WO2006046423A1

WO2006046423A1 - Hydrogen sensor deterioration detecting system and deterioration detecting method

Info

Publication number: WO2006046423A1
Application number: PCT/JP2005/019030
Authority: WO
Inventors: Kenichi Toyoshima
Original assignee: Nissan Motor Co., Ltd.
Priority date: 2004-10-26
Filing date: 2005-10-17
Publication date: 2006-05-04

Abstract

A hydrogen sensor deterioration detecting system comprising a storage device (2) for storing the history of hydrogen measured concentration and measured time measured by a hydrogen sensor (4), and the correlation between the exposure amount and the deterioration amount per specified time of the hydrogen sensor (4), and a control device (3) for determining the exposure amount per specified time of the hydrogen sensor (4) used in the measurement from the history of measured concentration and measured time to determine a deterioration amount from the correlation between the exposure amount and the deterioration amount.

Description

Specification

Hydrogen sensor degradation detection system and degradation detection method

Technical field

The present invention relates to a hydrogen sensor deterioration detection system and a deterioration detection method, and more particularly to a hydrogen sensor deterioration detection technique provided in a fuel cell system.

Background art

[0002] Conventionally, techniques for detecting a failure or deterioration of a gas sensor provided in a fuel cell system have been actively studied. In Japanese Patent Laid-Open No. 2004-022299, a control device stores a determination threshold value of hydrogen concentration that is set according to the operating state of a fuel cell, and compares this determination threshold value with a detection value of a hydrogen sensor to determine whether or not deterioration has occurred. Is disclosed. Japanese Laid-Open Patent Publication No. 20 03-344331 discloses a method of detecting the presence or absence of deterioration by providing a dummy element in series with a detection element and comparing the voltage drop of the two elements.

Disclosure of the invention

[0003] The detection element of a catalytic combustion type hydrogen sensor or the like is deteriorated by exposure to a hydrogen-containing gas for a long or short time while measuring the hydrogen concentration. When the detection element deteriorates, the hydrogen concentration (true value) of the atmosphere measured by the hydrogen sensor deviates from the measured value of the hydrogen sensor. However, in order to detect the deterioration of the detection element, it was not possible to accurately determine the degree of deterioration of the detection element that the method had in addition to comparing the measured value with a predetermined threshold value.

[0004] Further, when the detection element of the hydrogen sensor is deteriorated, the measured value force of the deteriorated hydrogen sensor is also a method for accurately knowing the hydrogen concentration in the measurement atmosphere. In order to obtain the true value of the hydrogen concentration in the measurement atmosphere, it is necessary to frequently replace the detection element or hydrogen sensor, which makes it difficult to maintain measurement accuracy and increases costs. o

[0005] In the first aspect of the present invention, the hydrogen concentration measured by the hydrogen sensor for measuring the hydrogen concentration and the history of the measurement time, and the correlation between the exposure amount and the deterioration amount of the hydrogen sensor per predetermined time. The amount of exposure per unit time of the hydrogen sensor used for measurement is determined from the measured concentration and measurement time history, and the amount of deterioration is determined from the correlation between the amount of exposure and the amount of deterioration. And a hydrogen sensor deterioration detection system.

[0006] The second aspect of the present invention starts to measure the concentration of hydrogen using a hydrogen sensor that is subject to deterioration detection, stores the history of hydrogen concentration and measurement time measured by the hydrogen sensor, The amount of exposure per unit time of the hydrogen sensor used for measurement is obtained from the history of measurement time, and the amount of deterioration of the hydrogen sensor is calculated from the correlation between the amount of exposure of the hydrogen sensor per unit time prepared in advance and the amount of deterioration. This is a method for detecting deterioration of a hydrogen sensor.

Brief Description of Drawings

[0007] FIG. 1 is a block diagram showing a hydrogen sensor deterioration detection system according to a first embodiment of the present invention.

[FIG. 2] FIG. 2 is a graph showing the relationship between the period during which the hydrogen sensor was used for measurement, the measured concentration, and the deterioration amount of the hydrogen sensor.

