CN108519237A - A kind of test system measuring air-charging efficiencies of different cylinders for multi-cylinder internal combustion engine - Google Patents
A kind of test system measuring air-charging efficiencies of different cylinders for multi-cylinder internal combustion engine Download PDFInfo
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- CN108519237A CN108519237A CN201810381887.1A CN201810381887A CN108519237A CN 108519237 A CN108519237 A CN 108519237A CN 201810381887 A CN201810381887 A CN 201810381887A CN 108519237 A CN108519237 A CN 108519237A
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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- G01M15/08—Testing internal-combustion engines by monitoring pressure in cylinders
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Abstract
A kind of test system category technical field of internal combustion engines measuring air-charging efficiencies of different cylinders for multi-cylinder internal combustion engine, the present invention test system be connected with IC engine cylinder body inlet and inlet manifold, the microcontroller of holes probe control system, the anemobiagraph of induction air flow ratio measuring system, the air inlet pressure sensor of admission pressure measuring system, corner marking instrument, in-cylinder pressure sensor signal output end connect with the signal input part of data acquisition and analysis system；Holes probe position of the present invention can realize accurate in real time adjust, using the present invention, the each cylinder working cycles volumetric efficiency of two methods real time dynamic measurement multi-cylinder engine can be used simultaneously, or adjacent two working cycles uniform charge efficiency, data support, the configuration of the present invention is simple are provided to study the influence of air passage structure, valve timing and internal combustion engine operation operating mode to the influence and charge of single cylinder charge efficiency to internal combustion engine Combustion Cycle Variability, easy to operate, control accuracy is high.
Description
Technical field
The invention belongs to technical field of internal combustion engines, and in particular to a kind of test measuring air-charging efficiencies of different cylinders for multi-cylinder internal combustion engine
System.
Background technology
Internal combustion engine is obtained due to having many advantages, such as the high thermal efficiency, good reliability in social production and life
Very extensive application.(the ratio between practical aeration quantity and theoretical mass of charge can evaluate the complete of intake process to internal combustion engine volumetric efficiency
Kind degree, is the important indicator of measured engine air inlet performance, is to determine that combustion engine powered property is economical important with emission performance
Factor.
It is well known that the flowing of gas is pulsation in reciprocating internal combustion engine gas handling system, especially multi-cylinder engine, by
Influencing each other between each cylinder makes the increasingly complex change of gas flowing in gas handling system, has strong non-stationary flow
Property.The charge for being possible to cause entry into each cylinder in intake process is uneven, to be possible to cause internal combustion engine
The uniformity that works is deteriorated, and caused consequence is power of IC engine decline, economy and deterioration of emission, it is also possible to reduce gas
The service life of cylinder.
The variation of cycle air inflow then can directly influence the variation of in-cylinder pressure, and the dynamic characteristic for recycling air inlet directly affects
Charge mixed process in cylinder, and then the cyclical variations of in-cylinder combustion are had a major impact.Irregular combustion is it in Engine
One big feature, wherein the Combustion Cycle Variability between each cycle is particularly evident, cyclical variations are excessive, can make in gasoline engine oil consumption
It rises, power declines, rough running and pollutant discharge amount rise.
Enter the air inflow of each cylinder by measurement to study the internal combustion engine caused by each cylinder charge is uneven
Work process inhomogeneities is that engine testing field needs the important topic solved.And effect is inflated to each cylinder charge
The measurement of rate, especially it is smaller change engine original structure on the basis of, the test system of comparative maturity so far there is not yet
To the report of relevant information, the common charge measured by measuring air inlet total flow method, is being averaged for each cylinder of engine
Charge, it is clear that it cannot reflect the charge situation of each cylinder.
Invention content
The purpose of the present invention is to provide it is a kind of can be with the test of real time dynamic measurement air-charging efficiencies of different cylinders for multi-cylinder internal combustion engine
System.
Test system according to the present invention can be simultaneously by flow velocity-pressure wave method (during measurement air-intake of combustion engine
Gas pressure wave and speed wave and the charge and volumetric efficiency and pressure of each cylinder are obtained by calculating in each cylinder inlet manifold
Reeb method (is obtained by gas pressure in each cylinder inlet manifold during measurement air-intake of combustion engine and corresponding inner pressure of air cylinder wave
The charge i.e. volumetric efficiency of each cylinder is taken come a certain working cycles volumetric efficiency or phase of each cylinder of huge discharge internal combustion engine in obtaining
Adjacent two working cycles uniform charge efficiency, and the measurement accuracy difference of two methods can be compared.
