CN1310112A - Sliding calibration process of determining automobile chassis drive system efficiency - Google Patents
Sliding calibration process of determining automobile chassis drive system efficiency Download PDFInfo
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- CN1310112A CN1310112A CN 00118930 CN00118930A CN1310112A CN 1310112 A CN1310112 A CN 1310112A CN 00118930 CN00118930 CN 00118930 CN 00118930 A CN00118930 A CN 00118930A CN 1310112 A CN1310112 A CN 1310112A
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- CN
- China
- Prior art keywords
- chassis
- loss power
- automobile
- drive
- transmission system
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
- Testing Of Engines (AREA)
Abstract
The automobile test board technology features that the power loss of various speed points of the transmission system in chassis engometer for some automobile and that for serial automobiles are measured through free and loaded sliding to obtain equivalent resistance coefficient, which is input to computer to complete the calibration. Through measuring the output power of automobile chassis and the power loss of whole transmission system, may be obtained the output power of the engine, the power loss of the transmission system in chassis and the efficiency. The present invention is simple and can obtain accurate data.
Description
A kind of on chassis dynamometer, adopt sliding calibration process of determining automobile chassis drive system efficiency, belong to bench teat automotive performance method of inspection technical field.
Be used for the no anti-dragging device twin-roll chassis dynamometer of Automobile Dynamic Performance Measurement at present, still can not carry out the detection of automobile chassis drive system efficiency, thereby can not judge the dynamic property of automobile and the technology status of chassis transmission system exactly comprehensively.
The objective of the invention is is not having counter dragging on the chassis dynamometer, a kind of freedom is provided and loads the method that sliding calibration detects automobile chassis drive system system efficient, to overcome the above-mentioned deficiency of existing method of inspection.
Its groundwork of method of inspection of the present invention is: when automobile during in the enterprising action edge detection of chassis dynamometer, in drive wheel rolling resistance and chassis dynamometer transmission resistance sum, because the resistance of turbine etc. and axle drive shaft axle load are irrelevant, and in the idler pulley bearing resistance, a part is irrelevant with the axle drive shaft axle load, a part is relevant with the axle drive shaft axle load, and the drive wheel rolling resistance is relevant with the axle drive shaft axle load, so, can regard drive wheel rolling resistance and chassis dynamometer transmission resistance sum as the resistance side that has nothing to do with the drive wheel axle load and the resistance sum that is directly proportional with axle load.Express with mathematical expression:
F
fi=F
ei+f
iG
g ……(1)
F
Fi-drive wheel rolling resistance and chassis dynamometer transmission resistance sum (N).
F
Ei-chassis dynamometer transmission system idle resistance (N).
f
iThe equivalent drag coefficient of the different speed of a motor vehicle points of-a certain test vehicle.
G
g-axle drive shaft axle load (N).
F
EiBe irrelevant with detection vehicle drive shaft axle load.It is the inherent characteristic of specific model chassis dynamometer.It has reflected the idle resistance of this model chassis dynamometer transmission system at different speed of a motor vehicle points.And f
iG
gBe and the related resistance of axle drive shaft axle load.
Sliding calibration method: at an additional power-transfer clutch and the motor set up of the other end of chassis dynamometer turbine, adopt free and load and slide the systemic resistance that detects each speed of a motor vehicle point under the various states for twice, typical vehicle to each serial vehicle is demarcated respectively, obtain the equivalent drag coefficient of each speed of a motor vehicle point, and the input computing machine.Demarcating steps is as follows:
1, measures chassis dynamometer transmission system idle resistance F
Ei(N).
Starter motor makes the chassis dynamometer holdback clutch to the maximum speed that dallies, and lets alone art skating, in a certain speed of a motor vehicle interval range.
Iε
1=M
fi ……(2)
I-dynamometer driving system equivalent rotor inertia
M
Fi-systemic resistance square (Nm)
ε
1Deceleration/decel (radian/the S of-head roll
2)
ε
1=(ω
2-ω
1)/Δt
1 ……(3)
ω
2-drum speed (the radian/S) that picks up counting
ω
1The drum speed of-end timing (radian/S)
Δ t
1-art skating is from ω
2To ω
1Time gap (S)
I=M
fi/[(ω
2-ω
1)/Δt
1] ……(4)
Repeat once the anti-maximum speed that is dragged to again, on drive roller shaft, apply a known constant braking moment M
1After, holdback clutch allows chassis dynamometer load and slides.
