CN102322337B - Tempering prevention and abnormal combustion restraining method of hydrogen fuel combustion engine - Google Patents
Tempering prevention and abnormal combustion restraining method of hydrogen fuel combustion engine Download PDFInfo
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Abstract
The invention relates to a tempering prevention and abnormal combustion restraining method of a hydrogen fuel combustion engine, a prevention method uses at least two ways of hydrogen spraying devices to spray hydrogen, and the hydrogen spraying devices adopt a sectional operating mode to spray hydrogen; when the hydrogen spraying devices spray hydrogen at the early stage, an intake valve is opened to delay some time to spray n; and the terminal time of the hydrogen spraying is fixed on the moment of starting closing the intake valve. The tempering prevention method decay time spraying hydrogen of the hydrogen fuel combustion engine provided by the invention has the advantages of avoiding hydrogen spraying from happening in a valve overlap at the air inflow starting moment, reducing the residence time of the hydrogen in an intake tube as far as possible, and reducing the litten probability of a gas mixture and reducing the probability of the tempering through an air inflow cooling inlet manifold internal hot point; fixing the hydrogen spraying manner of each way of most length hydrogen spraying extended period no matter what load size, and ensuring not to close to the overlap part at the open front end of the inlet valve at the starting moment of each way of hydrogen spraying; and effectively preventing the tempering, combining the adjusting ignition, and effectively restraining abnormal combustion.
Description
Technical field
The present invention relates to a kind of tempering prevention and abnormal combustion inhibition method of hydrogen-fueled internal combustion engine, belong to hydrogen internal combustion engine control technique field.
Background technique
Hydrogen fuel is considered to the leading fuel of the Shape Of Things To Come motor of tool prospect with it in the unique advantage aspect the energy and the environmental protection two and the superperformance that is used for vehicle, and developed country pays much attention to.Because hydrogen fuel and oil-fired physicochemical characteristic have obvious difference, take air inlet tubular type pressure hydrogen ejecting system to organize the mixed gas of hydrogen engine to form and burning, be prone to pre-ignition, tempering.Pre-ignition refer to the hydrogen air Mixture before igniting by cylinder in incandescent spot light and the phenomenon that takes fire, pre-ignition makes burning out of control, and the heat transfer loss is increased and engine overheat, make easily suction valve/door place temperature rising and overheated, thereby cause the suction tude tempering, so pre-ignition easily causes tempering.So-called suction tude tempering, refer in intake process, when intake valve is not yet closed, the hydrogen air Mixture of flame propagation in suction tude and the suction tude of igniting in the cylinder, or the interior hydrogen air Mixture of suction tude is by in the cylinder or intake valve focus a kind of malcombustion phenomenon of lighting.Tempering generally is accompanied by pre-ignition and occurs, and usually occurs in than the rich mixture operating mode, is easier to during high speed occur.When hydrogen engine generation tempering, normal working procedure is destroyed, and power descends, and the Economy variation makes engine misses when serious.Therefore must suppress the tempering of hydrogen engine.
Be different from the malcombustion of traditional petroleum fuel motor, pre-ignition, detonation such as petrol engine, or the rough running of diesel engine, the hydrogen flame velocity of propagation be exceedingly fast and the characteristics of fire extend broadness so that pre-ignition appears in hydrogen engine easily, and change mutually with tempering, so that the hydrogen engine abnormal combustion has more moment is sudden, also more complicated.Also directly have influence on power character, Economy and the noxious gas emission of hydrogen engine.Have, compare with petroleum fuel, on the one hand because the density of hydrogen is very little, it is more to cause power to descend, although the equivalent proportion increase can be so that the hydrogen engine increased power, this trend that will cause the abnormal combustions such as tempering, pre-ignition occur increases.Though in-cylinder injection can be eliminated tempering, in high-pressure air, hydrogen density is little so that spray beam journey is short, and mixed gas forms and burning organizes difficulty to increase, and increases that spray beam journey also has lubrication problem that gas sprays so that high pressure spray hydrogen system design difficulty very.Hydrogen-fuel engine will solve between the various performances, as improving power, improve combustion efficiency and reducing NO
xContradiction beyond, also must coordinate solve the contradiction between abnormal combustion and the above-mentioned performance.
