Vehicle-mounted electronic nose constant temperature device, vehicle-mounted drunk driving detection electronic nose and vehicle

Abstract

The present application provides an in-vehicle electronic nose thermostat, an in-vehicle drunk driving detection electronic nose, and an automobile. The in-vehicle electronic nose thermostat comprises: a preheating assembly and a thermostat chamber; the preheating outlet of the preheating assembly is connected to the thermostat chamber air inlet of the thermostat chamber; the preheating assembly is used to preheat the inflowing gas; and the thermostat chamber is used to control the temperature of the gas preheated by the preheating assembly so that the temperature of the gas entering the thermostat chamber is within a preset range. The in-vehicle electronic nose thermostat provided by the present application uses a special bionic preheating assembly to fully heat the cold gas before entering the electronic nose system. Combined with the thermostat chamber, it effectively ensures that the temperature inside the chamber rises rapidly and remains at a constant and appropriate temperature, thereby solving the problem of erroneous or inaccurate electronic nose detection results in extremely cold environments.

Description

Technical Field

[0001] One or more embodiments of this specification relate to the technical field of vehicle-mounted drunk driving detection, and in particular, to a vehicle-mounted electronic nose constant temperature device, a vehicle-mounted drunk driving detection electronic nose, and a vehicle. Background Art

[0002] In recent years, driving safety issues such as drunk driving have garnered widespread attention. Currently, civilian vehicles require a cabin odor sensor to identify drivers who are under the influence of alcohol before they enter the vehicle. Electronic noses are one type of in-vehicle drunk driving detection system that is easy to install and can accurately and quickly detect drunk driving. However, due to low temperatures or even extreme cold weather in some parts of the world during winter, the resistance of the metal oxide semiconductor sensor, the core component of the electronic nose, increases, resulting in signal drift, leading to misclassification and inaccurate measurement results. Therefore, maintaining a constant and suitable temperature environment for the electronic nose is crucial in extremely cold environments. Existing methods incorporate temperature control modules into gas sensor circuits, but this approach results in uneven heating of the circuit, excessive device size, and unstable temperature control. Algorithmic temperature compensation is widely used for sensor temperature compensation due to its cost-effectiveness and high accuracy. However, the temperature compensation range is limited, and algorithmic temperature compensation cannot meet the operating requirements of electronic nose detection systems in extremely cold environments.

[0003] Therefore, it is desired to have a technical solution to overcome or at least alleviate at least one of the above-mentioned deficiencies of the prior art. Summary of the Invention

[0004] In view of this, an object of one or more embodiments of this specification is to provide a vehicle-mounted electronic nose thermostat, a vehicle-mounted drunk driving detection electronic nose, and a vehicle to solve at least one of the above problems.

[0005] Based on the above purpose, one or more embodiments of this specification provide a vehicle-mounted electronic nose constant temperature device, the vehicle-mounted electronic nose constant temperature device comprising: a preheating component and a constant temperature chamber;

[0006] The preheating air outlet of the preheating assembly is connected to the constant temperature chamber air inlet of the constant temperature chamber; wherein,

[0007] The preheating component is used to preheat the inflowing gas;

[0008] The constant temperature chamber is used to control the temperature of the gas preheated by the preheating assembly so that the temperature of the gas entering the constant temperature chamber is within a preset range.

[0009] Optionally, the preheating assembly comprises: a preheating channel and at least one first heating element;

[0010] The preheating channel includes at least one preheating chamber, a preheating air inlet and a preheating air outlet;

[0011] The preheating air inlet is provided on one side of the preheating chamber and is communicated with the interior of the preheating chamber;

[0012] The preheating air outlet is provided at the other side of the preheating chamber and is communicated with the interior of the preheating chamber;

[0013] The first heating element is arranged outside the side wall of the preheating chamber.

[0014] Optionally, the preheating channel further comprises: a wing plate disposed inside the preheating chamber;

[0015] A first slot is provided on the outside of the side wall of one side of the wing plate, and the first heating element is plugged into the first slot;

[0016] A second slot is provided on the outside of the side wall on the other side of the wing plate, and one of the first heating elements is plugged into the second slot.

[0017] Optionally, the number of the preheating chambers is three.

