CN101614144A - The method and apparatus of the crankcase ventilation of disgnosizing internal combustion engine - Google Patents
The method and apparatus of the crankcase ventilation of disgnosizing internal combustion engine Download PDFInfo
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- CN101614144A CN101614144A CN200910146290A CN200910146290A CN101614144A CN 101614144 A CN101614144 A CN 101614144A CN 200910146290 A CN200910146290 A CN 200910146290A CN 200910146290 A CN200910146290 A CN 200910146290A CN 101614144 A CN101614144 A CN 101614144A
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- engine
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- 238000009423 ventilation Methods 0.000 title claims abstract description 74
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000007789 gas Substances 0.000 claims description 28
- 238000012937 correction Methods 0.000 claims description 11
- 238000001514 detection method Methods 0.000 claims description 11
- 230000010354 integration Effects 0.000 claims description 7
- 239000002912 waste gas Substances 0.000 claims description 6
- 239000000523 sample Substances 0.000 claims description 4
- 238000004590 computer program Methods 0.000 claims description 2
- 238000012545 processing Methods 0.000 claims description 2
- 239000003570 air Substances 0.000 description 62
- 239000003921 oil Substances 0.000 description 14
- 238000003745 diagnosis Methods 0.000 description 10
- 150000002430 hydrocarbons Chemical class 0.000 description 8
- 229930195733 hydrocarbon Natural products 0.000 description 6
- 239000003595 mist Substances 0.000 description 6
- 239000004215 Carbon black (E152) Substances 0.000 description 5
- 238000002405 diagnostic procedure Methods 0.000 description 4
- 230000003044 adaptive effect Effects 0.000 description 3
- 238000010304 firing Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000011144 upstream manufacturing Methods 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 239000000567 combustion gas Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000002828 fuel tank Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M13/00—Crankcase ventilating or breathing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M13/00—Crankcase ventilating or breathing
- F01M13/02—Crankcase ventilating or breathing by means of additional source of positive or negative pressure
- F01M13/021—Crankcase ventilating or breathing by means of additional source of positive or negative pressure of negative pressure
- F01M13/022—Crankcase ventilating or breathing by means of additional source of positive or negative pressure of negative pressure using engine inlet suction
-
- 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
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/003—Adding fuel vapours, e.g. drawn from engine fuel reservoir
-
- 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
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D41/221—Safety or indicating devices for abnormal conditions relating to the failure of actuators or electrically driven elements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M13/00—Crankcase ventilating or breathing
- F01M13/02—Crankcase ventilating or breathing by means of additional source of positive or negative pressure
- F01M13/021—Crankcase ventilating or breathing by means of additional source of positive or negative pressure of negative pressure
- F01M13/022—Crankcase ventilating or breathing by means of additional source of positive or negative pressure of negative pressure using engine inlet suction
- F01M13/023—Control valves in suction conduit
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M13/00—Crankcase ventilating or breathing
- F01M2013/0005—Crankcase ventilating or breathing with systems regulating the pressure in the carter
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M13/00—Crankcase ventilating or breathing
- F01M13/0011—Breather valves
- F01M2013/0022—Breather valves electromagnetic
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M13/00—Crankcase ventilating or breathing
- F01M13/04—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil
- F01M2013/0422—Separating oil and gas with a centrifuge device
- F01M2013/0427—Separating oil and gas with a centrifuge device the centrifuge device having no rotating part, e.g. cyclone
-
- 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
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
- F02D41/1454—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an oxygen content or concentration or the air-fuel ratio
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
Abstract
The present invention relates to a kind of method and apparatus of crankcase ventilation of disgnosizing internal combustion engine.The present invention relates to a kind of method of function of the crankcase ventilation system that is used to detect engine system, have following step: interrupt at the crankcase of internal-combustion engine and the ventilation duct between the air system detecting duration with internal-combustion engine; Determine variation in the Operational Limits that detects the duration internal-combustion engine; Determine the fault of crankcase ventilation system by the variation of fixed Operational Limits.