Summary of the invention
The purpose of this invention is to provide a kind of hydrogen-fueled internal combustion engine tempering prevention and abnormal combustion inhibition method, solving effective prevention and to suppress the abnormal combustion problems such as pre-ignition, tempering of hydrogen-fuel engine, and take into account power character and the Economy of optimizing motor.
For achieving the above object, hydrogen-fueled internal combustion engine tempering prevention method of the present invention is used at least two-way spray hydrogen device spray hydrogen, and the method may further comprise the steps:
(1) spray hydrogen device adopts the working method spray hydrogen of parallel fragmentation;
(2) being engraved in INO during spray hydrogen device early start spray hydrogen delays time later on and sprays hydrogen after the set time;
(3) be fixed on suction valve the finish time of spray hydrogen and begin close moment.
Further, spray hydrogen device adopts the working method spray hydrogen of parallel fragmentation to refer to select to enable a few road spray hydrogen devices according to the reality spray hydrogen duration in the described step (1), and the parallel spray hydrogen task of finishing of each road spray hydrogen device of enabling.
Further, the spray hydrogen of each road spray hydrogen device is fixed the finish time in the described step (3), the spray hydrogen of spray hydrogen device is also identical the zero hour, and the hydrogen spraying valve that sprays the hydrogen devices except all the other each roads of one tunnel spray hydrogen device is fixed on maximum spout hydrogen pulsewidth place, and constantly begins to spray hydrogen at early start spray hydrogen; Remaining spray hydrogen pulsewidth is finished by described one tunnel spray hydrogen device.
Further, be fixed on suction valve and begin close moment and leave a small amount of surplus the finish time of spraying hydrogen in the described step (3), can all enter cylinder so that spray into suction tude hydrogen, in the suction tude noresidue.
Hydrogen-fueled internal combustion engine abnormal combustion inhibition method of the present invention is used at least two-way spray hydrogen device spray hydrogen, and the method may further comprise the steps:
(1) in a single day system detects the generation of pre-ignition, and pre-ignition intensity just uses at least parallel spray of two-way spray hydrogen device hydrogen during less than the pre-ignition threshold value simultaneously, and wherein every road spray hydrogen device is born the spray hydrogen pulsewidth of equivalent;
(2) when detecting pre-ignition intensity greater than the pre-ignition threshold value, then take at least parallel spray of two-way spray hydrogen device hydrogen, and postpone ignition timing, take into account simultaneously engine performance;
(3) when detecting the generation tempering, and tempering intensity less than the tempering threshold value after, take at least parallel spray of two-way spray hydrogen device hydrogen, and directly significantly postpone fast ignition timing, no longer take into account engine performance;
(4) when occur tempering surpass slight scope namely greater than the tempering threshold value after, take measures according to the operating mode of tempering degree and generation: if tempering occurs under the large load, take to reduce load and suppress fast tempering; If tempering occurs under the idling operation, strengthen load and suppress tempering.
Further, postpone igniting according to pre-ignition degree appropriateness in the described step (2), refer to postponement igniting with suppress the pre-ignition degree, take into account engine performance and be associated, time of ignition still is in and makes engine power performance and Economy at a mild reduction section corresponding time of ignition.
Further, the reduction amount of load depends on tempering intensity in the described step (4).
Further, described step (4) if in tempering behind load reduction, be inhibited, then progressively recover load after the motor steady running until do not reduce; If after reducing load, the tempering strength decreased is not obvious, continues to reduce engine load and reduce spray hydrogen pulsewidth, until tempering phenomenon is eliminated.
Further, the mode that the reduction of load and increasing take segmentation to reduce or strengthen in the described step (4).
Further, described segmentation is to deduct 10% load percentage according to the there and then corresponding percentage of loading, and minutes two sections or three sections evenly successively decrease, or successively decrease with the 20%-25% Rate of load condensate; Increase progressively according to 20% Rate of load condensate during idling.
