CN106891861B - Defrosting control system and method for electric automobile - Google Patents
Defrosting control system and method for electric automobile Download PDFInfo
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- CN106891861B CN106891861B CN201710138480.1A CN201710138480A CN106891861B CN 106891861 B CN106891861 B CN 106891861B CN 201710138480 A CN201710138480 A CN 201710138480A CN 106891861 B CN106891861 B CN 106891861B
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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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Abstract
The invention discloses a defrosting control system and a defrosting control method for an electric automobile, wherein the defrosting initial stage is a low-temperature large-flow defrosting mode, hot air can uniformly cover the whole defrosting glass area, and the temperature of the whole frost layer is uniformly increased; when defrosting is carried out for a first preset time, the temperature of defrosting hot air is increased, the flow of an air outlet is correspondingly reduced under the condition that defrosting power is unchanged, the angle of the air outlet is correspondingly adjusted, and at the moment, a high-temperature medium-flow defrosting mode is adopted, and the defrosting hot air temperature is increased to enable a frost layer in a visual field area to be quickly melted; when the defrosting is carried out for the second preset time, the temperature of the defrosting hot air is reduced, the flow of the air outlet is correspondingly reduced, the angle of the air outlet is correspondingly adjusted, and at the moment, the defrosting mode is a low-temperature small-flow defrosting mode.
Description
Technical Field
The invention relates to an electric automobile defrosting control system and a control method thereof.
Background
In cold winter in the north, frosting of the front windshield of the automobile is a frequently encountered problem, and particularly, the frost layer in the visual field area of a driver directly influences the safety of the automobile in the driving process. The traditional automobile defrosting system utilizes the waste heat of the cooling circulating water of the engine to introduce a heat exchanger, heats the introduced air and then sends the heated air into a defrosting air channel to defrost the windshield. However, with the application of pure electric vehicles and hybrid vehicles, there is no engine or enough engine waste heat to heat the cold air, and in the cold winter in north, the vehicle needs to be defrosted before starting, so that the defrosting device with an electric heater needs to be used for defrosting.
In the traditional defrosting process, the temperature and the flow of hot air are kept unchanged, when the consumed energy is low, namely the defrosting temperature is low or the flow is low, the defrosting effect is poor, the defrosting time cannot meet the defrosting requirement, and in order to obtain a good defrosting effect, when the temperature and the flow of defrosting air flow are too high, the energy is wasted.
Disclosure of Invention
The invention aims to solve the problems and provides an electric automobile defrosting control system and a control method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides an electric automobile defrosting control system, includes air-blower, electric heater, the control unit, defrosting wind channel and defrosting tuber pipe, wherein, the air-blower is connected and is set up in defrosting wind channel one end, is provided with electric heater in the defrosting wind channel, and electric heater is connected with the control unit, is provided with a plurality of defrosting tuber pipes on the defrosting wind channel, the afterbody of defrosting tuber pipe is equipped with the air outlet, and the air outlet is parallel arranges in windshield department, and every air outlet is equipped with the regulator of adjustment air outlet angle, the control unit is connected with the detection module who measures external environment temperature, the control unit sets up a plurality of segment time according to ambient temperature, and control electric heater, regulator and air-blower are in different operating modes, carry out.
The angle adjustment range of the air outlet is 55-75 degrees.
The air outlet is provided with a manual regulator.
A control method based on the system comprises the following steps: detecting the ambient temperature, setting at least three time periods by the control unit according to the ambient temperature, and controlling the air blower to work in a first gear condition and the electric heater to work in a second gear condition in a first time period; in a second time period, controlling the air blower to work in a second gear working condition and controlling the electric heater to work in a first gear working condition; in a third time period, controlling the air blower to work in a third gear working condition and the electric heater to work in the third gear working condition, and continuously adjusting the angle of each air outlet by the controller in the three time periods; and the power of the first gear working condition of the air blower and the electric heater is greater than that of the second gear working condition, and the power of the second gear working condition is greater than that of the third gear working condition.
By the design, the defrosting mode is a low-temperature large-flow mode before defrosting in the first time period, hot air can uniformly cover the whole defrosting glass area, the temperature of the whole frost layer is uniformly increased, and the frost layer starts to be uniformly melted.
