CN108168752A - A kind of passenger car vehicle resistance of taxing decomposition test method - Google Patents
A kind of passenger car vehicle resistance of taxing decomposition test method Download PDFInfo
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- CN108168752A CN108168752A CN201711118316.0A CN201711118316A CN108168752A CN 108168752 A CN108168752 A CN 108168752A CN 201711118316 A CN201711118316 A CN 201711118316A CN 108168752 A CN108168752 A CN 108168752A
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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
- 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
- G01L5/28—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for testing brakes
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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 present invention provides a kind of passenger car vehicle resistance of taxing decomposition test method, step A：Vehicle and transmission system parameter prepare；Step B：Road coasting test；Step C：Chassis dynamometer is tested；Step D：Five motor test of 4 wheel driven；Step d1：Tire drag is calculated by the result of the test of step C and step D；Step d2：Brake caliper drags power+hub spindle load test；Step E：Two drive the driving experiment of three motors.A kind of passenger car vehicle resistance of taxing decomposition test method of the present invention, it can be applied to the research and development verification of vehicle, promoted including the analysis of competing product vehicle resistance versus, exploitation vehicle drag decomposition and transmission system parts type selecting, volume production vehicle resistance measurement and optimization etc., while the requirement that there is versatile, degree of precision, repeatability and interchangeability disclosure satisfy that transmission system resistance measurement by force.
Description
Technical field
The invention belongs to automobiles to research and develop testing field, and test side is decomposed more particularly, to a kind of passenger car vehicle resistance of taxing
Method.
Background technology
Automobile slide resistance includes air drag, rolling resistance, transmission resistance, brake drag resistance hysteresis, hub bearing
Resistance etc..The size of resistance of taxing influences the performance (particularly transmission efficiency) of transmission system, is vehicle dynamic property, fuel-economy
One of property and the key factor of emission compliance, especially have a significant impact to fuel economy.The implementation from 1 day January in 2016
National legislation GB19578-2014《Passenger Car Fuel Consumption Standard consumption limit value》And GB27999-2014《Passenger Car Fuel Consumption Standard consumption is evaluated
Method and index》, very strict requirement is proposed to the oil consumption of vehicle, the resistance of taxing for reducing vehicle is to realize that automobile energy-saving subtracts
One of the important means of row.
It is tested in industry about resistance of taxing at present, mainly using in GB/T12536-90 automobile slide test method specifications
Requirement, i.e., under vehicle road driving state, cut off the power of running part and engine, the inertia force of automobile storage at this time
It is equivalent to power source, vehicle is driven to move on, if automobile is more using the number of self inertia power and the distance that slides
It is bigger, that is, show running car inertia force application it is more abundant, resistance of taxing is smaller, and vehicle fuel consumption also can be lower.
In order to further study and reduce vehicle resistance of taxing, it is necessary to resistance of taxing be tested and decomposed, found each
The drag size of parts, so as to pointedly propose prioritization scheme.About resistance of taxing test and decompose, it has been disclosed that method
There are three types of.
Method one：Placement sensor measures on each parts during actual road test.Pacify on engine output shaft
Flexible board torque sensor and speed probe are filled to measure engine output net torque and rotating speed, installs and becomes in transmission system
The test sensor of the parts such as fast case, transmission shaft, semiaxis, to measure the torque of each node and rotating speed, in four wheels of vehicle
Upper installation torque sensor loses to measure tire drag, installs windage sensor in outside vehicle, obtains air-resistance power
Loss.
The engine output measured above and drive wheel power loss, driven wheel rotational power loss, tire
The difference of rolling power loss and air drag power loss is exactly the overall power loss of transmission system, then according to formula meter
Calculate the resistance of vehicle transmission system.The road test testing method can directly detect car transmissions
Can, but road conditions are difficult to control, and are limited by the difference of environment (humidity, temperature, wind speed) and region, result of the test repeatability
It is all poor with comparativity, and the experiment of vehicle road test is needed when installing each measuring part additional in the middle part of vehicle drive system
Part is divided to be modified design to facilitate installation measurement sensor.The sensor can typically be only used to an instruction carriage simultaneously,
It is difficult to continue and use, test the interchangeability and poor universality of sensor, because car transmissions performance is had nothing in common with each other, thus it is measured
Data are difficult to compare and analyze, it is difficult to establish common denominator data library.
