CN112158166B - Control method for automatic demisting of automobile and automobile - Google Patents
Control method for automatic demisting of automobile and automobile Download PDFInfo
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- CN112158166B CN112158166B CN202011062377.1A CN202011062377A CN112158166B CN 112158166 B CN112158166 B CN 112158166B CN 202011062377 A CN202011062377 A CN 202011062377A CN 112158166 B CN112158166 B CN 112158166B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
- B60S1/00—Cleaning of vehicles
- B60S1/02—Cleaning windscreens, windows or optical devices
- B60S1/023—Cleaning windscreens, windows or optical devices including defroster or demisting means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
- B60S1/00—Cleaning of vehicles
- B60S1/02—Cleaning windscreens, windows or optical devices
- B60S1/54—Cleaning windscreens, windows or optical devices using gas, e.g. hot air
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/88—Optimized components or subsystems, e.g. lighting, actively controlled glasses
Abstract
The invention relates to a control method for automatic demisting of an automobile and the automobile, which is applied to an automatic demisting system. The method comprises the following steps: when the vehicle is in an ON state, acquiring the temperature in the vehicle, the humidity in the vehicle, the temperature outside the vehicle and the sunshine intensity in real time to calculate the front windshield fogging probability; obtaining the air-conditioning requirements of the user by obtaining the air-conditioning settings of the user; collecting signals of vehicle speed, rainfall, engine water temperature and evaporator air outlet temperature as input of a controller for correcting control parameters; and then according to the front gear fogging probability, the user air conditioner demand, the vehicle speed and other parameters, the opening degree of a temperature air door, an air outlet mode, an air blower gear, an air inlet mode and the compressor state are controlled to automatically demist, so that the manual operation is reduced, and the driving safety is improved.
Description
Technical Field
The invention belongs to the field of automobile air conditioners, and particularly relates to a control method for automatic demisting of an automobile and the automobile.
Background
The automobile front windshield is used for a driver to observe the road condition in front and is of great importance to driving safety. However, when the environmental temperature is low or the number of passengers is large, the front windshield has a large risk of fogging, so that the driving of a driver is influenced, and a large potential safety hazard exists. The mode of present car defogging is manual operation basically, and manual setting air conditioner to defrosting defogging mode when the driver finds the front bumper and hazes promptly, and the compressor was opened this moment, the air-blower amount of wind was transferred to the biggest, air inlet mode is adjusted to the extrinsic cycle and is carried out the defogging, and this mode is the mesh that can reach the defogging, nevertheless needs manual operation, and the mode is not intelligent enough, does not consider weather conditions and air conditioner energy-conservation.
According to the invention, from the premise of meeting the requirements of users, the front bumper fogging risk is obtained by real-time calculation according to parameters such as humidity in the vehicle, temperature outside the vehicle, sunlight intensity and the like, and meanwhile, the requirements of the users on the air conditioner are taken into consideration, parameters such as temperature air door opening, air outlet mode, air blower gear and the like are controlled, and the front bumper fogging is avoided on the premise of meeting the requirements of the users; and signals such as vehicle speed, rainfall, engine water temperature, evaporator air outlet temperature and the like are added into the automatic demisting control, so that the control method is more intelligent, energy-saving and reasonable.
Disclosure of Invention
The invention aims to provide a control method for automatic demisting of an automobile and the automobile, which can automatically avoid front bumper fogging and ensure driving safety.
The purpose of the invention is realized by the following technical scheme:
the embodiment of the invention provides a control method for automatic demisting of an automobile, which is applied to an automatic demisting control system, wherein the automatic demisting control system comprises a thermal management controller, an in-automobile temperature and humidity acquisition module, an out-automobile temperature sensor, a sunshine intensity sensor, an evaporator air outlet temperature sensor and a rainfall acquisition module, which are connected with the thermal management controller, the thermal management controller acquires a vehicle speed signal and an engine water temperature signal through an entire automobile CAN (controller area network) as control signals to be input, and the control method comprises the following steps:
the thermal management controller confirms whether the vehicle power-ON state is ON or not;
if so, the thermal management controller collects the temperature in the vehicle, the humidity in the vehicle, the temperature outside the vehicle and the sunshine intensity in real time;
the thermal management controller calculates the front windshield dew point temperature Td according to the humidity and the temperature in the vehicle;
the thermal management controller calculates the temperature Tw of the inner wall surface of the front windshield according to the temperature in the automobile and the temperature outside the automobile;
the thermal management controller calculates a basic fogging probability Pt according to the front windshield dew point temperature Td and the front windshield inner wall surface temperature Tw;
the thermal management controller calculates sunlight weighted fogging probability Ps according to the sunlight intensity;
the thermal management controller calculates and obtains a front windshield fogging probability P according to the basic fogging probability Pt and the sunlight weighted fogging probability Ps;
meanwhile, the thermal management controller calculates the air conditioner requirement of the user according to the air conditioner setting of the user;
meanwhile, the thermal management controller collects the vehicle speed, the rainfall, the engine water temperature and the evaporator air outlet temperature to be used for correcting control parameters;
the heat management controller controls the opening of a temperature air door, an air outlet mode, a blower gear, an air inlet mode and a compressor state according to the front windshield fogging probability P, the user air conditioner requirement Da, the vehicle speed, the rainfall, the engine water temperature and the evaporator air outlet temperature, so that automatic demisting is realized.
