CN115902125A - Double-channel gas sensor - Google Patents
Double-channel gas sensor Download PDFInfo
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- CN115902125A CN115902125A CN202211734351.6A CN202211734351A CN115902125A CN 115902125 A CN115902125 A CN 115902125A CN 202211734351 A CN202211734351 A CN 202211734351A CN 115902125 A CN115902125 A CN 115902125A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
The invention relates to the technical field of automobile sensors, in particular to a double-channel gas sensor which comprises a shell, wherein the shell is provided with two air inlets and two air outlets, a mounting plate is arranged in the shell, two detection channels, two air channels and two airflow guide devices are arranged on the mounting plate, the detection channels are positioned on the front surface of the mounting plate, and the air channels are arranged on the back surface of the mounting plate; one end of each detection channel, which is close to the air inlet, is provided with a temperature detection module, the other end of each detection channel is provided with a PM2.5 detection module, the middle section of any detection channel is provided with an AQS detection module, and the position of any air channel, which is close to the outlet air, is provided with CO 2 And a detection module. The detection module of multiple gas has integrateed, CAN realize the detection of multiple gas, passes through CAN bus signal with the signal that detects and gives air conditioner controller, by the adjustment of air conditioner controller control air conditioner mode, perhaps controls opening of air purification system to realize the circulation of new trend system in the car, keep the fresh of the air in the whole car.
Description
Technical Field
The invention relates to the technical field of automobile sensors, in particular to a dual-channel gas sensor.
Background
The sensor is widely applied to systems of automobile power, chassis, automobile bodies and the like, in recent years, new energy automobiles with big fire are no exception, and the sensor plays an important role in an electronic adjusting system of the new energy automobiles. A car typically has tens to hundreds of sensors. Among them, the automotive gas sensor is the most important component. According to incomplete statistics, the number of gas sensors in the sensors used in the automobile engine accounts for more than 50%, and the number of large sensors reaches 5-6.
The air-conditioning controller needs to receive signals of the gas sensors for analysis at the same time so as to control the action of an air conditioner or an air purification system of the automobile, and has slow response and low efficiency.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the defects in the prior art are overcome, and a dual-channel gas sensor is provided.
The technical scheme adopted by the invention for solving the technical problems is as follows: a double-channel gas sensor comprises a shell, wherein two air inlets and two air outlets are formed in the shell, a mounting plate is arranged in the shell, two detection channels, two air channels and two airflow guiding devices are arranged on the mounting plate, the detection channels are located on the front side of the mounting plate, the air channels are arranged on the back side of the mounting plate, the airflow guiding devices are mounted in an area defined by the air channels, one end of each detection channel is communicated with the air inlet, the other end of each detection channel is communicated with one end of the air channel, and the other end of each air channel is communicated with the air outlets; one end of each detection channel, which is close to the air inlet, is provided with a temperature detection module, the other end of each detection channel is provided with a PM2.5 detection module, the middle section of any detection channel is provided with an AQS detection module, and the position of any air channel, which is close to the outlet air, is provided with CO 2 And a detection module.
Furthermore, the two detection channels are respectively a first detection channel and a second detection channel, the first detection channel and the second detection channel are both in a transverse V-shaped structure and are arranged oppositely, and the length of the second detection channel is larger than that of the first detection channel.
Further, the temperature detection module is an NTC thermistor.
Furthermore, an AQS detection module is arranged in the middle section of the first detection channel and mainly comprises an MEMS silicon-based heater, a nano material and a surface-mounted ceramic shell.
Furthermore, the AQS detection module is arranged at the middle section of the first detection channel through a gas-permeable and water-impermeable protective film.
Furthermore, the PM2.5 detection module comprises a laser tube and a PD receiving tube, the PD receiving tube is arranged on the detection channel and close to the connection part with the air channel, the laser tube is arranged on the mounting plate, and the laser emitted by the laser tube is opposite to the PD receiving tube.
Furthermore, the two air channels are respectively a first air channel and a second air channel, the first air channel and the second air channel are both in annular structures with notches, and CO is arranged at the position, close to the air outlet, of the second air channel 2 A detection module; the air flow guiding device is a centrifugal fan, and the two centrifugal fans are respectively arranged in the annular structures of the first air channel and the second air channel.
Further, the casing includes lower part open-ended last casing and upper portion open-ended lower casing, go up the casing lock joint on lower casing, the mounting panel sets up at lower casing and is close to the upper shed department.
Furthermore, two air inlets are transversely arranged on the upper part of the lower shell side by side, one air outlet is arranged on the lower part of the front end face of the lower shell, and the other air outlet is arranged on the lower part of the rear end face of the lower shell.
