CN101737179A - Method and device for controlling internal combustion engine - Google Patents
Method and device for controlling internal combustion engine Download PDFInfo
- Publication number
- CN101737179A CN101737179A CN200910221045A CN200910221045A CN101737179A CN 101737179 A CN101737179 A CN 101737179A CN 200910221045 A CN200910221045 A CN 200910221045A CN 200910221045 A CN200910221045 A CN 200910221045A CN 101737179 A CN101737179 A CN 101737179A
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- cylinder
- combustion engine
- control time
- cylinders
- parameter
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 21
- 238000001914 filtration Methods 0.000 claims abstract description 7
- 238000010304 firing Methods 0.000 claims description 4
- 239000000446 fuel Substances 0.000 description 14
- 239000003921 oil Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
Images
Classifications
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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
- F02D41/008—Controlling each cylinder individually
- F02D41/0085—Balancing of cylinder outputs, e.g. speed, torque or air-fuel ratio
-
- 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
- F02D41/0097—Electrical control of supply of combustible mixture or its constituents using means for generating speed signals
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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
- F02D41/14—Introducing closed-loop corrections
- F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
- F02D2041/1413—Controller structures or design
- F02D2041/1432—Controller structures or design the system including a filter, e.g. a low pass or high pass filter
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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)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
The present invention describes a method and a device for controlling an internal combustion engine, and characteristics of each air cylinder can be obtained through revolution speed signals of frequency selection filtering. Parameters of at least two air cylinders in the internal combustion engine are changed and adjusted, and proportioning error of the at least one air cylinder is identified according to the changing of the characteristics of each air cylinder.
Description
Technical field
The present invention relates to a kind of as the described method and apparatus that is used for controlling combustion engine of independent claims.
Background technique
By DE 19527218 known a kind of method and apparatus that are used to regulate the tranquil running of internal-combustion engine.Be formed for the theoretical value and the actual value of the peculiar adjusting of cylinder by the tach signal of filtering.The distinctive adjusting of cylinder makes the corresponding fuel quantity of each cylinder be adjusted to its corresponding theory value then.
Usually regulate adjusting air-fuel ratio like this by λ in the fast burn engine of homogeneous operation, the mean value that makes all cylinders is λ value 1 and the low waste gas operation that therefore can realize having ternary catalyzing unit.The distinctive charge of air of dosage sum of errors cylinder of injection valve is poor, and they for example cause owing to systematic error, may cause different λ values in each cylinder, although the whole λ on all cylinders are numerical value 1.This equilibrating of the distinctive λ value of cylinder directly causes fuel consumption to increase.If equilibrating surpasses given threshold value, then may make the discharge value variation.
Waste gas legislation, especially in U.S.'s regulation, this exhaust of essential identification worsens or by suitable adjusting strategy adjustment.
In order to address this problem the different measure that proposes.Can stipulate that on the one hand cylinder peculiarly obtains the λ value and cylinder is peculiarly regulated separately.Need cylinder peculiarly to obtain the λ signal for this reason.The distinctive λ value of this cylinder detects and takes a lot of trouble, because need lambda probe is set or differentiate the λ signal so in time each cylinder, makes that each cylinder can be different.This means, can only carry out this method with very high expense.
Measure according to DE 19527218 can not realize in some running state and for the internal-combustion engine of some type, because especially improve power and do not improve torque contribution at the homogeneous Fu Buhui that increases for external source igniting internal combustion engine mixture in service, that is, can not discern all errors for these internal-combustion engines.
Known method is too bothersome or be not that total energy is used.
Summary of the invention
Therefore the objective of the invention is, provide a kind of method and apparatus, be not subjected to engine geometry parameter or operating mode restrictedly can correspondingly obtain correction value, that is, can discern the uneven distribution of cylinder with enough precision by it with low expense.
Have the feature of independent claims according to device of the present invention with according to method of the present invention, advantage compared with prior art is, realizes high-precision dosage of fuel, wherein can realize this point with low expense.Especially this method can and be used in all internal-combustion engines in all running statees and all operation form.
According to the present invention regulation, obtain the distinctive feature of each cylinder by the tach signal of frequency-selective filtering.At least two cylinders for internal-combustion engine change the adjustment parameter.Obtain to adjust this variation of parameter and change the dosage error of the effect of the distinctive feature of cylinder being discerned at least one cylinder to the effect of the distinctive feature of cylinder with by adjusting parameter.
Frequency-selective filtering by tach signal obtains the distinctive feature of cylinder, very accurately is characterized in the λ error of the torque, dosage error or each cylinder that discharge in each cylinder.
Existing the control time when shortening the control time shortens to the danger that no longer can burn, because spray fuel quantity very little.Therefore advantageously, shorten the control time,, reduce the danger of interrupting burning here because the effect for feature is enough big at least two cylinders.
Following as adjusting the parameter notion in use control time.Control time of this sparger as adjusting parameter.The expression term in sparger control time only is regarded as exemplary below.Replace this to express term and also can use other parameter, as control signal, fuel quantity.
