CN113514257A - Performance evaluation standard evaluation method for passenger vehicle driving condition windshield defogging system - Google Patents
Performance evaluation standard evaluation method for passenger vehicle driving condition windshield defogging system Download PDFInfo
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- 238000011156 evaluation Methods 0.000 title claims abstract description 89
- 238000012360 testing method Methods 0.000 claims abstract description 43
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
Abstract
The invention relates to a demisting system performance evaluation standard evaluation method under a driving condition of a passenger vehicle, which comprises the following steps: arranging a sensor on a tested sample vehicle, and carrying out precooling treatment and fog generation on the vehicle in a low-temperature environment cabin; adjusting an air conditioning system of the tested vehicle, operating low-temperature environment cabin equipment, and carrying out a driving defogging test under a preset working condition; collecting test data of the vehicle under test by a data acquisition system, and drawing a defogging trace in a corresponding time period to obtain a sensor measurement value and a defogging area contour map; formulating a performance evaluation standard of a passenger vehicle driving condition windshield defogging system; and judging the performance of the passenger vehicle driving condition windshield demisting system based on the evaluation standard. The evaluation method for the demisting system performance evaluation standard under the driving working condition of the passenger vehicle provides important reference for researching the demisting system performance of the passenger vehicle and developing an efficient demisting system.
Description
Technical Field
The invention belongs to the technical field of automobile air conditioners, and particularly relates to a passenger vehicle driving condition windshield defogging system performance evaluation standard evaluation method.
Background
With the progress of society and the rapid development of the automobile industry, people put higher demands on the safety and comfort of automobiles. The frost fog degradation performance of automobile windshield glass is regarded as an active safety standard which is enforced by more and more researchers.
The inner surface of the automobile windshield glass is fogged physically, namely, condensation phenomenon, when the temperature of the external environment is low in rainy weather or air is relatively humid, and after the temperature difference between the inside and the outside of the automobile reaches a certain value, the humid air in the automobile touches the windshield glass and is condensed to form a layer of fog or frost. The two basic conditions of fog formation are that the humidity is large and the temperature difference between the inside and the outside of the vehicle is large. Once the fog on the vehicle windshield will influence the sight of the driver, at this time, if the quick and effective treatment cannot be carried out, the visibility of the driver can be reduced, the driving visual field of the driver is influenced, and after the side window and the rear window are fogged, the driver is difficult to observe the road condition through the rearview mirrors inside and outside the vehicle, so that great threat can be caused to the safety of driving passengers. Therefore, the method has very important practical significance for the research on the performance of the windshield defogging system under the driving working condition of the automobile.
The prior art discloses an injection system of an automobile glass demisting system based on high-temperature air jet, which forms a continuous and closed high-temperature high-speed air flow field on the surface of the front windshield of a vehicle through multi-point jet, eliminates the temperature difference between the inside and the outside of the glass and realizes the demisting function of the surface of the front windshield of the vehicle. The prior art also discloses an automatic defogging system for the inner surface of the evaporative automobile glass, wherein a controller receives signals of sensor modules such as temperature and humidity and controls the switching of the conversion valve and the opening and closing of the air duct valve. Can realize that the automatic prevention of carrying out before the automobile glass surface produces the fog or carry out quick defogging, improve driver's travelling comfort and security. The prior art also discloses an optical demisting system and method for automobile glass, whether the inner surface of a vehicle window reaches a condensation state is judged through an optical element, automatic prevention can be carried out before fog is generated, and quick demisting can be automatically carried out by adopting a method for calculating the condensation thickness of water vapor and controlling the switch of a switching valve through a controller terminal. However, in actual use, there is no systematic evaluation standard evaluation method for the performance research of the defogging system under the driving condition of the passenger vehicle.
