CN100343502C - Common-rail fuel oil injection system injector failure diagnosing method - Google Patents
Common-rail fuel oil injection system injector failure diagnosing method Download PDFInfo
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- CN100343502C CN100343502C CNB2005100861961A CN200510086196A CN100343502C CN 100343502 C CN100343502 C CN 100343502C CN B2005100861961 A CNB2005100861961 A CN B2005100861961A CN 200510086196 A CN200510086196 A CN 200510086196A CN 100343502 C CN100343502 C CN 100343502C
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Abstract
The present invention relates to a method for diagnosing the failure of a fuel sprayer in a common rail fuel spraying system, which mainly uses a software method to judge the failure of a mechanical system of the fuel sprayer of a fuel spraying system. When the method of the present invention is used for diagnosing the generated failure of the fuel sprayer of the spraying system, the collection and the analysis of the instantaneous state rotary speed of an engine are firstly used, and then, according to a fuel spraying compensation quantity obtained by a balance control algorithm between cylinders of the engine, the variation tendency of the compensation quantity is counted and analyzed. A method of probability statistics is used for judging whether the spraying system generates failures. Simultaneously, in order to prevent the failure of the spraying system from being judged in error, on the premise that the statistical law of the compensation quantity is used for judging the failure of the spraying system, the method combines the distribution law of the pressure of each working cycle common rail cavity for analysis so as to judge whether a failure source comes from the fuel spraying system precisely, and therefore, the accuracy of the failure judgement of the fuel spraying system can be greatly improved.
Description
Technical field
The present invention relates to the method for diagnosing faults of diesel fuel injection system, particularly relate to the oil sprayer method for diagnosing faults of Common rail fuel injection system.
Background technique
In the existing electronic diesel injection system, much had the injection system trouble-shooter.Chinese patent CN1112508C discloses a kind of method for diagnosing faults and device thereof of diesel fuel engine injection system.Take on fuel injection camshaft, to install the method for a pulse frequency higher rotation speed sensor, utilize the relation of transient rotative speed fluctuation and plunger cavity variation in pressure, judge the injection system fault, this method only is applicable to the electric control diesel pump---pipe---mouth injection system, and can not be applied to Common rail fuel injection system; Another kind of method is to utilize vibration, the noise signal of pressure transducer or collection motor to carry out fault judgement, but these methods need increase extra sensor on the one hand, need rich experience that measurement signal is screened meticulously and analyzes on the other hand, therefore, not only increase cost in the practical application, and caused erroneous judgement easily.
Summary of the invention
At the deficiencies in the prior art and defective, purpose of the present invention and task provide a kind of oil sprayer method for diagnosing faults of Common rail fuel injection system, it is characterized in that: the difference of measuring each cylinder transient rotative speed of motor earlier with crankshaft rotational speed sensor, utilize diagnostic software to determine the cylinder that breaks down according to balance fuel injection quantity backoff algorithm between engine cylinder, the common rail cavity pressure Changing Pattern that measures according to pressure transducer judges whether injection system the oil sprayer fault takes place again, determines the accurate position of the source of trouble.
The technological scheme that is adopted when realizing method for diagnosing faults of the present invention is: take the first step to measure the transient rotative speed of each cylinder of motor after oil spout earlier, second step was calculated the oil spout compensation rate q of each cylinder needs according to the difference of transient rotative speed
iThe 3rd step is according to each cylinder oil spout compensation rate q
iThe variation tendency and the regularity of distribution proofread and correct, determine the cylinder that breaks down and tentatively judge whether this cylinder injector breaks down.Simultaneously,, determine the accurate position of the source of trouble, adopted and analyzed rail cavity pressure ripple pressure differential deltap p altogether for further accurately judging injection system oil sprayer fault
cWhether greater than in advance by demarcating pressure difference limit value (the Δ p that determines
c)
MaxMethod, judge whether to take place the stuck or fuel injection quantity of oil sprayer and continue excessive and cause type fault such as common rail parts flow-limiting valve action; Simultaneously can also get rid of other type fault (as faults such as diesel engine air inlet system and exhaust system or piston assemblys) that does not belong to fuel injection system.
