CN105571873A - Dual-opposed two-stroke engine external characteristic calibration method - Google Patents
Dual-opposed two-stroke engine external characteristic calibration method Download PDFInfo
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- CN105571873A CN105571873A CN201510934728.6A CN201510934728A CN105571873A CN 105571873 A CN105571873 A CN 105571873A CN 201510934728 A CN201510934728 A CN 201510934728A CN 105571873 A CN105571873 A CN 105571873A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
- G01M15/05—Testing internal-combustion engines by combined monitoring of two or more different engine parameters
Abstract
The invention provides a dual-opposed two-stroke engine external characteristic calibration method. A discrete point curve of change of power, torque and fuel consumption rate of a dual-opposed two-stroke engine to be measured along with change of rotating speed is derived by the calibration condition point and the maximum torque point power, rotating speed, fuel consumption rate and other related performance parameters of the dual-opposed two-stroke engine to be measured and the known two-stroke engine external characteristic data and the curve fitting theory, and external characteristic test calibration of the dual-opposed two-stroke engine to be measured is performed based on the acquired discrete point data so that the external characteristic curve of the engine to be measured is obtained, the process of repeated adjustment of the related parameters in external characteristic calibration by purely using the test method can be reduced, and research and development cost of the engine can be reduced.
Description
Technical field
The invention belongs to engine performance field, especially relate to a kind of biconjugate and put two-stroke engine external characteristics scaling method.
Background technology
Engine test bench characteristic represents its maximum power performance that can reach, to the type selecting of engine and complete machine coupling most important, domestic and international at present still belonged to the starting stage to the research and development that biconjugate puts two-stroke engine, without ripe engine, also there is no ripe system to the demarcation of engine, biconjugate is put two-stroke engine due to advantages such as its part are few and is had good development prospect.
The present invention is put the correlation performance parameters such as two-stroke engine declared working condition point and maximum torque point power, rotating speed, fuel consumption and known two-stroke engine external characteristics data and curve by biconjugate to be measured theoretical, derive biconjugate to be measured and put two-stroke engine power, moment of torsion, fuel consumption with the discrete point curve of rotation speed change, based on the discrete points data obtained, carry out biconjugate to be measured put two-stroke engine external characteristics Experimental Calibration, obtain the external characteristic curve of engine to be measured.
Summary of the invention
In view of this, the present invention is intended to propose a kind of biconjugate and puts two-stroke engine external characteristics scaling method, uses numerical fitting and tests the method combined, and obtains biconjugate to be measured fast and puts two-stroke engine external characteristic curve.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of biconjugate puts two-stroke engine external characteristics scaling method, comprises the following steps:
(1) correlation performance parameters that biconjugate to be measured puts two-stroke engine declared working condition point and maximum torque point and this declared working condition point and maximum torque point is measured;
(2) use known two-stroke engine external characteristics data and curve theory, derive the discrete point curve of correlation performance parameters with rotation speed change that biconjugate to be measured puts two-stroke engine;
(3) based on the discrete points data obtained, carry out biconjugate to be measured and put two-stroke engine external characteristics Experimental Calibration;
(4) data that real data test obtained and matching obtain compare, and difference is compared with degree of accuracy setting value, if difference exceedes degree of accuracy setting value, and number of comparisons is not more than setting measurement number of times, then carry out step (5), if difference exceedes degree of accuracy setting value, and number of comparisons is greater than setting measurement number of times, then number of comparisons resets and carries out step (6), if difference is within degree of accuracy range of set value, then carries out step (7);
(5) adjust automatically controlled correlation parameter, repeat step (3) to step (4), the data that actual measurement data and matching are obtained are as far as possible close;
(6) adjust the parameter value derived by fitting theory, repeat step (3) to step (4), the data that matching is obtained and actual measurement data are as far as possible close;
(7) the discrete point curve drawn by fitting theory in this measurement exports as the external characteristic curve of engine to be measured.
Further, the correlation performance parameters in described step (1) and step (2) comprises power, rotating speed and fuel consumption.
