CN113281058A - Vehicle rolling resistance testing method - Google Patents
Vehicle rolling resistance testing method Download PDFInfo
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- CN113281058A CN113281058A CN202110495241.8A CN202110495241A CN113281058A CN 113281058 A CN113281058 A CN 113281058A CN 202110495241 A CN202110495241 A CN 202110495241A CN 113281058 A CN113281058 A CN 113281058A
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- 238000005096 rolling process Methods 0.000 title claims abstract description 125
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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
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- G—PHYSICS
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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
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Abstract
The invention provides a vehicle rolling resistance testing method, which comprises the following steps: respectively acquiring two groups of finished automobile internal resistances corresponding to the test automobile when the test automobile loads two groups of different axle loads in a finished automobile internal resistance sliding test state; respectively acquiring an axle load difference value and a rolling resistance difference value according to the two sets of axle loads and the two sets of internal resistances of the whole vehicle; calculating and obtaining rolling resistance coefficients of tires of the test vehicle under different vehicle speeds according to the axle load difference value and the rolling resistance difference value; and calculating according to the rolling resistance coefficient to obtain the rolling resistance of the whole vehicle at different speeds. The vehicle rolling resistance testing method provided by the invention is simple and convenient to operate, and can effectively improve the rolling resistance coefficient and the rolling resistance measuring precision.
Description
Technical Field
The invention relates to the technical field of rolling resistance testing, in particular to a vehicle rolling resistance testing method.
Background
In the prior art, when testing the rolling resistance of a tire, a transmission shaft and a brake pad need to be removed, the anti-drag resistance is obtained by reversely dragging the tire by a rotating hub, the internal resistance of the rotating hub is obtained by a no-load test, and then the internal resistance of the rotating hub is subtracted by the anti-drag resistance, so that the rolling internal resistance of the tire is obtained. The test method in the prior art is not only complex in operation, but also low in measured rolling resistance precision.
Disclosure of Invention
The invention provides a vehicle rolling resistance testing method, which is used for solving the problems of complex operation and low testing precision of the rolling resistance testing method in the prior art and effectively improving the testing precision of the rolling resistance of the whole vehicle.
The invention provides a vehicle rolling resistance testing method, which comprises the following steps:
respectively acquiring two groups of finished automobile internal resistances corresponding to the test automobile when the test automobile loads two groups of different axle loads in a finished automobile internal resistance sliding test state;
respectively acquiring an axle load difference value and a rolling resistance difference value according to the two sets of axle loads and the two sets of internal resistances of the whole vehicle;
calculating and obtaining rolling resistance coefficients of tires of the test vehicle under different vehicle speeds according to the axle load difference value and the rolling resistance difference value;
and calculating according to the rolling resistance coefficient to obtain the rolling resistance of the whole vehicle at different speeds.
According to the vehicle rolling resistance testing method provided by the invention, in a whole vehicle internal resistance sliding testing state of a testing vehicle, two groups of whole vehicle internal resistances corresponding to the testing vehicle when two groups of different axle loads are loaded are respectively obtained, and the method specifically comprises the following steps:
acquiring a first axle load value M1 of the test vehicle;
after the test vehicle is preheated for the first time and is in a first vehicle internal resistance sliding mode, obtaining a first vehicle internal resistance curve coefficient A1 (N/kph) at a first axle load value M1 according to the measurement of the rotating hub2) B1(N/kph) and C1(N), and calculating to obtain a first vehicle internal resistance F1 according to the first vehicle internal resistance curve coefficient; the first whole vehicle internal resistance sliding mode is that the speed of a test vehicle is accelerated to a first preset value and neutral gear sliding is carried out;
after the test vehicle is kept still for a preset time, the test vehicle is set to be readjusted and configured, and a second axle load value M2 of the test vehicle is obtained, wherein the second axle load value M2 is larger than the first axle load value M1;
testing vehicles to complete a second pre-runAfter heating and in a second vehicle internal resistance sliding mode, measuring a second vehicle internal resistance curve coefficient A2 (N/kph) at a second axle load value M2 according to the rotating hub2) B2(N/kph) and C2(N), and calculating through a second vehicle internal resistance curve coefficient to obtain a second vehicle internal resistance F2; and the second whole vehicle internal resistance sliding mode is that the speed of the test vehicle is accelerated to a first preset value and the neutral gear is engaged for sliding.
