Gas sensor cleaning device and cleaning method

Abstract

The present invention provides a gas sensor cleaning device and cleaning method, the device includes: a gas channel, a gas flow rate detection device, a first air intake pump and a controller, wherein the first end of the gas channel is connected to the air intake end of the gas sensor, and the second end is connected to the cleaning gas of the gas sensor through the first air intake pump; the gas flow rate detection device is arranged in the gas channel; the first input end of the controller is connected to the gas flow rate detection device, the second input end is connected to the output end of the gas sensor, and the output end is connected to the control end of the first air intake pump, which is used to control the first air intake pump according to the gas flow rate detected by the gas flow rate detection device and the gas detection result of the gas sensor to complete the cleaning of the gas sensor. By real-time detection of the flow rate of the cleaning gas flowing into the gas sensor, the air extraction volume of the air intake pump is flexibly adjusted, and the working time of the air intake pump is flexibly controlled to achieve the optimal cleaning effect and protect the life of the gas sensor.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and in particular to a gas sensor cleaning device and a cleaning method. Background Art

[0002] A gas sensor is a device that uses an identification element to sense gas detection signals and converts them into other usable signals through a conversion element according to a certain rule. Its sensor array is composed of relatively sensitive gas-sensitive materials. In order to ensure the accuracy of the gas sensor's detection results, it needs to be cleaned after each detection to prevent the previous gas detection sample from affecting the detection results of the next gas detection sample. In the prior art, it is usually cleaned by passing a gas such as air that has no effect on the detection results into the gas sensor for a certain period of time. However, since the flow rate of the cleaning gas may vary, if the cleaning time is too short, it may lead to incomplete cleaning and affect the detection results. If the cleaning time is too long, it may affect the service life of the sensor and also affect the final detection results. Therefore, how to solve the problem of incomplete or excessive cleaning of the gas sensor during use is of great significance to ensuring the accuracy of the gas sensor's detection results. Summary of the invention

[0003] In view of this, an embodiment of the present invention provides a gas sensor cleaning device and a cleaning method to overcome the problem in the prior art that the gas sensor is not cleaned thoroughly or is over-cleaned during use, thereby affecting the accuracy of the detection results of the gas sensor.

[0004] According to a first aspect, an embodiment of the present invention provides a gas sensor cleaning device, comprising: a gas channel, a gas flow rate detection device, a first air intake pump and a controller, wherein:

[0005] The first end of the first gas channel is connected to the gas inlet end of the gas sensor through the gas flow rate detection device, and the second end is connected to the cleaning gas of the gas sensor through the first air inlet pump;

[0006] The gas flow rate detection device is arranged in the gas channel;

[0007] The first input end of the controller is connected to the gas flow rate detection device, the second input end is connected to the output end of the gas sensor, and the output end is connected to the control end of the first air intake pump, and is used to control the first air intake pump according to the gas flow rate detected by the gas flow rate detection device and the gas detection result of the gas sensor to complete the cleaning of the gas sensor.

[0008] Optionally, a first gas valve is further provided at the second end of the gas channel, and the first air intake pump is connected to the cleaning gas through the first gas valve.

[0009] Optionally, the gas sensor cleaning device further comprises: a second air intake pump,

[0010] The third end of the gas channel is connected to the gas to be detected by the gas sensor through the second air inlet pump;

[0011] The third input end of the controller is connected to the control end of the second air intake pump, and the controller is also used to control the suction volume of the second air intake pump according to the gas flow rate detected by the gas flow rate detection device, so that the gas flow rate conforms to the preset gas flow rate range, thereby completing the detection of the gas to be detected.

[0012] Optionally, a second gas valve is further provided at the third end of the gas channel, and the second air intake pump is connected to the gas to be detected through the second gas valve.

[0013] According to a second aspect, an embodiment of the present invention further provides a gas sensor cleaning method, which is applied to a controller of a gas sensor cleaning device as described in the first aspect and any one of its embodiments, the method comprising:

[0014] When receiving a cleaning instruction of the gas sensor, controlling the first air inlet pump to open and supply cleaning gas to the gas sensor;

[0015] The first air intake pump is controlled according to the gas flow rate detected by the gas flow rate detection device and the gas detection result of the gas sensor to complete the cleaning of the gas sensor.

