CN112781892B - Method for verifying vehicle dynamic performance and air conditioner performance attenuation under simulated dust environment - Google Patents
Method for verifying vehicle dynamic performance and air conditioner performance attenuation under simulated dust environment Download PDFInfo
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- CN112781892B CN112781892B CN202110004742.1A CN202110004742A CN112781892B CN 112781892 B CN112781892 B CN 112781892B CN 202110004742 A CN202110004742 A CN 202110004742A CN 112781892 B CN112781892 B CN 112781892B
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
The invention discloses a method for verifying vehicle dynamic performance and air conditioner performance attenuation in a simulated dust environment, which comprises the following steps of: the method comprises the steps of sample vehicle state access inspection, replacement of an air conditioner filter element and an air filter element, confirmation of a test site and an environment state, confirmation of an initial state of a sample vehicle, accumulation of a sand and dust environment circulation working condition, confirmation of a final state of the sample vehicle, judgment standard and verification result judgment. The invention can verify the influence of the sand environment on the vehicle dynamic performance and the air conditioning performance attenuation.
Description
Technical Field
The invention belongs to the technical field of vehicle dust environment tests, and particularly relates to a method for verifying vehicle power performance and air conditioner performance attenuation in a simulated dust environment.
Background
In the northwest of China, in European and Asia continents, the climate is drought, the rainfall is less, the earth surface is loose, the vegetation is sparse, and the desert grassland and the desert are mainly used. In the weather of strong wind in winter and spring, sandy soil is wrapped and rolled into the air to form a sandy dust environment.
When the vehicle runs in a sand and dust environment, sand and dust enters the engine air filter from the air inlet system, is accumulated at the bottom of the air filter, and is partially attached to the surface of the air filter element. When the dust and sand sucked by the air filter are accumulated continuously, the air filter element is blocked, the air inflow of the engine is reduced, and the power performance of the engine is reduced due to insufficient air inflow. The air conditioner filter element adsorbs dust, the air inlet volume of the air conditioning system is insufficient, and the performance of the air conditioner is reduced. The vehicle dynamic performance and the air conditioning performance cannot meet the user use demand, causing user complaints.
In the vehicle design research and development process, the sand and dust environment working condition verification is still in an exploration stage, most verification focuses on the influence of sand and dust on the sealing performance of a vehicle cockpit, the attention degree of the sand and dust environment on the attenuation of the vehicle dynamic performance and the air conditioner performance is low, and a mature verification method is not formed. The test development conditions, the number of sample vehicles, the verification strength and the like are not specifically required, and the test result judgment standard is lacked.
Therefore, it is necessary to develop a new method for verifying the vehicle dynamic performance and the air conditioning performance degradation in the simulated dust environment.
Disclosure of Invention
The invention aims to provide a method for verifying the attenuation of the dynamic performance and the air conditioning performance of a vehicle in a simulated dust environment, which can verify the influence of the dust environment on the attenuation of the dynamic performance and the air conditioning performance of the vehicle.
