CN1139723C - Method and systme for starting combustion engines - Google Patents
Method and systme for starting combustion engines Download PDFInfo
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- CN1139723C CN1139723C CNB008068550A CN00806855A CN1139723C CN 1139723 C CN1139723 C CN 1139723C CN B008068550 A CNB008068550 A CN B008068550A CN 00806855 A CN00806855 A CN 00806855A CN 1139723 C CN1139723 C CN 1139723C
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- firing chamber
- fuel ratio
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- combustion engine
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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
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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
- F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
- F02D41/062—Introducing corrections for particular operating conditions for engine starting or warming up for starting
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention relates to a method and system for controlling fuel supply to a combustion engine (1) comprising at least two cylinders (4a to 4d) during a start attempt. Injectors (13) for individual cylinders (4a to 4d) are controlled such that the air-fuel ratio (A/F) obtained varies for each cylinder (4a to 4d) by an amount (DELTA f). The fuel injection to the cylinders (4a to 4d) varies between the leanest air-fuel ratio and the richest airfuel ratio practically feasible during starting. If the engine does not start within a predetermined number of cycles an incremental increase of the fuel supply is initiated for each predetermined number of cycles following thereafter.
Description
Technical field
The present invention relates to a kind of method of starting apparatus combustion engine, and be used to carry out system for carrying out said process.
Background technique
In UK Patent Application GB-A-1567041, a kind of like this method is disclosed, be included in the operation cycle of the beginning that the internal combustion machine starts in a plurality of firing chambers each fuel injector is provided, wherein the first fuel quantity F1 is used in first firing chamber so that have special air fuel mixture ratio A/F1.Second, third etc. the firing chamber have ratio A/F1, the A/F2... of minimizing, the fuel quantity F2, the F3 that are progressively increased gradually reduce.
In addition, in U.S. Patent application US-A-5605138, disclose a kind of method of starting apparatus combustion engine, described the method for the fuel starting apparatus combustion engine that uses other type, wherein set up the fuel quantity of being supplied with from a basic value.According to the variation of internal-combustion engine rotational speed between the starting period, determine whether to proofread and correct the basic value of fueling amount.For example, the fuel quantity of being supplied with can be after per second circulation that igniting does not take place the amount of increasing supply 20%.Can repeat this increasing amount progressively up to internal combustion engine start.
In U.S. Patent application US-A-5579737, another kind of method is disclosed, wherein detect the process of a possible postcombustion.If do not detect the process of any postcombustion, use the fuel correction of in last driving circulation, setting up, if detect postcombustion, fuel correction is reset to default value.
In U.S. Patent application US-A-3982519, the other method that increases fuel during internal combustion engine start is disclosed, wherein between the beginning starting period, apply and be lower than the fuel quantity that the required stoichiometry of burning draws.After this, in the process that starts, apply the fuel quantity that progressively increases.
In U.S. Patent application US-A-4438748, a kind of method that increases fuel supply between the starting period monotonously to internal-combustion engine is disclosed.
In most internal-combustion engine, its fuel may be gasoline, diesel oil, liquid gas or rock gas, and fuel injection system will be suitable for amount and the characteristic that fuel uses.Use is different from formerly uses the fuel of fuel type to come starting apparatus combustion engine, may produce some problems.Under most situation, the fuel that fuel system can be suitable for formerly using, and set up certain correction that is used for fuel supply or adjusted and change.
Dissimilar fuel is corresponding to the mixture of the rock gas with different calorific values or be used for the different gasoline/carbinol mixture of multi-fuel internal combustion engine or have the gasoline of different octane values or cetane number respectively or the mixture of diesel oil or have different volatile gasoline.
Other the solution of carrying out in the system that uses dissimilar fuel to start is to use the fuel tank in the middle of some.On control mode, middle fuel tank and main fuel tank are separated.The purpose of using this middle fuel tank is enough and formerly to use the fuel of (promptly using before shutdown) fuel same type to start.Even internal-combustion engine used before shutdown is pure Fuel Petroleum and has added methanol fuel in main fuel tank, internal-combustion engine still can successfully start.In case internal combustion engine start success, the volume of middle fuel tank can be gradually by with main fuel tank in the fuel of fuel same quality occupied.
