CN104925002A - System and method for monitoring air environment in vehicle based on sensors - Google Patents

Abstract

The invention relates to a multi-sensor based air environment monitoring system and method in a vehicle. The system includes a vehicle-mounted central controller, a detection and sensing device, an actuator and a UPS. The vehicle-mounted central controller is arranged inside the vehicle body, and respectively It is connected with the detection induction device and the actuator, and the UPS is respectively connected with the vehicle-mounted central controller, the detection induction device and the actuator, and the detection induction device includes the detection induction assembly inside the vehicle and the detection induction assembly outside the vehicle. Both the in-vehicle detection and sensing component and the external detection and sensing component include a carbon monoxide detector, a carbon dioxide detector and a VOC detector respectively connected to the vehicle-mounted controller. Compared with the prior art, the present invention has the advantages of the first comparison mechanism, safety and reliability, intelligent interactive mode, and humanization.

Description

A multi-sensor based air environment monitoring system and method in a vehicle

technical field

The invention relates to the field of safety and environmental science, in particular to a multi-sensor based air environment monitoring system and method in a vehicle.

Background technique

In recent years, my country's auto market has continued to develop, but the air quality inside the car is worrying. According to the survey data conducted in different regions for many times, the proportion of vehicles with excessive air pollutants in the vehicle exceeds 80%. Since drivers and passengers are directly and long-term in contact with the air in the car, its pollution will cause direct harm to the health and safety of personnel. The types of pollutants in the car mainly include volatile organic compounds (VOC), carbon monoxide, carbon dioxide, and inhalable particulate matter. Among them, VOC has attracted widespread attention due to its carcinogenicity, and a large number of related studies have been done. However, because carbon monoxide and carbon dioxide are relatively low in harm, there are few related studies. However, its impact cannot be ignored. Higher concentration of carbon monoxide can cause dizziness and even suffocation; long-term exposure to 3% carbon dioxide can cause fatigue, pain, and paresthesia. Dizziness, difficulty breathing, and even death. Because carbon monoxide and carbon dioxide are colorless, odorless, and have no obvious adverse reactions, the concentration in the car is often in a state of exceeding the standard, but the people in the car do not know it. Therefore, it is necessary to carry out monitoring and early warning.

At present, the devices used to improve the gas environment in the car are roughly divided into four types.

The first is to perform detection only. This type of device has a built-in VOC sensor, connects to the mobile phone through Bluetooth, and is equipped with an official app to provide car owners with real-time detection information of the air quality in the car. It is characterized by small size and powerful functions; it can provide alarms for excessive pollution, carbon monoxide poisoning, early warning of spontaneous combustion in the car, suggestions for improving the environment in the car, and even track the life cycle of the car. But it also has some disadvantages. For example, due to its small size and no battery, it needs to rely on the USB port in the car for power supply; it can only send an alarm message to the car owner, and the subsequent operations such as improving ventilation need to be completed by the car owner.

The second is to continuously purify the interior of the car without detection. For example, car oxygen bar products mainly eliminate air odor and sterilize by generating and releasing ozone and negative oxygen ions. Due to the limited output power of this product, it does not completely filter the air circulation, and the purification effect is not obvious; in addition, it has a single function, only has a bactericidal effect, and cannot monitor carbon monoxide, carbon dioxide and other gases.

The third is to detect the air quality and purify it in the car. This type of product can display the air quality information in the car with the LED lights on the front end, and realize the purification of the dirty air in the car through plasma generation, negative ion generation, photocatalyst or multiple filter technology. It is characterized by good purification effect, which can effectively remove organic chemical gases such as formaldehyde and toluene, and can also adsorb germs and PM2.5 particles. But the disadvantage is the lack of monitoring of the concentration of carbon monoxide and carbon dioxide; and the price is relatively high, usually more than 1,000 yuan.

