CN1982861A - Inertia determination of automobile - Google Patents
Inertia determination of automobile Download PDFInfo
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- CN1982861A CN1982861A CN 200510132152 CN200510132152A CN1982861A CN 1982861 A CN1982861 A CN 1982861A CN 200510132152 CN200510132152 CN 200510132152 CN 200510132152 A CN200510132152 A CN 200510132152A CN 1982861 A CN1982861 A CN 1982861A
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- 238000000034 method Methods 0.000 claims abstract description 24
- 238000012360 testing method Methods 0.000 claims abstract description 16
- 230000009021 linear effect Effects 0.000 claims abstract description 9
- 238000013016 damping Methods 0.000 claims description 8
- 230000008859 change Effects 0.000 claims description 4
- 238000003556 assay Methods 0.000 claims description 3
- 230000001133 acceleration Effects 0.000 description 8
- 230000008569 process Effects 0.000 description 5
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000009795 derivation Methods 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
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- 238000004458 analytical method Methods 0.000 description 1
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- 238000013461 design Methods 0.000 description 1
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- 230000005484 gravity Effects 0.000 description 1
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Abstract
A method for determining inertia of automobile includes measuring out curve of taxing speed to time of automobile on flat road and taking out time t in taxing a linear section of V1 to V2 , measuring out resistance torque curve of automobile taxing under the same condition as measuring out said curve, obtaining rotary inertia of matched test machine on power assembly system, carrying out loading by loader of said test machine according to measured resistance torque curve to measure out time t in the same rotation variation section of V1 and V2 for obtaining inertia of measured automobile.
Description
Technical field
The present invention relates to a kind of assay method of automobile inertia, especially design a kind of power assembly system matching test bench that utilizes automobile inertia is carried out method for measuring.
Background technology
In the Automobile Detection field, generally adopt two kinds of methods to measure automobile inertia at present, below these two kinds of methods are briefly described.
1) calculates automobile inertia by experimental formula.
Experimental formula commonly used is:
Wherein, W is the two-wheel assumed (specified) load, and r is the rolling radius of wheel, and g is the gravity acceleration constant.
Wherein, W can calculate by following manner:
W=K(G
0+2600)
Wherein, K is a correction factor, K=0.86
G
0Empty wagons load, the i.e. suffered load of detent during empty wagons.
The shortcoming of utilizing above-mentioned experimental formula be calculate very coarse, can not be exactly on stand the actual operating mode of simulation.
2) measure the rotary inertia of automobile barycenter and each rotatable parts by physical pendulum method, three-way suspension etc., further, carry out mathematical modeling according to Location of Mass Center of Automobiles, obtain its frequency spectrum by actual road test then, again the frequency spectrum that obtains is analyzed, obtained the moment of inertia of automobile around its barycenter according to the analysis result of frequency spectrum.The shortcoming of this method is that process is very complicated, and needs some special equipment, and cost is very high.
The power assembly test-bed is used for full test engine characteristics and every function, whether can reach designing requirement with its car load power performance and every index after assessment and the entrucking of prediction engine, this has become an indispensable very important ring in the research automobile process.Generally, as shown in Figure 1, the power assembly test-bed comprises dynamometer machine, speed reduction unit, torque sensor, engine (and wheel box), and each parts uses the shaft coupling such as metallic laminations shaft coupling, the special-purpose shaft coupling of engine to connect.What deserves to be mentioned is that dynamometer machine is widely used in the field tests of automotive performance, can measured automobiles driving wheel output power, moment of torsion (or driving force) and rotating speed data such as (or speed), and these data presentation are come out.
Summary of the invention
The objective of the invention is to solve and calculate coarse and calculation of complex in the prior art, and the higher shortcoming of cost, provide a kind of calculating accurately/simply, and the lower-cost method that vehicle inertia is converted and simulated.