Other solution comprises the prober of a fuel quality, but these probers have lower reliability, and can increase the identical expense of fuel considerably.
Increase gradually at the air-fuel mixture of basic " oil-poor " from of prior art that an existing problem is to occur the non-ignitable phenomenon of some before internal-combustion engine successfully starts in all cylinders the supply of fuel quantity.For environmental protection, this is the situation of undesirable appearance, increases because unlit fuel is discharged into the content that causes hydrocarbon in the atmosphere.In addition, also can extend the starting time of internal-combustion engine, and cause battery consumption to increase.The problem in the existing ground of fuel tank is must increase some valves and petrolift are set in the middle of using, so increased identical expense considerably.
Summary of the invention
The system and method that the purpose of this invention is to provide a kind of control fuel supply between the starting period is with problem and the shortcoming of avoiding existing in above-mentioned prior art system and the method.
In order to realize purpose of the present invention, the invention provides a kind of method that between the starting period of internal-combustion engine, is used to control fuel supply with at least two firing chambers, control the air fuel ratio A/F among each described firing chamber 4a...4d by this way, be that the air fuel ratio A/F that each described firing chamber 4a...4d is obtained is different, the air fuel ratio A/F in first firing chamber among the described firing chamber 4a...4d is controlled to be the first air fuel ratio A/F
1Be lower than first air fuel ratio for other the air fuel ratio of each firing chamber in the described firing chamber by first of the step separately predetermined amount Δ f, first detects a firing chamber in described firing chamber 4a...4d after the successfully igniting, controls described firing chamber 4a ... the air fuel ratio A/F of at least one among the 4d in other firing chamber is to equal the air fuel ratio A/F of described first firing chamber substantially
Ideal, when detecting predetermined number of consecutive burning one of in described firing chamber 4a...4d, will detect the igniting of a success.The method according to this invention by to using different air fuel ratios in each firing chamber, can be set up the correct air fuel ratio that is used for successfully starting apparatus combustion engine more apace.Because starting apparatus combustion engine may reduce the electric weight that storage battery consumed between the starting period more quickly.In addition, starting apparatus combustion engine can reduce the reduction of the level of hydrocarbon more quickly.
This method will make the air fuel ratio that obtains being evenly distributed in different firing chambers, so that survey the required correct air fuel ratio of igniting more apace.Preferably, the first predetermined amount equals first air fuel ratio and deducts second air fuel ratio, deducts 1 divided by the quantity of the firing chamber of internal-combustion engine.For example, first air fuel ratio is the highest air fuel ratio that internal-combustion engine is predicted, second air fuel ratio is the minimum air fuel ratio that internal-combustion engine is predicted.In this way, on institute's combuster, cover the air fuel ratio of gamut as far as possible.
In the embodiment of other the method according to this invention, in the cycle period of a predetermined quantity, the air fuel ratio that air fuel ratio is lower than second firing chamber of the air fuel ratio in first firing chamber controls to second amount of being scheduled to that is higher than the air fuel ratio in first firing chamber.This can realize by forced ventilation is carried out in the firing chamber of the air-fuel mixture that initially has overrich.
In other another embodiment, in the cycle period of a predetermined quantity, the air fuel ratio that air fuel ratio is lower than second firing chamber of the air fuel ratio in first firing chamber controls to second amount of being scheduled to that is lower than the air fuel ratio in first firing chamber, to the continuous burning in first firing chamber and do not burn survey after so that determine whether the low slightly air fuel ratio that need be used for successfully lighting a fire.The air fuel ratio that burning that replaces that is detected and incombustible state indicate in this firing chamber is lower than the air fuel ratio that can correctly light a fire to a certain extent, and never the recirculation of Ran Shao the remaining fuel of circulation has caused the state of this alternate combustion.Therefore, this embodiment provides a kind of internal combustion engine start method more reliably.In addition, can determine the described second predetermined amount by the recirculation mode of residual fuel in the firing chamber of described internal-combustion engine.