Compare with prior art, beneficial effect of the present invention and advantage are: the present invention utilizes the original crankshaft rotational speed sensor of common rail for diesel engine fuel injection system and is total to the common rail pressure sensor measurement transient rotative speed fluctuation on the rail parts and is total to rail cavity pressure ripple, and do not need to increase any extra sensor and peripheral unit, can on the basis of existing Common rail fuel injection system, utilize software algorithm to realize the oil sprayer fault diagnosis, and the common rail cavity pressure variation tendency of combination is carried out the accurate judgement of the source of trouble, thereby avoided utilizing transient rotative speed to carry out the deficiency of fault judgement merely, can only diagnose total effect behind the diesel combustion when promptly utilizing transient rotative speed to carry out fault judgement, it not only comprises course of injection, also comprises the state of other parts such as diesel engine air inlet system and exhaust system and piston assembly.Therefore, utilize the transient rotative speed failure judgement to be difficult to differentiate fault merely and whether come from oil-fired system itself, still by due to other reason.Adopt diagnostic method of the present invention can be reliably to the Common rail fuel injection system fault diagnosis of not disintegrating, and do not need to change any structure of existing common rail system, so cost is low, judge reliably, be easy in the product of producing in batches, implement.
Description of drawings
Fig. 1 is the phase relationship of engine crankshaft and high-pressure fuel-feed pump rotational speed pulse signal;
Fig. 2 is the FB(flow block) of balance fuel injection quantity backoff algorithm between engine cylinder in the diagnostic method of the present invention;
Fig. 3 is the relation curve of transient rotative speed difference Δ n and oil spout compensation rate step delta q;
Fig. 4 is certain cylinder oil spout compensation rate q of countershaft t (cycle-index) expansion at any time under the normal condition
iThe regularity of distribution;
When Fig. 5 is the injection system fault, certain cylinder oil spout compensation rate q of countershaft t (cycle-index) expansion at any time
iThe regularity of distribution;
Fig. 6 is the integrated application processing module drive circuit of a Common rail fuel injection system schematic diagram;
Fig. 7 is the drive circuit faut detection schematic diagram of Common rail fuel injection system;
Fig. 8 is the common rail cavity pressure change curve under the normal condition;
Fig. 9 is the common rail cavity pressure change curve under the fault situation;
Figure 10 is the fault judgement FB(flow block) of diagnostic method of the present invention.
Embodiment
Describe embodiment, working principle and the preferred embodiment of oil sprayer method for diagnosing faults of the present invention in detail below in conjunction with accompanying drawing.
Accompanying drawing is an example with one six cylinder four-stroke co-rail diesel machine, and the firing order of motor is 1-5-3-6-2-4.Bent axle (or flywheel) fluted disc that is used to measure the engine transient rotating speed is 48 scarce 3 toothings.Being contained in the pulse signal fluted disc that is used to differentiate cylinder on the high-pressure fuel-feed pump is the 6+1 toothing.Fig. 1 represents the phase relationship of engine crankshaft and high-pressure fuel-feed pump rotational speed pulse signal.In Fig. 1, the respective cylinder compression top center is positioned at this cylinder and declares about 75 ° of crank angle places behind the cylinder signal.The transient rotative speed that can reflect motor for the signal that makes collection well.With first cylinder is example, with the signal pulse trailing edge is benchmark, in the 0 tooth position recording timing device time of every cylinder crankshaft sensor pulse, recording timing device time once more in bent axle 12 tooth positions then, crank angle between the two is 12 * (360 °/48)=90 °, if therefore measure the bent axle revolution when crossing 90 ° the timer difference in count just can calculate this cylinder transient rotative speed.For for simplicity, can directly utilize result after the timer count value calibration in 90 ° of crank angles as the measurement index of transient rotative speed.Because timer usually in the microsecond level, therefore directly utilizes the timer count value can improve precision greatly as the transient rotative speed index.