Stipulating that in preferred expansion structure shortens the control time of the sparger of at least two the insides, firing chamber that inject fuel into cylinder, that is, reducing will injected fuel quantity.In simple embodiment, stipulate, only reduce and want injected fuel quantity for two cylinders.But also advantageously in a plurality of cylinders, carry out this point.But, it is important in this that, not at all cylinders but only execution minimizing in partial cylinders.
Particularly advantageous is to increase the control time at least one cylinder.Can guarantee that thus total λ and the total torque that provides keep constant.Avoid thus, the driver recognizes the execution check according to the ride characteristic of internal-combustion engine.This means that the control time by prolonging another cylinder carries out check like this, discharging is not changed and make the driver not feel the variation of ride characteristic.
Can realize any balanced mode of sparger control according to the present invention, that is, can shorten the control time and can increase the control time for the cylinder of any amount for the cylinder of any amount.Because improve but also essential the minimizing, not for all cylinders minimizing discharge times and be not to increase the control time for all cylinders in compulsory mode for the cylinder of some is not only essential.Verified particularly advantageous is to reduce the control time or increase the control time for two cylinders for a cylinder.
Description of drawings
Embodiments of the invention shown in the drawings and explanation in detail in the following description.In the accompanying drawing:
Fig. 1 illustrates skeleton diagram, and it illustrates the primary component according to device of the present invention,
Fig. 2 illustrates flow chart, is used to show according to working principle of the present invention.
Embodiment
The primary component of combustion engine control shown in Figure 1.With 100 expression control units.This unit is to adjust the different adjustment element of parameter control.Especially control sparger 101,102,103 and 104.On this external bent axle or sectional wheel 120 or increment wheel 120 is set on camshaft, it is by sensor 125 scannings.The signal of this sensor arrives first wave filter 210, second wave filter 220 and the 3rd wave filter 230.The output signal of wave filter arrives evaluation unit 150 again, and it controls sparger 101 to 104 again.
Shown number of cylinders is exemplary.Also can in other number of cylinders, use according to working principle of the present invention.
Calculate each cylinder distinctive (at each single cylinder) feature based on this frequency filtering signal evaluation unit 150.Evaluation unit is corresponding to the working principle of describing in DE 19527218 in simple embodiment.Feature is corresponding to the theoretical value of calculating there that is used for each regulator in this simple embodiment.
The distinctive feature of this cylinder with by the given engine torque of corresponding cylinder or relevant with the λ value of respective cylinder, this means that provide a feature for using for each cylinder, it characterizes the contribution of each cylinder for total torque.These numerical value adopt identical numerical value or only have small difference each other in error free and trouble-free internal-combustion engine.If the torque that cylinder contributes is lower, corresponding feature departs from this numerical value, and for example feature adopts littler numerical value.For example this situation is that to a more oil-poor mixture of cylinder conveying, that is, the λ value is greater than 1.These deviations can detect easily.And if a cylinder has λ value＞1, that is, and to this cylinder delivery ratio remaining cylinders mixture of rich oil more, this causes in that homogeneous is in service thus, and torque departs from other cylinder only inessentially, promptly, although significant error occurs, this influences corresponding feature minutely.
In Fig. 2, embodiment according to the inventive method is shown with flow chart.
Therefore according to the present invention's regulation, on purpose make the mutual balance of control signal of each cylinder at first step 300.This point preferably realizes like this, makes at least one cylinder oil-poor, that is, and and to cylinder conveying fuel quantity still less.This point may work thus, the control time is shortened for corresponding cylinder or diminishes.Particularly advantageous is that the control time is shortened with a definite value.This value that control time is shortened is selected greatly like this, makes and can discern by means of feature.Select this value so little on the other hand, make assurance to burn.
In step 310, make at least one cylinder rich oil in addition in a preferred embodiment, that is, at least one cylinder is carried bigger fuel quantity, that is, increase the control time.At this fuel quantity of selecting like this this increasing, make on all cylinders whole λ with reduce before λ compare and keep constant.The prolongation in control time also can realize like this, makes the total amount in all cylinders keep constant.
Additionally stipulate according to the present invention in the internal-combustion engine of source point fire outside, make firing angle during carrying out this method, keep constant, because firing angle has influence to the torque of internal-combustion engine equally.
In the step of following 320, obtain the distinctive feature of each cylinder.The distinctive feature of this cylinder is relevant with the engine torque that is discharged by corresponding cylinder, this means, obtains feature for each cylinder, and it characterizes the contribution of each cylinder for total torque.
These numerical value adopt identical numerical value respectively or only have small deviation each other in zero deflection and free from error internal-combustion engine.If the torque that cylinder contributes is lower, corresponding feature departs from this numerical value, and for example this feature adopts littler numerical value.Expecting owing to reduce the control time, making the feature littler numerical value of cylinder employing hereto for a cylinder.Which has prolonged the eigenvalue that the cylinder in control time is improved slightly for.
Check in step 330, whether each feature of each cylinder is as changing expectantly.Check in inquiry, whether the respective change in the control time of each cylinder causes the respective change of the feature of each cylinder.
