CN101482438B - Vehicle equivalent weight torque dynamic property detection method - Google Patents
Vehicle equivalent weight torque dynamic property detection method Download PDFInfo
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- CN101482438B CN101482438B CN2008101886762A CN200810188676A CN101482438B CN 101482438 B CN101482438 B CN 101482438B CN 2008101886762 A CN2008101886762 A CN 2008101886762A CN 200810188676 A CN200810188676 A CN 200810188676A CN 101482438 B CN101482438 B CN 101482438B
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- equivalent weight
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Abstract
The invention relates to an automobile equivalent twisting moment power performance detection and estimation method, which comprises: obtaining the ratio K of the speed in predetermined gear position of the gearbox and the engine rotating speed of various models by scaling; when the engine rated torque speed n<m> is known, the speed V<m> can be obtained accurately, rotating speed error is eliminated, and the detection and estimate of the equivalent twisting moment power performance and the power performance is basically equivalent; when n<m> is unknown or the V<m> is determined by the corresponding gear in the model series statistics, detecting the automobile chassis output driving force at the speed point and the system neutral resistance, converting respectively into equivalent twistingmoments on the engine crankshaft; the consumed torques of engine accessories at the speed point can be set, and the equivalent twisting moment and the corresponding ratio of the engine can be obtained. The invention greatly reduces the influence of speed error, and increases the operationality and accuracy of power performance detection.
Description
Technical field
This method be automobile on chassis dynamometer, carry out a kind of method that vehicle equivalent weight torque dynamic property detects with engine torque capabilities might speed of a motor vehicle point, belong to bench teat automotive performance detection method technical field.
Background technology
Have now with engine torque capabilities might speed of a motor vehicle point and carry out Automobile Dynamic Performance Measurement and judge that following several method is arranged usually: a) according to motor car engine nominal torque point rotation speed n
m, main reducing gear ratio of gear i
0, wheel box ratio of gear i puts into gear
b, wheel calculates radius R and determines n
mCorresponding vehicle velocity V
m, carry out power detection and evaluation then.When lacking vehicle correlation technique parameter, then can't calculate.B) adopt dynamic inertia method to determine V
m, carry out power detection then.C) add up the V that determines corresponding gear with vehicle series
mCarry out power detection.Said method all is subjected to detecting the speed of a motor vehicle and puts having a strong impact on of corresponding engine speed and engine torque capabilities might point speed error, how under the condition that lacks vehicle chassis and engine correlation technique parameter, reduce the influence that speed error detects and estimates dynamic property as far as possible, this method is by demarcating, and carries out Automobile Dynamic Performance Measurement with the engine equivalent weight torque of automobile.
Summary of the invention
Automobile nominal torque point dynamic property detects and estimates and can detect and estimate with the power and the moment of torsion of engine, because near the engine torque value the engine torque capabilities might rotating speed point changes little, so, speed error is to the power of engine power performance or moment detects and error in judgement is little, but very big to the detection and the error in judgement of power.
The vehicle equivalent weight torque dynamic property detection method is, automobile on chassis dynamometer during the stable state constant speed, is measured the ratio K of the speed of a motor vehicle and engine speed with the regulation gear, the technical parameter of K input computing machine as this vehicle, sets the corresponding vehicle velocity V of stipulating gear
m, stable state detects V
mThe automobile chassis output drive strength F of speed of a motor vehicle point
D, F
DBe converted into the equivalent weight torque M on the engine crankshaft
D=K * F
D/ 0.377, can get ratio M
D/ M
m, M
mBe engine torque capabilities might; As measured automobiles neutral and stand total system V
mThe resistance F of point
SAfter, F
SBe converted into the equivalent weight torque M on the engine crankshaft
S=K * F
S/ 0.377, set engine accessory power rating at V
mThe consumption moment of torsion of speed of a motor vehicle point is δ * M
mThereby, obtain the engine torque M of this vehicle
E=M
D+ M
S+ δ M
m, can get ratio M
E/ M
m
As known n
mThe time, can set vehicle velocity V
m=K * n
m, eliminated speed error, the detection of equivalent weight torque dynamic property and power dynamic property and evaluation equivalence substantially; As corresponding gear V by vehicle series statistics
mCarry out equivalent weight torque and detect and estimate,, can reduce error owing to reduced the influence of rotating speed greatly; As the rated power P that only knows vehicle motor
eWith rated speed n
eThe time, the moment of torsion M of rated power point calculates in elder generation
e, can get intermediate value by statistics then and calculate n
m, V
mAnd M
mGasoline car n
m=0.65n
e, M
m=1.17M
e, diesel vehicle n
m=0.65n
e, M
m=1.13M
e, electric spraying diesel car corrective action is less, n
m=0.6n
e, M
m=1.07M
e
The concrete steps of vehicle equivalent weight torque dynamic property detection method are as follows:
1, determines the speed of a motor vehicle of vehicle specifies wheel box gear and the ratio K of engine speed
Press V=0.377 * n * R/ (i
0* i
b)
In the formula: V-driving wheel speed of a motor vehicle km/h;
N-engine speed r/min;
The R-tire calculates radius m;
i
oThe ratio of gear of-main reducing gear;
i
bThe ratio of gear that-wheel box is put into gear.
