A method and system for measuring hydrogen concentration based on MEMS hydrogen sensor

Abstract

The present invention relates to the field of gas concentration testing technology, and in particular to a hydrogen concentration measurement method and system based on a MEMS hydrogen sensor, the method comprising: obtaining the hydrogen concentrations of a target vehicle in a plurality of different regions at different times; determining a first possibility of hydrogen leakage in the target vehicle according to the hydrogen concentration; judging whether hydrogen leakage occurs in the target vehicle according to the first possibility; determining a target time point of hydrogen leakage in the target vehicle; determining a second possibility that each MEMS hydrogen sensor in the target vehicle is on a hydrogen propagation path according to the hydrogen concentrations in each region at the target time point; determining a third possibility of a hydrogen leakage fault point according to the second possibility and the target time point; and selecting the position of the MEMS hydrogen sensor corresponding to the maximum third possibility as the hydrogen leakage fault point. In this way, the present invention can timely warn of hydrogen leakage and determine the position of the hydrogen leakage fault point.

Description

Technical Field

[0001] The present invention relates to the technical field of gas concentration testing, and in particular to a hydrogen concentration measuring method and system based on a MEMS hydrogen sensor. Background Art

[0002] Hydrogen energy has the advantages of high energy density, low carbon and environmental protection, and has been widely used in many fields. The main application case in the field of transportation is hydrogen fuel cells, which have the advantages of strong power and long battery life. However, while having huge advantages, if hydrogen leaks in a confined space such as a car, the flammable and explosive properties of hydrogen itself will pose a major safety hazard. Therefore, in the research and development of hydrogen fuel vehicles, safety needs to be the primary indicator of hydrogen fuel vehicles. Among them, monitoring the safety hazards of hydrogen fuel vehicles mainly involves monitoring the failure of hydrogen leakage.

[0003] In some scenarios, micro-electro-mechanical systems (MEMS) hydrogen sensors are often used to detect the hydrogen concentration inside the car to monitor whether a hydrogen fuel cell has leaked hydrogen. When using a MEMS hydrogen sensor to detect the hydrogen concentration inside the car, an alarm threshold is often set to compare the hydrogen concentration inside the car measured by the hydrogen sensor with the alarm threshold to determine whether a hydrogen leak has occurred and issue an alarm. However, the interior of the car is a confined space, and hydrogen leaks slowly at first, and only accumulates after a period of diffusion, causing the hydrogen concentration to increase. Therefore, if the hydrogen leak is not identified until the hydrogen concentration reaches the alarm threshold, the warning of the hydrogen leak will not be timely enough, and the location of the hydrogen leak fault point cannot be detected, which is not conducive to subsequent maintenance operations. Summary of the invention

[0004] In order to solve the technical problem that the early warning of hydrogen leakage is not timely enough and the location of the fault point of hydrogen leakage cannot be detected, the purpose of the present invention is to provide a hydrogen concentration measurement method and system based on MEMS hydrogen sensor. The technical solution adopted is as follows:

[0005] An embodiment of the present invention provides a hydrogen concentration measurement method based on a MEMS hydrogen sensor, comprising: obtaining hydrogen concentrations in a plurality of different regions of a target vehicle at different times, the hydrogen concentrations being measured by MEMS hydrogen sensors installed in each region; determining a first possibility of hydrogen leakage in the target vehicle according to the hydrogen concentrations in each region at different times; judging whether hydrogen leakage occurs in the target vehicle according to the first possibility; in the event of hydrogen leakage, determining a target time point at which hydrogen leakage occurs in the target vehicle; determining a second possibility that each MEMS hydrogen sensor in the target vehicle is located on a propagation path of hydrogen according to the hydrogen concentrations in each region at the target time point; determining a third possibility that the location of each MEMS hydrogen sensor is a hydrogen leakage fault point according to the second possibility that each MEMS hydrogen sensor is located on the propagation path of hydrogen and the target time point; and selecting the location of the MEMS hydrogen sensor corresponding to the maximum possibility as the hydrogen leakage fault point from among the third possibilities.

[0006] Optionally, the region includes a top region of the target vehicle, a bottom region of the target vehicle, and an inner region between the top region and the bottom region, and determining the first possibility of hydrogen leakage in the target vehicle according to the hydrogen concentrations of the regions at different times comprises: obtaining the first hydrogen concentration of a first MEMS hydrogen sensor located in the bottom region at the current time and at each first historical time within a predetermined time period before the current time, to obtain a hydrogen concentration set; when the maximum value in the hydrogen concentration set is the first hydrogen concentration at the current time, calculating the absolute value of the difference between the first hydrogen concentrations at adjacent times in the hydrogen concentration set, to obtain a difference sequence; and in the case where the maximum value in the hydrogen concentration set is the first hydrogen concentration at the current time, calculating the absolute value of the difference between the first hydrogen concentrations at adjacent times in the hydrogen concentration set, to obtain a difference sequence. When the maximum value in the sequence is the absolute value of the first hydrogen concentration difference between the current moment and the first historical moment before the current moment, the current moment is determined to be the target moment when the hydrogen concentration of the first MEMS hydrogen sensor increases significantly; the second hydrogen concentration difference between the target moment and the second historical moment before the target moment of the second MEMS hydrogen sensor located in the inner area is determined; the second hydrogen concentration of the third MEMS hydrogen sensor located in the top area is determined at the target moment; and the first possibility of hydrogen leakage in the target vehicle at the target moment is determined based on the second hydrogen concentration difference and the second hydrogen concentration.

[0007] Optionally, determining a first possibility of hydrogen leakage in the target vehicle at a target time point based on the second hydrogen concentration difference and the second hydrogen concentration includes: selecting a maximum hydrogen concentration difference from the second hydrogen concentration differences of the second MEMS hydrogen sensor located in the inner area; selecting a maximum hydrogen concentration from the second hydrogen concentration of the third MEMS hydrogen sensor located in the top area; and normalizing a first product of the maximum hydrogen concentration difference and the maximum hydrogen concentration using a normalization function to obtain a first possibility of hydrogen leakage in the target vehicle at the target time point.