Specifically, the calculation formula of the basic fogging probability Pt is as follows:
Pt=f(Tw-Td)
tw is the temperature of the inner wall surface of the front windshield, and is obtained by calculating the temperature in the vehicle and the temperature outside the vehicle;
td is the front windshield dew point temperature and is obtained through calculation of the humidity in the vehicle and the temperature in the vehicle;
f (Tw-Td) is a function of Tw-Td and is obtained by experimental calibration; the calculation formula of the sunlight weighted fogging probability Ps is as follows:
Ps=f(Ts)
ts is the sunlight intensity measured by a sunlight intensity sensor;
f (Ts) is a function of Ts and is obtained by experimental calibration.
The vehicle speed signal is used for considering the compensation effect of the vehicle speed on the external circulation air inlet and correcting the voltage of the air blower in the external circulation mode; the rainfall signal is used for correcting the air inlet mode so as to reduce the fogging probability of the front windshield increased by the external circulation air inlet mode in rainy days;
the rainfall signal is obtained through a rainfall acquisition module or a real-time weather condition pushed through the Internet; the engine water temperature signal is used for controlling a temperature air door mode, an air outlet mode and a blower gear under the low temperature condition so as to prevent cold air from blowing the surface and ensure the rapid temperature rise of the engine water temperature;
the engine water temperature is collected through a water temperature sensor, and a heat management controller acquires the engine water temperature signal from the water temperature sensor through a whole vehicle CAN; the evaporator air outlet temperature is used for controlling the temperature air door mode, the air outlet mode and the air blower gear under the high-temperature condition so as to prevent hot air from blowing the surface and reduce the influence of air outlet peculiar smell of an air conditioner on passengers.
Specifically, the specific control steps of the opening degree of the temperature air door comprise:
calculating to obtain the opening degree of a temperature air door according to the calculated front windshield fogging probability P and the user air-conditioning requirement Da;
meanwhile, the thermal management controller corrects the actual temperature linearity and theory of the air conditioning box according to prestored correction tables of the opening degrees of the temperature air doors in different air outlet modes.
Specifically, the specific control steps to the air-out mode are:
and the heat management controller inserts a value into a pre-stored corresponding relation table of the front gear fogging probability P, the user air-conditioning requirement Da and the air outlet mode according to the front gear fogging probability P and the user air-conditioning requirement Da obtained through calculation.
Specifically, the specific control method for the gear of the blower comprises the following steps:
and the thermal management controller inserts values into a pre-stored corresponding relation table of the front gear fogging probability P, the user air-conditioning demand Da and the blower gear according to the calculated front gear fogging probability P and the user air-conditioning demand Da.
Specifically, the specific control steps for the air inlet mode are as follows:
and the heat management controller inserts a specific air inlet mode from a pre-stored corresponding relation table of the front gear fogging probability P, the user air conditioner demand Da and the air inlet mode according to the calculated front gear fogging probability P and the user air conditioner demand Da, wherein the air inlet mode can be divided into an inner circulation state, an outer circulation state and an inner circulation compensation state.
Specifically, the specific control steps for the compressor state are as follows:
the heat management controller determines whether to start the compressor or not according to the calculated front windshield fogging probability P and the user air-conditioning requirement Da;
the heat management controller is pre-stored with a cut-off logic table for cutting off and controlling the compressor based on the front windshield fogging probability P and the user air conditioning demand Da, and the cut-off logic table is used for protecting the compressor from being damaged in a specific state.
The invention also provides an automobile comprising the control method for automatically demisting the automobile.
The invention has the following advantages:
(1) According to the invention, according to the front bumper fogging risk and the requirement of a user on an air conditioner, parameters such as the opening degree of a temperature air door, an air outlet mode and a blower gear are automatically controlled, and the front bumper fogging is avoided on the premise of meeting the requirement of the user;
(2) The invention adds the signals of vehicle speed, rainfall, engine water temperature, evaporator air-out temperature and the like into the automatic demisting control, so that the control method is more intelligent, energy-saving and reasonable.