[FIG. 3] FIG. 3 is a graph showing the calculated value (integrated value) of the exposure amount per predetermined time from the corrected measured concentration and measurement time history stored in the storage device.

[FIG. 4] FIG. 4 is a graph showing the relationship between the amount of exposure and the amount of deterioration per predetermined time of the hydrogen sensor.

[FIG. 5] FIG. 5 is a graph for explaining a predetermined threshold value when judging the deterioration of the detection element of the hydrogen sensor.

FIG. 6 is a block diagram showing a deterioration detection system for a hydrogen sensor according to a second embodiment of the present invention.

FIG. 7 is a block diagram showing a hydrogen sensor deterioration detection system according to a third embodiment of the present invention.

FIG. 8 is a flowchart showing a control procedure of the deterioration detection system of FIG.

[Fig. 9] Fig. 9 is a graph showing the hydrogen concentration output value when the hydrogen sensor measures the hydrogen concentration X%, with and without correction by the deterioration amount. .

[FIG. 10] FIG. 10 shows the relationship between the presence or absence of correction processing for the hydrogen concentration output value and the ventilation volume (consumption power) of the ventilator.

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiments of the present invention will be described below with reference to the drawings. Same in drawing Similar parts are given the same or similar reference numerals.

[0009] (First embodiment)

As shown in FIG. 1, a deterioration detection system 1 for a hydrogen sensor (hydrogen concentration measuring means) 4 according to a first embodiment of the present invention includes a storage device 2, a control device 3, and an alarm device 6. The storage device 2 uses the hydrogen concentration measured by the hydrogen sensor 4 (specifically, the hydrogen concentration 1A ′ obtained by correcting the output value 1A of the hydrogen sensor 4 based on the deterioration amount of the hydrogen sensor 4 described later by the control device 3). (Hereinafter referred to simply as “measured concentration” or “corrected measured concentration”), that is, the history of measured concentration and measurement time, and the deterioration amount of the hydrogen sensor 4 obtained by the control device 3 are stored. At the same time, the correlation between the exposure amount and deterioration amount of the hydrogen sensor 4 described later is recorded. The control device 3 obtains the exposure amount per predetermined time of the hydrogen sensor 4 used for the measurement from the measured concentration stored in the storage device 2 and the history of the measurement time, and performs the measurement from the exposure amount and the above correlation. The amount of deterioration of the hydrogen sensor 4 being used is obtained and the obtained amount of deterioration is stored in the storage device 2. The alarm device 6 issues an alarm when the deterioration amount obtained by the control device 3 exceeds a predetermined threshold value. Here, the “deterioration amount” is an amount indicating the degree of deterioration of the detection element provided in the hydrogen sensor 4, and is the sum of the deterioration amounts accumulated in the force detection element at the start of use of the hydrogen sensor 4 ( This includes not only the cumulative amount of deterioration) but also the amount of deterioration per unit time, that is, the deterioration rate (deterioration rate).

The hydrogen sensor 4 measures the hydrogen concentration in a desired atmosphere and outputs the measured value 1A to the control device 3. The control device 3 corrects this measured value 1A based on the deterioration amount (for example, cumulative deterioration amount) of the hydrogen sensor 4 that was obtained immediately before and stored in the storage device 2, and obtains the measured concentration 1A ′. Further, the control device 3 causes the storage device 2 to store the concentration 1A ′ and the time (measurement time) 1B when the concentration 1A ′ is measured. The storage device 2 stores the correlation between the deterioration amount 1C of the hydrogen sensor 4 and the exposure amount of the hydrogen sensor 4. The correlation between the amount of deterioration 1C and the amount of exposure can be obtained in advance through experiments. As shown in Fig. 2, in general, in an environment where the hydrogen concentration is constant, the measured concentration of the hydrogen sensor 4 increases as the initial measured concentration (reference value) increases as the period during which the hydrogen sensor 4 is used for measurement (measurement period) increases. The concentration gradually decreases from bO, bl, b2, b3). In addition, the decrease widths δ 1, δ 2, and δ 3 tend to increase as the hydrogen concentration in the measurement atmosphere increases when the measurement period is constant. The decrease ranges δ 1, δ 2, and δ 3 of the measured concentration from the reference concentrations bl, b2, and b3 correspond to the deterioration amount 1C of the hydrogen sensor 4 under each concentration condition.

