CN1198125C - Multiple operation status automobile loading method on chassis ergometer - Google Patents
Multiple operation status automobile loading method on chassis ergometer Download PDFInfo
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- CN1198125C CN1198125C CN 02152399 CN02152399A CN1198125C CN 1198125 C CN1198125 C CN 1198125C CN 02152399 CN02152399 CN 02152399 CN 02152399 A CN02152399 A CN 02152399A CN 1198125 C CN1198125 C CN 1198125C
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Abstract
The present invention relates to a multiple operation status automobile simulation loading method on a chassis ergometer. Through tests, series of various models of automobiles and technical parameters, such as inertia of a chassis ergometer, resistance force, a wheel roller equivalent resistance coefficient, automobile running wind resistance, rolling resistance, etc., are obtained. In the state of each stable temperature for a vortex machine, each constant current is calibrated at each driving speed point, a coincidence relation among the temperature, the driving speed, loading force and exciting current or corresponding control parameters, and the coincidence relation is inputted into a computer. The series of the model of an automobile to be tested, the axle load, etc. are inputted. According to the temperature of the vortex machine, loading force and an excitation current value or a corresponding control parameter value of the vortex machine for each loading driving speed point can be obtained by the computer. In two operating conditions of an idle speed and a reducing speed, the exciting current is zero. In an operating condition of a uniform speed, constant force feedback control needs to be carried out according to Fb, and the load of an accelerating operating condition of the automobile is simulated by the multipoint driving speed transient loading.
Description
Technical field
The chassis dynamometer multi-state simulation loading method of getting on the car is, automobile on chassis dynamometer, simulate the idling, acceleration of road examination, at the uniform velocity, during the operation of deceleration multi-state, the turbine loading method.Belong to automotive performance detection method technical field.
Background technology
At present China does not still have the give it the gun simulation loading method of transient condition of automobile on chassis dynamometer, the chassis dynamometer multi-state simulation loading method of getting on the car will overcome existing deficiency, this method is applicable to that mainly the pollutant emission of automobile transient condition detects, and also is suitable for pollutant emission detection of ASM operating condition method and vehicle fuel economy and detects.
The chassis dynamometer that the simulated automotive multi-state travels has two kinds of patterns usually, and a kind of is that the chassis dynamometer elementary inertia adds automatically controlled loading simulation inertia, simple in structure; Another kind is the full inertia chassis dynamometer that adopts the inertial flywheel group, but the full inertia of approximate simulation automobile, complex structure; Because wheel is not equal to wheel cylinder resistance and chassis dynamometer self resistance sum in the travel resistance to rolling and the windage sum on road surface, so, even full inertia chassis dynamometer also needs transient simulation to load.
Summary of the invention
The pollutant emission of gasoline car transient condition detects, and is gasoline car in the idling of regulation, acceleration, at the uniform velocity, discharge detection under the deceleration multi-state.Idling operation is generally automobile neutral gear or holdback clutch, and the speed of a motor vehicle is zero, and the idling operation turbine is loaded as zero.The decelerating mode standard has two kinds of situations, if the retarded velocity of vehicle less than the retarded velocity of operating mode regulation, allows to use the vehicle braked device, so that the operating mode time according to the rules carries out; If the retarded velocity of vehicle is greater than the retarded velocity of operating mode regulation, deceleration time is shorter than operating mode official hour, then can return to the theoretical circulation official hour in the time in next constant speed or idling operation, and therefore, it also is zero that the decelerating mode turbine loads.At the uniform velocity the loading of operating mode is a stable state, needs the control of feedback constant force, and the loading of accelerating mode is a transient changing, need not FEEDBACK CONTROL, and at the uniform velocity operating mode and accelerating mode simulation loading method are as follows on the chassis dynamometer:
1, vehicle ' accelerating mode output drive strength F
t, equal the windage resistance F of vehicle '
1, wheel is at the resistance to rolling F that travels on ground
2, vehicle inertia acceleration resistance F
3Three's sum, i.e. F
t=F
1+ F
2+ F
3
A, F
1Relevant with vehicle series, can be by formula F
1=CaAV
2/ 21.15 (N) calculate.