Under failure-free operation, the cylinder that reduces the control time must cause moment correspondingly to reduce, and promptly this feature must correspondingly change.Correspondingly, the moment and the feature of other cylinder in prolongation control time correspondingly change.
If this is the case, and the variation of feature since the variation in control time corresponding to desired value, then identification in step 340, this cylinder that has reduced the control time does not have the dosage error.
If the variation of feature is not because the variation in control time corresponds to desired value, then identification in step 350, this cylinder that reduces the control time has the dosage error.
In first expansion structure, stipulate, after in step 350, recognizing this error is stored in inside the error storage.Also can select or additionally the regulation, this error also is shown to the driver or introduces out other measure.
Stipulate that in second expansion structure calcuating correction value is revised the control time of respective cylinder by it.
Under regard to other cylinder and correspondingly carry out this method, that is, successively shorten control time and check for a cylinder respectively, whether corresponding feature has corresponding reaction simultaneously.
This means, for discern different deviations on purpose each cylinder of balance control time and observe the reaction of individual features.In this balance of selecting cylinder like this, make at least one cylinder oil-poor with emitted dose given in advance.In order to make whole λ keep constant, correspondingly improve emitted dose, promptly at least one cylinder of other cylinder simultaneously, make its rich oil.
Oil-poor and rich oil when different balanced modes also can be stipulated difference cylinder in an expansion structure.For example can make two cylinder rich oils for five cylinders, and make its excess-three cylinder oil-poor.Importantly, select balanced mode like this, make each cylinder at least once oil-poor.This means that the reaction that is changed by each and the reaction of cylinder characteristic feature obtain the dosage error of each cylinder in cylinder control time.
In a particularly advantageous embodiment, precheck, whether exist the danger of when reducing the control time, no longer burning.Regulation checked whether the feature of one or more cylinders demonstrates too low dosage signal before reducing the control time in another step for this reason.If the dosage signal that demonstrates is obviously too low, then this cylinder demonstrates too high λ signal.If the dosage signal that demonstrates is only slightly too little, then store this signal and consideration when calculating the variation of adjustment parameter.
If feature demonstrates, the obvious fuel very little of one or more cylinder injections, then its control time is preferably in when continuing to check and does not reduce.Shorten the control time for having recognized in advance the obvious cylinder of fuel quantity very little of injection not according to said method.Can prevent that thus the control time from shortening to the no longer numerical value of burning.
Claims (9)
1. method that is used for controlling combustion engine, wherein the tach signal by frequency-selective filtering obtains the distinctive feature of each cylinder, and wherein at least two cylinders for internal-combustion engine change the dosage error of adjusting parameter and being discerned at least one cylinder by the distinctive changing features of each cylinder.
2. the method for claim 1 is characterized in that, reduces at least one cylinder and adjusts parameter.
3. method as claimed in claim 2 is characterized in that, improves the adjustment parameter of another cylinder at least when reducing the adjustment parameter of at least one cylinder.
4. as each described method in the above-mentioned claim 1 to 3, it is characterized in that, as the control time of adjusting the parameter change sparger.
5. as each described method in the above-mentioned claim 1 to 3, it is characterized in that, realize like this improving, make the dosage total amount of all cylinders keep identical and/or make the λ value keep identical.
6. as each described method in the above-mentioned claim 1 to 3, it is characterized in that the distinctive feature of each cylinder, the torque that discharges characterize dosage error or λ error in cylinder.
7. as each described method in the above-mentioned claim 1 to 3, it is characterized in that, make firing angle keep constant.
8. as each described method in the above-mentioned claim 1 to 3, it is characterized in that whether pretesting exists the danger of no longer burning when reducing the control time.
9. device that is used for controlling combustion engine, have the mechanism that is obtained the distinctive feature of each cylinder by the tach signal of frequency-selective filtering, at least two cylinders that have for internal-combustion engine change the mechanism that adjusts parameter and discerned the dosage error of at least one cylinder by the variation of the distinctive feature of each cylinder.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102008043599.6 | 2008-11-10 | ||
| DE200810043599 DE102008043599A1 (en) | 2008-11-10 | 2008-11-10 | Method for controlling internal-combustion engine, involves determining cylinder-individual characteristic by frequency-selective filtered rotational speed signal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101737179A true CN101737179A (en) | 2010-06-16 |
Family
ID=42096210
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910221045A Pending CN101737179A (en) | 2008-11-10 | 2009-11-09 | Method and device for controlling internal combustion engine |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN101737179A (en) |
| DE (1) | DE102008043599A1 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19527218B4 (en) | 1994-12-23 | 2004-03-18 | Robert Bosch Gmbh | Method and device for regulating the smooth running of an internal combustion engine |
-
2008
- 2008-11-10 DE DE200810043599 patent/DE102008043599A1/en not_active Withdrawn
-
2009
- 2009-11-09 CN CN200910221045A patent/CN101737179A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE102008043599A1 (en) | 2010-05-12 |
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Application publication date: 20100616 |