Multichannel spray hydrogen system is used in hydrogen-fueled internal combustion engine tempering of the present invention prevention, adopts the parallel spray of multichannel spray hydrogen system hydrogen, suction tude time-delay spray hydrogen, fixing spray hydrogen finish time and postpones the mode of lighting a fire and combining, and prevents the generation of abnormal combustion.Wherein time-delay spray hydrogen is not only avoided spraying hydrogen in air inlet initial time valve overlap, and reduce hydrogen at the air inlet intraductal retention time as far as possible, can also be by the inner focus of air inlet cooling in early stage intake manifold, the probability that the probability that the reduction mixed gas is lighted occurs to reduce tempering; Time-delay spray hydrogen depends on the earliest spray hydrogen initial time of permission, sprays the earliest the hydrogen initial time more early, and the tempering possibility is larger; But it is more late to spray the earliest the hydrogen initial time, and the spray hydrogen endurance is shorter, thus, will increase spray hydrogen system number and eject request; The spray hydrogen mode of fixing the longest spray hydrogen duration of every road is payload no matter, and every road spray hydrogen initial time all can be near the folded angle of release part of advancing valve and opening front end; Effectively prevented the generation of abnormal combustion.
Hydrogen-fueled internal combustion engine abnormal combustion inhibition method of the present invention is used multichannel spray hydrogen system, according to the intensity of abnormal combustion and take into account Economy and the power character of motor, take respectively different measures to suppress abnormal combustion, abnormal combustion not only can be effectively controlled like this, and Economy and the power character of motor can be taken into account to greatest extent.
Description of drawings
Fig. 1 is time-delay spray hydrogen strategy;
Fig. 2 is two hydrogen spraying valve working principles of embodiment;
Fig. 3 is three hydrogen spraying valve working principles of embodiment;
Fig. 4 is many hydrogen spraying valve spray hydrogen pulsewidth allocation flow figure;
Fig. 5 is that many hydrogen spraying valves spray schematic representation simultaneously;
Fig. 6 is the graph of a relation of pre-ignition inhibition degree and ignition advance angle;
Fig. 7 is pre-ignition, backfire control subroutine.
Embodiment
Hydrogen engine generation tempering and hydrogen injection timing and endurance, ignition timing are in close relations generally speaking.If run near the focus of valve when hydrogen injection enters intake manifold, waste gas imports intake manifold into when perhaps running into valve overlap, may cause that all mixed gas in the suction tude internal combustion, causes tempering phenomenon.For this situation, use multichannel spray hydrogen system, adopt the parallel spray of multichannel spray hydrogen system hydrogen, suction tude time-delay spray hydrogen, fixing spray hydrogen finish time and postpone the mode of lighting a fire and combining, prevent the generation of abnormal combustion.The spray hydrogen system is three the tunnel in the present embodiment, and spray hydrogen system hydrogen is supplied with along separate routes, and each road spray hydrogen system adopts single solenoid valve.The concrete measure of taking is as follows:
1) according to full load spray hydrogen amount, trades off and determine that spray hydrogen branch system number begins to spray hydrogen constantly with the maximum that is difficult for the generation tempering.Spray hydrogen early start constantly be INO later sometime after, for example air inlet 2/3 stroke is as spray hydrogen initial point, this is called time-delay and sprays hydrogen.So not only avoid in air inlet initial time valve overlap, spraying hydrogen, and reduce hydrogen at the air inlet intraductal retention time as far as possible, can also be by the inner focus of air inlet cooling in early stage intake manifold, the probability that the probability that the reduction mixed gas is lighted occurs to reduce tempering.Then before suction valve cuts out that hydrogen injection is complete, this moment, charge air flow can be brought into the hydrogen that most spirts go in the cylinder fast, reduce the amount of hydrogen that remains in the suction tude as far as possible, hindered the formation condition (hydrogen mixed gas is arranged in the suction tude) of tempering.Concrete spray hydrogen situation explanation schematic representation as shown in Figure 1.
