CN106593701A - Cylinder internal water spraying detection control system for gasoline engine and application of cylinder internal water spraying detection control system - Google Patents
Cylinder internal water spraying detection control system for gasoline engine and application of cylinder internal water spraying detection control system Download PDFInfo
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- CN106593701A CN106593701A CN201611127525.7A CN201611127525A CN106593701A CN 106593701 A CN106593701 A CN 106593701A CN 201611127525 A CN201611127525 A CN 201611127525A CN 106593701 A CN106593701 A CN 106593701A
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- voltage
- gasoline engine
- water spraying
- cylinder
- microprocessor
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/022—Adding fuel and water emulsion, water or steam
- F02M25/025—Adding water
- F02M25/03—Adding water into the cylinder or the pre-combustion chamber
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B47/00—Methods of operating engines involving adding non-fuel substances or anti-knock agents to combustion air, fuel, or fuel-air mixtures of engines
- F02B47/02—Methods of operating engines involving adding non-fuel substances or anti-knock agents to combustion air, fuel, or fuel-air mixtures of engines the substances being water or steam
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P5/00—Advancing or retarding ignition; Control therefor
- F02P5/04—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions
- F02P5/145—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions using electrical means
- F02P5/15—Digital data processing
- F02P5/1502—Digital data processing using one central computing unit
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Signal Processing (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention relates to a cylinder internal water spraying detection control system for a gasoline engine and application of the cylinder internal water spraying detection control system. The cylinder internal water spraying detection control system comprises a gasoline engine cylinder body, a high-voltage silicon rectifier stack, a voltage component, adaptive resistors, a signal processing device and a microprocessor, wherein a sparking plug and a water spraying nozzle are arranged in the gasoline engine cylinder body; the sparking plug is connected with an ignition device; the voltage component applies voltage to form a directional electrical field between the sparking plug and the gasoline engine cylinder body; an ion product generated by combustion in the gasoline engine cylinder body directionally moves to form ion current; the ion current serves as a voltage signal in the adaptive resistors; the voltage signal is fed to the microprocessor through the signal processing device; and the microprocessor makes decision and controls the water spraying nozzle to carry out voltage action. Compared with the prior art, the cylinder internal water spraying detection control system disclosed by the invention has the advantages that real-time online detection and feedback control of the water spraying process are realized by using an amplitude of an ion current signal, so that a water spraying technology is effectively controlled in time, a water spraying control signal and a water spraying action are synchronously carried out, the combustion process is optimized, and the sensitivity, the timeliness and the accuracy in control are realized.
Description
Technical field
The invention belongs to technical field of internal combustion engines, and in particular to a kind of gasoline engine in-cylinder water injection detecting and controlling system and its should
With.
Background technology
International and domestic energy-saving and emission-reduction are increasingly strict, and small displacement supercharging gasoline engine obtains wideling popularize and application, effectively reduce
Field of traffic fuel consumption and pollutant emission, but with the increase of in-cylinder combustion intensity, pinking, super detonation etc. it is non-
Normal combustion phenomenon proposes requirements at the higher level to petrol engine combustion stability and durability.For effective control high pressure-charging, high load capacity
Abnormal combustion phenomenon, in-cylinder water injection technology is brought gradually to obtain the attention of domestic and international research institution and car load factory.In-cylinder water injection
Technology is sprayed water before petrol engine combustion, can effectively reduce cylinder temperature, suppresses Abnormal combustion, is realized not by water-jet technology
Postpone time of ignition, do not adopt the combustion strategies of enriching equivalent proportion, effectively improve the gasoline engine thermal efficiency, reduce fuel consumption.
It will be appreciated, however, that water spray process needs to accomplish precise control, to avoid shadow of the water smoke to combustion flame propagation
Ring, and water is different from gasoline, its lubrication to nozzle is poor, is susceptible to Nozzle failures, is easily caused water spray control letter
Number asynchronous with water spray action executing, water-jet technology effectively, cannot be controlled timely, and combustion process can not being optimal.
The content of the invention
The purpose of the present invention is exactly that a kind of gasoline engine in-cylinder water injection detecting and controlling system is provided to solve the above problems
And its application.
