CN104502111A - Engine friction work analysis device and method - Google Patents
Engine friction work analysis device and method Download PDFInfo
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- CN104502111A CN104502111A CN201410679870.6A CN201410679870A CN104502111A CN 104502111 A CN104502111 A CN 104502111A CN 201410679870 A CN201410679870 A CN 201410679870A CN 104502111 A CN104502111 A CN 104502111A
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Abstract
The invention discloses an engine friction work analysis device and a method. The engine friction work analysis device comprises a test engine and a power dynamometer, and is technically characterized in that the crankshaft of the test engine is arranged on the transmission shaft of the power dynamometer; the bottom part of the test engine is provided with a process oil bottom shell; and an inlet and an outlet for constant temperature engine oil of the process oil bottom shell are respectively communicated with a constant temperature engine oil system. Problems that the prior test analysis method is low in accuracy and poor in safety can be fundamentally solved.
Description
Technical field
The present invention relates to a kind of motor car engine testing equipment and use the test method of this equipment, it is mainly applicable to the frictional dissipation analysis of each parts of engine.
Background technology
Along with China Automobile Industry and laws and regulations requirement, to oil consumption and emission request more and more stricter.The friction testing technology of internal combustion engine is also more and more important.The impact of each parts on complete machine frictional work of the engine judged is very complicated work.So be necessary for different parts (such as valve timing system, cylinder friction, crankshaft journal, annex) test analysis.
In engine performance exploitation, while being devoted to improve engine performance, also to pay close attention to the mechanical friction loss of engine itself.If have ignored friction mechanism loss impact on stream, the performance index of expection probably finally can not be obtained.
Measuring friction loss test method has a variety of, conventional has indicator diagram method, motoring breakdown, go out cylinder method, fuel consumption charateristic curve method etc.The unique distinction of this analysis method is, while the friction loss of engine evaluated complete machine, to measure the friction loss independently between friction pair and analyze.By setting up the friction loss database of enterprise oneself, the friction level of certain type in competing product type can be reacted very well.
As the Authorization Notice No. application for a patent for invention that is CN 104122019 A discloses a kind of measuring method of engine subsystems frictional work, comprise the following steps: A, the external machine oil external circulating device at oil filter place, the external liquid coolant external circulating device at water pump place.Frictional work T valve, oil pump frictional work T oil pump, other train frictional works T train, complete machine frictional work T complete machine, the pumping loss T pump gas of B, the frictional work T camshaft measuring crank shaft friction merit T bent axle, piston rod frictional work T piston rod, camshaft and timing chain, driving valve; C: the subsystem frictional work of contrast like product, the subsystem higher for frictional work is optimized.But it has following defect: the method adopts external Lubrication Control System, change the operating characteristic of the original lubricating system of engine, easily cause pasta perturbed problem, rotary part then can be caused to contact with pasta, and cause frictional resistance to increase, error is excessive; A large amount of machine oil particles mixes with air, causes air content in machine oil sharply to increase, and destroys lubricating oil film, easily causes security incident; The dynamic baffle plate that exceedes of lubricating oil ground roll also can cause the backflow of engine interior machine oil directly to come down in torrents to pasta, causes the sharp increase of machine oil air content, also can destroy lubricating oil film, cause security incident; Due under the Boundary Condition Effect such as different rotating speeds and temperature, accurately cannot reflect the friction level between each friction pair, also can cause the defect that accuracy of measurement is low.In addition, do not propose concrete testing program in this patent yet and how to analyze comparative test result.
Summary of the invention
The object of this invention is to provide a kind of engine friction horsepower analytical equipment and method, fundamentally solve the problems such as existing test analysis method accuracy is low, poor stability.
The technical solution adopted in the present invention is: this engine friction horsepower analytical equipment comprises test engine, electric dynamometer, its technical essential is: the crankshaft installed of described test engine is on the transmission shaft of electric dynamometer, mounting process oil sump bottom test engine, the constant temperature machine oil inlet of technical oil drain pan is connected with constant temperature machine oil system respectively with outlet.