And in the second time period, the defrosting mode is adjusted to be a high-temperature medium flow mode, namely the hot air flow of the defrosting air outlet is properly reduced by controlling, the defrosting hot air temperature is increased under the condition of unchanged power, the hot air flow direction is adjusted to be in a forward blowing visual field area, the defrosting temperature is increased, so that the frost layer in the visual field area of the driver can be melted in a short time, the influence of the frost layer on the driver is reduced, and the driving safety is ensured.
When the frost layers in the visual field area are completely melted, the heating power is reduced, the defrosting mode is adjusted to be a low-temperature small-flow mode, the temperature of defrosting hot air is controlled to be reduced, the hot air flow of a defrosting air outlet is reduced, the flow direction of the hot air is adjusted, most of the frost layers in the glass area are melted, the low-temperature small-flow defrosting hot air can ensure that the frost layers at the edge of the windshield are gradually melted, secondary frosting is not caused, and the energy consumed by defrosting is greatly saved.
Therefore, the time period is divided to save energy consumption and is related to the ambient temperature, the time period is obtained by defrosting and demisting simulation calculation and test of a large number of vehicle types, and the result is as follows:
preferably, the first period of time is (0, 5 e)sin∣T∣]And T is the detected ambient temperature in degrees Celsius and is a negative value.
The second time period is (5 e)sin∣T∣，
T is the measured ambient temperature in degrees Celsius and is a negative value.
In the first time period, the angle of the air outlet is 58-64 degrees.
In the second time period, the angle of the air outlet is 68-73 degrees.
In the third time period, the angle of the air outlet is 60-66 degrees.
The invention has the beneficial effects that:
(1) the problems that in the existing defrosting process, the defrosting effect of each area of the windshield is inconsistent and defrosting energy is wasted because the hot air temperature and the hot air flow of a defrosting air outlet are kept constant are solved;
(2) the control of the hot air temperature and the hot air flow is carried out on different defrosting stages, the defrosting efficiency is improved, and the energy consumed by defrosting is saved;
(3) the air outlet angle has an electric mode and a manual mode, so that the defrosting can be effectively carried out according to the actual condition;
(4) the defrosting is divided into three stages, and the three stages respectively correspond to different defrosting hot air temperatures and flow rates according to the change characteristics of the frost layer, so that the defrosting requirement of the windshield is met, the defrosting efficiency is improved, and the energy consumed by defrosting is saved.
Drawings
FIG. 1 is a flow chart of a control method of the present invention;
FIG. 2 is a schematic structural diagram of an electric vehicle defroster provided by the present invention;
FIGS. 3(a) - (c) are cloud charts of the change of frost layer in each time period in the method of the present invention;
wherein: 1-a blower; 2-an electric heater; 3-an air-conditioning control unit; 4, a defrosting air channel; 5, defrosting an air pipe; and 6, defrosting an air outlet.
The specific implementation mode is as follows:
the invention is further described with reference to the following figures and examples.
Fig. 1 is a schematic flow chart of an electric vehicle defrost control strategy according to an embodiment of the present invention. As shown in fig. 1, the electric vehicle defrosting control strategy includes the following steps:
s1: the ambient temperature is detected before defrosting.
S2: and calculating preset time according to the detected temperature, and determining the hot air flow and the air outlet angle.
S3: and (5) controlling the temperature of defrosting hot air, the flow rate and the flow direction of the hot air at the beginning of defrosting, and performing in a low-temperature large-flow defrosting mode.
In particular, the predetermined time is related to the detected ambient temperature, upon detectionMeasured ambient temperature T, wherein the first preset time: t is t1＝5esin∣T∣The unit is centigrade and is a negative value, and the second preset time is as follows:
units are degrees celsius and are negative. And controlling the hot air heating temperature of an electric heater in the defrosting device and the hot air flow of a defrosting air outlet according to the determined air outlet hot air flow and air outlet angle, and adjusting the air outlet angle to be 58-64 degrees. The large hot air flow can uniformly cover the whole defrosting area, the temperature of a frost layer needs to be uniformly increased in the initial defrosting stage, preliminary melting starts to occur, and the required defrosting temperature does not need to be high.
S4: and after the first preset time, ensuring that the power is unchanged, increasing the temperature of hot air, properly reducing the flow of the hot air, adjusting the flow of the hot air to a forward-blowing visual field area, and defrosting in a high-temperature medium-flow defrosting mode.
