CN100346071C - Automatic testing method for pressure fluctuation of lubricating pump of automobile - Google Patents
Automatic testing method for pressure fluctuation of lubricating pump of automobile Download PDFInfo
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- CN100346071C CN100346071C CNB2005100245777A CN200510024577A CN100346071C CN 100346071 C CN100346071 C CN 100346071C CN B2005100245777 A CNB2005100245777 A CN B2005100245777A CN 200510024577 A CN200510024577 A CN 200510024577A CN 100346071 C CN100346071 C CN 100346071C
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- lubricating pump
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Abstract
The present invention relates to an automatic testing method for the pressure fluctuation of a lubricating pump of an automobile, which belongs to the field of testing technique. The present invention comprises the following specific steps: 1, a combination performance testing desk for the lubricating pump is operated to meet the testing requirements of pressure fluctuation characteristics; 2, after a computer receives a signal of starting collection, a data collection plate /card starts collecting data, and automatically collects numbers instantaneously read by a pressure sensor until the collection time is over; 3, the computer stores the data in a memory to a database file, analyzes the fluctuation frequency of the pressure fluctuation of the lubricating pump, the maximum value and the minimum value of the pumped pressure according to the collected data, and draws a test graph of the pressure fluctuation characteristics. In the present invention, the rotary speed of the lubricating pump of a pressure fluctuation testing machine is increased by higher than 10000 r/min from lower than 1000 r/min so as to realize the automatic test of the pressure fluctuation of the lubricating pump of an automobile at high rotary speed and greatly improve test precision.
Description
Technical field
What the present invention relates to is a kind of test method of pressure, specifically, is a kind of automatic test approach of pressure fluctuation of lubricating pump of automobile.Belong to technical field of measurement and test.
Background technique
Lubricating pump of automobile is the critical component of motor, and its effect is to make the engine oil pressure rising and keep certain oil pressure, forces fuel feeding to each kinetic friction surface, and it is lubricated reliably that motor is obtained, and the quality of its performance directly influences the operation of motor.Lubricating pump of automobile comprises outer gearing involute gear pump commonly used and interior engagement cycloid gear pump and other positive displacement oil pump.Particularly for the outer gearing involute gear pump, because its structural reason, pressure surge is obvious, can cause that big noise and service behaviour descend.Pressure surge is the important indicator of oil pump service behaviour, but because the Pressure Fluctuation Signal frequency is higher, particularly for high tachogenerator oil pump, measure very inconvenience, lack effective method of measurement for the pressure surge project in the oil pump all-round property testing all the time, in addition that the pressure surge test event is not included in JB/T8886 " engine oil pump of internal combustion engine test method ".And abroad, all the pressure surge test event has been made clear and definite and strict regulation in the oil pump test method of many countries.Develop rapidly and extensive use along with The present computer technology, various data acquistion systems are widely applied to every field such as production, monitoring, check, as industry spot data capture, radar echo signal data capture, and the wave height of ocean and tidal signal collection etc.Data collecting plate card is the key device of determination data picking rate in the hardware system, and it will be converted into Computer signal through the transducing signal of front-end processing, and be received by computer, can be used for the quick collection of signal.
Find by prior art documents, " computer aided testing high-pressure service pump Laboratory Furniture system and characteristic Research of digital simulation thereof " (the Chinese academic dissertation full-text database of writing at Ling Xuan, in May, 2003) in the literary composition, its test mode is that the tiny signal output of sensor is amplified through amplifier, enter the A/D conversion then, through RS-485/RS232 serial port input computer.Its deficiency is: because the existence of serial communication speed " bottleneck ", the sampling period is limited in can't satisfying the demand that high tachogenerator pressure fuel pump wave characteristic is measured between a few tens of milliseconds to 1 second.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, propose a kind of automatic test approach of pressure fluctuation of lubricating pump of automobile, achieve the measurement of high rotating speed automobile engine oil pumping pressure instantaneous variation, and improve the testing precision of system greatly.
The present invention is achieved through the following technical solutions, and concrete steps of the present invention are as follows:
1, operation oil pump combination property test desk reaches the requirement of pressure surge characteristic test.
2, after machine to be calculated received and begins to gather signal, the data collecting plate card image data began, and the instantaneous reading of automatic pressure acquisition sensor finishes until acquisition time.
3, computer deposits the data in the internal memory in database file, according to the vibration frequency of the data analysis pressure fluctuation of lubricating pump that collects, the maximum value that pumps pressure and minimum value, draws pressure surge characteristic test plotted curve.
The requirement of described pressure surge characteristic test is meant that oil pump combination property test desk fuel tank temperature is a normal temperature, and it is rated working pressure that oil pump pumps pressure, and the oil pump rotating speed reaches rated engine speed.