In view of the above, when implementing method for diagnosing faults of the present invention, will at first gather each cylinder injector spray before and after the transient rotative speed of motor, and, fuel injection quantity is compensated at next circulation time according to the difference of each cylinder transient rotative speed.Ideally, the transient rotative speed between each cylinder after oil spout does not have difference (Δ n=0), then oil spout compensation rate q
iBe zero, at this moment the oil spout compensation rate of Practical Calculation and compensation limit value q
MaxThe relative distance maximum; When the oil sprayer performance there are differences between each cylinder, then in the transient rotative speed generation difference (Δ n ≠ 0) between each cylinder after the oil spout, for making the transient rotative speed of each cylinder reach unanimity, then need according to transient rotative speed difference (Δ n), determine oil spout compensation rate adjustment step-length according to Fig. 3 or the employing lookup table mode similar, to next circulation basic fuel injection amount q to Fig. 3
BaseCompensate.Diagnostic software has stipulated upper limit value and lower limit value ± q to the oil spout compensation rate
MaxAnd break down when oil sprayer, for example oil sprayer is stuck or because of fuel injection quantity continues excessively to cause that common rail flow-limiting valve action stops oil spout etc., then in order to remedy speed difference, respective cylinder oil spout compensation rate q after some circulations
iReach or approaching compensation limit value q
Max, and before fault is got rid of, keep the similar regularity of distribution always.Therefore, calculate each cylinder oil spout compensation rate q
iWith compensation limit value q
MaxRelative distance can directly reflect oil sprayer fault state and performance.
The diagnostic method of the present invention probability limit value P that calculates by oil spout compensation rate and compensation limit value relative distance sum given in advance
RoFor given cylinder, if the up-to-date N of countershaft at any time
1Individual circulation oil spout compensation rate q
iThe relative distance sum of distribution results and compensation limit value then can be judged and break down less than given limit value.Simultaneously, for whether judging this fault, also need further the variation in pressure rule that is total to the rail chamber to be analyzed from fuel injection system.Because the compensation rate that latest computed obtains is to gather N
1After the individual statistical sample, therefore original N
1In the individual sample the earliest result calculated will withdraw from statistical sample, i.e. N
1The individual statistical sample data that are used for trouble analysis are followed " first in first out " principle.Therefore, in case oil sprayer break down, then pass through some circulations after because the offset institute of compensation rate sample after will being taken place by fault progressively substitute, therefore, sample statistics result and compensate the relative distance d of limit value
iTo be more and more littler, final relative distance sum can be lower than limit value given in advance, and then can judge fault has taken place, then, again in conjunction with whether being total to the further failure judgement of rail cavity pressure variation tendency source from fuel injection system.
According to above-mentioned principle, when the oil sprayer compensation rate reaches limit value, when still being not enough to proofread and correct the transient rotative speed difference between each cylinder of motor after some circulations, illustrate that fault may take place injection system, therefore need calculate each cylinder oil spout compensation rate q of countershaft at any time
iWith compensation limit value q
MaxRelative distance, and provide apart from sum probability limit value P
RoAnd when fault judgement, use up-to-date N all the time
1Compensation rate statistic analysis result in the individual circulation is as the foundation of injection system oil sprayer fault judgement.In addition, on time shaft, collect each cylinder oil spout compensation rate q
iVariation tendency the time, also should be superimposed illustrates, and these data are carried out statistical analysis, judges its regularity of distribution, rather than simply compensation rate mean value directly as the foundation of fault judgement.In addition, need be to each cylinder oil spout compensation rate q of countershaft at any time
iDistribution when carrying out statistical analysis, oil spout compensation rate q only is shown
iWith compensation limit value q
MaxRelative distance sum D be lower than given probability limit value P
Ro, (100%-D)＞P just only is shown
RoThe time the oil sprayer fault of injection system.
