CN104132775B - Supercharging gasoline engine super detonation assay device and method of testing - Google Patents
Supercharging gasoline engine super detonation assay device and method of testing Download PDFInfo
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- CN104132775B CN104132775B CN201410337130.4A CN201410337130A CN104132775B CN 104132775 B CN104132775 B CN 104132775B CN 201410337130 A CN201410337130 A CN 201410337130A CN 104132775 B CN104132775 B CN 104132775B
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Abstract
The present invention relates to technical field of internal combustion engines, it is provided that a kind of supercharging gasoline engine super detonation assay device, including gray iron, piston, inlet valve, exhaust valve and spark plug；Inlet valve and exhaust valve have been connected respectively air inlet pipeline and gas exhaust piping；Being sequentially provided with air inlet temperature control pressure stabilizing cavity, air throttle, microgranule charging point and fuel injector on the airintake direction of air inlet pipeline, microgranule charging point is used for filling simulation early combustion particle, and microgranule charging point is provided with temperature control heating system, is used for heating simulation early combustion particle；Gas exhaust piping is provided with exhaust analyzer；The inside of cylinder body is provided with cylinder pressure sensor.Pass through said apparatus, under certain thermodynamic state, the simulation early combustion particle of different temperatures and particle diameter is injected by microgranule infusion appliance, the super detonation of generation varying strength that can be stable, cylinder body pressure oscillations information is extracted by cylinder pressure sensor, determine super detonation intensity, then launch the comprehensive research to super detonation by changing other Thermodynamics.
Description
Technical field
The present invention relates to electronic circuit mounting technology field, provide a kind of supercharging gasoline engine to surpass especially
Level knocking test device and method of testing.
Background technology
Direct-injection supercharging small displacement (Downsizing) gasoline engine can control fuel oil flexibly and spray also
Oil consumption is greatly reduced, in recent years, is just becoming the main flow of gasoline engine development.But it is the most negative at low speed
Lotus direct-injection engine with supercharger is susceptible to a kind of very harmful to electromotor, the most abundant
The Abnormal combustion phenomenon super detonation understood.Super detonation occurred before spark ignition
Early combustion, maximum outbreak pressure is times over the maximum outbreak pressure of normal combustion, in some instances it may even be possible to exceed
200bar, and along with jumbo pressure oscillation, occurring at random, to the harm of electromotor and huge
Greatly.Therefore the difficulty studying super detonation is very big, yet there are no the super detonation research of maturation
Assay device.
Ge great motor corporation of the world and engine research show: super detonation is typically in spark ignition
Early combustion occurs before.Early the cause of combustion is to occur in that focus (i.e. early combustion particle) in combustor.
Resolve the source of early combustion, understand super detonation combustion process, propose super detonation control method,
It is badly in need of exploitation and is suitable for assay device and the inspection thereof of super detonation under supercharging gasoline engine working condition
Survey method.
Summary of the invention
(1) to solve the technical problem that
It is an object of the invention to provide one and be suitable under supercharging gasoline engine working condition super quick-fried
The experimental provision of shake and detection method thereof, to resolve the source of early combustion, understand the combustion of super detonation
Burning process.
(2) technical scheme
A kind of supercharging gasoline engine super detonation assay device, including gray iron, piston, enters
Valve, exhaust valve and spark plug；
Described inlet valve and exhaust valve have been connected respectively air inlet pipeline and gas exhaust piping；Institute
State and be sequentially provided with air inlet temperature control pressure stabilizing cavity on the airintake direction of air inlet pipeline, air throttle, microgranule add
Note device and fuel injector, described microgranule charging point is used for filling simulation early combustion particle, described microgranule
Charging point is provided with temperature control heating system, is used for heating described simulation early combustion particle；In described aerofluxus
Pipeline is provided with exhaust analyzer；The inside of described cylinder body is provided with cylinder pressure sensor.
Preferably, described temperature control heating system is resistance heater.
Preferably, the compression ratio of described piston is 14-18.
Preferably, it is provided with microgranule between described microgranule charging point and air inlet pipeline and imports valve.
Preferably, described piston is steel piston.
Preferably, described fuel injector is arranged on the doorway of described inlet valve.
Preferably, described piston is driven operating by dynamometer machine.
Preferably, described simulation early combustion particle is element carbon granules, engine soot generation or metallic element.
A kind of by the supercharging gasoline engine super detonation assay device realization described in any of the above-described item
The method of testing of super detonation, comprise the following steps:
S1, by air inlet temperature control pressure stabilizing cavity, air throttle and fuel injector control piston be compressed to
The thermodynamic state (temperature, pressure and concentration) of gaseous mixture in cylinder body during stop；
S2, in cylinder body, filled the simulation early combustion particle of different temperatures by microgranule charging point, or
In cylinder body, the simulation early combustion particle of different-grain diameter is filled, it is achieved spark plug by microgranule charging point
In igniting front-bank rotor housing, combustion morning of mixed gas, causes the super detonation of varying strength；
S3, gathered the pressure in cylinder body by cylinder pressure sensor and change, extract pressure oscillations information,
Judge the intensity of super detonation in cylinder body；
S4, by air inlet temperature control pressure stabilizing cavity, air throttle and fuel injector change piston be compressed to
The thermodynamic state of mixed gas in cylinder body during stop, the different thermodynamic state factor of research is to super
The impact of level pinking.
Preferably, in step S1, by mixed gas in described exhaust analyzer feedback cylinder
Air-fuel ratio information, thus the concentration of gaseous mixture in accurate master cylinder body.
(3) beneficial effect
A kind of supercharging gasoline engine super detonation assay device of present invention offer and method of testing bag
Include gray iron, piston, inlet valve and exhaust valve；Inlet valve is the most corresponding with exhaust valve
Connect and have air inlet pipeline and gas exhaust piping；The airintake direction of air inlet pipeline is sequentially provided with air inlet
Temperature control pressure stabilizing cavity, air throttle, microgranule charging point and spark plug, microgranule charging point is used for filling
Simulation early combustion particle, microgranule charging point is provided with temperature control heating system, is used for heating simulation early combustion grain
Son；Gas exhaust piping is provided with exhaust analyzer；The inside of cylinder body is provided with cylinder pressure sensor, this
Installation cost is low, and mechanical strength is high, and industrialization prospect is good.
Piston can be controlled flexibly by air inlet temperature control pressure stabilizing cavity, air throttle and fuel injector to compress
The thermodynamic state (temperature, pressure and concentration) of gaseous mixture to cylinder body during top dead centre；Pass through
Microgranule charging point fills the simulation early combustion particle of different temperatures in cylinder body, or is filled by microgranule
Device fills the simulation early combustion particle of different-grain diameter in cylinder body, it is achieved in plug ignition front-bank rotor housing
Combustion morning of mixed gas, causes the super detonation of varying strength；Cylinder is gathered by cylinder pressure sensor
Internal pressure change, extracts pressure oscillations information, it is judged that the intensity of super detonation in cylinder body；
Cylinder when piston is compressed to top dead centre is changed by air inlet temperature control pressure stabilizing cavity, air throttle and fuel injector
The thermodynamic state of internal mixed gas, the different thermodynamic state factor of research is to super detonation
Impact.The present invention is capable of the combustion stable morning of mixed gas in cylinder body, causes stable super
Pinking, therefore, it is possible to obtain substantial amounts of super detonation test sample.
Accompanying drawing explanation
Fig. 1 is the signal of a kind of supercharging gasoline engine super detonation assay device of the embodiment of the present invention
Figure.
Fig. 2 is the cylinder of the embodiment of the present invention different temperatures simulation early super detonation of combustion particle induction
Buckle line chart.
Fig. 3 be the embodiment of the present invention cylinder body in different-grain diameter simulation early combustion particle induction super
The cylinder of pinking is buckled line chart.
Reference: 1, dynamometer machine；2, piston；3, cylinder body；4, exhaust analyzer；5、
Exhaust valve；6, cylinder cap；7, cylinder pressure sensor；8, spark plug；9, inlet valve；10、
Fuel injector；11, air throttle；12, air inlet temperature control pressure stabilizing cavity；13, microgranule imports valve；14、
Microgranule charging point；X, cylinder pressure；Y, crank angle；A1, normal temperature；a2、300℃；
a3、370℃；a4、450℃；B1,50 mesh；B3,200 mesh；B4,300 mesh.
Detailed description of the invention
Below in conjunction with the accompanying drawings and embodiment, the detailed description of the invention of the present invention is made the most in detail
Describe.Following example are used for illustrating the present invention, but are not limited to the scope of the present invention.
