CN110027385A - Automobile intelligent antifog system based on STM32 single-chip microcontroller - Google Patents

Automobile intelligent antifog system based on STM32 single-chip microcontroller Download PDF

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Publication number
CN110027385A
CN110027385A CN201910328397.XA CN201910328397A CN110027385A CN 110027385 A CN110027385 A CN 110027385A CN 201910328397 A CN201910328397 A CN 201910328397A CN 110027385 A CN110027385 A CN 110027385A
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CN
China
Prior art keywords
temperature
module
stm32
humidity
microcontroller
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201910328397.XA
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Chinese (zh)
Inventor
李艺非
范开国
王若达
沈荣桂
马跃
苏守先
陈明晞
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University of Shanghai for Science and Technology
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University of Shanghai for Science and Technology
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by University of Shanghai for Science and Technology filed Critical University of Shanghai for Science and Technology
Priority to CN201910328397.XA priority Critical patent/CN110027385A/en
Publication of CN110027385A publication Critical patent/CN110027385A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60HARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00Heating, cooling or ventilating [HVAC] devices
    • B60H1/00642Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
    • B60H1/00735Control systems or circuits characterised by their input, i.e. by the detection, measurement or calculation of particular conditions, e.g. signal treatment, dynamic models
    • B60H1/00785Control systems or circuits characterised by their input, i.e. by the detection, measurement or calculation of particular conditions, e.g. signal treatment, dynamic models by the detection of humidity or frost
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60HARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00Heating, cooling or ventilating [HVAC] devices
    • B60H1/00642Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
    • B60H1/00735Control systems or circuits characterised by their input, i.e. by the detection, measurement or calculation of particular conditions, e.g. signal treatment, dynamic models
    • B60H1/00807Control systems or circuits characterised by their input, i.e. by the detection, measurement or calculation of particular conditions, e.g. signal treatment, dynamic models the input being a specific way of measuring or calculating an air or coolant temperature
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60JWINDOWS, WINDSCREENS, NON-FIXED ROOFS, DOORS, OR SIMILAR DEVICES FOR VEHICLES; REMOVABLE EXTERNAL PROTECTIVE COVERINGS SPECIALLY ADAPTED FOR VEHICLES
    • B60J1/00Windows; Windscreens; Accessories therefor
    • B60J1/002Windows; Windscreens; Accessories therefor with means for clear vision, e.g. anti-frost or defog panes, rain shields
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60SSERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
    • B60S1/00Cleaning of vehicles
    • B60S1/02Cleaning windscreens, windows or optical devices
    • B60S1/54Cleaning windscreens, windows or optical devices using gas, e.g. hot air
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00Ohmic-resistance heating
    • H05B3/84Heating arrangements specially adapted for transparent or reflecting areas, e.g. for demisting or de-icing windows, mirrors or vehicle windshields
    • H05B3/86Heating arrangements specially adapted for transparent or reflecting areas, e.g. for demisting or de-icing windows, mirrors or vehicle windshields the heating conductors being embedded in the transparent or reflecting material
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/80Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
    • Y02T10/88Optimized components or subsystems, e.g. lighting, actively controlled glasses

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Air-Conditioning For Vehicles (AREA)

Abstract

The present invention relates to a kind of automobile intelligent antifog systems based on STM32 single-chip microcontroller, temperature, humidity collection module acquire the temperature parameter of the temperature of same point, humidity and windshield before windshield in driver's cabin in real time, and STM32 microcontroller is passed to by signal conditioning circuit, A/D conversion circuit, on the one hand by signal output to can recognize that information is sent to showing on LCD MODULE;On the other hand by pre-set programs, real-time dew-point temperature is calculated according to indoor temperature humidity is driven;And analyzed and compared according to the temperature of real-time windshield, when windscreen temperature be lower than in a certain range dew-point temperature or it is fair when, by adjust PWM wave duty ratio come control the revolving speed of the demisting motor of HVAC demister system reach intelligence it is antifog.The present invention not only solves the problem that homogeneous system processing capacity is limited, performance is not high, and also achieves that intelligence of the automobile in complicated riving condition is antifog, substantially increases the safety and energy saving of driving.

