CN1598523A - System testing method of multiple working condition loading of vehicle table amalog road test - Google Patents
System testing method of multiple working condition loading of vehicle table amalog road test Download PDFInfo
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- CN1598523A CN1598523A CN 200410076702 CN200410076702A CN1598523A CN 1598523 A CN1598523 A CN 1598523A CN 200410076702 CN200410076702 CN 200410076702 CN 200410076702 A CN200410076702 A CN 200410076702A CN 1598523 A CN1598523 A CN 1598523A
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Abstract
The invention is a system experiment method for multiple operating condition carriers in simulating road test. When detecting each kind of operating condition simulating to automobile road test with chassis dynamometer of automobile, it uses road test vehicle to slide in neutral gear to detect the system resistance at each speed point, uses free and secondary sliding method or secondary free sliding method by increasing or subtracting inertia, detects the system resistance at each speed point and the equivalent weight inertia of each part of the automobile, and detects the turbine force at each point, carries on accurate loading to automobile through the demarcation of the turbine. The method is accurate and quick.
Description
Technical field
The system test method of automobile bench teat simulation road examination multi-state load is that automobile simulate the road examination when carrying out various Performance Detection on chassis dynamometer, adopts the road to try and the bench test system test method(s) is determined the turbine heap(ed) capacity, belongs to automotive performance detection method technical field.
Background technology
At present China carries out automobile transient condition pollutant emission detections, ASM operating condition method toxic emission detection on chassis dynamometer, fuel economy detects and during the sliding performance detection, how to determine that the load of each operating mode is tried on institute inspection vehicle road, vehicle is loaded and the turbine heap(ed) capacity on check-out console, normally adopt test or estimation to determine the load of each several part, the experiment work amount is bigger, need some coefficients of estimation, as when calculating windage, need the estimation air resistance coefficient, thereby bring certain error.In my application for a patent for invention " chassis dynamometer get on the car multi-state simulation loading method ", during for required degree of precision simulation such as the type approval of vehicle and vehicle production consistency check, then be difficult to satisfy the accuracy of detection requirement.When existing vehicle neutral gear road examination coasting test,, influenced the accuracy of road examination owing to ignored the equivalent inertia of automobile neutral gear revolving part.The present invention adopts the system test method will overcome above-mentioned deficiency.
Summary of the invention
Carrying out pollutant emission detection of automobile type approval transient condition and fuel economy when detecting, bench teat need the idling, acceleration of transient simulation road examination, at the uniform velocity, the deceleration multi-state.When carrying out ASM operating condition method pollutant emission detection, the bench teat stable state is at the uniform velocity simulated the road trial work condition in regulation speed of a motor vehicle point transient state output power.To when the oil consumption of carrying out hundred kilometers with car detects, at the uniform velocity operating mode is tried on bench teat steady-state simulation road.When sliding performance detected, bench teat was simulated road examination deceleration coasting mode under the situation that turbine does not load.The present invention adopts the system test method, the concrete load in each link is not tested and determined, adopt vehicle road examination neutral gear to slide, the retarded velocity of measuring vehicle each speed of a motor vehicle point on road, thereby obtain the SR of vehicle neutral gear each speed of a motor vehicle point on road, adopt free and twice coastdown of loading or twice art skating method of increase and decrease inertia, detect the SR of each speed of a motor vehicle point of vehicle neutral gear bench teat, thereby it is simple, accurately, determine the heap(ed) capacity of turbine quickly, by the turbine loading force is demarcated under each equilibrium temperature state, obtain temperature, the speed of a motor vehicle, loading force, corresponding relation between the electric current (or corresponding controlled variable) four, thus accurately simulate road trial work condition.With the good sample car of technology status, the turbine loading force F of derivation accelerating mode
bFormula and analogy method are as general formula and method, and other operating mode is the special case of accelerating mode then, and the analogy method of the various Performance Detection of automobile is described.
1, the SR detection of each speed of a motor vehicle point is tried on automobile neutral gear bench teat and road.