Method two：Internal resistance is tested in chassis dynamometer.By carrying out vehicle respectively on chassis dynamometer and removing each
Coast-down check experiment under component, different operating modes, so as to measure including sliding speed variation and coasting time, coasting distance etc.
Data, and then the vehicle of various operating mode corresponding states and braking system, transmission system, speed change are calculated according to correlation formula
Each parts system internal resistance value such as case, main reducing gear, obtains the resistance distribution situation under each component mounting whole vehicle state.
Above-mentioned test method, the problem of being primarily present are：Firstth, using chassis dynamometer as test equipment, precision phase
To relatively low, there are relatively large deviations for test data；Secondth, in general, the above method tests out between max. speed and minimum speed
Several internal resistance values, and internal resistance value of the average value as test object is calculated, the resistance of its each speed point is thus replaced using average value
Power characteristic value cannot reflect actual conditions of the resistance with velocity variations；Third, this method are merely capable of decomposing braking system, needle
It is not comprehensive enough that drag decomposition is subtracted to gearbox internal resistance and master.
Method three：The method that the single parts such as transmission system and braking system are tested using rack.Such as：In needle
When carrying out single part engine bench test to transmission system, usually using motor as power source, in power train part input terminal
Rotating speed, torque sensor with output terminal are installed respectively, to obtain the parameter of corresponding torque and rotating speed, calculated according to test data
Go out each device power loss of power train, you can obtain each component resistance of transmission system.This monomer bench test test method and
Process settings all more flexibly, can be directed to structural parameters, test target of tests exemplar etc. and make corresponding change.But test examination
It tests between institute's simulated automotive operating mode and actual operating mode there are certain gap, and tests exemplar is surveyed on rack
During examination, load suffered by exemplar, vibration with the difference under vehicle operating status.
Invention content
In view of this, the present invention is directed to propose a kind of passenger car vehicle resistance of taxing decomposition test method, whole by testing
Vehicle resistance of taxing, and its vehicle resistance of taxing is decomposed, tests specific parts, for optimizing and resistance is slided in improvement
Power, completes the parts type selecting exploitation of new product transmission system, while can test road resistance of taxing, by testing and counting
Calculate, by resistance of taxing decompose simplified windage, rolling resistance, brake caliper drag power, the drag overall of hub spindle load, left/right before drive
Axis resistance and transmission neutral (N grades) resistance.
In order to achieve the above objectives, the technical proposal of the invention is realized in this way：
A kind of passenger car vehicle resistance of taxing decomposition test method, including：
Step A：Vehicle and transmission system parameter prepare；
Step B：Road coasting test；
Step C：Chassis dynamometer is tested；
Step D：Five motor test of 4 wheel driven；
Step d1：Tire drag is calculated by the result of the test of step C and step D；
Step d2：Brake caliper drags power+hub spindle load test；
Step E：Two drive the driving experiment of three motors.
Further, in step A, completion Vehicle preparation quality is weighed and counterweight, determines the tyre model of the vehicle and moves
State rolling radius.
Further, step B includes step b1：Operating mode is set as speed from high to low, records actual road test operating mode successively
The corresponding speed V of point and time, according to Data Processing Method, using least square method, simulation obtains vehicle resistance of taxing
Curve F1 1, i.e. F1 1=a1V2+b1V+C1, wherein a1、b1And C1It is standard value；
Step b2：Vehicle resistance of taxing Curve transform is obtained into the corresponding resistance F of each speed to simulation1 2, i.e. F1 2=F1 1=
a1V2+b1V+C1。
Further, step C includes step c1：Vehicle is placed on wheel chassis dynamometer machine, the control mould of chassis dynamometer
Formula is set as four-wheel drive pattern, ensures that chassis dynamometer and vehicle front and back wheel can rotate, it is ensured that the state one with step B
It causes；
Step c2：Chassis dynamometer is arranged to four-wheel towing astern pattern, and operating mode is accelerated to using chassis dynamometer dragging wheel
It sets more than max. speed, then by controlling the speed of chassis dynamometer, speed is made to be down to operating mode setting max. speed, constant speed
Operating, after speed is stablized, start recording wheel side force data, the record time is more than 30s；
Step c3：Measurement condition point is consistent with road coasting test, and record obtains each operating mode different rotating speeds and corresponds to chassis survey
Torque value before and after work(machine obtains its resistance of taxing：
Preceding wheel drag：F2 1For the value measured in friction speed V；
Wheel drag afterwards：F2 2For the value measured in friction speed V；
Test obtains the total resistance of taxing of vehicle on chassis dynamometer:
Step c4：Pass through formulaComputational short cut windage.