Drawings
FIG. 1 is a flow chart of a control strategy of an automatic defogging control method for an automobile according to the present invention;
FIG. 2 is a schematic control diagram of an air-out mode according to the present invention;
FIG. 3 is a schematic control diagram of the air intake mode of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings, but the embodiments of the present invention are not limited thereto.
As shown in fig. 1, the present embodiment provides a control method for automatic defogging of an automobile, which is applied to an automatic defogging control system of an automobile, where the automatic defogging control system of an automobile includes a thermal management controller, an in-automobile temperature and humidity acquisition module, an out-automobile temperature sensor, a sunshine sensor, an evaporator temperature sensor, and a rainfall acquisition module, which are connected to the thermal management controller, and the thermal management controller obtains signals of an automobile speed, an engine water temperature, and the like as control signals to be input. The control method specifically comprises the following steps:
the thermal management controller confirms whether the vehicle power-ON state is ON;
if so, the thermal management controller acquires the air temperature, the air humidity, the temperature outside the vehicle and the sunshine intensity in the vehicle in real time through the sensors;
the thermal management controller calculates the front windshield dew point temperature Td according to the humidity in the vehicle and the temperature signal in the vehicle;
the thermal management controller calculates the temperature Tw of the inner wall surface of the front windshield according to the temperature in the automobile and the temperature signal outside the automobile;
the thermal management controller calculates a basic fogging probability Pt according to the front windshield dew point temperature Td and the front windshield inner wall surface temperature Tw;
the thermal management controller calculates sunlight weighted fogging probability Ps according to the sunlight intensity signal;
the thermal management controller calculates and obtains a front bumper fogging probability P according to the basic fogging probability Pt and the sunlight weighted fogging probability Ps;
meanwhile, the thermal management controller calculates the air-conditioning requirement of the user according to the air-conditioning setting of the user;
meanwhile, collecting signals of vehicle speed, rainfall, engine water temperature and evaporator air outlet temperature for correcting control parameters;
the thermal management controller controls the opening of a temperature air door, an air outlet mode, a blower gear, an air inlet mode and a compressor state to automatically demist according to the front windshield fogging probability P, user air conditioner requirements, vehicle speed, rainfall, engine water temperature, evaporator air outlet temperature and other parameters;
specifically, the calculation formula of the basic fogging probability Pt is as follows:
Pt=f(Tw-Td)
tw is the temperature of the inner wall surface of the front windshield, and is obtained by calculating signals of the temperature inside the automobile and the temperature outside the automobile;
td is the front windshield dew point temperature and is obtained through calculation of the humidity in the vehicle and the temperature signal in the vehicle;
f (Tw-Td) is a function of Tw-Td and is obtained by experimental calibration.
Specifically, the calculation formula of the sunlight weighted fogging probability Ps is as follows:
Ps=f(Ts)
ts is the sunlight intensity measured by a sunlight intensity sensor;
f (Ts) is a function of Ts and is determined by experimental calibration.
Specifically, the control method needs to give consideration to the air conditioning requirements of the user, and the air conditioning requirements Da of the user are calculated according to the air conditioning settings of the user, the temperature inside the vehicle, the temperature outside the vehicle, the sunlight intensity and other parameters, and are used for evaluating the requirement intensity of the user, and the function of the requirement intensity is similar to that of the front windshield fogging probability P.
Specifically, the vehicle speed signal is used for correcting the blower voltage in the external circulation mode by considering the compensation effect of the vehicle speed on the external circulation air inlet.
Specifically, the rainfall signal is used for correcting the air inlet mode so as to reduce the fogging probability of the front windshield increased in the external circulation air inlet mode in rainy days;
the rainfall signal is acquired through the rainfall acquisition module and can also be acquired through the real-time weather condition pushed by the Internet.
Specifically, the engine water temperature signal is used for controlling a temperature air door mode, an air outlet mode, an air blower gear and the like under a low-temperature condition so as to prevent cold air from blowing on the surface and ensure that the engine water temperature is quickly increased;
the water temperature of the engine is collected through a water temperature sensor, and a heat management controller acquires signals through a CAN of the whole vehicle.
Specifically, the evaporator air outlet temperature is used for controlling a temperature air door mode, an air outlet mode, an air blower gear and the like under a high-temperature condition so as to prevent hot air from blowing the surface and reduce the influence of air outlet peculiar smell of the air conditioner on passengers.