[0008] Optionally, determining the second possibility that each MEMS hydrogen sensor in the target vehicle is on the propagation path of hydrogen based on the hydrogen concentration in each area at the target time point includes: determining a first distance from the second MEMS hydrogen sensor to the third MEMS hydrogen sensor and a first absolute value of a third hydrogen concentration difference, the third hydrogen concentration difference being the difference in hydrogen concentrations between the second MEMS hydrogen sensor and the third MEMS hydrogen sensor at the target time point; determining the second possibility that the second MEMS hydrogen sensor and the third MEMS hydrogen sensor are on the propagation path based on the first distance and the first absolute value; determining a second distance from the first MEMS hydrogen sensor to the second MEMS hydrogen sensor and a second absolute value of a fourth hydrogen concentration difference, the fourth hydrogen concentration difference being the difference in hydrogen concentrations between the first MEMS hydrogen sensor and the second MEMS hydrogen sensor at the target time point; determining the second possibility that the first MEMS hydrogen sensor and the second MEMS hydrogen sensor are on the propagation path based on the second distance and the second absolute value.

[0009] Optionally, determining a second possibility that the second MEMS hydrogen sensor and the third MEMS hydrogen sensor are on the propagation path based on the first distance and the first absolute value includes: calculating a second product between the first distance and the first absolute value; and performing negative correlation processing on the second product to obtain a second possibility that the second MEMS hydrogen sensor and the third MEMS hydrogen sensor are on the propagation path.

[0010] Optionally, determining a second possibility that the first MEMS hydrogen sensor and the second MEMS hydrogen sensor are on the propagation path based on the second distance and the second absolute value includes: calculating a third product between the second distance and the second absolute value; and performing negative correlation processing on the third product to obtain a second possibility that the first MEMS hydrogen sensor and the second MEMS hydrogen sensor are on the propagation path.

[0011] Optionally, based on the second possibility that each MEMS hydrogen sensor is on the propagation path of hydrogen and the target time point, determining the third possibility that the location of each MEMS hydrogen sensor is a hydrogen leakage fault point includes: calculating the third product between the second possibility that the second MEMS hydrogen sensor and the third MEMS hydrogen sensor are on the propagation path and the second possibility that the first MEMS hydrogen sensor and the second MEMS hydrogen sensor are on the propagation path; selecting the maximum value from the third product, and normalizing the target time point to obtain a normalized value; determining the ratio between the maximum value in the third product and the normalized value as the third possibility that the location of the MEMS hydrogen sensor is the hydrogen leakage fault point.

[0012] Optionally, judging whether hydrogen leakage occurs in the target vehicle according to the first possibility includes: determining that hydrogen leakage occurs in the target vehicle when the first possibility is greater than a first threshold.

[0013] In a second aspect, an embodiment of the present invention provides a hydrogen concentration measurement system based on a MEMS hydrogen sensor, including: an acquisition module, used to acquire the hydrogen concentration of multiple different areas of a target vehicle at different times, the hydrogen concentration being measured by MEMS hydrogen sensors installed in each area; a determination module, used to determine a first possibility of hydrogen leakage in the target vehicle according to the hydrogen concentration of each area at different times; a judgment module, used to judge whether hydrogen leakage occurs in the target vehicle according to the first possibility; the determination module is also used to determine a target time point of hydrogen leakage in the target vehicle in the event of hydrogen leakage; the determination module is also used to determine a second possibility that each MEMS hydrogen sensor in the target vehicle is on a hydrogen propagation path according to the hydrogen concentration of each area at the target time point; the determination module is also used to determine a third possibility that the location of each MEMS hydrogen sensor is a hydrogen leakage fault point according to the second possibility that each MEMS hydrogen sensor is on the hydrogen propagation path and the target time point; a selection module is used to select the location of the MEMS hydrogen sensor corresponding to the maximum possibility from each third possibility as the hydrogen leakage fault point.

[0014] In a third aspect, an embodiment of the present invention provides a hydrogen concentration measurement system based on a MEMS hydrogen sensor, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the computer program is executed by the processor, the steps of the hydrogen concentration measurement method based on the MEMS hydrogen sensor as mentioned in the first aspect are implemented.

[0015] The present invention has the following beneficial effects: firstly, the hydrogen concentrations of multiple different areas of a target vehicle at different times are obtained, and the hydrogen concentrations are measured by MEMS hydrogen sensors installed in each area; then, according to the hydrogen concentrations of each area at different times, a first possibility of hydrogen leakage in the target vehicle is determined; then, according to the first possibility, whether hydrogen leakage occurs in the target vehicle is judged; secondly, in the case of hydrogen leakage, a target time point of hydrogen leakage in the target vehicle is determined; and according to the hydrogen concentrations of each area at the time point, a second possibility that each MEMS hydrogen sensor in the target vehicle is located on the propagation path of hydrogen is determined; then, according to the second possibility that each MEMS hydrogen sensor is located on the propagation path of hydrogen and the target time point, a third possibility that the position of each MEMS hydrogen sensor is a hydrogen leakage fault point is determined; finally, from each third possibility, the position of the MEMS hydrogen sensor corresponding to the maximum possibility is selected as the hydrogen leakage fault point.

[0016] Thus, the embodiment of the present invention installs MEMS hydrogen sensors in different areas of the vehicle, and then monitors the hydrogen concentration in each area of ​​the target vehicle in real time, and comprehensively determines whether hydrogen leakage occurs in the target vehicle by the hydrogen concentration of each area at different times, thereby timely warning of hydrogen leakage. If hydrogen leakage occurs, the location of the hydrogen leakage fault point is further analyzed and determined according to the target time point of hydrogen leakage in the target vehicle, so as to facilitate subsequent maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present invention or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A flow chart of a method for measuring hydrogen concentration based on a MEMS hydrogen sensor provided by an embodiment of the present invention;

[0019] Figure 2 A schematic diagram of the module composition of a hydrogen concentration measurement system based on a MEMS hydrogen sensor provided by an embodiment of the present invention;

[0020] Figure 3 A schematic structural diagram of a hydrogen concentration measurement system based on a MEMS hydrogen sensor provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0021] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following is a detailed description of a hydrogen concentration measurement method and system based on a MEMS hydrogen sensor proposed by the present invention, its specific implementation, structure, features and effects, in combination with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures or characteristics in one or more embodiments may be combined in any suitable form.