Description
Technical field
The present invention relates to the crankcase ventilation of internal-combustion engine, particularly relate to a kind of method and apparatus that can be used for diagnosing the function of crankcase ventilation.
Background technique
If there is not venting practice when internal combustion engine operation, in crankcase, can form the pressure higher than atmosphere.This pressure mainly is because combustion gas overflow (gas blowby) and form mist of oil caused from the firing chamber.This high pressure in the crankcase, usually crankcase and air system are coupled together by oil separator by one or more ventilation duct, this like this mixed gas is transported in the burning in the cylinder by gas handling system, and can not arrive in the atmosphere environment.
Usually ventilation duct had both led in the zone of air system of closure upstream, also led in (downstream of closure) in the suction tude.During in the assembled engines system or in work such as repairings because for example because vibration comes off or forgets maintenance work after and plug ventilation duct again, make between oil separator and the air system the ventilation duct interruption and break down.This can cause the leakage of air system and waste gas from the crankcase scavenged to the ambient air in.Though the leakage of gas handling system can be diagnosed by suitable method, but but can not determine whether be since ventilation duct unclamp the leakage that causes gas handling system, that is to say that the diagnostic method that uses usually so far can not leak with other suction tude be distinguished.
Another source of trouble is the obstruction of ventilation duct.This obstruction for example may be because the icing or sediments in the ventilation duct is caused.For example its possibility of result of the obstruction of the ventilation duct between oil separating device and air system is the pressure increase in the crankcase, and this increase of pressure may cause leaking.Particularly the pressure in the crankcase increases owing to extrude dipstick and for example causes leakage.Hydrocarbon can arrive the atmosphere environment from crankcase like this.
Summary of the invention
Task of the present invention provides the method and apparatus of the functional fault that detects the crankcase ventilation in the internal-combustion engine.
This task is by being accomplished according to independent claims 1 described method with according to the described engine system of independent claims arranged side by side.
In the dependent claims other favourable schemes of the present invention are illustrated.
According to a first aspect of the invention, propose to be used to detect the method for function of the crankcase ventilation system of engine system with internal-combustion engine.This method comprises the steps:
-detecting the duration interruption at the crankcase of internal-combustion engine and the ventilation duct between the air system;
-determine variation in the Operational Limits that detects the duration internal-combustion engine;
-determine the fault of crankcase ventilation system by the variation of described fixed Operational Limits.
Design of the present invention is by the crankcase that interrupts internal-combustion engine in short-term and the ventilation duct between the air system with by the monitoring to Operational Limits, determines whether vent systems has fault.
Can stipulate that for this reason described Operational Limits comprises the excess air coefficient value (Lambda value) of the waste gas of internal-combustion engine.Like this, for example just can determine fault in the crankcase ventilation system by the variation of analyzing the excess air coefficient value.
Also can stipulate in addition, in engine system, be provided with excess air coefficient control, wherein, when detecting the function of crankcase ventilation system, excess air coefficient control be closed at the detection duration.Avoid getting involved and replace the detection of interrupting crankcase ventilation by this measure because the intervention of excess air coefficient control does not change the excess air coefficient value.
The time durations that ventilation duct between crankcase and air system interrupts, excess air coefficient value (weaken) toward the direction to change and surpass the threshold value of determining, this is because the ventilation duct between crankcase and air system is normal.Its reason is to have introduced hydrocarbon by the outlet pipe between crankcase and the air system from crankcase.These hydrocarbons have been taken into account when mixed gas is adaptive.That is to say that the excess air coefficient of engine system is regulated and considered by crankcase ventilation and be incorporated into hydrocarbon part in the air system.
If now the ventilation duct between crankcase and the air system has interrupted, then the introducing of hydrocarbon has not just had, and take place mixture towards thin change.This thin change can detect by the probe of the excess air coefficient in the gas exhaust manifold of internal-combustion engine.If the valve in the ventilation duct reopens, then mixed gas changes towards rich oil similarly.If can not determine out this thin change, then can draw out of order conclusion.