Fig. 2 is the FB(flow block) of balance oil spout compensation rate algorithm between engine cylinder in the oil sprayer method for diagnosing faults of the present invention.The transient rotative speed of first step measurement each cylinder of motor before and after oil spout in the diagnostic method is exactly the step S10 among the figure.Second step was calculated the oil spout compensation rate q of each cylinder needs according to the difference of transient rotative speed
iBe exactly step S20 and S30.Timer count value after directly S10 being calibrated in step S20 is subtracted each other the measurement index as transient rotative speed difference Δ n.The 3rd step according to the variation tendency of each cylinder oil spout compensation rate and the regularity of distribution is proofreaied and correct and tentatively judge this cylinder injector whether break down be exactly step S30 and after step.Step S30 is for to obtain oil spout compensation rate step delta q according to rotation speed difference deltan n computation of table lookup, and confirms the fuel injection quantity q that should adjust at next circulation time
iCylinder oil spout compensation rate q during actual motion
iMay in some circulations, be divided into the whole limit value that just reaches regulation of some steps.Q for example
i=Δ q
1+ Δ q
2+ Δ q
3+ ..., wherein oil mass is adjusted step delta q
iBe not both variable according to speed discrepancy.When the speed discrepancy absolute value reaches maximum value Δ n
MaxAfter, Δ q
iAlso reach the compensation limit value Δ q of regulation
Max, this is a constant.Step S40 judges the variation tendency of transient rotative speed after the oil spout of this cylinder, when transient rotative speed increases, i.e. and the result of calculation (n of step S20
i-n
I-1) be negative, show that needs reduce this cylinder oil mass, therefore, enter step S60; When cylinder before this cylinder rotating ratio reduced, promptly the result of calculation of step S20 was positive number, showed that then needs increase this cylinder oil mass, and program enters S50, and the scope to each cylinder oil spout compensation rate in step S70 limits, and promptly the oil mass adjusted value is limited to [q
Max, q
Max] in, this result of calculation will be adjusted the basic fuel injection amount of respective cylinder in next circulation, promptly add oil spout compensation rate q on basic oil mass basis
iAs the actual fuel injection amount of this cylinder, step S80 storage is by the result of calculation of cylinder balance oil spout backoff algorithm.
Fig. 3 is rotation speed difference deltan n and oil spout compensation rate step delta q relation curve, and abscissa is the difference n of work at present cylinder transient rotative speed and last cylinder transient rotative speed among the figure
i-n
I-1, its actual physical significance is the result after the timer count value calibration.The oil spout compensation rate step delta q of y coordinate for needing, the basic trend of curve is not compensation when speed discrepancy is zero, and when speed discrepancy increased, oil spout compensation rate step delta q also increased thereupon; When the speed discrepancy absolute value reaches maximum value Δ n
MaxAfter, oil spout compensation rate step-length also reaches maximum value Δ q
MaxAfter this when speed discrepancy increased again, oil spout compensation rate step delta q kept maximum value Δ q always
Max
Fig. 4 is the regularity of distribution of certain cylinder oil spout compensation rate q of normal condition countershaft t (cycle-index) expansion at any time.Abscissa is a cycle-index in the figure, represent time shaft t, take turns to operate with motor six cylinders and once to count a circulation, specific cylinder oil spout compensation rate q fluctuates within the specific limits during the fuel oil injection system injector proper functioning, and oil spout compensation rate q can not continue to equal limit value q
Max
Fig. 5 is certain cylinder injector when breaking down, at any time the regularity of distribution of the oil spout compensation rate q that launches of countershaft t (cycle-index).When electric control fuel oil jet system broke down, when stuck or fault situation such as cause that oil sprayer can not cut out took place as oil sprayer, at this moment, engine operation was rough, deterioration of emission, and fuel economy reduces greatly.Therefore, the flow-limiting valve on the common rail pipe will move, and significantly reduce even stop oil spout thereby cause the fault cylinder to spray oil mass.At this moment because the oil mass backoff algorithm is still effective, significantly reduced or stopped oil spout but the fault cylinder sprays oil mass, therefore, the oil spout compensation rate q that obtains according to balanced algorithm is increasing, and finally reaches positive threshold limit value q