2) spray in theory the hydrogen duration and more be conducive to reduce hydrogen the closer to the IC Intake Valve Closes position and rest on time in the suction tude, more favourable to suppressing tempering.Adopt the fixing hydrogen scheme of the finish time of spraying for this reason, namely no matter spray the hydrogen pulsewidth what are, be fixed on suction valve and begin close moment and leave a small amount of surplus the finish time of spray hydrogen, determines to spray the hydrogen initial time according to spray hydrogen pulsewidth.So-called " leaving a small amount of surplus " is in order to guarantee that spraying into suction tude hydrogen can all enter cylinder, and in the suction tude noresidue, be that suction valve begins to cut out front 5 the finish time of for example setting spray hydrogen
oCrank angle.The spray hydrogen mode of fixing the longest spray hydrogen duration of every road is payload no matter, and every road spray hydrogen initial time all can be near the folded angle of release part of advancing valve and opening front end; Effectively prevented the generation of abnormal combustion.If take single channel spray hydrogen system, when load increases, or in the process that increases of rotating speed, will shorten air inlet cumulative time and spray the hydrogen time and relatively increase, spray hydrogen initial time can constantly move forward, and will inevitably near valve overlap, cause tempering hidden danger.
3) the earliest spray hydrogen initial time that for this reason determine to allow sprays the hydrogen initial time more the earliest, and the tempering possibility is larger; But it is more late to spray the earliest the hydrogen initial time, and the spray hydrogen endurance is shorter, thus, will increase spray hydrogen system number and eject request.Therefore, this sprays the hydrogen initial time the earliest takes into account that above situation is compromise to be determined, according to full load spray hydrogen system number (the spray hydrogen system is 3 tunnel in the present embodiment) is determined in the requirement of spray hydrogen amount, and every road spray hydrogen system is circumferentially evenly distributed near the inlet valve seat place and along intake manifold as far as possible.Because spray hydrogen is fixed the finish time, so this sprays the corresponding every road maximum spout hydrogen amount (maximum pulse width) of hydrogen initial time the earliest.Actual spray hydrogen pulsewidth and this maximum pulse width that each operating mode of motor is determined compare, when if reality is sprayed the hydrogen pulsewidth greater than this maximum pulse width, then must adopt two hydrogen spraying valves to work simultaneously and can within the period that design allows, finish spray hydrogen, this moment 1, No. 2 hydrogen spraying valve is worked simultaneously, can take following two kinds of spray hydrogen strategy protocol.Scheme one (multichannel spray hydrogen system is parallel but beginning of injection is not identical): because 1, No. 2 hydrogen spraying valve spray hydrogen is fixed the finish time, and No. 1 hydrogen spraying valve initial time is for spraying the earliest the hydrogen initial time, and No. 2 hydrogen spraying valve initial times are that actual spray hydrogen pulsewidth deducts maximum spout hydrogen pulsewidth and determines; Scheme two (multichannel spray hydrogen system is parallel and beginning of injection is identical): to the actual spray of two-way spray hydrogen system mean allocation hydrogen pulsewidth.Scheme one working principle schematic representation as shown in Figure 2.
When large load stage, the aspirating stroke time further reduces, and required emitted dose (spray hydrogen pulsewidth) further increases, if actual spray hydrogen pulsewidth surpasses after 2 times of the single channel maximum spout hydrogen pulsewidths, at this time needs to enable hydrogen spraying valve No. 3, can take two schemes equally.Scheme one: No. 1 No. 2 hydrogen spraying valves are fixed on maximum spout hydrogen pulsewidth place, and remaining injection pulse width is finished by No. 3 injection valves.Scheme one working principle schematic representation as shown in Figure 3; Scheme two: to the actual spray of three tunnel spray hydrogen system mean allocation hydrogen pulsewidth.