The purpose of the present invention is achieved through the following technical solutions：
A kind of gasoline engine in-cylinder water injection detecting and controlling system, including cylinder of petrol engine, are provided with described Engine body
Spark plug and spray nozzle, described spark plug connection igniter, also including high voltage silicon rectifier stack, voltage device, self adaptation resistance,
Signal processing apparatus and microprocessor, described spark plug is connected successively with high voltage silicon rectifier stack, voltage device, self adaptation resistance, institute
The spray nozzle stated is connected successively with microprocessor, signal processing apparatus, self adaptation resistance, during work, described voltage device
Applied voltage, forms orientation electric field between spark plug and cylinder of petrol engine, under orientation electric field action, cylinder of petrol engine internal combustion
Burn the ion product displacement for producing and form gas current, ion-conductance flows through self adaptation resistance and produces voltage signal, then passes through
Signal processing apparatus deliver to microprocessor, and microprocessor processes simultaneously make a policy, and control spray nozzle carries out action.
The concrete rate-determining steps of described microprocessor are：
A () gathers ion current signal, be calculated gas current extreme value ImaxAnd gas current extreme value phase thetaImax；
B () is by ImaxWith setting value ISettingRelatively, if ImaxLess than ISettingAnd difference exceedes given threshold, then judge spray nozzle
(2) break down, if difference is less than given threshold, into step (c), described given threshold is 4-8 μ A, with engine load
Size changes；
C () is by θImaxWith setting value θI setsRelatively, if θImaxLess than θI sets, then the water spray moment of subsequent cycle is postponed, if
θImaxMore than θI sets, then the water spray moment of subsequent cycle is shifted to an earlier date.
θ in step (c)I setsThe gas current inscribed when being the optimal water spray determined by the work of early stage engine calibration
Maximum crank angle, the value changes with engine operating condition scope and changes, after staking-out work is completed, complete realize to engine
Operating mode most preferably spray water the moment MAP prepare；In engine working process, using the θ for detectingImaxBe stored in microprocessor
θ in deviceI setsMAP contrast, if θImaxLess than θI sets, then the water spray moment of subsequent cycle is postponed into θI sets-θImaxDifference
Angle；If θImaxMore than θI sets, then the water spray moment of subsequent cycle is shifted to an earlier date into θImax-θI setsThe angle of difference；If θImaxIt is equal to
θI sets, then it is not required to adjust the water spray moment of subsequent cycle.
Described voltage device includes increasing apparatus and battery, and increasing apparatus are in parallel with battery.
Further, the voltage of described battery is 12V or 48V, after boosted device boosting, described voltage device
The voltage of output is 60-90V.
Further, in circuit, the self adaptation resistance is little using resistance variations precision for described self adaptation resistant series
In 0.1% precision resister, realize that the self adaptation of 100k Ω to 1M Ω is adjusted under different operating modes by the regulation of microprocessor
Section, plays a part of to amplify voltage signal.
Further, described signal processing apparatus include believing μ A level signals into 0-10V simulations by conversion process
Number high-gain amplifier and by signal smooth out bandpass filter.
Further, more than 2000V, the pressure drop that its forward direction passes through is less than the voltage of described high voltage silicon rectifier stack isolation
0.3V, main purpose is to prevent the high-voltage ignition signal of ignition process into gas current acquisition system so as to cause system to be damaged
It is bad.
The operation principle of the present invention：Gasoline engine can generate a large amount of bands in combustion process because of chemi-ionization and thermal ionization
The ion product of electricity.The ionization that chemi-ionization is mainly produced by fuel combustion chemical action, these ions are generally in more unstable
Determine state, different ions can accordingly change with the carrying out of combustion reaction, the gas current in the stage mainly receives chemistry of fuel
Matter and the impact in chemical reaction path, its main chemical reactions formula is as follows：
CH+O→CHO++e- CHO++H2O→H3O++CO
Different from chemi-ionization, thermal ionization occurs mainly in late combustion, and now cylinder temperature is very high, and warm-up movement causes cylinder
The formation of interior ion, the ion that the stage is formed is mainly such as NO and PM in interior bulky grain charge species, its primary chemical
Reaction is as follows：
M is primarily referred to as NO and PM, E in formulaionFor hot radical group.