The invention discloses a method for verifying vehicle dynamic performance and air conditioner performance attenuation in a simulated dust environment, which comprises the following steps of:
step 1, numbering K sample vehicles, namely M in sequence1,M2,…，Mi，…，MK；
Step 2, installing unused air filter cores and air conditioner filter cores on K sample cars, respectively weighing the air filter cores and the air conditioner filter cores, and M1,M2,…，Mi，…，MKThe weight of the air filter element corresponding to the sample car is respectively
M1,M2,…，Mi，…，MKThe weight of the air conditioner filter element corresponding to the sample car is respectively
Step 3, testing the acceleration time of each sample vehicle from the first speed to the second speed, repeating the test for W times, and recording the test time of each time, wherein the test time is respectively
If the maximum value of the relative deviation of the test data of the single vehicle W times exceeds a first preset value, testing the W groups again, and if the maximum value of the relative deviation of the test data of the single vehicle W times does not exceed the first preset value, solving
Average value of (2)
And averaging the values
As an initial value of acceleration time of the vehicle from the first speed to the second speed;
step 4, testing the acceleration time required by each sample vehicle from the third speed to the fourth speed, repeating the test for W times, and recording the test time of each time, wherein the test time is respectively
If the maximum value of the relative deviation of the test data of the single vehicle for W times exceeds a second preset value, testing the W groups again, and if the maximum value of the relative deviation of the test data of the single vehicle for W times does not exceed the second preset value, solving
Average value of (2)
And averaging the values
As an initial value of acceleration time of the vehicle from the third speed to the fourth speed;
and 5, after the vehicle is fully heated, setting the air conditioner temperature to be lowest in an idling state, and sequentially testing the maximum wind speeds of the air outlet of the air conditioner at all air outlet gears to be respectively
Q is the air volume grade of the air conditioner;
and 6, sequentially distributing the vehicles in the running sequence of the sand environment: the sample vehicles are numbered according to the serial numbers, and when 1 cycle is carried out, M1The vehicle is the first vehicle, M2,…，MKThe vehicles are sequentially arranged to the 2, 3, …, K position; on cycle 2, M1The car is turned to the final tail car, M2,…，MKThe cars are sequentially queued to 1, 2, 3, …,the K-1 position; the subsequent circulation is carried out in turn according to the mode;
step 7, testing the sample car under the sand environment simulation working condition;
step 8, when the mileage accumulation of the sand dust environment reaches a preset mileage value, weighing the air filter element of each sample car, wherein the weighing is respectively carried out
Weighing the air conditioner filter elements of each sample car respectively
Step 9, according to the condition requirement of the step 3, testing the acceleration time from the first speed to the second speed of each sample vehicle, wherein the obtained time is respectively
If the maximum value of the relative deviation of the test data of the single vehicle for W times exceeds a first preset value, testing the W groups again, and if the maximum value of the relative deviation of the test data of the single vehicle for W times does not exceed the first preset value, calculating
Average value of (2)
Step 10, according to the condition requirement of the step 4, testing the acceleration time from the third speed to the fourth speed of each sample vehicle, wherein the obtained time is respectively
If the maximum value of the relative deviation of the test data of the single vehicle for W times exceeds a second preset value, testing the W groups again, and if the maximum value of the relative deviation of the test data of the single vehicle for W times does not exceed the second preset value, calculating
Average value of (2)
Step 11, after the vehicle is fully heated, in an idling state, setting the air conditioner temperature to be the lowest, and sequentially testing the maximum wind speed of the air outlet of the air conditioner under each air outlet gear to be respectively
And 12, judging that the strong sand and dust environment influences the dynamic performance of the vehicle based on the test result.
The step 12 specifically includes:
when any one of the following conditions occurs, the vehicle is considered to be incapable of meeting the use requirement:
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further, the step 7 includes:
(7a) starting the vehicle, wherein the idling speed is more than 2min, the vehicle speed is lower than 80km/h, and the continuous running time is more than 0.5 h;
(7b) the sample car arrives at a sand environment simulation test field and is tested according to a preset sequence;
(7c) the round trip mileage per cycle is 8km, the round trip mileage per cycle is divided into 4 stages, and the mileage per stage is 2 km; the first stage is that the vehicle speed is 20 +/-5 km/h, and the following distance is 10 +/-5 m; in the 2 nd stage, the vehicle speed is 35 +/-5 km/h, and the following distance is 15 +/-5 m; in the 3 rd stage, the vehicle speed is 50 +/-5 km/h, and the following distance is 20 +/-5 m; in the 4 th stage, the vehicle speed is 65 +/-5 km/h, and the following distance is 25 +/-5 m;
(7d) the above cycle is repeated a number of times.
Further, in the step (7d), the total cycle number is 25 × K/(K-1), K is the number of actual sample vehicles, and the effective accumulated mileage of each sample vehicle in the sand and dust simulation environment is 200km respectively.
