CN1525150A - Method for equivalently simulating and detecting automobile skidding distance on chassis dynamometer - Google Patents
Method for equivalently simulating and detecting automobile skidding distance on chassis dynamometer Download PDFInfo
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- CN1525150A CN1525150A CNA031542239A CN03154223A CN1525150A CN 1525150 A CN1525150 A CN 1525150A CN A031542239 A CNA031542239 A CN A031542239A CN 03154223 A CN03154223 A CN 03154223A CN 1525150 A CN1525150 A CN 1525150A
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- inertia
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- chassis dynamometer
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- vehicle
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Abstract
The invention discloses a method of equivalent simulating and detecting automobile sliding distance on the chassis dynamometer, when detecting, it need not make equivalent inertia of the dynamometer meet the corresponding equivalent inertia of the vehicle detect, firstly detecting the vehicle's sliding distance on the dynamometer from initial speed V0 to final speed 0, according to work-energy principle, converting to obtain the equivalent sliding distance of simulating the whole vehicle's equivalent inertia, adopting neutral gear freely or loading twice sliding method or inertia increasing-decreasing twice sliding method to be able to complete detecting, and if the computer has automatically retained the equivalent inertia of neutral gear chassis driving system of the detected vehicle's motorcycle type, primary sliding can complete the detecting and automatically complete detecting at the same of detecting the system's loss power.
Description
Technical field
Patent of the present invention is that automobile carries out a kind of equivalent simulation method that coasting distance detects on chassis dynamometer, belongs to bench teat automotive performance detection technique field.
Background technology
Detect in the coasting distance at GB GB18565-2001 " the commerial vehicle combination property requires and the method for inspection " the 12nd, 5,1 usefulness chassis dynamometer, 12nd, 5,1,2 sections of regulations: " select the corresponding equivalent inertia of chassis dynamometer according to the Reference mass of testing automobile; when the inertia progression of the fly wheel system that chassis dynamometer was equipped with can not accurately satisfy the equivalent inertia needs of testing automobile; can match and the immediate moment of inertia level of testing automobile kerb weight, but the reply testing result being done necessary correction ".Because the model of automobile is various, it is very big that Reference mass differs, be subjected to the restriction of structure and operation, even adopt numerous flywheel structures also to be difficult to satisfy the Automobile Detection of various different Reference mass, the existing chassis dynamometer of producing of China has only an inertial flywheel usually, can't satisfy the detection requirement of numerous vehicles at all, adopt the method for revising to be difficult to satisfy accuracy of detection usually.
Summary of the invention
Because the automobile slide distance is an overall target of automobile chassis drive system technology status, it is the big event that comprehensive vehicle performance detects, on the chassis dynamometer of an existing inertial flywheel, carry out the automobile slide distance detecting, can't satisfy the desired inertia requirement of standard at all, even adopt many flywheels also to be difficult to satisfy the requirement of numerous vehicles, adopt empirical modification method to be difficult to satisfy the accuracy of detection requirement.The invention provides a kind of simply, fast, the chassis dynamometer coasting distance equivalent simulation detection method of getting on the car accurately.
Supposing has a big flywheel on the chassis dynamometer main drum shaft, the equivalent inertia of chassis dynamometer system is just in time simulated the corresponding equivalent inertia of institute's inspection vehicle fully, when vehicle slides, in a very little speed of a motor vehicle interval, can get following formula according to the principle of work and power
0.5(m+mz)V
2 i+1-0.5(m+mz)V
2 i-1＝F
i·L
i……………(1)
The corresponding equivalent inertia of vehicle that m-examines (equal the vehicle Reference mass and add the non-driving wheel equivalent inertia) kg
Mz-automobile neutral gear transmission system of chassis equivalent inertia kg
V
I+1, V
I-1The speed of a motor vehicle m/s that-Di i+1 and i-1 are 2
F
i-Di i point, i.e. V
iThe SR of point, N V
i=(V
I+1+ V
I-1)/2
L
i-from V
I+1Slide to V
I-1The time coasting distance m
F
iBe at V
iSpeed of a motor vehicle point, vehicle transmission system resistance, wheel and roll friction resistance, chassis dynamometer resistance three sum.
Suppose big flywheel is changed into small flywheel, system's equivalent inertia of chassis dynamometer is m
1, in the process of sliding then
0.5(m
1+mz)V
2 i+1-0.5(m
1+mz)V
2 i-1＝F
1i·L
1i……(2)
F
1iI point during-small flywheel, i.e. V
iThe SR N of point
L
1iDuring-small flywheel from V
I+1Slide to V
I-1The time coasting distance m
Ignore the minor impact of different mass flywheels, at identical speed of a motor vehicle point, F to the chassis dynamometer resistance
i=F
1i
(1) formula gets except that (2) formula: (m+mz)/and (m
1+ mz)=L
i/ L
1i
So, L
i=L
1i(m+mz)/(m
1+ mz)
This relational expression is set up in each speed of a motor vehicle minizone, from initial velocity Vo slide to the speed of a motor vehicle be 0, the addition accumulation can get: L=L
1(m+mz)/(m
1+ mz) ... (3)
The equivalent coasting distance m of L-simulation car load inertia
L
1-vehicle is m at inertia
1Chassis dynamometer on from initial velocity Vo slide to the speed of a motor vehicle be 0 apart from m
It is whether qualified that L and standard limited value are relatively judged.
