WO2024135153A1 - Système de mesure de gaz, procédé de mesure de gaz et programme de mesure de gaz - Google Patents

Système de mesure de gaz, procédé de mesure de gaz et programme de mesure de gaz Download PDF

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WO2024135153A1
WO2024135153A1 PCT/JP2023/040600 JP2023040600W WO2024135153A1 WO 2024135153 A1 WO2024135153 A1 WO 2024135153A1 JP 2023040600 W JP2023040600 W JP 2023040600W WO 2024135153 A1 WO2024135153 A1 WO 2024135153A1
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gas
concentration
information
time
concentration information
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PCT/JP2023/040600
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English (en)
Japanese (ja)
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卓司 生田
茂 中谷
健太郎 石田
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株式会社堀場製作所
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  • the present invention relates to a gas measurement system, a gas measurement method, and a gas measurement program.
  • Patent Document 1 discloses an exhaust gas measurement system that measures the concentration and amount of various components contained in exhaust gas emitted from an automobile's internal combustion engine.
  • FCVs Fuel Cell Vehicles
  • the oxygen balance method is known as a method for measuring the fuel efficiency of FCVs.
  • the direct method involves continuously sampling the gas flowing through a pipe and continuously measuring the gas flow rate and the concentration of gas components (e.g. oxygen, hydrogen, water) contained in the gas over time.
  • gas components e.g. oxygen, hydrogen, water
  • a time delay may occur in the measured gas flow rate due to the responsiveness of the sensor. If such a time delay occurs, it becomes difficult to accurately calculate the oxygen consumption amount using the gas flow rate and oxygen concentration.
  • a test may be performed in advance to determine the delay time in measuring the oxygen concentration, and the oxygen consumption amount may be calculated taking the delay time into account.
  • this method requires the preparation of equipment and labor to perform the test.
  • the present invention has been made to solve the above problems, and its purpose is to provide a gas measurement system, a gas measurement method, and a gas measurement program that can accurately determine the consumption amount of gas components contained in gas flowing inside a pipe using a simple method.
  • a gas measurement system includes a flowmeter that measures the flow rate of gas flowing through a pipe and obtains flow rate information, which is time series data; a first gas sensor that measures the concentration of a specific gas component contained in the gas and obtains first concentration information, which is time series data; a second gas sensor that measures the concentration of the specific gas component contained in the gas and obtains second concentration information, which is time series data; and a calculation unit that calculates a time difference between the measurement of the concentration of the specific gas component contained in the gas based on the first concentration information and the second concentration information, and corrects the time difference of the first concentration information or the second concentration information relative to the flow rate information based on the calculated time difference.
  • a gas measurement method includes a flow information acquisition step in which (the flow meter) measures the flow rate of gas flowing in a pipe and acquires flow information, which is time series data; a first concentration information acquisition step in which (the first gas sensor) measures the concentration of a predetermined gas component contained in the gas and acquires first concentration information, which is time series data; a second concentration information acquisition step in which (the second gas sensor) measures the concentration of the predetermined gas component contained in the gas and acquires second concentration information, which is time series data; and a calculation step in which (the calculation unit) calculates the time difference when the concentration of the predetermined gas component contained in the gas is measured based on the first concentration information and the second concentration information, and corrects the time difference of the first concentration information or the second concentration information relative to the flow information based on the calculated time difference.
  • a gas measurement program is a program for causing a computer to execute a calculation process for calculating a time difference between the measurement times of the concentration of a specific gas component contained in a gas based on first concentration information, which is time series data obtained by measuring the concentration of a specific gas component contained in a gas flowing through a pipe using a first gas sensor, and second concentration information, which is time series data obtained by measuring the concentration of the specific gas component contained in the gas using a second gas sensor, and a correction process for correcting a time difference between the first concentration information or the second concentration information relative to the flow rate information based on the time difference.
  • first concentration information which is time series data obtained by measuring the concentration of a specific gas component contained in a gas flowing through a pipe using a first gas sensor
  • second concentration information which is time series data obtained by measuring the concentration of the specific gas component contained in the gas using a second gas sensor
  • the consumption amount of gas components contained in the gas flowing through a pipe can be accurately determined using a simple method.
  • FIG. 1 is an explanatory diagram showing a schematic configuration of a gas measurement system according to an embodiment of the present invention.
  • 4 is a graph showing an example of flow rate information, first concentration information, and second concentration information.
  • 10 is a graph showing a relationship between the flow rate information and the first concentration information.
  • 10 is a graph showing a relationship between the flow rate information and the second concentration information.
  • FIG. 2 is an explanatory diagram showing each parameter measured in the oxygen balance method.
  • 4 is a flowchart showing a flow of operations in the gas measurement system.
  • 11 is a graph showing the flow rate information, the first concentration information, and the corrected second concentration information together.
  • FIG. 1 is an explanatory diagram showing a schematic configuration of a gas measurement system 1 of the present embodiment.
  • the gas measurement system 1 is a system that measures the flow rate of gas discharged from a vehicle 100 as a test specimen and the concentration of gas components contained in the gas, and calculates the fuel consumption of the vehicle 100.
  • a vehicle FCV; Fuel Cell Vehicle
  • the fuel consumption refers to hydrogen consumption.
  • the specimen may be the fuel cell 101 itself, or a part of a vehicle 100 equipped with a fuel cell 101.
  • An example of a part of a vehicle 100 equipped with a fuel cell 101 could be an incomplete vehicle that is equipped with a fuel cell 101 but has not yet been manufactured to a state where it can be sold on the market.
  • the gas measurement system 1 includes a flow meter 2, a first gas sensor 3, a second gas sensor 4, an analyzer 5, a calculation unit 6, and a display unit 7.
  • the flowmeter 2 continuously measures the flow rate of gas discharged from the vehicle 100 (particularly the fuel cell 101) through the pipe 102 to obtain flow rate information.
  • An example of the flow rate information obtained by the flowmeter 2 is shown in FIG. 2 as a thin solid line graph.
  • the flowmeter 2 is configured, for example, as an ultrasonic flowmeter, but may also be configured as another type of flowmeter (for example, a pitot tube flowmeter).
  • the first gas sensor 3 continuously measures the concentration of a predetermined gas component contained in the gas discharged from the vehicle 100 over time to obtain concentration information (first concentration information).
  • concentration information concentration information obtained by the first gas sensor 3
  • FIG. 2 an example of the first concentration information obtained by the first gas sensor 3 is shown in a graph indicated by a thin dashed line.
  • oxygen is considered as the predetermined gas component. Therefore, the first gas sensor 3 is an oxygen meter that measures the concentration of oxygen.
  • the first gas sensor 3 is composed of a zirconia oxygen sensor with excellent responsiveness.
  • the first gas sensor 3 is disposed near the flowmeter 2. That is, the first gas sensor 3 is disposed at a position closer to the flowmeter 2 than the second gas sensor 4. This allows the measurement of oxygen concentration by the first gas sensor 3 and the measurement of gas flow rate by the flowmeter 2 to be performed in a time-series manner. That is, the first concentration information and the flow rate information can be made to be in a time-series manner.
  • the first gas sensor 3 may be incorporated in the flowmeter 2. That is, the first gas sensor 3 may be configured integrally with the flowmeter 2. In this embodiment, the first gas sensor 3 is disposed downstream of the flowmeter 2 in the flow direction of gas discharged from the vehicle 100, but may also be disposed upstream.
  • the second gas sensor 4 continuously measures the concentration of a specific gas component contained in the gas discharged from the vehicle 100 over time to obtain concentration information (second concentration information).
  • concentration information concentration information obtained by the second gas sensor 4
  • FIG. 2 An example of the second concentration information obtained by the second gas sensor 4 is shown in FIG. 2 by a thick solid line graph.
  • the specific gas component whose concentration is to be measured by the second gas sensor 4 is at least the same as the gas component measured by the first gas sensor 3.
  • the second gas sensor 4, like the first gas sensor 3, is also configured as an oxygen meter that measures the concentration of oxygen.
  • the second gas sensor 4 is a magnetic pressure oxygen sensor.
  • Magnetic pressure oxygen sensors have a response time delay compared to zirconia oxygen sensors, but have the advantage of being able to measure oxygen concentration with high accuracy.
  • the response delay of the second gas sensor 4 can be caused by sampling delays, the length of the piping through which the exhaust gas flows, the use of a pump to draw in the exhaust gas, etc.