1.1, automobile driving wheel on cylinder at a high speed the back hang neutral gear, adopt free and load twice coastdown or twice art skating method of increase and decrease inertia detection system equivalent inertia m
1SR F with each speed of a motor vehicle point
D, m
1Equal chassis dynamometer self equivalent inertia m
2With inspection automobile chassis drive system equivalent inertia m
3Sum.Usually adopt freedom and twice coastdown of loading or twice art skating method of increase and decrease inertia to detect m
2Equivalent inertia m with non-drive wheels
4, and the equivalent inertia m of automobile power-transmission system (containing engine)
5, and the technical parameter of their input computing machines as this vehicle series.The SR F of each speed of a motor vehicle point of automobile neutral gear bench teat
D, equal same speed of a motor vehicle point chassis dynamometer self resistance F
C, wheel cylinder frictional resistance F
f, automobile chassis drive system resistance Fe three sum, F
D=F
C+ F
f+ Fe.
1.2, the motor road test neutral gear slides, to slide measurement parameter the same with the bench teat neutral gear, automobile slides the V that measures each speed of a motor vehicle point on level road
I+1, V
I-1And t
I+1, t
I-1Thereby, can get speed of a motor vehicle point V
i=(V
I+1+ V
I-1The retarded velocity α of)/2
1iThereby, can get the examination of automobile neutral gear road and slide V
iThe SR F of speed of a motor vehicle point
t,
F
t＝(m+m
3+m
4)(V
i+1-V
i-1)/(t
i-1-t
i+1)＝(m+m
3+m
4)α
1i N
M---automobile Reference mass kg, V
i---speed of a motor vehicle m/s, t---time s
The SR F of each speed of a motor vehicle point is tried on automobile neutral gear road
t, equal the windage resistance F of same speed of a motor vehicle point
1, the travel resistance to rolling F of wheel on flat road surface
2, automobile chassis drive system resistance F
eThree's sum, F
t=F
1+ F
2+ F
e
1.3, owing to slide under the two states at bench teat and road examination automobile neutral gear, same vehicle is in the chassis of same speed of a motor vehicle point transmission resistance approximately equal, so, the difference F of road examination and bench test system resistance
t-F
D=(F
1+ F
2+ F
e)-(F
C+ F
f+ F
e)=(F
1+ F
2)-(F
C-F
f), reflection be, institute's inspection vehicle is at same speed of a motor vehicle point, the difference of road examination windage resistance, rolling resistance of wheel sum and bench teat chassis dynamometer self resistance, wheel cylinder frictional resistance sum, thereby avoided F
1, F
2, F
C, F
f, F
eEach several part resistance tests and calculating have been simplified test and have been improved accuracy of detection and operability.
F when 2, pollutant emission of automobile transient condition and fuel economy detect
bDetermine
The operating mode of two kinds of Performance Detection of pollutant emission of automobile transient condition and fuel economy is the same, by idling, acceleration, at the uniform velocity, decelerating mode formed, idling and when slowing down the turbine loading force be zero, the turbine loading force F of first derivation accelerating mode
b
2.1, motor road test accelerating mode engine output drive strength F
m, equal F
1, F
2, F
e, vehicle inertia acceleration resistance F
3Four sums, F
m=F
1+ F
2+ F
e+ F
3, F
3=(m+m
4+ m
5) α
2
α
2---the acceleration m/s of operating mode regulation
2
2.2, automobile bench teat accelerating mode engine output drive strength F
n, equal F
c, F
f, F
e, automobile power-transmission system and chassis dynamometer equivalent inertia sum acceleration resistance F
aFour sums, F
n=F
c+ F
f+ F
e+ F
a, F
a=(m
2+ m
5) α
2
2.3, work as F
mGreater than F
nThe time, by increasing turbine loading force F
b, make F
m=F
n+ F
b, when trying accelerating mode owing to same vehicle bench teat simulation road, the chassis transmission resistance approximately equal of same speed of a motor vehicle point, so, during accelerating mode, F
b=(F
1+ F
2+ F
e+ F
3)-(F
c+ F
f+ F
e+ F
a)=(F
1+ F
2+ F
e)-(F
c+ F
f+ F
e)+(m+m
4-m
2) α
2=F
t-F
D+ (m+m
4-m
2) α
2(1) speed of a motor vehicle changes, F
bAlso change.
2.4, when operating mode is tried at the uniform velocity on bench teat simulation road, α
2=0, by (1) formula as can be known, F
b=(F
1-F
2+ F
e)-(F
c+ F
f+ F
e)=F
t-F
D, poor for the examination of this speed of a motor vehicle point road and bench test system resistance.The speed of a motor vehicle is constant, F
bAlso constant.
F when 3, the toxic emission of ASM operating condition method detects
bDetermine
Press the definition of ASM operating condition method, vehicle ' regulation operating mode engine output drive strength F
m=(F
1-2+ F
e+ F
3) λ, F
3=(m+m
4+ m
5) α
2, λ---the number percent of operating mode regulation power, the bench teat stable state is operating mode engine output drive strength F at the uniform velocity
n=F
c+ F
f+ F
eSo,, F
b=F
m-F
n=(F
1+ F
2+ F
e) λ+(m+m
4+ m
5) α
2λ-(F
c+ F
f+ F
e)=F
tλ-F
D+ (m+m
4+ m
5) α
2λ, in the formula, (F
1+ F
2+ F
e) be that vehicle road examination neutral gear slides the SR at regulation speed of a motor vehicle point, (F
c+ F
f+ F
e) be that vehicle bench teat neutral gear slides the SR at regulation speed of a motor vehicle point, m
4+ m
5The equivalent inertia of automobile revolving part when being the regulation gear.At the uniform velocity steady-state simulation needs F
bThe constant force FEEDBACK CONTROL.
4, fuel consumption per hundred kilometers F when at the uniform velocity operating mode detects
bDetermine
Automobile is put at the uniform velocity road traveling in the regulation speed of a motor vehicle and is carried out fuel consumption per hundred kilometers and detect under the state of burden rating, by (1) formula as can be known, and α
2=0, F
b=(F
1+ F
2+ F
e)-(F
c+ F
f+ F
e), (F
1+ F
e+ F
e) be that sample car examination neutral gear in road under the state of burden rating slides institute's gauge and decide speed of a motor vehicle dot system resistance, the input computing machine, standard code when detecting with the car fuel consumption per hundred kilometers, allows to adopt the definite (F of computing method
1+ F
2+ F
e), and (F
c+ F
f+ F
e) be that the unloaded bench teat neutral gear of vehicle that same model is examined slides the SR that institute's gauge is decided speed of a motor vehicle point.
5, the demarcation of turbine loading force and control
After making the turbine loading make its equilibrium temperature that reaches each regulation earlier, the record temperature, whole inertial flywheels in conjunction with the top bottom-disc dynamometer machine, drive chassis dynamometer to max. speed with automobile, respectively under each equilibrium temperature state of turbine, carry out the continuous current control loaded with Δ I as the exciting current increment at every turn, adjust throttle and gear, the loading force of each speed of a motor vehicle point when measuring continuous current, thus can determine under the different equilibrium temperatures of turbine the speed of a motor vehicle, loading force, corresponding relation between the controlled variable of electric current or correspondence, and input computing machine, during detection, measure the turbine Current Temperatures earlier, then according to the speed of a motor vehicle and corresponding F
b, computing 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, and at idling and decelerating mode, the turbine exciting current is zero, and in operating mode at the uniform velocity, need be pressed 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 1km/h or some kilometers speed of a motor vehicle at interval as variable load 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.
6, examination coasting distance in bench teat equivalent simulation road detects
Suppose same vehicle two automobiles, one is the good sample car A vehicle of technology status, and another becomes B vehicle bench teat coasting distance Equivalent Conversion the road to try coasting distance by state of the art the unknown but the non-driving wheel drag is examined normally the B vehicle.