MaxNear.Because the relative basic fuel injection amount q of result that backoff algorithm obtains
BaseLess, and when oil sprayer broke down, the method for utilizing backoff algorithm to increase fuel injection quantity still can not be adjusted fault cylinder transient speed difference, and therefore, oil spout compensation rate q will remain near the compensation limit value always or equal to compensate limit value q
Max
Fig. 6 is integrated application processing module fuel oil injection system injector driving principle figure.For improving the ejecting system dynamic response, at first utilize the driving high pressure that ejecting system oil sprayer final controlling element (electromagnetic coil or piezoelectric crystal) is driven, drive high pressure usually more than 100 volts, after this utilize battery tension (for example 24 volts) to keep driving current, two-way drives respectively and drives high-power MOS tube by integrated application processing module output control signal.Every road drives all the detection loop, is used to judge whether ejecting system drives normal, and last electric current drives the ejecting system oil sprayer by diode output.
Fig. 7 is the fault-detecting circuit schematic diagram of Common rail fuel injection system.When input control signal drives, high power valve is on state, therefore can be by resistance measurement network detection system current status, and carry out signal by amplifier LM2904 and amplify, the diagnostic feedback signal is input to single-chip microcomputer mould/number conversion interface, judge by the scope of sampled value whether system power occurs unusually, thereby judge whether fuel injection system is working properly.
Fig. 8 is the pressure history that is under normal circumstances measured by the common rail pressure sensor that is installed on the common rail pipe parts.It shown in the figure six cylinder engine rail pressure change curve, rail pressure some decline a little after the fuel injection system oil spout, rail pressure bottom out again behind the high-pressure oil feed oil pump feed then, so in the circulation that six cylinders take turns to operate, have six tangible crests and trough except the disturbance of microcosmic, this fluctuation is a uniformity under the normal condition steady state condition.
Fig. 9 is the common rail cavity pressure change curve under the fault situation.When fuel injection system breaks down, pass through some work cycle in this case after, can hinder for some reason and cause a certain cylinder to stop oil spout.Therefore, after ECU (Electrical Control Unit) is sent the injection control signal, because normally oil spout, so the pressure waveform in rail chamber takes place unusual altogether, just normal decline do not appear in pressure wave after the fuel injection signal of fault cylinder, and pressure has unusual rising again behind the high-pressure oil feed oil pump feed then.Be exactly that second cylinder stops the unusual waveforms to occur after the oil spout shown in Fig. 9.Normal trough does not appear on the position that is equivalent to two cylinder fuel injection signal back among the figure; And behind the oil feed pump fuel feeding, in the curve crest higher slightly than other each cylinder can appear.With Ben Tu and Fig. 8 contrast, can obviously find out the second cylinder unusual sign of rail cavity pressure curve appearance altogether.
Figure 10 is the fault judgement flow chart that diagnostic method of the present invention adopts.It also is the program of carrying out after flow process shown in Figure 2.According to the analysis of Fig. 5, if analyzed N
1Individual circulation oil spout compensation rate q
iThe regularity of distribution just can judge whether to have taken place fault.Step S90 calculates current oil spout compensation rate q
iWith compensation limit value q
MaxRelative distance d
i, relative distance d
iFormula as follows:
If current oil spout compensation rate q
iReached compensation limit value q
Max, relative distance d then
iEqual zero.Oil spout compensation rate absolute value is more little, and then relative distance is big more.Step S100 calculates up-to-date N
1Individual circulation relative distance sum D.Because relative distance is absolute value, therefore the situation of positive and negative counteracting can not appear.Step S110 judges whether drive circuit is normal, promptly drives and diagnosis principle according to the ejecting system shown in Fig. 6 and 7, and the diagnostic feedback circuit interface is input to mould/number conversion port of control unit ECU.Judge according to the size of diagnostic feedback mesh current value whether jet drive is normal again,, then directly finish diagnostic routine and display circuit fault if it is unusual to find that drive circuit occurs.