Description

Automobile intelligent antifog system based on STM32 single-chip microcontroller
Technical field
The present invention relates to a kind of air conditioning for automobiles demister system, in particular to a kind of automobile intelligent based on STM32 single-chip microcontroller Antifog system.
Background technique
When driving vehicle driving in late autumn and season in severe winter, the problem of hazing is easy to appear on the inside of vehicle window;In the rain of summer When its trip or the tunnel by growing length, due to windshield cooling, vehicle interior temperature humidity is constant, is also easy to appear and hazes Problem.In traveling, vehicle window, which hazes, will cause the blurred vision of driver, to easily cause traffic accident, cause unnecessary Loss.Although many automobiles come with " demisting shelves " air-conditioning key and carry out demisting now, in practical drive, drive The person of sailing, because energy is concentrated, does not know when can haze in the process of moving, when discovery has fog to go out when driving vehicle When recognizing to open " demisting shelves " air-conditioning now, the interference of sight has actually been had resulted in.Needs again when demisting of turning on the aircondition at this time It bows searching, point is opened button and adjusted the speed, and when demisting also needs the time to dissipate.The whole process duration is long, in highway Upper traveling, or on the big street of vehicle flowrate flow of the people when driving, easily there is peril;And when fog dissipation, it is not required to When wanting demisting, driver possibly can not perceive interior variation in driving procedure in time, also continue transporting when not needing demisting Air-conditioning demister system of going carries out demisting, causes unnecessary waste, in the long run, it will has a large number of fuel oil and electricity can wave Take on this.Even if driver closes Defog-Switch in time, but can not also estimate defogging effect, fog quickly again can on Come, still recycles this pernicious period.So intelligent antifog system is not only the safety assurance to driver and passenger, but also Play the role of in terms of fuel-economizing economize on electricity.
For STM32 Series of MCU from the CortexM3 kernel of ARM company, which is that special design meets high property Energy, highly compatible, low-power consumption, low-work voltage and real-time, Digital Signal Processing 32 bit flash memory microcontroller products.This system STM32F103ZET6 chip is applied in design, outstanding and innovation peripheral hardware, is easy to develop maximum integrating Etc. advantages make STM32F103 series be suitable for various application occasions.
Summary of the invention
The present invention be directed to the brought problems that hazes on the inside of automotive window in driving, and propose a kind of mono- based on STM32 The automobile intelligent antifog system of piece machine not only may be implemented to prevent vehicle window from condensing under complicated weather, but also avoid as far as possible The waste of oily electricity.
The technical solution of the present invention is as follows: a kind of automobile intelligent antifog system based on STM32 single-chip microcontroller, including temperature acquisition Module, humidity collection module, STM32 microcontroller, LCD MODULE, HVAC demister system, signal conditioning circuit, A/D turn Circuit, PWM electric machine speed regulation module, clock module, communication module are changed, whole system is by automobile power source powered operation, the temperature Acquisition module and humidity collection module acquire in driver's cabin the temperature of same point before windshield, humidity and windshield in real time Temperature parameter, collected signal are passed to STM32 microcontroller by signal conditioning circuit, A/D conversion circuit, and STM32 is micro- On the one hand controller exports signal for identifiable information, send to showing on LCD MODULE;On the other hand by default Program calculates real-time dew-point temperature according to indoor temperature and humidity is driven in real time, further according to the temperature of real-time windshield Analyzed and compared, when windscreen temperature be lower than in a certain range dew-point temperature or it is fair when, pass through adjust PWM wave Duty ratio come control the speed of the demisting motor of HVAC demister system reach intelligence it is antifog.
Further, the temperature and humidity measure module arrangement is not influencing close to windshield and driver's driving sight Position, with real-time detection room temperature and windscreen temperature;The sensor of humidity detecting module and detection room temperature Same position arrangement.