The Ca-coefficient of air resistance, A-front face area m
2, V-speed of a motor vehicle km/h
Same vehicle series CaA approximately equal can make K
1=CaA/21.15 is constant F
1=K
1V
2, the input computing machine.
B, F
2Relevant with the vehicle Reference mass, can obtain the coefficient of rolling resistance of each speed of a motor vehicle point of each vehicle series by test,
For example: according to relevant test: car F
2=0.014mg (1+V
2/ 19440) (N),
Lorry F
2=mg (0.0076+0.000056V) (N) imports computing machine.
M-vehicle Reference mass kg, g-acceleration of gravity 9.8m/S
2V-speed of a motor vehicle km/h
C, F
3Be and the Reference mass of vehicle, rotation equivalent inertia and operating mode regulation acceleration have relation,
F
3＝(m+m
1)a
1 (N)
m
1The equivalent inertia kg of-vehicle revolving part
a
1The acceleration m/S of-operating mode regulation
2
2, the driving force F of automobile accelerating mode on chassis dynamometer
D
The driving force F of automobile accelerating mode on chassis dynamometer
D, be chassis dynamometer self resistance F
c, wheel cylinder frictional resistance F
f, automobile power-transmission system and chassis dynamometer equivalent inertia acceleration resistance Fa three sum, F
D=Fc+F
f+ Fa adopts free and loads twice coastdown or twice coastdown of increase and decrease inertia, can obtain the inertia of system under the various states, and the resistance of each speed of a motor vehicle point and loss power can obtain the equivalent inertia m of chassis dynamometer self
2, the revolving part equivalent inertia m of each vehicle series power train
3, and each vehicle series demarcates by the art skating of chassis dynamometer at the equivalent resistance coefficient of each speed of a motor vehicle point wheel cylinder, can get the instantaneous retarded velocity of each speed of a motor vehicle point of system, thereby obtain the F of each speed of a motor vehicle point
c,, can obtain the F of each speed of a motor vehicle point by vehicle series and driving shaft axle weight, the tire specification etc. of input institute inspection vehicle
f
Fa＝(m
2+m
3)a
1
m
2The equivalent inertia kg of-chassis dynamometer self
m
3The revolving part equivalent inertia kg of-automobile power-transmission system
3, turbine loading force F
bDetermine
F
b＝F
t-F
D＝F
1+F
2+F
3-Fc-F
f-Fa＝F
1+F
2-Fc-F
f+(m-m
2)a
1+(m
1-m
3)a
1
The equivalent inertia that makes non-drive wheels is m
4, m then
4=m
1-m
3
Adopt free and twice coastdown of loading or twice coastdown of increase and decrease inertia, can obtain the m of non-driving wheel (front-wheel)
4, and the wheel cylinder equivalent resistance coefficient of f-w-d vehicle, the input computing machine can be determined m by tire specification
4, also can determine m by vehicle series
4
Vehicle series, complete vehicle quality and driving shaft quality etc. by input institute inspection vehicle.As carry out the accelerating mode simulation loading, by formula F
b=F
1+ F
2+ (m+m
4-m
2) a
1-F
c-F
f, can obtain the F of each speed of a motor vehicle point
b, the speed of a motor vehicle changes, F
bAlso change.If carrying out at the uniform velocity, Work condition analogue loads a
1=0, F then
b=F
1+ F
2-Fc-F
fIf, carry out fuel consumption per hundred kilometers and detect at the uniform velocity simulation loading, at this moment, F
2In m be the complete vehicle quality kg of vehicle full load, the speed of a motor vehicle is constant, then F
bAlso constant.As carry out gasoline car ASM Work condition analogue and load waste gas and detect, F then
b=[F
1+ F
2+ (m+m
1) * a
1] λ-Fc-F
fThe number percent of λ-operating mode regulation power.
4, the demarcation of turbine loading force
After making turbine reach the temperature of regulation earlier, the record temperature, respectively under each equilibrium temperature state of turbine, whole inertial flywheels in conjunction with the top bottom-disc dynamometer machine, drive chassis dynamometer to max. speed with automobile, at every turn with Δ I as exciting current increment continuous current control loaded, adjust throttle, the loading force of each speed of a motor vehicle point when measuring continuous current when low speed (but change down), thereby can determine the corresponding relation between temperature, the speed of a motor vehicle, loading force, the electric current (or corresponding controlled variable) four, and input computing machine.During detection, measure the turbine temperature earlier, then according to the speed of a motor vehicle and corresponding F
b, computing machine is determined the loading current value (or corresponding control parameter value) of institute's each speed of a motor vehicle point of inspection vehicle automatically.