In another embodiment of the method according to this invention, when the igniting that does not detect success in the cycle period of some, by the 3rd predetermined air fuel ratio of amount change in institute's combuster.In some internal-combustion engines, particularly to use in the internal-combustion engine of rock gas, the scope that is used for correct air fuel ratio of lighting a fire is very narrow.Therefore, can occur in air fuel ratio in the firing chamber and can not cause the state of successfully lighting a fire.In the cycle period of predetermined quantity, cause the air fuel ratio of burning by changing the air fuel ratio in institute's combuster by the 3rd predetermined amount (increase or reduce), can be based upon to have in one of them firing chamber.In the scope of the circulation of described predetermined quantity between 2 and 10, be preferably 4.
In another preferred embodiment of the method according to this invention; this method just just can be implemented after surveying or predicting the state that starts difficulty, and the described state that starts difficulty comprises again the long-time shutdown of the short-time duty or the internal-combustion engine of fueling incident, internal-combustion engine.Under these states, the quality of the fuel that uses or the change of characteristic may appear, so need to implement method of the present invention.In other cases, internal-combustion engine can start under the Set For Current of fuel system fast.
A second aspect of the present invention relates to and is used to control the system that supplies fuel to internal-combustion engine, wherein this internal-combustion engine comprises that at least two firing chambers and at least one single being used to supply fuel to the sparger of each independent firing chamber, this system comprises: the storage device that is used to store following information: supply with a predetermined fuel quantity according to the running state of internal-combustion engine, and the correcting value that during internal combustion engine operation, needs with set up, so that by proofread and correct the optimum efficiency that a predetermined fuel quantity of being supplied with obtains internal-combustion engine according to the running state of internal-combustion engine; Be used for surveying combustion detection device in the burning of arbitrary described firing chamber; And processor device, this processor device is used to carry out the method that is used to control fuel supply between the starting period of the internal-combustion engine with at least two firing chambers of the invention described above.
A third aspect of the present invention relates to a kind of electric machine control system that comprises computer-readable medium, it is characterized in that, computer-readable medium comprises a software program, after in an electric machine control system that is provided with the combustion detection device, said procedure being downloaded, become and have the electric machine control system of enforcement according to the function of said method.Described electric machine control system (ECM) is provided with the interface device that is used for controlling the fuel supply system that supplies fuel at least one firing chamber of internal-combustion engine, and is used for surveying the combustion detection device in the burning of at least one firing chamber.Summary of the invention
Below will the present invention be described in further detail by embodiment.By with reference to following accompanying drawing, carry out embodiment's description.
Fig. 1 is the schematic representation with internal-combustion engine of startup and fuel supply system;
Fig. 2 is the flow chart that the method according to this invention is used for the control algorithm of fuel supply;
Fig. 3 has shown that the method according to this invention is in the air fuel ratio of any change between cylinder between the starting period;
Fig. 4 has shown the change according to the other air fuel ratio of the method that progressively changes air fuel ratio between the starting period of the present invention;
Fig. 5 shown according to usefulness of the present invention obviously dense air-fuel mixture carry out the change of other air fuel ratio of the method for firing chamber forced ventilation;
Embodiment
Have four firing chamber 4a...4d at the internal-combustion engine shown in Fig. 11.Internal-combustion engine 1 is provided with intake manifold 2 and gas exhaust manifold 3.The air that is used for burning in the firing chamber is inhaled in the firing chamber by filter cleaner 20 and airflow meter 22.Airflow meter 22 can be " hot line " form, can determine to suck the gross mass of firing chamber by it.Fuel is fed to oily rail (fuel rail) 12 by petrolift 11 through fuel supply pipeline 14 from a main fuel tank 10, arrives each firing chamber then.In Fig. 1, also shown intermediate receptacle 17, this container can to the north of regard any container between main fuel tank 10 and oily rail 12 as.This intermediate receptacle can be to be formed by fuel supply pipeline, fuel filter and fuel accumulator etc., and can run up to sizable volume.
