CN109238740A - A kind of automobile slide resistance integrated evaluating method based on complete vehicle quality and volume - Google Patents
A kind of automobile slide resistance integrated evaluating method based on complete vehicle quality and volume Download PDFInfo
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- CN109238740A CN109238740A CN201811003280.6A CN201811003280A CN109238740A CN 109238740 A CN109238740 A CN 109238740A CN 201811003280 A CN201811003280 A CN 201811003280A CN 109238740 A CN109238740 A CN 109238740A
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- resistance
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/13—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring the tractive or propulsive power of vehicles
Abstract
The invention discloses a kind of automobile slide resistance test methods, comprising the following steps: step A: establishing database, records the test mass M and vehicle volume Q of sample vehicle；Step B: according to the relationship of pre-set resistance of taxing and test mass M and vehicle volume Q, the resistance of taxing of the vehicle to be measured is obtained；Step C: according to the relationship of the resistance of taxing of each vehicle to be measured of step B and test mass M and vehicle volume Q, corresponding average resistance of taxing in database is obtained；Step D: according to the practical resistance of taxing of the vehicle to be measured average resistance of taxing corresponding with the database, the standard deviation of resistance of taxing difference is obtained；Step E: it is standardized according to the standard variance.Compared with prior art, the accurate representation of the present invention resistance levels of the vehicle, rational evaluation resistance of taxing are horizontal.
Description
Technical field
The present invention relates to vehicle performance factor the field of test technology, especially a kind of automobile based on complete vehicle quality and volume
Resistance of taxing integrated evaluating method.
Background technique
Automobile slide resistance reflects the transmission system of chassis and shape-designing level of vehicle, needs in vehicle R&D process
It carries out more wheels and slides resistance test, for analyzing the change of chassis system component, design parameter, vehicle modeling optimization to improvement vehicle
The influence of running resistance finally combines power system performance parameters simulation to calculate vehicle performance index, and makes to research and development vehicle
Reasonable market orientation.Therefore, accurate, reasonable, comprehensive evaluation vehicle sliding resistance, is conducive to the design of vehicle R&D process
Goal-setting with reach, for marketing unit accurate market orientation data are provided.
The test method of automobile slide resistance in the prior art is mainly the line constructed with complete vehicle quality and resistance of taxing
Property equation, using test mass as abscissa, resistance of taxing be ordinate draw comparison diagram.Linear function fitting data is used simultaneously
The quality of homology vehicle-resistance of taxing relation curve in library, when quality-resistance of taxing data point of comparison vehicle is located at data
When below the linearity curve of library, illustrate the vehicle resistance better than database average level；When quality-resistance of taxing number of comparison vehicle
When strong point is located above database linearity curve, illustrate that the vehicle resistance is inferior to database average level.
Current road resistance of taxing evaluation method has the following problems:
1., resistance of taxing be the sum of rolling resistance and air drag, rolling resistance influence factor includes complete vehicle quality and rolling
Dynamic resistance coefficient, air drag factor to affect are mainly vehicle moulding.The linear equation constructed with complete vehicle quality and resistance of taxing
Evaluation method cannot reflect the true horizon of vehicle resistance completely；
2., with the continuous development of vehicle Lightweight Technology, complete vehicle quality and the ratio of interior space (vehicle volume) be in
Downward trend.The variation tendency of complete vehicle quality and vehicle resistance variation tendency are inconsistent.The space of vehicle constantly increases, but whole
Vehicle quality does not accordingly increase, or even downward trend occurs；
3. client is selecting private while with the improvement of living standards, demand of the consumer to vehicle space constantly increases
Family's vehicle is usually using space, oil consumption, accelerating ability in vehicle storehouse as the main indicator considered on an equal basis.
Summary of the invention
The object of the present invention is to provide a kind of automobile slide resistance integrated evaluating method based on complete vehicle quality and volume, with
Deficiency in the prior art is solved, it can be by vehicle volume as one of vehicle sliding resistance Appreciation gist, in conjunction with vehicle matter
Amount comprehensively, reasonably evaluate to resistance of taxing.