[0022] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0023] The following is a detailed description of a method and system for measuring hydrogen concentration based on a MEMS hydrogen sensor provided by the present invention in conjunction with the accompanying drawings. Example

[0024] See also Figure 1, which shows a flow chart of a method for measuring hydrogen concentration based on a MEMS hydrogen sensor provided by an embodiment of the present invention, including:

[0025] S101, obtaining hydrogen concentrations in multiple different areas of a target vehicle at different times.

[0026] The hydrogen concentration is measured by MEMS hydrogen sensors installed in each area.

[0027] Specifically, the target vehicle refers to a vehicle equipped with a hydrogen fuel cell, and the target vehicle includes a top area, a bottom area, and an inner area between the top area and the bottom area, and MEMS hydrogen sensors are installed in the top area, the bottom area, and the inner area between the top area and the bottom area, respectively. The hydrogen concentration of each area is measured in real time by the MEMS hydrogen sensors in each area, wherein at least one MEMS hydrogen sensor can be installed in each area of ​​the target vehicle.

[0028] Furthermore, the bottom area of ​​the target vehicle may be the chassis area. In the chassis area of ​​the target vehicle, there are multiple areas where hydrogen leakage may occur, such as hydrogen storage tanks, fuel cell engines, hydrogen supply systems, etc. MEMS hydrogen sensors are deployed near each system area with high hydrogen content in the chassis area. Assuming that a total of MEMS hydrogen sensors, respectively marked as .

[0029] Furthermore, several MEMS hydrogen sensors are deployed in the interior area of ​​the target vehicle, such as the front console and each row of seats. Assuming that a total of MEMS hydrogen sensors, respectively marked as , in order to monitor the hydrogen concentration at each point in the internal area of ​​the target vehicle if a hydrogen leak occurs, in order to find the location of the hydrogen leak fault point.

[0030] Furthermore, in the top area of ​​the vehicle, since the density of hydrogen is lower than that of air, if hydrogen leaks, the leaked hydrogen will gradually diffuse upwards, and then gradually gather on the roof. If the gathering density is too high, it is very easy to cause danger. Therefore, several MEMS hydrogen sensors are deployed in the top area of ​​the vehicle. Assuming that a total of MEMS hydrogen sensors, respectively marked as It is used to monitor the hydrogen concentration on the roof if a hydrogen leak occurs. While finding the location of the hydrogen leak, it also monitors the concentration of hydrogen accumulation in order to take corresponding countermeasures to ensure vehicle safety.

[0031] It is worth noting that , as well as The specific value of can be determined according to the actual situation, such as in the embodiment of the present invention , as well as The values ​​are 5, 4, and 3 respectively.

[0032] Furthermore, the interval between adjacent moments can be set to one second, thereby achieving real-time measurement of whether hydrogen leakage occurs in the vehicle. By deploying a number of MEMS hydrogen sensors in various areas of the vehicle, the hydrogen concentration in each area of ​​the vehicle is obtained every one second.

[0033] S102, determining a first possibility of hydrogen leakage in the target vehicle according to the hydrogen concentrations in each area at different times.

[0034] Specifically, if hydrogen leakage begins to occur at a certain location in the target vehicle, the hydrogen concentration at that location and its surroundings will begin to increase first. In hydrogen fuel vehicles, systems involving hydrogen can all be built in the chassis area of ​​the vehicle. Therefore, it is possible to first determine whether a hydrogen leak has occurred and find the hydrogen leakage fault point based on the changes in the hydrogen concentration measured by each MEMS hydrogen sensor deployed in the chassis area. If there is no hydrogen leakage in the target vehicle, the hydrogen concentration measured by each MEMS hydrogen sensor should continue to remain at a stable value with a small fluctuation range. If a hydrogen leak occurs, the hydrogen concentration around the location of the hydrogen leak will increase significantly. Therefore, the first possibility of a hydrogen leak in the target vehicle can be determined based on the increase in the hydrogen concentration measured by each MEMS hydrogen sensor.

[0035] Further, when determining the first possibility of hydrogen leakage in the target vehicle, firstly, the first hydrogen concentration of the first MEMS hydrogen sensor located in the bottom area at the current moment and at each first historical moment within a predetermined time period before the current moment is obtained to obtain a hydrogen concentration set; then, when the maximum value in the hydrogen concentration set is the first hydrogen concentration at the current moment, the absolute value of the difference between the first hydrogen concentrations at adjacent moments in the hydrogen concentration set is calculated to obtain a difference sequence; secondly, when the maximum value in the difference sequence is the absolute value of the difference between the first hydrogen concentrations at the current moment and the first historical moment before the current moment, the current moment is determined to be a target moment point when a substantial increase in hydrogen concentration occurs in the first MEMS hydrogen sensor; and the second hydrogen concentration difference between the second MEMS hydrogen sensor located in the inner area at the target moment and the second historical moment before the target moment is determined; and the second hydrogen concentration of the third MEMS hydrogen sensor located in the top area at the target moment is determined; finally, the first possibility of hydrogen leakage in the target vehicle at the target moment is determined based on the second hydrogen concentration difference and the second hydrogen concentration.

[0036] Specifically, the predetermined time period can be determined according to actual conditions, and in the embodiment of the present invention, the value is 30 seconds. A MEMS hydrogen sensor is provided. In the embodiment of the present invention, the first MEMS hydrogen sensor in the bottom area is taken as an example to illustrate whether hydrogen leakage occurs in the vehicle.

[0037] First, the first hydrogen concentration of the first MEMS hydrogen sensor located in the bottom area at the current moment and at each first historical moment in a predetermined time period before the current moment is obtained to obtain a hydrogen concentration set, which is recorded as the hydrogen concentration set in the embodiment of the present invention. ,in, Indicates a moment, When the value is 1 to 30, it means it is the first historical moment before the current moment. When the value is 31, it indicates the current time.

[0038] Then, based on the obtained hydrogen concentration set at the current moment and within 30 seconds before the current moment, it is judged whether the hydrogen concentration at the current moment has increased significantly. The judgment criteria are whether a larger value appears in the hydrogen concentration set and whether the increase in hydrogen concentration between the current moment and the previous moment is greater than the increase in hydrogen concentration at the previous adjacent moment. The hydrogen concentration set obtained by the above embodiment of the present invention is recorded as If the set The hydrogen concentration at the current moment is The maximum value in Then further according to this set The hydrogen concentrations in the first two columns are subtracted one by one to obtain the difference sequence of the first hydrogen concentration, that is, . Indicates The hydrogen concentration at each moment With The hydrogen concentration at each moment The absolute value of the difference between the absolute value of the difference reflects the degree of change in hydrogen concentration. If the most recent change in hydrogen concentration of the first MEMS hydrogen sensor is the maximum change during this period, that is, . It can be considered that the hydrogen concentration measured by the first MEMS hydrogen sensor in the bottom area has increased significantly at the current moment. The moment when the hydrogen concentration increases significantly is the target moment. According to the above embodiment of the present invention, all the bottom areas of the target vehicle are The MEMS hydrogen sensors are used for real-time judgment, and the time points when the values ​​of each MEMS hydrogen sensor rise sharply are recorded. .