[0016] Optionally, controlling the first air intake pump according to the gas flow rate detected by the gas flow rate detection device and the gas detection result of the gas sensor includes:

[0017] adjusting the air extraction volume of the first air intake pump based on the relationship between the gas flow rate and a preset gas flow rate range;

[0018] After the first air intake pump runs for a first time, obtaining a first gas detection result of the gas sensor;

[0019] Based on the relationship between the first gas detection result and a preset no-load detection result of the gas sensor, the operation time of the first air intake pump is adjusted.

[0020] Optionally, adjusting the air extraction amount of the first air intake pump based on the relationship between the gas flow rate and a preset gas flow rate range includes:

[0021] Determining whether the gas flow rate is within the preset gas flow rate range;

[0022] When the gas flow rate is within the preset gas flow rate range, maintaining the current air pumping volume of the first air intake pump;

[0023] When the gas flow rate is less than the minimum gas flow rate value of the preset gas flow rate range, increasing the current gas extraction volume of the first air intake pump, and returning to the step of determining whether the gas flow rate is within the preset gas flow rate range;

[0024] When the gas flow rate is greater than the maximum gas flow rate value of the preset gas flow rate range, the current air suction volume of the first air intake pump is reduced, and the process returns to the step of determining whether the gas flow rate is within the preset gas flow rate range.

[0025] Optionally, adjusting the running time of the first air intake pump based on the relationship between the first gas detection result and a preset no-load detection result of the gas sensor includes:

[0026] Calculating a current deviation value between the first gas detection result and the preset no-load detection result;

[0027] Based on the relationship between the preset deviation value and the running time, calculating the first running time corresponding to the current deviation value;

[0028] The first air intake pump is controlled to continue running at the current air extraction volume for a first running time and then stop.

[0029] Optionally, after controlling the first air intake pump to continue running at the current air extraction volume for a first running time and then stopping, the method further includes:

[0030] Acquire a second gas detection result of the gas sensor;

[0031] Determining whether the second gas detection result is consistent with the preset no-load detection result;

[0032] When the second gas detection result is consistent with the preset no-load detection result, determining that the gas sensor has completed cleaning;

[0033] When the second gas detection result is inconsistent with the preset no-load detection result, a gas sensor failure warning is issued.

[0034] Optionally, after the cleaning of the gas sensor is completed, the method further comprises:

[0035] Control the second air inlet pump to open and introduce the gas to be detected into the gas sensor;

[0036] The air extraction volume of the second air intake pump is controlled according to the gas flow rate detected by the gas flow rate detection device so that the gas flow rate meets the preset gas flow rate range, thereby completing the detection of the gas to be detected.

[0037] The technical solution of the present invention has the following advantages:

[0038] 1. The gas sensor cleaning device provided by the embodiment of the present invention comprises: a gas channel, a gas flow rate detection device, a first air intake pump and a controller, wherein the first end of the gas channel is connected to the air intake end of the gas sensor, and the second end is connected to the cleaning gas of the gas sensor through the first air intake pump; the gas flow rate detection device is arranged in the gas channel; the first input end of the controller is connected to the gas flow rate detection device, the second input end is connected to the output end of the gas sensor, and the output end is connected to the control end of the first air intake pump, and is used to control the first air intake pump according to the gas flow rate detected by the gas flow rate detection device and the gas detection result of the gas sensor to complete the cleaning of the gas sensor. Therefore, by arranging the air intake pump and the gas flow rate detection device in the gas channel at the air intake end of the gas sensor, the flow rate of the cleaning gas flowing into the gas sensor can be detected in real time, the air extraction volume of the air intake pump can be flexibly adjusted, and whether it is clean can be confirmed in combination with the detection result of the gas sensor, and the working time of the air intake pump can be flexibly controlled to achieve the optimal cleaning effect and protect the service life of the gas sensor.