The present invention provides a kind of automobile slide resistance test methods, comprising the following steps:
Step A: establishing database, records the test mass M and vehicle volume Q of sample vehicle；
Step B: it according to the relationship of pre-set resistance of taxing and test mass M and vehicle volume Q, obtains described to be measured
The resistance of taxing of vehicle；
Step C: it according to the relationship of the resistance of taxing of each vehicle to be measured of step B and test mass M and vehicle volume Q, obtains
Take corresponding average resistance of taxing in database；
Step D: according to the practical resistance of taxing of the vehicle to be measured average resistance of taxing corresponding with the database,
Obtain the standard deviation of resistance of taxing difference；
Step E: it is standardized according to the standard variance.
Automobile slide resistance integrated evaluating method based on complete vehicle quality and volume as described above, wherein preferably,
In the step B, comprising the following steps:
Step B1:
According to the following formula, each sample vehicle is obtained in the resistance of taxing F of set speed point Vroad,
Froad=F0+F1×V+F2×V2
Wherein, F0、F1And F2It is Coasting resistance coefficient；
Step B2:
By following formula, a value and b value of each sample vehicle is calculated:
Froad=a+b × V2
Wherein a represents rolling resistance Ff, b is coefficient of air resistance.
Automobile slide resistance integrated evaluating method based on complete vehicle quality and volume as described above, wherein preferably,
In the step C, comprising the following steps:
Step C1:
According to the following formula, equation coefficient P is calculated0:
Ff=P0×M；
Step C2:
According to the following formula, each vehicle to be measured corresponding air drag F in set speed point V is calculatedW:
Fw=b × V2；
Step C3:
According to the following formula, equation coefficient k is calculated0:
Fw=k0×Q；
Step C4:
According to the following formula, database is calculated to be averaged resistance of taxing Froad':
Froad'=P0×M+k0×Q。
Automobile slide resistance integrated evaluating method based on complete vehicle quality and volume as described above, wherein preferably,
In the step D, pass through Froad-Froad' obtain the practical resistance of taxing of the vehicle to be measured and database resistance of taxing average level
Difference, the standard deviation of resistance of taxing differenceroad。
Automobile slide resistance integrated evaluating method based on complete vehicle quality and volume as described above, wherein preferably,
In the step E, using following formula to resistance of taxing FroadIt is standardized:
Automobile slide resistance integrated evaluating method based on complete vehicle quality and volume as described above, wherein preferably,
Further include step F: obtaining TroadStandardized normal distribution probability Proad, according to standardized normal distribution probability ProadCarry out from it is small to
Longer spread determines the ranking of each car.
Automobile slide resistance integrated evaluating method based on complete vehicle quality and volume as described above, wherein preferably,
Set speed point V is 30km/h, 60km/h, 90km/h or 120km/h.
Compared with prior art, the present invention establishes examination by the way that resistance of taxing is divided into rolling resistance and air drag respectively
The dependent equation of the amount of checking the quality and rolling resistance, vehicle volume and air drag, and normal distribution probability algorithm is used, it respectively obtains
The rolling resistance of each sample vehicle of database, the distributing position of air drag in the database, the accurate representation resistance of the vehicle
Power is horizontal, and rational evaluation resistance of taxing is horizontal.
Detailed description of the invention
Fig. 1 is flow diagram of the invention；
Fig. 2 is the operating process schematic diagram of embodiment one；
Fig. 3 is the fitting result schematic diagram in embodiment one in step 3；
Fig. 4 is the fitting result schematic diagram in embodiment one in step 4.
Specific embodiment
The embodiments described below with reference to the accompanying drawings are exemplary, for explaining only the invention, and cannot be construed to
Limitation of the present invention.