When the defrosting device starts to operate, the defrosting operation time is recorded, for example, the defrosting operation time is recorded by a timer, and when defrosting is carried out to a first preset time t1And then, the frost layer starts to be uniformly melted, the visual field area of the windshield can be subjected to targeted preferential defrosting, namely, the temperature of defrosting hot air is controlled to be increased, the hot air flow direction of the air outlet is adjusted to be in a forward blowing visual field area, namely, the angle of the air outlet is 68-73 degrees, so that the frost layer in the visual field area of a driver is melted in a short time, the influence of the frost layer on the driver is reduced, and the driving safety is ensured. At the moment, the power is ensured to be unchanged, the hot air flow of the defrosting air outlet is properly reduced, and the energy consumption can be reduced while the defrosting requirement is ensured.
S5: and after the second preset time, reducing the temperature and the flow of the hot air, properly adjusting the angle of the air outlet, and defrosting in a low-temperature small-flow defrosting mode.
Specifically, after the frost layer in the visual field is completely melted, i.e. the high-temperature medium-flow defrosting mode is performed for the second preset time t2Then, the temperature of the defrosting hot air is controlled to be reduced, the flow of the defrosting air outlet hot air is reduced, and the angle of the air outlet is properly adjusted to60 to 66 degrees. At the moment, frost layers at the upper edge part and the lower edge part of the windshield are not completely melted, if the defrosting is still carried out by hot air with high temperature and medium flow, compared with the low-temperature and small-flow hot air defrosting, a good defrosting effect cannot be obtained, and energy waste can be caused.
S6: and (4) completely melting the frost layer of the windshield, and finishing defrosting.
In summary, the defrosting control strategy of the electric vehicle according to the embodiment of the present invention is to divide the defrosting process into three stages on the premise of ensuring that the defrosting requirement is met: the defrosting mode is a low-temperature large-flow defrosting mode at the initial stage of defrosting, the high-temperature medium-flow defrosting mode is adjusted after defrosting is carried out for the first preset time, and the low-temperature small-flow defrosting mode is adjusted after defrosting is carried out for the second preset time. According to the change characteristics of frost layers at different stages of defrosting, the hot air temperature and the hot air flow rate of defrosting are adjusted, and simulation analysis and experimental verification show that the defrosting efficiency is improved, and the energy waste is reduced.
As shown in fig. 2, the invention also provides a defrosting device for an electric vehicle, which comprises an air blower 1, a defrosting air duct 4 connected with an air outlet of the air blower, an electric heater 2 packaged in the defrosting air duct, and an air conditioner control unit 3 for controlling the electric heater.
And preferably, the defrosting air duct 4 is guided by the defrosting air duct 5, and then a plurality of defrosting air outlets 6 are arranged in parallel at the position of the instrument panel close to the windshield, and each defrosting air outlet 6 is provided with a corresponding electric control handle, so that the air outlet angle of the defrosting air outlet is adjusted in good time, and the electric control handles are controlled by the air conditioner control unit.
The air outlet angle adjustment values sequentially correspond to 58-64 degrees, 68-73 degrees and 60-66 degrees.
The electric heater assembly is packaged in the defrosting air channel and connected with the air conditioner control unit, the air conditioner control unit is connected with the detection module, and the detection module is used for detecting the ambient temperature.