6.1, examination neutral gear in A vehicle road slides, in very little speed of a motor vehicle interval, by the principle of work and power,
0.5(m+m
3+m
4)V
2 i+1-0.5(m+m
3+m
4)V
2 i-1＝F
tL
t……(2)
L
t---try from V on A vehicle road
I+1To V
I-1Vehicle coasting distance m
F
t---try at V on A vehicle road
i=(V
I+1+ v
I-1The SR N of)/2 speed of a motor vehicle point
6.2, A vehicle bench teat neutral gear slides, in identical speed of a motor vehicle interval, by the principle of work and power,
0.5(m
2+m
3)V
2 i+1-0.5(m
2+m
3)V
2 i-1＝F
DL
D……(3)
L
D---A vehicle bench teat is from V
I+1To V
I-1Vehicle coasting distance m
F
D---A vehicle bench teat is at V
iThe SR N of speed of a motor vehicle point
6.3, B vehicle bench teat neutral gear slides, in identical speed of a motor vehicle interval, by the principle of work and power,
0.5(m
2+m
3)V
2 i+1-0.5(m
2+m
3)V
2 i-1＝F
1DL
1D……(4)
F
1D---B vehicle bench teat is at V
iThe SR N of speed of a motor vehicle point
L
1D---B vehicle bench teat is from V
I+1To V
I-1Vehicle coasting distance m
6.4, suppose that examination neutral gear in B vehicle road slides, in identical speed of a motor vehicle interval, by the principle of work and power,
0.5(m+m
3+m
4)V
2 i+1-0.5(m+m
3+m
4)V
2 i-1＝F
1tL
1t……(5)
F
1t---try at V on B vehicle road
iThe SR N of speed of a motor vehicle point
L
1t---try from V on B vehicle road
I+1To V
I-1Vehicle coasting distance m
In (2), (3), (4), (5) four formulas, owing to be same vehicle different vehicle, and on same chassis dynamometer, detect, so the m in various, m
2, m
3, m
4Be identical.(5) formula gets divided by (4) formula:
(m+m
3+m
4)/(m
2+m
3)＝F
1tL
1t/F
1DL
1D
L
1t＝F
1DL
1D(m+m
3+m
4)/F
1t(m
2+m
3)……(6)
6.5, same vehicle, no matter be road examination or bench teat neutral gear when sliding, in the automobile chassis drive system resistance approximately equal of identical speed of a motor vehicle point, and the chassis transmission resistance difference of different vehicle.The wheel wearing and tearing minor impact road pavement of supposing different vehicle is the same with cylinder, perhaps these slight errors is incorporated on the difference of automobile chassis drive system resistance into the F of then same vehicle different vehicle
1, F
2, F
c, F
fApproximately equal, establishing B vehicle chassis transmission resistance is F
1e,
A vehicle F then
t-F
D=(F
1+ F
2+ F
e)-(F
c+ F
f+ F
e)=F
1+ F
2-F
c-F
f,
B vehicle F
1t-F
1D=(F
1+ F
2+ F
1e)-(F
c+ F
f+ F
1e)=F
1+ F
2-F
c-F
f,
So, F
t-F
D=F
1t-F
1D, F
1t=F
t-F
D+ F
1DSubstitution (6) formula gets:
L
1t＝F
1DL
1D(m+m
3+m
4)/(F
t-F
D+F
1D)(m
2+m
3)……(7)
Make inertia correction factor K
m=(m+m
3+ m
4)/(m
2+ m
3), K
mBe constant, irrelevant with the speed of a motor vehicle, make SR correction factor K
F=F
1D/ (F
t-F
D+ F
1D), K
FRelevant with the speed of a motor vehicle, L then
1t=K
mK
FL
1DFrom initial velocity V
0It is zero sliding to the speed of a motor vehicle, all set up in each speed of a motor vehicle interval (7) formula, so, B vehicle bench teat equivalence road examination coasting distance L '
t=K
m∑ K
FL
1D, as K at each speed of a motor vehicle point of low speed
FChange when little desirable each speed of a motor vehicle point K
FMean value K replace the K of each speed of a motor vehicle point
F, L ' then
t=K
mK ∑ L
1D=K
mKL '
1D,
L '
1D---the B vehicle bench teat of examining from V
0Slide the coasting distance m when the speed of a motor vehicle is zero
To when the detection of usefulness car coasting distance is not high as accuracy requirement, also can ignore m
3And m
4Influence, make K
m=m/m
2
Its detection method is: same vehicle selects for use a good sample car road examination of technology status to slide, and measures the F of each speed of a motor vehicle point
t, and the input computing machine, its road examination coasting distance can be used as the calibration value of this vehicle.Then this vehicle is adopted free on chassis dynamometer and twice coastdown of loading or twice art skating method of increase and decrease inertia, the F of each speed of a motor vehicle point of measuring system
DAnd input computing machine.During the arbitrary vehicle detection of this vehicle, adopt free and load twice coastdown or twice art skating method of increase and decrease inertia, only need bench teat just can detect the F that obtains each speed of a motor vehicle point