It is burned by gasoline engine cylinder on-load voltage, forming orientation electric field between spark plug and cylinder of petrol engine
The above-mentioned ion of Cheng Shengcheng in directed movement under extra electric field and will form gas current, by ion current signal amplitude come
The working condition of real-time detection in-cylinder water injection nozzle, realizes the inline diagnosis of in-cylinder water injection nozzle.The change meeting of water content in cylinder
To H3O+Hydrated ion concentration is produced to be affected and reacts in ion current signal, and ion current signal possesses and reflect simultaneously in cylinder
Water spray and the ability of combustion process, based on detection and analysis to gas current, are possible to obtain water spray and fired state information,
Realize the inline diagnosis to process of spraying water with water spray and combustion process optimization.
Ion current signal relevant feature parameters mainly have gas current extreme value ImaxWith gas current extreme value phase thetaImax,
Water vapour content changes in cylinder under difference circulation injection flow rate, affects ImaxAnd θImaxParameter, can be by ImaxAnd θImax
The feedback control of water spray and combustion process is realized in the extraction of parameter with analysis, specifically, after cylinder combustion, water spray, to ion-conductance
Stream signal is acquired and is delivered to microprocessor；After A/D conversions, the ion current signal to collecting enters microprocessor
Row Digital Signal Processing, is calculated gas current extreme value ImaxAnd its phase place extreme value θImax, by ImaxWith setting value ISettingRelatively,
If ImaxLess than ISettingAnd difference exceedes given threshold (4-8 μ A), then alarm in-cylinder water injection nozzle possible breakdown, if difference is little
In given threshold, then gas current extreme value phase theta is determined whetherImax, it is prior by staking-out work with microprocessor
The optimal θ for obtainingI setsMAP is contrasted, if θImaxLess than θI sets, then the water spray moment of subsequent cycle is postponed into θI sets-θImaxDifference
Angle, if θImaxMore than θI sets, then the water spray moment of subsequent cycle is shifted to an earlier date into θImax-θI setsThe angle of difference, so that it is guaranteed that spray
The optimization of water and combustion process.
The present invention realizes the real-time online detection to process of spraying water and feedback control by the amplitude to ion current signal,
Water-jet technology is set to obtain effectively, timely controlling, water spray control signal is synchronous with water spray action executing, combustion process is reached most
Optimization, it is sensitive, timely, accurate to control.
Description of the drawings
Fig. 1 is the structural representation of the present invention；
Fig. 2 is in-cylinder pressure, ion current signal and water spray signal schematic representation；
Fig. 3 is the ion current signal comparison diagram of water spray operating mode and operating mode of not spraying water；
Fig. 4 is gas current characteristic parameter definition figure；
Fig. 5 is the water spray process detection control process schematic diagram of the present invention；
In figure：1- cylinder of petrol engine；2- spray nozzles；3- spark plugs；4- igniters；5- high voltage silicon rectifier stacks；6- rises and press-fits
Put；7- batteries；8- self adaptation resistance；9- signal processing apparatus；10- microprocessors.
Specific embodiment
Below in conjunction with the accompanying drawings the present invention is described in detail with specific embodiment.
Embodiment 1
A kind of gasoline engine in-cylinder water injection detecting and controlling system, reference Fig. 1, including set in Engine 1, cylinder of petrol engine 1
There are spark plug 3 and spray nozzle 2, the connection igniter 4 of spark plug 3, also including high voltage silicon rectifier stack 5, increasing apparatus 6 and battery 7
The voltage device of composition, self adaptation resistance 8, signal processing apparatus 9 and microprocessor 10, both positive and negative polarity and the direct current liter of battery 7
The both positive and negative polarity correspondence of pressure device 6 is connected, and DC boosting device is adjustable to 60V by battery 12V voltage increases, the voltage after rising
Self adaptation resistance 8 is connected to through high_voltage isolation silicon stack 5, spark plug 3 and cylinder of petrol engine 1, ion current signal is in self adaptation
Being presented as after voltage signal to transmit to signal processing apparatus 9 in resistance 8 carries out such as signal condition and amplifies computing, then will letter
Number microprocessor 10 is transferred to, 10 pairs of voltage signals of microprocessor are processed and made decisions, output signal control spray nozzle 2
Carry out action.
