CN100387956C - Fast automobile ergometric method on chassis ergometer - Google Patents
Fast automobile ergometric method on chassis ergometer Download PDFInfo
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- CN100387956C CN100387956C CNB021089272A CN02108927A CN100387956C CN 100387956 C CN100387956 C CN 100387956C CN B021089272 A CNB021089272 A CN B021089272A CN 02108927 A CN02108927 A CN 02108927A CN 100387956 C CN100387956 C CN 100387956C
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- speed
- motor vehicle
- power
- automobile
- chassis
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Abstract
The present invention relates to a rapid power measuring method for automobile on a chassis dynamometer. An automobile is combined with an inertial flywheel on a loaded chassis dynamometer, the throttle is rapidly trod to the maximum, the maximal throttle position is kept, and two automobile speed points corresponding to the maximal torque and the maximal power of the engine are determined by detecting inertial dynamic power. The inertial flywheel is then detached, the loaded static power detection is carried out at the two automobile speeds, the system loss power of the two automobile speeds is obtained by increasing and reducing inertia for slide twice, and thereby, the pure outer power of the engine at the two automobile speeds is obtained. The present invention has the advantages of simple operation, accurate detection, quickness, etc.
Description
Fast automobile ergometric method on chassis ergometer: automobile is on the loaded type chassis dynamometer, carrying out the dynamic output power of engine earlier detects, obtain the maximum engine torque point speed of a motor vehicle and the rated power point speed of a motor vehicle, then, under this two speed of a motor vehicle, load steady state power detection or diesel vehicle and load the detection of deceleration toxic emission smoke intensity, belong to bench teat automotive performance detection method technical field.
At present, automobile in the greatest problem of the enterprising action edge detection of chassis dynamometer is: how to determine that maximum engine torque point and rating of engine put the corresponding speed of a motor vehicle.Several method is arranged usually: a kind of method is according to engine speed, chassis power train ratio of gear and wheel diameter carry out Theoretical Calculation and determine two speed of a motor vehicle, owing to the diversity of vehicle with in the complicacy with driving skills art situation, this method and actual conditions error are very big.Another kind method is to adopt speed of a motor vehicle pointwise detection method, detects curve such as whole chassis output and determines speed of a motor vehicle point, and this method is long detection time, and turbine is easily overheated, is difficult to apply to the detection at the usefulness car.Also having a kind of method is exactly that (number of patent application: 01124629.4) this method needs 3 points of steady state measurement, and this method is not suitable for gasoline car for my patent application " fast ergometry method with ergometer on chassis of diesel fuel vehicle ".The present invention will overcome above deficiency.
Method of the present invention and step are as follows:
1, on the cylinder of automobile at chassis dynamometer, the inertial flywheel of binding chassis dynamometer machine, after hanging up direct high the speed of a motor vehicle is stabilized in about 25km/h, urgency is stepped on the gas on earth and is stabilized in the maximum throttle position then, the output power of engine is soon near its external characteristic curve, under the effect of SR and system inertia, the whole accelerator time is longer relatively, by measuring each vehicle velocity V
iInstantaneous acceleration a
iSo, can get engine dynamic driving power F
i=ma
iN and dynamic power P
i=ma
iV
i/ 3600kW
M---the equivalent inertia kg of system
a
i---the instantaneous acceleration m/s of each speed of a motor vehicle point
2
v
i---speed of a motor vehicle km/h
And obtain the dynamic driving power and the dynamic power curve of engine thus.
2, after the speed of a motor vehicle surpasses the rating of engine point speed of a motor vehicle, the pine tar door is hung neutral gear, appoints system to slide, and measures each speed of a motor vehicle point V
iInstantaneous retarded velocity a
LiM/s
2So, can get the resistance and the loss power of system:
F
1i＝m·a
1i N，P
1i＝m·a
li·V
i/3600kW
If 3 are defined as m to the equivalent inertia sum of chassis dynamometer and automobile chassis drive system, at identical speed of a motor vehicle point V
i, can get the dynamic output drive strength F of engine
2iWith dynamic output power P
2i
F
2i＝F
i+F
1i＝m·(a
i+a
1i)N
P
2i＝P
i+P
1i＝m·V
i·(a
i+a
1i)/3600kW
F
2iAnd P
2iCurve approximation is parallel to the torque curve and the powertrace of engine test bench characteristic, F
2iAnd P
2iPeaked 2 speed of a motor vehicle points are put corresponding two speed of a motor vehicle approximately equals with maximum engine torque point and rated power.
4, because system inertia m is approximately constant at each speed of a motor vehicle point, so it is that it doesn't matter that the size of m value is put two speed of a motor vehicle for computing machine searching maximum engine torque point and rated power, so, can substitution in calculating m value arbitrarily.Promptly can formula and curve
F′
2i＝a
i+a
1i，P′
2i＝(a
i+a
1i)·V
i
Come maximizing F '
2maxAnd P '
2maxCorresponding speed of a motor vehicle point.
5, from P '
2iIn can obtain the speed of a motor vehicle point of certain percentage rate δ constant engine output power, i.e. δ P '
2maxCorresponding speed of a motor vehicle point.
The inertial flywheel of 6, throwing off chassis dynamometer, adopt constant-speed control system, detection of engine maximum torque point and rated power are put the maximum throttle stable state dynamometer machine indicated power under two speed of a motor vehicle respectively, dynamometer machine unloading then, allow the speed of a motor vehicle raise above behind the rated power speed of a motor vehicle point, the pine tar door is hung neutral gear, appoint system's art skating, by twice coastdown of increase and decrease inertia (also can and load twice coastdown) by freedom, can obtain the system loss power of 2 speed of a motor vehicle points, add the indicated power of being surveyed, promptly obtain the engine output net power of 2 speed of a motor vehicle points.
This method is determined the maximum engine torque and corresponding two speed of a motor vehicle of rated power by detecting inertia dynamic driving power and dynamic power, under this two speed of a motor vehicle, load then and carry out the stable state measurement of power, detect simultaneously the system loss power of two speed of a motor vehicle again, obtained the engine output net power of 2 speed of a motor vehicle points at last.Be applicable to that vehicle inspection and test station and Auto repair shop are to carrying out dynamic property detection or the detection of diesel vehicle loading deceleration toxic emission smoke intensity fast with car.Have advantages such as simple to operate, that detection is accurate, quick.
Claims (1)
1. fast automobile ergometric method on chassis ergometer, be that automobile is on the loaded type chassis dynamometer, determine to detect operating mode regulation speed of a motor vehicle point fast, carry out detection of constant speed steady state power or toxic emission and detect, the invention is characterized in: by the instantaneous acceleration a of each speed of a motor vehicle point of measuring system
iThe instantaneous retarded velocity a that slides with neutral gear
1i, system's equivalent inertia is defined as chassis dynamometer equivalent inertia and automobile chassis drive system equivalent inertia sum, obtain the dynamic output drive strength F of engine
2iWith dynamic output power P
2iAnd response curve, the speed of a motor vehicle point of both maximal value correspondences and maximum engine torque and rated power two speed of a motor vehicle approximately equals are because system inertia m is approximately constant at each speed of a motor vehicle point, so the size of m value is for seeking F
2iAnd P
2iThe corresponding speed of a motor vehicle of maximal value it doesn't matter, can be from F '
2iAnd P '
2iMaximizing in the formula, the speed of a motor vehicle of maximal value correspondence approximates the maximum engine torque speed of a motor vehicle and the rated power speed of a motor vehicle respectively, and can obtain the corresponding speed of a motor vehicle point of certain percentage rate δ constant engine output power, operating mode speed of a motor vehicle point carries out steady state power detection or diesel vehicle loading deceleration toxic emission detection fast in accordance with regulations.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021089272A CN100387956C (en) | 2002-04-06 | 2002-04-06 | Fast automobile ergometric method on chassis ergometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021089272A CN100387956C (en) | 2002-04-06 | 2002-04-06 | Fast automobile ergometric method on chassis ergometer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1441234A CN1441234A (en) | 2003-09-10 |
| CN100387956C true CN100387956C (en) | 2008-05-14 |
Family
ID=27768513
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021089272A Expired - Fee Related CN100387956C (en) | 2002-04-06 | 2002-04-06 | Fast automobile ergometric method on chassis ergometer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100387956C (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1336537A (en) * | 2001-07-27 | 2002-02-20 | 吴明 | Fast ergometry method with ergometer on chassis of diesel fuel vehicle |
-
2002
- 2002-04-06 CN CNB021089272A patent/CN100387956C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1336537A (en) * | 2001-07-27 | 2002-02-20 | 吴明 | Fast ergometry method with ergometer on chassis of diesel fuel vehicle |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1441234A (en) | 2003-09-10 |
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| C06 | Publication | ||
| PB01 | Publication | ||
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| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080514 Termination date: 20110406 |