CN1657896A - Automatic testing method for universal performance of vehicle engine oil pump - Google Patents
Automatic testing method for universal performance of vehicle engine oil pump Download PDFInfo
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- CN1657896A CN1657896A CN 200510024578 CN200510024578A CN1657896A CN 1657896 A CN1657896 A CN 1657896A CN 200510024578 CN200510024578 CN 200510024578 CN 200510024578 A CN200510024578 A CN 200510024578A CN 1657896 A CN1657896 A CN 1657896A
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Abstract
The invention belongs to the test area of technology the automobile oil pump general characteristic test automation method, the following steps are: 1) distinguishing the test condition inoutted by user, regarding permits in it with the operating region in distributes the even test condition, uses the orthogonal experiment design method automatic determination experiment number of times least tests operating mode 2) in the test process, completes of by the automatic control system the speed change, variable load and the oil temperature condition and the survey the control; 3) after gains the completely tentative data, the viscosity-temp characteristics and density-temp. characteristics of the test oil to carry on many Yuan non-linear return processing Generating universal characteristic function expression and drawing universal characteristic curve for tested oil pump.
Description
Technical field
What the present invention relates to is a kind of automatic test approach of lubricating pump of automobile, specifically, is a kind of automatic test approach of universal performance of vehicle engine oil pump.Belong to technical field of measurement and test.
Background technology
Lubricating pump of automobile is the critical component of motor car engine, and its effect is to each friction of motion pair supplying lubricating oil continuously, and the quality of lubricating oil pump performance directly influences the performance of engine.Car lubricating oil pump particularly, rotating speed height, temperature height, its workmanship and serviceability require all very high.In order to study, design, develop high performance machine oil pump, the workmanship of controller oil pump better better, the combination property intelligence test of carrying out lubricating pump of automobile is very important.Because universal performance can be represented the full performance of lubricating oil pump in whole working speed allowable, pressure and temperature scope, so the test result of universal performance has extremely important meaning for the product quality of weighing lubricating oil pump in the practice.
The test of universal performance of vehicle engine oil pump for a long time relies on manually fully and realizes, promptly under the condition of speed change, variable load and change oil temperature, flow, the rotating speed of lubricating oil pump under each operating mode of hand-kept, pumps pressure and exports parameter such as oily temperature.Not only efficient is low, and can be because measurement parameter is many, and each parameter can not read simultaneously and introduce reading error.In addition, when testing under High Temperature High Pressure, owing to manually do not have computing machine to be quick on the draw, hidden danger easily causes the accident.By prior art documents, do not find identical with theme of the present invention or similar report as yet.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, a kind of automatic test approach of universal performance of vehicle engine oil pump is proposed, make it under speed change, variable load and the warm operating mode of change oil, automatically finish the test of universal performance of vehicle engine oil pump, and testing efficiency, measuring accuracy and security all there is raising significantly than existing method of testing.
The present invention is achieved by the following technical solutions:
1, the test condition of user's input is differentiated,, adopted the test operating mode of the automatic confirmed test least number of times of orthogonal experiment design method for the test condition that in its working range allowable, is evenly distributed.
2, in test process, finish control and measurement under speed change, variable load and the warm condition of change oil by automatic control system, and when fault takes place, can the support personnel and the safety of equipment, simultaneously failure cause is made diagnosis.
3, obtain the Total Test data after, utilize the viscosity-temperature characteristics and the close temperature characteristics of test oil to carry out the nonlinear multivariable regression treatment: when multiple correlation coefficient and recurrence average relative error all meet the demands, lubricating oil pump universal performance test passes so, and generate the universal performance function expression, under the temperature conditions of setting, draw out the complete performance of lubricating oil pump; When multiple correlation coefficient with return that any one does not meet the demands in the average relative error, lubricating oil pump universal performance test failure so, system extracts the test operating mode of its outlier automatically, and whether suggestion user proof machine oil pump under this operating mode lost efficacy.
Described test condition, be meant lubricating oil pump rotating speed, pump pressure and these three factors of outlet oil temperature.Each factor has the different conditions (being called level or position level) more than five kinds again.
Described speed change, variable load and the warm condition of change oil are meant according to the determined test operating mode of orthogonal experiment design method, wherein the rotating speed of lubricating oil pump, pump pressure and export oily temperature and change.
Described viscosity-temperature characteristics are meant that universal performance tests the characteristic that the viscosity with temperature of used test oil changes.
Described close temperature characteristics is meant that universal performance tests the temperature variant characteristic of density of used test oil.
Described universal performance function expression, being meant rotating speed with lubricating oil pump, pumping pressure and export oily temperature is independent variable, is the nonlinear multivariable function of dependent variable with the flow.