The fourth is to detect air quality and improve it through ventilation. For example, a car carbon dioxide detection control module is installed inside the passenger car. During the driving process of the vehicle, the module monitors the air quality in the car in real time. When the carbon dioxide concentration in the car is found to exceed the set threshold, the module can Automatically turn on the car's air supply system to provide fresh air to the car; when the carbon dioxide concentration in the car reaches the set safe value, the module can automatically turn off the air supply system. The application object of this module is passenger car. For cars, one of Taiwan's research results is to monitor the concentration of a specific gas in the car, and when the concentration is greater than a specific warning value, it will automatically open the window or send a distress signal and positioning signal to the outside. These products all can realize automatic control to the air-conditioning of automobile or car window, have provided convenience for the driver, but lack the solicitation to driver's opinion. For example, turning on the external circulation of the air conditioner will increase the fuel consumption of the car, and opening the car window may cause infringement on personal privacy and property. Considering these factors, sometimes although the air environment in the car has deteriorated, the driver hopes to endure it for a short period of time. Above-mentioned equipment just can't satisfy such demand. In addition, this kind of equipment can only play a role when the car is started, and cannot work after the flame is turned off. In fact, due to sleeping in the car after turning off the engine, the concentration of carbon dioxide in the car continues to rise, causing people to suffer from hypoxia and death from time to time. In order to avoid the occurrence of this situation, it is necessary to continuously monitor the gas environment in the car after the car is turned off, and send a reminder or warning in time to allow the people in the car to pay attention to ventilation or leave the car.

The previous research results mainly focused on the treatment of VOC, and seldom involved carbon monoxide and carbon dioxide. The interaction mode of the product has defects, and there is a lack of monitoring of the harmful gas content in the vehicle after the vehicle is turned off, which has great potential safety hazards.

The Chinese patent with the publication number CN103344743A discloses a vehicle interior air detection device, which includes a trigger circuit, a carbon dioxide sensor, a nitrogen oxide sensor, a first comparator, a second comparator, or an arithmetic chip, and a relay actuator. Real-time detection of the concentration of carbon dioxide and nitrogen oxides in the air, open the window for ventilation when the concentration exceeds the standard, and keep the air in the car fresh while testing the air quality. However, the device described in this patent cannot detect the concentration of carbon monoxide, nor can it continue to monitor after the car is turned off, so the safety risk is high.

Publication number is that the Chinese patent of CN103389359A discloses a kind of air detection device for automobile, and this device comprises power module, air detector, CPU information processing module, output module and alarm; Described air detector and CPU information processing module are respectively connected a power supply module; the air detector is connected to the CPU information processing module; the output module and the alarm are respectively connected to the CPU information processing module. However, this patent cannot detect all pollutants in the car, and it cannot automatically detect whether there are people in the car, and it cannot work normally after the engine is turned off. The purification effect is poor and the risk factor is high.

The Chinese patent with publication number CN202720217U discloses an air detection device for automobiles. circuit and expansion circuit; the temperature and humidity sensor, carbon oxide sensor, nitrogen oxide sensor, freon sensor and dust sensor are respectively connected to the single-chip microcomputer through the data acquisition circuit, and the single-chip microcomputer is respectively connected to the alarm circuit and the expansion circuit; the power supply circuit provides power. But this device can only send an alarm to remind the people in the car when the concentration of pollutants in the car exceeds the standard, and can not take action to reduce the concentration of pollutants in the car, the degree of automation is low and the operation is inconvenient.

Contents of the invention

The purpose of the present invention is to provide a multi-sensor-based air environment monitoring system and method in a car with an original comparison mechanism, safe and reliable, intelligent and humanized interactive mode in order to overcome the above-mentioned defects in the prior art.

The purpose of the present invention can be achieved through the following technical solutions:

A multi-sensor-based air environment monitoring system in a car, comprising a vehicle-mounted central controller, a detection sensing device, an actuator and a UPS, the vehicle-mounted central controller is arranged inside the vehicle body, and is connected with the detection sensing device and the actuator respectively connected, the UPS is respectively connected with the vehicle-mounted central controller, the detection sensing device and the actuator, the detection sensing device includes a vehicle detection sensing component and an external detection sensing component, and the vehicle detection sensing component and the vehicle The external detection and sensing components all include a carbon monoxide detector, a carbon dioxide detector and a VOC detector respectively connected to the vehicle-mounted controller.

