Two-channel PM2.5 sensor air inlet flow compensation method and vehicle

Abstract

The invention relates to the technical field of two-channel PM2.5 sensors, in particular to a two-channel PM2.5 sensor air inlet flow compensation method and a vehicle, and the method comprises the following steps: whole vehicle mode recognition: if a whole vehicle is in a static mode, a static compensation strategy is adopted to compensate a PM2.5 concentration sampling value of an external sampling channel; if the whole vehicle is in the dynamic mode, a dynamic compensation strategy is adopted to compensate the PM2.5 concentration sampling value of the external sampling channel; according to the invention, the influence of air inlet flow difference caused by different vehicle speeds, different vehicle body structure designs and different sensor mounting positions can be improved without adjusting the product structure.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of double-channel PM2.5 sensor, in particular to a double-channel PM2.5 sensor air intake flow compensation method and vehicle. BACKGROUND

[0002] The core of the double-channel PM2.5 sensor is to use the laser scattering principle, which can monitor the PM2.5 concentration inside and outside the vehicle at the same time. The double-channel PM2.5 sensor can intelligently switch between internal and external circulation in the automobile air circulation system. In the process of measuring PM2.5, the stability of the air intake flow (i.e. the volume of air passing through the sampling port per unit time) is crucial. Fluctuations and deviations in air intake flow will directly affect the particle collection efficiency and the measurement results of the light scattering sensor, thereby causing inaccurate concentration readings.

[0003] During vehicle driving, the air intake flow of the double-channel PM2.5 sensor will fluctuate and deviate at different vehicle speeds, thereby affecting the accuracy of the concentration readings. In addition, various vehicles on the market have their own unique body structure designs, resulting in differences in the installation position of the double-channel PM2.5 sensor. Different body structure designs and sensor installation positions cause fluctuations and deviations in the air intake flow of the double-channel PM2.5 sensor. In order to ensure the accuracy of the concentration measurement, the existing solution mainly changes the sensor product structure, such as adjusting the air duct and air intake pipeline of the sensor, to achieve uniform air intake flow of the double-channel PM2.5 sensor. However, the above solution significantly reduces the universality of the product and greatly increases the manufacturing cost. SUMMARY

[0004] The technical problem to be solved by the present application is to overcome the shortcomings of the prior art and provide a double-channel PM2.5 sensor air intake flow compensation method and vehicle that does not require adjusting the product structure to improve the influence of air intake flow differences caused by different vehicle speeds, different body structure designs, and different sensor installation positions.

[0005] The technical solution adopted by the present application to solve the technical problem is a double-channel PM2.5 sensor air intake flow compensation method, wherein the double-channel PM2.5 sensor includes an internal sampling channel connected to the vehicle's air conditioner and an external sampling channel extending to the outside of the vehicle; comprising the following steps:

[0006] Whole vehicle mode recognition: if the whole vehicle is in a static mode, a static compensation strategy is used to compensate the PM2.5 concentration sampling value of the external sampling channel; if the whole vehicle is in a dynamic mode, a dynamic compensation strategy is used to compensate the PM2.5 concentration sampling value of the external sampling channel.

[0007] Further, the static compensation strategy includes:

[0008] When the vehicle is in a static state and the PM2.5 concentration sampling values of the inner sampling channel and the outer sampling channel are both lower than the preset concentration L, the PM2.5 concentration sampling value of the outer sampling channel is corrected according to the PM2.5 concentration sampling value of the inner sampling channel.

[0009] When the vehicle is in a low-speed state and the PM2.5 concentration sampling value of the outer sampling channel is higher than the preset concentration L, the PM2.5 concentration sampling value of the outer sampling channel is compensated by a compensation factor 2.

[0010] Further, the process of correcting the PM2.5 concentration sampling value of the outer sampling channel according to the PM2.5 concentration sampling value of the inner sampling channel is as follows:

[0011] When the PM2.5 concentration sampling value of the outer sampling channel is higher than the PM2.5 concentration sampling value of the inner sampling channel, the PM2.5 concentration sampling value of the outer sampling channel is not adjusted.