On the other hand, the exposure amount of the hydrogen sensor 4 is obtained by performing a predetermined calculation of the history power of the corrected measurement concentration 1 A ′ and measurement time 1 B stored in the storage device 2. Specifically, the measured concentration 1A ′ corrected according to the control device 3 force (1) equation is integrated over a predetermined measurement time 、 so that the predetermined time of the hydrogen sensor 4 as shown by the hatched portion in FIG. Determine the amount of exposure per unit of 1E.

[0012] Σ (1Α 'X IB) = IE · · · (1)

The correlation (for example, the relationship shown in FIG. 4) of the exposure amount IE thus obtained and the above-mentioned deterioration amount 1C is determined and stored in the storage device 2.

[0013] The deterioration amount 1C of the hydrogen sensor 4 used for measuring the hydrogen concentration is the exposure amount 1E of the hydrogen sensor 4 obtained by the predetermined calculation and the deterioration amount stored in the storage device 2 in advance. Calculated from the correlation between 1C and 1E. When the obtained deterioration amount 1C becomes larger than the predetermined threshold 1F (for example, the exposure amount 1E and the deterioration amount 1C in FIG. 4), it is determined that the detection element of the hydrogen sensor 4 has deteriorated. Alarm device 6 issues an alarm. As shown in Fig. 5, the measured concentration of the hydrogen sensor 4 generally decreases linearly from the initial measured concentration (reference concentration) for a certain period of time (region T1). Since the deterioration of the hydrogen sensor 4 proceeds at an accelerating rate (region T2), it decreases in a substantially quadratic function from that point. The predetermined threshold value 1F is, for example, as shown in FIG. 5, in which the measured concentration of the hydrogen sensor 4 decreases linearly, in other words, the amount of deterioration of the hydrogen sensor 4 increases approximately in proportion to the measurement time. It is set within a certain range.

[0014] Regarding the correlation between the deterioration amount and the exposure amount, the correlation between the exposure amount per unit time of the hydrogen sensor 4 and the deterioration amount per unit time, and the hydrogen concentration in the measurement atmosphere and the hydrogen sensor 4 As shown in Fig. 2, the correlation with the deterioration rate can also be obtained in advance by experiments. In particular, the deterioration rate of the hydrogen sensor 4 used in the measurement is obtained from the correlation between the latter and the measured concentration 1A 'of the hydrogen sensor 4 (measured concentration corrected by the cumulative deterioration amount of the hydrogen sensor at the time of measurement). Based on this, it is also possible to determine the deterioration of the detection element. Next, a deterioration detection method using the deterioration detection system 1 of FIG. 1 will be described. At the same time, the storage device 2 uses the hydrogen sensor 4 that is subject to deterioration detection to measure the hydrogen concentration in the desired atmosphere. 3 memorizes the history of measured concentration 1A ') and measurement time 1B corrected based on the amount of deterioration. Then, the control device 3 obtains the exposure amount 1E per predetermined time of the hydrogen sensor 4 used for the measurement as well as the history power of the measurement concentration 1A ′ and the measurement time 1B. Further, the control device 3 obtains the deterioration amount of the hydrogen sensor 4 based on the correlation force between the exposure amount 1E and the deterioration amount 1C of the hydrogen sensor 4 per predetermined time prepared in advance. That is, the control device 3 obtains the exposure amount 1E of the hydrogen sensor 4 per predetermined time by a predetermined calculation for the measurement concentration 1A ′ of the hydrogen sensor 4 stored in the storage device 2 and the history power of the measurement time 1B, and stores it in the storage device 2. From the stored correlation between the exposure amount 1E and deterioration amount 1C of the hydrogen sensor 4 per predetermined time and the exposure amount 1E obtained by the above calculation, obtain the deterioration amount 1C of the hydrogen sensor 4 per predetermined time. Then, the deterioration amount of the hydrogen sensor 4 is detected by comparing the obtained deterioration amount 1C with a predetermined threshold value.