The present invention is adopted by holes probe control system A, induction air flow ratio measuring system B, admission pressure measuring system C, data
Set analysis system D, holder E, cylinder body 1, corner marking instrument 2, in-cylinder pressure sensor 3, conducting wire I 4, inlet manifold 5, asbestos washer I 6,
Conducting wire II 7, asbestos washer II 8, conducting wire VI 28, conducting wire VII 29, conducting wire VIII 30, nut I 38, nut II 39 form, wherein testing the speed
The control signal input of microcontroller 26 is believed through the control of conducting wire VI 28 and data acquisition and analysis system D in control system of popping one's head in A
The connection of number output end, left supported plate I 9 of the left risers 40 through hole group II 12 and holder E in holes probe control system A is affixed, the right side
Support plate II 43 is fixedly connected through hole group III 14 with I 17 bolt of right supported plate of holder E, drive link 42 in holes probe control system A
The top of air flow rate sensor 20 in induction air flow ratio measuring system B is placed on through its through-hole, and solid through nut I 38 and nut II 39
It connects；Signal of the signal output end of anemobiagraph in induction air flow ratio measuring system B through conducting wire VII 29 Yu data acquisition and analysis system D
Input terminal connects, and the lower end and the hole I 13 of holder E of the guide rail sleeve 34 in induction air flow ratio measuring system B are affixed；Admission pressure measures
The upper end of system C middle sleeves 47 and the hole II 19 of holder E are affixed, air inlet pressure sensor 31 in admission pressure measuring system C
Signal output end is connect through conducting wire VIII 30 with the signal input part of data acquisition and analysis system D；The left side of left supported plate I 9 in holder E
Affixed through asbestos washer I 6 and the air intake duct right side of cylinder body 1, the right side of right supported plate I 17 is through asbestos washer II 8 and air inlet in holder E
The left side of manifold 5 is affixed, and 18 left end of middle pipe of holder E is connected to the air intake duct of cylinder body 1,18 right end of middle pipe of holder E and air inlet
Manifold 5 is connected to；The signal output end of corner marking instrument 2 is connect through conducting wire II 7 with data acquisition and analysis system D signal input parts, footmark
Instrument 2 and the bent axle of cylinder body 1 are screwed；The signal output end of in-cylinder pressure sensor 3 is through conducting wire I 4 and data collection and analysis system
The signal input part connection of system D, in-cylinder pressure sensor 3 and the cylinder cap top of cylinder body 1 are affixed.
The holes probe control system A is by stepper motor 21, conducting wire IV 23, conducting wire V 24, microcontroller 26, voltage stabilizing electricity
Source 27, left risers 40, transverse slat 41, drive link 42, right risers 43, leading screw 44, guide rail 45, sliding block 46 and bottom plate 47 form, transverse slat
41 left ends and 40 right side of left risers are affixed, and 41 right end of transverse slat and 43 left side of right risers are affixed, and the pedestal of stepper motor 21 is fixed in
Transverse slat 41 is to the right.
42 nearly left end of drive link be equipped with through-hole, 42 right end of drive link and 46 left side of sliding block are affixed, the centre bore of sliding block 46 and
Leading screw 44 is threadedly coupled, and 46 right part of sliding block is slidably connected with guide rail 45.
45 upper end of guide rail with it is affixed below 21 shell of stepper motor, 45 lower end of guide rail and bottom plate 47 are affixed.
44 upper end of leading screw and the output shaft of stepper motor 21 are affixed, and 44 lower end of leading screw is connect with the central movable of bottom plate 47.
27 output end of regulated power supply is connect through conducting wire V 24 with the power input of stepper motor 21, the control of stepper motor 21
Signal input part processed is connect through conducting wire IV 23 with 26 control signal output of microcontroller.
The gas flow rate measuring system B is by air flow rate sensor 20, conducting wire III 22, anemobiagraph 25, holes probe
32, sealing ring I 33, guide rail sleeve 34, bottom end cover 35, sealing ring II 36, upper end cover 37 form, 37 sealed ring II 36 of upper end cover with
34 threaded upper ends of guide rail sleeve connect, and 35 sealed ring I 33 of bottom end cover is threadedly coupled with 34 end of guide rail sleeve.
