equal to or greater than the error range, measure the voltage applied from the control device to the fuel pump and compare the measured voltage with the set driving voltage; As a result of the comparison, if the measured voltage is close to the driving voltage, outputting information for indicating an abnormality of the fuel pump; When the measured voltage is not close to the driving voltage, it is possible to provide a fuel cell system, characterized in that to perform a series of operations for outputting information for informing the abnormality of the control device itself.

Preferably, the control device may be implemented with at least some functions of a logic circuit or a microprocessor using flip-flops.

Preferably, the fuel cell system may further include a flow rate table connected to the control device, the flow rate table storing information on an appropriate fuel amount set according to the fuel concentration and driving voltage and waveform of the fuel pump set according to the appropriate fuel amount. have. The flow rate table may be stored in a storage device such as a memory.

Preferably, the fuel cell system includes a level sensor unit installed in the fuel storage container to measure the initial fuel amount and fuel residual amount, a concentration sensor unit installed in the fuel storage container to measure the concentration of the fuel, and a time for the fuel pump to operate. At least one of a timer for measuring, a voltage measuring device for measuring the voltage and waveform applied to the fuel pump, and an output device for outputting warning information consisting of at least one of an audio and an image may be further included.

Hereinafter, a method of detecting a malfunction of a fuel pump and a fuel cell system employing the same will be described in detail with reference to the accompanying drawings.

1 is a block diagram illustrating a fuel cell system employing a fuel pump malfunction detection method according to an embodiment of the present invention.

Referring to FIG. 1, the fuel cell system of the present embodiment includes a fuel storage container 10 for storing liquid fuel, a level sensor unit 12 for measuring the amount of fuel stored in the fuel storage container 10, and a fuel storage container. Concentration sensor unit 14 for measuring the concentration of fuel stored in (10), fuel cell stack 20, fuel storage container 10 for electrochemically reacting fuel and oxidant and extracting the reaction energy directly into electrical energy. Fuel pump 30 for transporting the fuel stored in the fuel cell stack 20 to the fuel cell stack 20, maintaining the amount of fuel stored in the fuel storage container 10 at a predetermined level or supplying the fuel cell stack 20 according to preset control information. And a control device 40 for controlling the amount of fuel and oxidant to be supplied and monitoring the malfunction of the fuel pump 30, and output devices 50a and 50b for notifying the occurrence of the malfunction of the fuel pump 30.

In particular, the fuel cell system of the present embodiment calculates and calculates the amount of fuel to be transferred for a predetermined time according to the driving voltage and waveform of the fuel pump 30 selected based on the concentration of the fuel stored in the fuel storage container 10. By comparing the amount of fuel transported with the amount of change of the fuel stored in the fuel storage container 10 is characterized in that it is made to easily detect the malfunction of the fuel pump 30 and to warn the user and the like.

In more detail, the main components of the fuel cell system described above, the fuel storage container 10 is a fuel containing hydrogen, liquid fuel that can be controlled by the fuel pump 30, for example, methanol, It is a device for storing ethanol, formic acid and the like.

The level sensor unit 12 may be a conventional sensor unit of a variety of methods, for example, the level sensor for measuring the level using a resistance that changes depending on the flow rate of the fuel stored in the fuel storage container 10 or different Level sensors using multiple sensors of height may be used.

The concentration sensor unit 12 is a device for measuring the fuel concentration in the liquid fuel that can be used in the present embodiment, such as aqueous methanol solution can be used a variety of conventional sensor units, for example, the ultrasonic propagation rate in methanol solution A methanol sensor that measures the concentration by the propagation time of ultrasonic waves using a property that depends on the concentration can be used.

The fuel cell stack 20 may be implemented as a direct methanol fuel cell or a direct formic acid fuel cell that generates electrical energy using liquid fuel directly. In this embodiment, it is preferable to select and use a direct methanol type fuel cell, and in this case, there is an advantage of using a fuel having a higher energy density than the direct formic acid fuel cell.

The fuel pump 30 is a device that sucks fuel from the fuel storage container 10 and pumps the fuel to the fuel cell stack 20. The fuel pump 30 refers to a device that transfers liquid using the power of a prime mover, preferably an electric motor. Pumps, rotary pumps, and the like. A reciprocating pump is a pump that injects pressure into a liquid by inserting a piston or plunger into a cylindrical cylinder to reciprocate, and a centrifugal pump rotates an impeller to rotate the liquid. And a pump for transferring liquid by the action of the centrifugal force, and a rotary pump is a pump for continuously feeding liquid by rotating a rotor in a casing. The reciprocating pump includes a diaphragm pump, which acts as a pump by changing the volume of the pump case by the vertical movement of the diaphragm.