  • the analyzer 5 continuously measures the flow rate and concentration of gas components other than the gas components (here, oxygen) whose concentrations are measured by the first gas sensor 3 and the second gas sensor 4.
  • gas components other than oxygen include, for example, hydrogen, carbon dioxide, carbon monoxide, nitrogen oxides, hydrocarbons, ammonia, formaldehyde, particulate matter, solid particles, or water.
  • the display unit 7 displays the results measured by the flowmeter 2, the first gas sensor 3, the second gas sensor 4, and the analyzer 5, as well as the results of calculations performed by the calculation unit 6.
  • a display unit 7 is configured, for example, with a liquid crystal display device.
  • FIG. 3 shows the relationship between the measurement value (first concentration information) of the first gas sensor 3 and the measurement value (flow rate information) of the flow meter 2.
  • the time shown on the horizontal axis is the elapsed time from the start of measurement, and is time information common to the first gas sensor 3 and the flow meter 2. Since the first gas sensor 3 is an analyzer with a very small time lag, it can be considered that there is no time lag between the measurement value of the first gas sensor 3 and the measurement value of the flow meter 2. Therefore, the time information of both measurement values can be considered to be correct. However, the accuracy of the concentration information shown by the first gas sensor 3 is low.
  • FIG. 4 shows the relationship between the measurement value (second concentration information) of the second gas sensor 4 and the measurement value (flow rate information) of the flow meter 2.
  • the time shown on the horizontal axis is the elapsed time from the start of measurement, and is time information common to the second gas sensor 4 and the flow meter 2.
  • the measurement value (concentration value) of the second gas sensor 4 is a highly accurate value, but since the second gas sensor 4 is an analyzer that generates a time difference, there is a time lag between the measurement value of the second gas sensor 4 and the measurement value of the flow meter 2.
  • the time information that the measurement value should indicate is correct from the first gas sensor 3, and the concentration information that the measurement value should indicate is correct from the second gas sensor 4.
  • the value (concentration information) indicated by the first gas sensor 3 is not as accurate as the value indicated by the second gas sensor 4, but behavior such as maximum and minimum values of the waveform can be detected.
  • the reason why the waveforms of the first gas sensor 3 and the second gas sensor 4 may not necessarily be similar is thought to be due to the shape of the sensors, non-uniformity of the exhaust gas components, etc.
  • the calculation unit 6 is composed of a calculation device such as a CPU (Central Processing Unit) and operates according to a predetermined operation program.
  • the operation program is stored in a memory unit (not shown) within the calculation device.
  • the arithmetic unit 6 has the functions of a calculation unit 11, a correction unit 12, and a processing unit 13.
  • the calculation unit 11 calculates the time difference when the concentration of a predetermined gas component contained in a gas with the same flow rate is measured based on the first concentration information acquired by the first gas sensor 3 and the second concentration information acquired by the second gas sensor 4. For example, the calculation unit 11 calculates the delay time of one of the first concentration information and the second concentration information relative to the other as the above-mentioned time difference.
  • the correction unit 12 corrects the time lag of the first concentration information or the second concentration information relative to the flow rate information acquired by the flowmeter 2 based on the time difference calculated by the calculation unit 11. Note that the details of the processes performed by the calculation unit 11 and the correction unit 12 will be described later.
  • the processing unit 13 calculates the oxygen consumption based on the flow rate information and the other concentration information after correction.
  • the processing unit 13 then calculates the hydrogen consumption based on the calculated oxygen consumption and the concentration information of the other gas components acquired by the analyzer 5.
  • the processing unit 13 measures fuel efficiency by using the hydrogen consumption and the mileage information of the test specimen.
  • the mileage information can be obtained, for example, by mounting the vehicle on a dynamometer DY (see FIG. 5) and simulating a driving condition similar to road driving.
  • the hydrogen consumption and/or mileage information may be obtained by driving the vehicle on the dynamometer DY in a predetermined driving mode.
  • the predetermined driving mode may be, for example, a worldwide harmonized test cycle called WLTC (Worldwide harmonized Light duty Test Cycle).
  • the work amount information of the test specimen may be converted into mileage information to measure fuel efficiency.