The present invention separately provides a kind of engine friction horsepower analytical approach, and its technical essential comprises the following steps:
1) mounting process oil sump bottom test engine, is connected the constant temperature machine oil inlet of technical oil drain pan with constant temperature machine oil system respectively with outlet respectively, is connected mutually by test engine with electric dynamometer;
2) start constant temperature machine oil system and electric dynamometer, measure the interlock frictional work A of complete machine;
3) dismantle engine accessory power rating, measure complete machine frictional work and pumping loss sum B;
4) dismantle valve actuating mechanism, measure toggle frictional work D;
5) dismantle piston and connecting rod, assembling valve actuating mechanism, measures bent axle and valve actuating mechanism frictional work sum E;
6) dismantle valve actuating mechanism, measure crank shaft friction merit C;
7) calculate the interlock frictional work A of complete machine and complete machine frictional work, namely the difference of pumping loss sum B obtain the frictional work sum of engine accessory power rating; Namely the difference calculating toggle frictional work D and crank shaft friction merit C obtains the frictional work sum of piston and rod journal; Namely calculating bent axle and valve actuating mechanism frictional work sum E and crank shaft friction merit C obtain valve actuating mechanism frictional work F; Calculate complete machine frictional work and pumping loss sum B and toggle frictional work D, namely the difference of valve actuating mechanism frictional work F obtain pumping loss.
The advantage that the present invention has and positive technique effect are: in process of the test, and engine, without the need to igniting, is measured the friction loss of engine complete machine and each system unit by electric dynamometer towing astern engine.The High Temperature High Pressure produced when not considering to burn affects, determine the friction loss of the different parts of engine.For avoiding constant temperature system on the impact of machine oil pasta in process of the test, special technical oil drain pan.Adopt technical oil drain pan, not only remain the lubricating property of original engine, ensure that the oil inlet and oil return pipeline of lubricating system is away from lubrication pasta, and enough buffer areas are set for engine oil flow, what ensure pasta steadily controls oil temperature simultaneously, and make result closer to actual friction level, error is less.Clearly propose optimized testing program, and date comprision method.After calculating by the friction loss to actual measurement engine complete machine and each system unit, test findings is represented test findings with zonal arrangement figure, comprises towing astern torque value and the number percent of each system unit towing astern torque value in general machine loss of actual each system unit.So that can be analyzed with other types.Have very important significance in real engine positive development process.In sum, the present invention designs according to the physical attribute of engine itself and actual measurement completely, can complete test rapidly and accurately, save a large amount of time and cost of labor.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the invention will be further described.
Fig. 1 is structural representation of the present invention;
Fig. 2 is the zonal arrangement figure of table 2 test findings.
Description of reference numerals: 1 test engine, 2 technical oil drain pans, 3 transmission shafts, 4 electric dynamometers, 5 constant temperature machine oil inlets, 6 constant temperature machine oil exports.
Embodiment
embodiment 1
Particular content of the present invention is elaborated according to Fig. 1 ~ 2.This engine friction horsepower analytical equipment comprises the part such as test engine, electric dynamometer, wherein the crankshaft installed of test engine is on the transmission shaft of electric dynamometer, and bottom test engine mounting process oil sump, the constant temperature machine oil inlet of technical oil drain pan is connected with constant temperature machine oil system respectively with outlet.
This engine friction horsepower analytical approach comprises the following steps:
1) mounting process oil sump bottom test engine, is connected the constant temperature machine oil inlet of technical oil drain pan with constant temperature machine oil system respectively with outlet respectively, is connected mutually by test engine with electric dynamometer;
2) start constant temperature machine oil system and electric dynamometer, measure the interlock frictional work A of complete machine;
3) dismantle engine accessory power rating, measure complete machine frictional work and pumping loss sum B;
4) dismantle valve actuating mechanism, measure toggle frictional work D;
5) dismantle piston and connecting rod, assembling valve actuating mechanism, measures bent axle and valve actuating mechanism frictional work sum E;
6) dismantle valve actuating mechanism, measure crank shaft friction merit C;
7) calculate the interlock frictional work A of complete machine and complete machine frictional work, namely the difference of pumping loss sum B obtain the frictional work sum of engine accessory power rating; Namely the difference calculating toggle frictional work D and crank shaft friction merit C obtains the frictional work sum of piston and rod journal; Namely calculating bent axle and valve actuating mechanism frictional work sum E and crank shaft friction merit C obtain valve actuating mechanism frictional work F; Calculate complete machine frictional work and pumping loss sum B and toggle frictional work D, namely the difference of valve actuating mechanism frictional work F obtain pumping loss.
Measured the test method of frictional work by dismounting engine corresponding assembly limit, limit, test under boundary condition.Reprocessing analysis is carried out to test result, thus determines the friction loss of each assembly of engine.