As shown in fig. 3(a) - (c), the defrosting process is divided into three stages by detecting the ambient temperature and according to the preset defrosting time under the premise of ensuring that the defrosting requirement is met: the defrosting mode is a low-temperature large-flow defrosting mode at the initial stage of defrosting, the high-temperature medium-flow defrosting mode is adjusted after defrosting is carried out for the first preset time, and the low-temperature small-flow defrosting mode is adjusted after defrosting is carried out for the second preset time. According to the change characteristics of frost layers at different stages of defrosting, the hot air temperature, the hot air flow and the hot air flow direction of defrosting are adjusted, and simulation analysis and experimental verification show that the defrosting efficiency is improved and the energy consumed by defrosting is greatly saved.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (7)
1. The utility model provides an electric automobile defrosting control system which characterized by: the defrosting device comprises an air blower, an electric heater, a control unit, a defrosting air channel and defrosting air pipes, wherein the air blower is connected to one end of the defrosting air channel, the electric heater is arranged in the defrosting air channel, the electric heater is connected with the control unit, the defrosting air channel is provided with a plurality of defrosting air pipes, the tail parts of the defrosting air pipes are provided with air outlets, the air outlets are arranged at the positions of windshields in parallel, each air outlet is provided with an adjuster for adjusting the angle of the air outlet, the control unit is connected with a detection module for measuring the external environment temperature, the control unit is provided with three defrosting modes of low-temperature large flow, high-temperature medium flow and low-temperature small flow according to the environment temperature, the control unit is provided with a plurality of segment times according to the environment temperature, and; the angle adjustment range of the air outlet is 55-75 degrees;
the control unit sets at least three time periods according to the environment temperature, and in the first time period, the blower is controlled to work in a first gear working condition and the electric heater works in a second gear working condition, so that the defrosting mode is a low-temperature large-flow defrosting mode; in a second time period, controlling the air blower to work in a second gear condition and the electric heater to work in a first gear condition, wherein the high-temperature medium-flow defrosting mode is adopted; in a third time period, controlling the air blower to work in a third gear working condition and the electric heater to work in the third gear working condition, and adopting a low-temperature small-flow defrosting mode;
the first time period is (0, 5 e)sin|T|]T is the detected ambient temperature in centigrade; the second time period is
T is the detected ambient temperature in degrees Celsius.
2. The defrosting control system for the electric automobile according to claim 1, which is characterized in that: the air outlet is provided with a manual regulator.
3. A control method of the control system according to any one of claims 1-2, characterized by: the method comprises the following steps: detecting the ambient temperature, setting at least three time periods by the control unit according to the ambient temperature, and controlling the air blower to work in a first gear condition and the electric heater to work in a second gear condition in the first time period to adopt a low-temperature large-flow defrosting mode; in a second time period, controlling the air blower to work in a second gear condition and the electric heater to work in a first gear condition, wherein the high-temperature medium-flow defrosting mode is adopted; in a third time period, controlling the air blower to work in a third gear working condition and the electric heater to work in the third gear working condition, and adopting a low-temperature small-flow defrosting mode;
the first time period is (0, 5 e)sin|T|]T is the detected ambient temperature in centigrade; the second time period is
T is the detected ambient temperature in degrees Celsius.
4. A control method according to claim 3, characterized in that: in three time periods, the controller continuously adjusts the angle of each air outlet; and the power of the first gear working condition of the air blower and the electric heater is greater than that of the second gear working condition, and the power of the second gear working condition is greater than that of the third gear working condition.
5. A control method according to claim 3, characterized in that: in the first time period, the angle of the air outlet is 58-64 degrees.
6. A control method according to claim 3, characterized in that: in the second time period, the angle of the air outlet is 68-73 degrees.
7. A control method according to claim 3, characterized in that: in the third time period, the angle of the air outlet is 60-66 degrees.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710138480.1A CN106891861B (en) | 2017-03-09 | 2017-03-09 | Defrosting control system and method for electric automobile |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710138480.1A CN106891861B (en) | 2017-03-09 | 2017-03-09 | Defrosting control system and method for electric automobile |
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| CN106891861B true CN106891861B (en) | 2021-02-23 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109866739B (en) * | 2019-03-28 | 2024-02-20 | 吉林大学 | Solar intelligent defrosting device and control method thereof |
| CN110696775A (en) * | 2019-10-28 | 2020-01-17 | 浙江吉利汽车研究院有限公司 | Windshield defrosting system and car |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE502008002936D1 (en) * | 2008-01-24 | 2011-05-05 | Behr France Rouffach Sas | Device for window deicing |
| CN102205782B (en) * | 2010-10-15 | 2013-06-19 | 浙江吉利汽车研究院有限公司 | Automatically-antifogging air-conditioning system and antifogging method |
| CN103569064A (en) * | 2012-08-09 | 2014-02-12 | 北汽福田汽车股份有限公司 | Vehicle windscreen dehumidifying and defrosting device |
| KR20150129385A (en) * | 2014-05-12 | 2015-11-20 | 주식회사 동우티엔씨 | A frost protection heater at glass on the car |
| CN104442281B (en) * | 2014-12-08 | 2016-11-30 | 重庆瑞阳科技开发有限公司 | A kind of automobile and air-conditioner controller module thereof |
| CN104960500B (en) * | 2015-07-14 | 2017-02-01 | 安徽江淮汽车股份有限公司 | Control method and system for controlling defrosting heating device, and defrosting heating device |
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