Embodiment
Vehicle series and each axle of the institute of input earlier inspection vehicle heavily wait, and computing machine calculates the F that respectively loads speed of a motor vehicle point automatically
b, according to the turbine temperature, can determine the loading current value (or corresponding controlled variable) of each speed of a motor vehicle point, at idling and decelerating mode, the turbine exciting current is zero.In operating mode at the uniform velocity, need press F
bCarry out the constant force FEEDBACK CONTROL.Come the load of simulating vehicle accelerating mode with multiple spot speed of a motor vehicle transient state Loading Method, with every 0.5km/h or 1km/h as loading speed of a motor vehicle point, because exciting current lags behind, so, about the instantaneous speed of a motor vehicle of survey is less than loading speed of a motor vehicle point 0.4km/h, can shift to an earlier date variable load, need not to carry out the constant force FEEDBACK CONTROL.
The chassis dynamometer multi-state simulation loading method of getting on the car, applicable to the pollutant emission of automobile transient condition detect, the pollutant emission detection of ASM operating condition method and vehicle fuel economy detect.Its outstanding feature is that simple in structure, simulation loading is accurate, and is easy to operate, quick.
Claims (4)
1, the chassis dynamometer multi-state simulation loading method of getting on the car, be the automobile idling of on chassis dynamometer, simulating road examination, acceleration, at the uniform velocity, during the operation of deceleration multi-state, the turbine loading method is characterized in that: physical simulation loading method step is as follows: (1) determines vehicle ' accelerating mode output drive strength F earlier
t, it equals the windage resistance F of vehicle '
1, wheel is at the resistance to rolling F that travels on ground
2, vehicle inertia acceleration resistance F
3Three's sum, F
t=F
1+ F
2+ F
3, same vehicle series F
1=K
1V
2The input computing machine, the F of each vehicle series
2Be the function of the vehicle Reference mass and the speed of a motor vehicle, F
2Functional expression input computing machine, F
3Reference mass m, rotation equivalent inertia m with vehicle
1, operating mode regulation acceleration a
1Relevant, F
3=(m+m
1) a
1(2) determine the driving force F of automobile accelerating mode on chassis dynamometer
D, it equals chassis dynamometer self resistance Fc, wheel cylinder frictional resistance F
f, automobile power-transmission system and chassis dynamometer equivalent inertia acceleration resistance Fa three sum, F
D=Fc+F
f+ Fa adopts free and twice coastdown of loading or twice coastdown of increase and decrease inertia, can obtain the inertia of system under the various states, the resistance and the loss power of each speed of a motor vehicle point, can get chassis dynamometer self resistance Fc and equivalent inertia m
2, the revolving part equivalent inertia m of each vehicle series power train
3, and each vehicle series by input institute inspection vehicle vehicle series, heavy, the tire parameter of driving shaft axle, can get F at each speed of a motor vehicle point wheel cylinder equivalent resistance coefficient
fAnd Fa=(m
2+ m
3) a
1(3) as carrying out the accelerating mode simulation loading, can get the loading force of each speed of a motor vehicle point of turbine, F
b=F
1+ F
2+ (m+m
4-m
2) a
1-Fc-F
f, the speed of a motor vehicle changes, F
bAlso change, adopt free and twice coastdown of loading or twice coastdown of increase and decrease inertia, can obtain the equivalent inertia m of non-drive wheels
4(4) demarcation of turbine loading force, after making turbine reach the temperature of regulation earlier, the record temperature, respectively under each equilibrium temperature state of turbine, whole inertial flywheels in conjunction with the top bottom-disc dynamometer machine, drive chassis dynamometer to max. speed with automobile, at every turn with Δ I as exciting current increment continuous current control loaded, adjust throttle and gear, the loading force of each speed of a motor vehicle point when measuring continuous current, thereby can determine the corresponding relation between temperature, the speed of a motor vehicle, loading force, electric current or the corresponding controlled variable, and input computing machine; When (5) detecting, measure the turbine temperature earlier, then according to the speed of a motor vehicle and corresponding F
bComputing machine is determined the loading current value or the corresponding control parameter value of institute's each speed of a motor vehicle point of inspection vehicle automatically, come the load of simulating vehicle accelerating mode with multiple spot speed of a motor vehicle transient state Loading Method, with every 0.5km/h or 1km/h as loading speed of a motor vehicle point, because exciting current lags behind, so, about the instantaneous speed of a motor vehicle of survey is less than loading speed of a motor vehicle point 0.4km/h, can shift to an earlier date variable load, need not to carry out the constant force FEEDBACK CONTROL.