The fuel pump 30 described above is driven and stopped by the control signal of the control device 40 and the operation speed thereof is controlled. In addition, the fuel pump 30 is installed inside the fuel storage container 10 or is integrally coupled to the fuel storage container 10 or coupled to a pipe connecting the fuel storage container 10 and the fuel cell stack 20. Can be installed.

The control device 40 receives information about the flow rate and concentration of the fuel stored in the fuel storage container 10 from the level sensor unit 12 and the concentration sensor unit 14, and based on the fuel concentration, the fuel cell stack ( A proper fuel amount to be supplied to 20) is calculated, and a driving voltage and a waveform of the fuel pump 30 corresponding to the calculated appropriate fuel amount are determined. The appropriate fuel amount is set to reflect characteristics that affect the performance of the fuel cell stack 20 such as fuel crossover characteristics. In the present embodiment, a flow rate table in which the driving voltage and the waveform of the fuel pump are set may correspond to the characteristic of the fuel cell stack 20 corresponding to the appropriate fuel amount according to the fuel concentration. The flow rate table may be stored in a storage device 42 coupled to the control device 40. The storage device 42 may use various conventional storage media using electric, magnetic, optical, etc., such as a RAM, a ROM, a hard disk, a magnetic tape, and a flash memory.

In addition, the control device 40 senses the voltage and waveform applied to the fuel pump 30, and in particular, even when the voltage and current waveforms of the fuel pump 30 are high frequency, such as pulse width modulation (PWM). Detect the (RMS) output. To this end, the fuel cell system of the present invention may further include a power measuring device 44 coupled to the fuel pump 30 and the control device 40. The power measuring device 44 may be implemented as an analog-to-digital converter, and the analog-to-digital converter described above may be implemented as an input terminal or some function of the control device 40 such as a microcontroller. The above-described control device 40 may be implemented with at least some functions of a logic circuit or a microprocessor using flip-flops.

In addition, when the controller 40 detects an abnormality of the fuel pump 30, the controller 40 controls an output device connected to the controller 40, for example, an audio output device 50a and / or an image output device 50b. Inform another system or user. Therefore, according to the present invention, if the fuel pump 30 malfunctions due to wear of internal components of the fuel pump 30 or impurities that block the internal flow path of the fuel pump 30, the fuel pump 30 malfunctions and is quickly found. It is possible to warn you. As described above, the present invention detects and warns a malfunction of the fuel pump 30 through a simple fuel pump malfunction detection method, thereby preventing adverse effects on the safety and life of the fuel cell system, thereby improving reliability of the fuel cell system. Can be improved.

2 is a flowchart illustrating a fuel pump malfunction detection method according to an exemplary embodiment of the present invention.

Referring to FIGS. 1 and 2, first, the control device 40 is configured to store the fuel stored in the fuel storage container 10 through the level sensor unit 12 and the concentration sensor unit 14 installed in the fuel storage container 10. The initial fuel amount F_v1 and the concentration are sensed (S10).

Next, the driving voltage and the waveform of the fuel pump 30 are selected based on the appropriate fuel amount corresponding to the sensed fuel concentration (S12). Herein, the appropriate fuel amount means a preferred fuel supply amount preset according to the fuel concentration in consideration of the characteristics of the fuel cell stack 20. In the present invention, the fuel supply speed and the flow rate corresponding to the desired fuel supply amount are stored in the flow rate table, and the flow rate table is used to determine the driving voltage and the waveform of the fuel pump. According to the above configuration, by actively controlling the fuel supply speed and flow rate according to the fuel concentration, the fuel cell stack 20 can be operated under optimum conditions in terms of fuel supply.

Next, the control device 40 detects the fuel level stored in the fuel storage container 10, that is, the fuel remaining amount F_v2, after a predetermined time elapses (S14). The amount of fuel F_pump to be transferred from the fuel storage container 10 to the fuel cell stack 20 through the fuel pump 30 based on the predetermined driving voltage and waveform of the fuel pump 30 and the above-described predetermined time. To calculate (S16).

Next, the control device 40 uses the values obtained in the previous steps, the initial fuel amount F_v1, the fuel remaining amount F_v2, and the transfer fuel amount F_pump and the fuel change amount F_v1-F_v2 in the fuel storage container 10. It is determined whether the absolute value with respect to the difference of the feed fuel amount F_pump is more than the arbitrary error value F_e1 (S18). As a result of the determination, if it is smaller than the random error value F_e1, the control unit 40 detects the remaining fuel remaining in the fuel storage container 10 again through the level sensor unit 12 after another predetermined time, and the fuel The process for monitoring whether the fuel pump 30 malfunctions is performed again based on the fuel change amount in the storage container 10 and the amount of transport fuel to be transported by the fuel pump 30. In this case, another predetermined time may be a cumulative time obtained by adding the previous previous time and the current predetermined time.