Disclosure of Invention
The invention aims to provide a method for evaluating the performance evaluation standard of a passenger vehicle driving condition windshield defogging system, so as to solve the problem of judging the defogging performance of the passenger vehicle driving condition windshield defogging system
The purpose of the invention is realized by the following technical scheme:
a demisting system performance evaluation standard evaluation method under a driving condition of a passenger vehicle is characterized by comprising the following steps:
s1, arranging a sensor on the tested sample vehicle, and carrying out precooling treatment and fog generation on the vehicle in a low-temperature environment cabin;
s2, adjusting an air conditioning system of the vehicle to be tested, operating the low-temperature environment cabin equipment, and carrying out a driving defogging test under a preset working condition;
s3, collecting test data of the vehicle under test through a data acquisition system, and drawing defogging traces corresponding to time periods to obtain a sensor measurement value and a defogging area contour map;
s4, selecting an evaluation index, and formulating a passenger vehicle driving condition windshield defogging system performance evaluation standard according to a passenger vehicle driving condition windshield defogging system performance real vehicle test result and in combination with the vehicle actual use condition;
and S5, judging the performance of the windshield defogging system of the passenger vehicle under the driving condition based on the evaluation standard.
Further, in step S1, sensors are disposed at the warm air inlet/outlet water, the defroster outlet, and the front windshield of the vehicle under test.
More closely, the sensor is arranged at the center of the end face of the hot air inlet, the center of the end face of the hot air outlet, the center of the end face of the defrosting air outlet and the outer surface of the windshield, wherein the center of the end face of the defrosting air outlet is inserted by 25 mm.
Further, in step S3, the defogging area calculation includes the following steps: firstly, converting a picture bitmap into a vector diagram, and importing a parchment paper topological photo; carrying out image vectorization and storing the vector diagram; and opening the stored file, editing, capturing and creating a face area through a curve, and calculating the area of each demisting area.
Further, in step S4, the evaluation indexes include a driver-side wiper blade movement coverage area, a co-driver-side wiper blade movement coverage area, defrosting areas of the left outer rear view mirror and the right outer rear view mirror, and a warm air intake temperature and a defrosting air outlet temperature, and the six evaluation indexes are convenient for quantitative assessment and have a large influence on the visibility of the windshield glass, the driving safety, and the defogging performance.
Further, in step S5, specifically, the method includes: and (3) according to the performance evaluation indexes of the windshield defogging system under the driving working condition, processing and calculating the test data and the defogging area to obtain the comprehensive evaluation condition of each evaluation index, and judging the performance of the windshield defogging system under the driving working condition of the passenger vehicle according to the evaluation standard.
Further, the evaluation criteria are: the defogging area is 100% when the driver moves to cover the area 20 min; the demisting area is 100% when the passenger side wiper blade moves to cover the area for 25 min; the left outer rearview mirror and the right outer rearview mirror are completely seen for 10 min; the temperature of warm wind inlet water is more than or equal to 75 ℃ within 40 min; the temperature of the defrosting air outlet is more than or equal to 50 ℃ within 40 min.
Compared with the prior art, the invention has the beneficial effects that:
the invention discloses a real-vehicle test method for the performance of a passenger vehicle driving condition demisting system, and a sensor measurement value and a demisting area outline map are obtained through a data acquisition system and corresponding time period demisting trace drawing. Formulating performance evaluation indexes of the defogging system under the driving condition, processing and calculating the test process data and the defogging area to obtain the evaluation condition of each evaluation index, and judging the defogging performance of the defogging system for the windshield under the driving condition of the passenger vehicle; the practical vehicle test method of the passenger vehicle driving condition windshield defogging system provides important reference for researching passenger vehicle defogging system performance and developing an efficient defogging system.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic view of a mist generator;
FIG. 2 is a flow chart of a defogging system performance evaluation criteria evaluation method under a driving condition of a passenger vehicle;
FIG. 3 is a thinking diagram of a demisting system performance evaluation standard evaluation method under a driving condition of a passenger vehicle.
Detailed Description
The invention is further illustrated by the following examples:
the present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present invention, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
The invention relates to a demisting system performance evaluation standard evaluation method under the driving working condition of a passenger vehicle, which comprises the following steps:
s1, preparing and determining the state of a test sample vehicle, arranging a sensor on the test sample vehicle to be tested, debugging and preparing environmental chamber equipment, and carrying out precooling treatment and fog generation on the vehicle in a low-temperature environmental chamber;
s2, adjusting an air conditioning system of the vehicle to be tested, operating the low-temperature environment cabin equipment, and carrying out a driving defogging test under a preset working condition;
s3, collecting test data of the vehicle under test through a data acquisition system, and drawing defogging traces corresponding to time periods to obtain a sensor measurement value and a defogging area contour map;
s4, selecting an evaluation index, and formulating a passenger vehicle driving condition windshield defogging system performance evaluation standard according to a passenger vehicle driving condition windshield defogging system performance real vehicle test result and in combination with the vehicle actual use condition;
and S5, judging the performance of the windshield defogging system of the passenger vehicle under the driving condition based on the evaluation standard.