20 lower part of air flow rate sensor is placed in guide rail sleeve 34, and is slidably connected with 34 inner wall of guide rail sleeve；Gas flow rate
20 signal output end of sensor is connect through conducting wire III 22 with 25 signal input part of anemobiagraph.
The admission pressure measuring system C is by air inlet pressure sensor 31, casing 48, sealing ring III 49,50 groups of bottom cover
At 31 top of air inlet pressure sensor is located in casing 48, and is connect with 48 inner thread of casing；Bottom cover 49 and 48 lower end of casing
It is threadedly coupled；Sealing ring III 49 is placed between 48 bottom end of casing and bottom cover 50, III 49 inner ring of sealing ring and air inlet pressure sensor
31 contact positions closely connect.
The holder E is made of left supported plate I 9, right supported plate I 17 and middle pipe 18, wherein left supported plate I 9 is equipped with mesoporous I
11, the circumference of mesoporous I 11 is externally provided with hole group I 10, and hole group I 10 is made of 4 holes, and I 11 top of mesoporous is equipped with hole group II 12；Middle pipe
18 upper centers are equipped with hole I 13, and 18 downside center of middle pipe is equipped with hole II 19；Right supported plate I 17 is equipped with mesoporous II 16, mesoporous II 16
Circumference be externally provided with hole group IV 15, hole group IV 15 is made of 4 holes, and the top of mesoporous II 16 is equipped with hole group III 14；18 left end of middle pipe
Affixed with the mesoporous I 11 of left supported plate I 9,18 right end of middle pipe and the mesoporous II 16 of right supported plate I 17 are affixed.
The holes probe position of the present invention can realize accurate adjusting in real time, with the application of the invention, two methods can be used simultaneously,
The each cylinder working cycles volumetric efficiency of real time dynamic measurement multi-cylinder engine or adjacent two working cycles uniform charge effect
Rate, to study air passage structure, the influence and charge of valve timing and internal combustion engine operation operating mode to single cylinder charge efficiency
Influence to internal combustion engine Combustion Cycle Variability provides data and supports that the configuration of the present invention is simple is easy to operate, and control accuracy is high.
Description of the drawings
Fig. 1 is the test system general illustration for measuring air-charging efficiencies of different cylinders for multi-cylinder internal combustion engine
Fig. 2 is supporting structure schematic diagram
Fig. 3 is test system overall installation schematic diagram
Fig. 4 is holes probe control system and induction air flow ratio measuring system schematic diagram
Fig. 5 is admission pressure measuring system scheme of installation
Fig. 6 is engine bench test system general illustration
Fig. 7 be 3 cylinder of a certain working cycles measure section on mean flow rate and point velocity with crank angle change curve
Wherein：1 is at away from pipe axis 2.5mm；2 is at away from pipe axis 10mm；3 be section mean flow rate；
Fig. 8 measures the intake pressure wave on section with crank angle change curve for 3 cylinder of a certain working cycles
Wherein：A. holes probe control system B. induction air flow ratios measuring system C. admission pressures measuring system D. data
I 5. inlet manifold of acquisition analysis system E. holder 1. cylinder body, 2. corner marking instrument, 3. in-cylinder pressure sensor, 4. conducting wires, 6. stone
I 12. hole group of cotton pad piece I 7. conducting wire, II 8. asbestos washer, II 9. left supported plate, I 10. hole group, I 11. mesoporous, II 13. hole I
14. 19. hole of hole group III 15. hole group, IV 16. mesoporous, II 17. right supported plate, I 18. middle pipe, II 20. air flow rate sensor
21. 26. microcontroller of stepper motor 22. conducting wire, III 23. conducting wire, IV 24. conducting wire, V 25. anemobiagraph, 27. regulated power supply 28.
33. sealing ring of conducting wire VI 29. conducting wire, VII 30. conducting wire, VIII 31. air inlet pressure sensor, 32. holes probe, I 34. guide rail sleeve
35. II 40. left risers of bottom end cover 36. sealing ring, II 37. upper end cover, 38. nut, I 39. nut, 41. transverse slat 42. is driven
49. sealing ring of bar 43. right risers, 44. lead screw, 45. guide rail, 46. sliding block, 47. bottom plate, 48. casing, III 50. bottom cover 51.