However, as a result of the determination, if the absolute value is equal to or greater than a certain error value F_e1, the control device 40 detects the actual voltage applied to the fuel pump 30 through the power measuring device 44 (S20). The controller 40 determines whether the absolute value of the difference between the driving voltage and the actual voltage of the fuel pump obtained from the flow rate table is smaller than another arbitrary error value F_e2 based on the fuel concentration (S22). As a result of the determination, if the absolute value is smaller than the arbitrary error value F_e2, it is determined that the fuel pump 30 is malfunctioning, and the abnormality of the fuel pump 30 is warned through the output devices 50a, 50b and the like. As a result of the determination, if the absolute value is equal to or greater than the arbitrary error value F_e2, the system abnormality is warned through the output devices 50a and 50b and the like (S26).

On the other hand, as a method of notifying the abnormality of the fuel pump 30, an existing method of notifying the user's portable terminal through wired or wireless communication may be considered.

According to the fuel pump malfunction detection method of the present embodiment, it is possible to easily and accurately determine whether the fuel pump operates normally by comparing the amount of fuel to be transferred from the fuel storage container to the fuel cell stack by the operation of the fuel pump and the fuel change amount in the fuel storage container. can do.

3 is an exploded cross-sectional view illustrating a polymer electrolyte fuel cell employable in a fuel cell system according to an exemplary embodiment of the present invention.

Referring to FIG. 3, the polymer electrolyte fuel cell according to the present embodiment is preferably implemented as a direct methanol fuel cell stack. In order to obtain a desired output voltage and output current, a plurality of unit cells are structurally stacked or electrically series. It can have a connected structure. In this embodiment, a fuel cell having a simple structure consisting of one unit cell will be described as an example.

The unit cell constituting the fuel cell stack basically includes a polymer electrolyte membrane 21 and an anode electrode 22 and a cathode electrode 23 bonded to both surfaces of the electrolyte membrane 21. The basic structure of the unit cell composed of the electrolyte membrane 21, the anode electrode 22 and the cathode electrode 23 is called a membrane-electrode assembly. The anode electrode 22 and the cathode electrode 23 have a metal catalyst layer 22a (23a) and a diffusion layer to improve the performance of electrochemical reactivity, ion conductivity, electron conductivity, fuel transfer, by-product transfer, interfacial stability, etc. ) 22b; 23b, respectively.

In addition, the fuel cell stack includes an anode plate 25 provided with a flow field 25a for supplying fuel to the anode electrode 22, and a flow path 26a for supplying an oxidant to the cathode electrode 23. It may include a cathode plate 26 is installed. The anode plate 25 and the cathode plate 26 may be made of one bipolar plate with exposed flow paths 25a and 26a on both sides, and may be structurally stacked by a pair of end plates 27 and 28. When the above-described bipolar plate is placed between the unit cells stacked in the electricity generating unit can be used.

The operation principle of the fuel cell stack described above is as follows.

When the hydrogen-containing fuel is supplied to the anode electrode 22 and the oxidant is supplied to the cathode electrode 23, the hydrogen ions generated in the anode-side metal catalyst layer 22a are directed to the cathode electrode 23 side through the polymer electrolyte membrane 21. In the cathode-side metal catalyst layer 23a, hydrogen ions, oxygen, and electrons react to generate water. On the other hand, the electrons generated in the anode-side metal catalyst layer 22a move to the cathode electrode 23 side through an external circuit to convert the amount of change in free energy obtained through a chemical reaction into electrical energy. In the overall reaction formula, when the hydrogen-containing fuel is methanol, methanol and oxygen react to produce water and carbon dioxide as shown in Scheme 1 below. In addition, in the fuel cell stack, a crossover phenomenon in which the methanol aqueous solution moves from the anode electrode 22 side to the cathode electrode 23 side through the polymer electrolyte membrane 21 occurs. This crossover phenomenon is due to technical limitations in the fabrication of the current polymer electrolyte membrane 21.

_{Anode: CH 3 OH + H 2 O} -> CO 2 + 6H + + 6e -

^{_{Cathode: 3 / 2O 2 + 6H +}} + 6e - -> 3H 2 O

Total: CH ₃ OH + 3 / 2O _2- > CO ₂ + 2H ₂ O

On the other hand, crossover occurs in all fuel cell stacks that are currently available. In the fuel cell system according to the present invention, the optimum fuel concentration is set in consideration of the amount of fuel consumed in the fuel cell stack and the crossover amount. Means for retaining may be additionally provided.