In traditional fuel supply system, return tube 15 often is installed between oily rail 12 and the fuel tank 10.The purpose of return tube 15 is to guarantee continuous the flowing of determining of the fuel in oily rail 12, avoids because the air-resistance phenomenon that high engine temperature is brought.In not having other system of air-resistance phenomenon, petrolift 11 is controlled by the pressure transducer in oily rail 12, so that stress level is remained on the suitable level.Fuel tank 10 can also further be provided with an oiling opening 16 and oil mass prober 18.
Can control the fuel quantity (sparger that has only shown the right-hand side that is used for cylinder 4d at Fig. 1) that enters into each cylinder 4a...4d by fuel injector 13.Control the endurance that sparger is opened by Electronic Control Unit ECM according to the operating variable of IC engine that detects.Spray the fuel quantity that enters into each cylinder 4a...4d by control, ECM has controlled the air fuel ratio in each cylinder 4a...4d in fact, because known the quality of air from airflow meter 22.ECM has the memory module 21 of storage data.
ECM is in a conventional manner by using cooling-water temperature transmitter 6, engine speed sensor 5, intake manifold pressure sensor or airflow meter 22 to survey main operating variable of IC engine.
From an exhaust gas oxygensensor 7 that is positioned on the gas exhaust manifold 3, can obtain to relate to the feedback information of air fuel ratio.Exhaust gas oxygensensor 7 is usually located in the exhaust airstream before entering catalyst 8.In some systems, also can use second exhaust gas oxygensensor after catalyst 8, this mainly is in order to detect the purpose of catalyst 8., this information can not be used when internal-combustion engine 1 starts, this be since exhaust gas oxygensensor 7 under cold conditions, work unreliable.
By starting electrical machinery 9 edge of gear and flywheel (not shown) is meshing with each other, internal-combustion engine can be activated.
In Fig. 2, shown a flow chart of describing the software program during internal combustion engine start as shown in Figure 1 of method of the present invention.
This software is installed among the ECM.When detecting in decision box 40 when starting, its can occur simultaneously or in advance with the actuating of starting electrical machinery, and program executive routine sequence step 41 is wherein tested to determine whether to occur starting the state of difficulty.Otherwise process turns back to its initial position.The state of startup difficulty is the state of any kind, wherein uses and the preceding dissimilar fuel starting apparatus combustion engine 1 of fuel quality that uses of shutdown, and the fuel quality that uses before this shutdown is designated as old fuel.This can be at one more again after the postcombustion.Or the situation that after short driving or long term stop, can occur.
The internal-combustion engine that uses rock gas to act as a fuel can use the fuel quality with different calorific values.Internal-combustion engine can act as a fuel the mixture of methyl alcohol and gasoline, promptly from all mixtures of the gasoline of 100% methyl alcohol and 100%, also can use the fuel of the fuel quality that there are differences on calorific value/octane value.
In addition, the fuel that uses standard for example diesel oil and the gasoline internal-combustion engine that carries out work also can use the fuel that has different octane and cetane number respectively.In addition, for gasoline, its volatility also is different.
If main fuel tank is annotated again, between the starting period, will supply with different fuel.Multi-fuel internal combustion engine 1 with any mixture of methyl alcohol and gasoline acts as a fuel also can use pure gasoline before for the shutdown of postcombustion.If methyl alcohol is added in the main fuel tank of gasoline of the little residual capacity that only has several liters, so all mixtures are replaced by north the volume of almost pure methyl alcohol in main fuel tank 10.
In most fuel system, it is successful in most of the cases starting., fresh fuel is supplied with by petrolift at once, and firing chamber 4a...4d will bear the instantaneous change from old fuel to the fresh fuel main fuel tank 10.