Whether step S120 judges relative distance sum D more than or equal to 100%, if D 〉=100% then shows oil spout compensation rate q
iAbsolute value also smaller, from compensation limit value q
MaxDistance bigger, therefore can't affirm that at this moment fault has taken place fuel injection system, direct end diagnostic routine.When D＜100% program enters step S130, because oil spout compensation rate q when breaking down
iNear or equal to compensate limit value q
Max, so result of calculation D is less, so can be according to (100%-D) whether greater than probability limit value P given in advance
RoJudge whether to break down, if be not more than P
RoThen finish diagnostic routine.If greater than P
Ro, then enter step S140, so that further whether affirmation belongs to the injection system fault.This is because occur when unusual when diesel engine air inlet system and exhaust system or piston assembly, also can take place to hinder the cylinder underpower for some reason and causes transient rotative speed decline, oil spout compensation rate q
iCan reach compensation limit value q
MaxEtc. similar symptom.According to the common rail cavity pressure change curve shown in Fig. 8 and 9, when the ejecting system oil sprayer breaks down, change has taken place in the pressure wave and the normal condition in rail chamber altogether, and at this moment when the diesel engine air inlet system and exhaust system broke down, the pressure wave in rail chamber anomaly can not occur altogether.So, can further confirm the source of trouble by being total to rail cavity pressure change curve.
Because t before ejecting system sprays
1Be total to rail cavity pressure p constantly
cMaximum (crest) appears, and before the high-pressure fuel-feed pump commencement of fuel supply t
2Minimum (trough) appears in the rail cavity pressure altogether constantly, so t
1The moment and t
2Constantly represented the amplitude of variation of pressure in course of injection.Employing is installed in common rail pressure sensor on the common rail pipe to common rail pressure p
cSampling is defined as s respectively with mould/number conversion value
1And s
2, now define rail pressure p
cCalibration formula be:
p
c＝K×(V-V
0)
In the formula: K---rail pressure sensor calibration coefficient, the Bar/ of unit volt;
V---actual samples magnitude of voltage, the unit volt;
V
0---corresponding voltage value when rail pressure is zero, unit volt.
The power supply voltage of supposing common rail pressure sensor is 5.0 volts, and the sampling precision of microcontroller mould/number conversion is 12bit, K=500, V
0=1.0, double sampling rail pressure differential deltap p then
cFor:
Corresponding diagram 8, its voltage functuation probably are 100mV, and then corresponding pressure is 5MPa, and corresponding mould/number conversion digital quantity difference is 82.Pressure surge directly utilizes mould/number conversion result to calculate (Δ p in step S140
c)
MaxBe the normal injection pressure difference limit value of determining according to demarcation, its data under different operating modes can be stored in the program by form.
In S140, if fluctuation is greater than storage pressure difference limit value (the Δ p that demarcates in advance
c)
Max, then diagnostic routine finishes.Show can not the failure judgement source from fuel injection system, phenomenon of the failure may cause owing to reasons such as gas handling system or piston assemblys.If pressure surge is less than limit value (Δ p
c)
Max, then enter step S150, carry out frequency n accumulative total.Step S160 carries out cumulative number and judges, if n＞N
2(N
2Be the number of times limit value of determining according to actual conditions), then show N continuous
2The inferior normal injection that occurs is total to the fluctuation of rail cavity pressure less than the limit value of demarcating, can confirm the fuel injection system fault, enter step S170 and confirm the fuel injection system fault, and carry out scene protection at step S180, be that storage failure is confirmed engine condition constantly, these information have very important significance to later system trouble analysis; If n≤N
2, expression still is not enough to sure ejecting system oil sprayer fault, and then this time fault judgement finishes, and malfunction routine continues to move fault judgement flow process next time.
