CN101937005B - Method for detecting rated power vehicle speed of diesel vehicle - Google Patents
Method for detecting rated power vehicle speed of diesel vehicle Download PDFInfo
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- CN101937005B CN101937005B CN2010102456190A CN201010245619A CN101937005B CN 101937005 B CN101937005 B CN 101937005B CN 2010102456190 A CN2010102456190 A CN 2010102456190A CN 201010245619 A CN201010245619 A CN 201010245619A CN 101937005 B CN101937005 B CN 101937005B
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000000418 atomic force spectrum Methods 0.000 claims abstract description 4
- 238000001514 detection method Methods 0.000 claims description 16
- 230000001133 acceleration Effects 0.000 claims description 14
- 238000010521 absorption reaction Methods 0.000 claims description 4
- 239000007789 gas Substances 0.000 claims description 4
- 239000002912 waste gas Substances 0.000 claims description 4
- 230000004913 activation Effects 0.000 claims description 3
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 239000000446 fuel Substances 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
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Abstract
The invention discloses a method for detecting rated power vehicle speed of a diesel vehicle, comprising the following steps of: setting a vehicle speed at a speed regulation curve section, a drive force curve and a vehicle speed, and a drive power curve to be a straight line; detecting maximum speed Va of the diesel vehicle on a chassis dynamometer machine; detecting a point b at the speed regulation curve section; detecting a point c on an external characteristic curve section; and obtaining drive forces Fb and Fc, drive powers Pb and Pc and vehicle speeds Vb and Vc of the point b and the point c by using single vehicle speed steady detectable power or inertia dynamic scanning power or double vehicle speed steady detectable power, and obtaining drive force slope KF based on calculation of the driving forces, and calculating to obtain rated power vehicle speed Vd; and obtaining drive power slope KP based on the calculation of the drive power and calculating to obtain rated power vehicle speed Vd. If the precision of the rated power vehicle speed requires not too high, Vd=QxVa can be calculated according to the set percentage Q.
Description
Technical field
Diesel vehicle rated power method for detecting vehicle speed; Be that diesel vehicle is when enterprising action edge property detection of chassis dynamometer or the detection of underlug-down mode method waste gas; With the accurately quick a kind of detection method of confirming the diesel vehicle rated power speed of a motor vehicle of rate of curve, belong to automotive performance bench teat detection technique field.
Background technology
At present; When diesel vehicle carries out underlug-down mode method toxic emission detection on chassis dynamometer; Need accurately to seek the actual rated power rotating speed of diesel engine; The diesel engine high-pressure jetting pump speed regulating machine at a high speed will acting rotating speed when being the maximum throttle pedal position, and limits error that the relative instructions of actual rated power rotating speed indicates the rated power rotating speed within the specific limits, thereby guarantees that diesel engine carries out waste gas and detects under the technical parameter normal condition.Prior art is sought the actual specified Power Vehicle speed of diesel vehicle V
dFollowing several method is arranged:
1, adopt speed of a motor vehicle pointwise to load scanning method, with the corresponding speed of a motor vehicle of maximum wheel power as V
d, this method is long detection time, and it is overheated that the current vortex machine is prone to, and bigger with the maximum wheel power speed of a motor vehicle of car corresponding engine speed and real engine rated power speed error, be prone to cause the misjudgement of engine speed.
2, adopt three speed of a motor vehicle of I invent multi " fast ergometry method with ergometer on chassis of diesel fuel vehicle " to load the stable state parametric method; Need stable state to load the driving force that constant speed is measured 3 speed of a motor vehicle points; The current vortex machine load time is longer relatively; The load of current vortex machine is also bigger, is prone to increase the temperature rise of current vortex machine.
3, adopt the inertia dynamic method of I invent multi " fast automobile ergometric method on chassis ergometer ", this method can be suitable for dynamic property and detect, because existing diesel vehicle dynamic property examination criteria, has only power limit and does not have the rated speed limit value.Because with the engine speed of the maximum wheel power speed of a motor vehicle correspondence of car and be not equal to real engine rated power rotating speed, so the inapplicable accurate detection diesel engine rated power speed of a motor vehicle of this method.