[0039] 2. The gas sensor cleaning method provided in an embodiment of the present invention is applied to the controller in the gas sensor cleaning device provided in another embodiment of the present invention, by controlling the first air intake pump to open and introduce cleaning gas to the gas sensor when receiving the cleaning instruction of the gas sensor; the first air intake pump is controlled according to the gas flow rate detected by the gas flow rate detection device and the gas detection result of the gas sensor to complete the cleaning of the gas sensor. Therefore, by arranging the air intake pump and the gas flow rate detection device in the gas channel at the air intake end of the gas sensor, the flow rate of the cleaning gas flowing into the gas sensor can be detected in real time, the air extraction volume of the air intake pump can be flexibly adjusted, and whether it is clean can be confirmed in combination with the detection result of the gas sensor, and the working time of the air intake pump can be flexibly controlled to achieve the optimal cleaning effect and protect the service life of the gas sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0041] Figure 1 A schematic diagram of the structure of a gas sensor cleaning device according to an embodiment of the present invention;

[0042] Figure 2A flow chart of a gas sensor cleaning method according to an embodiment of the present invention;

[0043] Figure 3 It is a schematic diagram of the specific working process of the gas sensor cleaning device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0045] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0046] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two components, it can be a wireless connection, or it can be a wired connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] The technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0048] A gas sensor is a device that uses an identification element to sense gas detection signals and converts them into other usable signals through a conversion element according to a certain rule. Its sensor array is composed of relatively sensitive gas-sensitive materials. In order to ensure the accuracy of the gas sensor's detection results, it needs to be cleaned after each detection to prevent the previous gas detection sample from affecting the detection results of the next gas detection sample. In the prior art, it is usually cleaned by passing a gas such as air that has no effect on the detection results into the gas sensor for a certain period of time. However, since the flow rate of the cleaning gas may vary, if the cleaning time is too short, it may lead to incomplete cleaning and affect the detection results. If the cleaning time is too long, it may affect the service life of the sensor and also affect the final detection results. Therefore, how to solve the problem of incomplete or excessive cleaning of the gas sensor during use is of great significance to ensuring the accuracy of the gas sensor's detection results.

[0049] Based on the above problems, an embodiment of the present invention provides a gas sensor cleaning device, such as Figure 1 As shown, the gas sensor cleaning device includes: a gas channel 101, a gas flow rate detection device 102, a first air intake pump 103 and a controller ( Figure 1 104), wherein a first end of the gas channel 101 is connected to an air inlet end of the gas sensor 104, and a second end is connected to a cleaning gas of the gas sensor through a first air inlet pump 103; a gas flow rate detection device 102 is arranged in the gas channel 101; a first input end of the controller is connected to the gas flow rate detection device 102, a second input end is connected to an output end of the gas sensor 104, and an output end is connected to a control end of the first air inlet pump 103, for controlling the first air inlet pump 103 according to the gas flow rate detected by the gas flow rate detection device 102 and the gas detection result of the gas sensor 104, so as to complete the cleaning of the gas sensor 104.

[0050] The gas flow rate detection device 102 may be a gas flow rate detector or other device or sensor capable of detecting gas flow rate, but the present invention is not limited thereto. The specific working principle and working process of the controller are described in detail in the following method embodiment, which will not be described in detail here.

[0051] The gas sensor cleaning equipment detects the gas flow rate by using a gas flow rate detection device. If the gas flow rate is too fast or too slow, the air intake pump is controlled to adjust the cleaning time and gas flow rate to achieve the best cleaning effect, so that the test sensitivity of the gas sensor reaches the optimal effect. The cleaning status can also be fed back through the real-time data detection of the gas sensor to confirm whether it is cleaned thoroughly.

[0052] Specifically, in one embodiment, if Figure 1As shown, a first gas valve 105 is further provided at the second end of the gas channel 101, and the first air intake pump 103 is connected to the cleaning gas through the first gas valve 105. The first gas valve 105 is used to achieve access to the cleaning gas. When the first gas valve 105 is opened, external cleaning gas such as air is pumped to the gas sensor 104 through the first air intake pump 103 to achieve cleaning of the gas sensor 104.

