CN102536486A - Method for identifying interruptions - Google Patents

Method for identifying interruptions Download PDF

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CN102536486A
CN102536486A CN2011103487631A CN201110348763A CN102536486A CN 102536486 A CN102536486 A CN 102536486A CN 2011103487631 A CN2011103487631 A CN 2011103487631A CN 201110348763 A CN201110348763 A CN 201110348763A CN 102536486 A CN102536486 A CN 102536486A
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value
galloping
pass filter
filter
low
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CN102536486B (en
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J·伯切尔
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Robert Bosch GmbH
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Robert Bosch GmbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/08—Introducing corrections for particular operating conditions for idling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1497—With detection of the mechanical response of the engine
    • F02D41/1498—With detection of the mechanical response of the engine measuring engine roughness
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
    • F02D41/2425—Particular ways of programming the data

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

The invention relates to a method and a device for identifying interruptions (18) in internal combustion engine. The method is carried out via a run disturbance signal (16) obtained on basis of speed fluctuation calculation. The method involves carrying out a dynamic compensation of the run disturbance signal (16) by a compensation value. A quantity of the differentials of segment time is filtered with a low-pass filter for calculating the compensation value. The maximum value for all differentials (12) of segment time is searched, and is exchanged by a suitable value before the calculation of the filter value (14) of the maximum value.