The carbon monoxide detector is an MQ-9 sensor, the carbon dioxide detector is a mg811 carbon dioxide sensor, and the carbon monoxide detector and carbon dioxide detector are respectively arranged in the car and at the air intake grille.

The vehicle-mounted central controller includes a single-chip microcomputer, a voice alarm and a liquid crystal display, and the single-chip microcomputer is respectively connected with the voice alarm, the liquid crystal display, a detection sensing device and an actuator.

The actuator includes a window switch and a vehicle air conditioner switch.

The detection and induction device also includes a seat pressure sensor connected with the single-chip microcomputer.

A method for monitoring the air environment in a car based on multiple sensors, comprising the following steps:

1) Obtain the pressure information on the seat through the seat pressure sensor and judge whether there is anyone in the car, if so, proceed to step 2), if not, return to step 1);

2) Detect the concentration of carbon monoxide, carbon dioxide and VOC in the car through the detection sensor device, and judge whether the concentration exceeds the warning value, if so, then voice alarm, and proceed to step 3), if not, then return to step 2);

3) Detect the concentration of carbon monoxide, carbon dioxide and VOC outside the car through the detection sensor device, and compare it with the concentration inside the car. If the concentration inside the car is greater than the concentration outside the car, control the window to open. If the concentration outside the car is greater than the concentration inside the car, Then control the window to close, control the vehicle air conditioner to open, enter the internal circulation mode, and return to step 2).

The warning value in the described step 2) is divided into three levels of warning. When the concentration in the car reaches the third level of warning, an alarm is performed every 30s, and the windows and air conditioner are forced to be opened for processing.

Compared with the prior art, the present invention has the following advantages:

1. The first comprehensive comparison operation mechanism of the air quality inside and outside the vehicle: the existing technology either only detects the air quality outside the vehicle to prevent excessively high concentrations of pollutants from entering the vehicle, or only detects the air quality inside the vehicle, and takes measures when the pollution is serious. It is obviously unreasonable to detect the air quality outside the car while ignoring the air quality inside the car; if only the air quality inside the car is detected, the air pollution outside the car may be more serious than that inside the car, but it reminds to strengthen ventilation, which will further aggravate the pollution inside the car. The present invention is based on The air quality data outside the car and inside the car collected by the detectors installed in the air intake grille and inside the car are compared and analyzed comprehensively. Only when the air quality outside the car is better than that inside the car, the method of strengthening ventilation is used to purify The air quality inside the car ensures the effectiveness of the ventilation measures.

2. The full-time detection technology is used, which is safer and more reliable: the existing technology ends the detection of the air quality in the car after the engine is turned off, and there are serious safety risks. Some drivers or passengers stay in the car after the vehicle is turned off. It is closed and narrow, and it is very prone to major safety accidents caused by hypoxia, and such reports are not uncommon every year. The present invention relies on the uninterrupted power supply provided by the UPS to continuously monitor the air inside the vehicle after the vehicle is turned off, and take timely measures in case of danger, so as to provide a surefire safety guarantee for the user's life.

3. The interactive mode is intelligent and humanized. This patent adopts voice prompts to allow drivers to understand the air quality in the car without moving their eyes and reduce the distraction of the user's attention. The multi-level early warning interaction mode adopted in this patent not only has a high degree of automation, but also respects the user's right to choose. When the concentration of pollutants reaches the warning value of each level, a voice prompt will be issued first to report the pollution degree and explain the measures to be taken automatically to protect the user's right to know. After the voice broadcast, there will be 10 seconds for the user to choose whether to accept the upcoming measures If the user refuses to take measures due to certain considerations, he can choose to cancel, which guarantees the user's right to choose. If the user agrees with the measures recommended by the system, no operation is required, as long as the countdown is over, the system will automatically control the air conditioner and windows to enhance ventilation, with a high level of automation. Since the system runs continuously all the time, there will be no situation where the user forgets to turn it on. This system makes the user worry-free, comfortable and at ease.