In addition, the fuel cell system according to the present exemplary embodiment may further include a recycling means coupled to the fuel pump and the fuel cell stack in order to improve system efficiency. The recycling means comprises a device for reusing fuel or water.

The present invention can anticipate undesired changes in the fuel supplied to the fuel cell stack by the fuel pump, thereby preventing the system from operating under undesired conditions and thus improving the stability of the system.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and it is common in the art that various substitutions, modifications, and changes can be made without departing from the technical spirit of the present invention. It will be evident to those who have knowledge of.

As described above, according to the present invention, since the malfunction of the fuel pump for supplying fuel stored in the fuel storage container to the fuel cell stack can be detected by a simple configuration and method, the operating condition of the system is deteriorated by the fuel pump. You can prevent it in advance. In addition, it is possible to improve the reliability of the fuel cell stack and the fuel cell system exhibiting optimal performance under certain conditions.

Claims (7)

In a method for detecting a malfunction of the fuel pump in a control device connected to the fuel pump for transferring the fuel from the fuel storage container for storing the liquid fuel to the fuel cell for generating electrical energy by the electrochemical reaction of the fuel and oxidant , Measuring an initial fuel amount of the fuel and a concentration of the fuel stored in the fuel storage container; Selecting a driving voltage and a waveform of the fuel pump based on the fuel concentration; Measuring the remaining fuel remaining in the fuel storage container after a certain time; Calculating a transfer fuel amount to be transferred to the fuel cell through the fuel pump based on a driving voltage and a waveform of the fuel pump and the predetermined time; Comparing the value obtained by subtracting the remaining fuel amount from the initial fuel amount with the value of the transport fuel amount and determining whether the compared value is greater than or equal to an error range; As a result of the determination, if the compared value is greater than or equal to an error range, measuring a voltage applied to the fuel pump from the control device and comparing the measured voltage with the set driving voltage; And And outputting information for informing the abnormality of the fuel pump when the measured voltage is close to the driving voltage. The method of claim 1, And outputting information for notifying a system abnormality, if the measured voltage is not close to the driving voltage. The method of claim 2, As a result of the determination, if the compared value is within the error range, the fuel remaining amount remaining in the fuel storage container is measured again after another predetermined time, and based on the driving voltage and waveform of the fuel pump and the other predetermined time The fuel amount to be transferred to the fuel cell is again calculated through a fuel pump. The fuel is compared with a value obtained by subtracting the remaining fuel amount measured from the initial fuel amount and the calculated fuel amount again and the compared value is within an error range. Method for detecting a malfunction of the fuel pump further comprising the step of determining again the authorization. A fuel storage container for storing liquid fuel; A fuel cell generating electrical energy by an electrochemical reaction between the fuel and an oxidant; A fuel pump transferring the fuel; And Including a control device connected to the fuel pump, The control device, Measuring an initial fuel amount of the fuel and a concentration of the fuel stored in the fuel storage container; Select a driving voltage and a waveform of the fuel pump based on the fuel concentration; Measuring the remaining fuel remaining in the fuel storage container after a certain time; Calculating a transfer fuel amount to be transferred to the fuel cell through the fuel pump based on a driving voltage and a waveform of the fuel pump and the predetermined time; Comparing the value obtained by subtracting the remaining fuel amount from the initial fuel amount with the value of the transport fuel amount and determining whether the compared value is equal to or greater than an error range; If the comparison result is equal to or greater than the error range, measure the voltage applied from the control device to the fuel pump and compare the measured voltage with the set driving voltage; As a result of the comparison, if the measured voltage is close to the driving voltage, outputting information for indicating an abnormality of the fuel pump; And if the measured voltage is not close to the driving voltage, performing a series of operations of outputting information for informing the abnormality of the control device itself. The method of claim 4, wherein The control device is a fuel cell system implemented with at least some functions of a logic circuit or a microprocessor using a flip-flop. The method of claim 5, wherein And a flow rate table in which the appropriate fuel amount set according to the fuel concentration and the driving voltage and the waveform set according to the appropriate fuel amount are stored. The method according to any one of claims 4 to 6, A level sensor unit installed in the fuel storage container to measure the initial fuel amount and the remaining fuel amount, a concentration sensor unit installed in the fuel storage container to measure the concentration of the fuel, and a time for operating the fuel pump And a timer, a voltage measuring device for measuring the voltage and the waveform applied to the fuel pump, and at least one of an output device for outputting the information including at least one of an audio and an image.

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