[0039] Furthermore, during the normal driving of the target vehicle, the various hydrogen systems in the bottom area of ​​the target vehicle are in operation. Before some hydrogen participates in the reaction, it will also affect the value changes of the MEMS hydrogen sensors located in the internal area and the top area of ​​the target vehicle to a certain extent. Therefore, the above-mentioned embodiment of the present invention only judges whether a hydrogen leak occurs based on whether the value of the MEMS hydrogen sensor increases significantly, which is a bit one-sided. Further analysis found that if a hydrogen leak occurs, because the density of hydrogen is less than that of air, the hydrogen will slowly rise after the leak, pass through the space inside the car, rise to the roof, and then begin to gather on the roof, forming a propagation path from the chassis area to the interior area, and then from the interior area to the roof area. Therefore, the value changes of the MEMS hydrogen sensors in the interior area and the roof area can be combined to judge whether a hydrogen leak occurs and find the hydrogen leak fault point.

[0040] Furthermore, for the internal area of ​​the target vehicle MEMS hydrogen sensors, take one of the MEMS hydrogen sensors as an example, and obtain the hydrogen concentration read at the target time point T, recorded as , the hydrogen concentration read one second before the target time point T is recorded as The increase value of the hydrogen concentration at the current target time point T compared with that obtained one second before (i.e., the second hydrogen concentration difference) is recorded as . Calculate the internal area of ​​the target vehicle The maximum value of the growth of hydrogen concentration in the MEMS hydrogen sensor is recorded as For the top area of ​​the target vehicle MEMS hydrogen sensors are used to obtain the maximum value of hydrogen concentration read by all T MEMS sensors at the target time point T and record it as .

[0041] Furthermore, when determining the first possibility of hydrogen leakage of the target vehicle at the target time point, the maximum hydrogen concentration difference is first selected from the second hydrogen concentration difference of the second MEMS hydrogen sensor located in the inner area; then the maximum hydrogen concentration is selected from the second hydrogen concentration of the third MEMS hydrogen sensor located in the top area; finally, the first product of the maximum hydrogen concentration difference and the maximum hydrogen concentration is normalized using a normalization function to obtain the first possibility of hydrogen leakage of the target vehicle at the target time point.

[0042] Specifically, the first possibility can be determined by the following formula: In the above formula, Indicates the first possibility that hydrogen leakage occurs in the target vehicle at the target time point T. The target vehicle's internal area The maximum value of the growth value of the hydrogen concentration in the MEMS hydrogen sensors, that is, the maximum hydrogen concentration difference, indicates the degree to which hydrogen begins to diffuse in the target vehicle. is the top area of ​​the target vehicle The MEMS sensor reads the maximum value of the hydrogen concentration at the target time point T, that is, the maximum hydrogen concentration, which indicates the degree to which hydrogen begins to accumulate in the roof area. is a normalization function used to The results are attributed to Within the range. Taking into account the degree of hydrogen diffusion inside the target vehicle and the degree of hydrogen accumulation on the roof, the larger the value is, the higher the first possibility that a hydrogen leak has occurred at time T.

[0043] S103: Determine whether hydrogen leakage occurs in the target vehicle based on the first possibility.

[0044] Specifically, the first possibility It comprehensively indicates the possibility of hydrogen leakage at time T. Under normal circumstances, there should be no hydrogen inside the target vehicle. As long as there is a little hydrogen diffusion and accumulation in the vehicle, leakage has occurred. Therefore, a first threshold can be set. When the first possibility is greater than the first threshold, it is determined that hydrogen leakage has occurred in the target vehicle. Among them, the first threshold Can be slightly larger than the normalized function The lower limit value is 0.5, thereby improving the judgment accuracy of hydrogen leakage, such as the first threshold value in the embodiment of the present invention. .like , it can be considered that hydrogen leakage has occurred at time T, and it is necessary to stop the vehicle immediately in a safe location and contact relevant personnel for repair and rescue.

[0045] S104, in the event of hydrogen leakage, determining a target time point at which hydrogen leakage occurs in the target vehicle.

[0046] Further, after determining that hydrogen leakage occurs in the target vehicle through the above step S103, the time when the hydrogen leakage occurs is determined as the target time point. Then, based on the hydrogen concentrations in the top area, the inner area, and the bottom area at the target time point, the second possibility that each MEMS hydrogen sensor in the target vehicle is located on the propagation path of hydrogen is determined.

[0047] S105 , determining a second possibility that each MEMS hydrogen sensor in the target vehicle is located on a propagation path of hydrogen based on the hydrogen concentration in each area at a time point.

[0048] Specifically, the troubleshooting of hydrogen leakage fault points is to check the location of the MEMS hydrogen sensor where the hydrogen concentration suddenly increases significantly in the bottom area of ​​the target vehicle. After analysis, the present invention knows that the location where the hydrogen leakage occurs will show an increase in hydrogen concentration earlier, and as the hydrogen rises, the hydrogen concentration of other MEMS hydrogen sensors close to the hydrogen leakage location will also increase significantly. Therefore, the hydrogen diffusion path can be reversed according to the direction of the roof area, the interior area, and the chassis area, and the hydrogen leakage location can be determined in combination with the hydrogen leakage time.

[0049] Furthermore, according to the hydrogen concentration in each area at the target time point, a first distance from the second MEMS hydrogen sensor to the third MEMS hydrogen sensor and a first absolute value of the third hydrogen concentration difference are determined, and the third hydrogen concentration difference is the difference in hydrogen concentration between the second MEMS hydrogen sensor and the third MEMS hydrogen sensor at the target time point; according to the first distance and the first absolute value, a second possibility that the second MEMS hydrogen sensor and the third MEMS hydrogen sensor are on the propagation path is determined; a second distance from the first MEMS hydrogen sensor to the second MEMS hydrogen sensor and a second absolute value of the fourth hydrogen concentration difference are determined, and the fourth hydrogen concentration difference is the difference in hydrogen concentration between the first MEMS hydrogen sensor and the second MEMS hydrogen sensor at the target time point; according to the second distance and the second absolute value, a second possibility that the first MEMS hydrogen sensor and the second MEMS hydrogen sensor are on the propagation path is determined.

