CN110702429B - Method for detecting power of instantaneous driving wheel during automobile running - Google Patents
Method for detecting power of instantaneous driving wheel during automobile running Download PDFInfo
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- CN110702429B CN110702429B CN201911187579.6A CN201911187579A CN110702429B CN 110702429 B CN110702429 B CN 110702429B CN 201911187579 A CN201911187579 A CN 201911187579A CN 110702429 B CN110702429 B CN 110702429B
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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
- G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
- G01L3/24—Devices for determining the value of power, e.g. by measuring and simultaneously multiplying the values of torque and revolutions per unit of time, by multiplying the values of tractive or propulsive force and velocity
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Abstract
The method for detecting the power of the instantaneous driving wheel during the running of the automobile comprises the steps that the instantaneous accelerations Xai and Yai and the instantaneous speed of the automobile are measured in the running acceleration process, the intersection point of an acceleration increasing straight line in the running direction Xai and a horizontal straight line Xa 0 is calculated as the starting moment of the acceleration process, the road surface slope angle B is converted by the Yai average value of a plurality of points before the moment, the downward sliding force or the upward slope resistance M multiplied by g multiplied by sinB of the automobile on a slope is added to the driving wheel output net driving force Fj in a maximum driving force mode, the speed Vx corresponding to the maximum value of Xai is determined, the driving wheel output net power Pj of the Vx speed is calculated, the rolling resistance power Pfx and the air resistance power Pwx of the Vx speed are calculated according to the wheel road surface rolling resistance coefficient and the air resistance coefficient formula counted by tests, and the driving wheel power Pj + Pfx + Pwx; alternatively, the maximum driving power detection method is adopted, and the driving power Pci of each vehicle speed point is obtained by adding the three components Pji, Pfi and Pwi of the same vehicle speed point, and the detected maximum driving power is obtained by obtaining the driving power Pci of each vehicle speed point as Pji + Pfi + Pwi.
Description
Technical Field
A method for detecting the power of instantaneous drive wheel of car features that when the car with different car mass is accelerated on different slope road and different strokes of accelerator pedal, the acceleration and slope angle of road are measured to calculate the rolling resistance and air resistance, and the drive force and power of drive wheel are detected.
Background
The existing automobile dynamic detection method in the prior art is generally to test on a chassis dynamometer rack or to hang a specified gear of a gearbox on a special road test runway of an automobile, firstly treading an accelerator pedal to the bottom to reach a specified speed, measuring the net power output by an automobile driving wheel, then measuring the no-load power loss of the transmission system by free sliding in a neutral gear, and correcting to obtain the loading power loss of the transmission system, wherein the net power output by the driving wheel is equal to the product of the driving force for accelerating the mass of the automobile and the speed, and the loading power loss of the transmission system is equal to the sum of the air resistance power of the automobile, the rolling resistance power of a wheel road surface and the loading resistance power of a. The method is only suitable for road test detection under the condition of a specified road surface, and is not suitable for measuring the instantaneous driving wheel power in the acceleration process of the automobile running on the road surface with different gradients and different accelerator positions. The method for detecting the power of the instantaneous driving wheel during the running of the automobile can overcome the defects of the prior art, the power of the instantaneous driving wheel is equal to the sum of net power, air resistance power, rolling resistance power of a wheel road surface and gradient resistance power of the road surface output by the driving wheel at the same speed point, and the running dynamic property of the automobile is reflected.
Disclosure of Invention
The rolling resistance coefficient f of the vehicle road surface is set to be approximately equal for the same tire type, and the air resistance coefficient C is set to be equal for the same vehicle body typeDAre also approximately equal. Vehicles of the same vehicle body type and the same tire type can be classified into the same vehicle type within a certain total mass range (truck) or within a certain vehicle body length range (passenger car), and the rolling resistance coefficient equation and the air resistance coefficient equation of all vehicles of the same vehicle type are the same. The statistical road test of various vehicle categories comprises the following steps:
1. tire categories can be divided into three categories: the width of the cross section of the bias tire and the width of the section of the radial tire are less than 8.25in, the width of the section of the radial tire is more than or equal to 8.25in, the body types of the passenger car and the articulated passenger car can be divided according to the length, and the body types of the truck can be divided according to the body form: such as low-grade plate trucks, high-grade plate trucks, wind scooper trucks, dump trucks, tractors, storage trucks, van vehicles, tank trucks and engineering vehicles (such as cement mixer trucks); however, the trucks also need to be divided into a plurality of quality categories according to the rated total mass M: if M is less than 10000kg, M is less than or equal to 10000kg and less than or equal to 15000kg, the passenger vehicle can be classified according to the reference mass. Different tire types, vehicle body types and quality types are combined into different vehicle types according to actual conditions.