Ⅸ 55. inlet manifold of 52. dynamometer machine of multi-cylinder engine and its 53. flowmeter of control system, 54. conducting wire
Specific implementation mode
Below according to the particular content and specific embodiment of the description of the drawings present invention.
As shown in Figure 1, the present invention measures system by holes probe control system A, induction air flow ratio measuring system B, admission pressure
System C, data acquisition and analysis system D, holder E, cylinder body 1, corner marking instrument 2, in-cylinder pressure sensor 3, conducting wire I 4, inlet manifold 5, stone
Cotton pad piece I 6, conducting wire II 7, asbestos washer II 8, conducting wire VI 28, conducting wire VII 29, conducting wire VIII 30, nut I 38, nut II 39 form,
The control signal input of microcontroller 26 is through conducting wire VI 28 and data acquisition and analysis system D in wherein holes probe control system A
Control signal output connection, left supported plate I 9 of the left risers 40 through hole group II 12 Yu holder E in holes probe control system A
Affixed, right supported plate II 43 is fixedly connected through hole group III 14 with I 17 bolt of right supported plate of holder E, is passed in holes probe control system A
Lever 42 is placed on the top of air flow rate sensor 20 in induction air flow ratio measuring system B through its through-hole, and through nut I 38 and nut
II 39 is affixed；The signal output end of anemobiagraph in induction air flow ratio measuring system B is through conducting wire VII 29 and data acquisition and analysis system D
Signal input part connection, the lower end and the hole I 13 of holder E of the guide rail sleeve 34 in induction air flow ratio measuring system B be affixed；Air inlet pressure
The upper end of force measuring system C middle sleeves 47 and the hole II 19 of holder E are affixed, and admission pressure senses in admission pressure measuring system C
The signal output end of device 31 is connect through conducting wire VIII 30 with the signal input part of data acquisition and analysis system D；Left supported plate I 9 in holder E
The left side it is affixed through asbestos washer I 6 and the air intake duct right side of cylinder body 1, the right side of right supported plate I 17 is through asbestos washer II 8 in holder E
Affixed with the left side of inlet manifold 5,18 left end of middle pipe of holder E is connected to the air intake duct of cylinder body 1,18 right end of middle pipe of holder E
It is connected to inlet manifold 5；The signal output end of corner marking instrument 2 connects through conducting wire II 7 and data acquisition and analysis system D signal input parts
It connects, corner marking instrument 2 and the bent axle of cylinder body 1 are screwed；The signal output end of in-cylinder pressure sensor 3 is acquired through conducting wire I 4 and data
The signal input part of analysis system D connects, and in-cylinder pressure sensor 3 and the cylinder cap top of cylinder body 1 are affixed.
As shown in Figure 3 and Figure 4, the holes probe control system A by stepper motor 21, conducting wire IV 23, conducting wire V 24,
Microcontroller 26, regulated power supply 27, left risers 40, transverse slat 41, drive link 42, right risers 43, leading screw 44, guide rail 45,46 and of sliding block
Bottom plate 47 forms, and 41 left end of transverse slat and 40 right side of left risers are affixed, and 41 right end of transverse slat and 43 left side of right risers are affixed, stepper motor
It is to the right that 21 pedestal is fixed in transverse slat 41.
42 nearly left end of drive link be equipped with through-hole, 42 right end of drive link and 46 left side of sliding block are affixed, the centre bore of sliding block 46 and
Leading screw 44 is threadedly coupled, and 46 right part of sliding block is slidably connected with guide rail 45.
45 upper end of guide rail with it is affixed below 21 shell of stepper motor, 45 lower end of guide rail and bottom plate 47 are affixed.
44 upper end of leading screw and the output shaft of stepper motor 21 are affixed, and 44 lower end of leading screw is connect with the central movable of bottom plate 47.
27 output end of regulated power supply is connect through conducting wire V 24 with the power input of stepper motor 21, the control of stepper motor 21
Signal input part processed is connect through conducting wire IV 23 with 26 control signal output of microcontroller.