[0050] Specifically, the target time point at which the hydrogen concentration in the bottom area of ​​the target vehicle rises sharply has been obtained through the above-mentioned embodiment of the present invention. If it is determined that hydrogen leakage has occurred at time T, the hydrogen concentrations measured by the MEMS hydrogen sensors at time T are used to obtain the MEMS hydrogen sensor with the maximum hydrogen concentration from the MEMS hydrogen sensors in the roof area (assuming that the MEMS hydrogen sensor is marked as ) location, first search for possible locations in the propagation path among the MEMS hydrogen sensors in the inner area of ​​the target vehicle.

[0051] More specifically, it is determined whether the MEMS hydrogen sensors in the inner area of ​​the target vehicle are in the propagation path, and the MEMS hydrogen sensors in the inner area of ​​the target vehicle are obtained respectively. MEMS hydrogen sensor to the roof area The first distance between , the first absolute value of the third hydrogen concentration difference between the hydrogen concentrations of the MEMS hydrogen sensor is recorded as . It is judged whether the MEMS hydrogen sensor in the bottom area of ​​the target vehicle is in the propagation path, and the MEMS hydrogen sensors in the bottom area of ​​the target vehicle are obtained respectively. to each MEMS hydrogen sensor in the interior area of ​​the target vehicle The second distance between The second absolute value of the difference in hydrogen concentration between the MEMS hydrogen sensors is recorded as .

[0052] Furthermore, when determining the second possibility that the second MEMS hydrogen sensor and the third MEMS hydrogen sensor are on the propagation path, the second product between the first distance and the first absolute value is first calculated; then the second product is negatively correlated to obtain the second possibility that the second MEMS hydrogen sensor and the third MEMS hydrogen sensor are on the propagation path.

[0053] Specifically, the second possibility that the second MEMS hydrogen sensor and the third MEMS hydrogen sensor are on the propagation path can be expressed by the following formula: In the above formula, Indicates the first A second possibility is that the first MEMS hydrogen sensor and the third MEMS hydrogen sensor are on the propagation path. Individual MEMS hydrogen sensors representing the interior area of ​​a target vehicle MEMS hydrogen sensor to the roof area The first distance between. A first absolute value representing a third hydrogen concentration difference between hydrogen concentrations of the MEMS hydrogen sensors. represents the natural exponential function, which is used to Negative correlation processing. Representation of a MEMS hydrogen sensor located in the interior area of ​​a target vehicle The smaller the first distance between the sensor and the third MEMS hydrogen sensor, the smaller the first absolute value of the third hydrogen concentration difference. The larger the value is and the closer it is to 1, the more likely it is that the second MEMS hydrogen sensor and the third MEMS hydrogen sensor are in the same propagation path.

[0054] Furthermore, when determining the second possibility that the first MEMS hydrogen sensor and the second MEMS hydrogen sensor are on the propagation path, the third product between the second distance and the second absolute value is first calculated; then the third product is negatively correlated to obtain the second possibility that the first MEMS hydrogen sensor and the second MEMS hydrogen sensor are on the propagation path.

[0055] Specifically, the second possibility that the first MEMS hydrogen sensor and the second MEMS hydrogen sensor are on the propagation path can be expressed by the following formula: In the above formula, is the kth first MEMS hydrogen sensor located in the bottom area of ​​the vehicle and the kth first MEMS hydrogen sensor located in the inner area of ​​the target vehicle. A second possibility is that a second MEMS hydrogen sensor is located on the propagation path. Individual MEMS hydrogen sensors for the underbody area of ​​the target vehicle to each MEMS hydrogen sensor in the interior area of ​​the target vehicle The second distance between. is a second absolute value of the difference in hydrogen concentration between the MEMS hydrogen sensors. represents the natural exponential function, which is used to Negative correlation processing. Figure 2 shows a MEMS hydrogen sensor located in the underbody area of ​​a target vehicle. The smaller the second distance from the second MEMS hydrogen sensor, the smaller the second absolute value of the fourth hydrogen concentration difference. The larger the value is and the closer it is to 1, the more likely it is that the first MEMS hydrogen sensor and the second MEMS hydrogen sensor are in the same propagation path.

[0056] S106 , determining a third possibility that the location of each MEMS hydrogen sensor is a hydrogen leakage fault point based on the second possibility that each MEMS hydrogen sensor is located on a hydrogen propagation path and the target time point.

[0057] Specifically, under normal circumstances, the hydrogen system of a vehicle is often set in the bottom area of ​​the car. Therefore, the embodiment of the present invention can check the MEMS hydrogen sensors located in the bottom area of ​​the target vehicle. The third possibility of determining that the location of each MEMS hydrogen sensor is the hydrogen leakage fault point can be the third possibility of determining that the location of the MEMS hydrogen sensor located in the bottom area of ​​the target vehicle is the hydrogen leakage fault point.

[0058] Furthermore, when determining the third possibility, first calculate the third product between the second possibility that the second MEMS hydrogen sensor and the third MEMS hydrogen sensor are on the propagation path and the second possibility that the first MEMS hydrogen sensor and the second MEMS hydrogen sensor are on the propagation path; then select the maximum value from the third product, and normalize the target time point to obtain a normalized value; finally, determine the ratio between the maximum value in the third product and the normalized value as the third possibility that the location of the MEMS hydrogen sensor is the hydrogen leakage fault point.