Further, when temperature detecting module detects windscreen temperature arrival or more than the safety value of setting, institute It states STM32 microcontroller and the HVAC demister system is closed by clock module;When windscreen temperature drops to setting safety value The HVAC demister system is waken up when following again, and is in standby, reaches and is further continued for work when hazing condition.
Further, when outdoor temperature reaches a certain level, i.e., windshield reaches certain temperature, described when will not haze STM32 microcontroller can HVAC demister system described in temporary close.
Further, the LCD MODULE receives temperature and humidity information after processing and motor wind speed size gear Data, and it will be shown on LED display.
Further, the HVAC demister system by the window defoggers that keep out the wind after integrated heater strip and be front window and the side of a ship The hot wind air-conditioning of window demisting and comprehensive blowing mouth composition.
Further, the STM32 microcontroller, clock module, worked using full-duplex communication mode between communication module, And clock module works independently of STM32 microcontroller and communication module.
Further, the STM32 microcontroller uses the dew-point temperature for the integrated indoor temperature and humidity of characteristics algorithm that judges to haze The ratio calculation of calculating of hazing, the range and PWM value of condensing when calculating, existing dew point temperature chance windscreen temperature, receives External information parameter hazed and judge to vehicle window according to the algorithm.
Further, when carrying out judgement calculating with windscreen temperature, obtained dew-point temperature needs again the dew-point temperature In addition a safety coefficient participates in calculating of hazing again.
The beneficial effects of the present invention are: the present invention is based on the intelligent antifog systems of STM32 single-chip microcontroller, not only may be implemented The real-time display of indoor environment temperature humidity and demisting wind speed is driven, and can be according to three parameters detected and introducing A safety coefficient differentiate the danger level that hazes, help to guarantee during the system startup process when temperature and humidity suddenly rises Its reliability.And then it is antifog to control HVAC defogging mode progress intelligent speed-regulating;And in the spring and summer season of climate variability, Ke Yitong It crosses and reads real-time windscreen temperature information wake-up or close the antifog system.
After this system starts vehicle by lower button from driver, there is no need to bow when hazing find manual demisting by Button adjusts the speed demisting in turn, and solves the problems, such as to move in circles.On the one hand the set system brings convenient, raising to driver On the other hand safety realizes the effect of automobile fuel saving economize on electricity.
Detailed description of the invention
Fig. 1 is system structure functional block diagram of the invention;
Fig. 2 is antifog system overall schematic of the invention.
Specific embodiment
The invention will be further described with embodiment with reference to the accompanying drawing.
As shown in figures 1 and 2, a kind of automobile auto-antifog system based on STM32 single-chip microcontroller, by STM32 microcontroller 1, is adopted Collect part, output par, c, the composition of automotive hvac demister system 2.It is control core with STM32 microcontroller 1, collecting part includes Temperature detecting module 5, humidity detecting module 6, output par, c include LCD MODULE 4, PWM electric machine speed regulation module, clock mould Block, communication module.Temperature detecting module 5, humidity detecting module 6 connect STM32 by signal conditioning circuit, A/D conversion circuit Microcontroller signal input part, 1 signal output end of STM32 microcontroller are separately connected LCD MODULE 4, PWM electric machine speed regulation Module, clock module, communication module, PWM electric machine speed regulation module connect automotive hvac demister system 2.Interior power supply is unified for Various pieces provide electric power.Temperature detecting module 5 is tightly attached on windshield 3, the temperature of real-time detection windshield and interior Temperature;Humidity detecting module 6 is adjacently positioned with temperature detecting module 5, the humidity of real-time detection same position.