2, according to the described chassis dynamometer of the claim 1 multi-state simulation loading method of getting on the car, it is characterized in that: idling operation is generally automobile neutral gear or holdback clutch, the speed of a motor vehicle is zero, and the idling operation turbine is loaded as zero, and it also is zero that the decelerating mode turbine loads.
3, according to the described chassis dynamometer of the claim 1 multi-state simulation loading method of getting on the car, it is characterized in that: Work condition analogue loads a if carry out at the uniform velocity
1=0, F then
b=F
1+ F
2-Fc-F
fIf, carry out fuel consumption per hundred kilometers and detect at the uniform velocity simulation loading, at this moment, F
2In m be the complete vehicle quality of vehicle full load, the speed of a motor vehicle is constant, then F
bAlso constant, in operating mode at the uniform velocity, need press F
bCarry out the constant force FEEDBACK CONTROL.
4, according to the described chassis dynamometer of the claim 1 multi-state simulation loading method of getting on the car, it is characterized in that: detect if carry out gasoline car ASM operating condition method simulation loading waste gas, press the ASM operating condition method and define F
b=[F
1+ F
2+ (m+m
1) a
1] λ-Fc-F
f, λ is the number percent of ASM operating mode regulation power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02152399 CN1198125C (en) | 2002-12-02 | 2002-12-02 | Multiple operation status automobile loading method on chassis ergometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02152399 CN1198125C (en) | 2002-12-02 | 2002-12-02 | Multiple operation status automobile loading method on chassis ergometer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1441237A CN1441237A (en) | 2003-09-10 |
| CN1198125C true CN1198125C (en) | 2005-04-20 |
Family
ID=27768608
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02152399 Expired - Fee Related CN1198125C (en) | 2002-12-02 | 2002-12-02 | Multiple operation status automobile loading method on chassis ergometer |
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| Country | Link |
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| CN (1) | CN1198125C (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100343648C (en) * | 2004-08-28 | 2007-10-17 | 吴明 | System testing method of multiple working condition loading of vehicle table amalog road test |
| CN101937005B (en) * | 2010-06-10 | 2012-01-04 | 吴明 | Method for detecting rated power vehicle speed of diesel vehicle |
| CN101839777B (en) * | 2010-06-11 | 2011-11-30 | 中国汽车技术研究中心 | Calibration method for parasitic friction resistance of electric dynamometer with isodromically-measured chassis |
| CN101893467A (en) * | 2010-07-28 | 2010-11-24 | 康明斯东亚研发有限公司 | Method for measuring fuel consumption of medium and heavy vehicles |
| CN102410900B (en) * | 2010-09-20 | 2014-02-19 | 北汽福田汽车股份有限公司 | Tyre rolling resistance testing method and chassis dynamometer |
| CN104764614B (en) * | 2015-03-31 | 2017-04-19 | 力帆实业(集团)股份有限公司 | Automobile driving mode emission testing method |
| CN106897533B (en) * | 2017-03-08 | 2019-11-05 | 安徽江淮汽车集团股份有限公司 | A kind of automobile resistance measurement method |
| CN109238740B (en) * | 2018-08-30 | 2020-03-24 | 安徽江淮汽车集团股份有限公司 | Comprehensive evaluation method for automobile sliding resistance based on whole automobile mass and volume |
| CN113281061B (en) * | 2021-05-23 | 2023-06-27 | 朱卫萍 | Verification method for detecting loading force of automobile under steady-state working condition |
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2002
- 2002-12-02 CN CN 02152399 patent/CN1198125C/en not_active Expired - Fee Related
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|---|---|
| CN1441237A (en) | 2003-09-10 |
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