Further, the automatically controlled correlation parameter in described step (5) comprises injection advance angle, oil mass, rail pressure, pulsewidth, maximum permission pulsewidth.
Further, the maximum difference scope that the gross data that the experiment that the degree of accuracy setting value in described step (4) is equipment obtains data and this equipment allows relatively time, this degree of accuracy setting value shows the levels of precision of equipment gross data.
Further, the setting measurement number of times in described step (4) is stability for guaranteeing measurement result and thinks the pendulous frequency of setting.
Relative to prior art, biconjugate of the present invention is put two-stroke engine external characteristics scaling method and is had following advantage:
(1) biconjugate of the present invention puts two-stroke engine external characteristics scaling method, adopt data fitting and test the method combined, biconjugate to be measured can be obtained fast and put two-stroke engine external characteristic curve, reduce simple test method and carry out the process that external characteristics timing signal adjusts correlation parameter repeatedly, reduce engine research, development cost.
Accompanying drawing explanation
The accompanying drawing forming a part of the present invention is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 puts two-stroke engine external characteristics scaling method schematic flow sheet for the biconjugate described in the embodiment of the present invention.
Embodiment
It should be noted that, when not conflicting, the embodiment in the present invention and the feature in embodiment can combine mutually.
Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
Biconjugate of the present invention puts two-stroke engine external characteristics scaling method, comprises the following steps:
(1) make engine to be measured keep peak power to run, and then measure the correlation performance parameters that biconjugate to be measured puts two-stroke engine declared working condition point and maximum torque point and this declared working condition point and maximum torque point;
(2) known two-stroke engine external characteristics data and curve theory is used, and the correlation performance parameters of the declared working condition point measured in integrating step (1) and maximum torque point, derive the discrete point curve of correlation performance parameters with rotation speed change and the gross data of some discrete points that biconjugate to be measured puts two-stroke engine;
(3) based on the discrete points data obtained, carry out biconjugate to be measured and put two-stroke engine external characteristics Experimental Calibration, measure biconjugate to be measured put two-stroke engine in the step (2) discrete point real data in this state;
(4) gross data that real data test obtained and matching obtain compares, and difference is compared with degree of accuracy setting value;
If difference exceedes degree of accuracy setting value, and number of comparisons is not more than setting measurement number of times, namely the gross data that explanation matching obtains likely puts two-stroke engine actual external characteristics with biconjugate to be measured is not inconsistent, but this result is also unstable, need to determine further, then again measure after carrying out step (5) adjustment external working environment and compare;
If difference exceedes degree of accuracy setting value, and number of comparisons is greater than setting measurement number of times, namely illustrate that the actual external characteristics that the gross data that obtains of matching and biconjugate to be measured put two-stroke engine is not inconsistent, need to revise gross data, measurement comparative result before under this gross data is no longer applicable, therefore number of comparisons resets and carries out step (6), again measure after amendment gross data and compare;
If difference is within degree of accuracy range of set value, namely illustrate that the gross data that matching obtains meets the actual external characteristics that biconjugate to be measured puts two-stroke engine, carry out step (7), gross data matching obtained puts the external characteristic curve of two-stroke engine as biconjugate;
(5) adjust automatically controlled correlation parameter, repeat step (3) to step (4), the data that actual measurement data and matching are obtained are as far as possible close;
(6) adjust the parameter value derived by fitting theory, repeat step (3) to step (4), the data that matching is obtained and actual measurement data are as far as possible close;
(7) the discrete point curve drawn by fitting theory in this measurement exports as the external characteristic curve of engine to be measured.
Wherein, the correlation performance parameters in step (1) and step (2) comprises power, rotating speed and fuel consumption.
Automatically controlled correlation parameter in step (5) comprises injection advance angle, oil mass, rail pressure, pulsewidth, maximum permission pulsewidth.
The maximum difference scope that the gross data that the experiment that degree of accuracy setting value in step (4) is equipment obtains data and this equipment allows relatively time, this degree of accuracy setting value shows the levels of precision of equipment gross data.
