CN110333318B - Humidity compensation method and system for online detection system of smell in vehicle - Google Patents
Humidity compensation method and system for online detection system of smell in vehicle Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 28
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- 239000012895 dilution Substances 0.000 claims abstract description 36
- 238000005259 measurement Methods 0.000 claims abstract description 9
- 230000008859 change Effects 0.000 claims abstract description 7
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- 238000012544 monitoring process Methods 0.000 claims description 3
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- 239000007789 gas Substances 0.000 abstract description 84
- 150000001875 compounds Chemical class 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 description 16
- 239000012159 carrier gas Substances 0.000 description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 10
- 229920001296 polysiloxane Polymers 0.000 description 7
- 238000012937 correction Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000007791 dehumidification Methods 0.000 description 2
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- 229910052757 nitrogen Inorganic materials 0.000 description 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention provides a humidity compensation method and a humidity compensation system for an online detection system of smell in a vehicle, which perform linear fitting on gas concentration data of a sample to be detected under different dilution times, so as to compensate a gaseous compound concentration measurement error caused by humidity change according to a linear fitting coefficient. The humidity compensation method and the system are simple and flexible, are easy to operate, are suitable for humidity compensation of different types of gases, and can improve the accuracy of measurement of the concentration of the gas sample in the vehicle.
Description
Technical Field
The invention relates to the field of in-vehicle odor detection, in particular to a humidity compensation method and system for an in-vehicle odor on-line detection system.
Background
At present, the existing in-vehicle odor characterization method in the automobile industry is mainly based on human subjective evaluation, and has the problems of possible occupational health hazards, large subjective influence and poor statistics, and also has large problems in other technical aspects, so that the requirement of online odor detection cannot be met. The electronic nose system using the gas sensor as the detector has the advantages of rapidness, on-line and real-time measurement and the like, and has very wide application prospect. However, due to the gas sensor itself, the output signal fluctuates or drifts with environmental factors. Experiments show that: when the humidity exceeds a certain critical value, the gas sensor can have the phenomenon that the indication changes abnormally or even becomes zero along with the increase of the humidity, and the gas concentration can not be measured accurately. There are two common sensor humidity compensation methods, namely hardware level compensation and software level compensation. The compensation of the hardware level is mainly realized by utilizing certain components to compensate temperature and humidity when a hardware circuit is constructed, generally, the compensation is realized by connecting a load circuit with a humidity sensitive resistor in parallel or in series, and the compensation effect of the method is general and has no flexible operability. The compensation of the software level refers to a compensation algorithm, a corresponding correction curve or a function formula can be obtained by utilizing an interpolation or fitting method according to the humidity characteristic curve of the gas sensor, although the method is simple, the defects that the humidity characteristics of different gas samples are not obviously regulated by the sensor, the humidity characteristic priori information is less, all odor samples are difficult to cover, and the like exist.
Disclosure of Invention
In view of the above, the present invention is directed to a humidity compensation method and system for an online detection system of odor in a vehicle, which is simple, flexible, and easy to operate, and is suitable for humidity compensation of different types of gases, and can improve the accuracy of gas sample concentration measurement.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a humidity compensation method for an online detection system of smell in a vehicle comprises the following steps:
step A: acquiring a background concentration value of an environment where a sample to be detected is located;
and B: sampling and obtaining original gas of a sample to be detected through an in-vehicle smell online detection system;
and C: obtaining sample gas to be detected under different dilution times through an in-vehicle odor online detection system;
step D: measuring and obtaining gas concentration data of samples to be detected under different dilution times through an in-vehicle smell online detection system;
step E: performing linear fitting on the obtained gas concentration data of the sample to be measured under different dilution times, and drawing a fitting curve, wherein the fitting curve corresponds to the following formula:
y＝px+q，
wherein y is the gas concentration;
x is the reciprocal of the dilution factor;
p and q are linear fitting coefficients;
step F: and (3) carrying out humidity compensation on the sampling result of the in-vehicle smell on-line detection system according to the fitting curve, namely calculating a y value when x is 1, and taking the y value as a corrected gas concentration value to overcome the drift of a response value of the gas detector caused by humidity change.