Specifically, the specific control method of the opening degree of the temperature air door comprises the following steps:
and calculating to obtain the opening degree of the temperature air door according to the calculated front baffle fogging probability P and the user air conditioner requirement Da, and meanwhile, storing a correction table of the opening degrees of the temperature air doors in different air outlet modes in the thermal management controller for correcting the deviation of the actual temperature linearity and the theory of the air conditioner box.
Specifically, the specific control method of the air outlet mode comprises the following steps:
and interpolating according to the calculated front windshield fogging probability P and the user air conditioner requirement Da to obtain an air outlet mode, wherein a corresponding relation table (shown in figure 2) of the front windshield fogging probability, the user air conditioner requirement and the air outlet mode is stored in the thermal management controller.
Specifically, the specific control method of the blower gear comprises the following steps:
and interpolating according to the calculated front windshield fogging probability P and the user air conditioner requirement Da to obtain the gear of the air blower, wherein a corresponding relation table of the front windshield fogging probability, the user air conditioner requirement and the gear of the air blower is stored in the thermal management controller.
Specifically, the specific control method of the air intake mode comprises the following steps:
and interpolating to obtain a specific air inlet mode according to the calculated front windshield fogging probability P and the user air conditioner requirement Da, wherein the air inlet mode can be divided into an internal circulation state, an external circulation state and an internal circulation compensation state, and a corresponding relation table (shown in figure 3) of the front windshield fogging probability, the user air conditioner requirement and the air inlet mode is stored in the thermal management controller.
Specifically, the specific control method of the compressor state comprises the following steps:
whether the compressor is started or not is determined according to the calculated front windshield fogging probability P and the user air-conditioning demand Da, and the heat management controller stores the shutdown logic related to the compressor and is used for protecting the compressor from being damaged in a specific state.
According to the automatic defogging control method, the front bumper fogging risk can be considered, meanwhile, the requirement of a user on an air conditioner is considered, parameters such as the opening degree of a temperature air door, an air outlet mode and a blower gear are automatically controlled, and the front bumper fogging is avoided on the premise that the requirement of the user is met; the invention adds the signals of vehicle speed, rainfall, engine water temperature, evaporator air-out temperature and the like into the automatic demisting control, so that the control method is more intelligent, energy-saving and reasonable.
The invention also provides an automobile which comprises the control method for automatically demisting the automobile.
The above is a brief description of the automatic defogging control method for an automobile, which is used to illustrate the control method and not to limit the same. Although only one embodiment is described in detail herein, it should be understood by those skilled in the art that: other control methods can still be converted by modifying the technical scheme provided by the embodiment or replacing part of technical features; such modifications and substitutions do not depart from the spirit and scope of the present invention in its broadest form.
Claims (6)
1. The control method for automatic demisting of the automobile is applied to an automatic demisting control system and is characterized in that the automatic demisting control system comprises a thermal management controller, and an automobile temperature and humidity acquisition module, an automobile outside temperature sensor, a sunlight intensity sensor, an evaporator air outlet temperature sensor and a rainfall acquisition module which are connected with the thermal management controller, wherein the thermal management controller acquires a vehicle speed signal and an engine water temperature signal through an automobile CAN (controller area network) and inputs the signals as control signals, and the control method comprises the following steps:
the thermal management controller confirms whether the vehicle power-ON state is ON or not;
if so, the thermal management controller collects the temperature in the vehicle, the humidity in the vehicle, the temperature outside the vehicle and the sunshine intensity in real time;
the thermal management controller calculates the front windshield dew point temperature Td according to the humidity and the temperature in the vehicle;
the thermal management controller calculates the temperature Tw of the inner wall surface of the front windshield according to the temperature in the automobile and the temperature outside the automobile;
the thermal management controller calculates a basic fogging probability Pt according to the front windshield dew point temperature Td and the front windshield inner wall surface temperature Tw;
the thermal management controller calculates sunlight weighted fogging probability Ps according to the sunlight intensity;
the thermal management controller calculates and obtains a front windshield fogging probability P according to the basic fogging probability Pt and the sunlight weighted fogging probability Ps;
meanwhile, the heat management controller calculates the air-conditioning requirement Da of the user according to the air-conditioning setting of the user;
meanwhile, the thermal management controller collects the vehicle speed, the rainfall, the engine water temperature and the evaporator air outlet temperature to be used for correcting control parameters;