Embodiment
In (3) formula, L
1Be detected value, automobile neutral gear on chassis dynamometer slides, and when the speed of a motor vehicle is reduced to regulation initial velocity Vo, begins to measure coasting distance, is 0 until the speed of a motor vehicle.
M can weigh and obtain vehicle Reference mass G by each, adds the about 3%G of non-driving wheel equivalent inertia, m=1.03G.
m
1Being used chassis dynamometer system equivalent inertia, is one of technical parameter of chassis dynamometer, can record by methods such as freedom, twice coastdown of loading or twice coastdowns of increase and decrease inertia.
Mz is institute's inspection vehicle neutral gear chassis power train equivalent inertia, can obtain the equivalent inertia of system, the resistance and the loss power of each speed of a motor vehicle point by neutral gear freedom, twice coastdown of loading or twice coastdown of increase and decrease inertia, and the equivalent inertia of system deducts m
1Promptly obtain mz.So, only need to adopt to slide just can detect for twice to obtain L; Automatically, kept the mz of each vehicle when computing machine after, only need slide once can detect and obtain L; If in dynamic property detects, during twice skid detection loss power, then can in twice is slided, detect mz automatically and calculate L, need not to carry out in addition again coasting distance and detect.
Outstanding feature of the present invention is: be applicable to that carrying out various vehicle coasting distances on an any inertial flywheel chassis dynamometer detects, during detection, need not to make the equivalent inertia of chassis dynamometer to be at or about the equivalent inertia of institute's inspection automobile.The accuracy of detection height, convenient and simple for operation, quick.
Claims (3)
1, equivalent analog detection automobile slide distance method on the chassis dynamometer, be that automobile carries out the coasting distance detection method on chassis dynamometer, it is characterized in that, slide when detecting, need not to make the equivalent inertia of chassis dynamometer to be at or about the corresponding equivalent inertia of institute's inspection vehicle, detect vehicle earlier at fixing inertia m
1Chassis dynamometer on to slide to the speed of a motor vehicle from initial velocity Vo be 0 distance L
1, ignore of the influence of different flywheel inertias to the SR sum, according to the principle of work and power, can obtain simulating the equivalent coasting distance L=L of car load equivalent inertia
1(m+mz)/(m
1+ mz), then with standard limited value relatively judge whether qualified.
2, equivalent analog detection automobile slide distance method on the chassis dynamometer according to claim 1 is characterized in that, can be by automobile each weigh and obtain the corresponding equivalent inertia m of institute's inspection vehicle; Can determine chassis dynamometer system equivalent inertia m by freedom, twice coastdown of loading or twice coastdown of increase and decrease inertia
1, and as one of technical parameter of chassis dynamometer; Can detect the equivalent inertia of the system that obtains by freedom, twice coastdown of loading or twice coastdown of increase and decrease inertia, deduct m
1, promptly obtain mz.
3, equivalent analog detection automobile slide distance method on the chassis dynamometer according to claim 1 is characterized in that, adopts to slide for twice just can detect to obtain L; After computing machine has kept the mz of each vehicle automatically, only need slide once can detect and obtain L; If in dynamic property detects, during twice skid detection loss power, then can in twice is slided, detect mz automatically and calculate L, need not to carry out in addition again the coasting distance detection.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031542239A CN1525150A (en) | 2003-08-03 | 2003-08-03 | Method for equivalently simulating and detecting automobile skidding distance on chassis dynamometer |
| CN 200410048690 CN1276247C (en) | 2003-08-03 | 2004-06-10 | Method for detecting automobile slide distance by equivalent analogue in chassis dynamometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031542239A CN1525150A (en) | 2003-08-03 | 2003-08-03 | Method for equivalently simulating and detecting automobile skidding distance on chassis dynamometer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1525150A true CN1525150A (en) | 2004-09-01 |
Family
ID=34287070
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA031542239A Pending CN1525150A (en) | 2003-08-03 | 2003-08-03 | Method for equivalently simulating and detecting automobile skidding distance on chassis dynamometer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1525150A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100516802C (en) * | 2005-12-16 | 2009-07-22 | 比亚迪股份有限公司 | Inertia determination of automobile |
| CN104198196A (en) * | 2014-08-28 | 2014-12-10 | 吴明 | Method for detecting equivalent inertia of rotating parts of automobile and engine |
-
2003
- 2003-08-03 CN CNA031542239A patent/CN1525150A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100516802C (en) * | 2005-12-16 | 2009-07-22 | 比亚迪股份有限公司 | Inertia determination of automobile |
| CN104198196A (en) * | 2014-08-28 | 2014-12-10 | 吴明 | Method for detecting equivalent inertia of rotating parts of automobile and engine |
| CN104198196B (en) * | 2014-08-28 | 2017-01-11 | 吴明 | Method for detecting equivalent inertia of rotating parts of automobile and engine |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |