CN115752906A - CO2 leakage amount detection method - Google Patents
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- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
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- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F22/00—Methods or apparatus for measuring volume of fluids or fluent solid material, not otherwise provided for
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
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Abstract
The invention provides a method for detecting CO2 leakage amount, which comprises the steps of responding to a leakage triggering detection instruction, carrying out leakage detection on a refrigerant and determining whether the refrigerant leaks or not; if the refrigerant leaks, calculating the leakage amount of CO2 in the refrigerant; if the refrigerant has not leaked, the refrigerant leakage detection is stopped. Therefore, the invention can test the leakage amount of the refrigerant of the CO2 refrigeration and heat pump device under the static working condition by using the necessary sensor in the original CO2 system under the condition of not increasing any detection equipment, thereby achieving the effects of leakage prompting, leakage early warning and shutdown protection. In addition, the invention well solves the problems of detection and judgment of the leakage amount of the CO2 refrigeration and heat pump device system, and can accurately judge the refrigerant leakage amount in both qualitative and quantitative aspects. Meanwhile, the detection and judgment can be in a system static state, starting equipment is not needed, and more auxiliary detection equipment is not needed.
Description
Technical Field
The invention relates to the technical field of gas detection, in particular to a method for detecting CO2 leakage.
Background
With the increasing demand for environmental protection, people are more aware of the necessity of refrigerant replacement, and the use of CO2 refrigerant has been gradually expanded from the original industrial field to the automotive field. In europe, CO2 is already in mass production as a refrigerant for an air conditioner of an automobile and is gradually being accepted. However, since CO2 itself has a small molecular weight and a high system pressure, a more severe demand is placed on leakage of the refrigerant in long-term use. Therefore, in the CO2 refrigerant system, detection and determination of CO2 refrigerant leakage are problems that need to be solved at present.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a method for detecting CO2 leakage, which is used to solve the problem of detecting and determining CO2 refrigerant leakage.
In order to achieve the above and other related objects, the present invention provides a method for detecting CO2 leakage, including:
responding to a triggering leakage detection instruction, performing leakage detection on the refrigerant, and determining whether the refrigerant leaks or not;
calculating the leakage amount of CO2 in the refrigerant if the refrigerant has leakage;
and if the refrigerant has no leakage, stopping the leakage detection of the refrigerant.
Optionally, in response to triggering a leakage detection instruction and performing leakage detection on the refrigerant, the process of determining whether the refrigerant has leaked includes:
acquiring a maximum detection temperature value and a minimum detection temperature value of the refrigerant in a first time period, and acquiring a maximum detection pressure value and a minimum detection pressure value of the refrigerant in the first time period;
calculating the difference value between the maximum detection temperature value and the minimum detection temperature value to obtain the temperature difference in a first time period; and the number of the first and second groups,
calculating the difference value between the maximum detection pressure value and the minimum detection pressure value to obtain the pressure difference in a first time period;
judging whether the temperature difference in the first time period is smaller than a preset temperature value or not, and judging whether the pressure difference in the first time period is smaller than a preset pressure value or not;
if the temperature difference is smaller than a preset temperature value and the pressure difference is smaller than a preset pressure value, calculating the density of the refrigerant, and determining whether the refrigerant leaks or not based on the density of the refrigerant;
and if the temperature difference is greater than or equal to a preset temperature value and/or the pressure difference is greater than or equal to a preset pressure value, detecting leakage of the refrigerant again.
Optionally, the process of calculating the density of the refrigerant and determining whether the refrigerant leaks based on the density of the refrigerant includes:
acquiring real-time temperature values and real-time pressure values of the refrigerating system at any time in a stable state after any refrigerant is completely evaporated;
calculating the density at this moment according to the real-time temperature value and the real-time pressure value,
calculating the difference between the density at this moment and the density at the initial charge of the refrigeration system, and determining whether the difference is less than zero;
determining that the refrigerant is leaked if the difference is less than zero;
if the difference is equal to zero, it is determined that the leakage of the refrigerant has not occurred. .