For overcoming the deficiency of prior art; Improve diesel vehicle detects the rated power speed of a motor vehicle on chassis dynamometer accuracy, reduce the load time and reduction load of current vortex machine as far as possible, reduce the temperature rise of air-cooled current vortex machine; Improve detection efficiency, innovated this method.
Summary of the invention
When the diesel vehicle rated power speed of a motor vehicle equaled the maximum throttle pedal position, the diesel engine high-pressure jetting pump speed regulating machine corresponding speed of a motor vehicle of rotating speed that will work at a high speed was after this speed of a motor vehicle; Speed regulator begins to work, and reduces fuel delivery automatically, and it is many more to exceed the speed limit; Fuel delivery is more little, and the diesel vehicle driving force is more little, in speed governing segment of curve vehicle speed range; Engine output torque or diesel vehicle driving force and the speed of a motor vehicle are approximated to linear inverse ratio; The speed of a motor vehicle, activation force profile are approximately straight line, and the speed of a motor vehicle, driving power also are approximately straight line, can confirm the rated power speed V through the rate of curve of calculating the speed governing segment of curve
d
Diesel vehicle rated power method for detecting vehicle speed; Be that diesel vehicle is when enterprising action edge property detection of chassis dynamometer or the detection of underlug-down mode method waste gas; Accurately quick a kind of detection method of confirming the actual specified Power Vehicle speed of diesel vehicle; The speed of a motor vehicle, activation force profile and the speed of a motor vehicle, the driving power curve that are set in the speed governing segment of curve all are straight line; Through measuring the relevant speed of a motor vehicle, driving force, the driving power of diesel vehicle full engine load operating mode, calculate the rated power speed V with the rate of curve of driving force or the driving power and the speed of a motor vehicle
dDiesel vehicle is on chassis dynamometer, and device for power absorption does not load, and floors gas pedal after hanging up the regulation gear, detects the max. speed V of diesel vehicle on chassis dynamometer
a, establish this speed of a motor vehicle point driving force F
aBe 0; Confirm the b point at the speed governing segment of curve, at (89%～95%) * V
aSet V in the scope
bValue is confirmed the c point, at (80%～88%) * V on the external characteristic curve section
aSet V in the scope
CValue adopts bicycle speed stable state power scale or inertia dynamic scan power or two speed of a motor vehicle stable state power scales, obtains the driving force F that b is ordered
b, driving power P
bAnd V
b, obtain the driving force F that c is ordered
c, driving power P
cAnd V
cAs calculating, obtain the driving force slope K with driving force
F=F
b/ (V
a-V
b), V
a-V
d=F
c/ K
F=F
c* (V
a-V
b)/F
b, V
d=V
a-F
c* (V
a-V
b)/F
bAs calculating, obtain the driving power slope K with driving power
P=P
b/ (V
a-V
b), V
a-V
d=P
c/ K
P=P
c* (V
a-V
b)/P
b, V
d=V
a-P
c* (V
a-V
b)/P
bIf rated power speed of a motor vehicle precision prescribed is not high, can detect V as stated above earlier
a, selected number percent Q in 82%～94% scope calculates V by setting number percent Q then
d=Q * V
aReferring to Figure of description, its mode and step are following:
1, two speed of a motor vehicle stable state power scales are confirmed a, b, 3 parameters of c
(1) diesel vehicle is on chassis dynamometer, and device for power absorption does not load, hang up behind the regulation gear floor gas pedal after, detect the max. speed V of diesel vehicle on chassis dynamometer
a, establish the F of this speed of a motor vehicle point
aBe 0.