Further, in step 7, the dust environment generated by the running of the sample vehicle requires that the visibility is lower than 50m in the running process of the vehicle.
Further, in the step 7, when the sample car is located at the first car position, the driving mileage does not account for the effective accumulated mileage of the dust environment; and in the position other than the head vehicle, the driving mileage is counted into the effective accumulated mileage of the dust environment.
Further, the first speed is 0km/h, the second speed is 100km/h, the third speed is 60km/h, and the fourth speed is 120 km/h.
Further, W is 3 times.
Further, the test site and environmental conditions are required as follows:
the road is straight and the road surface is dry; when the sample car is tested for acceleration time, the ambient temperature is 30-40 ℃, and the sample car is in breeze or windless weather; the accumulated working condition mileage road surface of the sand-dust environment is a natural dirt road, and the relative air humidity is lower than 30 percent.
The invention has the following advantages: the influence of the dust environment on the attenuation of the vehicle dynamic performance and the air conditioning performance can be verified. The influence of the dust environment on the performance attenuation of the power system is quantitatively analyzed by weighing the change of the air filter element before and after the dust working condition. The influence of the dust environment on the performance attenuation of the air conditioning system is quantitatively analyzed by weighing the change of the air conditioning filter element before and after the dust working condition. The method is a quantitative test method for judging whether the vehicle runs in a strong sand environment and whether the power performance is attenuated or not by using the change of the acceleration time of the vehicle.
Drawings
FIG. 1 is a flowchart of the present embodiment;
fig. 2 is a schematic diagram of a running sequence of the vehicle in the dust environment in the present embodiment.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
As shown in fig. 1, a method for verifying vehicle dynamic performance and air conditioning performance attenuation in a simulated dust environment comprises the following steps:
step 1, confirming sample vehicles, numbering K sample vehicles, and sequentially numbering M1,M2,…，Mi，…，MK. The number of sample vehicles is controlled to be between 3 and 6. The following description will be given taking 6 sample cars as an example; the serial numbers of 6 sample vehicles are sequentially set as M1,M2,M3,M4,M5,M6. And running-in and maintenance are carried out on the selected sample car according to the requirements of the operating instruction.
And 2, carrying out initial state inspection on the 6 sample vehicles, wherein the inspection items comprise normal functions of a vehicle power transmission system, a chassis system, an electrical system, an air conditioning system and the like, and the abnormal functions which do not influence the normal running of the vehicle. Replacing the latest air filter element and the latest air conditioner filter element for 6 sample vehicles, and weighing the sample vehicles respectively; m1,M2,M3,M4,M5,M6The weight of the air filter element corresponding to the sample car is respectively
M1,M2,M3,M4,M5,M6The weight of the air conditioner filter element corresponding to the sample car is respectively
And 3, testing the acceleration time required by each sample vehicle from the first speed to the second speed, and repeating the test for W times, wherein in the embodiment, the first speed is 0km/h, the second speed is 100km/h, and W is 3 times. Record the time of each test, respectively
If the bicycle is tested for 3 timesWhen the maximum value of the relative deviation of the data exceeds the first preset value, in the embodiment, the first preset value is 5%, the 3 groups of tests are performed again, and if the maximum value of the relative deviation of the test data of the single vehicle for 3 times does not exceed the first preset value, the maximum value of the relative deviation of the test data is obtained
Average value of (2)
And averaging the values
As a sample vehicle MiInitial acceleration time values from 0km/h to 100 km/h.
And 4, testing the acceleration time required by each sample vehicle from the third speed to the fourth speed, and repeating the test for W times, wherein in the embodiment, the third speed is 60km/h, and the fourth speed is 120 km/h. W is 3 times, and each test time is recorded as
If the maximum value of the relative deviation of the test data of the single vehicle for 3 times exceeds the second preset value, in the embodiment, the second preset value is 5%, the 3 groups of tests are performed again, and if the maximum value of the relative deviation of the test data of the single vehicle for 3 times does not exceed the second preset value, the relative deviation is solved
Average value of (2)
And averaging the values
As a sample vehicle MiAn initial acceleration time value from 60km/h to 120 km/h;
and 5, after the vehicle is fully heated, setting the air conditioner temperature to be lowest in an idling state, and sequentially testing the maximum wind speeds of the air outlet of the air conditioner at all air outlet gears to be respectively
And Q is the air volume grade of the air conditioner.