[0053] Specifically, in one embodiment, if Figure 1 As shown, the above-mentioned body sensor cleaning device also includes: a second air intake pump 106, the third end of the gas channel 101 is connected to the gas to be detected of the gas sensor 104 through the second air intake pump 106; the third input end of the controller is connected to the control end of the second air intake pump 106, and the controller is also used to control the suction volume of the second air intake pump 106 according to the gas flow rate detected by the gas flow rate detection device 102, so that the gas flow rate meets the preset gas flow rate range, and completes the detection of the gas to be detected. The specific working principle and working process of the controller are detailed in the relevant description of the method embodiment below, which will not be repeated here.

[0054] Specifically, the third end of the gas channel 101 is also provided with a second gas valve 107, and the second air intake pump 106 is connected to the gas to be detected through the second gas valve 107. The second gas valve 107 is used to achieve the access of the gas to be detected. When the second gas valve 107 is opened, the external gas to be detected, such as: the gas containing formaldehyde, is pumped to the gas sensor 104 through the second air intake pump 106, so that the formaldehyde concentration is detected by the gas sensor 104. In actual applications, the above-mentioned first gas valve 105 and the second gas valve 107 can be opened manually, or can be controlled to open or close by a controller, so as to realize a fully automated cleaning function and a gas detection function of the gas sensor 104, and further enhance the user experience.

[0055] The gas sensor cleaning equipment provided in the embodiment of the present invention can detect the flow rate of the cleaning gas flowing into the gas sensor in real time by arranging an air intake pump and a gas flow rate detection device in the gas channel at the air intake end of the gas sensor, flexibly adjust the suction volume of the air intake pump, confirm whether it is clean in combination with the detection results of the gas sensor, flexibly control the working time of the air intake pump, achieve the optimal cleaning effect, and protect the service life of the gas sensor.

[0056] The present invention also provides a gas sensor cleaning method, which is applied to Figure 1 The controller shown, such as Figure 2 As shown, the gas sensor cleaning method specifically includes the following steps:

[0057] Step S101: upon receiving a cleaning instruction from the gas sensor, controlling the first air intake pump to open and supply cleaning gas to the gas sensor.

[0058] Step S102: controlling the first air intake pump according to the gas flow rate detected by the gas flow rate detection device and the gas detection result of the gas sensor to complete the cleaning of the gas sensor.

[0059] Specifically, in one embodiment, the above step S102 specifically includes the following steps:

[0060] Step S201: adjusting the air extraction volume of the first air intake pump based on the relationship between the gas flow rate and a preset gas flow rate range.

[0061] Among them, the preset gas flow rate range is the gas flow rate range with the highest sensitivity of the gas sensor. This range can be measured through experiments and is specifically related to the design parameters and type of the gas sensor. Exemplarily, the preset gas flow rate range is 2-2.5L / min.

[0062] Specifically, by judging whether the gas flow rate is within the preset gas flow rate range; when the gas flow rate is within the preset gas flow rate range, maintaining the current air pumping volume of the first air intake pump; when the gas flow rate is less than the minimum gas flow rate value of the preset gas flow rate range, increasing the current air pumping volume of the first air intake pump, and returning to the step of judging whether the gas flow rate is within the preset gas flow rate range; when the gas flow rate is greater than the maximum gas flow rate value of the preset gas flow rate range, reducing the current air pumping volume of the first air intake pump, and returning to the step of judging whether the gas flow rate is within the preset gas flow rate range. Exemplarily, the air intake volume of the air intake pump can be controlled by adjusting the pressure of the air intake pump. The greater the adjustment pressure, the greater the air intake volume, thereby accelerating the flow rate of the gas in the gas channel. Conversely, the smaller the adjustment pressure, the smaller the air intake volume, and reducing the flow rate of the gas in the gas channel. Therefore, by controlling the flow rate of the cleaning gas introduced into the gas sensor, the gas sensor test sensitivity can be guaranteed to achieve the optimal effect, so that it can accurately detect whether it is cleaned, avoid the problem of insufficient or excessive cleaning, and improve the user experience.