[0012] When the PM2.5 concentration sampling value of the outer sampling channel is lower than the PM2.5 concentration sampling value of the inner sampling channel, the PM2.5 concentration sampling value of the outer sampling channel takes the PM2.5 concentration sampling value of the inner sampling channel.

[0013] Further, the dynamic compensation strategy includes:

[0014] When the vehicle is in a medium-speed state and the PM2.5 concentration sampling value of the outer sampling channel is higher than the preset concentration L, the PM2.5 concentration sampling value of the outer sampling channel is compensated according to a compensation reference curve.

[0015] When the vehicle is in a high-speed state and the PM2.5 concentration sampling value of the outer sampling channel is higher than the preset concentration L, the PM2.5 concentration sampling value of the outer sampling channel is not compensated.

[0016] Further, the compensation reference curve is a curve between vehicle speed and compensation factor.

[0017] Further, in the static mode, the vehicle speed is lower than a preset speed V1; in the dynamic mode, the vehicle speed is not lower than the preset speed V1.

[0018] Further, in the static mode, when the vehicle speed is greater than zero and lower than the preset speed V1, the vehicle is in a low-speed state; in the dynamic mode, when the vehicle speed is greater than a preset speed V2, the vehicle is in a high-speed state, otherwise the vehicle is in a medium-speed state.

[0019] Further, the preset speed V1 is 5 km / h, and the preset speed V2 is 30 km / h.

[0020] Further, the preset concentration L takes a value of 20ug / m 3 .

[0021] A vehicle adopts the double-channel PM2.5 sensor air flow compensation method.

[0022] The beneficial effects of the present application are:

[0023] The present application adopts a static compensation strategy to compensate the PM2.5 concentration sampling value of the outer sampling channel when the whole vehicle is in a static mode, and adopts a dynamic compensation strategy to compensate the PM2.5 concentration sampling value of the outer sampling channel when the whole vehicle is in a dynamic mode, which significantly improves the influence of the air flow difference caused by different vehicle speeds, different vehicle body structure designs and different sensor installation positions, ensures the accuracy and stability of the concentration measurement, does not need to adjust the product structure, improves the universality of the product, and significantly reduces the manufacturing cost. BRIEF DESCRIPTION OF DRAWINGS

[0024] The present application will be further described below in combination with the drawings and embodiments.

[0025] Figure 1 is the working flow chart of the double-channel PM2.5 sensor air flow compensation method in the present application;

[0026] Figure 2 is a schematic diagram of the compensation reference curve in the present application. DETAILED DESCRIPTION

[0027] The present application will be further described below in combination with the drawings and embodiments. These drawings are all simplified schematic diagrams, and only schematically show the basic structure of the present application, and thus only show the configurations related to the present application.

[0028] Embodiment 1

[0029] A double-channel PM2.5 sensor air flow compensation method, the double-channel PM2.5 sensor includes an inner sampling channel connected to the air conditioner in the vehicle and an outer sampling channel extending to the outside of the vehicle; comprising the following steps:

[0030] Whole vehicle mode recognition: if the whole vehicle is in a static mode, a static compensation strategy is adopted to compensate the PM2.5 concentration sampling value of the outer sampling channel; if the whole vehicle is in a dynamic mode, a dynamic compensation strategy is adopted to compensate the PM2.5 concentration sampling value of the outer sampling channel.

[0031] Specifically, the inner sampling channel is connected to the air outlet of the vehicle air conditioner by a 100mm hose to collect the PM2.5 concentration inside the vehicle; the outer sampling channel is led out of the vehicle by a 500mm hose to collect the PM2.5 concentration outside the vehicle; in the static mode, the vehicle speed is lower than the preset speed V1: when the vehicle speed is greater than zero and lower than the preset speed V1, the vehicle is in a low speed state; in the dynamic mode, the vehicle speed is not lower than the preset speed V1: when the vehicle speed is greater than the preset speed V2 (> V1), the vehicle is in a high speed state, otherwise the vehicle is in a medium speed state; the preset speed V1 is 5km / h, and the preset speed V2 is 30km / h.