Fig. 2 is the comparison diagram using the gasoline engine in-cylinder pressure of in-cylinder water injection technology, gas current and water spray signal, the figure
It is the circulating fuel injection quantity 46.7mg in petrol engine rotational speed 1500r/min, 30 °C of A of ignition timing before upper dead canter, timing top dead centre of spraying water
Obtain under the operating mode of 10 ° of A afterwards, can see from result of the test, the gas current after water spray is significantly increased before relatively spraying water, can
, come the working condition of real-time diagnosis in-cylinder water injection nozzle, the online of in-cylinder water injection nozzle is realized with by ion current signal amplitude
Diagnosis (OBD).In figure, water spray is marked and the in-cylinder pressure of circulation of not spraying water, gas current and water spray signal, water spray signal can use
In water spray and circulation of not spraying water is distinguished, shown in figure, spray water minimum with the lower in-cylinder pressure difference of circulation of not spraying water, and gas current
Signal difference is very big, confirms and realizes the feasibility that in-cylinder water injection process is detected using gas current.
Fig. 3 is right with operating mode of not spraying water in water spray with gas current using the gasoline engine in-cylinder pressure of in-cylinder water injection technology
It is the circulating fuel injection quantity 46.7mg in petrol engine rotational speed 1500r/min than figure, the same Fig. 2 of the figure, 30 ° of ignition timing before upper dead canter
CA, obtains under the operating mode of the timing 10 °C of A of after top dead center that spray water.As can be seen from the test results, ion in cylinder under operating mode of spraying water
There is significant difference in electric current, ion current signal rate of change is significantly improved, and peak phase increases and improves with operating mode of not spraying water.
H3O+ ion concentrations can be produced because the water vapor concentration that spray water belt comes increases and increases as the leading ion of ion current signal
Thing, H3The increase of O+ ions causes the gas current under water spray operating mode to be improved.In figure, water spray is marked with circulation of not spraying water
In-cylinder pressure and ion current signal mean value, have proved realized the feasible of in-cylinder water injection process detection using gas current again
Property.
Fig. 4 shows the relevant feature parameters of ion current signal, mainly there is gas current extreme value ImaxWith gas current pole
Value phase thetaImax, water vapour content changes in the cylinder under difference circulation injection flow rate, affects ImaxAnd θImaxParameter, can pass through
To ImaxAnd θImaxThe feedback control of water spray and combustion process is realized in the extraction of parameter with analysis.
The system is used in the gasoline engine combustion process using in-cylinder water injection technology, Fig. 5 is that the detection of water spray process was controlled
Journey schematic diagram, ion current signal relevant feature parameters mainly have gas current extreme value ImaxWith gas current extreme value phase thetaImax,
Water vapour content changes in cylinder under difference circulation injection flow rate, affects ImaxAnd θImaxParameter, can be by ImaxAnd θImax
The feedback control of water spray and combustion process is realized in the extraction of parameter with analysis, specifically, after cylinder combustion, water spray, to ion-conductance
Stream signal is acquired and is delivered to microprocessor；After A/D conversions, the ion current signal to collecting enters microprocessor
Row Digital Signal Processing, is calculated gas current extreme value ImaxAnd its phase place extreme value θImax, by ImaxIt is setting value with strategy value
ISettingRelatively, if ImaxLess than ISettingAnd difference exceedes given threshold (4-8 μ A), then alarm in-cylinder water injection nozzle possible breakdown,
If difference is less than given threshold, gas current extreme value phase theta is determined whetherImax, by it with microprocessor in pass through in advance
The strategy value that staking-out work is obtained is optimal θI setsMAP is contrasted, if θImaxLess than θI sets, then by the water spray moment of subsequent cycle
Postpone θI sets-θImaxThe angle of difference, if θImaxMore than θI sets, then the water spray moment of subsequent cycle is shifted to an earlier date into θImax-θI setsDifference
Angle, so that it is guaranteed that water spray and the optimization of combustion process.
The above-mentioned description to embodiment is understood that for ease of those skilled in the art and using this
It is bright.Person skilled in the art obviously easily can make various modifications to the embodiment, and described herein one
As principle be applied in other embodiment without through performing creative labour.Therefore, the invention is not restricted to embodiment here,
Those skilled in the art's announcement of the invention, the improvement made without departing from scope and modification all should be at these
Within bright protection domain.