Description of drawings

Fig. 1 is the system work flowchart in the embodiment.

Fig. 2 is a schematic diagram of the system structure of the present invention.

Among them, 1. Vehicle central controller, 2. Detection and sensing device, 3. Actuator, 4. UPS, 11. Single-chip microcomputer, 12. Voice alarm, 13. Liquid crystal display, 21. Carbon monoxide detector, 22. Carbon dioxide detector , 23, VOC detector.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

Example:

As shown in Figure 2, the figure is a schematic diagram of the system structure of the present invention, a multi-sensor based air environment monitoring system in the vehicle, including a vehicle-mounted central controller 1, a detection and sensing device 2, an actuator 3 and a UPS4, and a vehicle-mounted central controller 1 is set inside the car body and is connected to the detection sensing device 2 and the actuator 3 respectively, and the UPS4 is respectively connected to the vehicle-mounted central controller 1, the detection sensing device 2 and the actuator 3, and the detection sensing device 2 includes the detection sensing component and the The detection and induction components outside the vehicle, the detection and induction components inside the vehicle and the detection and induction components outside the vehicle all include a carbon monoxide detector 21 , a carbon dioxide detector 22 and a VOC detector 23 respectively connected to the vehicle-mounted controller 1 .

The carbon monoxide detector 21 is an MQ-9 sensor, the carbon dioxide detector 22 is a mg811 type carbon dioxide sensor, and the carbon monoxide detector 21 and the carbon dioxide detector 22 are respectively arranged in the car and at the air intake grille.

The vehicle-mounted central controller 1 includes a single-chip microcomputer 11, a voice alarm 12 and a liquid crystal display 13, and the single-chip microcomputer 11 is connected with the voice alarm 12, the liquid crystal display 13, the detection sensing device 2 and the actuator 3 respectively, and the actuator 3 includes a window switch and a vehicle-mounted The air-conditioning switch, the detecting and sensing device 2 also includes a seat pressure sensor connected with the single-chip microcomputer 11 .

The purpose of the present invention is to design a set of humanized, safe and reliable car air environment monitoring and early warning safety system by optimizing the existing products, so as to ensure the health and life safety of the people in the car.

The present invention optimizes on the basis of original in-vehicle air monitoring and purification equipment, and its specific contents include:

With GL7-877A single-chip microcomputer as the system carrier, mg811 carbon dioxide sensor is used to detect carbon dioxide, MQ-9 sensor is used to detect carbon monoxide, WT588D voice module can issue voice prompts, seat sensor monitors whether there are people in the car, and the power management system supplies power to all equipment .

The workflow of the system is shown in Figure 1.

The single-chip microcomputer can rewrite the program, which is easy to upgrade.

In the past, the product only checked the air quality of one of the inside and outside of the vehicle, but this system adopts a comprehensive monitoring plan for the inside and outside of the vehicle. Considering that enhanced ventilation can improve the air quality inside the vehicle only when the air quality outside the vehicle is good. When the air pollution outside the car is serious, close the windows and turn on the internal circulation mode of the air conditioner to prevent pollutants from entering.

The present invention uses a liquid crystal display to display the air quality in the vehicle, but since the driver should not be distracted while driving the vehicle, the voice module will issue a voice prompt when the air quality deteriorates to inform the driver of the measures that the system is about to take, and the driver does not need to do anything The operation can be automatically completed by the system after the countdown ends.

The power management system is a major feature of this system. The built-in independent power supply allows the device to work after the car is turned off, eliminating the potential suffocation hazards that may occur if people stay in the car after the car is turned off. When the car is started, it can charge the power supply, so that the system can run continuously to protect people's health and safety.