If so instantaneous change takes place in the internal-combustion engine 1 of operation, need new fuel quality be adapted to.In case exhaust gas oxygensensor reaches operating temperature, can from combustion process, obtain return information and indicate current air fuel ratio.If the quality of new fuel is lower, need set up a correction factor, this correction factor increases the fuel quantity of being supplied with, and therefore has a lower air fuel ratio.
By using the fuel quantity prober 18 in fuel tank 10, can detect one and replenish the incident of refueling, as shown in Figure 1.Signal from level indicator 18 is transported among the ECM, so that judge an additional oiling incident.Under the condition of compressed natural gas internal-combustion engine, can judge the incident of fueling by the pressure transducer in fuel tank 10.In addition, also can use filling sensor at filling opening 16 places of fuel tank 10.
In a further embodiment, in system, do not use to add note detector,, then can infer the state that difficulty occurred starting if internal-combustion engine does not carry out work in the predetermined short time.Be used for internal-combustion engine not disturbed operation last time bar can to the north of be stored in ECM ground storage 21.If this last time bar approaches the time bar that needs run out of the time bar of the old fuel in the system of remaining in, will show and indicate one and start difficult state.
Another starts difficult state corresponding to a long relatively parking time limit, if particularly for fuel supply system be a kind of in system fuel tank 10 and sparger 13 between the situation of quite few fuel of preserving, if and/or be kept at two of system and connect fuel in the middle of stars 10 and the sparger 13 and be easy to be withdrawn into situation in the main fuel tank 10.
If survey or predict above-mentioned startup situation of difficult, program will proceed to program step 42, wherein reset the correction factor of being set up during the internal combustion engine start in the end, for example be set to 1.0, that is to say, anyly determine to be set to null value for the deviation that makes internal-combustion engine normally move amount of fuel needed.
In next program step 43, determine the essential fuel quantity that the fuel injector 13 by each cylinder 4a...4d is sprayed in the correction of the fuel quantity that is used for each cylinder 4a...4d from the image that is stored in storage 21 and the method according to this invention.As previously mentioned, the control of the fuel quantity that each sparger 13 is sprayed is just to the control of the air fuel ratio of each cylinder 4a...4d.
Above-mentioned image determines that by experience described image has provided each required fuel quantity of combination corresponding to speed at least, load and the temperature of internal-combustion engine 1.In this embodiment, suppose the image determine be corresponding to internal combustion engine under the fuel situation of the best, promptly need use up quite few fuel quantity, and the correction of any basic fuel quantity all can cause the variation of fuel quantity for normal combustion.In practice, above-mentioned image can continue the time limit corresponding on average opening of sparger 13.
By coming interpreter step 43 with reference to figure 3.The selected fuel quantity F that is used for cylinder 4a of the method according to this invention
CYL1, can provide i.e. MAP_FUEL, correction factor CF by the indicated amount of image.If the acquisition of above-mentioned image is that the hypothesis corresponding to best fuel quality is correct, be ejected into F
CYL1Fuel quantity will be corresponding to value given in the image.Among the relative air fuel ratio that in cylinder 4a, is obtained such as Fig. 3 at the A/F of vertical A/F axis
1Locate shown in the initial dotted line, promptly internal-combustion engine 1 may the thinnest air fuel ratio.
The selected fuel quantity F that is used for cylinder 4b of the method according to this invention
CYL2, can be to add a little increasing amount Δ f with the selected identical fuel quantity of cylinder 4a.Increasing amount Δ f can select like this, promptly will be by mark 1/X difference to some extent by being injected in the air fuel ratio that obtains among each cylinder 4a...4b, wherein X is the number of the cylinder of internal-combustion engine, and within from described internal-combustion engine 1 the thinnest as far as possible foreseeable air-fuel mixture to the scope the denseest air-fuel mixture.So the selected fuel quantity of cylinder 4b for four-cylinder internal combustion engine can be expressed as:
F
CYL2＝CF*MAP_FUEL+(1/4*MAX_FUL-MAP_FUEL)
The relative air fuel ratio that in cylinder 4b, is obtained as in Fig. 3 at the A/F of vertical A/F axis
1Below shown in the initial dotted line, promptly initially corresponding to below the dotted line of the thinnest as far as possible air fuel ratio of in cylinder 4a, spraying of internal-combustion engine 1.