As shown in Figure 3 and Figure 4, the gas flow rate measuring system B is by air flow rate sensor 20, conducting wire III 22, wind
Fast instrument 25, holes probe 32, sealing ring I 33, guide rail sleeve 34, bottom end cover 35, sealing ring II 36, upper end cover 37 form, upper end cover
37 sealed rings II 36 are connect with 34 threaded upper ends of guide rail sleeve, and 35 sealed ring I 33 of bottom end cover is threadedly coupled with 34 end of guide rail sleeve.
20 lower part of air flow rate sensor is placed in guide rail sleeve 34, and is slidably connected with 34 inner wall of guide rail sleeve；Gas flow rate
20 signal output end of sensor is connect through conducting wire III 22 with 25 signal input part of anemobiagraph.
As shown in figure 5, the admission pressure measuring system C is by air inlet pressure sensor 31, casing 48, sealing ring III
49, bottom cover 50 forms, and 31 top of air inlet pressure sensor is located in casing 48, and is connect with 48 inner thread of casing；Bottom cover 49
It is connect with 48 lower thread of casing；Sealing ring III 49 is placed between 48 bottom end of casing and bottom cover 50, III 49 inner ring of sealing ring with into
31 contact position of air pressure force snesor closely connects.
As shown in Fig. 2, the holder E is made of left supported plate I 9, right supported plate I 17 and middle pipe 18, wherein on left supported plate I 9
Equipped with mesoporous I 11, the circumference of mesoporous I 11 is externally provided with hole group I 10, and hole group I 10 is made of 4 holes, and I 11 top of mesoporous is equipped with hole group
Ⅱ12；18 upper center of middle pipe is equipped with hole I 13, and 18 downside center of middle pipe is equipped with hole II 19；Right supported plate I 17 is equipped with mesoporous II
16, the circumference of mesoporous II 16 is externally provided with hole group IV 15, and hole group IV 15 is made of 4 holes, and II 16 top of mesoporous is equipped with hole group III 14；
18 left end of middle pipe and the mesoporous I 11 of left supported plate I 9 are affixed, and 18 right end of middle pipe and the mesoporous II 16 of right supported plate I 17 are affixed.
As shown in fig. 6, test system is specifically in test-bed position, the test system be mounted on right end cylinder into
Between gas manifold 5 and the cylinder body right end air intake duct of multi-cylinder engine 51.Wherein dynamometer machine and its control system 52 are for controlling
51 operating condition of multi-cylinder engine, signal of the signal output end through conducting wire Ⅸ 54 Yu data acquisition and analysis system D of flowmeter 53
Input terminal is connected, and for measuring 55 air inlet total amount of inlet manifold, test system, which can test, flows through inlet manifold 5 into corresponding list
The charge of a cylinder, and then calculate a certain working cycles volumetric efficiency of the cylinder or certain adjacent two working cycles inflation effect
The average value of rate.
Official testing first demarcates holes probe control system A before starting, and makes to control on data acquisition and analysis system D
Signal input window corresponds to input numerical value and is corresponded with deep distance of the holes probe 32 in inlet manifold 5.Calibration finishes,
Multi-cylinder engine 51 is operated under wanted measurement condition, starts to test.Two are inputted first on data acquisition and analysis system D
Test point position numerical value, data acquisition and analysis system D control signal outputs control signal by conducting wire VI 28 to microcontroller 26
Input terminal transmission control procedure code, microcontroller 26 are controlled by it signal output end by leading according to incoming control routine program
Line IV 23 sends out pulse control signal to 26 control signal input of stepper motor, and the lead screw 44 of stepper motor 21 is in control signal
Control under turn an angle, lead screw 44 with about 45 movable slider move vertically certain distance, sliding block 45 drive drive link 41
With the lower same distance that moves vertically thereon, drive link 41 finally drives air flow rate sensor 20 to slide into the in guide rail sleeve 34
One test point position, you can start to measure a certain working cycles induction air flow ratio with crank angle change curve (step motor control
Precision 0.1mm, sliding block highest sliding speed 600mm/s can meet control positional precision and time precision requirement.By being surveyed
Internal combustion engine is middle huge discharge, so air-intake of combustion engine pipe diameter is relatively large, holes probe diameter relative to air inlet pipe diameter compared with
It is small, the movement of pipe interior air-flow is influenced can be ignored.Air inlet cycle terminates, and holes probe 32 is under the drive of stepper motor 26
The second point position can be moved quickly into, next air inlet is tested and recycles induction air flow ratio with crank angle changing value.Due to sliding block 43
Movement speed is sufficiently fast, therefore holes probe 32 can be moved to the second point position in time before the cycle of air inlet next time,
Do not influence test process.Air flow rate sensor 20 measures flow velocity signal through III 22 incoming anemobiagraph of conducting wire, 25 signal input part,
Anemobiagraph 25 is handled by its signal output end the letter passed to through conducting wire VII 29 on data acquisition and analysis system D to input signal
Number input terminal, internal system has charge amplifier, processing can be amplified to signal, and can be converted digital signal storage and arrive
In memory, while being shown on data acquisition and analysis system D display screens.Air inlet pressure sensor 31 measures admission pressure simultaneously
Value, measures pressure signal and passes to data acquisition and analysis system D signal input parts through conducting wire VIII 30, in-cylinder pressure sensor 3 is simultaneously
In-cylinder pressure value is measured, pressure signal is measured and passes to data acquisition and analysis system D signal input parts through conducting wire I 4.Due in system
There is charge amplifier in portion, can be amplified processing to boost pressure signal and cylinder pressure signal, and can be converted digital letter
Number storage is shown on data acquisition and analysis system D display screens in memory.