In describing the invention, it should be noted that unless otherwise clearly defined and limited,
Term " connects " and should be interpreted broadly, and connects for example, it may be fixing, it is also possible to be detachable
Connect, or be integrally connected；Can be to be joined directly together, it is also possible to by the indirect phase of intermediary
Even.For the ordinary skill in the art, can understand that above-mentioned term exists with concrete condition
Concrete meaning in the present invention.
As it is shown in figure 1, a kind of supercharging gasoline engine super detonation test that the embodiment of the present invention provides
Device, including cylinder body 3, cylinder cap 6, piston 2, inlet valve 9, exhaust valve 5 and spark plug
8, piston 2 and spark plug 8 are arranged in cylinder body 3, and inlet valve 9 and exhaust valve 5 are arranged on
On cylinder cap 6,
Piston 2 in cylinder body 3 is high compression ratio piston, and compression ratio is 14-18, super for producing
Level pinking provides condition, and piston 2 is steel piston, and intensity is high, will not in high intensity frequently
Damaging under the influence of super detonation, the top of piston 2 is flat-top shape, can reduce the thickness of cylinder cap 6
Spend, and piston 2 is driven operating by dynamometer machine 1, work can also be obtained during operating
The acting information of plug 2 is as reference；Inlet valve 9 and exhaust valve 5 are respectively by air intake duct and row
Air flue correspondence connects air inlet pipeline and gas exhaust piping；On the airintake direction of air inlet pipeline successively
It is provided with air inlet temperature control pressure stabilizing cavity 12, air throttle 11 and microgranule charging point 14；Described fuel injector
10 are arranged at the road junction of air intake duct, make oil gas be easier to mixing and will not remain in air inlet pipe
Lu Zhong；It is provided with Temperature controlled heater in air inlet temperature control pressure stabilizing cavity 12, is used for controlling intake air temperature.
Microgranule charging point 14 is used for filling simulation early combustion particle, and described simulation early combustion particle is permissible
Being element carbon granules, engine soot generation or metallic element, described microgranule charging point 14 is additionally provided with temperature
Control heating system, is used for heating simulation early combustion particle, and temperature control heating system can be resistance heating
Device, controls heating-up temperature flexibly by controlling the on-load voltage at resistance heater two ends, described micro-
It is provided with microgranule between grain charging point 14 and air inlet pipeline and imports valve 13, be used for controlling to inject air inlet
The amount of particle is early fired in simulation in pipeline；Gas exhaust piping is provided with exhaust analyzer 4, is used for
Air-fuel ratio information in feedback cylinder body 3, and inlet gas concentration can be controlled according to feedback information, make dense
Degree parameter is the clearest and the most definite on the impact of super detonation；The inside of cylinder body 3 is provided with cylinder pressure sensor 7,
Pressure change in gathering cylinder body 3, extracts pressure oscillations information, studies super detonation,
Described cylinder pressure sensor 7 connects computer, for the number described cylinder pressure sensor being detected
According to processing.
It is capable of a kind of grade of pinking by above-mentioned supercharging gasoline engine super detonation assay device
Method of testing, specifically includes following steps:
S1, by air inlet temperature control pressure stabilizing cavity 12, air throttle 11 and fuel injector 10 control live
Thermodynamic state that plug 2 is compressed to gaseous mixture in cylinder body 3 during top dead centre (temperature, pressure and dense
Degree), and the air-fuel ratio letter of mixed gas in cylinder is fed back also by described exhaust analyzer 4
Breath, thus the concentration of gaseous mixture in accurately controlling cylinder body 3.
S2, in cylinder body 3, filled the simulation early combustion grain of different temperatures by microgranule charging point 14
Son, or in cylinder body 3, the simulation early combustion particle of different-grain diameter is filled by microgranule charging point 14,
Realize spark plug 8 to light a fire combustion morning of mixed gas in front-bank rotor housing 3, cause the super of varying strength
Pinking；
S3, gathered pressure in cylinder body 3 by cylinder pressure sensor 7 and change, extract pressure oscillations
Information, it is judged that the intensity of super detonation in cylinder body 3；
S4, by air inlet temperature control pressure stabilizing cavity 12, air throttle 11 and fuel injector 10 change live
Plug 2 is compressed to during top dead centre the thermodynamic state of mixed gas in cylinder body 3, the different heating power of research
Learn the status consideration impact on super detonation.
As in figure 2 it is shown, concrete, according to said method, simulation early combustion particle as a example by carbon granules,
The flexible of piston has crank angle Y to determine, and then affects the size of cylinder pressure X, then passes through cylinder
The change of pressure sensor detection cylinder pressure X, when carbon granules is heated to 300 DEG C of a2, and does not add
The circulation entering carbon granules (normal temperature a1) is compared, and in cylinder, heat release beginning substantially shifts to an earlier date, cylinder pressure
Compressed lines has just been had been detached near top dead center.This shows, high temperature carbon granules serves focus
Effect, heated gaseous mixture around, is allowed to create spontaneous combustion.And continue to be heated to by carbon granules
During 370 DEG C of a3, relative to 300 DEG C of a2, the moment of cylinder pressure-off tripping diminishing line, the initial stage was fiery earlier
Flame propagates the heat liberation rate, heat release rate brought faster.This temperature that also result in unburned mixture and pressure enter
One step raises, after some time it is possible to reach the critical state of spontaneous combustion.There occurs after certain delay period
Large-area unburned mixture spontaneous combustion, causes heat release rapidly and pressure wave acutely vibrates, and occurs
Super detonation.When carbon granules is heated to 450 DEG C of a4, after there is early combustion in before upper dead canter, band
Having carried out the most quickly flame and propagated heat release, it is super quick-fried that end gaseous mixture spontaneous combustion thereafter causes
Shake maximum intensity.
Fig. 3 gives when carbon granules temperature is all heated to 370 DEG C of a3, and the carbon granules of different-grain diameter is made
The super detonation circulation become.Equally, each super detonation or early combustion circulation for add carbon granules it
The circulation that rear super detonation is the strongest.
The particle diameter of carbon granules is the biggest, the most easily induces super detonation.Add 300 mesh b4 (about
Carbon granules 0.050mm), the burning to electromotor has little to no effect.And add 200 mesh b3
(0.075mm) after the carbon granules of above particle diameter, it becomes possible to induction super detonation.Especially 50
The carbon granules of mesh b1 (about 0.300mm) can induce the strongest super detonation.And,
Carbon granules particle diameter is the biggest, and the most early, super detonation intensity is the biggest in early combustion.This is because, particle diameter is little
Carbon granules, specific surface area is big, and heat radiation faster, is cooled down rapidly by gas in the jar after the addition.And,
Owing to its particle diameter is less, it is possible to the temperature promoting gaseous mixture around is relatively low, it is impossible to make around to mix
Gas reaches autoignition temperature in compression travel, fails to early fire.
It follows that by different temperatures and the carbon granules of different-grain diameter, acquisition that can be stable is different
The super detonation of intensity, then on the basis of this, change the thermodynamic state in cylinder body, the most deployable pass
In the different thermodynamic state researchs on the impact of pinking.
In addition, it is to be understood that simulation is early fired particle and is not limited to carbon granules, also may be used
With according to real engine type, to other particles, if metallic element or soot etc. are to super quick-fried
The impact of shake launches research.
The above is only the preferred embodiment of the present invention, it is noted that lead for this technology
For the those of ordinary skill in territory, on the premise of without departing from the technology of the present invention principle, it is also possible to
Making some improvement and replacement, these improve and replace and also should be regarded as protection scope of the present invention.
Claims (8)
1. a supercharging gasoline engine super detonation assay device, it is characterised in that include cylinder body
(3), cylinder cap (6), piston (2), inlet valve (9), exhaust valve (5) and spark plug
(8), described piston (2) and spark plug (8) are arranged in cylinder body (3), described air inlet
Door (9) and exhaust valve (5) are arranged on cylinder cap (6)；
Described inlet valve (9) is the most corresponding with exhaust valve (5) to be connected by air intake duct and exhaust duct
It is connected to air inlet pipeline and gas exhaust piping；The airintake direction of described air inlet pipeline is sequentially provided with into
Gas control temperature pressure stabilizing cavity (12), air throttle (11) and microgranule charging point (14)；Fuel injector (10)
Being arranged at the road junction of described air intake duct, described microgranule charging point (14) is used for filling simulation early
Combustion particle, described microgranule charging point (14) is provided with temperature control heating system, is used for heating described mould
Intend early combustion particle；The inside of described cylinder body (3) is provided with cylinder pressure sensor (7)；
Described cylinder pressure sensor (7) connects computer, for examining described cylinder pressure sensor
The data measured process；
Described gas exhaust piping is provided with exhaust analyzer (4).