As shown in Figure 1, the present invention provides a kind of automobile slide resistance test methods, comprising the following steps:
Step A: establishing database, records the test mass M and vehicle volume Q of sample vehicle；
Step B: it according to the relationship of pre-set resistance of taxing and test mass M and vehicle volume Q, obtains described to be measured
The resistance of taxing of vehicle；
Step C: it according to the relationship of the resistance of taxing of each vehicle to be measured of step B and test mass M and vehicle volume Q, obtains
Take corresponding average resistance of taxing in database；
Step D: according to the practical resistance of taxing of the vehicle to be measured average resistance of taxing corresponding with the database,
Obtain the standard deviation of resistance of taxing difference；
Step E: it is standardized according to the standard variance.
Further, in the step B, comprising the following steps:
Step B1:
According to the following formula, each sample vehicle is obtained in the resistance of taxing F of set speed point Vroad,
Froad=F0+F1×V+F2×V2
Wherein, F0、F1And F2It is Coasting resistance coefficient；
Step B2:
By following formula, a value and b value of each sample vehicle is calculated:
Froad=a+b × V2
Wherein a represents rolling resistance Ff, b is coefficient of air resistance.
Further, in the step C, comprising the following steps:
Step C1:
According to the following formula, equation coefficient P is calculated0:
Ff=P0×M；
Step C2:
According to the following formula, each vehicle to be measured corresponding air drag F in set speed point V is calculatedW:
Fw=b × V2；
Step C3:
According to the following formula, equation coefficient k is calculated0:
Fw=k0×Q；
Step C4:
According to the following formula, database is calculated to be averaged resistance of taxing Froad':
Froad'=P0×M+k0×Q。
Further, in the step D, pass through Froad-Froad' obtain the practical resistance of taxing of the vehicle to be measured and data
The difference of library resistance of taxing average level, the standard deviation of resistance of taxing differenceroad。
Further, in the step E, using following formula to resistance of taxing FroadIt is standardized:
Further, further include step F: obtaining TroadStandardized normal distribution probability Proad, general according to standardized normal distribution
Rate ProadIt is arranged from small to large, determines the ranking of each car.
Further, set speed point V is 30km/h, 60km/h, 90km/h or 120km/h.
Embodiment one:
As shown in Fig. 2, the embodiment of the invention provides a kind of based on complete vehicle quality and the automobile slide resistance of volume synthesis
Evaluation method, comprising the following steps:
Step 1: referring to GB/T 12536 " automobile slide test method " and GB 18352.5-2013 " light-duty vehicle pollution
Object emission limit and test method " testing standard, establish resistance of taxing database, in the present embodiment, as shown in Table 1, record
Sample vehicle title, test mass M, vehicle volume Q, Coasting resistance coefficient F0, Coasting resistance coefficient F1, Coasting resistance coefficient F2,
The wherein correspondence Coasting resistance coefficient F of each sample vehicle0, Coasting resistance coefficient F1, Coasting resistance coefficient F2It can be in above-mentioned mark
It is found in standard, test mass M unit is kg, and vehicle volume Q unit is m3。
Table one
Step 2: each sample vehicle is calculated in the resistance of taxing F of set speed point V according to formula (1)road,
Froad=F0+F1×V+F2×V2 (1)
In the present embodiment, by taking first vehicle as an example, the resistance of taxing F under each set speed point is calculatedroad, calculated result such as table
Shown in two,
Table two
Step 3:
By resistance of taxing FroadWith set speed point V, each sample vehicle in formula (2) is calculated using least square method
A value and b value, wherein a represents rolling resistance Ff, b is coefficient of air resistance,
Froad=a+b × V2 (2)
In the present embodiment, a value and b of each sample vehicle at set speed point 120km/h in database are successively calculated
Value, data result is as shown in Table 3,
Table three
Step 4:
As shown in figure 3, using the test mass M of each car in resistance of taxing database as abscissa, with its corresponding rolling
Resistance FfAs ordinate, system of linear equations is established, obtains formula (3), the equation coefficient P being fitted0,
Ff=P0×M (3)
In the present embodiment, the equation coefficient P of each sample vehicle in database is successively calculated0Value, data result such as table four
It is shown,
Table four
Step 5:
At set speed point 120km/h, by coefficient of air resistance b and set speed point V, substitutes into formula (4), calculate
To each sample vehicle in set speed point V corresponding air drag FW,
Fw=b × V2 (4)
Step 6:
As shown in figure 4, when set speed point V, with the air drag F of each car in resistance of taxing databaseWWith vehicle body
Product Q, establishes system of linear equations, obtains formula (5), the equation coefficient k being fitted0,
Fw=k0×Q (5)
In the present embodiment, system of equations of each sample vehicle at set speed point 120km/h in database is successively calculated
Number P0Value, data result is as shown in Table 5,
Table five
Step 7:
The equation coefficient P obtained based on step 4 and step 60And K0Following formula (6) are constructed, it is corresponding to substitute into each sample
Test mass M, vehicle volume Q, the database that the sample vehicle is calculated is averaged resistance of taxing Froad′,
Froad'=P0×M+k0×Q (6)
In the present embodiment, under the set speed point of 120km/h, the practical resistance of taxing F that is calculatedroadAnd database
Average resistance of taxing Froad', as shown in Table 5,
Table six
Step 8:
Calculate Froad-Froad' obtain the difference of the practical resistance of taxing of sample vehicle and database resistance of taxing average level
Value calculates the standard deviation of resistance of taxing differenceroad；
In the present embodiment, under the set speed point of 120km/h, standard deviation is calculatedroad, as shown in Table 7,
Table seven
Step 9:
Using formula (7) to resistance of taxing FroadIt is standardized,
In the present embodiment, under the set speed point of 120km/h, T is calculatedroad, as shown in Table 8,
Table eight
Step 10:
Calculate TroadStandardized normal distribution probability Proad, within the scope of the corresponding 0-100% of each sample vehicle of database
Normal distribution probability value.ProadIndicate sample resistance of taxing FroadDatabase is distributed in be averaged resistance of taxing Froad' two sides σroad
Probability in range represents the level distribution of the vehicle in the database, and the value is bigger, and its resistance of taxing that represents is relatively higher, slides
Resistance levels are relatively poor.
In the present embodiment, under the set speed point of 120km/h, T is calculatedroad, as shown in Table 9,
Table nine
Above-described embodiment is by being divided into rolling resistance and air drag for resistance of taxing, establishing test mass respectively and rolling
The dependent equation of resistance, vehicle volume and air drag, and normal distribution probability algorithm is used, respectively obtain each sample of database
The rolling resistance of vehicle, the distributing position of air drag in the database, the accurate representation resistance levels of the vehicle, are rationally commented
Valence resistance of taxing is horizontal.
Resistance of taxing evaluation method of the invention is suitable for whole passenger cars and commercial vehicle.Commercial vehicle resistance of taxing equally by
Rolling resistance and air drag composition, rolling resistance and complete vehicle quality are there are linear relationship, and the volume of commercial vehicle and loading
(visitor) amount is directly related, is one of most important factor in need of consideration when commercial vehicle client chooses, therefore evaluate described in this method
Method is equally applicable to commercial vehicle.
Resistance of taxing evaluation method of the invention considers influence of the development of automotive light weight technology technology to resistance of taxing and becomes
Gesture establishes comprehensive vehicle sliding resistance quantization comparative analysis side in combination with market for the demand trend of vehicle space
Method.It can clearly reflect that test vehicle is in the distributing position of market homotype product.Evaluation method is slided according to database
Resistance versus evaluation calculates, and can directly reflect structure design, the vehicle resistance levels of test vehicle.
It further, further include having step 11: according to standardized normal distribution probability ProadIt is arranged from small to large, really
Determine the ranking of each car, ranking is smaller, then ranking is forward, then resistance levels are higher.Selection matrix data processing software Matlab
The foundation and data evaluation for carrying out database calculate, the data contents such as the writable character of mat formatted data file, numerical value, and
Mat text can construct hierarchical data structure, realize that vehicle carries out database grooming classification according to vehicle system, vehicle.