[0018] Optionally, the constant temperature chamber comprises: an outer shell, a heat-insulating layer, a second heating element and an inner shell;

[0019] The thermal insulation layer is sleeved inside the shell;

[0020] The inner shell is arranged inside the thermal insulation layer;

[0021] The second heating element is arranged in the gap between the thermal insulation layer and the inner shell.

[0022] Optionally, the housing includes a housing body and a side cover;

[0023] The side cover is arranged on one side of the housing body;

[0024] The air inlet of the constant temperature chamber is arranged on the side cover.

[0025] Optionally, the inner shell is a cylindrical structure with a side wall provided with a plurality of through holes.

[0026] Optionally, the thermal insulation layer is woven from hollow fibers.

[0027] In another aspect of the present application, there is also provided an on-vehicle drunk driving detection electronic nose, the on-vehicle drunk driving detection electronic nose comprising a controller, a sensor and the on-vehicle electronic nose constant temperature device described above;

[0028] The sensor is arranged inside the inner shell of the vehicle-mounted electronic nose thermostat and is used to detect the alcohol content of the gas and generate an electronic signal;

[0029] The controller is used to obtain the electronic signal generated by the sensor and calculate the alcohol detection result according to the electronic signal.

[0030] In another aspect of the present application, a car is provided, comprising the above-mentioned on-board electronic nose for detecting drunk driving.

[0031] The beneficial effects of this application are as follows:

[0032] The vehicle-mounted electronic nose constant temperature device provided in the present application uses a special bionic pre-heating component to fully heat the cold gas before entering the electronic nose system. Combined with the constant temperature chamber, it effectively ensures that the temperature inside the chamber rises rapidly and remains at a constant and appropriate temperature, solving the problem of erroneous or inaccurate electronic nose detection results in extremely cold environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate one or more embodiments of this specification or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only one or more embodiments of this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 A schematic diagram of a vehicle-mounted electronic nose thermostat provided in one or more embodiments of this specification;

[0035] Figure 2 A perspective schematic diagram of a preheating assembly provided for one or more embodiments of this specification;

[0036] Figure 3 A side view of a preheating assembly provided for one or more embodiments of the present specification;

[0037] Figure 4 A schematic cross-sectional view of a preheating assembly from a BB direction perspective provided in one or more embodiments of this specification;

[0038] Figure 5 A schematic cross-sectional view of a preheating assembly from the AA direction provided in one or more embodiments of this specification;

[0039] Figure 6 A schematic cross-sectional view of a constant temperature chamber provided for one or more embodiments of this specification;

[0040] Figure 7 A schematic diagram of a side cover provided for one or more embodiments of this specification;

[0041] Figure 8 A schematic diagram of a housing body provided for one or more embodiments of this specification;

[0042] Figure 9 A schematic diagram of an inner shell provided for one or more embodiments of this specification;

[0043] Figure 10 A schematic diagram of the structure of the thermal insulation layer provided in one or more embodiments of this specification;

[0044] Figure 11 A more specific controller structure diagram is provided for one or more embodiments of this specification.

[0045] The following are the descriptions of the reference numerals:

[0046] Preheating component A; side cover B, outer shell body C, inner shell D, second heating element E, insulation layer F, preheating chamber a1, preheating air inlet 2, preheating air outlet 1, wing plate 8, through hole d1, first heating element a5, first limiting part 4, second limiting part 6, third limiting part 3, fourth limiting part 5, first circular hole 11, second circular hole 12, third circular hole 13, constant temperature chamber air inlet 10. DETAILED DESCRIPTION

[0047] In order to make the objectives, technical solutions and advantages of the present disclosure more clearly understood, the present disclosure is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0048] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in one or more embodiments of this specification should have the usual meanings understood by people with ordinary skills in the field to which this disclosure belongs. The "first", "second" and similar words used in one or more embodiments of this specification do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative position relationships. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0049] In recent years, driving safety issues such as drunk driving have garnered widespread attention. Currently, civilian vehicles require a cabin odor sensor to identify drivers who are under the influence of alcohol before they enter the vehicle. Electronic noses are one type of in-vehicle drunk driving detection system that is easy to install and can accurately and quickly detect drunk driving. However, due to low temperatures or even extreme cold weather in some parts of the world during winter, the resistance of the metal oxide semiconductor sensor, the core component of the electronic nose, increases, resulting in signal drift, leading to misclassification and inaccurate measurement results. Therefore, maintaining a constant and suitable temperature environment for the electronic nose is crucial in extremely cold environments. Existing methods incorporate temperature control modules into gas sensor circuits, but this approach results in uneven heating of the circuit, excessive device size, and unstable temperature control. Algorithmic temperature compensation is widely used for sensor temperature compensation due to its cost-effectiveness and high accuracy. However, the temperature compensation range is limited, and algorithmic temperature compensation cannot meet the operating requirements of electronic nose detection systems in extremely cold environments.