According to the vehicle rolling resistance testing method provided by the invention, the step of acquiring the first axle load value M1 of the tested vehicle specifically comprises the following steps:
setting an initial tire pressure value of a tire of a test vehicle in a first tire pressure calibration state;
the test vehicle obtains a first axle load value M1 of the tire in a first counterweight state, and simultaneously records an initial temperature value of the tire and an initial temperature value of the environment.
According to the vehicle rolling resistance testing method provided by the invention, the setting of the test vehicle readjustment configuration to obtain the second axle load value M2 of the test vehicle specifically comprises the following steps:
the test vehicle enables the tire pressure value of the tire to be consistent with the initial tire pressure value in the second tire pressure calibration state;
and (3) acquiring a second axle load value M2 of the tire of the test vehicle in a second counterweight state, ensuring that the temperature value of the tire is consistent with the initial temperature value of the tire, and ensuring that the temperature value of the environment is consistent with the initial temperature value of the environment.
According to the vehicle rolling resistance testing method provided by the invention, the first preheating of the test vehicle is completed, and the method specifically comprises the following steps:
and the test vehicle runs in a first preheating state according to the vehicle speed as a second preset value, wherein the second preset value is smaller than the first preset value, and the first preheating time is at least 1 hour.
According to the vehicle rolling resistance testing method provided by the invention, the second preheating of the test vehicle is completed, and the method specifically comprises the following steps:
and the test vehicle runs in a second preheating state according to the vehicle speed as a second preset value, wherein the time of the second preheating is the same as the time of the first preheating.
According to the vehicle rolling resistance testing method provided by the invention, the first vehicle internal resistance F1 and the second vehicle internal resistance F2 are respectively calculated and obtained through the following formulas:
first vehicle finishing internal resistance F1 ═ A1 XV2+B1×V+C1；
Second vehicle finishing internal resistance F2 ═ A2 XV2+B2×V+C2；
Wherein V is the vehicle speed.
According to the method for testing the rolling resistance of the vehicle, provided by the invention, the axle load difference value and the rolling resistance difference value are respectively obtained according to the two groups of axle loads and the two groups of internal resistances of the whole vehicle, and the method specifically comprises the following steps:
making a difference between the second axle load value M2 and the first axle load value M1 to obtain an axle load difference value M2-M1;
a difference is made between a second overall vehicle internal resistance F2 of the preset vehicle speed under the second axle load value M2 and a first overall vehicle internal resistance F1 of the preset vehicle speed under the first axle load value M1, the obtained overall vehicle internal resistance difference value is a rolling resistance difference value, and the rolling resistance difference value is equal to the rolling resistance F of the preset vehicle speed under the axle load value (M2-M1);
performing quadratic polynomial fitting operation on the rolling resistance F to obtain a rolling resistance curve coefficient A3 (N/kph) of the axial load value under (M2-M1)2)、B3(N/kph)、C3(N)。
According to the vehicle rolling resistance testing method provided by the invention, the step of calculating and obtaining the rolling resistance coefficients of the tires of the tested vehicle under different vehicle speeds specifically comprises the following steps:
the rolling resistance coefficient F of the preset vehicle speed V is equal to the rolling resistance F/[ (M2-M1) × 9.8 of the preset vehicle speed V]＝(A3×V2+B3×V+C3)/[(M2-M1)×9.8]。
According to the method for testing the rolling resistance of the vehicle, provided by the invention, the rolling resistance of the whole vehicle under different vehicle speeds is obtained through calculation according to the rolling resistance coefficient, and the method specifically comprises the following steps:
the rolling resistance F of the preset vehicle speed V is equal to the rolling resistance coefficient F x (M2-M1) x 9.8 of the preset vehicle speed V;
the rolling resistance F ═ M × (a3 × V) of the preset vehicle speed V2+B3×V+C3)]/(M2-M1)；
Wherein M is the overall vehicle mass of the test vehicle.