In step S1, sensors are disposed at the warm air inlet/outlet water, the defrosting outlet, and the front windshield of the vehicle under test. Specifically, the defrosting air outlet is arranged at the center of the end face of the hot air inlet, the center of the end face of the hot air outlet, the center of the end face of the defrosting air outlet and the outer surface of the windshield, wherein the position of the defrosting air outlet is inserted by 25 mm.
In step S3, the defogging area is calculated by using WinTopo and AutoCAD software, and the method specifically includes the following steps: firstly, opening WinTopo, converting a picture bitmap into a vector diagram, and introducing a parchment topological picture; carrying out image vectorization and storing the vector diagram; starting AutoCAD and opening the stored file; and performing demisting area calculation of each area through curve editing, capturing and face area creation.
In step S4, the evaluation indexes include a driver-side wiper blade movement coverage area, a passenger-side wiper blade movement coverage area, a left outer rear view mirror, a right outer rear view mirror defrosting area, a warm air intake temperature, and a defrosting air outlet temperature, and the six evaluation indexes are convenient for quantitative assessment and have a large influence on the visibility of the windshield glass, the driving safety, and the defrosting performance.
Step S5 specifically includes: and (3) according to the performance evaluation indexes of the windshield defogging system under the driving working condition, processing and calculating the test data and the defogging area to obtain the comprehensive evaluation condition of each evaluation index, and judging the performance of the windshield defogging system under the driving working condition of the passenger vehicle according to the evaluation standard.
Specifically, the evaluation criteria were: the defogging area is 100% when the driver moves to cover the area 20 min; the demisting area is 100% when the passenger side wiper blade moves to cover the area for 25 min; the left outer rearview mirror and the right outer rearview mirror are completely seen for 10 min; the temperature of warm wind inlet water is more than or equal to 75 ℃ within 40 min; the temperature of the defrosting air outlet is more than or equal to 50 ℃ within 40 min.
Examples
Sensors are arranged at the warm air inlet and outlet water, the defrosting air outlet and the front windshield of the tested vehicle, so that the temperature change condition of each measuring point in the driving defogging test process is monitored, and a reference basis is provided for evaluating and improving the defogging performance of the vehicle. The specific measurement points and positions are shown in table 1.
TABLE 1 measurement points and positions
The test is carried out in a low-temperature environment chamber provided with a chassis simulation dynamometer system, and before the test is started, the vehicle state is checked, and the integrity and the working effectiveness of the parts of the warm air system are confirmed. And fixing the test vehicle meeting the test conditions on the chassis dynamometer, setting the running resistance of the vehicle, and preparing to start the test.
Test method
1. Precooling stage
After the test vehicle enters the low-temperature environment cabin, the vehicle door, the window and the trunk are completely opened. And starting the low-temperature environment cabin equipment, setting the temperature of the low-temperature laboratory to be-15 ℃, and setting the wind speed of a fan of the environment cabin to be 50 km/h. After the temperature in the low-temperature test chamber reaches the set temperature, the vehicle is placed for at least 10 hours, or the temperature of the measuring points in the vehicle and on the surface of the windshield reaches-16 ℃ to-14 ℃ after the confirmation, the water temperature of the engine reaches balance, and the placing time can be shortened.
2. Stage of fog generation
The placing position of the mist generator is as follows: is positioned in the center of the cab, the air outlet of the air outlet is positioned on a plane 580mm +/-80 mm above the R point of the driver seat, and the R point position is determined according to GB 11555-2009. The specification of the fog generator for the test is the same as the performance and test method of a GB 11555-2009 automobile windshield defrosting and demisting system.