By comparing of the friction loss tolerance range of single engine and competing product engine, the optimized distribution of friction can be drawn.Engine all parts friction losses dispersion zone occupies more among a small circle, if measurement result is beyond competition type dispersion zone, then will provide the suggestion improving the friction of these parts.
Test procedure is as shown in table 1, and experimental result is as shown in table 2.
The test procedure of table 1 embodiment 1
The test findings of table 2 embodiment 1.
As step 4 and step 6 exchanged, then after measuring the frictional work of bent axle, also to ressemble connecting rod and piston just can complete toggle friction test, adding time and cost of labor, be unfavorable for improving test efficiency.In step 3) ~ 6) in, the boundary condition of liquid coolant and lubricating oil system, in step 2) be standard value.About the engine speed in process of the test, be and be increased to rated power rotating speed from low idling with each 500rpm.
In addition, when the engine oil viscosity numerical value in the present invention, the selection of liquid coolant and oil temperature are those skilled in the art according to measurement concrete engine parameter, the routine of carrying out for reaching best test findings is selected, and is not elaborated herein for saving length.
Claims (2)
1. an engine friction horsepower analytical equipment, comprise test engine, electric dynamometer, it is characterized in that: the crankshaft installed of described test engine is on the transmission shaft of electric dynamometer, mounting process oil sump bottom test engine, the constant temperature machine oil inlet of technical oil drain pan is connected with constant temperature machine oil system respectively with outlet.
2. engine friction horsepower analytical approach, is characterized in that, comprises the following steps:
1) mounting process oil sump bottom test engine, is connected the constant temperature machine oil inlet of technical oil drain pan with constant temperature machine oil system respectively with outlet respectively, is connected mutually by test engine with electric dynamometer;
2) start constant temperature machine oil system and electric dynamometer, measure the interlock frictional work A of complete machine;
3) dismantle engine accessory power rating, measure complete machine frictional work and pumping loss sum B;
4) dismantle valve actuating mechanism, measure toggle frictional work D;
5) dismantle piston and connecting rod, assembling valve actuating mechanism, measures bent axle and valve actuating mechanism frictional work sum E;
6) dismantle valve actuating mechanism, measure crank shaft friction merit C;
7) calculate the interlock frictional work A of complete machine and complete machine frictional work, namely the difference of pumping loss sum B obtain the frictional work sum of engine accessory power rating; Namely the difference calculating toggle frictional work D and crank shaft friction merit C obtains the frictional work sum of piston and rod journal; Namely calculating bent axle and valve actuating mechanism frictional work sum E and crank shaft friction merit C obtain valve actuating mechanism frictional work F; Calculate complete machine frictional work and pumping loss sum B and toggle frictional work D, namely the difference of valve actuating mechanism frictional work F obtain pumping loss.
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| CN201410679870.6A CN104502111A (en) | 2014-11-24 | 2014-11-24 | Engine friction work analysis device and method |
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| CN201410679870.6A CN104502111A (en) | 2014-11-24 | 2014-11-24 | Engine friction work analysis device and method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106679980A (en) * | 2015-11-11 | 2017-05-17 | 北京汽车动力总成有限公司 | Cylinder hole plugging device used for frictional work testing |
| CN108548674A (en) * | 2018-05-23 | 2018-09-18 | 中国汽车技术研究中心有限公司 | A kind of engine friction pumping loss decomposition is test bed |
| CN109540533A (en) * | 2018-05-23 | 2019-03-29 | 中国汽车技术研究中心有限公司 | A kind of engine friction pumping loss decomposition method |
| CN110763480A (en) * | 2019-11-28 | 2020-02-07 | 广西玉柴机器股份有限公司 | Method and device for measuring friction and accessory loss of diesel engine |
| CN115700360A (en) * | 2022-11-03 | 2023-02-07 | 赛力斯集团股份有限公司 | Engine friction work testing method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106679980A (en) * | 2015-11-11 | 2017-05-17 | 北京汽车动力总成有限公司 | Cylinder hole plugging device used for frictional work testing |
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| CN109540533A (en) * | 2018-05-23 | 2019-03-29 | 中国汽车技术研究中心有限公司 | A kind of engine friction pumping loss decomposition method |
| CN110763480A (en) * | 2019-11-28 | 2020-02-07 | 广西玉柴机器股份有限公司 | Method and device for measuring friction and accessory loss of diesel engine |
| CN115700360A (en) * | 2022-11-03 | 2023-02-07 | 赛力斯集团股份有限公司 | Engine friction work testing method |
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Application publication date: 20150408 |