The process of described data collecting plate card image data is: at first the integrated circuit board driver is loaded into internal memory, integrated circuit board is carried out initialization, make integrated circuit board perform the preparatory work of I/O.Then, computer system is provided with input port quantity, input gain value, sample frequency, acquisition time, sampling configuration parameter according to the demand of image data.Just can begin the input of analog amount after parameter sets, after the A/D conversion, integrated circuit board adopts two caching technology storage data.The input of last end simulation amount, closing device.
Described pair of caching technology, be meant that the FIFO buffer storage is divided into two half identical districts, the data that collect at first are stored in wherein one and half districts, and the function circular test that moves in another thread the state of FIFO buffer storage, after treating that this half district is filled, computer system produces the feasible data that newly collect of a hardware interrupts then is stored in other one and half districts and goes, the data that will be filled simultaneously in half district are transferred in the continuous transfer buffer area of opening up in internal memory, reexamine acquisition time and whether reached setting value, finish until acquisition time and so forth.
Described pressure surge characteristic test plotted curve is meant that be abscissa with oil pump from gathering the angular displacement that turns over the zero hour, is y coordinate to pump force value, the plotted curve of being drawn.
Working principle of the present invention is as follows:
1, determining of pressure surge data acquiring frequency
The structure and the technology of the outer gearing involute gear pump in the lubricating pump of automobile, in all kinds of oil hydraulic pumps, be the simplest, thereby all preponderate on price, reliability, life-span, antipollution and suction capacity, but flow pulsation and the fluctuation of entrap phenomenon initiation pressure cause the problem ubiquity of vibration and noise.The instantaneous flow pulsation of outer gearing involute gear pump is because Principles of Gear Connection itself cause, and when a pair of external gear pump meshed, gear pump instantaneous flow q was:
(1)
N---gear pump rotating speed;
B---gear tooth width;
R
c---the gear teeth tips circle radius;
R---pitch circle radius;
R
f---the rolling circle radius;
---gear corner.
The entrap phenomenon of outer gearing involute gear pump is because the size variation of bottom clearance and sideshake seal space during gear transmission, cause the pressure generation rapid change of trapped fluid caused, so the volume of pocketed oil just in time equals the difference V of the volume of the effective tooth depth part of teeth groove volume and the gear teeth, then the changes in flow rate q ' that causes of pocketed oil is:
q′＝2nVz
(2)
Z---the gear number of teeth.
Because changes in flow rate will cause the simultaneous pressure variation, thus can infer that from formula (1) and formula (2) the variation in pressure frequency of oil pump is directly proportional with the oil pump test speed, so pressure surge data acquiring frequency: 〉=5n/3.And the rated engine speed of oil pump can in order accurately to express the instantaneous variation of the working pressure of oil pump under the high rotating speed, must adopt data collecting plate card to come the harvester pressure fuel pump to change near 5000r/min now.
2, two caching technologys improve acquisition speed
The employing of two caching technologys has significantly reduced the number of times of hardware interrupts, has guaranteed the continuity of data capture, makes data capture be able to carrying out at a high speed.
The invention has the beneficial effects as follows: the rotating speed of pressure surge test machine oil pump from bringing up to below the 1000r/min more than the 10000r/min, has been realized the automatic test of high rotating speed pressure fluctuation of lubricating pump of automobile, and improved the precision of test greatly.
Description of drawings
Fig. 1 is a pressure surge characteristic test plotted curve
Embodiment
Embodiment
Present embodiment carries out on the JD-001 of independent research type " oil pump combination property intelligence test platform ", and tested oil pump is " CA488 " type lubricating pump of automobile that the rich component corporate system pump branch company difficult to understand of the First Automobile Group is produced.
The configuration of table 1 pressure fluctuation of lubricating pump of automobile ATS Automatic Test System
| Pressure transducer | High-speed data acquisition card | Conjunction cable | Wiring module |
| Sweden STS AG, precision ± 0.1%FS | Grind magnificent PCI-1711, maximum sample frequency is 100KHz | PCL-10168 | PCLD-8710 |
1, the oil pump combination property test desk is adjusted oil pump and is pumped pressure and reach 0.3 ± 0.005MPa (rated working pressure of " CA488 " type lubricating pump of automobile is 0.3MPa, systematic error is ± 0.005MPa), rotating speed reaches 2500 ± 5r/min, and (rated engine speed of " CA488 " type lubricating pump of automobile is 2500r/min, systematic error is ± 5r/min), reach the requirement of pressure surge characteristic test.
2, send pressure surge data capture instruction by industrial control configuration software after, computer system is set at 10kHz with the frequency acquisition of data collecting plate card automatically, (pressure transducer output current signal 4～20mA is converted to voltage signal 1～5V) to measuring range setting ± 5V, and acquisition time was 8 seconds.The pressure transducer output signal according to two caching technology principles, deposits the stored memory that computer is opened up in the form of digital signal automatically after A/D conversion.
3, the data of Cai Jiing are stored the database file into Access, after pressure fluctuation of lubricating pump frequency and the maximin that pumps pressure are analyzed, show resulting result and draw the pressure surge plotted curve.Fig. 1 has shown the pressure surge characteristic test plotted curve and the analysis result of " CA488 " type lubricating pump of automobile.