Further, step d1 includes d11：It dismantles four tires of vehicle, vehicle is placed in five motor bench of 4 wheel driven,
Operating mode is set as speed from low to high, and rotating speed is calculated according to the following formula：
N-rotating speed, V-speed, r-tire rolling radius；
d12：Record is obtained under each operating mode different rotating speeds correspondence, and five motor test rack of 4 wheel driven corresponds to four wheel hubs acquisitions
Torsion, wherein the power that each motor measures is followed successively by：
Left front wheel hub torsion：F3 1In wheel speed it is V for left front turbin generator1When the power that measures；
Off-front wheel hub torsion：F3 2In wheel speed it is V for off-front wheel motor1When the power that measures；
Left back wheel hub torsion：F3 3In wheel speed it is V for left back turbin generator1When the power that measures；
Off hind wheel hub torsion：F3 4In wheel speed it is V for off hind wheel motor1When the power that measures.
Step d13：Torque value before and after the chassis dynamometer tested step d12 is converted into rotating speed from low to high
Correspondence：
Preceding wheel drag：For in wheel speed V1When measured value；
Wheel drag afterwards：For in wheel speed V1When measured value.
Step d14：Pass through formula It is each to can obtain vehicle
The rolling resistance of tire：
Left/right front-wheel rolling resistance：
Left/right trailing wheel rolling resistance：
Further, in step d2, in five motor bench of 4 wheel driven, removing vehicle left drive axis and right drive axle；
By the torsion of five motor test rack of 4 wheel driven, four wheel hub acquisitions, record is obtained under each operating mode different rotating speeds, wheel hub drag overall
Power and hub spindle load are dragged including clamp, four wheel hub drag overalls are followed successively by：
Left front wheel hub drag overall：F4 1For in wheel speed V1When the power that measures；
Off-front wheel hub drag overall：F4 2For in wheel speed V1When the power that measures；
Left back wheel hub drag overall：F4 3For in wheel speed V1When the power that measures；
Off hind wheel hub drag overall：F4 4For in wheel speed V1When the power that measures.
Further, step d2 includes step d21：Further brake caliper is removed in four wheel hubs of vehicle, work
Condition is set as rotating speed equally from low to high, and record is obtained under each operating mode different rotating speeds, and five motor test rack of 4 wheel driven corresponds to four
The torsion of wheel hub acquisition, four hub spindle loads are followed successively by：
Left front hub bearing resistance：F5 1In wheel speed it is V for left front turbin generator1When the power that measures；
Off-front wheel hub bearing resistance：F5 2In wheel speed it is V for off-front wheel motor1When the power that measures；
Left back hub bearing resistance：F5 3In wheel speed it is V for left back turbin generator1When the power that measures；
Off hind wheel hub bearing resistance：In wheel speed it is V for off hind wheel motor1When the power that measures.
Step d22：The data of step d21 tests are calculated, obtain clamp drag：
Left front clamp drag：
Clamp drag before the right side：
Left back clamp drag：
Clamp drag behind the right side：
Further, step E includes step e1：Left driving shaft and right driving axle are measured on five motor test rack of 4 wheel driven
Drive shaft is mounted in two motor benches by respective layout angle, and drive shaft, operating mode setting are arranged according to actual angle measurement degree
For rotating speed equally from low to high, it is driven two and rotating speed setting is carried out on five motors；
Step e2：Record is obtained under each operating mode different rotating speeds, and two two motor test racks of drive correspond to drag size, wherein left
The drag size of right driving axle is followed successively by：
Left drive axis resistance：F7 1In wheel speed it is V for revolver motor1When the power that measures；
Right drive axle resistance：F7 2In wheel speed it is V for right wheel motor1When the power that measures.