[0032] The static compensation strategy is used to compensate the PM2.5 concentration sampling value of the outer sampling channel when the whole vehicle is in the static mode, and the dynamic compensation strategy is used to compensate the PM2.5 concentration sampling value of the outer sampling channel when the whole vehicle is in the dynamic mode, which significantly improves the influence of the intake flow difference caused by different vehicle speeds, different vehicle body structure designs and different sensor installation positions, ensures the accuracy and stability of the concentration measurement, does not need to adjust the product structure, improves the universality of the product, and significantly reduces the manufacturing cost.

[0033] The static compensation strategy includes:

[0034] When the vehicle is in a static state (i.e. the vehicle speed is zero) and the PM2.5 concentration sampling values of the inner sampling channel and the outer sampling channel are both lower than the preset concentration L, then the PM2.5 concentration sampling value of the outer sampling channel is corrected according to the PM2.5 concentration sampling value of the inner sampling channel.

[0035] When the vehicle is in a low speed state and the PM2.5 concentration sampling value of the outer sampling channel is higher than the preset concentration L, then the PM2.5 concentration sampling value of the outer sampling channel is compensated by a compensation coefficient 2, i.e. the PM2.5 concentration sampling value of the outer sampling channel is equal to the PM2.5 concentration sampling value of the inner sampling channel multiplied by 2.

[0036] Specifically, the preset concentration L is 20ug / m 3 The reason for selecting the PM2.5 concentration sampling value of the inner sampling channel as the compensation reference is that the vehicle interior is not affected by the airflow.

[0037] The process of correcting the PM2.5 concentration sampling value of the outer sampling channel according to the PM2.5 concentration sampling value of the inner sampling channel is as follows:

[0038] When the PM2.5 concentration sampling value of the outer sampling channel is higher than the PM2.5 concentration sampling value of the inner sampling channel, the PM2.5 concentration sampling value of the outer sampling channel is not adjusted;

[0039] When the PM2.5 concentration sampling value of the external sampling channel is lower than the PM2.5 concentration sampling value of the internal sampling channel, the PM2.5 concentration sampling value of the external sampling channel shall be the PM2.5 concentration sampling value of the internal sampling channel.

[0040] Dynamic compensation strategies include:

[0041] When the vehicle is at a medium speed and the PM2.5 concentration sampling value of the external sampling channel is higher than the preset concentration L, the PM2.5 concentration sampling value of the external sampling channel is compensated according to the compensation reference curve;

[0042] When the vehicle is in a high-speed state and the PM2.5 concentration sampling value of the external sampling channel is higher than the preset concentration L, the PM2.5 concentration sampling value of the external sampling channel is not compensated.

[0043] Specifically, such as Figure 2 As shown in FIG, the compensation reference curve is a curve between vehicle speed and compensation coefficient, which is obtained by fitting the statistical data of actual vehicle experiments.

[0044] like Figure 1 As shown, when working, the vehicle mode is first determined based on the vehicle speed. If the vehicle speed is lower than the preset speed V1, the vehicle is in static mode, otherwise the vehicle is in dynamic mode. If the vehicle is in static mode, when the vehicle is stationary and the PM2.5 concentration sampling values ​​of the inner sampling channel and the outer sampling channel are both lower than the preset concentration L, the PM2.5 concentration sampling value of the outer sampling channel is corrected based on the PM2.5 concentration sampling value of the inner sampling channel: when the PM2.5 concentration sampling value of the outer sampling channel is higher than the PM2.5 concentration sampling value of the inner sampling channel, the PM2.5 concentration sampling value of the outer sampling channel is not adjusted; when the PM2.5 concentration sampling value of the outer sampling channel is lower than the PM2.5 concentration sampling value of the inner sampling channel, the PM2.5 concentration sampling value of the outer sampling channel is the PM2.5 concentration sampling value of the inner sampling channel; when the vehicle is at a low speed and the PM2.5 concentration sampling value of the outer sampling channel is higher than the preset concentration L, the PM2.5 concentration sampling value of the outer sampling channel is compensated according to the compensation coefficient 2. If the vehicle is in dynamic mode, when the vehicle is in medium speed and the PM2.5 concentration sampling value of the external sampling channel is higher than the preset concentration L, the PM2.5 concentration sampling value of the external sampling channel is compensated according to the compensation reference curve; when the vehicle is in high speed and the PM2.5 concentration sampling value of the external sampling channel is higher than the preset concentration L, the PM2.5 concentration sampling value of the external sampling channel is not compensated.