Compared with existing products, the present invention has higher reliability and more humanized interaction. At present, the writing work of the system has been completed, and the experiment has been carried out by connecting carbon monoxide and carbon dioxide sensors. However, the human body detection and the control of the air-conditioning window are only simulated, and further cooperation and improvement are needed for practical application.

In the present invention, a carbon monoxide sensor and a carbon dioxide sensor are respectively installed in the car and at the air intake grille, and are connected with the single-chip microcomputer. Connect the seat sensor to provide a signal of whether there is a person in the car. Plug the power cord into the car cigarette lighter to charge the system power when the car is started. After the system is installed, it can detect the concentration of carbon monoxide and carbon dioxide inside and outside the car. If there are people in the car, when the concentration exceeds the standard, a voice prompt will be issued and the ventilation will be enhanced through the control of the air conditioner and car windows, so as to optimize the air quality in the car and protect the safety of people. health and safety purposes.

Claims (7)

1. one kind based on air environment monitoring system in the car of multisensor, it is characterized in that, comprise vehicle-mounted central controller (1), detect induction installation (2), actr (3) and UPS (4), described vehicle-mounted central controller (1) is arranged on vehicle body, and be connected with detection induction installation (2) and actr (3) respectively, described UPS (4) respectively with vehicle-mounted central controller (1), detect induction installation (2) to be connected with actr (3), described detection induction installation (2) comprises detection inductive component and car in car and detects inductive component outward, in described car, detection inductive component detects inductive component outward with car and includes the carbon monoxide detector (21) be connected with vehicle-mounted central controller (1) respectively, carbon dioxide indicator (22) and VOC detector (23).

2. according to claim 1 a kind of based on air environment monitoring system in the car of multisensor, it is characterized in that, described carbon monoxide detector (21) is MQ-9 sensor, described carbon dioxide indicator (22) is mg811 type carbon dioxide sensor, and described carbon monoxide detector (21) and carbon dioxide indicator (22) are separately positioned on Che Nei and air-inlet grille place.

3. according to claim 1 a kind of based on air environment monitoring system in the car of multisensor, it is characterized in that, described vehicle-mounted central controller (1) comprises micro controller system (11), phonetic alarm (12) and Liquid Crystal Display (13), described micro controller system (11) respectively with phonetic alarm (12), Liquid Crystal Display (13), detect induction installation (2) and actr (3) is connected.

4. according to claim 1ly a kind ofly to it is characterized in that based on air environment monitoring system in the car of multisensor, described actr (3) comprises car window switch and on-board air conditioner switch.

5. according to claim 3ly a kind ofly to it is characterized in that based on air environment monitoring system in the car of multisensor, described detection induction installation (2) also comprises the image sensor be connected with micro controller system (11).

6. adopt the monitoring method based on air environment monitoring system in the car of multisensor as described in any one of claim 1-5, it is characterized in that, comprise the following steps:

1) obtain the pressure information on seat by image sensor and judge whether have people in car, if so, then carry out step 2), if not, then return step 1);

2) by detecting the concentration of carbonic oxide, carbon dioxide and VOC in induction installation inspection vehicle, and judge whether this concentration exceedes warning value, if so, then audio alert, and carry out step 3), if not, then return step 2);

3) by detecting the concentration of carbonic oxide, carbon dioxide and VOC outside induction installation inspection vehicle, and compare with the concentration in car, Ruo Chenei concentration is greater than car extracellular concentration, then control vehicle window to open, if car extracellular concentration is greater than concentration in car, then controls vehicle window and close, control on-board air conditioner and open, enter Inner eycle pattern, and return step 2).

7. according to claim 1 a kind of based on air environment monitoring method in the car of multisensor, it is characterized in that, described step 2) in warning value be divided into three grades of warnings, when concentration in car reaches three grades of warnings, then once report to the police every 30s, and positive opening vehicle window and air-conditioning process.