This method has realized that rated engine speed is that the pressure fluctuation of lubricating pump of automobile data of 2500r/min are gathered fast, and the sampling period has reached 0.01ms, has improved 100 times than serial communication method, through relatively having reached the test effect of the similar test in German laboratory.
Claims (3)
1, a kind of automatic test approach of pressure fluctuation of lubricating pump of automobile is characterized in that:
1) produces principle by analyzing pressure fluctuation of lubricating pump of automobile, draw the span of theoretical pressure signal sampling frequency;
2) adopt two caching technologys to realize the high-speed data acquisition of the big data quantity of pressure signal;
3) test basic step: load driver program, initialization integrated circuit board; The sample frequency that obtains according to theory analysis requires sampling parameter is provided with; After the analog-to-digital conversion, adopt two caching technology storage data; Computer deposits the data in the internal memory in database file, according to the vibration frequency of the data analysis pressure fluctuation of lubricating pump that collects, the maximum value that pumps pressure and minimum value, draws pressure surge characteristic test plotted curve.
2, the automatic test approach of pressure fluctuation of lubricating pump of automobile according to claim 1, it is characterized in that, described pair of caching technology, be meant that the FIFO buffer storage is divided into two half identical districts, the data that collect at first are stored in wherein one and half districts, and the function circular test that moves in another thread the state of FIFO buffer storage, after treating that this half district is filled, computer system produces the feasible data that newly collect of a hardware interrupts then is stored in other one and half districts and goes, simultaneously, in calculator memory, open up continuous transfer buffer area, the data that are filled in half district are transferred in this buffer area, reexamine acquisition time and whether reached setting value, finish until acquisition time and so forth.
3, the automatic test approach of pressure fluctuation of lubricating pump of automobile according to claim 1, it is characterized in that described pressure surge characteristic test plotted curve is meant that be abscissa with oil pump from gathering the angular displacement that turns over the zero hour, to pump force value is y coordinate, the plotted curve of being drawn.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100245777A CN100346071C (en) | 2005-03-24 | 2005-03-24 | Automatic testing method for pressure fluctuation of lubricating pump of automobile |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100245777A CN100346071C (en) | 2005-03-24 | 2005-03-24 | Automatic testing method for pressure fluctuation of lubricating pump of automobile |
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| Publication Number | Publication Date |
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| CN1664369A CN1664369A (en) | 2005-09-07 |
| CN100346071C true CN100346071C (en) | 2007-10-31 |
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| CNB2005100245777A Expired - Fee Related CN100346071C (en) | 2005-03-24 | 2005-03-24 | Automatic testing method for pressure fluctuation of lubricating pump of automobile |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103016939A (en) * | 2011-09-28 | 2013-04-03 | 上海乾通汽车附件有限公司 | Involute gear for oil pump assemblies of gasoline engines |
| CN113551906B (en) * | 2021-07-30 | 2023-11-28 | 博格华纳汽车零部件(北京)有限公司 | Device and method for testing pressure fluctuation of hydraulic drive system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DD222409A1 (en) * | 1984-03-06 | 1985-05-15 | Freiberg Brennstoffinst | MEASURING ARRANGEMENT AND MEASURING METHOD FOR DETECTING PRESSURE FLUCTUATIONS |
| SU1691551A1 (en) * | 1989-12-05 | 1991-11-15 | Пермский политехнический институт | Method and device for determination of pressure fluctuations at pump suction end |
| DE19625947C1 (en) * | 1996-06-28 | 1997-09-18 | Uraca Pumpen | Pump-operating fault detection method |
| CN2677665Y (en) * | 2004-01-14 | 2005-02-09 | 山东弘德机械工业有限公司 | Oil pump for vehicle engine |
-
2005
- 2005-03-24 CN CNB2005100245777A patent/CN100346071C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DD222409A1 (en) * | 1984-03-06 | 1985-05-15 | Freiberg Brennstoffinst | MEASURING ARRANGEMENT AND MEASURING METHOD FOR DETECTING PRESSURE FLUCTUATIONS |
| SU1691551A1 (en) * | 1989-12-05 | 1991-11-15 | Пермский политехнический институт | Method and device for determination of pressure fluctuations at pump suction end |
| DE19625947C1 (en) * | 1996-06-28 | 1997-09-18 | Uraca Pumpen | Pump-operating fault detection method |
| CN2677665Y (en) * | 2004-01-14 | 2005-02-09 | 山东弘德机械工业有限公司 | Oil pump for vehicle engine |
Non-Patent Citations (2)
| Title |
|---|
| 汽车机油泵实验系统的研制 程军，赵葆君，崔嵘，汽车技术，第1994卷第7期 1994 * |
| 计算机辅助测试高压泵实验台及其特性数字仿真研究 凌轩，广西大学硕士学位论文 2003 * |
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