The invention provides a vehicle rolling resistance test method, which comprises the steps of firstly, respectively obtaining two groups of whole vehicle internal resistances corresponding to a test vehicle when the test vehicle loads two groups of different axle loads in a whole vehicle internal resistance sliding test state; then respectively acquiring an axle load difference value and a rolling resistance difference value according to the two groups of axle loads and the two groups of internal resistances of the whole vehicle; calculating and obtaining the rolling resistance coefficient of the tire of the test vehicle under different vehicle speeds according to the axle load difference value and the rolling resistance difference value; and then rolling resistance of the whole vehicle at different speeds is obtained through calculation according to the rolling resistance coefficient. Therefore, the vehicle rolling resistance testing method provided by the invention does not need to disassemble a transmission shaft and a brake disc of a tested vehicle, is simple and convenient to operate, can obtain the rolling resistance coefficient by calculating the axle load difference value and the whole vehicle internal resistance difference value, and can offset the bearing friction internal resistance and the transmission system resistance by the difference calculation mode, thereby improving the rolling resistance coefficient and the rolling resistance measuring precision.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
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In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic flow chart of a vehicle rolling resistance testing method provided by the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An embodiment of the method for testing rolling resistance of a vehicle according to the present invention is described below with reference to fig. 1, wherein rolling resistance is referred to as rolling resistance.
The vehicle rolling resistance testing method provided by the embodiment of the invention specifically comprises the following steps:
and respectively acquiring two groups of finished automobile internal resistances corresponding to the test vehicle when the test vehicle loads two groups of different axle loads in the finished automobile internal resistance sliding test state.
And respectively acquiring an axle load difference value and a rolling resistance difference value according to the two sets of axle loads and the two sets of internal resistances of the whole vehicle.
And calculating and obtaining the rolling resistance coefficient of the tire of the test vehicle under different vehicle speeds according to the axle load difference value and the rolling resistance difference value.
And calculating and obtaining the rolling resistance of the whole vehicle at different speeds according to the rolling resistance coefficient.
Therefore, the method for testing the rolling resistance of the vehicle has the advantages that the transmission shaft and the brake disc of the vehicle are not required to be disassembled, so that the operation is simpler and more convenient, the rolling resistance coefficient is obtained according to the difference value of the shaft load and the difference value of the internal resistance of the whole vehicle, the internal friction resistance of the bearing and the resistance of the transmission system can be offset by adopting the difference calculation mode, and the rolling resistance coefficient and the measurement precision of the rolling resistance are effectively improved.
In a specific embodiment of the present invention, when a test vehicle is in a whole vehicle internal resistance sliding test state, two groups of whole vehicle internal resistances corresponding to the test vehicle when two groups of different axle loads are loaded are respectively obtained, which specifically includes the following steps:
a first axle load value M1 of the test vehicle is obtained.
When the test vehicle is in a first vehicle internal resistance sliding mode after the test vehicle is preheated for the first time, a first vehicle internal resistance curve coefficient A1 (N/kph) at a first axle load value M1 is obtained according to the measurement of a rotating hub2) B1(N/kph) and C1(N), and calculating and obtaining a first vehicle internal resistance F1 according to the first vehicle internal resistance curve coefficient. Wherein, the internal resistance of first whole car slides the mode and does: the test vehicle is fixed on the rotary drum rack, and the rotary hub of the rotary drum rack is in resistance slipAnd in the running mode, the speed of the test vehicle is accelerated to a first preset value, and the neutral gear is engaged for sliding.
And after the test vehicle is kept still for a preset time, setting the test vehicle to readjust the configuration, and acquiring a second axle load value M2 of the test vehicle, wherein the second axle load value M2 is greater than the first axle load value M1.