Connect the engine speed meter, vehicle hangs up the regulation gear, makes throttle at settling position on chassis dynamometer, measures simultaneously and the ratio K=V/n=0.377R/ (i of the speed of a motor vehicle during the registration of vehicle steady state (SS) and engine speed
o* i
b), input computing machine and as the technical parameter of this vehicle.
2, determine vehicle velocity V
m
As known vehicle engine torque capabilities might rotation speed n
m, calculate automatically and the V of definite regulation gear
m=K * n
mAs unknown n
m, can be by existing standard GB/T18276-2000 " vehicle dynamic quality bench test method and evaluation index ", with the corresponding gear V of vehicle series statistics
mDetermine the speed of a motor vehicle.As only knowing the rated power P of vehicle motor
e(kW) and rated speed n
e(r/min), calculate M earlier
e=9549P
e/ n
e, Nm is by vehicle statistics n
m=(0.6～0.7) n
e, gasoline car M
m=(1.14～1.20) M
e, diesel vehicle M
m=(1.0～1.16) M
e, the less n of electronic controlled diesel corrective action
m=(0.55～0.65) n
e, M
m=(1.05～1.09) M
e, desirable intermediate value.
3, detect automobile chassis output drive strength F
D
Vehicle hangs up the regulation gear, at V
mConstant speed control stable state detects F
D, N, and conversion obtains corresponding engine equivalent weight torque M on engine crankshaft
D=F
D* R/ (i
o* i
b)=F
D* K/0.377Nm can get ratio M
D/ M
m
4, detect the resistance F of automobile neutral total system
s
Detect F
DAfter, keep throttle constant, the device for power absorption unloading appoints the speed of a motor vehicle greater than V
mBehind the value 5km/h, the pine tar door is hung neutral, adopts twice art skating method of increase and decrease inertia, or sets coastdown of automobile chassis drive system equivalent inertia, measures V
m" stand and vehicle " total system resistance F of speed of a motor vehicle point
S=(m
1+ m) * and a, N.
In the formula: m
1-automobile neutral chassis power train equivalent inertia kg
M-chassis dynamometer equivalent inertia kg (known quantity)
A-V
mThe system slowdown degree m/s of speed of a motor vehicle point
2
Also can adopt freely to load twice coastdown, twice loading coastdown, the anti-steady state measurement method of dragging of motor records F
S, conversion can get corresponding engine equivalent weight torque M
s=F
s* K/0.377Nm.
5, calculation engine moment of torsion
If engine accessory power rating is at V
mIt is δ M that speed of a motor vehicle point consumes moment of torsion
m, can obtain at V
mThe engine torque M of speed of a motor vehicle point
E=M
D+ M
S+ δ M
m, can get ratio M
E/ M
m
Embodiment
Test with a homemade motor van embodiment is described: this vehicle is a diesel vehicle, its engine torque capabilities might M
mBe 172Nm, n
mBe 2000r/min, P
m=172 * 2000/9549=36kW, P
eBe 57kW, n
eBe 3600r/min, it is 4 retainings that regulation detects gear.