In a word, three tunnel spray hydrogen systems are taked parallel and beginning of injection is identical or not identical working method.When hydrogen engine during in little load operation, No. 1 hydrogen spraying valve work; When middle load operation, 1, No. 2 hydrogen spraying valve is worked simultaneously; When large load operation, 1,2, No. 3 hydrogen spraying valve is worked simultaneously.So, every road spray hydrogen initial time is controlled at maximum the permission in the pulsewidth scope.This spray hydrogen strategy has reduced the probability of hydrogen engine pre-ignition and tempering to a great extent.
Compare with scheme one, the spray hydrogen duration of scheme two is identical, and all less than the longest spray hydrogen duration, therefore is conducive to shorten hydrogen in the suction tude waiting time, thereby is conducive to suppress tempering.But on the one hand, it is limited in the suction tude waiting time to shorten hydrogen, on the other hand, the pulse width variations that will affect relevant spray hydrogen system (for example presents complexity, the spray hydrogen duration is greater than the longest spray hydrogen of single channel during the duration, need of scheme will be finished by another road spray hydrogen system greater than part, and the spray hydrogen system working condition of having worked can not change; And second scheme needs according to payload, and spray hydrogen duration length frequently changes the spray hydrogen pulsewidth of two-way spray hydrogen system), so two schemes respectively have pluses and minuses; Derived scheme as for scheme two, no matter namely load much (actual ejection the duration how long), three tunnel spray hydrogen systems are all worked (mean allocation spray hydrogen duration), although in the time of can making little load the spray hydrogen duration shorten (such as the actual ejection duration less than the longest spray hydrogen duration of every road, scheme one or scheme two all only have one tunnel spray hydrogen system work).But the shunt of scheme one or scheme two control spray hydrogen is conducive to improve the control accuracy of hydrogen injection device.Because the one, every road hydrogen injection device in use has time-delay and error, multichannel hydrogen injection device uses jointly can be with the accumulation of error; The 2nd, vehicular engine often is operated in middle small load condition, if use in this case few hydrogen injection device number can reduce the overall utilization efficiency of hydrogen injection device, strengthens overall working life and the reliability of hydrogen injection device.Here it is after actual spray hydrogen pulsewidth is greater than the single channel maximum pulse width, just adopts two hydrogen spraying valves to work simultaneously; After reality spray hydrogen pulsewidth is greater than 2 times of single channel maximum pulse width, just adopt three hydrogen spraying valves to work simultaneously; But not from the beginning, just adopt the reason of the spray hydrogen strategy that three hydrogen spraying valves work simultaneously.
The software flow pattern of the distribution of each injection valve injection pulse width of spray hydrogen strategy protocol one as shown in Figure 4.
Hydrogen-fueled internal combustion engine abnormal combustion controlling method of the present invention is used multichannel spray hydrogen system, according to the intensity of abnormal combustion and take into account Economy and the power character of motor, takes respectively different measures to suppress abnormal combustion.
After having occured, pre-ignition in the abnormal combustion takes following two kinds of inhibition schemes:
1) multidiameter delay spray hydrogen
Scheme three: in a single day system detects the generation of pre-ignition and just abandons using segmentation spray hydrogen strategy, use simultaneously three hydrogen spraying valve work, each hydrogen spraying valve is born the spray hydrogen pulsewidth of equivalent, and every road spray hydrogen system pulsewidth is reduced also fully near the air inlet close moment.This scheme generally occurs in when early stage in the pre-ignition phenomenon, and the pre-ignition situation not too seriously is that pre-ignition intensity is used during less than the pre-ignition threshold value, lowers drawbacks such as spraying control accuracy though have, and does not lose motor Economy and power character.Be the preferred option that suppresses early stage pre-ignition phenomenon, its principle as shown in Figure 5.
2) multidiameter delay spray hydrogen combines with the postponement ignition timing
When the pre-ignition strength ratio is more greatly in the situation of pre-ignition intensity greater than the pre-ignition threshold value, rely on merely scheme three to be not enough to suppress pre-ignition.At this moment, except spraying simultaneously the hydrogen, also need to adopt the strategy of postponing ignition timing further to suppress pre-ignition.Namely take multichannel to spray simultaneously the scheme four inhibition pre-ignition that hydrogen combines with the postponement ignition timing.