[0063] Step S202: After the first air intake pump runs for a first time, a first gas detection result of the gas sensor is obtained.

[0064] The first time may be a preset standard cleaning time of the gas sensor, or a minimum cleaning time required for the gas sensor to be cleaned. The specific time selection may be flexibly set according to actual needs, and the present invention is not limited thereto. By controlling the air intake pump to run for a period of time to clean the gas sensor, and then using the gas sensor to detect gas, it is possible to avoid the gas sensor from performing real-time gas detection during the cleaning process and affecting the service life of the gas sensor, thereby further protecting the gas sensor and extending its service life.

[0065] Step S203: Based on the relationship between the first gas detection result and the preset no-load detection result of the gas sensor, adjusting the operation time of the first air intake pump.

[0066] Specifically, by calculating the current deviation value between the first gas detection result and the preset no-load detection result; based on the relationship between the preset deviation value and the operating time, calculating the first operating time corresponding to the current deviation value; controlling the first air intake pump to continue running at the current suction volume for the first operating time and then shut down.

[0067] Among them, the preset no-load detection result is the data obtained by performing a no-load test on the gas sensor after calibration and aging when no gas to be detected is introduced, such as: when the gas sensor is used in cooking equipment such as a steam oven or an oven, it can be obtained by performing a no-load test on the cooking utensil. The preset no-load detection result can be used to check whether the gas sensor is cleaned. If the gas detection result fed back by the gas sensor is consistent with the preset no-load detection result, it means that it has been cleaned. If there is a deviation, it means that it has not been cleaned. Specifically, the relationship between the above-mentioned preset deviation value and the running time can be determined according to experiments. For example, when the deviation value is less than 0.1, the first running time is 1 / α, that is, the cleaning time is extended by 1 / α, and α is the above-mentioned first time; when the deviation value is between 0.1-0.3, the cleaning time is extended by 2 / α; when the deviation value is between 0.3-0.5, the cleaning time is extended by 3 / α. During the extended cleaning time, the current gas flow rate is maintained unchanged, that is, the working state of the current first air intake pump is maintained. In addition, in practical applications, the functional relationship between the deviation value and the operating time can be determined experimentally, and the operating time corresponding to the current deviation value can be calculated based on the functional relationship, and then the cleaning time can be delayed to achieve a good cleaning effect. The present invention is not limited to this.

[0068] Specifically, in one embodiment, after the first air intake pump is controlled to continue to operate at the current air extraction volume for the first operating time and then stops, the gas sensor cleaning method provided by the embodiment of the present invention further includes the following steps:

[0069] Step S301: Acquire a second gas detection result of a gas sensor;

[0070] Step S302: determining whether the second gas detection result is consistent with the preset no-load detection result;

[0071] Specifically, when the second gas detection result is consistent with the preset no-load detection result, it is determined that the gas sensor has completed cleaning; when the second gas detection result is inconsistent with the preset no-load detection result, a gas sensor fault warning is issued. Thus, the actual cleaning time is flexibly adjusted to ensure the cleaning effect of the gas sensor. If the gas sensor still cannot achieve a good cleaning effect after cleaning, it means that the gas sensor itself may have a fault, and a fault alarm is processed to remind the user to replace the sensor as soon as possible to ensure the accuracy of the gas detection results and further improve the user experience.

[0072] Specifically, in one embodiment, after the cleaning of the gas sensor is completed, the gas sensor cleaning method provided by the embodiment of the present invention further includes the following steps:

[0073] Step S401: Control the second air intake pump to start and introduce the gas to be detected into the gas sensor.

[0074] Step S402: Controlling the air extraction volume of the second air intake pump according to the gas flow rate detected by the gas flow rate detection device, so that the gas flow rate meets the preset gas flow rate range, and completing the detection of the gas to be detected.

[0075] Specifically, the gas sensor cleaning system provided in the embodiment of the present invention can also assist the gas sensor in performing gas detection. By controlling the gas flow rate of the gas to be detected passing into the gas sensor, the sensitivity of the gas sensor can be guaranteed, so that the test sensitivity reaches the optimal effect and the accuracy of the detection results is improved.