The above steps 2 to 5 are steps of confirming the initial state of the sample car.
And 6, sequentially distributing the vehicles in the running sequence of the sand environment: the sample vehicles are numbered according to the serial numbers, and when 1 cycle is carried out, M1The first vehicle, M2,…，M6The vehicles are sequentially arranged to the 2, 3, … and 6 positions; on cycle 2, M1The car is turned to the final tail car, M2,…，M6The vehicles are sequentially arranged to 1, 2, 3, … and 5 positions; the subsequent circulation is carried out in turn according to the mode; see fig. 2.
Step 7, testing the sample car under the sand environment simulation working condition, specifically:
(7a) starting the vehicle, wherein the idling speed is more than 2min, the vehicle speed is lower than 80km/h, and the continuous running time is more than 0.5 h;
(7b) the sample car arrives at a sand environment simulation test field and is tested according to a preset sequence;
(7c) the round trip mileage per cycle is 8km, the round trip mileage per cycle is divided into 4 stages, and the mileage per stage is 2 km; the first stage is that the speed of the vehicle is 20 +/-5 km/h, and the distance between the vehicles is 10 +/-5 m; in the 2 nd stage, the vehicle speed is 35 +/-5 km/h, and the following distance is 15 +/-5 m; in the 3 rd stage, the vehicle speed is 50 +/-5 km/h, and the following distance is 20 +/-5 m; in the 4 th stage, the vehicle speed is 65 +/-5 km/h, and the following distance is 25 +/-5 m;
(7d) and repeating the circulation, wherein the total circulation frequency is 25K/(K-1), K is the number of the actual sample vehicles, and the effective accumulated mileage of each sample vehicle in the sand dust simulation environment is 200km respectively.
The sand and dust environment generated by the running of the sample vehicle requires that the visibility is lower than 50m in the running process of the vehicle.
When the sample car is positioned at the first car position, the driving mileage does not account for the effective accumulated mileage of the dust environment; and in the position other than the head vehicle, the driving mileage is counted into the effective accumulated mileage of the dust environment.
Step 8, after the mileage accumulation of the sand dust environment reaches a preset mileage value, weighing the air filter element of each sample car, and M1,M2,M3,M4,M5,M6The weight of the air filter element corresponding to the sample car is respectively
Weighing the air-conditioning filter element of each sample car, M1,M2,M3,M4,M5,M6The weight of the air conditioner filter element corresponding to the sample car is respectively
And 9, retesting the acceleration time of 0-100km/h of each sample car according to the condition requirement of the step 3. Each sample car is tested for three times repeatedly, and the time is respectively
And if the maximum value of the relative deviation of the test data of the single vehicle for three times exceeds 5%, carrying out three groups of tests again. If the maximum value of the relative deviation of the three test data of the single vehicle does not exceed 5 percent, calculating
Average value of (2)
And 10, retesting the acceleration time of 60-120km/h of each sample car according to the condition requirement of the step 4. Each sample car is tested for three times repeatedly, and the time is respectively
And if the maximum value of the relative deviation of the test data of the single vehicle for three times exceeds 5%, carrying out three groups of tests again. If the maximum value of the relative deviation of the three test data of the single vehicle does not exceed 5 percent, calculating
Average value of (2)
Step 11, after the vehicle is fully heated, in an idling state, the air conditioner temperature is set to be the lowest, and the maximum wind speed of the air outlet of the air conditioner is respectively tested to be the lowest under each air outlet gear
The above steps 10 to 11 are steps of confirming the final state of the sample vehicle.