But postpone the ignition timing meeting and have influence on motor Economy and power character, therefore, need to balance postpone igniting to the impact and the inhibition degree of postponement igniting to tempering of engine performance.Generally speaking, postpone igniting engine performance is reduced, as shown in Figure 6.And it is just opposite on the situation that affects that pre-ignition suppresses to postpone igniting, and the concept that we draw a pre-ignition inhibition degree herein illustrates that pre-ignition inhibition degree namely is the inhibition that ignition timing occurs pre-ignition.Within the specific limits, postpone igniting, the probability that pre-ignition occurs can reduce gradually, and can reduce rapidly near top dead center, i.e. the more late pre-ignition inhibition of ignition timing degree is higher.The graph of a relation of concrete pre-ignition inhibition degree and ignition advance angle as shown in Figure 6, the inhibition degree of pre-ignition shown in the figure and engine performance (explanation as an example of the Economy curve example, the power character curve is not shown) are along with the plots changes of ignition timing is opposite before close engine tope center.Postpone igniting according to pre-ignition degree appropriateness, be about to postpone igniting and suppress the pre-ignition degree, and with take into account engine performance and be associated.Postpone igniting and be conducive to suppress pre-ignition, but engine power performance and Economy are descended; And it descend to change and nonlinear, by initial mild reduce section to subsequently rapidly descending branch consist of; Appropriateness refers to postpone igniting, time of ignition still is in makes engine power performance reduce gently a time of ignition corresponding to section with Economy.
To sum up analyze, use time-delay to spray under the parallel prevention pre-ignition and tempering (scheme one) situation of hydrogen, multichannel spray hydrogen system, the strategy that needs multidiameter delay spray hydrogen strategy (scheme two) or adopt multidiameter delay spray hydrogen to combine with the postponement ignition timing further suppresses pre-ignition.At this time need to weigh the pros and cons of postponing between the impact that igniting causes the inhibition degree of pre-ignition and the decline on engine performance, make suitable choice.Under the cooperation of above several schemes, can suppress significantly the generation of pre-ignition or tempering.The phenomenon that pre-ignition causes tempering still can occur in hydrogen engine accidentally under some extreme operating condition.In case this situation occurs, and need to suppress rapidly tempering because tempering when occuring in the suction tude mixture combustion can continue to increase temperature in the suction tude, cause circulation next time to continue the vicious circle of tempering, finally make engine misses.So, spray simultaneously hydrogen and postpone igniting and wait the scheme that suppresses pre-ignition except using, also need following two kinds can the establishment tempering strategy.
3) at first, slight tempering occurs is tempering intensity less than the tempering threshold value after, use revised scheme four, the strategy that adopts multidiameter delay spray hydrogen to combine with the postponement ignition timing, but postpone ignition timing and no longer take into account engine performance, directly significantly postpone fast ignition timing, be scheme five.If detect tempering greater than a circulation at motor, namely there are continuous two circulations all to detect tempering, then getting this situation is the tempering threshold value; If continuously 3-5 circulation detects and begin the pre-ignition time and all constantly shift to an earlier date, then be that pre-ignition intensity is large, otherwise be that intensity is little.
4) when occur tempering surpass slight scope namely greater than the tempering threshold value after, take respectively different measures according to the operating mode of tempering degree and generation (rule of thumb hydrogen engine under idling operation and high load working condition than being easier to occur tempering).If tempering occurs under the large load, the scheme six of taking to reduce load suppresses tempering fast, reduces load and can reduce spray hydrogen pulsewidth, makes significantly spray hydrogen near the air inlet ultimate position, reduces the possibility of tempering.After the load reduction, motor just is under the medium and small load in addition, and medium and small load condition motor also is difficult for occuring tempering.The reduction amount of load depends on tempering intensity.For making problem reduction, take segmentation to reduce the method for loading, such as taking two sections or maximum three sections even diminishing methods.If tempering is inhibited after the load reduction scheme taking, then can progressively recover load after the motor steady running until do not reduce.If after reducing load, the tempering strength decreased is not obvious, continues to reduce engine load and reduce spray hydrogen pulsewidth, until tempering phenomenon is eliminated.And along with the reduction tempering problem of load can be inhibited, so that temperature can reduce in the suction tude, further reduce the tempering probability of happening, meeting enters optimum work cycle so that system breaks away from the vicious circle of tempering.If tempering occurs under the idling operation, situation is just opposite, need to suitably strengthen loading, and take segmentation to increase the method for loading, and is regional such as taking two sections even increment method to reach middle small load condition, thereby suppresses tempering.In sum, we can draw program circuit that pre-ignition, tempering suppresses as shown in Figure 7.