Furthermore, the two air inlets are provided with connecting pipes, and the air outlet at the lower part of the front end surface of the lower shell is also provided with a connecting pipe.
The invention has the beneficial effects that: the invention integrates the detection module of various gases, CAN realize the detection of various gases, transmits the detected signals to the air conditioner controller through the CAN bus signals, and controls the adjustment of the air conditioner mode or the opening of the air purification system by the air conditioner controller, thereby realizing the circulation of a fresh air system in the vehicle and keeping the freshness of the air in the whole vehicle.
Drawings
The invention is further illustrated with reference to the following figures and examples.
Fig. 1 is an external structural view of the present invention.
Fig. 2 is an assembly view of fig. 1.
Fig. 3 is a schematic structural view of the front side of the mounting plate in the present invention.
Fig. 4 is a schematic view of the reverse side of the mounting plate of the present invention.
Fig. 5 is a control block diagram of the present invention.
Figure 6 is a circuit schematic of the AQS detection module of the present invention.
In the figure: 10. the device comprises a shell, 101, an air inlet, 102, an air outlet, 20, a mounting plate, 201, a detection channel, 202, an air channel, 203, an air flow guiding device, 3, a temperature detection module, 4, PM2.5, 5, AQS and 6, CO 2 The detection device comprises a detection module, an upper shell, a lower shell, a connection pipe, 2011, a first detection channel, 2012, a second detection channel, 41, a laser pipe, 42, a PD receiving pipe, 2021, a first air channel and 2022, and a second air channel.
Detailed Description
The invention will now be further described with reference to the accompanying drawings and preferred embodiments. These drawings are simplified schematic diagrams each illustrating the basic structure of the present invention only in a schematic manner, and thus show only the constitution related to the present invention.
As shown in fig. 1 to 4, a dual-channel gas sensor includes a housing 10, the housing 10 has two air inlets 101 and two air outlets 102, a mounting plate 20 is disposed in the housing 10, the mounting plate 20 is provided with two detection channels 201, two air channels 202 and two air flow guiding devices 203, the detection channels 201 are located on the front surface of the mounting plate 20, the air channels 202 are disposed on the back surface of the mounting plate 20, the air flow guiding devices 203 are disposed in an area surrounded by the air channels 202, one end of the detection channel 201 is communicated with the air inlet 101, the other end thereof is communicated with one end of the air channel 202, and the other end of the air channel 202 is communicated with the air outlets 102;one end of the detection channel 201 close to the air inlet 101 is provided with a temperature detection module 3, the other end of the detection channel 201 is provided with a PM2.5 detection module 4, the middle section of any detection channel 201 is provided with an AQS detection module 5, and the position of any air channel 202 close to the outlet air 102 is provided with CO 2 And a detection module 6.
The housing 10 includes an upper housing 10a with an open lower portion and a lower housing 10b with an open upper portion, the upper housing 10a is fastened to the lower housing 10b, and the mounting plate 20 is disposed on the lower housing 10b near the upper opening. Two air inlets 101 are transversely arranged on the upper portion of the lower housing 10b side by side, one air outlet 102 is arranged on the lower portion of the front end face of the lower housing 10b, and the other air outlet 102 is arranged on the lower portion of the rear end face of the lower housing 10b. The two air inlets 102 are provided with connecting pipes 10c, and the air outlet 102 at the lower part of the front end surface of the lower shell 10b is also provided with a connecting pipe 10c.
As shown in fig. 3, the two detecting channels 201 are a first detecting channel 2011 and a second detecting channel 2012, the first detecting channel 2011 and the second detecting channel 2012 are both in a transverse V-shaped structure, and the two detecting channels are disposed oppositely, and the length of the second detecting channel 2012 is greater than the length of the first detecting channel 2011.
The PM2.5 detection module 4 comprises a laser tube 41 and a PD receiving tube 42, the PD receiving tube 42 is arranged on the detection channel 201 close to the connection part with the air duct 202, the laser tube 41 is arranged on the mounting plate 200, and the laser emitted by the laser tube is opposite to the PD receiving tube 42. The temperature detection module 3 is an NTC thermistor and can be used for detecting the temperature value in the current air environment, processing the temperature value by the MCU and sending the temperature value to the air conditioner through a bus signal to be used as a reference value of the temperature; meanwhile, the temperature value may be used as a temperature reference value of the temperature compensation algorithm of the PM2.5 detection module 4. An AQS detection module 5 is arranged at the middle section of the first detection channel 2011, and the AQS detection module 5 mainly comprises an MEMS silicon-based heater, a nano material and a surface-mounted ceramic shell. The AQS detection module 5 is disposed in the middle of the first detection channel 2011 through a gas-permeable and water-impermeable protective membrane.
As shown in fig. 4, the two air ducts 202 are respectively a first air duct 2021 and a second air duct 2022, the first air duct 2021 and the second air duct 2022 are both in an annular structure with a gap, and the second air duct 2022 is disposed near the air outlet 102CO 2 A detection module 6; the air flow guiding device 203 is a centrifugal fan, and two centrifugal fans are respectively arranged in the annular structure of the first air duct 2021 and the second air duct 2022.
1. under the action of the centrifugal fan, negative pressure is generated, and air enters the first detection channel 2011 from the air inlet 101 of the connecting pipe 10 c;
2. the air flows to the PD receiving tube 42 along the first detection channel 2011, and when the laser tube 41 emits laser, the passing dust receives an optical signal by the PD receiving tube 42 through a scattering principle, so that signal acquisition of PM2.5 concentration is realized, and the signal is sent to a corresponding processor;
3. the air continues to flow along the first test channel 2011 to the end and then to the back of the mounting plate 20;
4. the front air enters the first air duct 2021 and is then sucked into the lower layer by the centrifugal fan;
5. the air is discharged from the air outlet 102 at the lower portion of the front end surface of the lower housing 10b through the connection pipe 10c by the centrifugal fan.
1. under the action of the centrifugal fan, negative pressure is generated, and air enters the second detection channel 2012 from the air inlet 101 of the other connecting pipe 10 c; the air flows to the PD receiving tube 42 along the second detection channel 2012, and when the laser tube 41 emits laser light, the passing dust receives the light signal by the PD receiving tube 42 by the scattering principle, so as to realize signal acquisition of PM2.5 concentration, and send the signal to the corresponding processor;
2. the air continues to flow along the second detection channel 2012 to the end and then to the back of the mounting plate 20;
3. the front air enters the second air duct 2022 and is then sucked into the lower layer by the centrifugal fan;
4. the air is discharged from the air outlet 102 at the lower portion of the rear end surface of the lower housing 10b by the centrifugal fan.
As shown in fig. 5:
temperature detection by the temperature detection module 3: the NTC thermistors are respectively arranged at the air inlet positions of the first detection channel 2011 and the second detection channel 2012, can be used for detecting the temperature value in the current air environment, and are sent to the air conditioner through bus signals after being processed by the MCU to serve as the reference value of the temperature; meanwhile, the temperature value can be used as a temperature reference value of a temperature compensation algorithm of PM 2.5;
detection by AQS (NO, NH3, CO) detection module 5: in the first detection channel 2011, air passes through the air-permeable and water-impermeable protective membrane, a small amount of gas is detected by an NO, NH3 and CO detection source chip arranged inside, corresponding gas is converted into an electric signal and fed back to the MCU, and the electric signal is output to the air conditioner controller through a series of operations and processing by the MCU and a CAN signal;
CO 2 the detection module 6 detects: in the second detecting channel 2012, a CO2 detecting module is disposed at the air outlet 102 at the lower portion of the rear end surface of the lower casing 10b under the action of the centrifugal fan, so that CO flowing through the air can be detected 2 The concentration value is fed back to the MCU, and the MCU performs operation and processing and outputs the concentration value to the air conditioner controller through a CAN signal.
Wherein, the PM2.5 detection module 4 indirectly detects the dust particle concentration in the air by adopting an optical method. The particle in the air can produce the light scattering when the photoelectricity region of flowing through, and its scattering intensity has mathematical relation (mie scattering) with the particle size, and statistics single time flows through the particle quantity in wind channel, can calculate the concentration of the particle in the air. According to the simulation result evaluation, the air speed of the area of the temperature detection module 3 at the air inlet 101 is larger than or equal to 1.5m/s, the air fluidity can be effectively enhanced, and accurate data guarantee is provided for temperature test and real-time air PM2.5 concentration detection.
As shown in fig. 6, the AQS detection module 5 mainly includes a MEMS silicon-based heater, a nano material, and a surface-mounted ceramic housing, using the operating principle of MEMS, so as to detect different gases. When the sensor works in a clean air environment stably, the sensitive resistance of the sensor at the moment is set as the reference resistance (R0) of the sensor, once the gas to be detected exists in the air, the conductivity of the semiconductor material changes, and the sensitive resistance (Rs) of the sensor also changes accordingly. And (3) mapping and calculating the concentration of the measured gas according to the ratio of the sensor sensitive resistance (Rs) and the sensor reference resistance (R0). The sensor basic detection circuit mainly comprises a heater voltage (Vh), a loop measurement voltage (Vc) and a load matching resistor (Rm). The heater voltage (Vh) is used to activate and maintain the sensitivity of the nanomaterial and the loop measurement voltage (Vc) in combination with the load matching resistance (Rm) is used to determine the load matching voltage (Vm). The sensor sensing resistance (Rs) can be calculated from the measured value of the load matching voltage (Vm), i.e.:
CO 2 the detection module 6 is similar to the PM2.5 detection module 4 in principle, and integrates a temperature and humidity sensor to perform relevant compensation acquisition by using an infrared laser emission principle; an integrated MEMS chip is used, a temperature and humidity sensor is integrated on the chip, the temperature and humidity sensor is used as a compensation signal, and CO is output through the IIC 2 And a concentration value and a temperature and humidity signal can be output.