After the test vehicle is preheated for the second time and is in a second vehicle internal resistance sliding mode, a second vehicle internal resistance curve coefficient A2 (N/kph) at a second axle load value M2 is measured according to the rotating hub2) B2(N/kph) and C2(N), and calculating through the second vehicle internal resistance curve coefficient to obtain a second vehicle internal resistance F2. Wherein, the second whole internal resistance of the car slides the mode and does: and enabling a rotary hub of the rotary drum stand to be in a resistance sliding mode, accelerating the speed of the test vehicle to a first preset value and engaging the neutral gear to slide.
The specific values of the first axial load value M1 and the second axial load value M2 may be determined according to actual test requirements.
The first predetermined value of the vehicle speed when the test vehicle operates in the resistance coasting mode may be determined according to actual test requirements. However, when the test vehicle is in the first full internal resistance coasting mode at the first axle load value M1 and when the test vehicle is in the second full internal resistance coasting mode at the second axle load value M2, the vehicle speeds of the test vehicle during the front and rear running processes should be controlled to be equal.
Specifically, the method for acquiring the first axle load value M1 of the test vehicle specifically comprises the following steps:
the test vehicle gives an initial tire pressure value of the tire in a first tire pressure calibration state.
The test vehicle obtains a first axle load value M1 of the tire in a first counterweight state, and simultaneously records an initial temperature value of the tire and an initial temperature value of the environment.
Specifically, the step of setting the test vehicle to readjust the configuration and obtaining the second axle load value M2 of the test vehicle specifically includes the following steps:
the test vehicle enables the tire pressure value of the tire to be consistent with the initial tire pressure value in the second tire pressure calibration state.
The test vehicle obtains a second axle load value M2 of the tire in a second counterweight state, ensures that the temperature value of the tire is consistent with the initial temperature value of the tire, and ensures that the temperature value of the environment is consistent with the initial temperature value of the environment.
Specifically, the test vehicle completes the first preheating, and specifically comprises the following steps:
the test vehicle runs under a first preheating state according to the vehicle speed as a second preset value, wherein the second preset value is smaller than the first preset value, and the first preheating time is at least 1 hour. That is, the vehicle speed when the test vehicle is operating in the resistive coast down mode should be greater than the vehicle speed when the test vehicle is warming up.
Specifically, the method for setting the test vehicle to complete the second preheating specifically comprises the following steps:
the test vehicle runs in a second preheating state according to the vehicle speed as a second preset value, wherein the time of the second preheating is the same as the time of the first preheating. That is, when the test vehicle is preheated twice, the vehicle speeds of the test vehicle for preheating twice are required to be controlled to be consistent, and the time for preheating twice is controlled to be consistent.
In a specific embodiment of the present invention, when the test vehicle loads two sets of different axle loads, two sets of vehicle internal resistances that are correspondingly obtained are the first vehicle internal resistance F1 and the second vehicle internal resistance F2, respectively, and then the first vehicle internal resistance F1 and the second vehicle internal resistance F2 are obtained by the following formulas:
first vehicle finishing internal resistance F1 ═ A1 XV2+B1×V+C1；
Second vehicle finishing internal resistance F2 ═ A2 XV2+B2×V+C2；
Wherein, V is the speed of a vehicle, and the numerical value of speed of a vehicle V can be selected according to the actual test demand.
In a specific embodiment of the present invention, an axle load difference value and a rolling resistance difference value are respectively obtained according to two sets of axle loads and two sets of internal resistances of a whole vehicle, which specifically includes the following steps:
and (3) making a difference between the second axle load value M2 and the first axle load value M1 to obtain an axle load difference value M2-M1.
And (3) subtracting the second integral vehicle internal resistance F2 of the preset vehicle speed under the second axle load value M2 from the first integral vehicle internal resistance F1 of the preset vehicle speed under the first axle load value M1, wherein the obtained integral vehicle internal resistance difference value is a rolling resistance difference value, and the rolling resistance difference value is equal to the rolling resistance F of the preset vehicle speed under the axle load value (M2-M1).