Described complete performance, be meant the universal performance function expression according to gained, at first setting machine oil delivery side of pump oil temperature is the test oil temperature, is horizontal ordinate to pump pressure then, with the flow is ordinate, isometric(al) efficiency curve and the rotation speed characteristic drawn out.
Described outlier is meant to cause that any one does not satisfy the test data of testing requirements in multiple correlation coefficient and the recurrence average relative error.
Principle of work of the present invention is as follows:
1, the test operating mode determines
The test condition of user's input may not all be reasonably, must differentiate its rationality automatically according to the numerical values recited and the distribution situation in working range allowable thereof of each test condition.Test condition comprise lubricating oil pump rotating speed, pump pressure and these three factors of outlet oil temperature, each factor will be got states different more than five kinds.Even if get 5 kinds of minimum states, the test number (TN) of so this three factors, five levels also will reach 125 times, if carry out one by one, not only consume material resources, financial resources and time, and might not reach expected result.Adopted the Optimization Design of multifactorial experiment---orthogonal test method, this method can be determined minimum test number (TN) under the prerequisite that guarantees the test effect, thereby improves testing efficiency for this reason.
2, the automatic safe test under speed change, variable load and the warm condition of change oil
Universal performance requires to finish test under the condition of speed change, variable load and change oil temperature.Because test condition is relatively harsher, may cause various faults in test process, and these faults both may have been caused by lubricating oil pump inefficacy itself, might be caused by test macro itself again.In order when fault takes place, to guarantee the safety of operating personnel and equipment, the emergency of the necessary warranty test equipment of automatic control system, remind operating personnel to note with the form of sound and light alarm simultaneously, and help operating personnel's analyzing failure cause by fault diagnosis functions.
3, the analyzing and processing of test data
Viscosity-temperature characteristics and close temperature characteristics are reflection test oil viscosity and the temperature variant characteristic of density, and they are condition precedents that complete performance is drawn, thereby must measure in advance before the universal performance test.The quality of lubricating oil pump universal performance is the evaluation index that returns by nonlinear multivariable---multiple correlation coefficient and recurrence average relative error are weighed.If multiple correlation coefficient and recurrence average relative error all satisfy testing requirements, think lubricating oil pump universal performance test passes so, and generation universal performance function expression, under the test oil temperature of setting, to pump pressure is horizontal ordinate, flow is an ordinate, draws isometric(al) efficiency curve and rotation speed characteristic.Otherwise think lubricating oil pump universal performance test failure, at this moment system extracts its test operating mode with the outlier in the automatic analytical test data, and suggestion user repeated test under this operating mode.Doing like this is because the evaluation index that nonlinear multivariable returns has very high requirement to the accuracy of test data, even if sometimes sampled data has been carried out filtering, also may not one rejects outlier surely.If under the test operating mode of outlier, carry out repeated test, can confirm further whether lubricating oil pump exists mass defect.
The invention has the beneficial effects as follows: optimization of orthogonal test method for designing, automatic control technology are combined with the regretional analysis technology, successfully realized the automatic test of universal performance of vehicle engine oil pump.Compare with the manual testing, efficient has improved 40%, and precision has improved 2%, and security has also improved greatly.
Embodiment
Embodiment:
Present embodiment is carrying out on the JD-001 of independent research type lubricating oil pump performance test stand, and detected lubricating oil pump is the CA488 type lubricating oil pump that this automobile fitting factory produces.The secondary control structure that the control system of testing table has adopted computing machine to combine with Programmable Logic Controller (PLC).Concrete implementation step is as follows:
1, computing machine automatically to the rotating speed of the lubricating oil pump of user input, pump pressure and differentiate with five kinds of different testing levels of these three factors of outlet oil temperature, adopt orthogonal experiment design method to determine 35 groups of test operating modes that test number (TN) is minimum then.
2, in test process, PLC finished lubricating oil pump rotating speed, pump the automatic adjusting of pressure and outlet oil temperature, wherein survey the fluctuation of speed ± 5r/min, temperature-controlled precision reaches ± 1 ℃.
3, utilize nonlinear multivariable to return test figure is handled, the multiple correlation coefficient that obtains is 0.9991, and returning average relative error is 0.032, satisfies multiple correlation coefficient greater than 0.997, and returning average relative error should be in the testing requirements below 0.05.
Under same test condition, adopt the inventive method test period can be foreshortened to 3 hours by 5 hours of manual testing, efficient has improved 40%; The multiple correlation coefficient of regression Calculation rises to 0.9991 by manual testing's 0.9972, and precision has improved 2%.This shows based on the efficient of the lubricating oil pump universal performance method of testing of computer autocontrol technique and precision all has raising significantly than manual testing method, has satisfied the test request of universal performance of vehicle engine oil pump.