Iε
2=M
fi+M
1 ……(5)
M
1-constant braking moment (Nm)
ε
2Deceleration/decel (radian/the S of head roll when-loading is slided
2)
Slide in the different processes ω at art skating with loading
2And ω
1The corresponding speed sampling value the same,
ε
2=(ω
2-ω
1)/Δt
2 ……(6)
Δ t
2-load and slide from ω
2To ω
1Time gap (S)
Above various the getting of simultaneous solution:
I=M
1/(ε
2-ε
1)
=M
1/[(ω
2-ω
1)/Δt
2-(ω
2-ω
1)/Δt
1]……(7)
Can record the I value, I substitution (2) formula can be obtained M in each speed of a motor vehicle interval
Fi=I (ω
2-ω
1)/Δ t
1This value is the chassis dynamometer transmission resistance square of average ground speed point in each speed of a motor vehicle interval, gets average speed value in this speed of a motor vehicle interval as speed parameter, thus chassis dynamometer transmission system loss power that can this speed point.The resistance of each speed of a motor vehicle point of chassis dynamometer transmission system and loss power input computing machine.
2, measure drive wheel lost motion system resistance F
Ki(N)
, as test vehicle drive wheel is placed on the dynamometer roller with each typical vehicle of different series vehicle, remove semiaxis, adopt above-mentioned freedom and twice coastdown of loading can detect the systemic resistance F of this state
Ki, then can obtain F after deducting drive wheel bearing resistance by a certain percentage
Fi
3, calculate the equivalent drag coefficient
Measure axle drive shaft axle load G
g(N)
Get by (1) formula: fi=(F
Fi-F
Ei)/G
gCan obtain the equivalent drag coefficient of various serial each speed of a motor vehicle point of vehicle respectively, and import computing machine, thereby finish the demarcation of the various serial vehicles of this model chassis dynamometer, remove additional motor and power-transfer clutch then.
Testing process: the vehicle of required detection vehicle series and axle drive shaft axle are heavily imported computing machine, and the fi that computing machine is demarcated by this vehicle series calculates the resistance of each speed of a motor vehicle point automatically, adds the resistance of the unloaded corresponding speed of a motor vehicle of chassis dynamometer transmission system, can obtain F
FiWith corresponding power loss P
iDetect the chassis horsepower output P of each speed of a motor vehicle point then
Di, neutral gear (or holdback clutch) adopts freedom and loads the loss power P that coastdown can detect whole drive system
Si, P
SiBe automobile chassis drive system loss power, drive wheel rolling resistance loss power, chassis dynamometer transmission system loss power three sum.So can get automobile chassis drive system loss power P
Ti=P
Si-P
iThe horsepower output P of driving engine
Ei=P
Di+ p
SiThe efficiency eta of automobile chassis drive system
Ti=(P
Ei-P
Ti)/P
Ei
Same vehicle series, its diameter of tyres and wheel pressure are approximately equal, and differing bigger is that the axle drive shaft axle is heavy, adopts standardization to consider this factor.Test shows that this method has demarcates simply, and the additional test cost of equipment is low, and is easy to detect, and data are accurate, advantages such as good operability.Can detect the dynamic property of automotive engine and the technology status of car chassis outputting power and automobile chassis drive system exactly.
Claims (7)
1, the method for measuring chassis dynamometer transmission system loss power is slided in free and loading.
2, remove the semiaxis of automobile drive axle, free and load the method that slides system loss power when measuring drive wheel and on chassis dynamometer, dallying.
3, the method for solving of equivalent drag coefficient.
4, the method for demarcating by serial vehicle.
5, by demarcating resulting each speed of a motor vehicle point equivalent drag coefficient, the vehicle series and the axle drive shaft axle of input institute inspection vehicle are heavy, calculate the method for chassis dynamometer transmission system loss power and drive wheel rolling resistance loss power sum automatically.
6, adopt measured automobiles chassis horsepower output and freedom and loading to slide the method that the whole drive unit loss power obtains engine output of measuring.