[0076] The specific working process of the gas sensor cleaning system provided by the embodiment of the present invention will be described in detail below in combination with practical application examples.

[0077] By arranging a gas valve, an air intake pump, a gas flow rate detection device and a gas flow rate control device, i.e., the above-mentioned controller, in the gas channel connected to the gas sensor, the gas inlet and gas flow rate in the gas channel can be controlled. Figure 3 As shown, when the gas sensor array is turned on and enters the test phase, the gas valve A (i.e. Figure 1 The second gas valve 107 in the gas sensor is opened to start to let the gas to be detected flow into the gas sensor, and the air pump A (i.e. Figure 1The second air intake pump 106 in the apparatus draws gas into the gas channel, and the gas flow rate detection device detects the gas flow rate to see if it is within 2-2.5L / min (experiments show that the gas sensor has the highest sensitivity within this range). If the flow rate is greater than this range, the gas speed control device controls the air intake pump A to reduce the gas flow rate and reduce the air intake volume of the air intake pump A. If the flow rate is less than this range, the air intake volume of the air intake pump A is increased to speed up the flow rate in the gas channel. If the flow rate is reached, the gas reaches the gas sensor array to collect data.

[0078] The second part is to clean the gas sensor, complete the data collection, and open the external gas valve (i.e. Figure 1 The first gas valve 105 in the middle is used to pass clean gas from the outside to clean the gas sensor. The sampling time and flow rate are obtained by collecting data and analyzed, and then fed back to the gas speed control device to control the intake pump B (i.e. Figure 1 The gas flow rate detection device detects the gas flow rate and whether the gas flow rate is within the safe range of the cleaning sensor. If the flow rate is greater than the range, the gas speed control device reduces the gas flow rate of the intake pump B; if the flow rate is less than the range, the intake volume of the intake pump B is increased to speed up the flow rate in the gas channel. If it is judged to be safe, the sensor array is cleaned, and the gas speed control device controls the cleaning time of the gas sensor array by controlling the air extraction time of the intake pump B. When the cleaning stage is completed, the gas sensor is tested at no load, and the collected data is compared with the original no-load model in the database, and the deviation range is fed back. The cleaning time is delayed according to the feedback deviation range. When the deviation range is less than 0.1, the cleaning time is extended by 1 / α, and the flow rate remains unchanged; when the deviation range is between 0.1-0.3, the cleaning time is extended by 2 / α, and the flow rate remains unchanged; when the deviation range is between 0.3-0.5, the cleaning time is extended by 3 / α, and the flow rate remains unchanged; if it is not within the range, the user is reminded that the sensor needs to be replaced.

[0079] The gas flow rate is detected by the gas flow rate detection device. If the gas flow rate is too fast or too slow, the air intake pump is controlled to change the gas flow rate so that the test sensitivity of the gas sensor reaches the optimal effect. Fresh air is introduced to clean the gas sensor, and the cleaning time and speed are adjusted to achieve the optimal cleaning effect. The cleaning status is fed back through real-time data detection to confirm whether it is clean, and fault warnings are issued in time to improve user experience.

[0080] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A gas sensor cleaning device, characterized in that: include: A gas channel, a gas flow rate detection device, a first air intake pump and a controller, wherein: The first end of the gas channel is connected to the air inlet end of the gas sensor, and the second end is connected to the cleaning gas of the gas sensor through a first air inlet pump, and the first air inlet pump is used to adjust the cleaning time of the gas sensor and the flow rate of the cleaning gas flowing into the gas channel; The gas flow rate detection device is arranged in the gas channel; The first input end of the controller is connected to the gas flow rate detection device, the second input end is connected to the output end of the gas sensor, and the output end is connected to the control end of the first air intake pump. The controller is used to control the first air intake pump according to the gas flow rate detected by the gas flow rate detection device and the gas detection result of the gas sensor to complete the cleaning of the gas sensor. The controller adjusts the operating time of the first air intake pump based on the comparison between the gas detection result and the preset no-load detection result.