[0050] The purpose of the present invention is to address the shortcomings of the existing technology and provide a vehicle-mounted electronic nose constant temperature device. By using a special bionic pre-heating component, the cold air before entering the electronic nose system is fully heated. Combined with the constant temperature cavity, a good air temperature environment can be maintained in the electronic nose cavity, thereby improving the precision and accuracy of the electronic nose drunk driving detection, reducing the size of the device and reducing costs.

[0051] Reference Figure 1 , the present application provides a vehicle-mounted electronic nose constant temperature device, the vehicle-mounted electronic nose constant temperature device comprises: a preheating component A and a constant temperature chamber;

[0052] The preheating air outlet 1 of the preheating assembly A is connected to the constant temperature chamber air inlet 10 of the constant temperature chamber; wherein,

[0053] The preheating component A is used to preheat the inflowing gas;

[0054] The constant temperature chamber is used to control the temperature of the gas preheated by the preheating component so that the temperature of the gas entering the constant temperature chamber is within a preset range.

[0055] When using the in-vehicle electronic nose thermostat, the sensor assembly is installed inside the thermostat chamber. Driven by an external air pump, the gas to be detected passes through the preheating assembly A, the thermostat chamber, and then exits the in-vehicle electronic nose thermostat. The gas to be detected is preheated in the preheating assembly A and then passed through the thermostat chamber for detection by the sensor.

[0056] The vehicle-mounted electronic nose constant temperature device of the present application uses a special bionic preheating component to fully heat the cold gas before entering the electronic nose system, and combined with the constant temperature cavity, it can maintain a good gas temperature environment in the electronic nose cavity.

[0057] Reference Figure 1-Figure 5 In one embodiment, the preheating assembly A comprises: a preheating channel and at least one first heating element a5;

[0058] The preheating channel comprises at least one preheating chamber a1, a preheating air inlet 2 and a preheating air outlet 1;

[0059] The preheating air inlet 2 is provided on one side of the preheating chamber a1 and is connected to the interior of the preheating chamber a1;

[0060] The preheating air outlet 1 is provided at the other side of the preheating chamber a1 and is connected to the interior of the preheating chamber a1;

[0061] The first heating element a5 is disposed outside the side wall of the preheating chamber a1.

[0062] In this embodiment, the gas passes through the preheating air inlet 2, the preheating chamber a1 and the preheating air outlet 1 in sequence, wherein the gas is heated in the preheating chamber a1; by arranging the first heating element a5 outside the preheating chamber a1, the temperature in the preheating chamber a1 is ensured to be uniform, thereby avoiding the uneven temperature caused by direct contact with the heating element.

[0063] Reference Figure 1-Figure 5 The preheating chamber a1 has a width L1 of 8-10mm, a length L2 of 44-46mm, and a thickness L4 of 100-105mm. The first heating element a5 can be an electric heating plate with a length L4 of 100-105mm and a thickness of 2mm. The preheating air inlet 2 and the preheating air outlet 1 have a length L5 of 20-24mm and an inner diameter D1 of 16-20mm.

[0064] Reference Figure 1-Figure 5 In one embodiment, the preheating channel further comprises: a wing plate 8 disposed inside the preheating chamber a1;

[0065] A first slot is provided on the outside of the side wall of one side of the wing plate 8, and a first heating element a5 is plugged into the first slot;

[0066] A second slot is provided on the outside of the side wall on the other side of the wing plate 8, and a first heating element a5 is plugged into the second slot.

[0067] In this embodiment, the interior of the preheating chamber a1 is divided into two parts by setting a wing plate 8, and heated separately by two first heating elements a5. In this way, each first heating element a5 is responsible for heating a smaller part of the space, which is more conducive to uniform temperature in the heating chamber.