Further, the method also comprises the following steps,
g: repeating the step B to obtain a plurality of original gas parallel samples of the sample to be detected;
step H: c, repeating the step C to obtain a plurality of parallel samples of the gas of the sample to be detected under different dilution times;
step I: obtaining a plurality of groups of gas concentration data of samples to be detected under different dilution times through detection;
step J: respectively performing linear fitting on the multiple groups of gas concentration data of the samples to be tested under different dilution times, which are obtained in the step I, and drawing a fitting curve;
step K: and respectively calculating multiple groups of sampling results of the on-line monitoring system for the smell in the vehicle according to the obtained fitting coefficients of the fitting curves to obtain multiple groups of corrected gas concentration data of the sample to be measured, and taking the average value of all the corrected gas concentration data of the sample to be measured as the gas concentration of the sample to be measured for final humidity compensation so as to compensate the concentration measurement error caused by humidity change.
Furthermore, the number of the selected dilution times is not less than 3.
Further, the selected number of the multiple groups of samples to be detected in the step I is not less than 3.
Use a system that is used for online detecting system's of smell humidity compensation method in car, including venturi, first adjusting valve, gaseous detector, first inlet channel, second inlet channel and second adjusting valve, the second inlet channel is through venturi and gaseous detector intercommunication, first inlet channel and gaseous detector intercommunication are equipped with second adjusting valve on this first inlet channel and the connecting passage of gaseous detector, first inlet channel still with the venturi intercommunication, and be equipped with first adjusting valve on first inlet channel and the venturi's the connecting passage.
Further, the gas detector is a PID detector.
Further, the first regulating valve is a needle valve.
Further, the first air inlet channel is a sample air inlet channel, and the second air inlet channel is a carrier gas inlet channel.
Furthermore, an activated carbon tube and a dehumidification silicone tube are arranged on a connecting passage of the second air inlet channel and the venturi tube.
Furthermore, a second electromagnetic valve is arranged on a connecting passage of the venturi tube and the gas detector, and a first electromagnetic valve is arranged on a connecting passage of the first air inlet passage and the first adjusting valve.
Compared with the prior art, the humidity compensation method and the humidity compensation system for the online detection system of the smell in the vehicle have the advantages that:
(1) according to the humidity compensation method for the online detection system of the smell in the vehicle, disclosed by the invention, the gas concentration of a sample to be detected is measured under different dilution times, namely different humidity concentrations, and then the gas concentration under the condition of no dilution is obtained by fitting and calculating gas concentration data under the condition of lower humidity with negligible humidity influence, so that the humidity compensation is performed on the gas of the sample to be detected in a targeted manner.
(2) When a plurality of groups of sample gas concentration data under different dilution times are obtained, the average value of the plurality of groups of corrected gas concentration data of the sample to be detected is used as the gas concentration of the sample to be detected for final humidity compensation, and the method can obviously enhance the accuracy of the obtained data and enhance the accuracy of the humidity compensation result.
(3) The method does not change the composition structure of the original online detection system for the smell in the vehicle, only adds steps on the using method, realizes the humidity compensation function of the online detection system for the smell in the vehicle, improves the performance of the system and increases the market competitiveness of the system.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation of the invention. In the drawings:
fig. 1 is a humidity compensation model for an online odor detection system in a vehicle according to embodiment 1 of the present invention;
fig. 2 is a humidity compensation model for an online detection system of smell in a vehicle according to embodiment 2 of the present invention;
fig. 3 is a humidity compensation model for an online detection system of smell in a vehicle according to embodiment 3 of the present invention;
FIG. 4 is a graph of the humidity characteristics of a VOC gas as described in example 3 of the present invention;
fig. 5 is a structural diagram of an online car smell detection system according to embodiments 1 to 4 of the present invention.
Description of reference numerals:
1-a venturi tube; 2-a first regulating valve; 3-a gas detector; 4-a first air intake passage; 5-a second intake passage; 6-a second regulating valve; 7-a first solenoid valve; 8-an activated carbon tube; 9-dehumidifying the silicone tube; 10-a second solenoid valve; 11-a third solenoid valve; 12-an air outlet channel;
a-sample gas; b-a carrier gas.
Detailed Description
The present invention will be described in detail with reference to examples.
Example 1:
the embodiment provides a humidity compensation method and a humidity compensation system for an online car smell detection system, as shown in fig. 5, the online car smell detection system uses a humidity compensation method system for an online car smell detection system, and includes a venturi tube 1, a first regulating valve 2, a gas detector 3, a first air inlet channel 4, a second air inlet channel 5 and a second regulating valve 6, the second air inlet channel 5 is communicated with the gas detector 3 through the venturi tube 1, the first air inlet channel 4 is communicated with the gas detector 3, a second regulating valve 6 is arranged on a connecting passage between the first air inlet channel 4 and the gas detector 3, the first air inlet channel 4 is further communicated with the venturi tube 1, and a first regulating valve 2 is arranged on a connecting passage between the first air inlet channel 4 and the venturi tube 1. Wherein the gas detector 3 is a PID detector, the first regulating valve 2 is a needle valve, the first gas inlet channel 4 is a sample gas inlet channel, the second gas inlet channel 5 is a carrier gas inlet channel, and the carrier gas b is nitrogen.
During gas detection, the first regulating valve 2 is closed, the second regulating valve 6 is opened, and the carrier gas b is not introduced, at the moment, the sample gas a flows through the first gas inlet channel 4 and the second regulating valve 6 and enters the gas detector 3 for detection; during humidity compensation, first adjusting valve 2 is opened, and second adjusting valve 6 is closed, and lets in carrier gas b this moment, and carrier gas b flows into venturi 1, and sample gas a flows through first adjusting valve 2 and gets into venturi 1 and mix with carrier gas b and then realize diluting, and the mist that obtains gets into gas detector 3 and detects, and adjustable first adjusting valve 2 controls suitable dilution multiple.
First adjusting valve 2 adopts the needle valve can tolerate bigger pressure than other types of valves, and sealing performance is good for also can guarantee the accuracy of adjusting when less flow or higher pressure gas's regulation, needle valve and venturi 1's cooperation is favorable to improving the accuracy that the dilution multiple was adjusted, and then improves the accuracy of humidity compensation.
Preferably, an activated carbon tube 8 and a dehumidifying silicone tube 9 are arranged on a connecting passage of the second air inlet channel 5 and the venturi tube 1, when a carrier gas b is introduced into the system, the carrier gas b sequentially passes through the second air inlet channel 5, the activated carbon tube 8 and the dehumidifying silicone tube 9 to enter the venturi tube 1, a second electromagnetic valve 10 is arranged on a connecting passage of the venturi tube 1 and the gas detector 3, and the start and stop of humidity compensation can be controlled by adjusting the on and off of the second electromagnetic valve 10. The arrangement of the activated carbon tube 8 and the dehumidifying silicone tube 9 can realize multi-layer filtering adsorption, so that organic impurities and moisture in the carrier gas b can be effectively removed, the influence on the humidity compensation result is avoided, and the humidity compensation accuracy is improved. The dehumidification silicone tube 9 is a drying tube filled with silicone particles.
Preferably, a first electromagnetic valve 7 is arranged on a connection path of the first air inlet channel 4 and the first regulating valve 2, and the cooperation of the first electromagnetic valve 7 and the second regulating valve 6 can be used for controlling the flow direction of the sample gas a.
Preferably, an air outlet channel 12 is arranged on a connection passage between the second regulating valve 6 and the gas detector 3, and a third electromagnetic valve 11 is arranged on the air outlet channel 12.
Preferably, the second regulating valve 6, the first electromagnetic valve 7 and the second electromagnetic valve 10 are normally open electromagnetic valves, and the third electromagnetic valve 11 is a normally closed electromagnetic valve. The normally-on electromagnetic valve is closed when not electrified and is opened when electrified, and the normally-off electromagnetic valve is opened when not electrified and is closed when electrified. When the humidity compensation is carried out, the knob switch is adjusted to enable the second adjusting valve 6 to be electrified, the first electromagnetic valve 7, the second electromagnetic valve 10 and the third electromagnetic valve 11 are not electrified, the normally open and normally closed electromagnetic valves are adopted to facilitate the on-off of the air circuit integrally controlled through electric control, the operation is simple and convenient, and the labor cost is reduced.