2. At least one new vehicle type road test is used for each vehicle type, neutral gear sliding is carried out after the highest speed gear of a gearbox is hung to the highest speed, the vehicle running resistance Fa of each 10 integer vehicle speed points is measured, the vehicle driving half shaft rack test gearbox driving axle sliding resistance Fb is removed, after Fa-Fb is obtained or the simplified set smaller Fb is 0, the rolling resistance and the air resistance of the road surface of the wheel can be calculated by adopting a least square method, and the 10 integer vehicle speed points are obtainedCoefficient of rolling resistance f and coefficient of air resistance C of wheel road surfaceDAnd all the coefficients are corrected to be in a reference environment state, namely the temperature is 20 ℃; a corrected value of the atmospheric pressure of 100 kPa.
3. Calculating the linear equation or quadratic equation of f and vehicle speed, and calculating CDLinear or quadratic with vehicle speed. And if the same vehicle type has a plurality of new vehicle type tests, averaging to calculate a regression equation, wherein the unit of the vehicle speed is km/h.
The power detection method for the instantaneous driving wheel of the automobile is characterized in that a tester of a multi-dimensional acceleration sensor is adopted, the acceleration Xa of the automobile in the driving direction is measured in the X direction, or the instantaneous acceleration Xa is calculated by reading the instantaneous speed from an OBD interface or a mobile phone interface of the automobile, the acceleration Ya of the automobile in the vertical direction is measured in the Y direction and can be converted into a road slope angle B, the tester is installed on the automobile, and the inherent vehicle types are input according to the classification of road test vehicles: passenger car or bus or truck, body type, tire type, length x width x height of body size, front track. Before each driving, the mass M of the whole vehicle in translation can be input or measured, the tester calculates the rolling resistance coefficient fi and the rolling resistance Ffi of the wheel road surface of each vehicle speed according to the f equation of the vehicle type, wherein the f equation is fi multiplied by M multiplied by g, g is the gravity acceleration, and the C equation of the vehicle type is used for calculating the gravity accelerationDCalculating the air resistance coefficient C of each vehicle speed by an equationDiAnd air resistance Fwi ═ 0.5 × CDi×A×ρ×V0 2A is the frontal area of the vehicle in m2Air density ρ 1.189N · s2m-4Speed of vehicle V0Units m/s, V0 2＝Vi 2/12.96，ViThe unit km/h.
Maximum driving force detection method: the tester measures acceleration values Xai and Yai in the running acceleration process of the automobile, or reads the instantaneous speed from an OBD interface or a mobile phone interface of the automobile to calculate the instantaneous acceleration Xa, the acceleration growth rate of Xai is calculated to be larger than or equal to the specified growth rate, or Xai is larger than or equal to the specified acceleration, the tester judges the acceleration process, and the specified growth rate can be 0.1m/s2/s～2.0m/s2Selected in the range of/s, the specified acceleration being 0.1m/s2～2.0m/s2Selecting within a range, calculating Xai the intersection point of an acceleration increasing straight line and Xa 0 horizontal straight line as the starting time of the acceleration process, taking the average value of Yai of a plurality of points before the starting time as the acceleration detection value Yj in the Y direction, taking the calibration angle converted from Yj as the road slope angle B, selecting n points with the adjacent maximum value of Xai as detection sections, wherein n can be selected within a range of 1-8, the average value of the detection sections Xai is taken as the acceleration detection value Xj in the X direction, adding the downward sliding force or upward slope resistance M multiplied by g multiplied by sinB of the automobile on a slope to a driving wheel to output net driving force Fj, Fj is M multiplied by Xj +/-M multiplied by g multiplied by sinB, M is the input whole automobile translation mass, g is the gravity acceleration, adding sign is taken when B is an upward slope, subtracting sign is taken when B is a downward slope, reading the automobile speed Vx of Xai corresponding point from the automobile maximum value as km/h, the tester calculates the rolling resistance coefficient fx, the rolling resistance Ffx (fx multiplied by M multiplied by g), the rolling resistance power Pfx (Ffx multiplied by Vx/3600) and the air resistance coefficient C of the Vx vehicle speedDxAir resistance Fwx is 0.5 × CDx×A×ρ×V0 2And an air resistance power Pwx is Fwx Vx/3600 in unit kW, a driving wheel output net power Pj for calculating the Vx vehicle speed is Fj x Vx/3600 in unit kW, a detected driving wheel power Pc is Pj + Pfx + Pwx is obtained, and a corrected power is obtained by correcting the Pc in a standard environment state.