  • the work amount information refers to information on the amount of work per unit time performed by the test specimen. For example, if it is known in advance that the test specimen will travel N (km) with a workload of K (W) per unit time, the fuel efficiency of the test specimen can be measured by calculating hydrogen consumption/N/K, that is, the amount of gas consumed per unit workload of the test specimen can be measured.
  • the calculation of hydrogen consumption in the processing unit 13 is performed based on the oxygen balance method.
  • Other methods for measuring fuel efficiency in FCVs include the mass method, pressure method, and flow rate method. However, all of these methods require hydrogen to be supplied from outside the vehicle, and require modifications to the hydrogen supply line of the FCV to insert an external hydrogen supply line for testing.
  • the oxygen balance method is effective in that, in principle, it is possible to measure fuel efficiency without modifying the vehicle, and it is possible to perform fuel efficiency tests on completed vehicles. Below, we will explain how to calculate hydrogen consumption using the oxygen balance method.
  • Calculation method of hydrogen consumption using oxygen balance method 5 is an explanatory diagram showing the parameters measured in the oxygen balance method (particularly the direct method).
  • the processing unit 13 calculates the hydrogen consumption amount based on the following formulas (1) to (4).
  • ⁇ Q O2 QA ⁇ CA O2
  • ⁇ QE ⁇ CE O2 (QE ⁇ CE URG ) ⁇ (CA O2 /CA URG ) ⁇ (QE ⁇ CE O2 ) (1)
  • QE H2 QE ⁇ CE H2 (2)
  • each parameter is as follows (all represent flow rates or concentrations in a dry state): QA : Intake air flow rate [ m3 /min] CA O2 : Oxygen ( O2 ) concentration in intake air [vol.%] CA H2O : Moisture ( H2O ) concentration in intake air [vol.%] CA URG : Non-reactive gas concentration in intake air [vol.%] QE : Exhaust gas flow rate [ m3 /min] CEO2 : Oxygen ( O2 ) concentration in exhaust gas [vol.%] CE H2O : Moisture ( H2O ) concentration in exhaust gas [vol.%] CE URG : Non-reactive gas concentration in exhaust gas [vol.%] CE H2 : Hydrogen ( H2 ) concentration in exhaust gas [vol.%] QE H2 : Hydrogen flow rate [m 3 /min] ⁇ Q O2 : Oxygen consumption [m 3 /min] ⁇ Q H2 : Hydrogen consumption [m 3
  • unreacted gas refers to gas that does not contribute to the reaction of the fuel cell, such as nitrogen ( N2 ), argon (Ar), or carbon dioxide ( CO2 ).
  • N2 nitrogen
  • Ar argon
  • CO2 carbon dioxide
  • the amount of unreacted gas is the same in the intake and exhaust. That is, the amount of unreacted gas in the intake air (QA x CA URG ) is the same as the amount of unreacted gas in the exhaust gas (QE x CE URG ) (see formula (4)).
  • the amount of oxygen taken in (QA x CA O2 ) is calculated from the amount of unreacted gas in the exhaust gas (QE x CE URG ) and the ratio of the oxygen concentration in the intake air to the unreacted gas concentration (CA O2 /CA URG ). Note that by substituting formula (4) into the first line of formula (1), the second line of formula (1) is obtained.
  • the CA URG is calculated by subtracting the oxygen and hydrogen concentrations in the intake air from 100 vol.%
  • the CE URG is calculated by subtracting the oxygen and hydrogen concentrations in the exhaust gas from 100 vol.%.
  • the fuel cell 101 shown in FIG. 1 performs purging to discharge hydrogen at appropriate times in order to maintain the hydrogen purity of the anode at a constant level.
  • the amount of purged hydrogen is simply measured using equation (2).
  • the amount of hydrogen is measured by the analyzer 5.
  • the analyzer 5 has at least a hydrogen meter. Since the fuel cell 101 consumes twice the molar volume of hydrogen as oxygen to generate electricity, the final amount of hydrogen consumed is calculated using equation (3).
  • the processing unit 13 performs calculations by substituting the acquired parameter values into equations (1) to (4).
  • the waveform of the graph showing the first concentration information and the waveform of the graph showing the second concentration information are similar, but the positions of the concentration peaks are shifted in time. That is, there is a time delay between the measurement (concentration detection) of the second gas sensor 4 and the measurement (concentration detection) of the first gas sensor 3. This indicates that the responsiveness of the second gas sensor 4, which is a magnetic pressure type oxygen sensor, is inferior to that of the first gas sensor 3, which is a zirconia oxygen sensor.