the heat management controller controls the opening of a temperature air door, an air outlet mode, a gear of an air blower, an air inlet mode and a compressor state according to the front windshield fogging probability P, the user air conditioner requirement Da, the vehicle speed, the rainfall, the water temperature of an engine and the air outlet temperature of an evaporator, so that automatic demisting is realized;
the rainfall signal is used for correcting the air inlet mode so as to reduce the fogging probability of the front windshield increased by the external circulation air inlet mode in rainy days;
the calculation formula of the basic fogging probability Pt is as follows:
Pt=f(Tw-Td)
tw is the temperature of the inner wall surface of the front windshield, and is obtained by calculating the temperature in the vehicle and the temperature outside the vehicle;
td is the front windshield dew point temperature and is obtained through calculation of the humidity in the vehicle and the temperature in the vehicle;
f (Tw-Td) is a function of Tw-Td and is obtained by experimental calibration;
the calculation formula of the sunshine weighted fogging probability Ps is as follows:
Ps=f(Ts)
wherein Ts is the sunlight intensity measured by a sunlight intensity sensor;
f (Ts) is a function of Ts and is obtained by test calibration;
the air inlet mode is specifically controlled by the following steps:
the heat management controller inserts values into a pre-stored correspondence table of the front gear fogging probability P, the user air conditioner demand Da and the air inlet mode according to the calculated front gear fogging probability P and the user air conditioner demand Da;
in a corresponding relation table of the front gear fogging probability P, the user air conditioner demand Da and the air inlet mode, the air inlet mode can be divided into an internal circulation state, an external circulation state and an internal circulation compensation state;
the specific control steps for the compressor state are as follows:
the heat management controller determines whether to start the compressor according to the calculated front windshield fogging probability P and the user air conditioner requirement Da;
the heat management controller is pre-stored with a cut-off logic table for cutting off and controlling the compressor based on the front windshield fogging probability P and the user air conditioning demand Da, and the cut-off logic table is used for protecting the compressor from being damaged in a specific state.
2. The control method for automatically defogging an automobile according to claim 1, wherein: the vehicle speed signal is used for considering the compensation effect of the vehicle speed on the external circulation air inlet and correcting the voltage of the air blower in the external circulation mode; the rainfall signal is obtained through a rainfall acquisition module or a real-time weather condition pushed through the Internet; the engine water temperature signal is used for controlling a temperature air door mode, an air outlet mode and an air blower gear under the low-temperature condition so as to prevent cold air from blowing the surface and ensure that the engine water temperature is quickly increased;
the engine water temperature is collected through a water temperature sensor, and a heat management controller acquires the engine water temperature signal from the water temperature sensor through a whole vehicle CAN; the air outlet temperature of the evaporator is used for controlling the temperature air door mode, the air outlet mode and the air blower gear under the high-temperature condition, so that the hot air is prevented from blowing the surface, and meanwhile, the influence of the air outlet peculiar smell of the air conditioner on passengers is reduced.
3. The control method for automatically defogging an automobile according to any one of claims 1-2, wherein the temperature damper opening degree is specifically controlled by the steps of:
calculating the opening degree of a temperature air door according to the calculated front windshield fogging probability P and the user air conditioning requirement Da;
and meanwhile, the thermal management controller corrects the deviation between the actual temperature linearity and the theory of the air conditioning box according to a prestored correction table of the opening degree of the temperature air door in different air outlet modes.
4. The control method for automatically defogging the automobile according to any one of claims 1-2, wherein the specific control steps for the air-out mode are as follows:
and the heat management controller inserts a value into a pre-stored corresponding relation table of the front gear fogging probability P, the user air-conditioning requirement Da and the air outlet mode according to the front gear fogging probability P and the user air-conditioning requirement Da obtained through calculation.
5. The control method for automatically defogging the automobile according to any one of claims 1-2, wherein the specific control steps for the shift position of the blower are as follows:
and the thermal management controller inserts a value into a corresponding relation table of the pre-stored front gear fogging probability P, the user air conditioner demand Da and the air blower gear according to the calculated front gear fogging probability P and the user air conditioner demand Da.
6. An automobile comprising the control method for automatically defogging the automobile according to any one of claims 1 to 5.
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| CN112848838B (en) * | 2021-01-18 | 2022-10-28 | 中国第一汽车股份有限公司 | Fog-proof control method for low-temperature high-speed working condition of vehicle |
| CN113119687B (en) * | 2021-05-07 | 2022-12-23 | 戴凯丽 | Automatic control method for working modes of air and air conditioner in automobile |
| CN113370746B (en) * | 2021-06-30 | 2022-05-27 | 一汽奔腾轿车有限公司 | Demisting closed-loop control system of pure electric vehicle heat pump system and control method thereof |
| CN113665531B (en) * | 2021-09-08 | 2023-06-06 | 东风柳州汽车有限公司 | Vehicle defogging method, device, equipment and storage medium |
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