Step 12, judging that the strong dust environment affects the vehicle dynamic performance based on the test result, wherein the judgment standard and the verification result in the embodiment specifically comprise: through above-mentioned verification operating mode, when appearing in following several kinds of condition arbitrary, then judge that strong dust and sand environment influences vehicle dynamic performance, can't satisfy user's user demand:
firstly, the weight of the filter element of the air filter changes:
secondly, the weight of the air conditioner filter element is changed:
(iii) relative change of 0-100km/h acceleration time:
fourthly, relative change of acceleration time of 60-120 km/h:
the relative change of the wind speed of the air conditioner under each gear:
in this embodiment, the test site and the environmental conditions are as follows:
the road is straight and the road surface is dry; when the sample car is tested for acceleration time, the ambient temperature is between 30 and 40 ℃, and the sample car is in breeze or windless weather; the accumulated working condition mileage road surface of the sand-dust environment is a natural dirt road, and the relative air humidity is lower than 30 percent.
When the acceleration time of the sample car is tested, the fuel oil of the sample car is full, the anti-freezing solution is filled into the upper scale mark, and no other tool or equipment for increasing the load of the car is provided except necessary safety equipment such as a fire extinguisher and the like in the car.
Claims (8)
1. A method for verifying vehicle dynamic performance and air conditioner performance attenuation under a simulated dust environment is characterized in that: the method comprises the following steps:
step 1, numbering K sample vehicles, namely M in sequence1,M2,...，Mi，...，MK；
Step 2, installing unused air filter cores and air conditioner filter cores on K sample cars, respectively weighing the air filter cores and the air conditioner filter cores, and M1,M2,...，Mi，...，MKThe weight of the air filter element corresponding to the sample car is respectively
M1,M2,...，Mi，...，MKThe weight of the air conditioner filter element corresponding to the sample car is respectively
Step 3, testing the acceleration time of each sample vehicle from the first speed to the second speed, repeating the test for W times, and recording the test time of each time, wherein the test time is respectively
If the maximum value of the relative deviation of the test data of the single vehicle W times exceeds a first preset value, testing the W groups again, and if the maximum value of the relative deviation of the test data of the single vehicle W times does not exceed the first preset value, solving
Average value of (2)
And averaging the values
As an initial value of acceleration time of the vehicle from the first speed to the second speed;
step 4, testing the acceleration time required by each sample vehicle from the third speed to the fourth speed, repeating the test for W times, and recording the test time of each time, wherein the test time is respectively
If the maximum value of the relative deviation of the test data of the single vehicle for W times exceeds a second preset value, testing the W groups again, and if the maximum value of the relative deviation of the test data of the single vehicle for W times does not exceed the second preset value, solving
Average value of (2)
And averaging the values
As an initial value of acceleration time of the vehicle from the third speed to the fourth speed;
and 5, after the vehicle is fully heated, setting the air conditioner temperature to be lowest in an idling state, and sequentially testing the maximum wind speeds of the air outlet of the air conditioner at all air outlet gears to be respectively
Q is the air volume grade of the air conditioner;
and 6, sequentially distributing the vehicles in the running sequence of the sand environment: the sample vehicles are numbered according to the serial numbers, and when 1 cycle is carried out, M1The vehicle is the first vehicle, M2,...，MKThe vehicles are sequentially arranged to the 2, 3, …, K position; on cycle 2, M1The car is turned to the final tail car, M2,...，MKThe vehicles are sequentially arranged to the positions of 1, 2, 3, … and K-1; subsequent cycle is as followsThe above modes are carried out in sequence;
step 7, testing the sample car under the sand environment simulation working condition;
step 8, when the mileage accumulation of the sand dust environment reaches a preset mileage value, weighing the air filter element of each sample car, wherein the weighing is respectively carried out
Weighing air conditioner filter elements of each sample car respectively