  • zirconia oxygen sensors are affected by combustible gases (e.g. hydrogen), etc. For this reason, they are not suitable for use as oxygen meters to measure the concentration of oxygen in the exhaust gas of a fuel cell 101 (which is assumed to contain hydrogen). However, as mentioned above, zirconia oxygen sensors have excellent responsiveness, and can accurately capture changes in oxygen concentration over time.
  • combustible gases e.g. hydrogen
  • zirconia oxygen sensors have excellent responsiveness, and can accurately capture changes in oxygen concentration over time.
  • the concentration of oxygen contained in the exhaust gas is determined by the magnetic pressure oxygen sensor (second gas sensor 4) that can measure the concentration more accurately than the zirconia oxygen sensor.
  • the time delay of the measurement by the second gas sensor 4 is corrected by observing the change in the concentration of oxygen measured by the zirconia oxygen sensor (first gas sensor 3) that has excellent response.
  • This allows the flow rate information obtained by the flow meter 2 and the oxygen concentration information (second concentration information) obtained by the second gas sensor 4 to be matched in time, and the amount of oxygen contained in the exhaust gas (the value of (QE ⁇ CEO2 ) in formula (1)) to be accurately determined. Therefore, the amount of oxygen and the amount of hydrogen consumption can be accurately determined by using the amount of oxygen.
  • FIG. 6 is a flowchart showing the flow of the operation of the gas measurement system 1 of this embodiment.
  • the flowmeter 2 measures the flow rate of the gas flowing through the pipe 102, and obtains flow rate information, which is time series data (S1; flow rate information acquisition process).
  • the first gas sensor 3 measures the concentration of a specific gas component (here, oxygen) contained in the gas flowing through the pipe 102, and obtains first concentration information, which is time series data (S2; first concentration information acquisition process).
  • the second gas sensor 4 measures the concentration of a specific gas component (here, oxygen) contained in the gas flowing through the pipe 102, which is the same as the gas component measured by the first gas sensor 3, and obtains second concentration information, which is time-series data (S3; second concentration information acquisition process).
  • a specific gas component here, oxygen
  • S3 time-series data
  • the calculation unit 6 calculates a delay time ⁇ T between the first concentration information and the second concentration information relative to the other one based on the first concentration information acquired in S2 and the second concentration information acquired in S3 (S4; delay time calculation process).
  • the calculation unit 6 calculates the delay time of the second concentration information relative to the first concentration information as the above-mentioned delay time ⁇ T.
  • the calculation unit 6 calculates the delay time ⁇ T based on the position P1 of the concentration peak over time of the first concentration information shown in FIG. 2 and the position P2 of the concentration peak over time of the second concentration information.
  • each position P1 and P2 corresponds to the measurement time point of the concentration (first concentration, second concentration) of oxygen contained in the gas with the same flow rate. Since each position P1 and P2 corresponds to the maximum of each graph (function) showing the first concentration information and the second concentration information, it can be obtained based on the value obtained by differentiating each graph (first order differential, second order differential).
  • the positions P1 and P2 may be estimated by the user's visual estimation.
  • the calculation unit 6 may calculate the delay time ⁇ T based on the position where the concentration change over time of the first concentration information is minimal and the position where the concentration change over time of the second concentration information is minimal.
  • the calculation unit 6 may also calculate the delay time ⁇ T based on the change point where the concentration change over time of the first concentration information is steep and the change point where the concentration change over time of the second concentration information is steep.
  • the calculation unit 6 may calculate the time difference (delay time ⁇ T) based on the waveform showing the concentration change over time of the first concentration information and the waveform showing the concentration change over time of the second concentration information.
  • the calculation unit 6 (particularly the correction unit 12) corrects the time delay of the other concentration information (second concentration information) relative to the flow rate information based on the delay time ⁇ T calculated in S4 (S5; correction process).
  • S4 and S5 are collectively referred to as the calculation process.
  • the calculation unit 6 performs a correction to advance the other concentration information in time relative to the flow rate information by the delay time ⁇ T calculated in S4.