Data acquisition and analysis system D is based on corner marking instrument 2, and (crank angle resolution ratio is that 0.2deg.CA synchronizes to obtain bent axle turn
Angle signal, it is average with crank angle change curve, certain adjacent two working cycles that system handles to obtain certain working cycles induction air flow ratio
Induction air flow ratio with crank angle change curve, a certain working cycles admission pressure and in-cylinder pressure with crank angle change curve,
And it stores and is shown on component computer display screen.
It is simultaneously that the test system is in parallel, access the test system in each inlet manifold of Multi-Cylinder Diesel Engine, you can pass through
Primary experiment while testing Multi-Cylinder Diesel Engine each cylinder charge efficiency.
By two point velocities, pressure value and the in-cylinder pressure in inlet manifold corresponding to each cylinder for collecting with song
Shaft angle changing value and other raw data associateds, the solidification software program established by calculation formula can be obtained Multi-Cylinder Diesel Engine list
The uniform charge efficiency of the adjacent working cycles twice of a cylinder and the volumetric efficiency of a certain working cycles.And stream can be compared
The difference of two methods of speed-pressure wave method and pressure wave method and compared with measuring complete machine volumetric efficiency, judges the survey of two methods
Try precision.
Embodiment：
Certain gasoline engine is under 2200 revs/min, 3/4 aperture operating mode of air throttle, using the test system data measured and root
The uniform charge efficiency value of certain two adjacent working cycles is calculated separately according to flow velocity-pressure wave method and pressure wave method and a certain work follows
The volumetric efficiency of ring.
Wherein：Two point positions are y1=16mm, y2=8.5mm internal combustion engine data acquisition and analysis systems acquire flow velocity and pressure
Crank angle resolution ratio is 0.1deg.CA when wave signal.
Using above-mentioned test system data measured and volumetric efficiency and difference two that each cylinder different operating recycles is calculated
The average value of operated adjacent circulation inflatable efficiency, as shown in Table 1 and Table 2.Induction air flow ratio and intake pressure wave become with crank angle
The partial trace of change is as shown in Figure 7 and Figure 8.
1 pressure wave method of table obtains the volumetric efficiency of each cylinder different operating cycle
2 flow velocitys of table-pressure wave method obtains the different two adjacent working cycles volumetric efficiency average values of each cylinder
It can be seen that from upper table, be utilized respectively each cylinder of flow velocity-pressure wave and pressure wave method actual measurement data and calculating not
With the volumetric efficiency between working cycles there are notable difference, there is also differents between each cycle of same cylinder.
While measuring multi-cylinder volumetric efficiency, the average value of complete machine volumetric efficiency under the operating mode has been measuredSimultaneously will
1,2 data of table sum it up the average value η that can averagely obtain complete machine volumetric efficiencyvm。
The average value of volumetric efficiency：
Wherein：N is engine speed (r/min)；I is number of cylinders；G is air inlet total amount (m^3/h.