The above-mentioned embodiments are only for illustrating the technical idea and features of the present invention, and the purpose of the present invention is to enable those skilled in the art to understand the content of the present invention and implement the present invention, and not to limit the protection scope of the present invention by this, and all equivalent changes or modifications made according to the spirit of the present invention should be covered in the protection scope of the present invention.
Claims (10)
1. A dual channel gas sensor, comprising a housing, characterized in that: the air duct is arranged on the back of the mounting plate, the air flow guiding device is arranged in an area defined by the air duct, one end of the detection channel is communicated with the air inlet, the other end of the detection channel is communicated with one end of the air duct, and the other end of the air duct is communicated with the air outlet; one end of the detection channel, which is close to the air inlet, is provided with a temperature detection module, the other end of the detection channel is provided with a PM2.5 detection module, and any detection channelThe middle section of the air conditioner is provided with an AQS detection module, and the position of any air channel close to the outlet air is provided with CO 2 And a detection module.
2. A dual channel gas sensor as claimed in claim 1, wherein: the two detection channels are respectively a first detection channel and a second detection channel, the first detection channel and the second detection channel are both in transverse V-shaped structures and are arranged oppositely, and the length of the second detection channel is larger than that of the first detection channel.
3. A dual channel gas sensor as claimed in claim 1 or 2, wherein: the temperature detection module is an NTC thermistor.
4. A dual channel gas sensor as claimed in claim 2, wherein: the middle section of the first detection channel is provided with an AQS detection module which mainly comprises an MEMS silicon-based heater, a nano material and a surface-mounted ceramic shell.
5. The dual channel gas sensor of claim 4, wherein: the AQS detection module is arranged at the middle section of the first detection channel through a breathable and waterproof protective film.
6. A dual channel gas sensor as claimed in claim 2, wherein: the PM2.5 detection module comprises a laser tube and a PD receiving tube, the PD receiving tube is arranged on the detection channel and close to the joint of the detection channel and the air channel, the laser tube is arranged on the mounting plate, and laser emitted by the laser tube is over against the PD receiving tube.
7. The dual channel gas sensor of claim 1, wherein: the two air channels are respectively a first air channel and a second air channel, the first air channel and the second air channel are both in annular structures with notches, and CO is arranged at the position, close to the air outlet, of the second air channel 2 A detection module; the air flow guiding device isAnd the two centrifugal fans are respectively arranged in the annular structures of the first air channel and the second air channel.
8. A dual channel gas sensor as claimed in claim 1, wherein: the shell comprises an upper shell with an opening at the lower part and a lower shell with an opening at the upper part, the upper shell is buckled on the lower shell, and the mounting plate is arranged at the position, close to the upper opening, of the lower shell.
9. A dual channel gas sensor as claimed in claim 8, wherein: two air inlets are transversely arranged on the upper part of the lower shell side by side, one air outlet is arranged on the lower part of the front end face of the lower shell, and the other air outlet is arranged on the lower part of the rear end face of the lower shell.
10. A dual channel gas sensor as claimed in claim 9, wherein: the two air inlets are provided with connecting pipes, and the air outlet at the lower part of the front end surface of the lower shell is also provided with a connecting pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211734351.6A CN115902125A (en) | 2022-12-31 | 2022-12-31 | Double-channel gas sensor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211734351.6A CN115902125A (en) | 2022-12-31 | 2022-12-31 | Double-channel gas sensor |
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| CN115902125A true CN115902125A (en) | 2023-04-04 |
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| CN202211734351.6A Pending CN115902125A (en) | 2022-12-31 | 2022-12-31 | Double-channel gas sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117664864A (en) * | 2024-01-31 | 2024-03-08 | 上海烨映微电子科技股份有限公司 | Gas detection device |
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- 2022-12-31 CN CN202211734351.6A patent/CN115902125A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117664864A (en) * | 2024-01-31 | 2024-03-08 | 上海烨映微电子科技股份有限公司 | Gas detection device |
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