Above-described embodiment comprises cited FB(flow block), in the scope that content and claim of the present invention covered multiple modification and change can be arranged.Therefore, described embodiment does not constitute the restriction to claim protection domain of the present invention.
Claims (7)
1. the oil sprayer method for diagnosing faults of a Common rail fuel injection system, it is characterized in that: the difference of measuring each cylinder transient rotative speed of motor earlier with crankshaft sensor, utilize diagnostic software to determine the cylinder that breaks down according to balance fuel injection quantity backoff algorithm between engine cylinder, the common rail cavity pressure Changing Pattern that records according to common rail pressure sensor judges whether injection system breaks down again, determines the accurate position of fault.
2. oil sprayer method for diagnosing faults according to claim 1 is characterized in that: above-mentioned diagnostic method takes the first step to measure the transient rotative speed of each cylinder of motor after oil spout when failure judgement; Second step was calculated the oil spout compensation rate q of each cylinder needs according to the difference of transient rotative speed
iThe 3rd step is according to each cylinder oil spout compensation rate q
iThe variation tendency and the regularity of distribution proofread and correct, and judge tentatively whether this cylinder injector breaks down.
3. oil sprayer method for diagnosing faults according to claim 1 is characterized in that: for accurately judging oil-fired system oil sprayer fault, determine the accurate position of the source of trouble, adopted and analyzed rail chamber oil spout front and back pressure difference Δ p altogether
cWhether greater than in advance by demarcating limit value (the Δ p that determines
c)
MaxMethod, judge whether to take place the stuck or fuel injection quantity of oil sprayer and continue excessive and cause type fault such as common rail parts flow-limiting valve action, simultaneously, get rid of other type fault that does not belong to fuel injection system.
4. oil sprayer method for diagnosing faults according to claim 2 is characterized in that: if the transient rotative speed after oil spout does not have difference, then oil spout compensation rate q between each cylinder
iBe zero; If the transient rotative speed between each cylinder after oil spout there are differences, then according to transient rotative speed discrepancy delta n to circuit basic fuel injection amount q once
BaseCompensate; Simultaneously the oil spout compensation rate has been stipulated upper limit value and lower limit value ± q
Max, when the oil spout compensation rate reaches limit value and still is not enough to proofread and correct transient rotative speed between each cylinder, each cylinder oil spout compensation rate of countershaft at any time distributed carry out statistical analysis, sum up its regularity of distribution, and provide probability limit value P
RoFoundation as fault judgement.
5. oil sprayer method for diagnosing faults according to claim 4 is characterized in that: to each cylinder oil spout compensation rate q of countershaft at any time
iWhen carrying out statistical analysis, utilize up-to-date N
1Individual circuit oil spout compensation rate q
iWith compensation limit value q
MaxRelative distance calculate, and provide probability limit value P
Ro, and when fault judgement, use up-to-date N all the time
1Oil spout compensation rate analysis result in the individual circulation is as the foundation of injection system oil sprayer fault judgement.
6. oil sprayer method for diagnosing faults according to claim 4 is characterized in that: as oil spout compensation rate q
iReached compensation limit value q
Max, but still when being not enough to proofread and correct the difference of transient rotative speed between each cylinder, on time shaft, collect each cylinder oil spout compensation rate q
iVariation tendency, and be superimposed and illustrate, these data are carried out statistical analysis, sum up its regularity of distribution, rather than simply compensation rate mean value directly as the foundation of fault judgement.
7. oil sprayer method for diagnosing faults according to claim 6 is characterized in that: to each cylinder oil spout compensation rate q of countershaft at any time
iWhen statistical analysis is carried out in distribution, oil spout compensation rate q only is shown
iWith compensation limit value q
MaxThe injection system oil sprayer fault of relative distance sum when being lower than probability limit value given in advance.
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| CN1773101A (en) | 2006-05-17 |
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