[0059] Specifically, the embodiment of the present invention takes the location of the kth MEMS hydrogen sensor in the bottom area of ​​the target vehicle as an example, and the third possibility can be expressed by the following formula: In the above formula, Indicates the bottom area of ​​the target vehicle. The third possibility that the location of the MEMS hydrogen sensor is the hydrogen leakage fault point is: express is the kth first MEMS hydrogen sensor located in the bottom area of ​​the vehicle and the kth first MEMS hydrogen sensor located in the inner area of ​​the target vehicle. A second possibility is that a second MEMS hydrogen sensor is located on the propagation path. Indicates the first The second possibility that the first MEMS hydrogen sensor and the third MEMS hydrogen sensor are on the propagation path. MAX is the maximum value function, indicating that the first The kth MEMS hydrogen sensor is the most likely hydrogen propagation source of the MEMS hydrogen sensor with the highest hydrogen concentration in the roof area. The larger the value, the more likely the kth MEMS hydrogen sensor in the bottom area is to be the hydrogen leakage fault point. The first The target time point when the value of the hydrogen sensor rises sharply, the smaller the value, the lower the value. The earlier the value of a MEMS hydrogen sensor rises, the more likely it is a hydrogen leakage fault point. norm is a normalization function, which is used to Normalization is performed. It should be noted that due to Not 0, does not exist after normalization The case of 0.

[0060] S107 , selecting the position of the MEMS hydrogen sensor corresponding to the greatest possibility from among the third possibilities as the hydrogen leakage fault point.

[0061] Specifically, through the analysis of the above embodiment of the present invention, in summary, The probability that the kth MEMS hydrogen sensor in the bottom area is a hydrogen leakage fault point is comprehensively represented. The quantitative values ​​of all MEMS hydrogen sensors in the bottom area are calculated. , take the maximum value, that is, the maximum possibility, and get the location that is most likely to be the hydrogen leakage fault point. Record this location as the hydrogen leakage fault point and report it to the system, and promptly send an alarm to the car owner, suggesting that the car owner find a safe location to park, open the window for ventilation, seek help from professionals, and repair the hydrogen leakage fault point.

[0062] The embodiment of the present invention installs MEMS hydrogen sensors in different areas of the vehicle, and then monitors the hydrogen concentration in each area of ​​the target vehicle in real time, and comprehensively determines whether hydrogen leakage occurs in the target vehicle, thereby timely warning of hydrogen leakage. If hydrogen leakage occurs, the location of the hydrogen leakage fault point is further analyzed and determined according to the target time point of hydrogen leakage in the target vehicle, so as to facilitate subsequent maintenance.

[0063] Embodiment 2:

[0064] The hydrogen concentration measurement method based on the MEMS hydrogen sensor provided in the above embodiment is based on the same technical concept, such as Figure 2 As shown, the embodiment of the present invention also provides a hydrogen concentration measurement system 200 based on a MEMS hydrogen sensor, including: an acquisition module 201, used to obtain the hydrogen concentration of multiple different areas of a target vehicle at different times, and the hydrogen concentration is measured by a MEMS hydrogen sensor installed in each area; a determination module 202, used to determine a first possibility of hydrogen leakage in the target vehicle according to the hydrogen concentration of each area at different times; a judgment module 203, used to judge whether hydrogen leakage occurs in the target vehicle according to the first possibility; the determination module 202 is also used to determine the target vehicle in the event of hydrogen leakage. a target time point at which hydrogen leakage occurs in the vehicle; a determination module 202 is further used to determine a second possibility that each MEMS hydrogen sensor in the target vehicle is on a propagation path of hydrogen based on the hydrogen concentration in each area at the target time point; the determination module 202 is further used to determine a third possibility that the location of each MEMS hydrogen sensor is a hydrogen leakage fault point based on the second possibility that each MEMS hydrogen sensor is on the propagation path of hydrogen and the target time point; a selection module 204 is used to select the location of the MEMS hydrogen sensor corresponding to the greatest possibility as the hydrogen leakage fault point from each third possibility.

[0065] The embodiment of the present invention installs MEMS hydrogen sensors in different areas of the vehicle, and then monitors the hydrogen concentration in each area of ​​the target vehicle in real time, and comprehensively determines whether hydrogen leakage occurs in the target vehicle, thereby timely warning of hydrogen leakage. If hydrogen leakage occurs, the location of the hydrogen leakage fault point is further analyzed and determined according to the target time point of hydrogen leakage in the target vehicle, so as to facilitate subsequent maintenance.

[0066] Optionally, the determination module 202 is further used to obtain the first hydrogen concentration of the first MEMS hydrogen sensor located in the bottom area at the current moment and at each first historical moment within a predetermined time period before the current moment, to obtain a hydrogen concentration set; when the maximum value in the hydrogen concentration set is the first hydrogen concentration at the current moment, calculate the absolute value of the difference between the first hydrogen concentrations at adjacent moments in the hydrogen concentration set to obtain a difference sequence; when the maximum value in the difference sequence is the absolute value of the difference between the first hydrogen concentrations at the current moment and a first historical moment before the current moment, determine that the current moment is a target moment point at which a substantial increase in hydrogen concentration occurs in the first MEMS hydrogen sensor; determine the second hydrogen concentration difference between the second MEMS hydrogen sensor located in the inner area at the target moment and a second historical moment before the target moment; determine the second hydrogen concentration of the third MEMS hydrogen sensor located in the top area at the target moment; and determine a first possibility of hydrogen leakage occurring in the target vehicle at the target moment based on the second hydrogen concentration difference and the second hydrogen concentration.

[0067] Optionally, the determination module 202 is further used to select a maximum hydrogen concentration difference from the second hydrogen concentration difference of the second MEMS hydrogen sensor located in the inner area; select a maximum hydrogen concentration from the second hydrogen concentration of the third MEMS hydrogen sensor located in the top area; and use a normalization function to normalize the maximum hydrogen concentration difference and the first product of the maximum hydrogen concentration to obtain a first possibility of hydrogen leakage occurring in the target vehicle at a target time point.

[0068] Optionally, the determination module 202 is further used to determine a first distance between the second MEMS hydrogen sensor and the third MEMS hydrogen sensor and a first absolute value of a third hydrogen concentration difference, where the third hydrogen concentration difference is the difference in hydrogen concentration between the second MEMS hydrogen sensor and the third MEMS hydrogen sensor at a target time point; determine a second possibility that the second MEMS hydrogen sensor and the third MEMS hydrogen sensor are on a propagation path based on the first distance and the first absolute value; determine a second distance between the first MEMS hydrogen sensor and the second MEMS hydrogen sensor and a second absolute value of a fourth hydrogen concentration difference, where the fourth hydrogen concentration difference is the difference in hydrogen concentration between the first MEMS hydrogen sensor and the second MEMS hydrogen sensor at a target time point; determine a second possibility that the first MEMS hydrogen sensor and the second MEMS hydrogen sensor are on a propagation path based on the second distance and the second absolute value.