Setting measurement number of times in step (4) is stability for guaranteeing measurement result and thinks the pendulous frequency of setting.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. biconjugate puts a two-stroke engine external characteristics scaling method, it is characterized in that: comprise the following steps:
(1) correlation performance parameters that biconjugate to be measured puts two-stroke engine declared working condition point and maximum torque point and this declared working condition point and maximum torque point is measured;
(2) use known two-stroke engine external characteristics data and curve theory, derive the discrete point curve of correlation performance parameters with rotation speed change that biconjugate to be measured puts two-stroke engine;
(3) based on the discrete points data obtained, carry out biconjugate to be measured and put two-stroke engine external characteristics Experimental Calibration;
(4) data that real data test obtained and matching obtain compare, and difference is compared with degree of accuracy setting value, if difference exceedes degree of accuracy setting value, and number of comparisons is not more than setting measurement number of times, then carry out step (5), if difference exceedes degree of accuracy setting value, and number of comparisons is greater than setting measurement number of times, then number of comparisons resets and carries out step (6), if difference is within degree of accuracy range of set value, then carries out step (7);
(5) adjust automatically controlled correlation parameter, repeat step (3) to step (4), the data that actual measurement data and matching are obtained are as far as possible close;
(6) adjust the parameter value derived by fitting theory, repeat step (3) to step (4), the data that matching is obtained and actual measurement data are as far as possible close;
(7) the discrete point curve drawn by fitting theory in this measurement exports as the external characteristic curve of engine to be measured.
2. biconjugate according to claim 1 puts two-stroke engine external characteristics scaling method, it is characterized in that: the correlation performance parameters in described step (1) and step (2) comprises power, rotating speed and fuel consumption.
3. biconjugate according to claim 1 puts two-stroke engine external characteristics scaling method, it is characterized in that: the automatically controlled correlation parameter in described step (5) comprises injection advance angle, oil mass, rail pressure, pulsewidth, maximum permission pulsewidth.
4. biconjugate according to claim 1 puts two-stroke engine external characteristics scaling method, it is characterized in that: the maximum difference scope that the gross data that the experiment that the degree of accuracy setting value in described step (4) is equipment obtains data and this equipment allows relatively time, this degree of accuracy setting value shows the levels of precision of equipment gross data.
5. biconjugate according to claim 1 puts two-stroke engine external characteristics scaling method, it is characterized in that: the setting measurement number of times in described step (4) is stability for guaranteeing measurement result and thinks the pendulous frequency of setting.
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| CN201510934728.6A CN105571873B (en) | 2015-12-14 | 2015-12-14 | A kind of double opposed two stroke engine external characteristics scaling methods |
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| CN201510934728.6A CN105571873B (en) | 2015-12-14 | 2015-12-14 | A kind of double opposed two stroke engine external characteristics scaling methods |
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| CN105571873B CN105571873B (en) | 2018-03-02 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105697179A (en) * | 2016-03-31 | 2016-06-22 | 山东大学 | System and method for calibrating external characteristic of electronic control diesel engine for loader |
| CN106679983A (en) * | 2017-02-14 | 2017-05-17 | 成都飞机工业（集团）有限责任公司 | Parameter calibration method for airplane turbofan engine |
| CN111721547A (en) * | 2020-06-28 | 2020-09-29 | 安徽江淮汽车集团股份有限公司 | Plateau hill start analysis input data acquisition method, device, equipment and storage medium |
| CN112393908A (en) * | 2020-04-28 | 2021-02-23 | 襄阳达安汽车检测中心有限公司 | Bench test method for pollutant emission of non-road diesel engine |
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| CN112393908A (en) * | 2020-04-28 | 2021-02-23 | 襄阳达安汽车检测中心有限公司 | Bench test method for pollutant emission of non-road diesel engine |
| CN111721547A (en) * | 2020-06-28 | 2020-09-29 | 安徽江淮汽车集团股份有限公司 | Plateau hill start analysis input data acquisition method, device, equipment and storage medium |
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