[0045] Example 2

[0046] A vehicle adopts the dual-channel PM2.5 sensor intake flow compensation method of Example 1.

[0047] The above examples are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application shall be covered within the protection scope of the present application.

Claims

1. A dual-channel PM2.5 sensor intake flow compensation method, wherein the dual-channel PM2.5 sensor includes an inner sampling channel connected to the air conditioner in the vehicle and an outer sampling channel extending to the outside of the vehicle; characterized in that The steps include: Vehicle mode recognition: If the vehicle is in static mode, the static compensation strategy is used to compensate the PM2.5 concentration sampling value of the external sampling channel; if the vehicle is in dynamic mode, the dynamic compensation strategy is used to compensate the PM2.5 concentration sampling value of the external sampling channel.

2. The dual-channel PM2.5 sensor intake flow compensation method according to claim 1, characterized in that: The static compensation strategy includes: When the vehicle is stationary and the PM2.5 concentration sampling values ​​of the inner sampling channel and the outer sampling channel are both lower than the preset concentration L, the PM2.5 concentration sampling value of the outer sampling channel is corrected according to the PM2.5 concentration sampling value of the inner sampling channel; When the vehicle is in a low-speed state and the PM2.5 concentration sampling value of the external sampling channel is higher than the preset concentration L, the PM2.5 concentration sampling value of the external sampling channel is compensated according to the compensation coefficient 2.

3. The dual-channel PM2.5 sensor intake flow compensation method according to claim 2, characterized in that: The process of correcting the PM2.5 concentration sampling value of the external sampling channel based on the PM2.5 concentration sampling value of the internal sampling channel is as follows: When the PM2.5 concentration sampling value of the external sampling channel is higher than the PM2.5 concentration sampling value of the internal sampling channel, the PM2.5 concentration sampling value of the external sampling channel will not be adjusted; When the PM2.5 concentration sampling value of the external sampling channel is lower than the PM2.5 concentration sampling value of the internal sampling channel, the PM2.5 concentration sampling value of the external sampling channel shall be the PM2.5 concentration sampling value of the internal sampling channel.

4. The dual-channel PM2.5 sensor intake flow compensation method according to claim 1, characterized in that: The dynamic compensation strategy includes: When the vehicle is at a medium speed and the PM2.5 concentration sampling value of the external sampling channel is higher than the preset concentration L, the PM2.5 concentration sampling value of the external sampling channel is compensated according to the compensation reference curve; When the vehicle is in a high-speed state and the PM2.5 concentration sampling value of the external sampling channel is higher than the preset concentration L, the PM2.5 concentration sampling value of the external sampling channel is not compensated.

5. The dual-channel PM2.5 sensor intake flow compensation method according to claim 4, characterized in that: The compensation reference curve is a curve between vehicle speed and compensation coefficient.

6. The dual-channel PM2.5 sensor intake flow compensation method according to claim 1, characterized in that: In the static mode, the vehicle speed is lower than the preset speed V1; in the dynamic mode, the vehicle speed is not lower than the preset speed V1.

7. The dual-channel PM2.5 sensor intake flow compensation method according to claim 6, characterized in that: In the static mode, when the vehicle speed is greater than zero and lower than the preset speed V1, the vehicle is in a low-speed state; in the dynamic mode, when the vehicle speed is greater than the preset speed V2, the vehicle is in a high-speed state, otherwise the vehicle is in a medium-speed state.

8. The dual-channel PM2.5 sensor intake flow compensation method according to claim 7, characterized in that: The preset speed V1 is 5 km / h, and the preset speed V2 is 30 km / h.

9. The dual-channel PM2.5 sensor intake flow compensation method according to claim 2, characterized in that: The preset concentration L is 20ug / m 3 .

10. A vehicle, characterized in that: The dual-channel PM2.5 sensor intake flow compensation method according to any one of claims 1 to 9 is adopted.

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