The hydrogen-fueled internal combustion engine abnormal combustion controlling method of hydrogen-fueled internal combustion engine shown in the flow chart 7, step is as follows:
(1) calculates correction according to systematic parameter and draw basic ignition advance angle and the timing of spray hydrogen;
(2) each hydrogen spraying valve pulsewidth and timing of time-delay spray hydrogen policy calculation;
(3) detect whether pre-ignition; If pre-ignition intensity is then measured in pre-ignition, if pre-ignition intensity is low, then take to spray simultaneously hydrogen strategy A, if pre-ignition intensity is high, then sprays simultaneously hydrogen and postpone igniting B, then execution in step (4); If there is not then direct execution in step (4) of pre-ignition;
(4) detect and record Annealed Strip, if check operating mode this moment, if be in large load, then suitably reduce and load; Then suitably increase load if be in idling operation; If be not to detect tempering, direct execution in step (5) then;
(5) the corresponding spray hydrogen of output timing, spray hydrogen amount, ignition timing.
It should be noted last that: above embodiment is the non-limiting technological scheme of the present invention in order to explanation only, although with reference to above-described embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that; Still can make amendment or be equal to replacement the present invention, and not break away from any modification or partial replacement of the spirit and scope of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (8)
1. a hydrogen-fueled internal combustion engine tempering prevention method is characterized in that, uses at least two-way spray hydrogen device spray hydrogen, and the method may further comprise the steps:
(1) spray hydrogen device adopts the working method spray hydrogen of parallel fragmentation; Adopt the working method spray hydrogen of parallel fragmentation to refer to select to enable a few road spray hydrogen devices according to the reality spray hydrogen duration, and the parallel spray hydrogen task of finishing of each road spray hydrogen device of enabling;
(2) being engraved in INO during spray hydrogen device early start spray hydrogen delays time later on and sprays hydrogen after the set time;
(3) be fixed on suction valve the finish time of spray hydrogen and begin close moment;
The spray hydrogen of each road spray hydrogen device is fixed the finish time in the described step (3), and the spray hydrogen of spray hydrogen device is also identical the zero hour, and the hydrogen spraying valve that sprays the hydrogen devices except all the other each roads of one tunnel spray hydrogen device is fixed on maximum spout hydrogen pulsewidth place, and constantly begins to spray hydrogen at early start spray hydrogen; Remaining spray hydrogen pulsewidth is finished by described one tunnel spray hydrogen device.
2. hydrogen-fueled internal combustion engine tempering prevention method according to claim 1, it is characterized in that: be fixed on suction valve and begin close moment and leave a small amount of surplus the finish time of spraying hydrogen in the described step (3), can all enter cylinder so that spray into suction tude hydrogen, in the suction tude noresidue.
3. hydrogen-fueled internal combustion engine abnormal combustion inhibition method is characterized in that, uses at least two-way spray hydrogen device spray hydrogen, and the method may further comprise the steps:
(1) in a single day system detects the generation of pre-ignition, and pre-ignition intensity just uses at least parallel spray of two-way spray hydrogen device hydrogen during less than the pre-ignition threshold value simultaneously, and wherein every road spray hydrogen device is born the spray hydrogen pulsewidth of equivalent;
(2) when detecting pre-ignition intensity greater than the pre-ignition threshold value, then take at least parallel spray of two-way spray hydrogen device hydrogen, and postpone ignition timing, take into account simultaneously engine performance;
(3) when detecting the generation tempering, and tempering intensity less than the tempering threshold value after, take at least parallel spray of two-way spray hydrogen device hydrogen, and directly significantly postpone fast ignition timing, no longer take into account engine performance;
(4) when occur tempering surpass slight scope namely greater than the tempering threshold value after, take measures according to the operating mode of tempering degree and generation: if tempering occurs under the large load, take to reduce load and suppress fast tempering; If tempering occurs under the idling operation, strengthen load and suppress tempering.