1D, the L in each speed of a motor vehicle interval
1DAnd L '
1D, and can record m
3, and m
2And m
4Be the test input value, computing machine can calculate the coasting distance L ' of institute's inspection vehicle equivalence road examination automatically
t
Embodiment
1, with sample car that technology status is good of each vehicle series, elder generation adopts free and loads twice coastdown or increase and decrease twice art skating method of inertia, obtains the m of each vehicle series
3, m
4, m
5, m
2SR F with each speed of a motor vehicle point
D, and the input computing machine, examination neutral gear in road slides the SR F that measures each speed of a motor vehicle point then
tSliding to the speed of a motor vehicle with the regulation initial velocity is zero coasting distance, and the input computing machine.Turbine is demarcated under different equilibrium temperatures,,, determine Control current automatically according to turbine temperature, the speed of a motor vehicle, loading force turbine temperature, the speed of a motor vehicle, loading force and exciting current or these corresponding parameter input computing machines of corresponding controlled variable.
2, when the service check that carries out the automobile type approval and very high simulation precision require, should determine same vehicle again after bench teat and the road examination loading force of each speed of a motor vehicle point turbine respectively.
3, same vehicle detects and when carrying out various Performance Detection with car, normally regulation operating mode engine output force is tried on the road of the good sample car of this vehicle technology status and load as standard, promptly F at conformity of production
t=F
1+ F
2+ F
eAs specified force, so, only need the good sample car of technology status of each vehicle is carried out the SR F that the road examination detects each speed of a motor vehicle point
t, data input computing machine, any vehicle of this vehicle only needs bench teat to measure the SR F of each speed of a motor vehicle point
D, can accurately determine the turbine loading force F of each each speed of a motor vehicle point of operating mode in the various Performance Detection
bAs with the detection of car fuel consumption per hundred kilometers etc., allow to adopt computing method to determine that the road tries the F of each speed of a motor vehicle point
t, need not the road examination, only need to calculate F
t, bench teat is determined F then
DCan obtain the F of regulation speed of a motor vehicle point
b
4, because vehicle is a lot, examination workload in road is too big, and to the various Performance Detection of car the time, institute's inspection vehicle vehicle may not have data in the chassis dynamometer database.Because the technical parameter of different automobile types is more or less the same in same vehicle series, and all lower with the various Performance Detection speed of a motor vehicle of car, F
1The ratio that accounts for road test system resistance is less, so, F
tBe similar to and be directly proportional with the Reference mass of vehicle.So,, can obtain the SR COEFFICIENT K that each speed of a motor vehicle point is tried on each vehicle series sample car road in order to reduce road examination workload
t=F
t/ m, m are the Reference mass kg of sample car, K
tAs the technical parameter input computing machine of this vehicle series road examination, computing machine multiply by K to the Reference mass of same other vehicle of vehicle series
t, can be similar to the road test system resistance that obtains this each speed of a motor vehicle point of vehicle sample car, when fuel economy detected, m should be Reference mass and adds specified charge material amount; Equally, when sliding performance detects, also can be by sample car driving shaft quality G
1, obtain the bench test system resistance coefficient K of each speed of a motor vehicle point of each vehicle series sample car
D=F
D/ G
1, the driving shaft quality of same other vehicle of vehicle series be multiply by K
D, can be similar to the bench test system resistance that obtains this each speed of a motor vehicle point of vehicle sample car, the input computing machine.Thereby reduce road examination workload greatly, when guaranteeing accuracy of detection, improved operability greatly.