[0069] Optionally, the determination module 202 is further configured to calculate a second product between the first distance and the first absolute value; and perform negative correlation processing on the second product to obtain a second possibility that the second MEMS hydrogen sensor and the third MEMS hydrogen sensor are on the propagation path.

[0070] Optionally, the determination module 202 is further configured to calculate a third product between the second distance and the second absolute value; and perform negative correlation processing on the third product to obtain a second possibility that the first MEMS hydrogen sensor and the second MEMS hydrogen sensor are on the propagation path.

[0071] Optionally, the determination module 202 is further used to calculate a third product between a second possibility that the second MEMS hydrogen sensor and the third MEMS hydrogen sensor are on the propagation path and a second possibility that the first MEMS hydrogen sensor and the second MEMS hydrogen sensor are on the propagation path; select a maximum value from the third product, and normalize the target time point to obtain a normalized value; determine the ratio between the maximum value in the third product and the normalized value as the third possibility that the location of the MEMS hydrogen sensor is a hydrogen leakage fault point.

[0072] Optionally, the judgment module 203 is further configured to determine that hydrogen leakage occurs in the target vehicle when the first possibility is greater than a first threshold.

[0073] Embodiment three:

[0074] Corresponding to the hydrogen concentration measurement method based on the MEMS hydrogen sensor provided in the above embodiment, based on the same technical concept, the embodiment of the present invention also provides a hydrogen concentration measurement system based on the MEMS hydrogen sensor, and the hydrogen concentration measurement system based on the MEMS hydrogen sensor is used to execute the hydrogen concentration measurement method based on the MEMS hydrogen sensor. Figure 3 A schematic diagram of a hydrogen concentration measurement system based on a MEMS hydrogen sensor is provided to implement various embodiments of the present invention. Figure 3 As shown in the hardware level, the hydrogen concentration measurement system based on the MEMS hydrogen sensor includes a processor, and optionally, an internal bus, a network interface, and a memory. The memory may include a memory, such as a high-speed random access memory (RAM), and may also include a non-volatile memory (non-volatile memory), such as at least one disk storage. Of course, the hydrogen concentration measurement system based on the MEMS hydrogen sensor may also include hardware required for other services.

[0075] The processor, network interface and memory can be interconnected through an internal bus, which can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, only one bidirectional arrow is used in the figure, but it does not mean that there is only one bus or one type of bus.

[0076] The memory is used to store programs. Specifically, the program may include program code, and the program code includes computer operation commands. The memory may include internal memory and non-volatile memory, and provide instructions and data to the processor.

[0077] The processor reads the corresponding computer program from the non-volatile memory into the memory and then runs it, forming a device for locating the specified user at the logical level. The processor executes the program stored in the memory and is specifically used to execute: Figure 3 The method disclosed in the illustrated embodiment implements the functions and beneficial effects of each method in the previous method embodiments, which will not be described in detail here.

[0078] It should be noted that the hydrogen concentration measurement system based on the MEMS hydrogen sensor provided in the embodiment of the present invention and the hydrogen concentration measurement method based on the MEMS hydrogen sensor provided in the embodiment of the present invention are based on the same inventive concept. Therefore, the specific implementation of this embodiment can refer to the implementation of the aforementioned hydrogen concentration measurement method based on the MEMS hydrogen sensor, and has the same or similar beneficial effects, and the repeated parts will not be repeated.

[0079] It should be noted that the sequence of the above embodiments of the present invention is only for description and does not represent the advantages and disadvantages of the embodiments. The processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0080] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

Claims

1. A method for measuring hydrogen concentration based on a MEMS hydrogen sensor, characterized in that: The hydrogen concentration measurement method based on the MEMS hydrogen sensor includes: Obtaining hydrogen concentrations at different times in a plurality of different regions of a target vehicle, wherein the hydrogen concentrations are measured by MEMS hydrogen sensors installed in each of the regions; Determining a first possibility of hydrogen leakage in the target vehicle according to the hydrogen concentrations in each of the regions at different times; Determining whether hydrogen leakage occurs in the target vehicle according to the first possibility; In the event of a hydrogen leak, determining a target time point at which the hydrogen leak occurs in the target vehicle; Determining a second possibility that each of the MEMS hydrogen sensors in the target vehicle is located on a propagation path of hydrogen based on the hydrogen concentration in each of the regions at the target time point; According to the second possibility that each of the MEMS hydrogen sensors is located on a propagation path of hydrogen and the target time point, determining a third possibility that the location of each of the MEMS hydrogen sensors is a hydrogen leakage fault point; Selecting the position of the MEMS hydrogen sensor corresponding to the greatest possibility from among the third possibilities as the hydrogen leakage fault point; The region includes a top region of the target vehicle, a bottom region of the target vehicle, and an inner region between the top region and the bottom region, and determining the first possibility of hydrogen leakage in the target vehicle according to hydrogen concentrations in each of the regions at different times includes: Acquire a first hydrogen concentration of a first MEMS hydrogen sensor located in the bottom area at a current moment and at each first historical moment within a predetermined time period before the current moment to obtain a hydrogen concentration set; When the maximum value in the hydrogen concentration set is the first hydrogen concentration at the current moment, calculating the absolute value of the difference between the first hydrogen concentrations at adjacent moments in the hydrogen concentration set to obtain a difference sequence; When the maximum value in the difference sequence is the absolute value of the first hydrogen concentration difference between the current moment and a first historical moment before the current moment, determining the current moment as a target moment when the hydrogen concentration of the first MEMS hydrogen sensor increases significantly; Determine a second hydrogen concentration difference value of a second MEMS hydrogen sensor located in the inner area between the target time point and a second historical time point before the target time point; Determine a second hydrogen concentration of a third MEMS hydrogen sensor located in the top area at the target time point; A first possibility that hydrogen leakage occurs in the target vehicle at the target time point is determined according to the second hydrogen concentration difference and the second hydrogen concentration.