Step e3：According to step D and step e2 test resistance data, transmission neutral/N grades of resistance is calculated：
Relative to the prior art, a kind of passenger car vehicle resistance of taxing decomposition test method of the present invention has following
Advantage：
1st, technique effect：The research and development verification of vehicle is can be applied to, including the analysis of competing product vehicle resistance versus, exploitation vehicle
Drag decomposition and transmission system parts type selecting, volume production vehicle resistance measurement and optimization promotion etc., while there is versatility
By force, degree of precision, repeatability and interchangeability disclosure satisfy that by force the requirement of transmission system resistance measurement, new model can be promoted to research and develop
Transmission system resistance problem is rapidly found in the process, is improved and is optimized in time, it is significant to enterprise research and development ability.
2nd, economic benefit
It can completely realize that resistance of taxing is tested, it is contemplated that 1 vehicle expense 20-30 ten thousand or so can completely be hindered
Power decomposition data if individually carrying out windage testing expenses ten thousand/platforms of estimated 75-90 in wind1 tunnel laboratory, saves R＆D costs,
Secondly, from the point of view of the development time, this test method can complete resistance of taxing in 1 month and decompose test, and fast verification can
Meet the time schedule of exploitation research and development verification, shorten the entire new model R＆D cycle to a certain extent.
Description of the drawings
The attached drawing for forming the part of the present invention is used to provide further understanding of the present invention, schematic reality of the invention
Example and its explanation are applied for explaining the present invention, is not constituted improper limitations of the present invention.In the accompanying drawings：
Fig. 1 is the flow chart of the present invention.
Specific embodiment
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.
In the description of the present invention, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " on ", " under ",
The orientation or position relationship of the instructions such as "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom ", " interior ", " outer " are
Based on orientation shown in the drawings or position relationship, it is for only for ease of the description present invention and simplifies description rather than instruction or dark
Show that signified device or element there must be specific orientation, with specific azimuth configuration and operation, therefore it is not intended that right
The limitation of the present invention.In addition, term " first ", " second " etc. are only used for description purpose, and it is not intended that instruction or hint phase
To importance or the implicit quantity for indicating indicated technical characteristic.The feature for defining " first ", " second " etc. as a result, can
To express or implicitly include one or more this feature.In the description of the present invention, unless otherwise indicated, " multiple "
It is meant that two or more.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected or be integrally connected；It can
To be mechanical connection or be electrically connected；It can be directly connected, can also be indirectly connected by intermediary, Ke Yishi
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood by concrete condition
Concrete meaning in the present invention.
The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
As shown in Figure 1, a kind of passenger car vehicle resistance of taxing decomposition test method, including：
Step A：It should complete Vehicle preparation quality before experiment to weigh and counterweight, the tyre model and dynamic for determining the vehicle are rolled
Dynamic radius.
It is tested in the long straight line place of selection Proving ground.
Vehicle ensures that window is closed, and outside vehicle is without correlation test equipment.
Vehicle is preheated before formally experiment is started, and vehicle continuously drives certain time at the uniform velocity speed, passes through
Power assembly running temperature is monitored, and meets heat engine requirement.
Automobile drives into slide section before, speed changer gear is put into neutral gear (releasing the clutch pedal)/N grades by driver, is used
Non-contact twin axle optics speed counter carries out writing speed and time, until automobile stops completely, other specific requirement ginsengs
Examine GB/T12536-90《Automobile slide test method》.
Step B：Operating mode is set as speed from high to low, respectively 120km/h, 115km/h, 110km/h, 105km/h,
100km/h、95km/h、90km/h、85km/h、80km/h、75km/h、70km/h、65km/h、60km/h、55km/h、50km/
H, 45km/h, 40km/h, 35km/h, 30km/h, 25km/h, 20km/h, 15km/h, 10km/h and 5km/h.
In view of the situation at test site, two sections of 120km/h-60km/h and 60km/h-5km/h can be divided to complete experiment, so
After connect into a complete operating condition of test.