It is calculated by above-mentioned formula according to data measured：
The complete machine volumetric efficiency average value η that flow velocity-pressure wave method obtainsvm=0.9101
The complete machine volumetric efficiency average value η that pressure wave method obtainsvm=0.9089
From data above it is found that the average value of complete machine volumetric efficiency is obtained with according to flow velocity-pressure wave method and pressure wave method
Complete machine volumetric efficiency average value three have good consistency.This can illustrate completely using each acquired in this test system
The data of the average value of different two adjacent working cycles volumetric efficiencies are correct to cylinder different operating circulation inflatable efficiency with each cylinder
And it is practicable.The measurement result of two methods is almost the same, coincide preferably with the measured value of complete machine volumetric efficiency, can
Degree of irregularity for examining or check and judging air inlet between each cylinder different operating of Multi-Cylinder Diesel Engine recycles.
The flow velocity that the present invention uses-pressure wave method can measure the average value of certain two adjacent working cycles volumetric efficiency, but only
Suitable for round or approximate circle inlet manifold section, pressure wave method can measure each cylinder compared with flow velocity-pressure wave method
One working cycles volumetric efficiency value, and test work load is smaller, cost is relatively low.Meanwhile being averaged with complete machine volumetric efficiency at present
Value come replace the average value of each cylinder volumetric efficiency and go research multi-cylinder engine each cylinder air inflow and volumetric efficiency inhomogeneities
It is coarse, unscientific.The present invention can dynamically be accurately obtained the inflation of each cylinder working cycles of multi-cylinder engine in real time
The average value of efficiency value two working cycles volumetric efficiency adjacent with certain, for further research each cylinder intake process of multi-cylinder engine
The data that inhomogeneities provides science are supported.
Claims (5)
1. a kind of test system measuring air-charging efficiencies of different cylinders for multi-cylinder internal combustion engine, which is characterized in that by holes probe control system
(A), induction air flow ratio measuring system (B), admission pressure measuring system (C), data acquisition and analysis system (D), holder (E), cylinder body
(1), corner marking instrument (2), in-cylinder pressure sensor (3), conducting wire I (4), inlet manifold (5), asbestos washer I (6), conducting wire II (7),
Asbestos washer II (8), conducting wire VI (28), conducting wire VII (29), conducting wire VIII (30), nut I (38), nut II (39) composition, wherein
The control signal input of microcontroller (26) is through conducting wire VI (28) and data acquisition and analysis system in holes probe control system (A)
(D) control signal output connects, and the left risers (40) in holes probe control system (A) are through hole group II (12) and holder
(E) left supported plate I (9) is affixed, and right supported plate I (17) bolt of right supported plate II (43) through hole group III (14) and holder (E), which is fixed, to be connected
It connects, drive link (42) is placed on gas flow rate in induction air flow ratio measuring system (B) through its through-hole and passes in holes probe control system (A)
The top of sensor (20), and it is affixed through nut I (38) and nut II (39)；Anemobiagraph in induction air flow ratio measuring system (B)
Signal output end is connect through conducting wire VII (29) with the signal input part of data acquisition and analysis system (D), induction air flow ratio measuring system
(B) lower end and the hole I (13) of holder (E) of the guide rail sleeve (34) in are affixed；Admission pressure measuring system (C) middle sleeve (47)
Upper end and the hole II (19) of holder (E) are affixed, the signal output of air inlet pressure sensor (31) in admission pressure measuring system (C)
End is connect through conducting wire VIII (30) with the signal input part of data acquisition and analysis system (D)；The left side of left supported plate I (9) in holder (E)
Affixed through asbestos washer I (6) and the air intake duct right side of cylinder body (1), the right side of right supported plate I (17) is through asbestos washer in holder (E)
The left side of II (8) and inlet manifold (5) is affixed, and middle pipe (18) left end of holder (E) is connected to the air intake duct of cylinder body (1), holder
(E) middle pipe (18) right end is connected to inlet manifold (5)；The signal output end of corner marking instrument (2) is acquired through conducting wire II (7) and data
Analysis system (D) signal input part connects, and corner marking instrument (2) and the bent axle of cylinder body (1) are screwed；In-cylinder pressure sensor (3)
Signal output end connect with the signal input part of data acquisition and analysis system (D) through conducting wire I (4), in-cylinder pressure sensor (3)
It is affixed with the cylinder cap top of cylinder body (1).