Under the condition that the relative humidity is 3.6% RH, the device is adopted to carry out the following humidity compensation when carrying out gas detection on a certain VOC sample:
step A: obtaining the background value concentration of the environment where the sample to be detected is located;
and B, step B: sampling and obtaining original gas of a sample to be detected through an in-vehicle smell online detection system;
step C: obtaining sample gas to be detected under different dilution times through an in-vehicle smell online detection system, wherein the dilution times are 27, 14, 10, 7, 5, 4 and 1;
wherein, the dilution multiple is the flow ratio of the sample gas and the dilution gas, for example, the flow of the sample gas a introduced into the device is 1L/min, the flow of the carrier gas b is 5L/min, and the dilution multiple is 6;
step D: the gas concentration data of the sample to be detected under different dilution times, such as 27, 14, 10, 7, 5, 4, 1, etc., are obtained by measuring through an in-vehicle smell online detection system, and are detailed in table 1, wherein the gas concentration value of the sample to be detected is the actual measurement value of the gas concentration of the sample to be detected-the environmental background concentration value measured in step a.
And E, step E: performing linear fitting on the obtained gas concentration data of the sample to be measured under different dilution times, and drawing a fitting curve, wherein as shown in fig. 1, the formula corresponding to the fitting curve is as follows:
y＝6.4657x-0.1178
step F: and (3) carrying out humidity compensation on the sampling result of the on-line detection system of the smell in the vehicle according to the fitting curve, and calculating to obtain that y is 6.347 when x is 1, namely the corrected VOC concentration is 6.347 ppm.
Table 1: VOC gas detection humidity compensation related data at 3.6% RH relative humidity.
Example 2:
the relative humidity is 41.5% RH, the gas to be measured, the online detection system, the humidity compensation method, or other conditions are the same as those in example 1, a fitting curve is obtained as shown in fig. 2, the formula corresponding to the fitting curve is y which is 5.7473x-0.0797, the corrected VOC concentration is 5.667ppm, and the detailed data related to humidity compensation are shown in table 2.
Table 2: VOC gas detection humidity compensation related data at 41.5% RH relative humidity.
Example 3:
the relative humidity is 73.1% RH, the gas to be measured, the online detection system, the humidity compensation method, or other conditions are the same as in example 1, a fitting curve is obtained as shown in fig. 3, the formula corresponding to the fitting curve is y-5.1163 x-0.027, the corrected VOC concentration is 5.089ppm, and the detailed data related to humidity compensation are shown in table 3.
Table 3: VOC gas detection humidity compensation related data at 73.1% RH.
Example 4:
the gas to be detected and the online detection system are the same as those in embodiment 1, and taking the case of humidity of 3.60% RH as an example, the humidity compensation method is as follows:
step A: obtaining the background value concentration of the environment where the sample to be detected is located;
and B: sampling and obtaining original gas of a sample to be detected through an in-vehicle smell online detection system;
step C: obtaining sample gas to be detected under different dilution times through an in-vehicle smell online detection system, wherein the dilution times are 27, 14, 10, 7, 5, 4 and 1;
step D: measuring and obtaining gas concentration data of samples to be detected under different dilution times of 27, 14, 10, 7, 5, 4, 1 and the like by using an in-vehicle smell online detection system;
step E: performing linear fitting on the obtained gas concentration data of the sample to be measured under different dilution times, and drawing a fitting curve;
step F: and (4) carrying out humidity compensation on the sampling result of the in-vehicle smell online detection system according to the fitting curve, and calculating a y value when x is equal to 1 to obtain the corrected VOC concentration of the first group.