1, connect engine speed sensor, hang up wheel box 4 retaining, setting the speed of a motor vehicle is 55km/h constant speed power scale, and engine speed is 2349r/min when recording the speed of a motor vehicle and being 55.1km/h, calculating K=55.1/2349=0.02346, input computing machine.
2, as known n
m=2000r/min, automatically setting V
m=2000 * K=2000 * 0.02346=46.92 ≈ 47km/h.As unknown n
m, can determine V by 1040 vehicles series
mBe 55km/h.
3, this lorry is at 47km/h speed of a motor vehicle point constant speed stable state power scale P
D47Be 24.3kW, F
D47Be 1862N.At 55km/h constant speed power scale P
D55Be 28.6kW, F
D55Be 1873N.
4, keep throttle constant, the unloading of current vortex device, exciting current is zero, the speed of a motor vehicle raises, after the speed of a motor vehicle surpasses 60km/h, display screen prompting " the pine tar door is hung neutral ", neutral slides, and measuring system is at V
mThe retarded velocity of point can be established automobile chassis drive system equivalent inertia m
1=0.025M, M are vehicle Reference mass kg, as do not have this M parameter, and the available driver's of containing unloaded complete vehicle quality replaces, and once slides and obtains V
mThe SR F of speed of a motor vehicle point
S47=449N, P
S47=5.9kW; F
S55=498N, P
S55=7.6kW.
5, calculate the engine equivalent weight torque of 47km/h
M
D47＝1862×0.02346/0.377＝115.9，M
S47＝449×0.02346/0.377＝27.9，
If δ is 0.05, δ M
m=0.05 * 172=8.6, it is 8.6 * 2000/9549=1.8kW that the identical speed of a motor vehicle is put corresponding engine accessory power rating loss power, M
E47=115.9+27.9+8.6=152.4.
Chassis output power ratio η
D47=24.3/36=67.5%, engine capacity ratio η
P47=(24.3+5.9+1.8)/36=88.9%;
Chassis output torque engine ratio M
D47/ M
m=115.9/172=67.4%, engine torque ratio M
E47/ M
m=152.4/172=88.6%.
6, calculate the engine equivalent weight torque of 55km/h
M
D55＝1873×0.02346/0.377＝116.6， M
S55＝498×0.02346/0.377＝31.0，
M
E55＝116.6+31.0+0.05×172＝156.2，?M
D55/M
m＝116.6/172＝67.8％，
M
E55/M
m＝156.2/172＝90.8％， η
D55＝28.6/36＝79.4％，
η
P55＝(28.6+7.6+1.8)/36＝105.6％。
7, statistics is determined M
mAnd n
m
Can get the statistics intermediate value, when only knowing this vehicle motor P
e=57kW, n
eDuring=3600r/min, establish n
m=0.65n
e=0.65 * 3600=2340, V
m=2340 * 0.02346=55km/h, M
e=57 * 9549/3600=151.2, M
m=1.13 * 151.2=170.9, error is (170.9-172)/172=-0.6%.
Adopt this method, as known n
mDetermine V
m, torque ratio can be equivalent substantially with power ratio, as unknown n
m, can set V according to vehicle series or statistics
mEven, actual detected engine speed and n
mHave than mistake, owing to reduced the influence of rotating speed greatly, the engine equivalent weight torque that dynamic property is detected also influences not quite.The automobile of applicable different regulation gears detects in the dynamic property of engine torque capabilities might point, this method have detecting operation good, detect and estimate advantages such as accuracy is higher, simple, quick, only need minimum vehicle technology parameter, just can be to dynamic property detects compare accurately with car.
