CN105203328A - Experimental method and device for working state of engine cooling nozzle by simulating real vehicle - Google Patents
Experimental method and device for working state of engine cooling nozzle by simulating real vehicle Download PDFInfo
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- CN105203328A CN105203328A CN201510676806.7A CN201510676806A CN105203328A CN 105203328 A CN105203328 A CN 105203328A CN 201510676806 A CN201510676806 A CN 201510676806A CN 105203328 A CN105203328 A CN 105203328A
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- cylinder body
- real vehicle
- engine cooling
- bent axle
- electric dynamometer
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Abstract
The invention discloses an experimental method and device for the working state of an engine cooling nozzle by simulating a real vehicle. The experimental method comprises the following steps: step I: dismantling the components above a cylinder body, removing a piston in the cylinder body, then, adding engine oil into the cylinder body, connecting the output shaft of an electric dynamometer with a crank shaft of the cylinder body, arranging rulers inside cylinder barrels, and arranging a camcorder above the cylinder body; step II: starting the electric dynamometer to drag the cylinder body to run at different rotating speed, measuring and recording the jetting height, angle and target spot of the cooling nozzle at different rotating speed through the rulers and the camcorder. The device comprises the cylinder body and the electric dynamometer, wherein the output shaft of the electric dynamometer is connected with the crank shaft of the cylinder body; the rulers are hung on the inner wall of the cylinder body; the camcorder is arranged above the cylinder body. According to the invention, the electric dynamometer is used for dragging the cylinder body to operate at different rotating speed to simulate the running of the real vehicle at different rotating speed; besides, the jetting height, jetting angle and target spot of the cooling nozzle are measured and recorded through the rulers and the camcorder, so that experimental data is provided for design and development of the engine cooling nozzle.
Description
Technical field:
The invention belongs to the field tests of engine, be specifically related to test method and the device of a kind of engine cooling spray nozzle simulation real vehicle duty.
Background technology:
Engine operationally, because the thermal load of its piston is comparatively large, needs to install cooling jet additional in the cylinder body of engine and cools piston.The actual working state of cooling jet is related to the degree of piston affected by hot loading.When the spray angle of cooling jet is inaccurate, or jetting height inadequate time, excessive or the inequality of being heated of piston heat load can be caused, when piston runs for a long time under these rugged surroundings, can affect to engine, the accident of scuffing of cylinder bore or detonation can be produced, so the duty of observing cooling jet is very necessary time serious.But under engine work state be the duty cannot observing cooling jet, this brings great resistance just to the designing and developing of engine cooling spray nozzle.
Summary of the invention:
The present invention is for overcoming the deficiencies in the prior art, provide test method and the device of a kind of engine cooling spray nozzle simulation real vehicle duty, the present invention utilizes electric dynamometer dragging cylinder body to operate to simulate real vehicle at each speed and runs under different rotating speeds, measured by scale and video camera and record the jetting height of cooling jet, spray angle and target spot, thus observe the duty of cooling jet, for designing and developing of engine cooling spray nozzle provides strong test figure.
Test method of the present invention, technical scheme adopted for achieving the above object is to be made up of following steps:
Step one: make test unit,
A, by above for the cylinder body of engine partial demolition, to remove after the piston of cylinder interior to cylinder interior filling proper amount of machine oil;
B, cylinder body to be fixed on the stand of electric dynamometer, and the output shaft of electric dynamometer is connected with the bent axle of cylinder body;
C, on the inwall of each cylinder barrel, hang scale;
D, above cylinder body, fix video camera;
E, make the bent axle oil weir suitable with internal diameter of cylinder, and be fixed in each cylinder barrel by each bent axle oil weir, the bent axle oil weir in each cylinder barrel is in by cooling jet;
F, make the top that a transparent cylinder body oil weir is fixed on cylinder body;
Step 2: carry out the test of simulation real vehicle duty,
G, start electric dynamometer and under different rotating speeds, drag cylinder body run, measure and be recorded in the jetting height of cooling jet under different rotating speeds, spray angle and target spot respectively by scale and video camera;
H, with the test figure obtained in g step to judge whether cooling jet meets designing requirement.
As the further improvement of this method, the machine oil injected in cylinder body in described a step is 2.5L, reduces the consumption of machine oil under the prerequisite meeting testing requirements.
As the further improvement of this method, in described step c, the position at scale place and the spray site position of cooling jet are at a distance of 10mm, and this distance can make scale accurately measure the jetting height of cooling jet.
As the further improvement of this method, in described g step, the rotating speed of electric dynamometer is 750-2500rpm, normal revolution when this range of speeds is running car, thus simulation real vehicle duty, improve test accuracy.
Test unit of the present invention, comprises cylinder body and the electric dynamometer of opened upper end, and the output shaft of described electric dynamometer connects the bent axle of cylinder body, and the inwall of described cylinder body is hung with scale, and the top of cylinder body is provided with video camera.