[0016] As described above, the history of the measured concentration 1A 'and measurement time 1B of the hydrogen sensor 4 is stored in the storage device 2, and the exposure amount 1E per predetermined time is calculated by the control device 3 based on this history. Ask. The storage device 2 stores the correlation between the exposure amount per predetermined time and the deterioration amount of the hydrogen sensor 4 obtained in advance by experiments or the like. The control device 3 compares the exposure amount 1E per predetermined time of the hydrogen sensor 4 used for measurement with the exposure amount per predetermined time of the hydrogen sensor 4 obtained in advance through experiments, etc. The amount of deterioration of the hydrogen sensor 4 used is determined from the above correlation. As described above, since the deterioration amount of the hydrogen sensor 4 used for the measurement is obtained from the correlation obtained in advance through experiments or the like, the deterioration amount of the hydrogen sensor 4 can be accurately known.

[0017] (Second Embodiment)

As shown in FIG. 6, the deterioration detection system 1 of the hydrogen sensor 4 according to the second embodiment of the present invention includes a hydrogen concentration measured by the hydrogen sensor 4 and a history of measurement time, and a hydrogen sensor per predetermined time. The amount of exposure per unit time of the storage device 2 that stores the correlation between the exposure amount of 4 and the deterioration amount 1C, and the historical power of the measurement concentration and measurement time 4 was determined. From the above correlation, the control device 3 for determining the deterioration amount of the hydrogen sensor 4 An alarm device 6 that issues an alarm when the deterioration amount obtained by the control device 3 exceeds a predetermined threshold value and a hydrogen concentration output device 7 that outputs the measured concentration measured by the hydrogen sensor 4 to the outside are provided. The deterioration detection system 1 according to the second embodiment further includes a hydrogen concentration output device 7 as compared with that in FIG.

[0018] The control device 3 calculates (integrates) the measurement concentration 1A 'stored in the storage device 2 and the measurement time 1B according to the equation (1) to obtain the exposure amount 1E of the hydrogen sensor 4 per predetermined time. Based on the exposure amount 1E, the deterioration amount 1 C is obtained from the correlation between the exposure amount stored in the storage device 2 and the deterioration amount. Specifically, the control device 3 corrects an operation such as addition or multiplication based on the deterioration amount 1C obtained immediately before the measured concentration of the hydrogen sensor 4, and stores the corrected hydrogen concentration 1A ′. The data is stored in the device 2 and output to the hydrogen concentration output device 7 in addition. Hydrogen concentration output device 7 outputs the input corrected hydrogen concentration 1A ′ to the outside. Therefore, the hydrogen concentration output from the hydrogen concentration output device 7 is not affected by the decrease in the measured concentration due to the deterioration of the hydrogen sensor 4. Further, when the correction value is larger than a predetermined threshold, the alarm device 6 determines that the detection element of the hydrogen sensor 4 has deteriorated and issues an alarm.

Next, a deterioration control method using the deterioration detection system 1 in FIG. 6 will be described. At the same time, the storage device 2 uses the hydrogen sensor 4 that is the target of deterioration detection to measure the hydrogen concentration in the desired atmosphere. Store the history of corrected measurement concentration 1A 'and measurement time 1B. Then, the control device 3 obtains the exposure amount 1E per predetermined time of the hydrogen sensor 4 used for the measurement as well as the history power of the measurement concentration 1A ′ and the measurement time 1B. Then, the control device 3 calculates the latest deterioration amount based on the exposure amount 1E, calculates the correction value of the measured concentration based on this deterioration amount, and the hydrogen concentration output device 7 calculates the corrected hydrogen concentration 1A ′. Output.

[0020] As described above, since the deterioration amount obtained from the correlation stored in the storage device 2 is the deterioration amount of the hydrogen sensor 4, the above correlation is applied to the output value (measured value 1A) of the hydrogen sensor 4. By applying correction with the calculated deterioration amount, the true value of the hydrogen concentration in the measurement atmosphere can be obtained with high accuracy even if the detection element of the hydrogen sensor 4 is deteriorated.

[0021] (Third embodiment)

As shown in FIG. 7, the deterioration detection system for the hydrogen sensor 4 according to the third embodiment of the present invention. As in FIG. 6, 1 is a storage device 2 that stores the measured concentration of hydrogen measured by the hydrogen sensor 4 and the history of the measurement time, and the correlation between the exposure amount and the deterioration amount of the hydrogen sensor 4 per predetermined time. And a control device 3 for determining the amount of exposure per unit time of the hydrogen sensor 4 used for measurement concentration and measurement time and measuring the amount of deterioration of the hydrogen sensor 4 based on the exposure amount and the above correlation. The alarm device 6 that issues an alarm when the deterioration amount obtained by the control device 3 exceeds a predetermined threshold, and the hydrogen concentration output device 7 that outputs the hydrogen concentration corrected by the deterioration amount of the hydrogen sensor 4 to the outside. .

In the third embodiment, the hydrogen sensor 4 is disposed adjacent to the fuel cell system 8 that generates electricity by electrochemically reacting hydrogen and oxygen. Further, adjacent to the fuel cell system 8, a ventilator 5 for ventilating at least one of the fuel cell system 8, a case surrounding the fuel cell system 8, and a vehicle equipped with the fuel cell system 8 is disposed. The hydrogen sensor 4 may be attached to a fuel cell system 8, a case including the fuel cell system 8, or a vehicle equipped with the fuel cell system 8.

[0023] The control device 3 calculates the measurement concentration 1A 'and the measurement time 1B stored in the storage device 2, and obtains the exposure amount 1E per predetermined time of the hydrogen sensor 4 as shown in FIG. The amount of 1C is corrected by adding or multiplying the measured concentration of the hydrogen sensor 4 and the corrected hydrogen concentration 1A 'is output to the hydrogen concentration output device 7. Therefore, the hydrogen concentration output from the hydrogen concentration output device 7 is not affected by the decrease in the measured concentration due to the deterioration of the hydrogen sensor 4.

[0024] The magnitude of the ventilation amount of the ventilator 5 that can ensure safety against a certain hydrogen concentration 1A 'is obtained in advance through experiments or the like. The relationship between the magnitude of the ventilation volume and the hydrogen concentration 1A ′ is stored in the storage device 2. Based on this relationship, the ventilation volume of the ventilation device 5 is controlled by the control device 3 according to the hydrogen concentration 1A ′. Also, if the hydrogen concentration 1G of the hydrogen concentration output device 7 is larger than the predetermined hydrogen concentration threshold, it is determined that the ventilator is out of order, and if the correction amount is larger than the predetermined threshold, the detection element is deteriorated. Judgment and alarm device 6 issues an alarm.

A deterioration detection method using the deterioration detection system 1 of FIG. 7 will be described with reference to FIG.

(I) First, in step S01, the hydrogen sensor 4 starts measuring the hydrogen concentration. At the same time, in step S02, the control device 3 acquires the measured concentration 1A and the measured time 1B. [0027] (ii) In step S03, the control device 3 corrects the acquired measured concentration 1A by performing arithmetic processing based on the immediately preceding deterioration amount 1C, and stores the corrected measured concentration 1A 'and the measured time 1B in the storage device 2. Remember. In step S04, the control device 3 outputs the hydrogen concentration 1A ′ subjected to the correction process to the hydrogen concentration output device 7. Calculate the exposure concentration 1E by calculating the measured concentration 1A 'corrected in step S05 and the measurement time 1B.

[0028] (iii) In step S06, the control device 3 instructs the ventilator 5 to ventilate the corrected hydrogen concentration 1A ′, and the ventilator 5 performs ventilation according to the instruction. In step S07, the control device 3 compares the correction value and the magnitude of Z or hydrogen concentration with the respective threshold values. If the correction value and the magnitude of Z or hydrogen concentration are smaller than those threshold values (NO in step S07), the process returns to step S02, and if the hydrogen concentration is greater than these threshold values (YES in step S07), the process Goes to step S08, the control device 3 gives an alarm instruction to the alarm device 6, and the alarm device 6 issues an alarm.

[0029] Figure 9 shows that when the hydrogen sensor 4 is used for concentration measurement in an atmosphere with a hydrogen concentration of X%, the hydrogen concentration output value 1G output by the hydrogen concentration output device 7 is corrected by the deterioration amount. The cases with and without are shown. When correction is not performed, as indicated by the broken line in the figure, the detection element of the hydrogen sensor 4 deteriorates despite the fact that the hydrogen concentration power of the atmosphere is%. The concentration output deviates from the hydrogen concentration X% force. However, when correction is performed, an appropriate hydrogen concentration output X% can be stably obtained regardless of the measurement time t, as indicated by the solid line in the figure.

FIG. 10 shows the relationship between the presence / absence of correction processing for the hydrogen concentration output value to the hydrogen concentration output device 7 and the ventilation volume (power consumption) of the ventilation device 5. The broken line in the figure indicates the ventilation volume when the hydrogen concentration output value is not corrected by the deterioration amount, and the solid line indicates the ventilation volume when the correction is performed. Ventilation volume (power consumption) increases when the hydrogen concentration in the space to be ventilated increases and the hydrogen concentration output value increases, to reduce the hydrogen concentration in the atmosphere to the specified value! It is necessary to let them. When the detection element of the hydrogen sensor 4 deteriorates, the measured hydrogen concentration 1A deviates from the hydrogen concentration (true value) in the measurement atmosphere. If correction is not performed, taking into account the decrease in the measured hydrogen concentration 1A due to the deterioration of the hydrogen sensor 4, the capacity of the ventilator 5 is increased with respect to the threshold value set low, and there is a sufficient ventilation volume Ensure (power consumption) Need arises. Ventilation with Ventilation Device 5 must be at a ventilation volume that matches the threshold value determined in advance in consideration of deterioration of Hydrogen Sensor 4 in order to sufficiently dilute the gas in the space to be ventilated. Even if 4 is not degraded, a large ventilation with a margin according to the above threshold is required, and the power consumption is large.

[0031] According to the third embodiment of the present invention, by performing ventilation in accordance with the corrected hydrogen concentration output 1A ', it is not necessary to set a low threshold value considering deterioration, and the deterioration amount of the hydrogen sensor 4 is reduced. Since it is not necessary to give the ventilation volume an unnecessary margin corresponding to the power consumption, the power consumption of the ventilator 5 can be reduced. Therefore, when the deterioration detection system 1 of the present embodiment is applied to a fuel cell system, the fuel gas (hydrogen gas) consumption can be reduced. In other words, power generation means using a fuel cell that does not generate excessive power consumption for ventilation, a case that accommodates the power generation means, and a ventilation device for a fuel cell vehicle are necessary for power generation that does not generate excessive power consumption. There will be no adverse effects on fuel consumption due to excessive consumption of fuel gas or the like.

[0032] Further, an appropriate hydrogen concentration can be recognized by a driver or the like using the corrected hydrogen concentration output 1G. Furthermore, when the alarm device 6 issues an alarm when the deterioration amount or the correction amount is larger than a predetermined value, it is possible to accurately notify the driver of the replacement timing of the hydrogen sensor 4 or its detection element.

[0033] Note that the hydrogen sensor 4 may include at least one of the storage device 2, the control device 3, the alarm device 6, and the hydrogen concentration output device 7 in the inside thereof. In this case, the deterioration detection system can be simplified.

[0034] As noted above, the invention is described in terms of three embodiments. It should not be understood that the discussion and drawings that form part of this disclosure limit the invention. This ability to reveal various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art. That is, it should be understood that the present invention includes various embodiments and the like as described herein. Accordingly, the present invention is limited only by the specific matters of the invention within the scope of claims reasonable from this disclosure.

Industrial applicability

[0035] According to the present invention, the concentration of the hydrogen sensor measured and the historical power of the measurement time, the amount of exposure of the hydrogen sensor per predetermined time is obtained, Based on the correlation between the amount of exposure and the amount of deterioration, the amount of deterioration of the hydrogen sensor used can be determined with high accuracy.

Claims

The scope of the claims

[1] A storage device that stores a history of measurement concentration and measurement time of hydrogen measured by the hydrogen sensor, and a correlation between the exposure amount and deterioration amount of the hydrogen sensor per predetermined time;

The amount of exposure per unit time of the hydrogen sensor used for the measurement is obtained from the measured concentration and the history of the measurement time, and the amount of deterioration of the hydrogen sensor used for the measurement is obtained from the amount of exposure and the correlation. With control device

Hydrogen sensor deterioration detection system equipped with

[2] The deterioration detection system for a hydrogen sensor according to claim 1, wherein the control device calculates the correction value of the measured concentration based on the deterioration amount obtained immediately before, and obtains the current deterioration amount of the correlation force. .

[3] The hydrogen sensor is disposed adjacent to a fuel cell system that generates electricity by electrochemically reacting hydrogen and oxygen,

The control device changes a ventilation amount of a ventilation device that ventilates at least one of the fuel cell system, a case surrounding the fuel cell system, or a vehicle equipped with the fuel cell system according to the magnitude of the correction value. The deterioration detection system for a hydrogen sensor according to claim 2.

[4] The hydrogen sensor is disposed adjacent to a fuel cell system that generates electricity by electrochemically reacting hydrogen and oxygen,

The control device is configured to ventilate at least one of the fuel cell system, a case surrounding the fuel cell system, or a vehicle equipped with the fuel cell system, depending on the corrected hydrogen concentration. The deterioration detection system for a hydrogen sensor according to claim 2, wherein the amount is changed.

[5] At least one of a warning device that issues an alarm when the deterioration amount obtained by the control device exceeds a predetermined threshold and a hydrogen concentration output device that outputs the measured concentration obtained by the hydrogen sensor is provided. The hydrogen sensor deterioration detection system according to claim 1.

6. The hydrogen sensor deterioration detection system according to claim 5, wherein the hydrogen sensor includes at least one of the storage device, the control device, the alarm device, and the hydrogen concentration output device.

[7] Start measuring hydrogen concentration using a hydrogen sensor that is subject to deterioration detection, store the measured hydrogen concentration and measurement time history measured by the hydrogen sensor, and store the measured concentration and measurement time history. To obtain the amount of exposure per unit time of the hydrogen sensor used in the measurement,

A method for detecting deterioration of a hydrogen sensor, wherein the deterioration amount of the hydrogen sensor is obtained from a correlation between an exposure amount and the deterioration amount of the hydrogen sensor per predetermined time prepared in advance.

[8] The calculated deterioration value of the measured concentration is calculated based on the immediately preceding deterioration amount before the deterioration amount is obtained, and the current deterioration amount is obtained from the correlation using the corrected hydrogen concentration. Of hydrogen sensor deterioration detection.

[9] Stores the measured hydrogen concentration and measurement time history measured by the hydrogen concentration measuring means for measuring the hydrogen concentration, and the correlation between the exposure amount and the deterioration amount of the hydrogen concentration measuring means per predetermined time. A storage device;

A control device for obtaining an exposure amount per predetermined time of the hydrogen concentration measurement means used for the measurement from the measurement concentration and the history of the measurement time, and obtaining the deterioration amount from the correlation;

A deterioration detection system for hydrogen concentration measuring means.