Performing quadratic polynomial fitting operation on the rolling resistance F to obtain a rolling resistance curve coefficient A3 (N/kph) of which the axial load value is (M2-M1)2)、B3(N/kph)、C3(N)。
The preset vehicle speed can be set according to actual test requirements, and multiple groups of vehicle speeds within a certain range can be selected. For example, if the first predetermined value for the vehicle speed at which the test vehicle is set to operate in the resistive coasting mode is greater than 100km/h, the selected predetermined vehicle speeds may be set to ten sets in the range of 10km/h to 100km/h, 10km/h, 20km/h, 30km/h, 40km/h, 50km/h, 60km/h, 70km/h, 80km/h, 90km/h, and 100km/h, respectively.
Specifically, the method for calculating and acquiring the rolling resistance coefficients of the tires of the test vehicle under different vehicle speeds specifically comprises the following steps:
the rolling resistance coefficient F of the preset vehicle speed V is equal to the rolling resistance F/[ (M2-M1) × 9.8 of the preset vehicle speed V]＝(A3×V2+B3×V+C3)/[(M2-M1)×9.8]。
The preset vehicle speed V can be set to different values according to actual test requirements.
Specifically, the method for obtaining the rolling resistance of the whole vehicle under different vehicle speeds according to the rolling resistance coefficient calculation specifically comprises the following steps:
the rolling resistance F of the preset vehicle speed V is equal to the rolling resistance coefficient F x (M2-M1) x 9.8 of the preset vehicle speed V;
the rolling resistance F ═ M × (a3 × V) of the preset vehicle speed V2+B3×V+C3)]/(M2-M1)；
Wherein M is the total vehicle mass of the test vehicle.
The preset vehicle speed V can be set to different values according to actual test requirements.
The rolling resistance test method of the vehicle of the present invention is explained below by a specific embodiment.
And S1, carrying out first tire pressure calibration on the test vehicle, and giving an initial tire pressure value of the tire of the test vehicle.
S2, carrying out primary balancing on the test vehicle, obtaining a first axle load value M1 of the tire under the primary balancing, and simultaneously recording a first tire temperature and a first environment temperature when the vehicle is weighted for the first time.
And S3, fixing the test vehicle on a rotary drum rack, starting an engine to preheat the test vehicle for the first time at the speed of 80km/h, wherein the preheating time is 1 hour.
And S4, adjusting the rotating hub of the rotating drum rack into a resistance sliding mode, and performing first whole vehicle internal resistance sliding on the test vehicle. That is, the vehicle speed of the test vehicle is accelerated to more than 100km/h by the engine, the test vehicle is in neutral sliding, and a first vehicle internal resistance curve coefficient A1 (N/kph) is measured by the rotating hub at a first axle load value M12) B1(N/kph) and C1(N), and calculating a first vehicle internal resistance F1 corresponding to the vehicle speed V according to the first vehicle internal resistance curve coefficient, wherein F1 is a1 × V2+B1×V+C1。
And S5, standing the test vehicle for 12 hours, performing secondary tire pressure calibration on the test vehicle, and adjusting the tire pressure value of the tire to be consistent with the initial tire pressure value.
S6, carrying out secondary balancing on the test vehicle, and obtaining a second axle load value M2 of the tire under the secondary balancing, wherein M2 is larger than M1, and ensuring that the second tire temperature during the secondary balancing is consistent with the first tire temperature and the second environment temperature during the secondary balancing is consistent with the first environment temperature.
And S7, starting the engine to perform secondary preheating on the test vehicle at the vehicle speed of 80km/h, wherein the preheating time is 1 hour.