(2) confirm the b point at the speed governing segment of curve, at (89%～95%) * V
aSet V in the scope
bValue is confirmed the c point, at (80%～88%) * V on the external characteristic curve section
aSet V in the scope
CValue is respectively at V
bAnd V
cTwo speed of a motor vehicle point constant speed stable state power scales obtain the driving force F that b is ordered
b, driving power P
bAnd V
b, obtain the driving force F that c is ordered
c, driving power P
cAnd V
cThen by the driving force slope K
FOr driving power slope K
PCalculate V
d
2, inertia dynamic scan power is confirmed a, b, 3 parameters of c
(1) on the cylinder of diesel vehicle at chassis dynamometer; Be stabilized in the speed of a motor vehicle about 20km/h after hanging up the regulation top gear; Anxious then accelerator pedal on earth and be stabilized in the maximum throttle position; The output torque of engine and power are soon near its external characteristic curve, under the load of system inertia, through measuring each speed V
I+1, V
I-1With corresponding time t
I+1, t
I-1, obtain median speed V
iInstantaneous inertial acceleration a
iSo, obtain the dynamic inertia-activated power F of each median speed point
i=m * a
i, N and dynamic inertia power P
i=m * a
i* V
i/ 3600, kW,
M-vehicle, chassis dynamometer system equivalent inertia kg;
a
iThe instantaneous acceleration m/s of-each median speed point
2
V
iThe interval median speed km/h of-each speed of a motor vehicle;
(2) on chassis dynamometer, reach the maximum stable speed V when diesel vehicle
aAfter, this moment, the system inertia acceleration was 0, V
aSpeed of a motor vehicle point inertia-activated power F
a=0, it is constant to establish m, and the m that in calculating, divided out need not to calculate the driving force of each speed of a motor vehicle point and the concrete value of driving power, can K
F=Δ a
i/ Δ V, K
P=Δ (a
i* v
i)/Δ V comes slope calculations.
(3) at speed governing line segment (89%～95%) V
aConfirm V in the scope
bValue is at external characteristic curve section (80%～88%) V
aConfirm V in the scope
CValue obtains V
bThe acceleration a of point
b, inertia-activated power F
bWith the inertia-activated power P
b, obtain V
cThe acceleration a of point
c, inertia-activated power F
cWith the inertia-activated power P
c
(4) calculate K with inertia-activated power
F=F
b/ (V
a-V
b), V
a-V
d=F
c/ K
F=F
c* (V
a-V
b)/F
b=m * a
c* (V
a-V
b)/(m * a
b)=a
c* (V
a-V
b)/a
bSo,, V
d=V
a-a
c* (V
a-V
b)/a
bWith inertia-activated power calculation, K
P=P
b/ (V
a-V
b), so, V
d=V
a-P
c* (V
a-V
b)/P
b=V
a-a
c* V
c* (V
a-V
b)/(a
b* V
b).
3, bicycle speed stable state power scale is confirmed a, b, 3 parameters of c
(1) diesel vehicle is on chassis dynamometer, and device for power absorption does not load, and floors gas pedal after hanging up the regulation gear, detects the max. speed V of diesel vehicle on chassis dynamometer
a, this speed of a motor vehicle point F
aBe 0.
(2) at speed governing segment of curve (89%～95%) V
aConfirm V in the scope
bValue is at V
bSpeed of a motor vehicle constant speed stable state detects and obtains the driving force F that b is ordered
b, driving power P
bAnd V
b, the loss power of removal stand and diesel vehicle total system is established automobile driving wheel output net power P
PAt (60%～95%) P
eIn the scope, P
eBe rating of engine, calculate P by the number percent L that sets
P=L * P
e, perhaps add up by the vehicle campaign and set P with reference to act.std
P/ P
ePower number percent L, use P
PReplace P
cCan get V
d=V
a-P
P* (V
a-V
b)/P
b, also can be by the speed of a motor vehicle at (80%～88%) V
aSet the corresponding speed of a motor vehicle in the scope, and calculate and set P
PIn the driving force of the corresponding speed of a motor vehicle, replace F with this driving force
cCalculate.
Set P
P/ P
ePower number percent L, can be with reference to table 1 among the act.std GB18565-2001 " commerial vehicle combination property require and the method for inspection ", the permission ratio η of the correction driving wheel output power/rated power of rated power operating mode
Pa, this ratio is to be 70% o'clock by vehicle campaign statistics rating of engine, the ratio of the output power of surveying on chassis dynamometer is so a need is at η
PaBenchmark on increase by 30% can set rating of engine corresponding output power and rated power on chassis dynamometer ratio L, see table 1
The setting power number percent of the various vehicle series of table 1.