Optionally, after calculating the amount of CO2 leakage in the refrigerant, the method further includes:
judging the leakage grade of the refrigerant according to the leakage amount of the CO 2;
if the refrigerant is in the first leakage level, stopping the leakage detection of the refrigerant;
if the refrigerant leakage level is the second leakage level, sending out a refrigerant leakage prompt message;
if the leakage level is at the third leakage level, alarming for insufficient refrigerant is carried out;
if the leakage level is the fourth leakage level, controlling the air conditioner to stop running;
the maximum leakage amount corresponding to the first leakage grade is less than or equal to the minimum leakage amount of the second leakage grade;
the maximum leakage amount corresponding to the second leakage grade is less than or equal to the minimum leakage amount of a third leakage grade;
the maximum leakage amount corresponding to the third leakage grade is less than or equal to the minimum leakage amount of the fourth leakage grade.
Optionally, in response to triggering a leakage detection instruction and performing leakage detection on the refrigerant, the process of determining whether the refrigerant has leaked includes:
acquiring real-time temperature values and real-time pressure values at any time in a stable state of a refrigeration system after any refrigerant is completely evaporated;
calculating the density at this moment according to the real-time temperature value and the real-time pressure value,
calculating the difference between the density at this moment and the density at the initial charge of the refrigeration system, and determining whether the difference is less than zero;
determining that the refrigerant is leaked if the difference is less than zero;
if the difference is equal to zero, it is determined that the leakage of the refrigerant has not occurred.
Optionally, the generating of the trigger leak detection instruction includes:
judging whether the air conditioner is closed or not; if the air conditioner is closed, the next step is carried out; if the air conditioner is not closed, the trigger leakage detection instruction is not generated;
judging whether the external temperature value of the air conditioner is greater than a preset temperature reference value or not; if the external temperature value of the air conditioner is greater than the preset temperature reference value, entering the next step; if the external temperature value of the air conditioner is smaller than or equal to the preset temperature reference value, the trigger leakage detection instruction is not generated;
judging whether the shutdown time of the air conditioner is greater than a preset time reference value or not; if the shutdown time of the air conditioner is greater than the preset time reference value, entering the next step; if the shutdown time of the air conditioner is less than or equal to a preset time reference value, the trigger leakage detection instruction is not generated;
judging whether the temperature difference of the refrigerant is smaller than a preset temperature reference difference or not; if the refrigerant temperature difference is smaller than a preset temperature reference difference, generating the trigger leakage detection instruction; and if the refrigerant temperature difference is greater than or equal to a preset temperature reference difference, the trigger leakage detection instruction is not generated.
Optionally, the generating of the trigger leak detection instruction includes:
judging whether the air conditioner is closed or not; if the air conditioner is closed, the next step is carried out; if the air conditioner is not closed, the trigger leakage detection instruction is not generated;
judging whether the external temperature value of the air conditioner is greater than a preset temperature reference value or not; if the external temperature value of the air conditioner is greater than the preset temperature reference value, entering the next step; if the external temperature value of the air conditioner is smaller than or equal to the preset temperature reference value, the trigger leakage detection instruction is not generated;
judging whether the shutdown time of the air conditioner is greater than a preset time reference value or not; if the shutdown time of the air conditioner is larger than a preset time reference value, generating the trigger leakage detection instruction; and if the shutdown time of the air conditioner is less than or equal to the preset time reference value, not generating the trigger leakage detection instruction.
As described above, the present invention provides a method for detecting CO2 leakage amount, which has the following beneficial effects: firstly, responding to a triggering leakage detection instruction, detecting leakage of the refrigerant, and determining whether the refrigerant leaks or not; if the refrigerant leaks, calculating the leakage amount of CO2 in the refrigerant; if the refrigerant has not leaked, the refrigerant leakage detection is stopped. Therefore, the invention can test the leakage amount of the refrigerant of the CO2 refrigeration and heat pump device under the static working condition by using the necessary sensor in the original CO2 system under the condition of not increasing any detection equipment, thereby achieving the effects of leakage prompting, leakage early warning and shutdown protection. In addition, the invention well solves the problems of detection and judgment of the leakage amount of the CO2 refrigeration and heat pump device system, and can accurately judge the refrigerant leakage amount in both qualitative and quantitative aspects. Meanwhile, the detection and judgment can be in a system static state, starting equipment is not needed, and more auxiliary detection equipment is not needed.