Maximum driving power detection mode: the method comprises the steps of measuring Vi, Xai and Yai at the same moment in the running acceleration process, calculating the wheel road surface rolling resistance coefficient fi, the rolling resistance Ffi (fi multiplied by M multiplied by g) and the rolling resistance power Pfi (Ffi multiplied by Vi/3600) of each vehicle speed by a tester in unit kW, and calculating the air resistance coefficient C of each vehicle speedDiAir resistance Fwi ═ 0.5 × CDi×A×ρ×Vi 2And an air resistance power Pwi is Fwi × Vi/3600 in unit kW, a driving wheel output net driving force Fji at each vehicle speed is calculated to be M × Xai ± M × g × sinB, a driving wheel output net power Pji is Fji × Vi/3600, and the driving wheel power Pci, Pfi, and Pwi at the same vehicle speed point are added to obtain a driving wheel power Pci at each vehicle speed point to be Pji + Pfi + Pwi, and a maximum driving wheel power is obtained.
The method for detecting the instantaneous driving wheel power during the running acceleration of the automobile is characterized in that: the tester of the multidimensional acceleration sensor is arranged on an automobile, the acceleration Xa in the driving direction of the automobile is measured in the X direction, or the instantaneous speed is read from an OBD interface or a mobile phone interface of the automobile to calculate the instantaneous acceleration Xa, the acceleration Ya in the vertical direction of the automobile is measured in the Y direction, the automobile measures the Xai, Yai and Vi at the same moment in the driving process, the tester automatically judges the acceleration process, the intersection point of an acceleration increasing straight line and an Xa-0 horizontal straight line is calculated Xai to be the starting moment of the acceleration process, the average value of Yai of a plurality of points before the moment is taken as the acceleration detection value Yj in the Y direction, n points adjacent to the maximum value of Xai are selected as detection sections, the average value of the detection sections Xai is taken as the acceleration detection value Xj in the X direction, Yj is converted into a road slope angle B, the downward sliding force or upward slope resistance M multiplied by g multiplied by sinB of the automobile on a slope is, fj is MxXj +/-Mxg xsinB, M is input integral vehicle translation mass, unit kg and g is gravity acceleration, when B is an ascending slope, a plus sign is taken, when B is a descending slope, a minus sign is taken, vehicle speed Vx corresponding to the maximum value of Xai and unit km/h are calculated, driving wheel output net power Pj of the Vx vehicle speed is calculated, and wheel road surface rolling resistance power Pfx and air resistance power Pwx of the Vx vehicle speed are calculated according to a rolling resistance coefficient and air resistance coefficient regression equation counted by tests, so that detected driving wheel power Pc is Pj + Pfx + Pwx; alternatively, the maximum driving power method is adopted, and the driving power Pci of each vehicle speed point is obtained by adding the three components Pji, Pfi and Pwi of the same vehicle speed point, which is Pji + Pfi + Pwi, and the detected maximum driving power is obtained. The method for detecting the power of the instantaneous driving wheel during the running of the automobile can detect the power of the instantaneous driving wheel under the conditions of different speeds, different travel of an accelerator pedal, different loading mass and different road gradients, and has the following technical characteristics.
(1) The device can be suitable for vehicle-mounted detection of various automobiles in any loading state, is not limited by the condition of a straight road surface, and can detect the instantaneous driving wheel power on the road surfaces with different gradients. The maximum driving force mode and the maximum driving power mode can be adopted.
(2) The average value Yai of a plurality of points before the acceleration process starting time is used as the acceleration detection value Yj in the Y direction, so that the detection error of Yai caused by the heavy load transfer when the automobile is accelerated can be avoided.
(3) The dynamic performance of the automobile under various acceleration conditions can be mastered at any time, and dynamic parameters in different periods can be counted and compared by storing the maximum power value of the driving wheel, the speed and other dynamic parameters every day, so that the reduction degree of the dynamic performance of the automobile can be judged, and accurate and reliable bases are provided for maintenance, maintenance and dynamic performance evaluation of the automobile.