Description

Be used to discern flame-out method
Technical field
The present invention relates to a kind of be used to discern internal-combustion engine flame-out method and a kind of device that is used to implement this method.
Background technique
The chemical energy of fuel is converted into mechanical work through burning in internal-combustion engine.Occur in the acting chamber in this burning, normally in the cylinder of motor, the mixture of fire fuel and surrounding atmosphere here.
For internal-combustion engine flame-out, also be called as that burning is flame-out to be appreciated that the situation into the fuel burn-out.To this, reason possibly be that ignition mechanism has not proportioning well of fault or fuel air mixture.Burning is flame-out result improved the discharging of hydrocarbon and carbon monoxide on long terms and can endanger catalytic cleaner.Hope flame-out identification of burning from this reason, thereby can take adequate measures where necessary.
Flame-out by the galloping degree signal identification burning that calculates by the fluctuation of speed up to now in internal-combustion engine.The torque difference of the short-term of said galloping degree signal and the burning recurred for twice is proportional.Be noted that here the torque difference that continues can not influence this signal.For each burning, said galloping degree is by two endurance ts nAnd ts N+1Calculate.The said time here is exactly the time between the twice combustion, a promptly so-called period.
When difference occurring between the continuous section time, from this difference, just confirmed so-called period time difference.Therefore the section time difference has been represented the degree (Mass) in order to calculate the used fluctuation of speed of galloping degree signal.
It meets:
Figure BSA00000607682600011
Wherein, C is a scale factor, and it depends on cylinder number.
Burning is taking place when flame-out, said galloping degree signal be on the occasion of.If the expression torque is when increasing, signal is a negative value just.If not flame-out, signal is 0 under the ideal situation.When engine speed gradually changed, one in two time constantly greater than another.This causes calculating constantly a positive negative in other words signal.For fear of this situation, adopted one to consider this rotation speed change precompensation item.Therefore calculate according to following expansion:
Figure BSA00000607682600021
Developed different algorithms for carrying out dynamic compensation, but these algorithms has shortcoming all.Also in this suggestion, when offset value calculation, utilize low-pass filter to filter out a plurality of section time differences of trying to achieve in addition based on the section time difference.
In known method, be proved, perhaps galloping degree signal has only obtained inadequate compensation about rotation speed change, and the perhaps calculating of flame-out interference compensation value like this makes said galloping degree signal before stopping working be continuously negative value.Therefore be devoted to develop a kind of method, thereby overcome said shortcoming at least in part.
Summary of the invention
A kind of method according to claim 1 and a kind of device under this background, have been introduced with characteristic of claim 6.Improvement project is obtained by dependent claims and specification.
Guaranteed that according to the method for being introduced the rough running signal obtains enough compensation about rotation speed change.Can in improvement project, guarantee the flame-out calculating that does not influence offset at least in addition, thereby prevent that said galloping degree signal from the flame-out negative value that always is before taking place.
Therefore the method for being introduced can be used for improving the dynamic compensation to galloping degree signal, thereby said signal is optimally compensated and can not cause that signal mixes
Figure BSA00000607682600022
when flame-out existing
For offset value calculation has been used a plurality of periods time differences, next the said a plurality of periods time differences are called N section time difference.So select N at this, make it possible to enough detect continually.
N depends on that the limiting frequency of expectation and the quality of low-pass filter select.
Said offset calculates thus,
Δts i＝(ts i+1-ts i) i＝0…N-1
Promptly utilize low-pass filter, the for example FIR low-pass filter arranged suitably to filter N section time difference.The low-pass filter that has suitable limiting frequency and quality in principle all is suitable.
FIR low-pass filter wave filter in other words is appreciated that (finite impulse response filter FIR-Filter), also is called as transversal filter in order to have finite impulse response filter.This be disperse, the wave filter implemented of digitizing typically, this wave filter particularly is applied to digitized signal processing field.
The FIR wave filter is characterised in that it has the impulse response of guaranteeing limited length.This means that the FIR wave filter does not depend on the selection of filter parameter, will not become unstable or excite autonomous vibration.The FIR wave filter mostly is a nonrecursive filter, that is to say in its structure, not have feedback or loop (Schleifen).
In order not make independent once stopping working make the filter value distortion, seek the maximum value among all sections time difference Δ ts, and before using said filter value, replace said maximum value with suitable value.The dynamic compensation that calculates has like this improved the calculating of galloping degree signal, and the effect of this improvement when single is flame-out is the most obvious.
For fear of the phase deviation between dynamic compensation and the calculating of galloping degree, calculate the galloping degree that is present in burning in the past in an advantageous manner.Be equivalent to filter width to skew in the past half at this.Therefore in this improvement project, calculate said galloping degree as follows:
lu n = Δ ts n - N 2 - Σ i = 0 N c i · Δ ts n - 1 C · ts n - N 2 - 1 3
Make the filter value distortion because should avoid once flame-out separately, so when implementing this method, will seek all Δ ts N-1Maximum value, and before calculating filter value, utilize suitable value to replace said maximum value.This suitable value for example be by cylinder before and two mean values that Δ ts obtains of afterwards work cycle.
Other advantages of the present invention and improvement project are obtained by specification and accompanying drawing.
It is understandable that characteristic aforesaid and that next also will explain not only can be used with each combination that provides, and can perhaps be used individually, and do not exceed scope of the present invention with other combination.
Description of drawings
Change curve Fig. 1 section of showing time difference, affiliated filter value and galloping degree signal,
Fig. 2 wherein comes the maximum value of substituted segment time difference according to change curve Fig. 1 section of showing time difference, affiliated filter value and galloping degree signal through suitable value,
Fig. 3 schematically shows the described a kind of mode of execution that is used to implement the method introduced,
Fig. 4 has illustrated a kind of of said method in a flow chart maybe flow process.
Embodiment
The present invention is schematically illustrated in the accompanying drawings by mode of execution, and next is described in detail with reference to accompanying drawing.
In Fig. 1, described the change curve of value of said period time difference 12 about burning number of times (abscissa 10).Said in addition diagrammatic sketch also shows the affiliated change curve of signal 14, and it obtains through utilizing the FIR low-pass filter that the said period time difference 12 carried out filtering.This section time difference 12 has been represented the degree of the fluctuation of speed.Calculate said galloping degree signal thus, its change curve is represented with reference character 16.
Reference character 18 has been represented twice independent stopping working, and they are the precipitous rising of the change curve of the section of causing time difference 12 respectively.Make signal 14 produce distortion thus, this distortion is by reference character 20 expressions.Because said distortion 20, negative deviation 22 at first appeared in the galloping degree signal 16 before it raises precipitously, and this shows and has taken place flame-out 18.
Change curve corresponding to the section time difference 12 of Fig. 1 has been shown among Fig. 2.Through a suitable value, for example through the maximum value of determined value replacement in section time differences 12 change curve of averaging shown in reference character 24, make in through the signal 32 that is filtered generation the section time difference 12, not cause filtering distortion (reference character 30).In the variation of said galloping degree signal 34, can not produce negative deviation, and can make signal strengthen about 25% at 38 places at 36 places.
Here said signal is strengthened according to circumstances different and different.This value approximately is 25% in this exemplary situation.
The flame-out of internal-combustion engine can be discerned reliably through this method, thereby adequate measures can be taked where necessary.
Adequate measures for example can be to utilize the signal alerting driver that for this reason is provided with.Also can write in the entry data memory in addition, and during resting on the workshop, said data storage is read and analyzes what stop working.If seem necessary in addition, these measures also can cause closing of motor.
In Fig. 3, described a kind of device that is used to implement this method with diagram schematic, that extremely simplify, it does as a whole by reference character 50 expressions.
Saidly be used to discern internal-combustion engine 52 flame-out devices 50 and have first module 54, utilize said first module to try to achieve the section time difference of internal-combustion engine 52.Be provided with in addition to tried to achieve the section time difference in other words the change curve of this difference carry out the FIR low-pass filter 56 of lower pass-filter and second unit 58 that galloping degree signal is calculated.Also can stipulate at this; At said device 50, for example in first module 54, second unit 58 or another one unit, seek the maximum value that is used for all sections time difference, and before calculating filter value through being carried out lower pass-filter the section time difference with suitable this maximum value of value replacement.
Parts shown in the said device 50 can be designed to structure member disconnected from each other or be integrated in unique module.A kind of embodiment also can be imagined in self-evident ground, and some on this embodiment in all parts or all parts realize in software.
In addition, said device 50 can link to each other with the data storage (not shown), in said data storage, can write to be used to discern flame-out information.This data storage also can be integrated in the common module with miscellaneous part.Perhaps can from this data storage, read data when needed, thereby can be used for the diagnosis of the Functional Capability of internal-combustion engine with the interval of rule.
Fig. 4 shows a kind of possible flow process of the method for being introduced in a flowchart.
In first step 100, obtain a plurality of periods time differences, with offset value calculation on its basis.In following step 102, from the section time difference of trying to achieve, select maximum value.This value should use suitable value to replace, thereby avoids once the independent flame-out filter value distortion that will calculate that makes.
In order to calculate this suitable value, in step 104, used in this case by cylinder before and the mean value that obtains of two section time differences of afterwards work cycle.The suitable value of in another step 106, passing through then to be calculated replaces determined maximum value.Self-evident ground, the maximum value of a more than section time difference of trying to achieve also can be replaced by a plurality of suitable values.
Next in step 108, utilize low-pass filter that the said section time difference of trying to achieve is carried out filtering under the situation of having considered to replace peaked suitable value, with offset value calculation.
The said offset that calculates is used to the galloping degree signal that is calculated by the fluctuation of speed is carried out dynamic compensation in step 110.The galloping degree of the burning that in improvement project, the past was taken place calculates.
Based on this galloping degree signal, whether identification exists flame-out in step 112.If this situation is just taked adequate measures in step 114.Otherwise just from proceeding with the detection of step 100 beginning.