Drawings
Fig. 1 is a schematic flow chart of a CO2 leakage amount detection method according to an embodiment;
FIG. 2 is a flowchart illustrating the generation of a trigger leak detection instruction according to an embodiment;
FIG. 3 is a flowchart illustrating the generation of a trigger leak detection instruction according to another embodiment;
FIG. 4 is a schematic diagram illustrating an exemplary embodiment of a graph of the air conditioner down time versus the air conditioner external temperature;
fig. 5 is a schematic diagram of different refrigerant leakage density curves at different temperatures of the same air conditioning system according to an embodiment.
Detailed Description
The following embodiments of the present invention are provided by way of specific examples, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
Referring to fig. 1, the present invention provides a method for detecting CO2 leakage, including the following steps:
and responding to a triggering leakage detection instruction, performing leakage detection on the refrigerant, and determining whether the refrigerant leaks.
If the refrigerant leaks, calculating the leakage amount of CO2 in the refrigerant;
and if the refrigerant has no leakage, stopping the leakage detection of the refrigerant.
As an example, as shown in fig. 2, the generation process of the trigger leak detection instruction includes: judging whether the air conditioner is closed or not; if the air conditioner is closed, the next step is carried out; if the air conditioner is not closed, the trigger leakage detection instruction is not generated; judging whether the external temperature value of the air conditioner is greater than a preset temperature reference value or not; if the external temperature value of the air conditioner is greater than the preset temperature reference value, entering the next step; if the external temperature value of the air conditioner is smaller than or equal to the preset temperature reference value, the trigger leakage detection instruction is not generated; judging whether the shutdown time of the air conditioner is greater than a preset time reference value or not; if the shutdown time of the air conditioner is greater than the preset time reference value, entering the next step; if the shutdown time of the air conditioner is less than or equal to a preset time reference value, the triggering leakage detection instruction is not generated; judging whether the temperature difference of the refrigerant is smaller than a preset temperature reference difference or not; if the refrigerant temperature difference is smaller than a preset temperature reference difference, generating the trigger leakage detection instruction; and if the refrigerant temperature difference is greater than or equal to the preset temperature reference difference, not generating the trigger leakage detection instruction. In fig. 2, tbase: indicating the minimum temperature required to enter leak testing (different systems, different fill volumes for different minimum temperatures). And (f) reference: different external temperatures are indicated, corresponding to different downtime. A T benchmark: the maximum value allowed in the error range of the refrigerant temperature difference (maximum refrigerant temperature-minimum refrigerant temperature) collected by the air conditioning system sensor is shown. Wherein, the curve diagram of the air conditioner shutdown time and the air conditioner external temperature is shown in fig. 4, and the curve diagram of different refrigerant leakage quantity density under different temperatures of the same air conditioning system is shown in fig. 5.
As another example, as shown in fig. 3, the generation process of the trigger leak detection instruction includes: judging whether the air conditioner is closed or not; if the air conditioner is closed, the next step is carried out; if the air conditioner is not closed, the trigger leakage detection instruction is not generated; judging whether the external temperature value of the air conditioner is greater than a preset temperature reference value or not; if the external temperature value of the air conditioner is greater than the preset temperature reference value, entering the next step; if the external temperature value of the air conditioner is less than or equal to the preset temperature reference value, the trigger leakage detection instruction is not generated; judging whether the shutdown time of the air conditioner is greater than a preset time reference value or not; if the shutdown time of the air conditioner is greater than a preset time reference value, generating the trigger leakage detection instruction; and if the shutdown time of the air conditioner is less than or equal to the preset time reference value, not generating the trigger leakage detection instruction. In fig. 2, tbase: indicating the minimum temperature required to enter leak testing (different systems, different fill volumes for different minimum temperatures). And (f) reference t: different external temperatures are indicated, corresponding to different downtime. A T benchmark: the maximum value allowed in the error range of the refrigerant temperature difference (maximum refrigerant temperature-minimum refrigerant temperature) collected by the air conditioning system sensor is shown. Wherein, the curve diagram of the air conditioner shutdown time and the air conditioner external temperature is shown in fig. 4, and the curve diagram of different refrigerant leakage quantity density under different temperatures of the same air conditioning system is shown in fig. 5.