Particularly can determine the variation of Operational Limits, promptly by the difference between the rating value of Operational Limits and Operational Limits is defined as the difference parameter value, and during detection time, this difference parameter value is carried out integration, wherein, the difference parameter value of integration detects by carrying out threshold ratio with the threshold value of regulation, wherein, determine the functional fault of crankcase ventilation system according to the comparative result of threshold value.
According to a kind of mode of execution, detect at the time point of predesignating or according to regular time intervals, particularly carry out one-time detection at least at the run duration of internal-combustion engine.
Also can stipulate in addition, detect according to the operating temperature of internal-combustion engine.
According to a kind of mode of execution, obtain the mixed gas correction value that adds up, the additional emitted dose of this correction value regulation, be additional to by the determined air quantity of the closure of internal-combustion engine with compensation, wherein, during fault in determining crankcase ventilation system, determine fault type according to the mixed gas correction value that adds up.
A kind of engine system that is used to detect the function of crankcase ventilation system is proposed according to a further aspect in the invention.This engine system comprises:
-have an internal-combustion engine of crankcase and air system;
-ventilation duct, this ventilation duct interconnects crankcase and air system;
-stop valve, this stop valve is arranged in the ventilation duct, to interrupt ventilation duct;
-control gear is used for
-detecting duration interruption ventilation duct;
-determine the variation of the Operational Limits of internal-combustion engine detecting duration; And
-determine fault in the crankcase ventilation system by the variation of fixed Operational Limits.
In addition, also can the by-pass line with excess pressure valve be set in parallel, be used for when stop valve is closed the overvoltage of crankcase is discharged in the air system with stop valve.
Propose a kind of computer program according to a further aspect in the invention, this program comprises program-code, when its at data processing unit, can implement said method when particularly on control gear, being performed.
Description of drawings
Preferred embodiment be described in more details of the present invention by accompanying drawing below.These accompanying drawings are:
Fig. 1: the sketch of engine system, the functional fault of diagnosable crankcase ventilation in this engine system.
Fig. 2: the flow chart that is used to diagnose the method for crankcase ventilation.
Embodiment
Fig. 1 sketch illustrates engine system 1.Internal-combustion engine 2 with cylinder 4 and crankcase 3 has been shown in this engine system.Has the only internal-combustion engine 2 of a cylinder 4 in order to illustrate for the purpose of obviously.Cylinder 4 provides air by air system 5.Air is to enter into corresponding cylinder 4 by suction valve 6.Gas of combustion can be discharged into the gas exhaust manifold 8 from cylinder 4 by outlet valve 7.Excess air coefficient probe 9 is set in gas exhaust manifold 8, detecting the mixed gas composition of spent air, and provides the data of relevant excess air coefficient value.Fuel oil or directly or indirectly be transported to cylinder 4 by air system 5.
Air system 5 comprises suction tude 10 and closure 11, so that the air inflow of cylinder 4 is regulated.Suction tude 10 is arranged between closure 11 and the suction valve 6.In addition, the part of air input pipeline 14 as the air system 5 of internal-combustion engine is set in the upstream of closure 11.Air quality detector 13 is set in air input pipeline 14, and this detector detects the air quantity that flows through air input pipeline 14.
Control gear 12 is set in addition.It receives the data of relevant excess air coefficient value from excess air coefficient value probe 9, and receive the data of relevant air mass flow from air quality detector 13, and closure 11, emitted dose etc. are regulated (referring to dotted line) according to engine controller.
When internal-combustion engine 2 operation owing to occur pressure from gathering of the combustion gas of firing chamber in the crankcase 3 with being formed on of mist of oil and improve, the raising of this pressure reacts on the working stroke of the piston in cylinder on the one hand, and can cause crankcase 3 blow-by on the other hand, for example because dipstick is extruded.Hydrocarbon and mist of oil may reach internal-combustion engine 2 external worlds like this.