Temperature and indoor environment temperature of the temperature detecting module by temperature detection sensor detection windshield, humidity inspection Module is surveyed by the humidity of moisture detection sensor detection and temperature same point.It is relatively narrow due to driving the interior space, humidity point Cloth is uneven, and arrangement should be measured in the case where not influencing pilot's line of vision close to windshield same point as far as possible Temperature and humidity.Two temperature detection sensors and a moisture detection sensor respectively join temperature humidity three respectively detected Number is transmitted to STM32 microcontroller, and by the preset characteristics procedure that hazes carry out the calculating of indoor temperature and humidity dew-point temperature, when The ratio calculation of calculating of hazing, the range and PWM value of condensing when preceding dew-point temperature chance windscreen temperature, then will be indoor warm and humid Degree, current motor gear information are shown on LCD MODULE.
Wherein, two temperature detection sensors and a moisture detection sensor adopt external temperature and humidity information in real time When collection, collected signal is analog signal in system, and analog signal can be by collected electric signal by signal conditioning circuit It amplifies, Isolation, linearization process etc., to improve the reliability and accuracy of acquisition.Again by the electricity after conditioning Signal is transferred in STM32 microprocessor after A/D conversion circuit carries out analog-to-digital conversion.STM32 microprocessor will receive Data through calculating, be more than preset range will by communication module to HVAC demisting air-conditioning issue instruction carry out it is a series of Antifog operation.
STM32 microcontroller calculates same position temperature humidity information in current environment through preset program analysis meter Dew-point temperature, by with windscreen temperature analysis and compared with, when windscreen temperature is lower than dew point temperature in a certain range When spending or is fair, STM32 microcontroller calculates the ratio of dew point temperature range and PWM value, calculates and exports current PWM wave Duty ratio carries out the control of HVAC system demisting motor.
When the sensor of temperature detecting module be connected to windscreen temperature continually and steadily at 20 degree or more when, STM32 control Device will close subsequent intelligent defrosting system by its clock module, only retain the real-time inspection of three parameters of detection module Survey and display function.Temperature detecting module real-time monitoring windscreen temperature, if when raining or by moist cavern, gear There is the case where lower than 20 degree in wind glass temperature, will wake up corresponding clock module, and then start to work.
It will have a direct impact on temperature and humidity suddenly in view of in actual application, occupant's mobility status is complicated and changeable Variation does not reach saturation moisture condensation also in windshield so introducing a safety coefficient in controller internal arithmetic program When condition, it is switched on HVAC demister system.It prevents interior temperature and humidity and rises very rapidly up to saturation value, rapidly keeping out the wind in low temperature The case where condensing on glass, leading to antifog system " failure ".The above entirety is embodied in practical driving as shown in Figure 2.
The controller that the present invention uses is STM32F103 series.Series ARM Cortex-M3 32 with high performance The RISC core of position, with the port I/O abundant and the peripheral hardware for being connected to two APB buses.The device of all models all includes 2 A 12 ADC, 3 general 16 bit timing devices and a PWM timer also include standard and advanced communication interface: up to 2 A I2C and SPI, 3 USART, USB and CAN.Supply voltage 2.0V to 3.6V, a series of battery saving mode guarantee The requirement of low-power consumption.The present invention carries out parameter control using the software platform Keil uVision5 integrating and developing platform of Keil company System and adjustment.
It is of the present invention be a kind of automobile intelligent antifog system based on STM32 single-chip microcontroller, the present invention using STM32F103ZET6 controller, structure is simple, functional, and using effect is good, can solve at current same type system controller The problems such as reason scarce capacity, performance are difficult to improve, the number of modules of extendable functions is few.The system, which not only increases, drives vehicle Safety, and maximumlly accomplished fuel-economizing electricity-saving function.