Claims (7)
1, a kind of automatic test approach of universal performance of vehicle engine oil pump is characterized in that, concrete steps are as follows:
1) test condition of user's input is differentiated,, adopted the test operating mode of the automatic confirmed test least number of times of orthogonal experiment design method for the test condition that in its working range allowable, is evenly distributed;
2) in test process, finish control and measurement under speed change, variable load and the warm condition of change oil by automatic control system, and when fault takes place, can the support personnel and the safety of equipment, simultaneously failure cause is made diagnosis;
3) obtain the Total Test data after, utilize the viscosity-temperature characteristics and the close temperature characteristics of test oil to carry out the nonlinear multivariable regression treatment: when multiple correlation coefficient and recurrence average relative error all meet the demands, lubricating oil pump universal performance test passes so, and generation universal performance function expression, under the temperature conditions of setting, draw out the complete performance of lubricating oil pump, any one does not meet the demands in multiple correlation coefficient and recurrence average relative error, lubricating oil pump universal performance test failure so, system extracts the test operating mode of its outlier automatically, and whether suggestion user proof machine oil pump under this operating mode lost efficacy.
2, the automatic test approach of universal performance of vehicle engine oil pump according to claim 1 is characterized in that, described test condition, be meant lubricating oil pump rotating speed, pump pressure and these three factors of outlet oil temperature.
3, the automatic test approach of universal performance of vehicle engine oil pump according to claim 1, it is characterized in that, described speed change, variable load and the warm condition of change oil, be meant according to the determined test operating mode of orthogonal experiment design method, wherein the rotating speed of lubricating oil pump, pump pressure and export oily temperature and change.
4, the automatic test approach of universal performance of vehicle engine oil pump according to claim 1 is characterized in that, described viscosity-temperature characteristics are meant that universal performance tests the characteristic that the viscosity with temperature of used test oil changes.
5, the automatic test approach of universal performance of vehicle engine oil pump according to claim 1 is characterized in that, described close temperature characteristics is meant that universal performance tests the temperature variant characteristic of density of used test oil.
6, the automatic test approach of universal performance of vehicle engine oil pump according to claim 1, it is characterized in that, described universal performance function expression, being meant rotating speed with lubricating oil pump, pumping pressure and export oily temperature is independent variable, is the nonlinear multivariable function of dependent variable with the flow.
7, the automatic test approach of universal performance of vehicle engine oil pump according to claim 1, it is characterized in that, described complete performance, be meant universal performance function expression according to gained, at first setting machine oil delivery side of pump oil temperature is the test oil temperature, being horizontal ordinate to pump pressure then, is ordinate with the flow, isometric(al) efficiency curve and the rotation speed characteristic drawn out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100245781A CN100399009C (en) | 2005-03-24 | 2005-03-24 | Automatic testing method for universal performance of vehicle engine oil pump |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100245781A CN100399009C (en) | 2005-03-24 | 2005-03-24 | Automatic testing method for universal performance of vehicle engine oil pump |
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| CN1657896A true CN1657896A (en) | 2005-08-24 |
| CN100399009C CN100399009C (en) | 2008-07-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2005100245781A Expired - Fee Related CN100399009C (en) | 2005-03-24 | 2005-03-24 | Automatic testing method for universal performance of vehicle engine oil pump |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102966631A (en) * | 2012-11-16 | 2013-03-13 | 无锡阳工机械制造有限公司 | Rated flow and pressure determining method of elevator hydraulic pump |
| CN104442800B (en) * | 2013-09-12 | 2017-09-15 | 上海汽车集团股份有限公司 | Oil pump diagnostic method in gearbox and the hybrid vehicle using this method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4302610C2 (en) * | 1993-01-30 | 1996-08-08 | Daimler Benz Ag | Process for regulating the pump output of lubricant pumps and lubricant pump therefor |
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2005
- 2005-03-24 CN CNB2005100245781A patent/CN100399009C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102966631A (en) * | 2012-11-16 | 2013-03-13 | 无锡阳工机械制造有限公司 | Rated flow and pressure determining method of elevator hydraulic pump |
| CN104442800B (en) * | 2013-09-12 | 2017-09-15 | 上海汽车集团股份有限公司 | Oil pump diagnostic method in gearbox and the hybrid vehicle using this method |
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| Publication number | Publication date |
|---|---|
| CN100399009C (en) | 2008-07-02 |
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Granted publication date: 20080702 Termination date: 20120324 |