2. The method for measuring hydrogen concentration based on a MEMS hydrogen sensor according to claim 1, characterized in that: The first possibility of determining the hydrogen leakage of the target vehicle at the target time point according to the second hydrogen concentration difference and the second hydrogen concentration includes: Selecting a maximum hydrogen concentration difference from the second hydrogen concentration differences of the second MEMS hydrogen sensors located in the inner area; Selecting a maximum hydrogen concentration from the second hydrogen concentrations of the third MEMS hydrogen sensor located in the top area; The maximum hydrogen concentration difference and the first product of the maximum hydrogen concentration are normalized by using a normalization function to obtain a first possibility that hydrogen leakage occurs in the target vehicle at the target time point.

3. The method for measuring hydrogen concentration based on a MEMS hydrogen sensor according to claim 1, characterized in that: The second possibility of determining that each of the MEMS hydrogen sensors in the target vehicle is on the propagation path of hydrogen according to the hydrogen concentration of each of the regions at the target time point includes: Determine a first distance between the second MEMS hydrogen sensor and the third MEMS hydrogen sensor and a first absolute value of a third hydrogen concentration difference, where the third hydrogen concentration difference is a difference between the hydrogen concentrations of the second MEMS hydrogen sensor and the third MEMS hydrogen sensor at the target time point; determining a second possibility that the second MEMS hydrogen sensor and the third MEMS hydrogen sensor are on the propagation path according to the first distance and the first absolute value; Determine a second distance between the first MEMS hydrogen sensor and the second MEMS hydrogen sensor and a second absolute value of a fourth hydrogen concentration difference, where the fourth hydrogen concentration difference is a difference between the hydrogen concentrations of the first MEMS hydrogen sensor and the second MEMS hydrogen sensor at the target time point; A second possibility that the first MEMS hydrogen gas sensor and the second MEMS hydrogen gas sensor are on the propagation path is determined according to the second distance and the second absolute value.

4. The method for measuring hydrogen concentration based on a MEMS hydrogen sensor according to claim 3, characterized in that: The second possibility of determining that the second MEMS hydrogen sensor and the third MEMS hydrogen sensor are on the propagation path according to the first distance and the first absolute value includes: calculating a second product between the first distance and the first absolute value; A negative correlation process is performed on the second product to obtain a second possibility that the second MEMS hydrogen sensor and the third MEMS hydrogen sensor are on the propagation path.

5. The method for measuring hydrogen concentration based on a MEMS hydrogen sensor according to claim 3, characterized in that: The second possibility of determining that the first MEMS hydrogen sensor and the second MEMS hydrogen sensor are on the propagation path according to the second distance and the second absolute value includes: calculating a third product between the second distance and the second absolute value; A negative correlation process is performed on the third product to obtain a second possibility that the first MEMS hydrogen sensor and the second MEMS hydrogen sensor are on the propagation path.

6. The method for measuring hydrogen concentration based on a MEMS hydrogen sensor according to claim 5, characterized in that: The third possibility of determining that the position of each MEMS hydrogen sensor is a hydrogen leakage fault point according to the second possibility that each MEMS hydrogen sensor is on the propagation path of hydrogen and the target time point includes: calculating a third product between a second likelihood that the second MEMS hydrogen gas sensor and the third MEMS hydrogen gas sensor are on the propagation path and a second likelihood that the first MEMS hydrogen gas sensor and the second MEMS hydrogen gas sensor are on the propagation path; Selecting a maximum value from the third product, and normalizing the target time point to obtain a normalized value; Determine a ratio between a maximum value in the third product and the normalized value as a third possibility that the location of the MEMS hydrogen sensor is a hydrogen leakage fault point.

7. The method for measuring hydrogen concentration based on a MEMS hydrogen sensor according to claim 1, characterized in that: The determining whether hydrogen leakage occurs in the target vehicle according to the first possibility includes: When the first possibility is greater than a first threshold, it is determined that hydrogen leakage occurs in the target vehicle.

8. A hydrogen concentration measurement system based on a MEMS hydrogen sensor, characterized in that: include: An acquisition module, used to acquire hydrogen concentrations in a plurality of different areas of a target vehicle at different times, wherein the hydrogen concentrations are measured by MEMS hydrogen sensors installed in each of the areas; A determination module, configured to determine a first possibility of hydrogen leakage in the target vehicle according to the hydrogen concentrations in each of the regions at different times; A judging module, configured to judge whether hydrogen leakage occurs in the target vehicle according to the first possibility; The determination module is further used to determine a target time point at which hydrogen leakage occurs in the target vehicle in the event of hydrogen leakage; The determination module is further used to determine a second possibility that each of the MEMS hydrogen sensors in the target vehicle is located on a propagation path of hydrogen according to the hydrogen concentration of each of the regions at the target time point; The determination module is further configured to determine a third possibility that the location of each MEMS hydrogen sensor is a hydrogen leakage fault point based on the second possibility that each MEMS hydrogen sensor is on a hydrogen propagation path and the target time point; A selection module, configured to select the position of the MEMS hydrogen sensor corresponding to the greatest possibility from among the third possibilities as the hydrogen leakage fault point; The region includes a top region of the target vehicle, a bottom region of the target vehicle, and an inner region between the top region and the bottom region, and determining the first possibility of hydrogen leakage in the target vehicle according to hydrogen concentrations in each of the regions at different times includes: Acquire a first hydrogen concentration of a first MEMS hydrogen sensor located in the bottom area at a current moment and at each first historical moment within a predetermined time period before the current moment to obtain a hydrogen concentration set; When the maximum value in the hydrogen concentration set is the first hydrogen concentration at the current moment, calculating the absolute value of the difference between the first hydrogen concentrations at adjacent moments in the hydrogen concentration set to obtain a difference sequence; When the maximum value in the difference sequence is the absolute value of the first hydrogen concentration difference between the current moment and a first historical moment before the current moment, determining the current moment as a target moment when the hydrogen concentration of the first MEMS hydrogen sensor increases significantly; Determine a second hydrogen concentration difference value of a second MEMS hydrogen sensor located in the inner area between the target time point and a second historical time point before the target time point; Determine a second hydrogen concentration of a third MEMS hydrogen sensor located in the top area at the target time point; A first possibility that hydrogen leakage occurs in the target vehicle at the target time point is determined according to the second hydrogen concentration difference and the second hydrogen concentration.

9. A hydrogen concentration measurement system based on a MEMS hydrogen sensor, characterized in that: The method comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein when the computer program is executed by the processor, the steps of the hydrogen concentration measurement method based on a MEMS hydrogen sensor as described in any one of claims 1 to 7 are implemented.

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