The system test method of automobile bench teat simulation road examination multi-state load has replaced original each several part resistance tests and calculating with the system test method, has advantages such as simple, accurate, quick.
Claims (7)
1, the system test method of automobile bench teat simulation road examination multi-state load, be automobile on chassis dynamometer, simulate road examination idling, acceleration, at the uniform velocity, during the decelerating mode load, determining and control of turbine loading force, it is characterized in that, when the various operating mode of the various Performance Detection of bench teat is carried out in the examination of simulative automobile road, adopt the system test method that try on the road and bench teat vehicle neutral gear slides, obtain the SR of road examination and each speed of a motor vehicle point of bench teat vehicle, accurately determine turbine loading force F at each speed of a motor vehicle point
bDemarcation by turbine, accurately load, as generalized case the detection step is described with automobile transient condition pollutant emission detection: (1) each vehicle is serial with a sample car that technology status is good, adopt free and twice coastdown of loading or twice coastdown of increase and decrease inertia, obtain the chassis power train equivalent inertia m of sample car
3, non-driving wheel equivalent inertia m
4, the equivalent inertia m of automobile power-transmission system
5, chassis dynamometer equivalent inertia m
2Bench test system resistance F with each speed of a motor vehicle point
D, the input computing machine is as the technical parameter of this vehicle series; (2) examination neutral gear in sample car road slides, by measuring the retarded velocity α of each speed of a motor vehicle point
1i, can get the SR F of each speed of a motor vehicle point of sample car bench teat
t=(m+m
3+ m
4) α
1i, m is the Reference mass kg of sample car, road examination and the difference F of bench teat at the SR of same speed of a motor vehicle point
t-F
D=(F
1+ F
2)-(F
c+ F
f) reflection be, institute's same vehicle of examining is at same speed of a motor vehicle point, windage resistance F is tried on the road
1, rolling resistance of wheel F
2Sum and bench teat chassis dynamometer self resistance F
c, wheel cylinder frictional resistance F
fThe difference of sum; Each speed of a motor vehicle point turbine loading force F when (3) accelerating mode is tried on bench teat simulation road
b=(F
1+ F
2+ F
e)-(F
c+ F
f+ F
e)+(m+m
4-m
2) α
2=F
t-F
D+ (m+m
4-m
2) α
2, F
eBe automobile chassis drive system resistance, α
2Be operating mode regulation acceleration, speed of a motor vehicle point changes, F
bAlso change; When (4) operating mode is tried at the uniform velocity on bench teat simulation road, α
2=0, F
b=F
t-F
D, the speed of a motor vehicle is constant, F
bAlso constant, when bench teat simulation road examination idling and decelerating mode, F
b=0; (5) demarcation of turbine loading force and control, respectively under each equilibrium temperature state of turbine, carry out the continuous current control loaded with Δ I as the exciting current increment at every turn, adjust vehicle accelerator and gear, the turbine loading force of each speed of a motor vehicle point when measuring continuous current, thereby can determine under the different equilibrium temperatures of turbine, corresponding relation between the controlled variable of the speed of a motor vehicle, loading force, electric current or correspondence, and input computing machine are during detection, measure the turbine Current Temperatures earlier, then according to the speed of a motor vehicle and corresponding F
b, computing 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, and at idling and decelerating mode, the turbine exciting current is zero, and in operating mode at the uniform velocity, need be pressed 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 1km/h or the some kilometers speed of a motor vehicle at interval as variable load speed of a motor vehicle point, about the instantaneous speed of a motor vehicle of survey is less than variable load 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 system test method of the described automobile bench teat simulation of claim 1 road examination multi-state load, it is characterized in that: press the definition of ASM operating condition method, at the turbine loading force F of regulation operating mode speed of a motor vehicle point
b=F
tλ+(m+m
4+ m
5) α
2λ-F
D, λ is the number percent of operating mode regulation power, the bench teat stable state is at the uniform velocity simulated, and needs F
bThe constant force FEEDBACK CONTROL.