G: repeating the step B to obtain 2 original gas parallel samples of the sample to be detected;
step H: repeating the step C to obtain 2 parallel samples of the gas of the sample to be detected under different dilution times;
step I: obtaining 2 groups of gas concentration data of samples to be detected under different dilution times through detection;
step J: respectively performing linear fitting on the 2 groups of gas concentration data of the samples to be tested under different dilution times, which are obtained in the step I, and drawing a fitting curve;
step K: and respectively correcting the 2 groups of sampling results of the on-line monitoring system for the smell in the vehicle according to the obtained linear fitting curve coefficients of the fitting curve to obtain a second group of corrected VOC concentration data and a third group of corrected VOC concentration data, and taking the average value of the first group of corrected VOC concentration data, the second group of corrected VOC concentration data and the third group of corrected VOC concentration data as the final VOC concentration after humidity compensation so as to compensate the concentration measurement error caused by humidity change.
In step D and step I, the concentration value of the sample gas to be measured is the actual measurement value of the concentration of the sample gas to be measured — the concentration value of the environmental background measured in step a.
The humidity-compensated VOC concentration values of each of the first, second and third groups were the same as in example 1, the VOC gas humidity characteristics are shown in fig. 4, and the detailed data on the humidity compensation of the VOC concentration at different humidity are shown in table 4.
Table 4: multi-group VOC gas detection humidity compensation related data under different humidity
It can be seen from fig. 4 and table 4 that the characteristic curve of the humidity of the VOC gas after correction is more stable than that before correction no matter the first group, the second group, the third group or the corrected average value is, and the influence of the humidity is obviously smaller, and the humidity compensation effect generated by adopting the device and the method is more and more obvious along with the increase of the humidity. In addition, the humidity characteristic curve corresponding to the corrected average value effectively avoids errors of a single group of corrected results, the accuracy of humidity compensation can be improved on the whole, and for example, the humidity characteristic curve for correcting the average value is obviously less influenced by humidity than the humidity characteristic curve for correcting the first group of humidity characteristic curves.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (3)
1. A humidity compensation method for an online detection system of smell in a vehicle is characterized by comprising the following steps: the method comprises the following steps:
step A: acquiring a background concentration value of an environment where a sample to be detected is located;
and B: sampling by an in-vehicle odor online detection system to obtain original gas of a sample to be detected;
step C: obtaining sample gas to be detected under different dilution times through an in-vehicle odor online detection system;
step D: measuring and obtaining gas concentration data of samples to be detected under different dilution times through an in-vehicle smell online detection system;
and E, step E: performing linear fitting on the obtained gas concentration data of the sample to be measured under different dilution times, and drawing a fitting curve, wherein the fitting curve corresponds to the following formula:
y=px+q，
wherein y is the gas concentration;
x is the reciprocal of the dilution factor;
p and q are linear fitting coefficients;
step F: carrying out humidity compensation on the sampling result of the on-line detection system of the smell in the vehicle according to the fitting curve, namely calculating a y value when x =1, and taking the y value as a corrected gas concentration value to overcome the drift of a response value of a gas detector caused by humidity change;
g: repeating the step B to obtain a plurality of original gas parallel samples of the sample to be detected;
step H: c, repeating the step C to obtain a plurality of parallel samples of the gas of the sample to be detected under different dilution times;
step I: obtaining a plurality of groups of gas concentration data of samples to be detected under different dilution times through detection;
step J: respectively performing linear fitting on the multiple groups of gas concentration data of the samples to be tested under different dilution times obtained in the step I, and drawing fitting curves;
step K: and respectively calculating multiple groups of sampling results of the on-line monitoring system for the smell in the vehicle according to the obtained fitting coefficients of the fitting curves to obtain multiple groups of corrected gas concentration data of the sample to be measured, and taking the average value of all the corrected gas concentration data of the sample to be measured as the gas concentration of the sample to be measured for final humidity compensation so as to compensate the concentration measurement error caused by humidity change.
2. The humidity compensation method for the on-line detection system of smell in the vehicle according to claim 1, wherein: the number of the selected dilution times is not less than 3.
3. The humidity compensation method for the on-line in-vehicle smell detection system according to claim 1, wherein: and I, selecting not less than 3 groups of the multiple groups of samples to be detected.
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