Be provided with crankcase ventilation for fear of form the pressure that increases in crankcase 3, it has ventilation duct 15.This ventilation duct 15 is connected with crankcase 3 by the oil separating device 16 that for example is the cyclone separator form.Oil separating device 16 mist of oil that will flow out from crankcase 3 forms eddy flow in this case, and like this, oil droplet and is back in the crankcase 3 by feedback pipeline 17 under deposition on the internal surface of oil separator 16.Only discharge from that part of gaseous state of the gas of crankcase 3 discharges by ventilation duct 15 like this.
Ventilation duct 15 is provided with stop valve 18, and leads in the air system 5 two feeding positions.First feeds the upstream that position 19 is positioned at closure 11, and second feeds the downstream that position 20 is positioned at closure 11.Stop valve 18 is controlled by control gear 12.Also optionally the position feedback of stop valve 18 is transferred to control gear 12, so just can detects stop valve 18 and whether play a role according to the rules according to the control of control gear 12.When determine that stop valve 18 is then exportable when not responding, transmission or storage be about the corresponding data of the fault in the ventilation system of engine system.Particularly can so construct stop valve 18, promptly when stop valve is uncontrolled, it mechanically is transformed into the state of opening, stop valve 18 is not to be in for a long time to close just when nonserviceabling like this.
Control gear 12 is carried out the method for the normal function of diagnosis crankcase ventilation by stop valve 18.There is shown the mode of execution of this method in the flow process of Fig. 2.
At first whether control gear 12 detection internal-combustion engines 2 reach definite operating temperature in step S1.For this reason, one or more temperature data (not shown) is provided for control gear 12 by suitable Temperature Detector.Only reach or just have the stable behavior that is used for reliable diagnosis when surpassing the operating temperature of internal-combustion engine 2.Especially formed mist of oil in crankcase, it is the hydrocarbon part or the combustion parts (lack of air) of prerequisite that this mist of oil includes for diagnosis.
When determining to reach operating temperature (selecting: be), then detect (step S2) and whether tackle crankcase ventilation and diagnose.Diagnosis to crankcase ventilation can be carried out or carry out at the scheduled time point regularly.Preferably the diagnosis of crankcase ventilation is carried out once when the internal-combustion engine each run at least.
When carrying out crankcase ventilation when diagnosis (selecting: be), in step S3, detect, whether internal-combustion engine 2 is in low load operation at present, and under the constant situation of invariablenes turning speed or load moment, that is to say in the stable operation behavior and move.This is relatively determining by the load moment threshold value of load moment and regulation.In addition, can determine by the threshold detection of load moment or change in rotational speed whether firing chamber 2 is among the steady operational status.
Have only when having determined (selecting: be) low load operation and stable running state (as the prerequisite of obvious introducing from the gas of crankcase), can detect at next step S4, fuel tank ventilation valve is closed (end) and the waste gas feedback is all closed.The purpose of doing like this is by the possible interference effect of this measure eliminating to diagnosis.Have only when situation and (select: be) just to begin the real diagnosis of crankcase ventilation when also being such with step S5.If the fruit situation is not like this, then turns back to step S3 and (select: not).
In step S5, close stop valve 18 in short-term, and obtain in the meantime by the pop one's head in deviation of 9 detected excess air coefficient values of excess air coefficient by control unit 12.Stop valve 18 was closed 0.1 to 1 second, preferably closed about 0.5 second.Closing the control of stop valve 18 pause (correction) excess air coefficient, deexcitation just, wherein, described excess air coefficient control example detects the excess air coefficient value in the down periods continuously or periodically as also realizing in control unit 12.In 18 down periods of stop valve, the excess air coefficient value difference value that produces is carried out integration from the excess air coefficient value that records and the difference between the specified excess air coefficient value.