2. The gas sensor cleaning device according to claim 1, characterized in that: The second end of the gas channel is also provided with a first gas valve, and the first air intake pump is connected to the cleaning gas through the first gas valve.

3. The gas sensor cleaning device according to claim 1, characterized in that: Also includes: Second intake pump, The third end of the gas channel is connected to the gas to be detected by the gas sensor through the second air inlet pump; The third input end of the controller is connected to the control end of the second air intake pump, and the controller is also used to control the suction volume of the second air intake pump according to the gas flow rate detected by the gas flow rate detection device, so that the gas flow rate conforms to the preset gas flow rate range, thereby completing the detection of the gas to be detected.

4. The gas sensor cleaning device according to claim 3, characterized in that: A second gas valve is also provided at the third end of the gas channel, and the second air intake pump is connected to the gas to be detected through the second gas valve.

5. A gas sensor cleaning method, characterized in that: A controller for a gas sensor cleaning device as claimed in any one of claims 1 to 4, wherein the method comprises: When receiving a cleaning instruction of the gas sensor, controlling the first air inlet pump to open and supply cleaning gas to the gas sensor; The first air intake pump is controlled according to the gas flow rate detected by the gas flow rate detection device and the gas detection result of the gas sensor to complete the cleaning of the gas sensor.

6. The gas sensor cleaning method according to claim 5, characterized in that: The controlling the first air intake pump according to the gas flow rate detected by the gas flow rate detection device and the gas detection result of the gas sensor comprises: adjusting the first air inlet pump based on a relationship between the gas flow rate and a preset gas flow rate range; After the first air intake pump runs for a first time, obtaining a first gas detection result of the gas sensor; Based on the relationship between the first gas detection result and a preset no-load detection result of the gas sensor, the operation time of the first air intake pump is adjusted.

7. The gas sensor cleaning method according to claim 6, characterized in that: The adjusting the air extraction amount of the first air intake pump based on the relationship between the gas flow rate and the preset gas flow rate range includes: Determining whether the gas flow rate is within the preset gas flow rate range; When the gas flow rate is within the preset gas flow rate range, maintaining the current air pumping volume of the first air intake pump; When the gas flow rate is less than the minimum gas flow rate value of the preset gas flow rate range, increasing the current gas extraction volume of the first air intake pump, and returning to the step of determining whether the gas flow rate is within the preset gas flow rate range; When the gas flow rate is greater than the maximum gas flow rate value of the preset gas flow rate range, the current air suction volume of the first air intake pump is reduced, and the process returns to the step of determining whether the gas flow rate is within the preset gas flow rate range.

8. The gas sensor cleaning method according to claim 6, characterized in that: Adjusting the operation time of the first air intake pump based on the relationship between the first gas detection result and a preset no-load detection result of the gas sensor includes: Calculating a current deviation value between the first gas detection result and the preset no-load detection result; Based on the relationship between the preset deviation value and the running time, calculating the first running time corresponding to the current deviation value; The first air intake pump is controlled to continue running at the current air extraction volume for a first running time and then stop.

9. The gas sensor cleaning method according to claim 8, characterized in that: After controlling the first air intake pump to continue to operate for a first operating time at the current air extraction volume and then stop, the method further includes: Acquiring a second gas detection result of the gas sensor; Determining whether the second gas detection result is consistent with the preset no-load detection result; When the second gas detection result is consistent with the preset no-load detection result, determining that the gas sensor has completed cleaning; When the second gas detection result is inconsistent with the preset no-load detection result, a gas sensor failure warning is issued.

10. The gas sensor cleaning method according to any one of claims 5 to 9, characterized in that: After the cleaning of the gas sensor is completed, the method further includes: Control the second air inlet pump to open and introduce the gas to be detected into the gas sensor; The air extraction volume of the second air intake pump is controlled according to the gas flow rate detected by the gas flow rate detection device so that the gas flow rate meets the preset gas flow rate range, thereby completing the detection of the gas to be detected.

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