Claims (1)
1. vehicle equivalent weight torque dynamic property detection method is with the engine torque capabilities might vehicle velocity V
mCarry out dynamic property and detect, it is characterized in that: automobile on chassis dynamometer during the stable state constant speed, is measured the ratio K of the speed of a motor vehicle and engine speed with the regulation gear, the technical parameter of K input computing machine as this vehicle, sets the corresponding vehicle velocity V of stipulating gear
m, as known vehicle engine torque capabilities might rotation speed n
m, calculate automatically and the V of definite regulation gear
m=K * n
m, as unknown n
m, with the corresponding gear V of vehicle series statistics
mDetermine the speed of a motor vehicle; Stable state detects V
mThe automobile chassis output drive strength F of speed of a motor vehicle point
D, F
DBe converted into the equivalent weight torque M on the engine crankshaft
D=K * F
D/ 0.377, can get ratio M
D/ M
m, M
mBe engine torque capabilities might; Measured automobiles neutral and stand total system V
mThe resistance F of point
SAfter, F
SBe converted into the equivalent weight torque M on the engine crankshaft
S=K * F
S/ 0.377; Set engine accessory power rating at V
mThe consumption moment of torsion of speed of a motor vehicle point is δ * M
mThereby, obtain the engine torque M of this vehicle
E=M
D+ M
S+ δ M
m, can get ratio M
E/ M
m
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101886762A CN101482438B (en) | 2008-11-15 | 2008-12-19 | Vehicle equivalent weight torque dynamic property detection method |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810181803 | 2008-11-15 | ||
| CN200810181803.6 | 2008-11-15 | ||
| CN2008101886762A CN101482438B (en) | 2008-11-15 | 2008-12-19 | Vehicle equivalent weight torque dynamic property detection method |
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| Publication Number | Publication Date |
|---|---|
| CN101482438A CN101482438A (en) | 2009-07-15 |
| CN101482438B true CN101482438B (en) | 2011-02-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008101886762A Expired - Fee Related CN101482438B (en) | 2008-11-15 | 2008-12-19 | Vehicle equivalent weight torque dynamic property detection method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103439040A (en) * | 2013-08-21 | 2013-12-11 | 吴明 | Method for detecting resistance of reference temperature automotive transmission rack |
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| KR101593830B1 (en) * | 2014-10-14 | 2016-02-15 | 현대오트론 주식회사 | Method and apparatus for estimating engine power |
| CN105258830B (en) * | 2015-11-11 | 2017-11-28 | 吴明 | Automobile drive wheel surface power output detection method |
| CN107894790B (en) * | 2017-11-23 | 2020-03-17 | 重庆长安汽车股份有限公司 | Method for matching accelerator torque characteristics of MT (MT) vehicle type engine |
| CN111721547A (en) * | 2020-06-28 | 2020-09-29 | 安徽江淮汽车集团股份有限公司 | Plateau hill start analysis input data acquisition method, device, equipment and storage medium |
| CN112697429B (en) * | 2020-12-09 | 2022-12-02 | 朱卫萍 | Method for detecting resistance of neutral transmission system of passenger car |
| CN113218674A (en) * | 2021-02-07 | 2021-08-06 | 朱卫萍 | Method for detecting bench test dynamic property of automatic speed changing automobile |
| CN113029587B (en) * | 2021-02-19 | 2023-06-27 | 东风汽车集团股份有限公司 | Automobile performance analysis method, system, storage medium and electronic equipment |
| CN113915326A (en) * | 2021-09-30 | 2022-01-11 | 三一专用汽车有限责任公司 | Manual gear shifting prompting method and device, readable storage medium and engineering machinery |
| CN114509201B (en) * | 2022-02-17 | 2022-11-11 | 山东交通学院 | Road resistance simulation effect analysis method for vehicle bench test detection |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3805724C1 (en) * | 1988-02-24 | 1989-03-16 | Daimler-Benz Ag, 7000 Stuttgart, De | Method for the dynamic determination of the output power of a vehicle driven by means of an internal combustion engine |
| CN1480720A (en) * | 2002-09-08 | 2004-03-10 | 明 吴 | Multifunctional device for testing simulated load of cars |
-
2008
- 2008-12-19 CN CN2008101886762A patent/CN101482438B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3805724C1 (en) * | 1988-02-24 | 1989-03-16 | Daimler-Benz Ag, 7000 Stuttgart, De | Method for the dynamic determination of the output power of a vehicle driven by means of an internal combustion engine |
| CN1480720A (en) * | 2002-09-08 | 2004-03-10 | 明 吴 | Multifunctional device for testing simulated load of cars |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103439040A (en) * | 2013-08-21 | 2013-12-11 | 吴明 | Method for detecting resistance of reference temperature automotive transmission rack |
| CN103439040B (en) * | 2013-08-21 | 2015-06-17 | 吴明 | Method for detecting resistance of reference temperature automotive transmission rack |
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|---|---|
| CN101482438A (en) | 2009-07-15 |
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