After the precooling stage is finished, the fog generator filled with at least 1.7L of water is heated to a boiling point to generate fog, after the fog is stable, the gas output of the fog generator is set according to the number n of passengers, namely n multiplied by 70g/h, the fog generator is put into a specified position in the vehicle as soon as possible, and the fog generation time is 10 min. The photograph of the mist generator is shown in detail in figure 1.
3. Test phase
After the fog generation stage is finished, testers (generally 2) rapidly enter the automobile, the automobile door, the window and the trunk are closed, and meanwhile, the air outlet quantity of the fog generator is reduced by 70g/h according to each tester entering the automobile. The automobile runs at a constant speed of 50km/h in a direct gear (no direct gear, gear with the speed ratio closest to 1) or a D gear, and simultaneously the running wind also follows the speed of the automobile. The air conditioner temperature regulating switch is arranged in a highest temperature mode, the circulation regulating switch is arranged in an external circulation mode, the air outlet regulating switch is arranged in a full-open and window-blowing mode, the air volume regulating switch is arranged in a maximum mode, and the air volume regulating switch runs for 40min at a constant speed. The specific test methods are shown in Table 2.
TABLE 2 test methods
Starting the IPETRONIK data acquisition system, starting to record all measurement parameters, and sampling for 1 time every 1 s. And simultaneously recording demisting traces of the front windshield glass and the left and right windshield glass, namely drawing a demisting area contour map on the inner surface of the windshield glass at a specified recording time. The recording time of the selected trace in the test method is 0min, 1min, 3min, 5min, 8min, 10min, 15min, 20min, 30min and 40min, and the picture is taken after each recording.
Evaluation index and evaluation standard
Selection of evaluation index
The method is characterized in that scientific and reasonable evaluation indexes are selected as the core and the root for evaluating the performance of the passenger vehicle driving condition defogging system, and six indexes, namely a driver side wiper blade movement coverage area, a secondary driver side wiper blade movement coverage area, a left outer rear view mirror, a right outer rear view mirror defrosting area, a warm air inlet temperature and a defrosting air outlet temperature, which are convenient for quantitative assessment and have large influences on the visibility of the windshield glass, the driving safety and the defogging performance, are selected as the evaluation indexes for the performance of the passenger vehicle driving condition defogging system according to domestic and foreign reference documents and conclusion and analysis conditions of a driving condition windshield glass defogging system performance test result.
And (4) marking the trace record condition of the driving working condition demisting test process under the condition that the whole demisting process is developed by using parchment paper after the test is finished. And calculating the demisting area in the evaluation index by utilizing WinTopo and AutoCAD software so as to judge the demisting capability of the vehicle under the driving working condition.
Evaluation criteria
According to the performance practical test result of the passenger vehicle driving working condition windshield defogging system, the performance evaluation standard of the passenger vehicle driving working condition defogging system is formulated by combining the actual use condition of the vehicle. The movement coverage area of the driver side wiper blade is required to be completely removed after 20min of the start of the test, the movement coverage area of the passenger side wiper blade is completely removed after 25min of the start of the test, and the outer rearview mirror can be completely seen after about 10min of the start of the test; the warm air inlet temperature is not less than 75 ℃ and the defrosting air outlet temperature is not less than 50 ℃ after the test is finished for 40 min. The specific evaluation criteria are shown in Table 3.
TABLE 3 evaluation criteria for defogging system performance under driving conditions
In practical case application, a demisting system performance test under the working condition of a passenger vehicle is carried out in a low-temperature environment cabin according to the test method in the table 2, and a sensor measurement value and a demisting area contour map are obtained through the data acquisition system and demisting trace drawing in a corresponding time period. And (3) according to the performance evaluation indexes of the defogging system under the driving condition, processing and calculating the test process data and the defogging area to obtain the comprehensive evaluation condition of each evaluation index, and judging the performance of the defogging system for the windshield under the driving condition of the passenger vehicle according to the evaluation standard in the table 3.