The invention provides a kind of conversion and analogy method of automobile inertia, comprise step: speed is taken out this curve medium velocity and is changed one section comparatively linear V with respect to the curve of time when a) measuring real vehicle and sliding when the smooth-riding surface
1To V
2The time t that is experienced; And measure the damping moment curve when automobile slides in this smooth-riding surface under the similarity condition; B) obtain the moment of inertia I of power assembly system matching test bench
εC) loader on the described stand loads according to the damping moment curve that records, and records same rotation speed change section V
1To V
2The time t of experience
v, obtain the inertia of tested automobile
The method that vehicle inertia is converted and simulated provided by the invention has to be calculated accurately, and owing to only need simple equipment with low cost, thereby have lower-cost advantage.
Description of drawings
Fig. 1 is the structural representation of power assembly testing table;
Fig. 2 is the structural representation that the power assembly testing table of flywheel is installed.
Embodiment
Introduce the specific embodiment of the present invention below in detail.
Automobile inertia conversion provided by the present invention and analogy method comprise step: a kind of conversion of automobile inertia and analogy method, comprise step: speed is taken out this curve medium velocity and is changed one section comparatively linear V with respect to the curve of time when a) measuring real vehicle and sliding when the smooth-riding surface
1To V
2The time t that is experienced; And measure the damping moment curve when automobile slides in this smooth-riding surface under the similarity condition; B) obtain the moment of inertia I of power assembly system matching test bench
εC) loader on the described stand loads according to the damping moment curve that records, and records same rotation speed change section V
1To V
2The time t of experience
v, obtain the inertia of tested automobile
For step a), can utilize speed detector, for example the vehicle speed sensor that is connected with computer is measured vehicle speed curve over time on the smooth-riding surface, and storage or show is on computers then taken out this curve medium velocity again and changed one section comparatively linear V
1To V
2The time of being experienced.So-called " smooth-riding surface " is meant that vehicle friction force between road surface and the vehicle when sliding is comparatively constant; So-called " comparatively linear " is meant that described slope of a curve (being the acceleration of automobile) is in certain scope, can not cause a kind of approximation method of huge deviation in computation process, and this method is used for common engineering calculation or signal Processing.In addition, can utilize common chassis dynamometer to record the damping moment curve of automobile.
For step b), obtain the moment of inertia I of power assembly system matching test bench
εMultiple existing method is arranged, and the data that for example can utilize described stand manufacturer to provide obtain by simple computation.Under the preferable case, obtain the moment of inertia I of this stand
εComprise step:
Step b1), the loader on the described stand is with certain torque T
1To rotation speed n, test the time t of experience from 0 towing astern
1
Step b2) this loader is with certain torque T
2To rotation speed n, measure the time t of experience from 0 towing astern
2
Step b3), utilize known calculating process:
The derivation of The above results is as follows:
T
1And T
2Because of this adopts bigger value, speed n then can not be too high, so just can change to n from 0 with very big acceleration, thereby guarantee that described acceleration has better linearity.
Because acceleration is very big, can thinks that therefore the variation from 0 to n of top equation medium velocity is linear, thereby obtain following equation:
Introduce step c) and derivation thereof below in detail.
Because the loader on the described power assembly system matching test bench is (step a)) that loads according to the damping moment curve that slides with the formula car, therefore the torque that loads on torque on the tested automobile and the described stand equates, promptly
I
vω
v=I
εω
ε
Wherein, ω
vAnd ω
εBe respectively the angular acceleration of the automobile that records by chassis dynamometer and the angular acceleration on the stand, and this two angular acceleration values all is the speed interval V that changes at approximately linear
1To V
2Between record, so this two accekerations also are approximately linears, thereby obtain,
Above-mentioned process can only be derived the inertia of automobile from the mathematics angle, and can not in the operation of reality, automobile inertia be simulated, therefore, for can be in practical operation the inertia of simulated automotive, need on the power assembly system matching test bench, increase the inertia of flywheel.
As shown in Figure 2, flywheel is connected between dynamometer machine output shaft and the speed reduction unit, utilizes the metallic laminations shaft coupling to be connected with the two, and utilizes any available flywheel fastener, and for example the flat key (not shown) is fixed.When engine drives this flywheel rotation, can from dynamometer machine, read desired parameter.
Under the preferable case, method provided by the invention further comprises step d), increases flywheel on described stand, and the inertia of this flywheel is
Increase after the flywheel inertia, then can be on described stand the inertia of simulated automotive, the inertia derivation of described flywheel is:
Claims (4)
1. the assay method of an automobile inertia comprises:
Speed is taken out this curve medium velocity and is changed one section comparatively linear V with respect to the curve of time when a) measuring real vehicle and slide when the smooth-riding surface
1To V
2The time t that is experienced; And measure the damping moment curve when automobile slides in this smooth-riding surface under the similarity condition;
B) obtain the moment of inertia I of power assembly system matching test bench
ε
C) loader on the described stand loads according to the damping moment curve that records, and records same rotation speed change section V
1To V
2The time t of experience
v, obtain the inertia of tested automobile
2. method according to claim 1, wherein, one section of described comparatively linearity is meant the line segment of slope within preset range.
3. method according to claim 1, wherein, described step b) comprises:
B1), the loader on the described stand is with torque T
1To rotation speed n, test the time t of experience from 0 towing astern
1
B2) this loader is with torque T
2To rotation speed n, measure the time t of experience from 0 towing astern
2B3), the inertia that obtains described stand is
4. method according to claim 1, wherein, this method further comprises d), on described stand, increasing flywheel, the inertia of this flywheel is
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CNB2005101321528A CN100516802C (en) | 2005-12-16 | 2005-12-16 | Inertia determination of automobile |
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CNB2005101321528A CN100516802C (en) | 2005-12-16 | 2005-12-16 | Inertia determination of automobile |
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Publication Number | Publication Date |
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CN1982861A true CN1982861A (en) | 2007-06-20 |
CN100516802C CN100516802C (en) | 2009-07-22 |
Family
ID=38165545
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101943633A (en) * | 2010-09-30 | 2011-01-12 | 武汉钢铁(集团)公司 | Measurement method for mechanical loss and fixed rotary inertia of driving system |
CN107782498A (en) * | 2017-10-10 | 2018-03-09 | 中国石油集团川庆钻探工程有限公司 | System and method for measuring equivalent rotational inertia of diesel engine |
CN114008431A (en) * | 2019-05-07 | 2022-02-01 | 安全负载测试技术有限公司 | Non-impact method and apparatus for testing stiffness and/or stability of one or more loads |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101858814A (en) * | 2010-06-11 | 2010-10-13 | 中国汽车技术研究中心 | Calibration method for measuring parasitic frictional resistance of electric dynamometer of chassis in gliding way |
CN107089314A (en) * | 2017-04-10 | 2017-08-25 | 安徽理工大学 | A kind of Novel bionic fishtail propulsion plant |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR0157738B1 (en) * | 1995-02-10 | 1999-03-30 | 김은영 | Method for measuring automobile motion resistance using distance-time inertia travelling test |
CN1195213C (en) * | 2001-03-04 | 2005-03-30 | 吴明 | Inertia increment and decrement method of detecting inertia, resistance and power of vehicle |
CN2476468Y (en) * | 2001-03-28 | 2002-02-13 | 吉林大学 | Back-pull testing device for vehicle chassis function test machine |
CN1193497C (en) * | 2001-12-05 | 2005-03-16 | 艾默生网络能源有限公司 | Non-synchronous motor rotary inertia identification method |
DE10236847A1 (en) * | 2002-08-08 | 2004-02-26 | Dr. Johannes Heidenhain Gmbh | Method for determining the moment of inertia of an electromotive drive system |
CN1525150A (en) * | 2003-08-03 | 2004-09-01 | 明 吴 | Method for equivalently simulating and detecting automobile skidding distance on chassis dynamometer |
-
2005
- 2005-12-16 CN CNB2005101321528A patent/CN100516802C/en not_active Expired - Fee Related
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101943633A (en) * | 2010-09-30 | 2011-01-12 | 武汉钢铁(集团)公司 | Measurement method for mechanical loss and fixed rotary inertia of driving system |
CN107782498A (en) * | 2017-10-10 | 2018-03-09 | 中国石油集团川庆钻探工程有限公司 | System and method for measuring equivalent rotational inertia of diesel engine |
CN114008431A (en) * | 2019-05-07 | 2022-02-01 | 安全负载测试技术有限公司 | Non-impact method and apparatus for testing stiffness and/or stability of one or more loads |
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CN100516802C (en) | 2009-07-22 |
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