The corresponding speed of record actual road test operating point and time successively, according to Data Processing Method, using minimum
Square law (it is generally acknowledged that automobile slide resistance meets quadratic function relation with speed), simulation obtains vehicle resistance of taxing curve,
That is F1 1=a1V2+b1V+C1。
Vehicle resistance of taxing Curve transform is obtained into the corresponding resistance of each speed to simulation, i.e.,：
F1 2=F1 1=a1V2+b1V+C1, F1 2For the corresponding resistance at vehicle velocity V (120), V (115) ... V (5).
Step C：Vehicle is placed on wheel chassis dynamometer machine, and the control model of chassis dynamometer is set as four-wheel drive mould
Formula ensures that chassis dynamometer and vehicle front and back wheel can rotate, it is ensured that with state consistency during road vehicle coasting test.
The wind turbine of chassis dynamometer is set as constant speed, ensures the necessary radiating condition of air inlet system for vehicle.
Before on-test, vehicle rotation system is preheated, vehicle equally at the uniform velocity speed continuous operation certain time,
It is run by monitoring power assembly, and meets heat engine requirement.
During test, first by vehicle deceleration to after static, speed changer is as neutral gear or N grades (automatic transmission vehicles), Chassis dynamometer
Machine is arranged to four-wheel towing astern pattern, and 125km/h or so is accelerated to using chassis dynamometer dragging wheel；Then by controlling chassis
The speed of dynamometer machine makes speed be down to 120km/h, constant speed operating；After speed stablizes 35 seconds, start recording wheel side force data.
It is consistent in measurement condition point and step B, speed from high to low, respectively 120km/h, 115km/h, 110km/h,
105km/h、100km/h、95km/h、90km/h、85km/h、80km/h、75km/h、70km/h、65km/h、60km/h、55km/
H, 50km/h, 45km/h, 40km/h, 35km/h, 30km/h, 25km/h, 20km/h, 15km/h, 10km/h and 5km/h.
Record obtains each operating mode different rotating speeds and corresponds to torque value before and after chassis dynamometer, obtains its resistance of taxing
Preceding wheel drag：F2 1For at vehicle velocity V (120), V (115) ... V (5), corresponding preceding resistance of taxing
Wheel drag afterwards：For at vehicle velocity V (120), V (115) ... V (5), it is corresponding after resistance of taxing
Test obtains the total resistance of taxing of vehicle on chassis dynamometer:
Pass through formulaThe contents of the section adds road friction power and chassis for vehicle road windage
The difference section of dynamometer machine drum surface frictional resistance as simplifies windage.
Step d1：It is carried out in five motor test room of 4 wheel driven, needs to prepare wheelboss flange tooling in advance, to equip vehicle when makes
With vehicle is placed in five motor bench of 4 wheel driven by four tires of vehicle of dismantling, and one should be arranged in right ahead before experiment
Wind turbine, air outlet alignment engine radiator.
Before on-test, vehicle drive system is preheated, and vehicle is led to at the uniform velocity speed continuous operation certain time
Monitoring power assembly temperature is crossed, and meets heat engine requirement, starts engine, neutral gear gear is set as if vehicle is manual gear；
Or vehicle is automatic catch, then is set as N grades of patterns.
Operating mode is set as speed from bottom to height, and rotating speed is configured on five motor of 4 wheel driven, is calculated according to the following formula
It arrives
N-rotating speed, V-speed, r-tire rolling radius
By tire parameter for 255/50R19, similarly hereinafter, to be calculated using above-mentioned formula, each operating mode spot speed is
39rpm,78rpm,117rpm,156rpm,195rpm,233rpm,272rpm,311rpm,350rpm,389rpm,428rpm,
467rpm,506rpm,545rpm,584rpm,623rpm,662rpm,700rpm,739rpm,778rpm,817rpm,856rpm,
895rpm,934rpm。
Five motor test rack of 4 wheel driven is corresponded to the torsion of four wheel hub acquisitions, record obtains each operating mode different rotating speeds pair
Should under, the power that four motors measure is followed successively by：
Left front wheel hub torsion：For in wheel speed V1(39)、V1(78)...V1(934) power measured when；
Off-front wheel hub torsion：For in wheel speed V1(39)、V1(78)...V1(934) power measured when；
Left back wheel hub torsion：For in wheel speed V1(39)、V1(78)...V1(934) power measured when；
Off hind wheel hub torsion：For in wheel speed V1(39)、V1(78)...V1(934) power measured when.