2. the test system as described in claim 1 for measuring air-charging efficiencies of different cylinders for multi-cylinder internal combustion engine, which is characterized in that described
Holes probe control system (A) is by stepper motor (21), conducting wire IV (23), conducting wire V (24), microcontroller (26), regulated power supply
(27), left risers (40), transverse slat (41), drive link (42), right risers (43), leading screw (44), guide rail (45), sliding block (46) and bottom
Plate (47) forms, and transverse slat (41) left end and left risers (40) right side are affixed, and transverse slat (41) right end and right risers (43) left side are affixed,
It is to the right that the pedestal of stepper motor (21) is fixed in transverse slat (41)；The nearly left end of drive link (42) is equipped with through-hole, drive link (42) right end
Affixed with sliding block (46) left side, the centre bore of sliding block (46) is threadedly coupled with leading screw (44), sliding block (46) right part and guide rail (45)
It is slidably connected；Guide rail (45) upper end with it is affixed below stepper motor (21) shell, guide rail (45) lower end and bottom plate (47) are affixed；Silk
Thick stick (44) upper end and the output shaft of stepper motor (21) are affixed, and leading screw (44) lower end is connect with the central movable of bottom plate (47)；Surely
Voltage source (27) output end is connect through conducting wire V (24) with the power input of stepper motor (21), the control of stepper motor (21)
Signal input part is connect through conducting wire IV (23) with microcontroller (26) control signal output.
3. the test system as described in claim 1 for measuring air-charging efficiencies of different cylinders for multi-cylinder internal combustion engine, which is characterized in that described
Gas flow rate measuring system (B) is by air flow rate sensor (20), conducting wire III (22), anemobiagraph (25), holes probe (32), close
Seal ring I (33), guide rail sleeve (34), bottom end cover (35), sealing ring II (36, upper end cover (37) composition, upper end cover (37) sealed ring
(34 threaded upper ends are connect, and (34 ends are threadedly coupled the sealed ring I (33) of bottom end cover (35), gas with guide rail sleeve with guide rail sleeve for II (36)
Body flow sensor (20) lower part is placed in guide rail sleeve (34), and is slidably connected with guide rail sleeve (34) inner wall；Gas flow rate senses
Device (20) signal output end is connect through conducting wire III (22) with anemobiagraph (25) signal input part.
4. the test system as described in claim 1 for measuring air-charging efficiencies of different cylinders for multi-cylinder internal combustion engine, which is characterized in that described
Admission pressure measuring system (C) is made of air inlet pressure sensor (31), casing (48), sealing ring III (49), bottom cover (50), into
Air pressure force snesor (31) top is located in casing (48), and is connect with casing (48) inner thread；Bottom cover (49) and casing
(48) lower thread connects；Sealing ring III (49) is placed between casing (48) bottom end and bottom cover (50), sealing ring III (49) inner ring
It is closely connect with air inlet pressure sensor (31) contact position.
5. the test system as described in claim 1 for measuring air-charging efficiencies of different cylinders for multi-cylinder internal combustion engine, which is characterized in that described
Holder (E) is made of left supported plate I (9), right supported plate I (17) and middle pipe (18), wherein and left supported plate I (9) is equipped with mesoporous I (11),
The circumference of mesoporous I (11) is externally provided with hole group I (10), and hole group I (10) is made of 4 holes, and hole group II is equipped with above mesoporous I (11)
(12)；Middle pipe (18) upper center is equipped with hole I (13), and center is equipped with hole II (19) on the downside of middle pipe (18)；It is set on right supported plate I (17)
There are mesoporous II (16), the circumference of mesoporous II (16) to be externally provided with hole group IV (15), hole group IV (15) is made of 4 holes, mesoporous II
(16) top is equipped with hole group III (14)；Middle pipe (18) left end and the mesoporous I (11) of left supported plate I (9) are affixed, middle pipe (18) right end with
The mesoporous II (16) of right supported plate I (17) is affixed.
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| CN201810381887.1A CN108519237B (en) | 2018-04-26 | 2018-04-26 | Test system for measuring inflation efficiency of each cylinder of multi-cylinder internal combustion engine |
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Cited By (1)
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| CN113405764A (en) * | 2021-08-19 | 2021-09-17 | 潍柴动力股份有限公司 | Detection equipment and detection method for detecting airway consistency |
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| CN108519237B (en) | 2023-09-22 |
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