In an exemplary embodiment, in response to triggering a leak detection command and performing a leak detection on refrigerant, determining whether the refrigerant has leaked comprises:
acquiring a maximum detection temperature value and a minimum detection temperature value of the refrigerant in a first time period, and acquiring a maximum detection pressure value and a minimum detection pressure value of the refrigerant in the first time period;
calculating the difference value of the maximum detection temperature value and the minimum detection temperature value to obtain the temperature difference in a first time period; calculating a difference value between the maximum detection pressure value and the minimum detection pressure value to obtain a pressure difference in a first time period;
judging whether the temperature difference in the first time period is smaller than a preset temperature value or not, and judging whether the pressure difference in the first time period is smaller than a preset pressure value or not;
if the temperature difference is smaller than a preset temperature value and the pressure difference is smaller than a preset pressure value, calculating the density of the refrigerant, and determining whether the refrigerant leaks or not based on the density of the refrigerant; and if the temperature difference is greater than or equal to a preset temperature value and/or the pressure difference is greater than or equal to a preset pressure value, detecting leakage of the refrigerant again.
According to the above, in an exemplary embodiment, the process of calculating the density of the refrigerant and determining whether the refrigerant has leaked based on the density of the refrigerant includes:
acquiring real-time temperature values and real-time pressure values at any time in a stable state of a refrigeration system after any refrigerant is completely evaporated;
calculating the density at this moment according to the real-time temperature value and the real-time pressure value,
calculating the difference between the density at the moment and the density at the initial filling amount of the refrigeration system, and judging whether the difference is less than zero;
determining that the refrigerant is leaked if the difference is less than zero;
if the difference is equal to zero, it is determined that the refrigerant is not leaked.
According to the above, in an exemplary embodiment, after calculating the amount of CO2 leakage in the refrigerant, the method further includes: judging the leakage grade of the refrigerant according to the leakage amount of the CO 2; if the refrigerant is in the first leakage grade, stopping leakage detection of the refrigerant; if the refrigerant leakage level is the second leakage level, sending out a refrigerant leakage prompt message; if the leakage level is in the third leakage level, alarming for insufficient refrigerant; if the leakage level is the fourth leakage level, controlling the air conditioner to stop running; the maximum leakage amount corresponding to the first leakage grade is less than or equal to the minimum leakage amount of the second leakage grade; the maximum leakage amount corresponding to the second leakage grade is less than or equal to the minimum leakage amount of a third leakage grade; and the maximum leakage amount corresponding to the third leakage grade is less than or equal to the minimum leakage amount of the fourth leakage grade. In this embodiment, the CO2 leakage amount may be expressed by density or mass. If the leakage amount of the CO2 is represented by quality, the corresponding leakage grade is a quality leakage grade; if the CO2 leakage amount is expressed by density, the corresponding leakage grade is a density leakage grade.
In another exemplary embodiment of the present invention, in response to a triggering of a leak detection instruction and a refrigerant leak detection, the process of determining whether the refrigerant leak occurs includes: acquiring real-time temperature values and real-time pressure values of the refrigerating system at any time in a stable state after any refrigerant is completely evaporated; calculating the density at the moment according to the real-time temperature value and the real-time pressure value, calculating a difference value between the density at the moment and the density at the initial filling amount of the refrigeration system, and judging whether the difference value is less than zero; determining that the refrigerant is leaked if the difference is less than zero; if the difference is equal to zero, it is determined that the leakage of the refrigerant has not occurred.