Torque value before and after the chassis dynamometer tested step d1 is converted into the correspondence of rotating speed from low to high：
Preceding wheel drag：F2 4For in wheel speed V1(39)、V1(78)...V1(934) measured value during measured value when；
Wheel drag afterwards：For in wheel speed V1(39)、V1(78)...V1(934) measured value during measured value when.
Pass through formulaIt can obtain each tire of vehicle
Rolling resistance：
Left/right front-wheel rolling resistance：
Left/right trailing wheel rolling resistance：
Step d2：In five motor bench of 4 wheel driven, removing vehicle left drive axis and right drive axle, before on-test,
Vehicle motor is closed, and parking brake unclamps；Vehicle is tested test system and is preheated, and five motor bench of 4 wheel driven is connected with constant rotational speed
Reforwarding row certain time.
Operating mode is set as rotating speed from low to high, rotating speed setting is carried out on five motor of 4 wheel driven, operating point rotary speed is successively
For：39rpm,78rpm,117rpm,156rpm,195rpm,233rpm,272rpm,311rpm,350rpm,389rpm,
428rpm,467rpm,506rpm,545rpm,584rpm,623rpm,662rpm,700rpm,739rpm,778rpm,817rpm,
856rpm,895rpm,934rpm。
Record is obtained under each operating mode different rotating speeds, and the torsion of four wheel hub acquisitions in step D, wheel hub drag overall includes blocking
Pincers drag power and hub spindle load, and four wheel hub drag overalls are followed successively by：
Left front wheel hub：It is left front turbin generator in wheel speed V1(39)、V1(78)...V1(934) measured value during measured value when；
Off-front wheel hub：It is off-front wheel motor in wheel speed V1(39)、V1(78)...V1(934) measured value during measured value when；
Left back wheel hub：It is left back turbin generator in wheel speed V1(39)、V1(78)...V1(934) measured value during measured value when；
Off hind wheel hub：It is off hind wheel motor in wheel speed V1(39)、V1(78)...V1(934) measured value during measured value when.
Step d21：In five motor bench of 4 wheel driven, further brake caliper is removed in four wheel hubs of vehicle, is tried
Before testing beginning, vehicle motor is closed, and vehicle is tested test system and is preheated, and five motor bench of 4 wheel driven is connected with constant rotational speed
Reforwarding row certain time.
Operating mode is set as rotating speed equally from bottom to height, and rotating speed is set on five motor of 4 wheel driven, operating mode spot speed：39rpm,
78rpm,117rpm,156rpm,195rpm,233rpm,272rpm,311rpm,350rpm,
389rpm,428rpm,467rpm,506rpm,545rpm,584rpm,623rpm,662rpm,
700rpm,739rpm,778rpm,817rpm,856rpm,895rpm,934rpm。
Record is obtained under each operating mode different rotating speeds, and five motor test rack of 4 wheel driven corresponds to the torsion of four wheel hub acquisitions,
Wherein four hub spindle loads are followed successively by
Left front hub bearing resistance：F5 1It is left front turbin generator in wheel speed V1(39)、V1(78)...V1(934) it is measured when
Power；
Off-front wheel hub bearing resistance：F5 2It is off-front wheel motor in wheel speed V1(39)、V1(78)...V1(934) it is measured when
Power；
Left back hub bearing resistance：F5 3It is left back turbin generator in wheel speed V1(39)、V1(78)...V1(934) it is measured when
Power；
Off hind wheel hub bearing resistance：It is off hind wheel motor in wheel speed V1(39)、V1(78)...V1(934) it is measured when
Power.
Step d22 calculates the step d21 data tested, and obtains clamp drag
Left front clamp drag：
Clamp drag before the right side：
Left back clamp drag：
Clamp drag behind the right side：
Step e1：It needs to measure left driving shaft and the respective arrangement of right driving axle on five motor test rack of 4 wheel driven before experiment
Angle.
Drive shaft is mounted in two motor benches, drive shaft is arranged according to actual angle measurement degree.
Before on-test, transmission shaft needs to preheat, and rack is with constant rotational speed continuous operation certain time.