And S8, adjusting the rotating hub of the rotating drum rack into a resistance sliding mode, and performing secondary whole vehicle internal resistance sliding on the test vehicle. That is, the vehicle speed of the test vehicle is accelerated by the engine to be consistent with the vehicle speed of the first vehicle internal resistance sliding, the vehicle is in neutral sliding, and the second vehicle internal resistance curve coefficient A2 (N/kph) at the second axle load value M2 is measured by the rotating hub2) B2(N/kph) and C2(N), and calculating and acquiring a second overall vehicle internal resistance F2 corresponding to the vehicle speed V through a second overall vehicle internal resistance curve coefficient, wherein F2＝A2×V2+B2×V+C2。
S9, making difference between the sliding internal resistance of the vehicle speed under the second axle load value M2 from 10km/h to 100km/h and the sliding internal resistance of the vehicle speed under the first axle load value M1 from 10km/h to 100km/h, and obtaining the internal resistance difference value of the whole vehicle, namely the rolling resistance F of the vehicle speed under the axle load value (M2-M1) from 10km/h to 100 km/h. Then, a second-order polynomial fitting operation is carried out on the rolling resistance F to obtain a rolling resistance curve coefficient A3 (N/kph) of which the vehicle speed ranges from 10km/h to 100km/h under the condition that the axle load value is (M2-M1)2)、B3(N/kph)、C3(N)。
S10, the rolling resistance coefficient F corresponding to the vehicle speed V is equal to the rolling resistance F/[ (M2-M1) × 9.8 corresponding to the vehicle speed V]＝(A3×V2+B3×V+C3)/[(M2-M1)×9.8]。
The corresponding vehicle speed V is preferably any value in a vehicle speed range of 10km/h to 100 km/h.
S11, where the rolling resistance F corresponding to the vehicle speed V is the rolling resistance coefficient F x (M2-M1) × 9.8 corresponding to the vehicle speed V;
that is, the rolling resistance F ═ M × (a3 × V) according to the vehicle speed V2+B3×V+C3)]/(M2-M1)。
Wherein M is the total vehicle mass of the test vehicle, and the corresponding vehicle speed V can be set to different values according to actual test requirements.
In conclusion, the vehicle rolling resistance testing method provided by the embodiment of the invention is simple to operate, high in testing precision, wide in application range and suitable for rolling resistance tests of different vehicle types.
In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the embodiments of the present invention can be understood in specific cases by those of ordinary skill in the art.
In embodiments of the invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A vehicle rolling resistance test method, comprising:
respectively acquiring two groups of finished automobile internal resistances corresponding to the test automobile when the test automobile loads two groups of different axle loads in a finished automobile internal resistance sliding test state;
respectively acquiring an axle load difference value and a rolling resistance difference value according to the two sets of axle loads and the two sets of internal resistances of the whole vehicle;
calculating and obtaining rolling resistance coefficients of tires of the test vehicle under different vehicle speeds according to the axle load difference value and the rolling resistance difference value;
and calculating according to the rolling resistance coefficient to obtain the rolling resistance of the whole vehicle at different speeds.
2. The vehicle rolling resistance test method according to claim 1, wherein the test vehicle respectively acquires two sets of vehicle internal resistances corresponding to the test vehicle when the test vehicle is loaded with two sets of different axle loads in a vehicle internal resistance sliding test state, and specifically comprises:
acquiring a first axle load value M1 of the test vehicle;
after the test vehicle is preheated for the first time and is in a first vehicle internal resistance sliding mode, obtaining a first vehicle internal resistance curve coefficient A1 (N/kph) at a first axle load value M1 according to the measurement of the rotating hub2) B1(N/kph) and C1(N), and calculating to obtain a first vehicle internal resistance F1 according to the first vehicle internal resistance curve coefficient; the first whole vehicle internal resistance sliding mode is that the speed of a test vehicle is accelerated to a first preset value and neutral gear sliding is carried out;
after the test vehicle is kept still for a preset time, the test vehicle is set to be readjusted and configured, and a second axle load value M2 of the test vehicle is obtained, wherein the second axle load value M2 is larger than the first axle load value M1;
after the test vehicle finishes the second preheating and is in the second whole vehicle internal resistance sliding mode, the second whole vehicle internal resistance curve coefficient A2 (N/kph) at the second axle load value M2 is measured according to the rotating hub2) B2(N/kph) and C2(N), and calculating through a second vehicle internal resistance curve coefficient to obtain a second vehicle internal resistance F2; and the second whole vehicle internal resistance sliding mode is that the speed of the test vehicle is accelerated to a first preset value and the neutral gear is engaged for sliding.