The common desirable number percent less than normal of passenger vehicle, the desirable number percent bigger than normal of lorry, because speed governing section rate of curve is bigger, number percent bigger than normal is set P
PError cause V
dError and little, adopt number percent L bigger than normal to set P
P, can guarantee V with the car test survey
dOn external characteristic curve, overloading wagon high-pressure injection pump fuel delivery overshoot sometimes is bigger, and setting number percent should be bigger than normal.
4, statistics is confirmed V
d
The steady state speed governing rate of diesel engine for automobile is about 10%, according to test statistics, and the V that various diesel vehicles are surveyed on chassis dynamometer
dAt (82%～94%) V
aScope in, so, if rated power speed of a motor vehicle precision prescribed is not high, can be as stated above detect V earlier
a, selected number percent Q in 82%～94% scope calculates V by setting number percent Q then
d=Q * V
aUsually plunger type high-pressure injection pump number percent is bigger than normal, and distribute type high-pressure injection pump number percent is less than normal.The loss power of passenger vehicle and stand total system is relatively large, and passenger vehicle can be got number percent bigger than normal, and unloaded lorry can be got number percent less than normal.
Description of drawings
Figure of description Fig. 1 is the curve map of driving force, driving power and the speed of a motor vehicle of diesel vehicle on chassis dynamometer, and straight line 1 is the SR F of vehicle, chassis dynamometer
F, in the less vehicle speed range of speed governing segment of curve, can be similar to as constant resistance, straight line 1 is parallel with the x axle through a point, V
aBe vehicle maximum stable speed of a motor vehicle during the maximum throttle pedal position under this gear SR, V
bBe the speed of a motor vehicle on the speed governing segment of curve that in the specified percentage scope, sets of computing machine, V
cBe the speed of a motor vehicle on the external characteristic curve that in the specified percentage scope, sets of computing machine, straight line 2 is a, 2 lines of b, and straight line 3 was c point straight lines parallel with the x horizontal coordinate, and the d point is a straight line 2 and the intersection point of 3 liang of straight lines of straight line, the speed V of d point correspondence
dEqual the rated power speed of a motor vehicle, V
a, V
b, V
cBe to measure the speed of a motor vehicle, establish stabilizing speed V
aDriving force be zero, overlap through moving with straight line 1 on parallel the x horizontal coordinate.Dynamically inertia scans V
b, V
cCorresponding sense inertial acceleration is a
b, a
c, V
b, V
cCorresponding inertia-activated power is F
b=m * a
b, F
c=m * a
c, corresponding inertia-activated power is P
b=m * a
b* V
b/ 3600, P
c=m * a
c* V
c/ 3600.Curve 2 is curves of power or the power and the speed of a motor vehicle with curve 4, and curve 2 is speed governing section curves, and curve 4 is external characteristic curves, at V
b, V
c, two speed of a motor vehicle point stable state power scales, V
b, F
b, P
bAnd V
c, F
c, P
cIt is detected value.At bicycle speed V
bThe stable state power scale, V
b, F
b, P
bBe detected value, with the P that sets
PReplace P
c, perhaps with the P that sets
PSetting the power value replacement F that speed of a motor vehicle point calculates
c, slope is tg β.Horizontal ordinate is the speed of a motor vehicle, and unit is km/h, and ordinate is driving force F and driving power P.
Embodiment
Concerning with car; The rated speed point power of engine might not be wheel limit peak power, being lower than the rated power rotating speed usually with the corresponding engine speed of the car engine peak power speed of a motor vehicle, adds that the loss power curve of diesel vehicle and stand whole drive system is a quafric curve; If the passenger vehicle drive axle is heavier; System loss is more powerful, and the slope of quafric curve is also bigger, and maximum wheel power is further squinted to more slow-speed of revolution direction of engine.
1, two speed of a motor vehicle stable state power scales are confirmed the embodiment of a, b, 3 parameters of c
Directly keep off the maximum throttle pedal position with a passenger vehicle, the V that surveys
a=87.81km/h establishes V
b=0.94V
a=82.5km/h is at 82.5km/h constant speed stable state power scale F
b=1740N, P
b=39.9kW establishes V
c=0.84V
a=0.84 * 87.81=73.8km/h gets F at 73.8km/h constant speed power stabilize
c=2160N, P
c=44.3kW.With driving force slope calculating V
d=87.81-2160 * (87.81-82.5)/1740=81.2km/h; With driving power slope calculating, V
d=87.81-44.3 * (87.81-82.5)/39.9=81.9km/h.
2, inertia dynamic scan power is confirmed the embodiment of a, b, 3 parameters of c
With a distribute type high-pressure injection pump diesel vehicle directly retaining four retainings on the twin-roll chassis dynamometer, detect, when hanging up after four retainings are stabilized in the speed of a motor vehicle about 20km/h, anxious accelerator pedal is measured the acceleration of each speed of a motor vehicle point on earth, when the speed of a motor vehicle reaches stabilizing speed V
a=89.6km/h, computing machine calculate V automatically
b=0.93 V
a=0.93 * 89.6=83.3km/h, V
c=0.84 V
a=0.84 * 89.6=75.3km/h, and get near speed of a motor vehicle point V
b=83.1, V
c=75.2, obtain the corresponding inertial acceleration a of 2 speed of a motor vehicle points
b=1.068m/s
2, a
c=1.875m/s
2Replace the driving force value with acceleration, with the product replacement driving power value of the acceleration and the speed of a motor vehicle.By the driving force slope calculating, V
d=89.6-1.875 * (89.6-83.1)/1.068=78.2km/h; Press the driving power slope calculating, V
d=89.6-1.875 * 75.2 * (89.6-83.1)/(1.068 * 83.1)=79.3km/h.
3, bicycle speed stable state power scale is confirmed the embodiment of a, b, 3 parameters of c
Directly keep off the maximum throttle pedal position with a passenger vehicle, the V that surveys
a=87.66km/h establishes V
b=0.94V
a=82.4km/h is at 82.4km/h constant speed stable state power scale F
b=1780N, P
b=40.7kW.
This passenger vehicle is 6700 series, and computing machine can automatic setting number percent be 65% by the vehicle series of table 1, P
P=0.65 * 85=55.3kW presses the driving power slope calculating, V
d=87.66-55.3 * (87.66-82.4)/40.7=80.5km/h.If by the driving force slope calculating, can be at (80%～88%) V
aConfirm V in the scope
C, the desirable number percent bigger than normal of passenger vehicle, as establish V
c=0.86 * 87.66=75.4km/h calculates F
c=3600 * P
P/ V
c=3600 * 55.3/75.4=2640N can get V
d=87.66-2640 * (87.66-82.4)/1780=79.9km/h.If setting number percent L is 75%, then V
d=87.66-0.75 * 85 * (87.66-82.4)/40.7=79.4km/h, promptly setting power number percent L increases 10%, V
dError is merely (79.4-80.5)/80.5=-1.4%.
4, statistics is confirmed V
dEmbodiment
Usually the steady state speed governing rate of diesel engine is about 10%, can be at V
d=(82%～94%) V
aSet number percent Q in the scope, it is 91% that the test passenger vehicle is got number percent Q bigger than normal, V
d=0.91 * 87.66=79.8km/h.
This method confirms that the diesel vehicle rated power speed of a motor vehicle has advantages such as accuracy height, good operability, and detection time is short, quick and easy, efficient is high, is applicable to detections such as diesel vehicle underlug-down mode method and dynamic property.