Step 9, according to the condition requirement of the step 3, testing the acceleration time from the first speed to the second speed of each sample vehicle, wherein the obtained time is respectively
If the maximum value of the relative deviation of the test data of the single vehicle for W times exceeds a first preset value, testing the W groups again, and if the maximum value of the relative deviation of the test data of the single vehicle for W times does not exceed the first preset value, calculating
Average value of (2)
Step 10, according to the condition requirement of the step 4, testing the acceleration time from the third speed to the fourth speed of each sample vehicle, wherein the obtained time is respectively
If the maximum value of the relative deviation of the test data of the single vehicle for W times exceeds a second preset value, testing the W groups again, and if the maximum value of the relative deviation of the test data of the single vehicle for W times does not exceed the second preset value, calculating
Average of (2)Value of
Step 11, after the vehicle is fully heated, in an idling state, setting the air conditioner temperature to be the lowest, and sequentially testing the maximum wind speed of the air outlet of the air conditioner under each air outlet gear to be respectively
Step 12, judging that the strong sand environment influences the vehicle dynamic performance based on the test result, specifically:
when any one of the following conditions occurs, the vehicle is considered to be incapable of meeting the use requirement:
①
②
③
④
⑤
2. the method of verifying vehicle dynamics and degradation of air conditioning performance in a simulated dust and sand environment of claim 1, wherein: the step 7 includes:
(7a) starting the vehicle, wherein the idling speed is more than 2min, the vehicle speed is lower than 80km/h, and the continuous running time is more than 0.5 h;
(7b) the sample car arrives at a sand environment simulation test field and is tested according to a preset sequence;
(7c) the round trip mileage per cycle is 8km, the round trip mileage per cycle is divided into 4 stages, and the mileage per stage is 2 km; the first stage is that the vehicle speed is 20 +/-5 km/h, and the following distance is 10 +/-5 m; in the 2 nd stage, the vehicle speed is 35 +/-5 km/h, and the following distance is 15 +/-5 m; in the 3 rd stage, the vehicle speed is 50 +/-5 km/h, and the following distance is 20 +/-5 m; in the 4 th stage, the vehicle speed is 65 +/-5 km/h, and the following distance is 25 +/-5 m;
(7d) the above cycle is repeated a number of times.
3. The method of verifying vehicle dynamics and degradation of air conditioning performance in a simulated dust and sand environment of claim 2, wherein: in the step (7d), the total cycle number is 25 x K/(K-1), K is the number of actual sample vehicles, and the effective accumulated mileage of each sample vehicle in the sand and dust simulation environment is 200km respectively.
4. The method of verifying vehicle dynamics and degradation of air conditioning performance in a simulated dust and sand environment of claim 3, wherein: in the step 7, the dust environment generated by the running of the sample vehicle requires that the visibility is lower than 50m in the running process of the vehicle.
5. The method of verifying vehicle dynamics and degradation of air conditioning performance in a simulated dust and sand environment of claim 4, wherein: in the step 7, when the sample car is positioned at the head car position, the driving mileage is not counted into the effective accumulated mileage of the dust environment; and in the position other than the head vehicle, the driving mileage is counted into the effective accumulated mileage of the dust environment.
6. The method for verifying vehicle dynamic performance and air conditioning performance degradation in a simulated dust and sand environment of any of claims 1 to 5, wherein: the first speed is 0km/h, the second speed is 100km/h, the third speed is 60km/h and the fourth speed is 120 km/h.
7. The method of verifying vehicle dynamics and degradation of air conditioning performance in a simulated dust and sand environment of claim 6, wherein: w is 3 times.
8. A method of verifying vehicle dynamics and air conditioning performance degradation in a simulated dusty environment according to claim 1 or 2 or 3 or 4 or 5 or 7, characterized by: the test site and environmental conditions were as follows:
the road is straight and the road surface is dry; when the sample car is tested for acceleration time, the ambient temperature is 30-40 ℃, and the sample car is in breeze or windless weather; the accumulated working condition mileage road surface of the sand-dust environment is a natural dirt road, and the relative air humidity is lower than 30 percent.
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