  • Figure 7 is a graph showing the flow rate information, the first concentration information, and the second concentration information after correction. As shown in the figure, by advancing the second concentration information in time by the delay time ⁇ T, the position P1 of the concentration peak of the first concentration information and the position P2 of the concentration peak of the second concentration information coincide in time.
  • the calculation unit 6 calculates the amount of oxygen contained in the exhaust gas based on the flow rate information and the corrected second concentration information, and calculates the oxygen consumption amount ⁇ Q O2 in the fuel cell 101 (S6; oxygen consumption amount calculation step). Specifically, the processing unit 13 multiplies the flow rate of the exhaust gas (corresponding to QE in formula (1)) at the same time by the oxygen concentration measured by the second gas sensor 4 (corresponding to CEO2 in formula (1)) to calculate the amount of oxygen contained in the exhaust gas. Then, the processing unit 13 calculates the oxygen consumption amount ⁇ Q O2 in the fuel cell 101 based on the above formula (1). It is assumed that the non-reactive gas concentration in the exhaust gas (CE URG ), the oxygen concentration in the intake air (CA O2 ), and the non-reactive gas concentration in the intake air (CA URG ) are obtained in advance.
  • the intake air refers to the air in the test room, but the oxygen concentration value in the intake air may be the predetermined oxygen concentration value in an air gas cylinder.
  • the amount of fluctuation in the oxygen concentration in the air of the test room is set to a range that does not interfere with measurements using the oxygen balance method.
  • the oxygen concentration in the intake air may be measured using an oxygen concentration meter designed for indoor use, or a magnetic oxygen sensor.
  • the oxygen concentration value in the intake air may refer only to the oxygen concentration value measured before the test. If a gas cylinder adjusted to a specified concentration is used instead of air, the oxygen concentration value written on the gas cylinder may be used.
  • the calculation unit 6 calculates the amount of hydrogen consumed ⁇ Q H2 in the fuel cell 101 from the amount of oxygen consumed ⁇ Q O2 calculated in S7 based on the formula (3) (S7; hydrogen consumption calculation step). It should be noted that QE H2 in the formula (3) is calculated by the analyzer 5. Finally, the processing unit 13 calculates the fuel efficiency of the vehicle 100 by dividing the amount of hydrogen consumed ⁇ Q H2 calculated in S7 by the work load information or the travel distance information (S8). The results of S5 to S8 are displayed on the display unit 7 (see FIG. 1).
  • the reasons for selecting positions P1 and P2 when calculating the delay time ⁇ T are as follows.
  • the accuracy of measuring oxygen concentration may decrease if the measured gas contains a large amount of moisture. If some water droplets form on the sensor surface, it is thought that the sensitivity to oxygen decreases, and as is clear from position P3, the absolute value of the oxygen concentration decreases.
  • positions P1, P3, P5, and P7 when we focus on the behavior of large changes in oxygen concentration, we can see that the behavior of the concentration change in the zirconia oxygen sensor follows the behavior of the concentration change in the magnetic pressure oxygen sensor. For this reason, the highest possible oxygen concentration value should be selected as the change point for the zirconia oxygen sensor as well.
  • positions P1 and P2 In determining the validity of the change points, positions P1 and P2 have peak positions that match well (in the time axis direction) after correction, and other combinations of change points (e.g. P3 and P4, P5 and P6, P7 and P8) also have peak positions that match well (in the time axis direction) after correction. For this reason, it is believed that the combination of positions P1 and P2 can be trusted, and in this embodiment, positions P1 and P2 were selected when calculating the delay time ⁇ T.
  • transition points that are detected by the magnetic pressure oxygen sensor but not by the zirconia oxygen sensor e.g. P11 and P12 of the magnetic pressure oxygen sensor.
  • concentration ranges that are slightly away from the range of the reference gas (oxygen concentration of about 8-9 vol%), so it is difficult to expect the concentration values to be as accurate as one would expect within the range of the reference gas. It is considered best not to select these relatively small waveforms as transition points.
  • the calculation unit 6 corrects the time delay of the other concentration information (second concentration information) relative to the flow rate information, so that the flow rate information and the other concentration information can be time-aligned as shown in FIG. 7.
  • This makes it possible to accurately calculate the amount of gas component (oxygen) contained in the exhaust gas, and thus the consumption amount of the gas component, using the flow rate information and the other concentration information.