Claims (4)
1. diesel vehicle rated power method for detecting vehicle speed; Be that diesel vehicle is when enterprising action edge property detection of chassis dynamometer or the detection of underlug-down mode method waste gas; Confirm a kind of detection method of the diesel vehicle rated power speed of a motor vehicle; It is characterized in that: the speed of a motor vehicle, activation force profile and the speed of a motor vehicle, the driving power curve that are set in the speed governing segment of curve all are straight line; Through measuring the relevant speed of a motor vehicle, driving force, the driving power of diesel vehicle full engine load operating mode, calculate the rated power speed V with the rate of curve of driving force or the driving power and the speed of a motor vehicle
d, diesel vehicle is on chassis dynamometer, and device for power absorption does not load, and floors gas pedal after hanging up the regulation gear, detects the max. speed V of diesel vehicle on chassis dynamometer
aIf this speed of a motor vehicle point driving force F
aBe 0, confirm the b point at the speed governing segment of curve, at (89%～95%) * V
aSet b point speed V in the scope
bValue is confirmed the c point, at (80%～88%) * V on the external characteristic curve section
aSet c point speed V in the scope
CValue adopts bicycle speed stable state power scale or inertia dynamic scan power or two speed of a motor vehicle stable state power scales, obtains the driving force F that b is ordered
b, driving power P
bAnd V
b, obtain the driving force F that c is ordered
c, driving power P
cAnd V
c,, obtain the driving force slope K as calculating with driving force
F=F
b/ (V
a-V
b), V
d=V
a-F
c* (V
a-V
b)/F
b,, obtain the driving power slope K as calculating with driving power
P=P
b/ (V
a-V
b), V
d=V
a-P
c* (V
a-V
b)/P
bIf rated power speed of a motor vehicle precision prescribed is not high, detect V as stated above earlier
a, in 82%～94% scope, set number percent Q then, calculate V by setting number percent Q
d=Q * V
a
2. according to the described diesel vehicle rated power of claim 1 method for detecting vehicle speed, it is characterized in that: when adopting two speed of a motor vehicle stable state power scales to confirm a, b, 3 parameters of c, respectively at V
bAnd V
cTwo speed of a motor vehicle point constant speed stable state power scales obtain the driving force F that b is ordered
b, driving power P
bAnd V
b, obtain the driving force F that c is ordered
c, driving power P
cAnd V
c
3. according to the described diesel vehicle rated power of claim 1 method for detecting vehicle speed, it is characterized in that: when adopting the inertia dynamic scan to confirm a, b, 3 parameters of c, when diesel vehicle reaches the maximum stable speed V on chassis dynamometer
aAfter, obtain V
bThe acceleration a of point
b, driving force F
bWith driving power P
b, obtain V
cThe acceleration a of point
c, driving force F
cWith driving power P
c, m is constant for the system equivalent inertia of setting up departments, and the m that in calculating, divided out need not to calculate the driving force of each speed of a motor vehicle point and the concrete value of driving power, replaces the driving force value with acceleration, calculates with the product replacement driving power value of the acceleration and the speed of a motor vehicle.
4. according to the described diesel vehicle rated power of claim 1 method for detecting vehicle speed, it is characterized in that: when adopting bicycle speed stable state power scale to confirm a, b, 3 parameters of c, at speed governing segment of curve (89%～95%) V
aConfirm V in the scope
bValue is at V
bSpeed of a motor vehicle constant speed stable state records the driving force F that b is ordered
b, driving power P
bAnd V
b, establish automobile driving wheel output net power P
PAt (60%～95%) P
eIn the scope, P
eBe rating of engine, calculate P by the number percent L that sets
P=L * P
e, perhaps set P by vehicle campaign statistics with reference to act.std
P/ P
ePower number percent L, use P
PReplace P
cCan get V
d=V
a-P
P* (V
a-V
b)/P
b, also can be by the speed of a motor vehicle at (80%～88%) V
aSet the corresponding speed of a motor vehicle in the scope, and calculate and set P
PIn the driving force of the corresponding speed of a motor vehicle, replace F with this driving force
cCalculate.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102456190A CN101937005B (en) | 2010-06-10 | 2010-07-28 | Method for detecting rated power vehicle speed of diesel vehicle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010207930 | 2010-06-10 | ||
| CN201010207930.6 | 2010-06-10 | ||
| CN2010102456190A CN101937005B (en) | 2010-06-10 | 2010-07-28 | Method for detecting rated power vehicle speed of diesel vehicle |
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| Publication Number | Publication Date |
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| CN101937005A CN101937005A (en) | 2011-01-05 |
| CN101937005B true CN101937005B (en) | 2012-01-04 |
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| CN109115502B (en) * | 2018-08-22 | 2020-07-24 | 安徽江淮汽车集团股份有限公司 | Engine universal characteristic detection method and module |
| CN114228726B (en) * | 2021-11-25 | 2024-08-09 | 中联重科股份有限公司 | Control method, controller, control device and engineering equipment for engineering equipment |
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| CN1198125C (en) * | 2002-12-02 | 2005-04-20 | 吴明 | Automobile multi-working-condition simulation loading method on chassis dynamometer |
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