As the further improvement of this device, bent axle oil weir is provided with in each cylinder barrel of described cylinder body, the edge, side of bent axle oil weir is in by the cooling jet in cylinder barrel, the contact internal walls of remaining edge and cylinder barrel, the machine oil splashed when can stop crankshaft rotating by bent axle oil weir, avoid the shooting effect affecting video camera because of machine oil splashes, thus the accuracy of warranty test result.
As the further improvement of this device, the coboundary of described cylinder body is fixed with cylinder body oil weir, can be stopped the machine oil splashing to cylinder body outside, spray by cylinder body oil weir completely.
As the further improvement of this device, described bent axle oil weir is fixed in cylinder barrel by inverted U-shaped hanger, is convenient to installation and removal.
As the further improvement of this device, described cylinder body oil weir is transparent panel, is convenient to the duty of observing cylinder interior cooling jet.
The invention has the beneficial effects as follows: test method of the present invention utilizes electric dynamometer to drag cylinder body and operates under different rotating speeds and simulate the state that real vehicle runs under different rotating speeds, the jetting height of cooling jet is measured again by scale, spray angle and the target spot of record cooling jet is taken by video camera, thus know the duty of cooling jet under different rotating speeds, and then provide strong test figure for designing and developing of engine cooling spray nozzle; Test unit structural design advantages of simple of the present invention, directly utilizes the stand of electric dynamometer to complete test, and decrease the cost making separately test-bed, it is simple and efficient to handle, without the need to training separately testing crew.
Accompanying drawing illustrates:
Fig. 1 is the structural representation of test unit in the present invention;
Fig. 2 is the structural representation of bent axle oil weir in the present invention.
Embodiment:
For 4G15T h type engine h, the specific embodiment of the present invention is described below:
With reference to Fig. 1, the test method of engine cooling spray nozzle simulation real vehicle duty of the present invention is made up of following steps:
Step one: make test unit,
A, by cylinder body more than 1 partial demolition of engine, to remove after the piston of cylinder body 1 inside to cylinder body 1 inside filling 2.5L machine oil;
B, cylinder body 1 to be fixed on the stand of electric dynamometer 2, and the output shaft 21 of electric dynamometer 2 is connected with the bent axle of cylinder body 1;
C, on the inwall of 4 cylinder barrels 11, hang scale 3 respectively, the position at scale 3 place and the spray site position of cooling jet 7 are at a distance of 10mm;
D, above cylinder body 1, fix video camera 4, the putting position of video camera 4 is interfered for criterion can not cause cylinder body 1 in the bed run process of electric dynamometer 2, and the magnitude setting of video camera 4 will meet the requirement of the duty of the cooling jet 7 that can photograph completely in 4 cylinder barrels 11;
E, make the bent axle oil weir 5 suitable with cylinder barrel 11 internal diameter, be suspended in 4 cylinder barrels 11 by the inverted U-shaped hanger 51 on bent axle oil weir 5 respectively by each bent axle oil weir 5, the bent axle oil weir 5 in each cylinder barrel 11 is in by cooling jet 7;
F, make the top that a transparent cylinder body oil weir 6 is fixed on cylinder body 1;
Step 2: carry out the test of simulation real vehicle duty,
G, startup electric dynamometer 2, under the rotating speed of 750rpm, 1000rpm, 1250rpm, 1500rpm, 2000rpm, 2500rpm, drag cylinder body 1 respectively run, under above rotating speed, measured the jetting height of cooling jet 7 respectively by scale 4 simultaneously, under above rotating speed, taken the jetting height, spray angle and the target spot that record cooling jet 7 by video camera 4 respectively, show that correlation test data are as shown in table 1:
The test figure of table 1 cooling jet duty
H, shown by the test figure of table 1, when cylinder body 1 runs under above each rotating speed, the duty of cooling jet 7 meets designing requirement.
See figures.1.and.2, test unit of the present invention, comprises cylinder body 1 and the electric dynamometer 2 of opened upper end, and the output shaft 21 of described electric dynamometer 2 connects the bent axle of cylinder body 1, and the inwall of described cylinder body 1 is hung with scale 3, and the top of cylinder body 1 is provided with video camera 4.Bent axle oil weir 5 is provided with in each cylinder barrel 11 of described cylinder body 1, one edge, place of bent axle oil weir 5 is recessed to form breach to center, it is other that this breach is in cooling jet 7, bent axle oil weir 5 is avoided to stop the injection of cooling jet 7, the remaining edge of bent axle oil weir 5 except breach and the contact internal walls of cylinder barrel 11, bent axle oil weir 5 is fixed in cylinder barrel 11 by inverted U-shaped hanger 51, and the coboundary of described cylinder body 1 is fixed with transparent cylinder body oil weir 6.
When testing, cylinder body 1 is driven to operate by electric dynamometer 2, the machine oil height that cooling jet 7 sprays is measured by scale 3, by video camera 4, the shooting of the jetting height of cooling jet 7, spray angle and target spot is recorded, the machine oil splashed when stopping crank rotation by bent axle oil weir 5, in order to avoid the machine oil splashed affects the shooting effect of video camera 4, prevent machine oil from splashing outside cylinder body 1 by cylinder body oil weir 6.
Claims (9)
1. a test method for engine cooling spray nozzle simulation real vehicle duty, is characterized in that being made up of following steps:
Step one: make test unit,
A, by cylinder body (1) the above partial demolition of engine, to remove after the inner piston of cylinder body (1) to cylinder body (1) inside filling proper amount of machine oil;
B, cylinder body (1) to be fixed on the stand of electric dynamometer (2), and the output shaft (21) of electric dynamometer (2) is connected with the bent axle of cylinder body (1);
C, on the inwall of each cylinder barrel (11), hang scale (3);
D, fix video camera (4) in the top of cylinder body (1);
E, make the bent axle oil weir (5) suitable with cylinder barrel (11) internal diameter, and each bent axle oil weir (5) is fixed in each cylinder barrel (11), it is other that the bent axle oil weir (5) in each cylinder barrel (11) is in cooling jet (7);
F, make the top that a transparent cylinder body oil weir (6) is fixed on cylinder body (1);
Step 2: carry out the test of simulation real vehicle duty,
G, start electric dynamometer (2) and under different rotating speeds, drag cylinder body (1) run, measure and be recorded in the jetting height of cooling jet (7) under different rotating speeds, spray angle and target spot respectively by scale (3) and video camera (4);
H, with the test figure obtained in g step to judge whether cooling jet (7) meets designing requirement.
2. the test method of a kind of engine cooling spray nozzle simulation real vehicle duty as claimed in claim 1, is characterized in that: the machine oil injected in cylinder body (1) in described a step is 2.5L.
3. the test method of a kind of engine cooling spray nozzle simulation real vehicle duty as claimed in claim 1, is characterized in that: in described step c, the position at scale (3) place and the spray site position of cooling jet (7) are at a distance of 10mm.
4. the test method of a kind of engine cooling spray nozzle simulation real vehicle duty as claimed in claim 1, is characterized in that: in described g step, the rotating speed of electric dynamometer is 750-2500rpm.
5. the test unit of an engine cooling spray nozzle simulation real vehicle duty, it is characterized in that: the cylinder body (1) and the electric dynamometer (2) that comprise opened upper end, the output shaft (21) of described electric dynamometer (2) connects the bent axle of cylinder body (1), the inwall of described cylinder body (1) is hung with scale (3), and the top of cylinder body (1) is provided with video camera (4).
6. the test unit of a kind of engine cooling spray nozzle simulation real vehicle duty as claimed in claim 5, it is characterized in that: in each cylinder barrel (11) of described cylinder body (1), be provided with bent axle oil weir (5), the cooling jet (7) that the edge, side of bent axle oil weir (5) is in cylinder barrel (11) is other, the contact internal walls of remaining edge and cylinder barrel (11).
7. the test unit of a kind of engine cooling spray nozzle simulation real vehicle duty as claimed in claim 5, is characterized in that: the coboundary of described cylinder body (1) is fixed with cylinder body oil weir (6).
8. the test unit of a kind of engine cooling spray nozzle simulation real vehicle duty as claimed in claim 6, is characterized in that: described bent axle oil weir (5) is fixed in cylinder barrel (11) by inverted U-shaped hanger (51).
9. the test unit of a kind of engine cooling spray nozzle simulation real vehicle duty as claimed in claim 7, is characterized in that: described cylinder body oil weir (6) is transparent panel.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109425480A (en) * | 2017-08-23 | 2019-03-05 | 北京汽车动力总成有限公司 | A kind of engine piston cooling nozzle testing stand |
| CN112781845A (en) * | 2020-12-22 | 2021-05-11 | 中国北方发动机研究所(天津) | Piston cooling nozzle performance test evaluation test bed and evaluation method thereof |
| CN113834662A (en) * | 2021-09-22 | 2021-12-24 | 哈尔滨东安汽车发动机制造有限公司 | Method for verifying influence of variable oil injection angle of engine on PN number |
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| DE10061631C1 (en) * | 2000-12-11 | 2002-07-11 | Ift Ingenieurgesellschaft Fuer | IC engine cooling circuit function evaluation method uses heating of engine cylinder spaces for simulating heat output of engine during normal running |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109425480A (en) * | 2017-08-23 | 2019-03-05 | 北京汽车动力总成有限公司 | A kind of engine piston cooling nozzle testing stand |
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