Operating mode is set as rotating speed equally from bottom to height, is driven two and rotating speed setting is carried out on five motors, operating mode spot speed is
39rpm,78rpm,117rpm,156rpm,195rpm,233rpm,272rpm,311rpm,350rpm,389rpm,428rpm,
467rpm,506rpm,545rpm,584rpm,623rpm,662rpm,700rpm,739rpm,778rpm,817rpm,856rpm,
895rpm,934rpm。
Step e2：Record is obtained under each operating mode different rotating speeds, and two two motor test racks of drive correspond to drag size, wherein left
The drag size of right driving axle is followed successively by：
Left drive axis resistance：F7 1It is revolver motor in wheel speed V1(39)、V1(78)...V1(934) power measured when；
Right drive axle resistance：F7 2It is right wheel motor in wheel speed V1(39)、V1(78)...V1(934) power measured when.
Step e3：According to step D, step e2 and step 7 test resistance data, transmission neutral/N grades of resistance is calculated：
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
With within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention god.
Claims (8)
1. a kind of passenger car vehicle resistance of taxing decomposition test method, it is characterised in that：Including：
Step A：Vehicle and transmission system parameter prepare；
Step B：Road coasting test；
Step C：Chassis dynamometer is tested；
Step D：Five motor test of 4 wheel driven；
Step d1：Tire drag is calculated by the result of the test of step C and step D；
Step d2：Brake caliper drags power+hub spindle load test；
Step E：Two drive the driving experiment of three motors.
2. a kind of passenger car vehicle resistance of taxing decomposition test method according to claim 1, it is characterised in that：Step A
In, completion Vehicle preparation quality is weighed and counterweight, determines the tyre model and dynamic rolling radius of the vehicle.
3. a kind of passenger car vehicle resistance of taxing decomposition test method according to claim 1, it is characterised in that：Step B
Including step b1：Operating mode is set as speed from high to low, records the corresponding speed V of actual road test operating point and time successively, presses
According to Data Processing Method, using least square method, simulation obtains vehicle resistance of taxing curve F1 1, i.e. F1 1=a1V2+b1V+
C1；
Step b2：Vehicle resistance of taxing Curve transform is obtained into the corresponding resistance F of each speed to simulation1 2, i.e. F1 2=F1 1=a1V2+
b1V+C1。
4. a kind of passenger car vehicle resistance of taxing decomposition test method according to claim 3, it is characterised in that：Step C
Including step c1：Vehicle is placed on wheel chassis dynamometer machine, and the control model of chassis dynamometer is set as four-wheel drive pattern, is protected
Card chassis dynamometer and vehicle front and back wheel can rotate, it is ensured that the state consistency with step B；
Step c2：Chassis dynamometer is arranged to four-wheel towing astern pattern, and accelerating to operating mode using chassis dynamometer dragging wheel sets
More than max. speed, then by controlling the speed of chassis dynamometer, speed is made to be down to operating mode setting max. speed, constant speed fortune
Turn, after speed is stablized, start recording wheel side force data, the record time is more than 30s；
Step c3：Measurement condition point is consistent with road coasting test, and record obtains each operating mode different rotating speeds and corresponds to chassis dynamometer
Front and rear torque value obtains its resistance of taxing：
Preceding wheel drag：F2 1For the value measured in friction speed V；
Wheel drag afterwards：F2 2For the value measured in friction speed V；
Test obtains the total resistance of taxing of vehicle on chassis dynamometer:F2 3=F2 1+F2 2；
Step c4：Pass through formula FSimplify windage=F1 2-F2 3, computational short cut windage.