Claims (9)

1. a kind of automobile intelligent antifog system based on STM32 single-chip microcontroller, including temperature collecting module, humidity collection module, STM32 microcontroller, LCD MODULE, HVAC demister system, signal conditioning circuit, A/D conversion circuit, PWM electric machine speed regulation Module, clock module, communication module, whole system is by automobile power source powered operation, it is characterised in that: the temperature collecting module Acquire the temperature ginseng of the temperature of same point, humidity and windshield before windshield in driver's cabin in real time with humidity collection module Number, collected signal are passed to STM32 microcontroller, STM32 microcontroller by signal conditioning circuit, A/D conversion circuit On the one hand signal is exported as identifiable information, is sent to showing on LCD MODULE;On the other hand pass through pre-set programs, root Real-time dew-point temperature is calculated according to indoor temperature humidity is driven;And it is analyzed and is compared according to the temperature of real-time windshield Compared with, when windscreen temperature be in a certain range lower than dew-point temperature or it is fair when, the duty ratio by adjusting PWM wave is controlled It is antifog that the speed of the demisting motor of HVAC demister system processed reaches intelligence.
2. the automobile intelligent antifog system according to claim 1 based on STM32 single-chip microcontroller, it is characterised in that: the temperature Degree, humidity detecting module are arranged in the position for not influencing close to windshield and driver's driving sight, in real-time detection room Temperature and windscreen temperature;The sensor same position of humidity detecting module and detection room temperature arranges that detection is indoor The humidity of same point.
3. the automobile intelligent antifog system according to claim 1 based on STM32 single-chip microcontroller, it is characterised in that: work as temperature Detection module detect windscreen temperature reach or more than setting safety value when, when the STM32 microcontroller passes through Clock module closes the HVAC demister system;The HVAC is waken up again when windscreen temperature drops to setting safety value or less to remove Mist system, and be in standby, reach and is further continued for work when hazing condition.
4. the automobile intelligent antifog system according to claim 3 based on STM32 single-chip microcontroller, it is characterised in that: work as outdoor Temperature reaches a certain level, i.e., windshield reaches certain temperature, and when will not haze, the STM32 microcontroller can be closed temporarily Close the HVAC demister system.
5. the automobile intelligent antifog system according to claim 1 based on STM32 single-chip microcontroller, it is characterised in that: the liquid Brilliant display module receives temperature and humidity information and motor wind speed size gear data after processing, and it will be shown in LED to show In display screen.
6. the automobile intelligent antifog system according to claim 1 based on STM32 single-chip microcontroller, it is characterised in that: described Heater strip of the HVAC demister system by the window defoggers that keep out the wind after integrated and the hot wind air-conditioning for front window and porthole demisting and complete Face blowing mouth composition.
7. the automobile intelligent antifog system according to claim 1 based on STM32 single-chip microcontroller, it is characterised in that: described STM32 microcontroller, clock module are worked using full-duplex communication mode between communication module, and clock module independently of STM32 microcontroller and communication module work.
8. the automobile intelligent antifog system according to claim 1 based on STM32 single-chip microcontroller, it is characterised in that: described STM32 microcontroller is hazed using judgement, and characteristics algorithm integrates the dew-point temperature calculating of indoor temperature and humidity, existing dew point temperature is met The ratio calculation of calculating of hazing, the range and PWM value of condensing when windscreen temperature, the external information parameter received is according to this Algorithm, which hazes to vehicle window, to be judged.
9. the automobile intelligent antifog system according to claim 8 based on STM32 single-chip microcontroller, it is characterised in that: the dew When carrying out judgement calculating with windscreen temperature, obtained dew-point temperature need to be along with a safety coefficient participates in point temperature again It hazes calculating.
CN201910328397.XA 2019-04-23 2019-04-23 Automobile intelligent antifog system based on STM32 single-chip microcontroller Pending CN110027385A (en)

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Cited By (3)

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Publication number Priority date Publication date Assignee Title
CN112762592A (en) * 2021-01-05 2021-05-07 青岛海尔空调器有限总公司 Window condensation prevention air conditioner and window condensation prevention control method
CN114802105A (en) * 2022-04-12 2022-07-29 岚图汽车科技有限公司 Control method and device for preventing automobile from fogging, controller and storage medium
CN115402263A (en) * 2022-04-26 2022-11-29 中国第一汽车股份有限公司 Intelligent automobile defogging system and automobile

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Application publication date: 20190719

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