The invention relates to a real vehicle test method and an evaluation standard for demisting system performance under the running condition of a passenger vehicle. The defogging trace of corresponding time slot is described through the data acquisition system to obtain sensor measurement value and defogging area profile map, refers to driving condition defogging system performance evaluation index, processes the comprehensive evaluation condition that calculates each evaluation index to test process data and defogging area to this performance of judging passenger car driving condition windshield defogging system. So far, no published demisting system performance test method and evaluation standard for passenger vehicle driving conditions exist in China.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (7)
1. A demisting system performance evaluation standard evaluation method under a driving condition of a passenger vehicle is characterized by comprising the following steps:
s1, arranging a sensor on the tested sample vehicle, and carrying out precooling treatment and fog generation on the vehicle in a low-temperature environment cabin;
s2, adjusting an air conditioning system of the vehicle to be tested, operating the low-temperature environment cabin equipment, and carrying out a driving defogging test under a preset working condition;
s3, collecting test data of the vehicle under test through a data acquisition system, and drawing defogging traces corresponding to time periods to obtain a sensor measurement value and a defogging area contour map;
s4, selecting an evaluation index, and formulating a passenger vehicle driving condition windshield defogging system performance evaluation standard according to a passenger vehicle driving condition windshield defogging system performance real vehicle test result and in combination with the vehicle actual use condition;
and S5, judging the performance of the windshield defogging system of the passenger vehicle under the driving condition based on the evaluation standard.
2. The evaluation method for the evaluation criteria of the defogging system performance under the driving condition of the passenger vehicle as recited in claim 1, wherein: in step S1, sensors are disposed at the warm air inlet/outlet water, the defrosting outlet, and the front windshield of the vehicle under test.
3. The evaluation method for the evaluation criteria of the defogging system performance under the driving condition of the passenger vehicle as recited in claim 2, wherein: the sensors are arranged at the center of the end face of the hot air inlet, the center of the end face of the hot air outlet, the center of the end face of the defrosting air outlet and the outer surface of the windshield, wherein the position of the center of the end face of the defrosting air outlet is inserted by 25 mm.
4. The evaluation method for the evaluation criteria of the defogging system performance under the driving conditions of the passenger vehicle as recited in claim 1, wherein in the step S3, the calculation of the defogging area comprises the following steps: firstly, converting a picture bitmap into a vector diagram, and importing a parchment paper topological photo; carrying out image vectorization and storing the vector diagram; and opening the stored file, editing, capturing and creating a face area through a curve, and calculating the area of each demisting area.
5. The evaluation method for the evaluation criteria of the defogging system performance under the driving condition of the passenger vehicle as recited in claim 1, wherein: in step S4, the evaluation indexes include a driver-side wiper blade movement coverage area, a passenger-side wiper blade movement coverage area, a left outer rear view mirror, a right outer rear view mirror defrosting area, a warm air intake temperature, and a defrosting air outlet temperature, and the six evaluation indexes are convenient for quantitative assessment and have a large influence on the visibility of the windshield glass, the driving safety, and the defrosting performance.
6. The evaluation method for the evaluation criteria of the defogging system performance under the driving condition of the passenger vehicle as recited in claim 1, wherein the step S5 specifically comprises: and (3) according to the performance evaluation indexes of the windshield defogging system under the driving working condition, processing and calculating the test data and the defogging area to obtain the comprehensive evaluation condition of each evaluation index, and judging the performance of the windshield defogging system under the driving working condition of the passenger vehicle according to the evaluation standard.
7. The evaluation method for the evaluation criteria of the defogging system performance under the driving condition of the passenger vehicle as recited in claim 1, wherein the evaluation criteria are: the defogging area is 100% when the driver moves to cover the area 20 min; the demisting area is 100% when the passenger side wiper blade moves to cover the area for 25 min; the left outer rearview mirror and the right outer rearview mirror are completely seen for 10 min; the temperature of warm wind inlet water is more than or equal to 75 ℃ within 40 min; the temperature of the defrosting air outlet is more than or equal to 50 ℃ within 40 min.
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| CN114030418A (en) * | 2021-11-16 | 2022-02-11 | 中国第一汽车股份有限公司 | Automatic heating demisting system and method for exterior mirror and vehicle |
| CN114813165A (en) * | 2022-03-30 | 2022-07-29 | 中国第一汽车股份有限公司 | Finished automobile test method of automatic anti-fog/defogging system of passenger automobile |
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