[0068] The first clamping slot includes a first limiting portion 4 and a second limiting portion 6, and the first limiting portion 4 and the second limiting portion 6 cooperate to fix the first heating element a5;

[0069] The second clamping slot includes a third limiting portion 3 and a fourth limiting portion 5 , and the first heating element a5 is fixed based on the cooperation between the third limiting portion 3 and the fourth limiting portion 5 .

[0070] Specifically, the length L3 of the wing plate 8 is 30-35 mm.

[0071] In one embodiment, the number of the preheating chambers a1 is three.

[0072] In this embodiment, the preheating efficiency is effectively improved by providing three preheating chambers a1.

[0073] The preheating component A provided in the present application is designed to simulate the nasal structure of a polar bear. The polar bear's nasal cavity has a large specific surface area nasal structure with branched diffusion channels, which can preheat the inhaled gas.

[0074] Reference Figure 6 In one embodiment, the constant temperature chamber comprises: an outer shell, a heat-insulating layer F, a second heating element E and an inner shell D;

[0075] The thermal insulation layer F is sheathed inside the outer shell;

[0076] The inner shell D is arranged inside the insulation layer F;

[0077] The second heating element E is arranged in the gap between the thermal insulation layer F and the inner shell D.

[0078] In this application, the preheated gas in the constant temperature chamber is insulated by the insulation layer F; the second heating element E performs secondary heating on the gas in the constant temperature chamber, and cooperates with the preheating component A to achieve a uniform increase in the gas temperature.

[0079] Wherein, the second heating element E is made of carbon nanotube material.

[0080] Reference Figure 1 and Figure 6 In one embodiment, the housing includes a housing body C and a side cover B;

[0081] The side cover B is provided on one side of the housing body C;

[0082] The constant temperature chamber air inlet 10 is provided on the side cover B.

[0083] In this embodiment, the side cover B is detachably arranged on one side of the outer shell body C, so as to facilitate the installation of the heat-insulating layer F, the second heating element E and the inner shell D into the interior of the outer shell body C.

[0084] Reference Figure 7 The outer diameter D3 of the side cover B is 203-205mm, a fixing part is provided on one side of the side cover B, the diameter D5 of the fixing part is 200-202mm, the total thickness L6 of the side cover B is 5-8mm, and a constant temperature chamber air inlet 10 is provided in the center, with a diameter D4 of 4-5mm.

[0085] The fixing portion is used to connect the outer shell body C and cooperate with the outer shell body C to clamp the thermal insulation layer F, the second heating element E, and the inner shell D.

[0086] Reference Figure 8 The shell C is a cylindrical cup-shaped structure with an outer diameter L8 of 203-205mm, a length L7 of 295-300mm, and a wall thickness of 4-5mm. A first circular hole 11 is provided at the bottom of the shell C, and the first circular hole 11 is used for the sensor cable to pass through; a second circular hole 12 is provided at the center of the bottom of the shell C, and the diameter D6 of the second circular hole 12 is 10-12mm for internal gas to flow out.

[0087] Reference Figure 9 In one embodiment, the inner shell D is a cylindrical structure, and a plurality of through holes d1 are provided on the side wall.

[0088] The outer diameter D7 of the inner shell D is 200-202 mm, the length L9 is 294-298 mm, the wall thickness is 1-2 mm, and the through holes d1 are evenly arranged in a pattern of 100×50 with a diameter of 4-5 mm. The provision of the through holes d1 is conducive to heat transfer.

[0089] In one embodiment, the thermal insulation layer F is woven from hollow fibers.

[0090] Reference Figure 10 The insulation layer F is cup-shaped, with an outer diameter D8 of 202-204 mm, a wall thickness of 1-2 mm, a length L10 of 294-298 mm, and a third circular hole 13 with a diameter D9 of 10-12 mm at the bottom center. The third circular hole 13 is used for internal gas to flow out.

[0091] In this embodiment, the fibers used to weave the thermal insulation layer F are made by freeze-spinning a silk fibroin solution into intelligent bionic fibers with a porous microstructure. The fibers with a porous hollow structure can effectively lock in still air and reduce heat loss.

[0092] In one embodiment, the centers of the constant temperature chamber air inlet 10, the second circular hole 12 and the third circular hole 13 are coaxial.