7, the method for calculating of automobile chassis drive system loss power and efficient.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00118930A CN1102236C (en) | 2000-08-08 | 2000-08-08 | Sliding calibration process of determining automobile chassis drive system efficiency |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00118930A CN1102236C (en) | 2000-08-08 | 2000-08-08 | Sliding calibration process of determining automobile chassis drive system efficiency |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1310112A true CN1310112A (en) | 2001-08-29 |
| CN1102236C CN1102236C (en) | 2003-02-26 |
Family
ID=4587359
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN00118930A Expired - Fee Related CN1102236C (en) | 2000-08-08 | 2000-08-08 | Sliding calibration process of determining automobile chassis drive system efficiency |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1102236C (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100405037C (en) * | 2005-02-18 | 2008-07-23 | 吴明 | Statistical method of system resistance based on road test and bench test about car in free running at neutral position |
| CN102322998A (en) * | 2011-08-05 | 2012-01-18 | 广州汽车集团股份有限公司 | Method for measuring inner frictional resistance of vehicle |
| CN103471752A (en) * | 2013-09-20 | 2013-12-25 | 华东交通大学 | Method for measuring power consumed by single-roller dynamometer |
| CN103728133A (en) * | 2014-01-24 | 2014-04-16 | 武汉理工大学 | Method for testing automotive transmission system resistance distribution |
| CN104165837A (en) * | 2014-08-19 | 2014-11-26 | 中国北方车辆研究所 | Measuring method for motion resistance coefficient of cross-country roads |
| CN107478437A (en) * | 2017-07-21 | 2017-12-15 | 北京新能源汽车股份有限公司 | A kind of road resistance and method of testing, device and the equipment of speed relation |
| CN107478427A (en) * | 2016-12-21 | 2017-12-15 | 宝沃汽车（中国）有限公司 | Car transmissions transmission efficiency method of testing |
| CN109141702A (en) * | 2018-08-24 | 2019-01-04 | 智车优行科技（上海）有限公司 | A kind of driving motor inner walkway method and system |
| CN113654809A (en) * | 2021-07-27 | 2021-11-16 | 河南德力新能源汽车有限公司 | Method for measuring actual sliding resistance coefficient of electric automobile by using VBOX equipment |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995023957A1 (en) * | 1994-03-02 | 1995-09-08 | Jesper Ankersen | A method and an apparatus for measuring the power or torque of a vehicle |
| CN1167254A (en) * | 1996-06-04 | 1997-12-10 | 张蔚林 | No load power-measuring machine for chassis of automobile |
| CN2281531Y (en) * | 1996-11-26 | 1998-05-13 | 田作友 | Power determiner for vehicle chassis |
| CN2311769Y (en) * | 1997-09-04 | 1999-03-24 | 江西智达计算机系统工程有限公司 | Vehicle chassis comprehensive performance detecting system |
-
2000
- 2000-08-08 CN CN00118930A patent/CN1102236C/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100405037C (en) * | 2005-02-18 | 2008-07-23 | 吴明 | Statistical method of system resistance based on road test and bench test about car in free running at neutral position |
| CN102322998A (en) * | 2011-08-05 | 2012-01-18 | 广州汽车集团股份有限公司 | Method for measuring inner frictional resistance of vehicle |
| CN103471752B (en) * | 2013-09-20 | 2016-04-06 | 华东交通大学 | A kind of method measuring single cylinder dynamometer machine autophage power |
| CN103471752A (en) * | 2013-09-20 | 2013-12-25 | 华东交通大学 | Method for measuring power consumed by single-roller dynamometer |
| CN103728133A (en) * | 2014-01-24 | 2014-04-16 | 武汉理工大学 | Method for testing automotive transmission system resistance distribution |
| CN104165837B (en) * | 2014-08-19 | 2016-08-17 | 中国北方车辆研究所 | A kind of assay method of cross-country road Friction drag coefficient of motion |
| CN104165837A (en) * | 2014-08-19 | 2014-11-26 | 中国北方车辆研究所 | Measuring method for motion resistance coefficient of cross-country roads |
| CN107478427A (en) * | 2016-12-21 | 2017-12-15 | 宝沃汽车（中国）有限公司 | Car transmissions transmission efficiency method of testing |
| CN107478427B (en) * | 2016-12-21 | 2019-09-20 | 宝沃汽车（中国）有限公司 | Car transmissions transmission efficiency test method |
| CN107478437A (en) * | 2017-07-21 | 2017-12-15 | 北京新能源汽车股份有限公司 | A kind of road resistance and method of testing, device and the equipment of speed relation |
| CN107478437B (en) * | 2017-07-21 | 2020-09-29 | 北京新能源汽车股份有限公司 | Method, device and equipment for testing relation between road resistance and vehicle speed |
| CN109141702A (en) * | 2018-08-24 | 2019-01-04 | 智车优行科技（上海）有限公司 | A kind of driving motor inner walkway method and system |
| CN113654809A (en) * | 2021-07-27 | 2021-11-16 | 河南德力新能源汽车有限公司 | Method for measuring actual sliding resistance coefficient of electric automobile by using VBOX equipment |
Also Published As
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|---|---|
| CN1102236C (en) | 2003-02-26 |
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