  • the above correction by the calculation unit 6 makes it unnecessary to artificially perform a test to time-align the flow rate information and the other concentration information in advance.
  • the consumption amount of the gas component contained in the gas flowing in the pipe 102 can be accurately calculated by a simple method using calculation.
  • the calculation unit 6 performs a correction to advance the other concentration information (second concentration information) in time relative to the flow rate information by the calculated delay time ⁇ T, thereby making it possible to synchronize the flow rate information and the other concentration information in time.
  • the calculation unit 6 determines the position P1 of the concentration peak of the first concentration information and the position P2 of the concentration peak of the second concentration information, so that the relative delay time ⁇ T between the first concentration information and the second concentration information can be reliably calculated.
  • the calculation unit 6 can accurately calculate the delay time ⁇ T of the second concentration information relative to the first concentration information, and can accurately time-align the flow rate information and the second concentration information.
  • the magnetic pressure oxygen sensor is less responsive than the zirconia oxygen sensor, it can measure the oxygen concentration more accurately (has better detection accuracy) than the zirconia oxygen sensor. Therefore, by using a magnetic pressure oxygen sensor for the second gas sensor 4, the flow rate information and the second concentration information can be time-matched to accurately determine the amount of oxygen in the exhaust gas, and therefore the oxygen consumption rate.
  • the calculation unit 6 uses the flow rate information acquired by the flow meter 2 and the corrected second concentration information to calculate the oxygen consumption of the vehicle 100 by the oxygen balance method, calculates the hydrogen consumption of the vehicle 100 from the oxygen consumption, and determines the gas amount per unit work amount using the hydrogen consumption amount and the work amount information. This makes it possible to calculate the final fuel efficiency of the vehicle 100.
  • the calculation unit 6 uses the flow rate information acquired by the flow meter 2 and the corrected second concentration information to calculate the oxygen consumption of the vehicle 100 by the oxygen balance method, calculates the hydrogen consumption of the vehicle 100 from the oxygen consumption, and can easily calculate fuel efficiency information of the vehicle 100 by using the hydrogen consumption and the traveling distance information of the vehicle 100 or the traveling distance information calculated from the work amount information.
  • the calculation unit 6 of the gas measurement system 1 of this embodiment can be configured by a computer in which an operating program (application software) is installed.
  • the above program can be read and executed by a computer (for example, the calculation unit 6), which can operate each part of the calculation unit 6 (the calculation unit 11, the correction unit 12, the processing unit 13) to execute each of the above-mentioned processes (each step).
  • a program is acquired, for example, by downloading it from an external source via a network, and stored in a memory in the calculation unit 6.
  • the above program may be recorded in a computer-readable recording medium such as a CD-ROM (Compact Disk-Read Only Memory), and the program may be read from the recording medium and stored in the memory.
  • the gas measurement program of this embodiment is a program for causing a computer to execute the steps S4 to S7 in the gas measurement method of this embodiment described above.
  • the recording medium of this embodiment is a computer-readable recording medium in which the above-mentioned gas measurement program is recorded.
  • the gas measurement system 1 described in this embodiment can also be expressed as a gas analysis device or a gas analysis system that analyzes gas discharged from a test specimen.
  • the test specimen is, as described above, a fuel cell 101, a vehicle 100 including the fuel cell 101, or a part of the vehicle 100.
  • the gas discharged from the test specimen is water vapor generated by a power generation reaction in the fuel cell, consumed oxygen, etc.
  • Vehicle 100 may be a vehicle other than an FCV.
  • vehicle 100 may be a vehicle equipped with an engine that uses gasoline or diesel as fuel.
  • the test specimen may be an engine that uses gasoline or diesel as fuel, or a vehicle equipped with the engine or a part of the vehicle.
  • the gases emitted from the test specimen may include carbon dioxide, nitrogen oxides, ammonia, formaldehyde, etc.
  • the configuration of the gas measurement system described in this embodiment can be applied (in conjunction with a sensor with excellent response) to accurately calculate the fuel consumption.
  • the second concentration information lags behind the first concentration information, so a correction is made to advance the second concentration information in time.
  • a correction can be made to advance the first concentration information in time.