[0093] On the other hand, the present application also provides a vehicle-mounted drunk driving detection electronic nose, which includes a controller, a sensor, and the above-mentioned vehicle-mounted electronic nose constant temperature device;

[0094] The sensor is installed inside the inner shell D of the vehicle-mounted electronic nose thermostat and is used to detect the alcohol content of the gas and generate an electronic signal;

[0095] The controller is used to obtain the electronic signal generated by the sensor and calculate the alcohol detection result based on the electronic signal.

[0096] The workflow of the present invention is as follows:

[0097] The in-vehicle drunk driving detection electronic nose provided by the present invention is installed behind the steering wheel of the driver's seat in the vehicle cabin, so that the invention is directly in front of the driver's head and neck. The in-vehicle electronic nose is continuously powered so that the second heating element E continuously heats and insulates the electronic nose system. When the driver enters the cabin, detection work is performed. The front air pump provides intake conditions for the device to perform intake air sampling at a rate of 500 mL / min. The cabin air containing the driver's exhaled breath enters the inner cavity of the inner shell D of the in-vehicle drunk driving detection and contacts the gas sensor. The controller calculates the alcohol content based on the signal generated by the sensor. When the driver drinks, the controller generates a response to identify the driver as drunk driving, thereby realizing detection and identification of drunk driving. The sensor is in an ideal inner cavity temperature environment of 25°C throughout the entire process.

[0098] Figure 11 A more specific controller structure diagram provided by this embodiment is shown. The device may include: a processor 1010, a memory 1020, an input / output interface 1030, a communication interface 1040, and a bus 1050. The processor 1010, the memory 1020, the input / output interface 1030, and the communication interface 1040 are communicatively connected to each other within the device via the bus 1050.

[0099] The processor 1010 can be implemented by a general-purpose CPU (Central Processing Unit), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits to execute related programs.

[0100] The memory 1020 can be implemented in the form of ROM (Read Only Memory), RAM (Random Access Memory), static storage devices, dynamic storage devices, etc. The memory 1020 can store an operating system and other application programs. When the technical solutions provided in the embodiments of this specification are implemented through software or firmware, the relevant program code is stored in the memory 1020 and is called and executed by the processor 1010.

[0101] The input / output interface 1030 is used to connect input / output modules to implement information input and output. The input / output modules can be configured as components within the device (not shown in the figure) or can be externally connected to the device to provide corresponding functions. Input devices may include a keyboard, mouse, touch screen, microphone, various sensors, etc., and output devices may include a display, speaker, vibrator, indicator light, etc.

[0102] The communication interface 1040 is used to connect to a communication module (not shown) to enable communication between the device and other devices. The communication module can communicate via a wired method (such as USB, network cable, etc.) or a wireless method (such as mobile network, WiFi, Bluetooth, etc.).

[0103] The bus 1050 comprises a path for transmitting information between the various components of the device (eg, the processor 1010 , the memory 1020 , the input / output interface 1030 , and the communication interface 1040 ).

[0104] It should be noted that although the above device only shows the processor 1010, the memory 1020, the input / output interface 1030, the communication interface 1040, and the bus 1050, in a specific implementation, the device may also include other components necessary for normal operation. In addition, it will be understood by those skilled in the art that the above device may only include the components necessary to implement the embodiments of this specification, and does not necessarily include all the components shown in the figure.

[0105] On the other hand, the present application also provides a car, which includes the above-mentioned on-board drunk driving detection electronic nose.

[0106] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present disclosure (including the claims) is limited to these examples. Based on the concept of the present disclosure, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of different aspects of one or more embodiments of the present specification as described above, which are not provided in detail for the sake of simplicity.

[0107] In addition, to simplify the description and discussion, and so as not to obscure one or more embodiments of the present specification, well-known power / ground connections to integrated circuit (IC) chips and other components may or may not be shown in the provided figures. In addition, devices may be shown in block diagram form to avoid obscuring one or more embodiments of the present specification, and this also takes into account the fact that the details of the implementation of these block diagram devices are highly dependent on the platform on which one or more embodiments of the present specification will be implemented (i.e., these details should be fully within the purview of those skilled in the art). Where specific details (e.g., circuits) are set forth to describe exemplary embodiments of the present disclosure, it will be apparent to those skilled in the art that one or more embodiments of the present specification may be implemented without these specific details or with variations in these specific details. Accordingly, these descriptions should be considered illustrative rather than restrictive.