If reaching threshold value in the down periods of stop valve 18 as integral value, (according to step S6) (do not select: not), then have the fault of crankcase ventilation system.If surpass threshold value, then crankcase ventilation does not have fault (selecting: be), and turns back to step S2, determines when should carry out new diagnosis process in this step.
Can suitable manner show, store the crankcase ventilation system fault, perhaps it is transferred to the position of regulation.
If the excess air coefficient value difference value of integration does not reach threshold value, may be that ventilation duct interrupts so, or the connection that feeds between position 19,20 and the crankcase 3 be interrupted.Under normal circumstances be contemplated that, under the adaptive situation of the mixed gas of beginning-the adaptive normal hydrocarbon introducing amount that also compensates crankcase ventilation of this mixed gas, even and also further do not change-when stop valve 18 is closed, occur relative thin closing excess air coefficient when control, this thin integral value that improved, and therefore surpass the threshold value of stipulating.Integral value no longer changes after reopening stop valve 18, and turns back to (for example step S2) before new diagnostic procedure.
Therefore the time lag of diagnostic procedure should keep as much as possible little, with can not be owing to current diagnosis is abandoned and repeated to disturbances of power.In addition, should reduce because interference effect as because waste gas feeds back or the fuel tank exhaust causes the possibility of interruption, is controlled the possible adverse influence that causes and minimized so that close excess air coefficient.On the other hand for the reliable result of diagnostic procedure, essential minimum Diagnostic Time.
Because the excess air coefficient value difference value of integration does not reach under the situation of the determined fault of threshold value, distinguish between can and leaking in the obstruction of ventilation duct 15.This in this step, obtains the size of the mixed gas adaptation value that adds up that has up to the present reached optionally carrying out among the step S7.This mixed gas adaptation value that adds up is very important for the range of operation near idle running.When in identifying suction tude air leakage being arranged, the mixed gas correction that adds up uprises because thus the air fuel ratio of caused raising by by add up, for example improved motor that the mixed gas correction that sprays into amount of fuel carried out and regulate and obtain balance.Determine (step S9 selects: be) in this case, ventilation duct no longer is connected with air system 5.When the mixed gas correction value that adds up is low, just when another mixed gas correction threshold of lower substantially regulation is following, can draw conclusion (the step S10: select: not) that crankcase ventilation is stopped up.Can in step S8, be presented in the unshowned display unit, be stored in the (not shown) fault memorizer, perhaps be transferred in the position that for this reason is provided with the fault of suitable manner with two types.
For when fault is arranged-that this moment, stop valve 18 kept time of closing was oversize-engine operation can not occur to disturb, then can the by-pass line with excess pressure valve be set in parallel with stop valve, like this, those may cause the impaired pressure of motor to be directed in the air system by this excess pressure valve.Particularly should so construct this excess pressure valve, promptly the pressure in crankcase was just opened it greatly before dipstick is extruded.
Claims (11)
1. be used for detecting the method for function of the crankcase ventilation system of engine system (1), have following step with internal-combustion engine (2):
-detecting duration interruption (S5) at the crankcase (3) of internal-combustion engine (2) and the ventilation duct (15) between the air system (5);
-determine variation in the Operational Limits that detects duration internal-combustion engine (2);
-determine the fault of (S6) crankcase ventilation system by the variation of fixed Operational Limits.
2. in accordance with the method for claim 1, wherein, described Operational Limits comprises the excess air coefficient value of the waste gas of internal-combustion engine (2).
3. according to claim 1 or 2 described methods, wherein, by the difference between the rating value of described Operational Limits and Operational Limits is defined as the difference parameter value, and by described difference parameter value being carried out integration at the detection duration, determine the variation of described Operational Limits, the difference parameter value of wherein said integration is tested by carrying out threshold ratio with the threshold value of regulation, wherein determines the functional fault of crankcase ventilation system according to described threshold ratio result.