3, according to the system test method of the described automobile bench teat of claim 1 simulation road examination multi-state load, it is characterized in that: when automobile carries out fuel consumption per hundred kilometers at the uniform velocity operating mode detects, α
2=0, F
b=(F
1+ F
2+ F
e)-(F
c+ F
f+ F
e), (F
1+ F
2+ F
e) be that sample car road examination neutral gear under the state of burden rating slides the SR that institute's gauge is decided speed of a motor vehicle point, standard allows to calculate this road test system resistance, and (F
c+ F
f+ F
e) be that the unloaded bench teat neutral gear of vehicle that same model is examined slides the SR that institute's gauge is decided speed of a motor vehicle point.
4, according to the system test method of the described automobile bench teat simulation of claim 1 road examination multi-state load, it is characterized in that: bench teat equivalent simulation road examination coasting distance detects, the inspection vehicle bench teat equivalence road examination coasting distance L ' of institute
t=K
m∑ K
FL
1D, can establish K
mBe inertia correction factor, K
m=(m+m
3+ m
4)/(m
2+ m
3), K
FBe SR correction factor, K
F=F
1D/ (F
t-F
D-F
1D), F in the formula
1DBe the SR of institute's each speed of a motor vehicle point of inspection vehicle bench teat, F
t, F
DBeing respectively each speed of a motor vehicle dot system resistance of examination of sample car road and bench teat, is the given value of input computing machine, L
1DFor bench teat in each speed of a motor vehicle interval from V
I+1To V
I-1Institute's inspection vehicle coasting distance; As at each speed of a motor vehicle point of low speed
KF changes when little, desirable each speed of a motor vehicle point K
FMean value K replace the K of each speed of a motor vehicle point
F, L ' then
t=K
mKL '
1D, L '
1DFor institute's inspection vehicle bench teat from V
0Slide the coasting distance when the speed of a motor vehicle is zero; Not high as accuracy requirement, also can ignore m
3And m
4Influence, make K
m=m/m
2
5, try the system test method of multi-state load according to the described automobile bench teat simulation of claim 1 road, it is characterized in that: when the service check that carries out the automobile type approval and very high simulation precision require, should determine same vehicle again after bench teat and the road examination turbine loading force of each speed of a motor vehicle point respectively.
6, try the system test method of multi-state load according to the described automobile bench teat simulation of claim 1 road, it is characterized in that: same vehicle is in the conformity of production detection with when carrying out various Performance Detection with car, normally the road of a good sample car of technology status of this vehicle examination regulation operating mode engine output force is loaded as standard, promptly F
t=F
1+ F
2+ F
eAs specified force, so, only need sample car of each vehicle is carried out the SR F that the road examination detects each speed of a motor vehicle point
t, data input computing machine, any vehicle of this vehicle only needs bench teat to measure the SR F of each speed of a motor vehicle point
D, can accurately determine the turbine loading force F of each each speed of a motor vehicle point of operating mode in the various Performance Detection of this vehicle
b
7, according to the system test method of claim 1,2,3,4,6 described automobile bench teat simulation road examination multi-state load, it is characterized in that:, can obtain the SR COEFFICIENT K that each speed of a motor vehicle point is tried on each vehicle series sample car road in order to reduce road examination workload
t=F
t/ m, m are the Reference mass kg of sample car, K
tAs the technical parameter input computing machine of this vehicle series road examination, computing machine multiply by K to the Reference mass of same other vehicle of vehicle series
t, can be similar to the road test system resistance that obtains this each speed of a motor vehicle point of vehicle sample car, when fuel economy detected, m should be Reference mass and adds specified charge material amount; Equally, when sliding performance detects, also can be by sample car driving shaft quality G
1, obtain the bench test system resistance coefficient K of each speed of a motor vehicle point of each vehicle series sample car
D=F
D/ G
1, the driving shaft quality of same other vehicle of vehicle series be multiply by K
D, can be similar to the bench test system resistance that obtains this each speed of a motor vehicle point of vehicle sample car, the input computing machine.
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