[0108] Although the present disclosure has been described in conjunction with specific embodiments thereof, many alternatives, modifications, and variations of these embodiments will be apparent to those skilled in the art based on the foregoing description. For example, other memory architectures (e.g., dynamic RAM (DRAM)) may use the embodiments discussed.

[0109] The one or more embodiments of this specification are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of one or more embodiments of this specification shall be included within the scope of protection of this disclosure.

Claims

1. A vehicle-mounted electronic nose constant temperature device, characterized in that: The vehicle-mounted electronic nose constant temperature device includes: a preheating component and a constant temperature chamber; The preheating air outlet of the preheating assembly is connected to the constant temperature chamber air inlet of the constant temperature chamber; wherein, The preheating component is used to preheat the inflowing gas; The constant temperature chamber is used to control the temperature of the gas preheated by the preheating assembly so that the temperature of the gas entering the constant temperature chamber is within a preset range; the preheating assembly includes: a preheating channel and at least one first heating element; The preheating channel includes at least one preheating chamber, a preheating air inlet and a preheating air outlet; The preheating air inlet is provided on one side of the preheating chamber and is communicated with the interior of the preheating chamber; The preheating air outlet is provided at the other side of the preheating chamber and is communicated with the interior of the preheating chamber; The preheating chamber is arranged outside the constant temperature chamber, and the preheating chamber is connected to the constant temperature chamber through a preheating air outlet; two first heating elements are provided, which are respectively arranged outside the side walls of the preheating chamber; the gas passes through the preheating air inlet, the preheating chamber and the preheating air outlet in sequence and is heated in the preheating chamber; by arranging the first heating element outside the preheating chamber, the temperature inside the preheating chamber is made uniform; The preheating channel further includes: a wing plate disposed inside the preheating chamber; The interior of the preheating chamber is divided into two parts by providing a wing plate, and two first heating elements are used to heat parts of the interior of the preheating chamber respectively, so that the temperature in the preheating chamber is uniform; the constant temperature chamber includes: an outer shell, an insulation layer, a second heating element and an inner shell; The second heating element is arranged in the gap between the thermal insulation layer and the inner shell; the thermal insulation layer is woven from hollow fibers; wherein, the fibers used to weave the thermal insulation layer are made by freeze-spinning technology, and the silk fibroin solution is made into intelligent bionic fibers with a porous microstructure, so that the fibers with a porous hollow structure can lock still air.

2. The vehicle-mounted electronic nose thermostat according to claim 1, wherein: A first slot is provided on the outside of the side wall of one side of the wing plate, and the first heating element is plugged into the first slot; A second slot is provided on the outside of the side wall on the other side of the wing plate, and one of the first heating elements is plugged into the second slot.

3. The vehicle-mounted electronic nose thermostat according to claim 2, wherein: The number of the preheating chambers is three.

4. The vehicle-mounted electronic nose thermostat according to claim 3, wherein: The thermal insulation layer is sleeved inside the shell; The inner shell is arranged inside the thermal insulation layer.

5. The vehicle-mounted electronic nose thermostat according to claim 4, characterized in that: The housing comprises a housing body and a side cover; The side cover is arranged on one side of the housing body; The air inlet of the constant temperature chamber is provided on the side cover; A fixing portion is provided on one side of the side cover; The fixing part is used to connect the outer shell body and cooperate with the outer shell body to clamp the thermal insulation layer, the second heating element and the inner shell.

6. The vehicle-mounted electronic nose thermostat according to claim 5, characterized in that: The inner shell is a cylindrical structure, and a plurality of through holes are provided on the side wall.

7. A vehicle-mounted electronic nose for drunk driving detection, characterized in that: The vehicle-mounted drunk driving detection electronic nose comprises a controller, a sensor and the vehicle-mounted electronic nose constant temperature device according to any one of claims 1 to 6; The sensor is arranged inside the inner shell of the vehicle-mounted electronic nose thermostat and is used to detect the alcohol content of the gas and generate an electronic signal; The controller is used to obtain the electronic signal generated by the sensor and calculate the alcohol detection result according to the electronic signal.

8. An automobile, characterized in that: The car includes the vehicle-mounted drunk driving detection electronic nose as claimed in claim 7.

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