Claims (8)
1. a kind of gasoline engine in-cylinder water injection detecting and controlling system, including cylinder of petrol engine (1), in described cylinder of petrol engine (1)
It is provided with spark plug (3) and spray nozzle (2), described spark plug (3) connection igniter (4), it is characterised in that also including height
Pressure silicon stack (5), voltage device, self adaptation resistance (8), signal processing apparatus (9) and microprocessor (10), described spark plug
(3) be connected with high voltage silicon rectifier stack (5), voltage device, self adaptation resistance (8) successively, described spray nozzle (2) successively with microprocessor
Device (10), signal processing apparatus (9), self adaptation resistance (8) connection,
During work, described voltage device applied voltage forms orientation electric field between spark plug (3) and cylinder of petrol engine (1),
Under orientation electric field action, the ion product displacement that burning is produced in cylinder of petrol engine (1) forms gas current, ion-conductance
Flow through self adaptation resistance (8) and produce voltage signal, then microprocessor (10), microprocessor are delivered to through signal processing apparatus (9)
(10) process and make a policy, control spray nozzle (2) carries out action.
2. a kind of gasoline engine in-cylinder water injection detecting and controlling system according to claim 1, it is characterised in that described micro- place
Specifically rate-determining steps are reason device (10)：
A () gathers ion current signal, be calculated gas current extreme value ImaxAnd gas current extreme value phase thetaImax；
B () is by ImaxWith setting value ISettingRelatively, if ImaxLess than ISettingAnd difference exceedes given threshold, then judge spray nozzle (2)
Break down, if difference is less than given threshold, into step (c), described given threshold is 4-8 μ A；
C () is by θImaxWith setting value θI setsRelatively, if θImaxLess than θI sets, then the water spray moment of subsequent cycle is postponed, if θImax
More than θI sets, then the water spray moment of subsequent cycle is shifted to an earlier date.
3. a kind of gasoline engine in-cylinder water injection detecting and controlling system according to claim 1, it is characterised in that described voltage
Component includes increasing apparatus (6) and battery (7), and increasing apparatus (6) are in parallel with battery (7).
4. a kind of gasoline engine in-cylinder water injection detecting and controlling system according to claim 3, it is characterised in that described electric power storage
The voltage in pond (7) is 12V or 48V, and after boosted device boosting, the voltage of described voltage device output is 60-90V.
5. a kind of gasoline engine in-cylinder water injection detecting and controlling system according to claim 1, it is characterised in that described is adaptive
Precision resister of the resistance (8) using resistance variations precision less than 0.1% is answered, by the regulation of microprocessor under different operating modes
Realize the Automatic adjusument of 100k Ω to 1M Ω.
6. a kind of gasoline engine in-cylinder water injection detecting and controlling system according to claim 1, it is characterised in that described signal
Processing meanss (9) include for μ A level signals passing through conversion process into the high-gain amplifier of 0-10V analog signals and will believe
Number smooth-going bandpass filter.
7. a kind of gasoline engine in-cylinder water injection detecting and controlling system according to claim 1, it is characterised in that described high pressure
The voltage of silicon stack (5) isolation is less than 0.3V more than 2000V, the pressure drop that its forward direction passes through.
8. a kind of application of gasoline engine in-cylinder water injection detecting and controlling system as claimed in claim 1, it is characterised in that examine this
Survey the On-line Control that control system is applied to gasoline engine in-cylinder water injection.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611127525.7A CN106593701B (en) | 2016-12-09 | 2016-12-09 | A kind of gasoline engine in-cylinder water injection detecting and controlling system and its application |
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| CN201611127525.7A CN106593701B (en) | 2016-12-09 | 2016-12-09 | A kind of gasoline engine in-cylinder water injection detecting and controlling system and its application |
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| CN106593701A true CN106593701A (en) | 2017-04-26 |
| CN106593701B CN106593701B (en) | 2019-06-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108060992A (en) * | 2017-09-11 | 2018-05-22 | 同济大学 | A kind of system and control method using in-cylinder water injection control internal combustion engine homogeneity compression-ignition |
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