In another exemplary embodiment of the present invention, the embodiment provides a CO2 leakage amount detection method, including the steps of: triggering leakage detection, detecting whether leakage exists, calculating leakage amount, judging leakage grade, and automatically feeding back and protecting. Specifically, the method comprises the following steps:
triggering a leak test comprises: stopping, judging the ambient temperature, judging the stopping time and judging whether the refrigerant is completely evaporated.
Determining the detection leak includes: triggering leakage detection, reading collected refrigerant temperature and pressure (P, T), judging whether an air-conditioning system is stable, calculating the refrigerant density rho = (P, T) of the air-conditioning system, and indicating that no leakage exists, wherein the refrigerant density rho of the air-conditioning system is equal to the initial filling density rho 1 at the same external temperature; otherwise, a leak is indicated and the amount of leak is calculated.
The automatic feedback and protection includes: the leakage is prompted, the alarm is given when the refrigerant is insufficient, the shutdown protection is carried out, the refrigerant is insufficient, and the system cannot be started normally.
In summary, the present invention provides a method for detecting CO2 leakage, which first responds to a leakage detection triggering instruction, and performs leakage detection on a refrigerant to determine whether the refrigerant leaks; if the refrigerant leaks, calculating the leakage amount of CO2 in the refrigerant; if the refrigerant has not leaked, the refrigerant leakage detection is stopped. Therefore, the invention can test the leakage amount of the refrigerant of the CO2 refrigeration and heat pump device under the static working condition by using the necessary sensor in the original CO2 system under the condition of not increasing any detection equipment, thereby achieving the effects of leakage prompting, leakage early warning and shutdown protection. In addition, the invention well solves the problems of detection and judgment of the leakage amount of the CO2 refrigeration and heat pump device system, and can accurately judge the refrigerant leakage amount in both qualitative and quantitative aspects. Meanwhile, the detection and judgment can be in a system static state, starting equipment is not needed, and more auxiliary detection equipment is not needed.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (7)
1. A CO2 leakage amount detection method is characterized by comprising the following steps:
responding to a triggering leakage detection instruction, performing leakage detection on the refrigerant, and determining whether the refrigerant leaks;
calculating the leakage amount of CO2 in the refrigerant if the refrigerant has leakage;
and if the refrigerant has no leakage, stopping the leakage detection of the refrigerant.
2. The CO2 leakage detection method according to claim 1, wherein in response to a leak detection command being triggered and a refrigerant being tested for leakage, determining whether the refrigerant is leaking comprises:
acquiring a maximum detection temperature value and a minimum detection temperature value of the refrigerant in a first time period, and acquiring a maximum detection pressure value and a minimum detection pressure value of the refrigerant in the first time period;
calculating the difference value of the maximum detection temperature value and the minimum detection temperature value to obtain the temperature difference in a first time period; and the number of the first and second groups,
calculating the difference value between the maximum detection pressure value and the minimum detection pressure value to obtain the pressure difference in a first time period;
judging whether the temperature difference in the first time period is smaller than a preset temperature value or not, and judging whether the pressure difference in the first time period is smaller than a preset pressure value or not;
if the temperature difference is smaller than a preset temperature value and the pressure difference is smaller than a preset pressure value, calculating the density of the refrigerant, and determining whether the refrigerant leaks or not based on the density of the refrigerant;
and if the temperature difference is greater than or equal to a preset temperature value and/or the pressure difference is greater than or equal to a preset pressure value, detecting leakage of the refrigerant again.
3. The CO2 leak amount detection method according to claim 2, wherein the process of calculating the density of the refrigerant and determining whether the refrigerant leaks based on the density of the refrigerant includes:
acquiring real-time temperature values and real-time pressure values of the refrigerating system at any time in a stable state after any refrigerant is completely evaporated;
calculating the density at the moment according to the real-time temperature value and the real-time pressure value,
calculating the difference between the density at the moment and the density at the initial filling amount of the refrigeration system, and judging whether the difference is less than zero;
determining that the refrigerant is leaked if the difference is less than zero;
if the difference is equal to zero, it is determined that the leakage of the refrigerant has not occurred.