Supercharging gasoline engine super detonation assay device the most according to claim 1, it is special
Levying and be, described temperature control heating system is resistance heater.
Supercharging gasoline engine super detonation assay device the most according to claim 1, it is special
Levying and be, the compression ratio of described piston (2) is 14-18.
Supercharging gasoline engine super detonation assay device the most according to claim 1, it is special
Levy and be, be provided with microgranule between described microgranule charging point (14) and air inlet pipeline and import valve (13).
Supercharging gasoline engine super detonation assay device the most according to claim 1, it is special
Levying and be, described piston (2) is steel piston.
Supercharging gasoline engine super detonation assay device the most according to claim 1, it is special
Levying and be, described piston (2) is driven operating by dynamometer machine (1).
7. the method for testing of a super detonation, it is characterised in that by claim 1-6
Supercharging gasoline engine super detonation assay device described in any one realizes, and specifically includes following step
Rapid:
S1, by air inlet temperature control pressure stabilizing cavity (12), air throttle (11) and fuel injector (10)
Control piston (2) and be compressed to the thermodynamic state of cylinder body (3) interior gaseous mixture during top dead centre；
S2, in cylinder body (3), filled the simulation of different temperatures by microgranule charging point (14)
Early combustion particle, or in cylinder body (3), fill different-grain diameter by microgranule charging point (14)
Simulation early combustion particle, it is achieved combustion morning of spark plug (8) igniting front-bank rotor housing (3) interior mixed gas,
Cause the super detonation of varying strength；
S3, gathered the pressure in cylinder body (3) by cylinder pressure sensor (7) and change, extract pressure
Power concussion information, it is judged that the intensity of cylinder body (3) interior super detonation；
S4, by air inlet temperature control pressure stabilizing cavity (12), air throttle (11) and fuel injector (10)
Change piston (2) and be compressed to the thermodynamic state of cylinder body (3) interior mixed gas during top dead centre,
The different thermodynamic state factor impact on super detonation of research.
The method of testing of super detonation the most according to claim 7, it is characterised in that
Described simulation early combustion particle is element carbon granules, engine soot generation or metallic element.
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| CN105527106B (en) * | 2015-12-15 | 2019-07-12 | 清华大学 | The experimental rig and test method that super detonation is influenced for evaluating machine oil |
| CN106168540B (en) * | 2016-08-09 | 2018-08-17 | 天津大学 | Can flexible modulation flowing-pressure wave-burning interaction visualization combustion chamber |
| CN108256262B (en) * | 2018-02-07 | 2021-03-26 | 武汉科技大学 | Numerical simulation method for parameter design of axisymmetric jet flow pressure stabilizing cavity |
| CN111521404B (en) * | 2020-06-08 | 2022-03-08 | 南京理工大学 | Device and method for researching formation and inhibition of in-cylinder detonation under detonation of internal combustion engine |
| CN112113768B (en) * | 2020-09-09 | 2021-08-31 | 安徽江淮汽车集团股份有限公司 | Engine super-knock difference verification method |
| CN113899545A (en) * | 2021-10-09 | 2022-01-07 | 联合汽车电子（重庆）有限公司 | Electronic throttle valve comprehensive test system and test method |
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| US5633798A (en) * | 1995-04-13 | 1997-05-27 | Phillips Petroleum Company | Method and apparatus for measuring octane number |
| DE19615448A1 (en) * | 1996-04-19 | 1997-11-20 | Bosch Gmbh Robert | Knock detection and control device for an internal combustion engine |
| JP3281624B2 (en) * | 2000-02-25 | 2002-05-13 | ダイハツ工業株式会社 | Knock detection method for internal combustion engine using ion current |
| JP4560241B2 (en) * | 2001-06-06 | 2010-10-13 | 富士通テン株式会社 | Internal combustion engine knock determination device |
| JP2004239696A (en) * | 2003-02-05 | 2004-08-26 | Daifuku Co Ltd | Method and apparatus for inspecting knocking detector |
| JP4052230B2 (en) * | 2003-11-12 | 2008-02-27 | トヨタ自動車株式会社 | Internal combustion engine knock determination device |
| CN201293699Y (en) * | 2008-10-22 | 2009-08-19 | 比亚迪股份有限公司 | Detonation pressure tester |
| CN204064550U (en) * | 2014-07-15 | 2014-12-31 | 清华大学 | Supercharging gasoline engine super detonation test unit |
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