3. The vehicle rolling resistance test method according to claim 2, wherein the obtaining of the first axle load value M1 of the test vehicle specifically comprises:
setting an initial tire pressure value of a tire of a test vehicle in a first tire pressure calibration state;
the test vehicle obtains a first axle load value M1 of the tire in a first counterweight state, and simultaneously records an initial temperature value of the tire and an initial temperature value of the environment.
4. The vehicle rolling resistance test method according to claim 3, wherein the setting of the test vehicle readjustment configuration to obtain the second axle load value M2 of the test vehicle specifically comprises:
the test vehicle enables the tire pressure value of the tire to be consistent with the initial tire pressure value in the second tire pressure calibration state;
and (3) acquiring a second axle load value M2 of the tire of the test vehicle in a second counterweight state, ensuring that the temperature value of the tire is consistent with the initial temperature value of the tire, and ensuring that the temperature value of the environment is consistent with the initial temperature value of the environment.
5. The vehicle rolling resistance test method according to claim 2, wherein the test vehicle completes the first preheating, specifically comprising:
and the test vehicle runs in a first preheating state according to the vehicle speed as a second preset value, wherein the second preset value is smaller than the first preset value, and the first preheating time is at least 1 hour.
6. The vehicle rolling resistance test method according to claim 5, wherein the test vehicle completes the second preheating, specifically comprising:
and the test vehicle runs in a second preheating state according to the vehicle speed as a second preset value, wherein the time of the second preheating is the same as the time of the first preheating.
7. The vehicle rolling resistance test method according to any one of claims 2 to 6, wherein the first internal vehicle resistance F1 and the second internal vehicle resistance F2 are respectively calculated by the following formulas:
first vehicle finishing internal resistance F1 ═ A1 XV2+B1×V+C1；
Second vehicle finishing internal resistance F2 ═ A2 XV2+B2×V+C2；
Wherein V is the vehicle speed.
8. The method for testing the rolling resistance of the vehicle according to claim 7, wherein the step of respectively obtaining the axle load difference value and the rolling resistance difference value according to the two sets of axle loads and the two sets of internal resistances of the whole vehicle specifically comprises the following steps:
making a difference between the second axle load value M2 and the first axle load value M1 to obtain an axle load difference value M2-M1;
a difference is made between a second overall vehicle internal resistance F2 of the preset vehicle speed under the second axle load value M2 and a first overall vehicle internal resistance F1 of the preset vehicle speed under the first axle load value M1, the obtained overall vehicle internal resistance difference value is a rolling resistance difference value, and the rolling resistance difference value is equal to the rolling resistance F of the preset vehicle speed under the axle load value (M2-M1);
performing quadratic polynomial fitting operation on the rolling resistance F to obtain a rolling resistance curve coefficient A3 (N/kph) of the axial load value under (M2-M1)2)、B3(N/kph)、C3(N)。
9. The vehicle rolling resistance test method according to claim 8, wherein the calculating and obtaining the rolling resistance coefficient of the tire of the test vehicle at different vehicle speeds specifically comprises:
presetting the rolling resistance coefficient f of the vehicle speed V as presettingRoll resistance F/[ (M2-M1) × 9.8 for set vehicle speed V]＝(A3×V2+B3×V+C3)/[(M2-M1)×9.8]。
10. The vehicle rolling resistance test method according to claim 9, wherein the obtaining of the rolling resistance of the entire vehicle at different vehicle speeds according to the rolling resistance coefficient calculation specifically comprises:
the rolling resistance F of the preset vehicle speed V is equal to the rolling resistance coefficient F x (M2-M1) x 9.8 of the preset vehicle speed V;
the rolling resistance F ═ M × (a3 × V) of the preset vehicle speed V2+B3×V+C3)]/(M2-M1)；
Wherein M is the overall vehicle mass of the test vehicle.
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