Detailed Description
The concrete implementation mode of the method for detecting the instantaneous driving wheel power during the running of the automobile is described by taking an example of detecting a translational mass 1530kg passenger car in a maximum driving force detection mode, wherein a tester is arranged in the automobile, the directions of a multi-dimensional acceleration sensor X, Y respectively correspond to the running direction and the vertical direction of the automobile, and a measured acceleration Xai is greater than or equal to 0.3m/s2The time tester judges the acceleration process, 3 points with the maximum acceleration adjacent to n being 3 are taken as detection sections, and the average value Yai of 5 points before the starting time of the acceleration process is taken as the acceleration detection value Yj in the Y direction.
The windward area A of the passenger car is 2.38m2When the width of the section of the radial tire is less than 8.25in, the measurement of Xj when the accelerator pedal is stepped on is 1.56m/s2The slope angle B of the uphill road is 2.2 degrees, the vehicle speed Vx corresponding to the maximum value of Xai read from the OBD of the automobile is 72.6km/h, the rolling resistance coefficient fx of the vehicle speed point is 0.0083 according to a wheel road surface rolling resistance coefficient formula of the passenger vehicle, and the air resistance coefficient CDx0.3626, Fj × Xj ± M × g × 0sinB, 1530 × 11.56+1530 × 29.8 × 3sin2.2 ° -2962N, 2962 × 72.6/3600, 59.73kW, Ffx, fx × M × g, 0.0083 × 1530 × 9.8, 124N, Ffx, Vx/3600, 124 × 72.6/3600, 2.5, Fwx, 0.5 × C, and Fwx, 2962 × 11.56/3600Dx×A×ρ×V0 2The air resistance power Pwx Fwx Vx/3600 209 × 72.6/3600 kW 4.21kW, the driving wheel power Pc obtained by Pj + Pfx + Pwx 59.73+2.5+4.21 kW, and the detected power Pc is corrected under the standard environment condition to obtain the corrected power.
The method for detecting the power of the instantaneous driving wheel during the running of the automobile can comprehensively detect the instantaneous power performance of the automobile in various running states, and has the advantages of accuracy, quickness, real time and the like.
Claims (1)
1. The method for detecting the instantaneous driving wheel power during the running acceleration of the automobile is characterized in that: the tester of the multidimensional acceleration sensor is arranged on an automobile, the acceleration Xa in the driving direction of the automobile is measured in the X direction, or the instantaneous speed is read from an OBD interface or a mobile phone interface of the automobile to calculate the instantaneous acceleration Xa, the acceleration Ya in the vertical direction of the automobile is measured in the Y direction, the automobile measures the Xai, Yai and Vi at the same moment in the driving process, the tester automatically judges the acceleration process, the intersection point of an acceleration increasing straight line and an Xa-0 horizontal straight line is calculated Xai to be the starting moment of the acceleration process, the average value of Yai of a plurality of points before the moment is taken as the acceleration detection value Yj in the Y direction, n points adjacent to the maximum value of Xai are selected as detection sections, the average value of the detection sections Xai is taken as the acceleration detection value Xj in the X direction, Yj is converted into a road surface slope angle B, the downward sliding force or upward slope resistance M multiplied by g by sinB of the automobile on a, fj is MxXj +/-Mxg xsinB, M is input integral vehicle translation mass, unit kg and g is gravity acceleration, a plus sign is taken when ascending, a minus sign is taken when descending, vehicle speed Vx corresponding to the maximum value of Xai and unit km/h are taken, driving wheel output net power Pj of the Vx vehicle speed is calculated, and wheel road surface rolling resistance power Pfx and air resistance power Pwx of the Vx vehicle speed are calculated according to a rolling resistance coefficient and an air resistance coefficient regression equation counted by tests, so that detected driving wheel power Pc is Pj + Pfx + Pwx; alternatively, the maximum driving power method is adopted, and the driving power Pci of each vehicle speed point is obtained by adding the three components Pji, Pfi and Pwi of the same vehicle speed point, which is Pji + Pfi + Pwi, and the detected maximum driving power is obtained.
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| CN201910530412.9A CN110320051A (en) | 2019-06-10 | 2019-06-10 | The instantaneous driving wheel power detecting method of running car |
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| CN113188997B (en) * | 2021-04-29 | 2022-06-14 | 华侨大学 | Method, device, equipment and storage medium for measuring road surface friction coefficient |
| TWI790887B (en) * | 2022-01-10 | 2023-01-21 | 盈利達科技有限公司 | Calculation method and device of driving force acceleration |
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