4. according to each described method in the claim 1 to 3, wherein, described detection is carried out at the time point of predesignating or according to regular time intervals, particularly carries out one-time detection at least during an operation phase of internal-combustion engine (2).
5. according to each described method in the claim 1 to 4, wherein, carry out described detection according to the operating temperature of internal-combustion engine (2).
6. according to each described method in the claim 1 to 5, wherein, in engine system (1), be provided with excess air coefficient control, when wherein detecting the function of crankcase ventilation system, excess air coefficient control closed at the detection duration.
7. according to each described method in the claim 1 to 6, wherein, obtain the mixed gas correction value that adds up, the additional emitted dose of this mixed gas correction value regulation, be additional to the determined air quantity of closure (11) with compensation by internal-combustion engine (2), wherein during the fault in determining crankcase ventilation system, determine fault type according to the described mixed gas correction value that adds up.
8. be used to detect the engine system (1) of the function of crankcase ventilation system, comprise:
-have an internal-combustion engine (2) of crankcase (3) and air system;
-ventilation duct (15), this ventilation duct interconnects crankcase and air system;
-stop valve (18), this stop valve are arranged in the described ventilation duct to interrupt ventilation duct;
-control gear is used for
Thereby-control stop valve is detecting duration interruption ventilation duct (15);
-determine variation in the Operational Limits that detects duration internal-combustion engine (2);
-determine fault in the crankcase ventilation system by the fixed variation of described Operational Limits.
9. according to the described engine system of claim 8 (1), wherein be provided with excess air coefficient probe (9) in the gas exhaust manifold (8) of internal-combustion engine (2), wherein said Operational Limits comprises the excess air coefficient value of the waste gas of internal-combustion engine (2).
10. according to claim 8 or 9 described engine systems (1), wherein be provided with by-pass line in parallel, be used for when closing the overvoltage of crankcase being discharged in the air system at stop valve (18) with excess pressure valve with described stop valve.
11. comprise the computer program of program-code, when its at data processing unit, when particularly in controller, moving, be used for carrying out according to each described method of claim 1 to 7.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102008002721.9 | 2008-06-27 | ||
| DE200810002721 DE102008002721A1 (en) | 2008-06-27 | 2008-06-27 | Crankcase emission control system operability testing method for engine system, involves detecting error in crankcase emission control system based on determined change of operating parameter of internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101614144A true CN101614144A (en) | 2009-12-30 |
| CN101614144B CN101614144B (en) | 2011-12-28 |
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ID=41360362
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910146290XA Expired - Fee Related CN101614144B (en) | 2008-06-27 | 2009-06-26 | Method and device for diagnosing the ventilation in crankcase of internal combustion engine |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN101614144B (en) |
| DE (1) | DE102008002721A1 (en) |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103097703A (en) * | 2010-09-16 | 2013-05-08 | 罗伯特·博世有限公司 | Method and device for diagnosing crankcase ventilation of internal combustion engines |
| CN103388533A (en) * | 2012-05-08 | 2013-11-13 | 罗伯特·博世有限公司 | A method for diagnosing a valve of a fluid supply line |
| CN103670594A (en) * | 2012-09-14 | 2014-03-26 | 福特环球技术公司 | Crankcase integrity breach detection |
| CN103670596A (en) * | 2012-09-14 | 2014-03-26 | 福特环球技术公司 | Crankcase integrity breach detection |
| CN105484869A (en) * | 2014-10-03 | 2016-04-13 | 福特环球技术公司 | Crankcase integrity breach detection |
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| US5897597A (en) * | 1996-10-28 | 1999-04-27 | General Motors Corporation | Positive crankcase ventilation system diagnostic |
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2008
- 2008-06-27 DE DE200810002721 patent/DE102008002721A1/en not_active Withdrawn
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2009
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Also Published As
| Publication number | Publication date |
|---|---|
| CN101614144B (en) | 2011-12-28 |
| DE102008002721A1 (en) | 2009-12-31 |
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