Shown in score basis following content:
1)1≤Proad< 0.9, make 6 scores；
2)0.9≤Proad< 0.8, make 6.5 scores；
3)0.8≤Proad< 0.7, make 7 scores；
4)0.7≤Proad< 0.6, make 7.5 scores；
5)0.6≤Proad< 0.5, make 8 scores；
6)0.5≤Proad< 0.4, make 8.5 scores；
7)0.4≤Proad< 0.3, make 8.5 scores；
8)0.3≤Proad< 0.2, make 9 scores；
9)0.2≤Proad< 0.1, make 9.5 scores；
10)0.1≤Proad< 0, make 10 scores.
Further, set speed point V is 30km/h, 60km/h, 90km/h or 120km/h.
Structure, feature and effect of the invention, the above institute are described in detail based on the embodiments shown in the drawings
Only presently preferred embodiments of the present invention is stated, but the present invention does not limit the scope of implementation as shown in the drawings, it is all according to structure of the invention
Think made change or equivalent example modified to equivalent change, when not going beyond the spirit of the description and the drawings,
It should all be within the scope of the present invention.
Claims (7)
1. a kind of automobile slide resistance test method, which comprises the following steps:
Step A: establishing database, records the test mass M and vehicle volume Q of sample vehicle；
Step B: according to the relationship of pre-set resistance of taxing and test mass M and vehicle volume Q, the vehicle to be measured is obtained
Resistance of taxing；
Step C: according to the relationship of the resistance of taxing of each vehicle to be measured of step B and test mass M and vehicle volume Q, number is obtained
According to average resistance of taxing corresponding in library；
Step D: it according to the practical resistance of taxing of the vehicle to be measured average resistance of taxing corresponding with the database, obtains
The standard deviation of resistance of taxing difference；
Step E: it is standardized according to the standard variance.
2. automobile slide resistance test method according to claim 1, which is characterized in that
In the step B, comprising the following steps:
Step B1:
According to the following formula, each sample vehicle is obtained in the resistance of taxing F of set speed point Vroad,
Froad=F0+F1×V+F2×V2
Wherein, F0、F1And F2It is Coasting resistance coefficient；
Step B2:
By following formula, a value and b value of each sample vehicle is calculated:
Froad=a+b × V2
Wherein a represents rolling resistance Ff, b is coefficient of air resistance.
3. automobile slide resistance test method according to claim 2, which is characterized in that
In the step C, comprising the following steps:
Step C1:
According to the following formula, equation coefficient P is calculated0:
Ff=P0×M；
Step C2:
According to the following formula, each vehicle to be measured corresponding air drag F in set speed point V is calculatedW:
Fw=b × V2；
Step C3:
According to the following formula, equation coefficient k is calculated0:
Fw=k0×Q；
Step C4:
According to the following formula, database is calculated to be averaged resistance of taxing Froad':
Froad'=P0×M+k0×Q。
4. automobile slide resistance test method according to claim 3, which is characterized in that
In the step D, pass through Froad-Froad' to obtain the practical resistance of taxing of the vehicle to be measured and database resistance of taxing average
Horizontal difference, the standard deviation of resistance of taxing differenceroad。
5. automobile slide resistance test method according to claim 4, which is characterized in that
In the step E, using following formula to resistance of taxing FroadIt is standardized:
6. automobile slide resistance test method according to claim 5, which is characterized in that
Further include step F: obtaining TroadStandardized normal distribution probability Proad, according to standardized normal distribution probability ProadCarry out from
It is small to arrive longer spread, determine the ranking of each car.
7. according to the described in any item automobile slide resistance test methods of claim 2-6, it is characterised in that: set speed point V
For 30km/h, 60km/h, 90km/h or 120km/h.
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| CN113280968A (en) * | 2021-05-08 | 2021-08-20 | 安徽江淮汽车集团股份有限公司 | Vehicle friction plate dragging torque test method, distribution diagram test method and device |
| CN113654809A (en) * | 2021-07-27 | 2021-11-16 | 河南德力新能源汽车有限公司 | Method for measuring actual sliding resistance coefficient of electric automobile by using VBOX equipment |
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