4. The CO2 leakage amount detection method according to claim 1 or 3, wherein after the amount of CO2 leakage in the refrigerant is calculated, the method further comprises:
judging the leakage grade of the refrigerant according to the leakage amount of the CO 2;
if the refrigerant is in the first leakage level, stopping the leakage detection of the refrigerant;
if the refrigerant leakage level is the second leakage level, sending out a refrigerant leakage prompt message;
if the leakage level is in the third leakage level, alarming for insufficient refrigerant;
if the leakage level is the fourth leakage level, controlling the air conditioner to stop running;
the maximum leakage amount corresponding to the first leakage grade is less than or equal to the minimum leakage amount of the second leakage grade;
the maximum leakage amount corresponding to the second leakage grade is less than or equal to the minimum leakage amount of a third leakage grade;
the maximum leakage amount corresponding to the third leakage grade is less than or equal to the minimum leakage amount of the fourth leakage grade.
5. The CO2 leak detection method of claim 1, wherein in response to triggering a leak detection command and performing a leak detection on the refrigerant, determining whether the refrigerant has leaked comprises:
acquiring real-time temperature values and real-time pressure values of the refrigerating system at any time in a stable state after any refrigerant is completely evaporated;
calculating the density at this moment according to the real-time temperature value and the real-time pressure value,
calculating the difference between the density at this moment and the density at the initial charge of the refrigeration system, and determining whether the difference is less than zero;
determining that the refrigerant is leaked if the difference is less than zero;
if the difference is equal to zero, it is determined that the leakage of the refrigerant has not occurred.
6. The CO2 leakage detection method of claim 1, wherein the generating of the trigger leakage detection command comprises:
judging whether the air conditioner is closed or not; if the air conditioner is closed, the next step is carried out; if the air conditioner is not closed, the trigger leakage detection instruction is not generated;
judging whether the external temperature value of the air conditioner is greater than a preset temperature reference value or not; if the external temperature value of the air conditioner is greater than the preset temperature reference value, entering the next step; if the external temperature value of the air conditioner is smaller than or equal to the preset temperature reference value, the trigger leakage detection instruction is not generated;
judging whether the shutdown time of the air conditioner is greater than a preset time reference value or not; if the shutdown time of the air conditioner is greater than the preset time reference value, entering the next step; if the shutdown time of the air conditioner is less than or equal to a preset time reference value, the trigger leakage detection instruction is not generated;
judging whether the temperature difference of the refrigerant is smaller than a preset temperature reference difference or not; if the refrigerant temperature difference is smaller than a preset temperature reference difference, generating the trigger leakage detection instruction; and if the refrigerant temperature difference is greater than or equal to the preset temperature reference difference, not generating the trigger leakage detection instruction.
7. The CO2 leakage detection method of claim 1, wherein the generating of the trigger leakage detection command comprises:
judging whether the air conditioner is closed or not; if the air conditioner is closed, the next step is carried out; if the air conditioner is not closed, the trigger leakage detection instruction is not generated;
judging whether the external temperature value of the air conditioner is greater than a preset temperature reference value or not; if the external temperature value of the air conditioner is greater than the preset temperature reference value, entering the next step; if the external temperature value of the air conditioner is smaller than or equal to the preset temperature reference value, the trigger leakage detection instruction is not generated;
judging whether the shutdown time of the air conditioner is greater than a preset time reference value or not; if the shutdown time of the air conditioner is greater than a preset time reference value, generating the trigger leakage detection instruction; and if the shutdown time of the air conditioner is less than or equal to the preset time reference value, not generating the trigger leakage detection instruction.
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| PCT/CN2023/139060 WO2024104496A1 (en) | 2022-11-18 | 2023-12-15 | Co2 leakage rate measurement method |
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| WO2024104496A1 (en) * | 2022-11-18 | 2024-05-23 | 应雪汽车科技(常熟)有限公司 | Co2 leakage rate measurement method |
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| WO2024104496A1 (en) | 2024-05-23 |
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