5. a kind of passenger car vehicle resistance of taxing decomposition test method according to claim 4, it is characterised in that：Step d1
Including d11：It dismantles four tires of vehicle, vehicle is placed in five motor bench of 4 wheel driven, operating mode is set as speed from low to high,
Rotating speed is calculated according to the following formula：
N-rotating speed, V-speed, r-tire rolling radius；
d12：Record is obtained under each operating mode different rotating speeds correspondence, and five motor test rack of 4 wheel driven corresponds to the torsion of four wheel hubs acquisitions
Power, wherein the power that each motor measures is followed successively by：
Left front wheel hub torsion：F3 1In wheel speed it is V for left front turbin generator1When the power that measures；
Off-front wheel hub torsion：F3 2In wheel speed it is V for off-front wheel motor1When the power that measures；
Left back wheel hub torsion：F3 3In wheel speed it is V for left back turbin generator1When the power that measures；
Off hind wheel hub torsion：F3 4In wheel speed it is V for off hind wheel motor1When the power that measures；
Step d13：Torque value before and after the chassis dynamometer tested step d12 is converted into the correspondence of rotating speed from low to high
Relationship：
Preceding wheel drag：F2 4For in wheel speed V1When measure front-wheel Resistance Value；
Wheel drag afterwards：F2 5For in wheel speed V1When measure trailing wheel Resistance Value；
Step d14：Pass through formula FPreceding rolling resistance=F2 4-F3 1-F3 2, FRolling resistance afterwards=F2 5-F3 3-F3 4It can obtain the rolling of each tire of vehicle
Resistance：
Left/right front-wheel rolling resistance：
Left/right trailing wheel rolling resistance：
6. a kind of passenger car vehicle resistance of taxing decomposition test method according to claim 5, it is characterised in that：Step d2
In, in five motor bench of 4 wheel driven, removing vehicle left drive axis and right drive axle；By five motor test rack of 4 wheel driven four
The torsion of wheel hub acquisition, record are obtained under each operating mode different rotating speeds, and wheel hub drag overall drags power and hub bearing including clamp
Power, four wheel hub drag overalls are followed successively by：
Left front wheel hub drag overall：F4 1It is left front turbin generator in wheel speed V1When the power that measures；
Off-front wheel hub drag overall：F4 2It is off-front wheel motor in wheel speed V1When the power that measures；
Left back wheel hub drag overall：F4 3It is left back turbin generator in wheel speed V1When the power that measures；
Off hind wheel hub drag overall：F4 4It is off hind wheel motor in wheel speed V1When the power that measures.
7. a kind of passenger car vehicle resistance of taxing decomposition test method according to claim 6, it is characterised in that：Step d2
Including step d21：Further brake caliper is removed in four wheel hubs of vehicle, operating mode be set as rotating speed equally from as low as
Height, record are obtained under each operating mode different rotating speeds, and five motor test rack of 4 wheel driven corresponds to the torsion of four wheel hub acquisitions, wherein four
A hub spindle load is followed successively by：
Left front hub bearing resistance：F5 1In wheel speed it is V for left front turbin generator1When the power that measures；
Off-front wheel hub bearing resistance：F5 2In wheel speed it is V for off-front wheel motor1When the power that measures；
Left back hub bearing resistance：F5 3In wheel speed it is V for left back turbin generator1When the power that measures；
Off hind wheel hub bearing resistance：F5 4In wheel speed it is V for off hind wheel motor1When the power that measures；
Step d22：The data of step d21 tests are calculated, obtain clamp drag：
Left front clamp drag：F6 1=F4 1-F5 1；
Clamp drag before the right side：F6 2=F4 2-F5 2；
Left back clamp drag：F6 3=F4 3-F5 3；
Clamp drag behind the right side：F6 4=F4 4-F5 4。
8. a kind of passenger car vehicle resistance of taxing decomposition test method according to claim 7, it is characterised in that：Step E
Including step e1：Left driving shaft and the respective layout angle of right driving axle are measured on five motor test rack of 4 wheel driven, will be driven
Axis is mounted in two motor benches, and drive shaft is arranged according to actual angle measurement degree, and operating mode is set as rotating speed equally from low to high,
Two drive progress rotating speed setting on five motors；
Step e2：Record is obtained under each operating mode different rotating speeds, and two two motor test racks of drive correspond to drag size, wherein left and right is driven
The drag size of moving axis is followed successively by：
Left drive axis resistance：F7 1In wheel speed it is V for revolver motor1When the power that measures；
Right drive axle resistance：F7 2In wheel speed it is V for right wheel motor1When the power that measures；
Step e3：According to step D and step e2 test resistance data, transmission neutral/N grades of resistance is calculated：F8=(F3 1+F3 2+
F3 3+F3 4)-(F4 1+F4 2+F4 3+F4 4)-(F7 1+F7 2)。
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