4. hydrogen-fueled internal combustion engine abnormal combustion inhibition method according to claim 3, it is characterized in that: postpone igniting according to pre-ignition degree appropriateness in the described step (2), refer to postponement igniting with suppress the pre-ignition degree, take into account engine performance and be associated, time of ignition still is in and makes engine power performance and Economy at a mild reduction section corresponding time of ignition.
5. hydrogen-fueled internal combustion engine abnormal combustion inhibition method according to claim 4 is characterized in that: the reduction amount of load depends on tempering intensity in the described step (4).
6. hydrogen-fueled internal combustion engine abnormal combustion inhibition method according to claim 5 is characterized in that: described step (4) if in tempering behind load reduction, be inhibited, then progressively recover load after the motor steady running until do not reduce; If after reducing load, the tempering strength decreased is not obvious, continues to reduce engine load and reduce spray hydrogen pulsewidth, until tempering phenomenon is eliminated.
7. each described hydrogen-fueled internal combustion engine abnormal combustion inhibition method is characterized in that according to claim 3-6, and the mode that segmentation reduces or strengthens is taked in the reduction of load and increasing in the described step (4).
8. hydrogen-fueled internal combustion engine abnormal combustion inhibition method according to claim 7 is characterized in that, described segmentation is to deduct 10% load percentage according to the there and then corresponding percentage of loading, and minutes two sections or three sections evenly successively decrease, or successively decrease with the 20%-25% Rate of load condensate; Increase progressively according to 20% Rate of load condensate during idling.
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| CN106322431A (en) * | 2015-06-24 | 2017-01-11 | 长沙文兴能源科技有限公司 | Working process of burner controller |
| CN110552805A (en) * | 2019-08-27 | 2019-12-10 | 华北水利水电大学 | combustion control system and method for hydrogen repeated direct injection internal combustion engine |
| CN114320625A (en) * | 2021-12-31 | 2022-04-12 | 中国第一汽车股份有限公司 | Control method and system for hydrogen injection of engine, processor and electronic device |
| CN114837833B (en) * | 2022-05-24 | 2023-06-23 | 潍柴动力股份有限公司 | Method and device for reducing tempering hazard of natural gas hydrogen-doped engine |
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| JP3279331B2 (en) * | 1992-02-03 | 2002-04-30 | マツダ株式会社 | Fuel supply system for gaseous fuel engine |
| JPH06193480A (en) * | 1992-12-24 | 1994-07-12 | Mazda Motor Corp | Fuel supply device for hydrogen engine |
| JPH07197822A (en) * | 1993-12-29 | 1995-08-01 | Mazda Motor Corp | Fuel supply device of gaseous fuel engine |
| JP3075685B2 (en) * | 1995-09-04 | 2000-08-14 | 本田技研工業株式会社 | Fuel injection method for gaseous fuel engine |
| JP2007278144A (en) * | 2006-04-05 | 2007-10-25 | Mazda Motor Corp | Fuel injection device for engine |
| CN101260846B (en) * | 2007-12-27 | 2011-07-13 | 奇瑞汽车股份有限公司 | Hydrogen engines and its burnt gas jet method |
| CN101368527B (en) * | 2008-08-13 | 2010-04-07 | 奇瑞汽车股份有限公司 | Hydrogen gas fuel internal combustion engine, its hydrogen gas injection system and combustion method |
| CN101798965B (en) * | 2010-02-26 | 2013-07-24 | 华北水利水电大学 | Method and device for controlling abnormal combustion of hydrogen-fueled engine |
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