  • the first gas sensor 3 and the second gas sensor 4 may be located either upstream or downstream in the gas flow direction relative to the flowmeter 2. However, if the first gas sensor 3 and the second gas sensor 4 are located upstream relative to the flowmeter 2, the first gas sensor 3 and the second gas sensor 4 may draw in gas to measure the oxygen concentration, which may change the flow rate of the gas flowing downstream and change the flow rate measurement value of the flowmeter 2. Therefore, from the perspective of accurately measuring the flow rate with the flowmeter 2, it is desirable for the first gas sensor 3 and the second gas sensor 4 to be located downstream relative to the flowmeter 2.
  • the second concentration information acquired by the second gas sensor 4 may be shifted in a direction that is earlier in time than the flow information acquired by the flowmeter 2.
  • the calculation unit 6 (particularly the correction unit 12) can chronologically align the flow information and the second concentration information by performing a correction to delay the second concentration information by the above-mentioned time difference based on the time difference between the first concentration information and the second concentration information.
  • the present invention can be used, for example, in a system that determines the consumption of gas components contained in gas flowing through a pipe.
  • Reference Signs List 1 Gas measurement system 2 Flow meter 3 First gas sensor 4 Second gas sensor 6 Calculation unit 100 Vehicle (test specimen) 101 Fuel cell (specimen) 102 Piping ⁇ T Delay time (time lag)

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Abstract

L'invention concerne un système de mesure de gaz comprenant : un débitmètre destiné à mesurer un débit d'un gaz qui s'écoule à travers un tuyau, afin d'acquérir des informations de débit comprenant des données chronologiques; un premier capteur de gaz destiné à mesurer une concentration d'un composant gazeux prescrit contenu dans le gaz, afin d'acquérir des premières informations de concentration comprenant des données chronologiques; un deuxième capteur de gaz destiné à mesurer la concentration du composant gazeux prescrit contenu dans le gaz, afin d'acquérir des deuxièmes informations de concentration comprenant des données chronologiques; et une unité de calcul destinée à calculer une différence de temps entre des temps de mesure des concentrations du composant gazeux prescrit contenu dans le gaz, sur la base des premières informations de concentration et des deuxièmes informations de concentration, et corriger un écart de temps dans les premières informations de concentration ou les deuxièmes informations de concentration par rapport aux informations de débit sur la base de la différence de temps calculée.
PCT/JP2023/040600 2022-12-21 2023-11-10 Système de mesure de gaz, procédé de mesure de gaz et programme de mesure de gaz WO2024135153A1 (fr)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004170357A (ja) * 2002-11-22 2004-06-17 Toyota Motor Corp 排ガス流量計測装置及び排ガスの流量計測方法
JP2005030407A (ja) * 1996-11-22 2005-02-03 Denso Corp 内燃機関の排気浄化装置及び排気浄化方法
JP2005123139A (ja) * 2003-10-20 2005-05-12 Nissan Motor Co Ltd 燃料電池システム
JP2006097597A (ja) * 2004-09-30 2006-04-13 Hitachi Ltd 排気ガスの流量を求める方法，排気ガス流量測定装置及び排気還流制御装置
JP2006284470A (ja) * 2005-04-04 2006-10-19 Horiba Ltd 排気ガス測定装置および排気ガス測定方法
JP2009250935A (ja) * 2008-04-10 2009-10-29 Toyota Motor Corp 燃費計測方法および燃費計測システム

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005030407A (ja) * 1996-11-22 2005-02-03 Denso Corp 内燃機関の排気浄化装置及び排気浄化方法
JP2004170357A (ja) * 2002-11-22 2004-06-17 Toyota Motor Corp 排ガス流量計測装置及び排ガスの流量計測方法
JP2005123139A (ja) * 2003-10-20 2005-05-12 Nissan Motor Co Ltd 燃料電池システム
JP2006097597A (ja) * 2004-09-30 2006-04-13 Hitachi Ltd 排気ガスの流量を求める方法，排気ガス流量測定装置及び排気還流制御装置
JP2006284470A (ja) * 2005-04-04 2006-10-19 Horiba Ltd 排気ガス測定装置および排気ガス測定方法
JP2009250935A (ja) * 2008-04-10 2009-10-29 Toyota Motor Corp 燃費計測方法および燃費計測システム

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