Claims (8)

1. discern the method for flame-out (18) of internal-combustion engine (52) based on the galloping degree signal (16,34) that calculates by the fluctuation of speed; Wherein implement dynamic compensation to galloping degree signal (16,34) by offset; Wherein, Utilize low-pass filter to filter a plurality of periods time differences (12) in order to calculate said offset, seek the maximum value of all sections time difference (12) and replace said maximum value with suitable value before in calculating filter value (14).
2. method according to claim 1 wherein, utilizes FIR low-pass filter (56) to carry out filtering.
3. method according to claim 1 and 2 wherein, is calculated the galloping degree that occurs in burning in the past.
4. according to each described method in the claim 1 to 3, wherein, by cylinder before and the mean value that obtains of two section time differences (12) of afterwards work cycle as suitable value.
5. according to each described method in the claim 1 to 4, wherein, when identifying flame-out (18), take adequate measures.
6. be used to discern the device of flame-out (18) of internal-combustion engine (52); Especially for implementing according to each described method in the claim 1 to 5, said device has the first module (54) of the section time difference that is used to try to achieve motor (52), the Unit second (58) that is used for the low-pass filter of filtering section time difference (12) and is used for when considering offset, calculating galloping degree signal (16,34).
7. device according to claim 6 wherein, uses FIR low-pass filter (56) as low-pass filter.
8. according to claim 6 or 7 described devices, wherein, first module (54), Unit second (58) and low-pass filter are integrated in the module.
CN201110348763.1A 2010-10-05 2011-09-30 For identifying flame-out method Active CN102536486B (en)

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DE102010042001.8A DE102010042001B4 (en) 2010-10-05 2010-10-05 Procedure for detecting dropouts
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113202626A (en) * 2021-05-24 2021-08-03 东风商用车有限公司 Engine misfire detection method, device, equipment and readable storage medium

Citations (6)

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Publication number Priority date Publication date Assignee Title
US20010018906A1 (en) * 2000-03-03 2001-09-06 Michael Lehner Method for detecting combustion misfires in an internal combustion engine
US6978666B1 (en) * 2004-09-08 2005-12-27 Daimlerchrysler Corporation Automatic calibration method for engine misfire detection system
CN1715859A (en) * 2004-06-30 2006-01-04 现代自动车株式会社 Method and system for determining combustion misfire of an internal combustion engine
CN1796754A (en) * 2004-12-28 2006-07-05 本田技研工业株式会社 Misfire detection system for internal combustion engine
CN101173640A (en) * 2006-10-30 2008-05-07 本田技研工业株式会社 Misfire detecting apparatus for internal combustion engine
JP2010024903A (en) * 2008-07-17 2010-02-04 Honda Motor Co Ltd Misfire detecting device for internal combustion engine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20010018906A1 (en) * 2000-03-03 2001-09-06 Michael Lehner Method for detecting combustion misfires in an internal combustion engine
CN1715859A (en) * 2004-06-30 2006-01-04 现代自动车株式会社 Method and system for determining combustion misfire of an internal combustion engine
US6978666B1 (en) * 2004-09-08 2005-12-27 Daimlerchrysler Corporation Automatic calibration method for engine misfire detection system
CN1796754A (en) * 2004-12-28 2006-07-05 本田技研工业株式会社 Misfire detection system for internal combustion engine
CN101173640A (en) * 2006-10-30 2008-05-07 本田技研工业株式会社 Misfire detecting apparatus for internal combustion engine
JP2010024903A (en) * 2008-07-17 2010-02-04 Honda Motor Co Ltd Misfire detecting device for internal combustion engine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113202626A (en) * 2021-05-24 2021-08-03 东风商用车有限公司 Engine misfire detection method, device, equipment and readable storage medium

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