By similar mode, can the method according to this invention select to be used for the fuel quantity F of cylinder 4c
CYL3So, by further increasing amount Δ f, increase the air fuel ratio of cylinder 4c, so can be expressed as for the selected fuel quantity of cylinder 4c of four-cylinder internal combustion engine:
F
CYL3＝CF*MAP_FUEL+(2/4*MAX_FUL-MAP_FUEL)
The relative air fuel ratio that is obtained in cylinder 4c can be represented by the dot and dash line in Fig. 3.For last and cylinder 4d " rich oil ", can increase the air fuel ratio of cylinder 4d by further increasing amount Δ f, promptly its representation is
F
CYL4＝CF*MAP_FUEL+(3/4*MAX_FUL-MAP_FUEL)
The relative air fuel ratio that is obtained in cylinder 4d can be represented by the double dot dash line in Fig. 3.
As shown in Figure 3, in cylinder 4d, begin to obtain the position of the state of " rich oil " and internal-combustion engine the denseest as far as possible foreseeable state, promptly by A/F on the A/F axis
2Represented position, a distance, delta f at interval.
In practice, the foreseeable the thinnest and the denseest state of internal-combustion engine is corresponding to the shortest and the longest the opening the time of using sparger that can the commercial fuel quality that obtains.If the fuel quality difference that is obtained is bigger, can adjust restriction A/F
1And A/F
2
When using starting electrical machinery to come starting apparatus combustion engine, provide different air fuel ratios for each cylinder 4a...4d.The actual mixing ratio of each cylinder is maintained at 3 circulations that are used among Fig. 3 at first.Indicate in the drawings, obtained successful igniting in the second and the 3rd circulation for cylinder 4c.In this embodiment, if in an independent cylinder 4a...4d, obtain two continuous burnings, then can think to have set up successful igniting.If detect the igniting of success in program step 44 (Fig. 2), then the program execution in step 47.If the cylinder 4a in the second and the 3rd cycle period at other does not detect burning among 4b and the 4d, the fueling amount of cylinder 4a and 4b is increased to and the identical fuel quantity of the employed fuel quantity of cylinder 4c that occurs successfully lighting a fire at once at least.
, the big cylinder of mixture concentration of the cylinder of lighting a fire than success for air-fuel mixture wherein need be taked other measure.For the cylinder of concentration greater than optimum mixture concentration, example cylinder 4d as shown in FIG. 3, advantageously countercylinder 4d carries out forced ventilation.By supply, will cause the mixture concentration of ratio the best of the air-fuel mixture of being supplied with low, so reached the effect of ventilation to the loop control fuel that suitably limits to a number or amount.The mixture concentration of cylinder 4d the from the 3rd to the 5th circulation is lower than best concentration as can be seen in Fig. 3, promptly than the air fuel ratio A/F of the best
IdealA low amount Δ f
CORR
Shown another kind of method of the present invention in Fig. 4, this method can be in the air fuel ratio that requires relative narrower so that implement in the application of the igniting of succeeing.Such application can comprise the internal-combustion engine 1 of the using scope with quite wide fuel quality scope.Although by initial setting, so the air fuel ratio that obtains is distributed within the internal-combustion engine 1 foreseeable scope fifty-fifty, incombustible state promptly appears to sparger 13 in the problem that may occur starting in arbitrary cylinder 4a...4d between the starting period.
Under such state, need to implement additional measure and overcome this problem.Pointed out this measure in the flow chart element 45 and 46 in the flow sheet of Fig. 2.If incombustible situation, in flow sheet, carry out frame 45 continuously from decision box 44.If internal-combustion engine is not activated in the circulation of a predetermined quantity, for example 6 circulations among Fig. 4, it is surveyed by Fig. 2 center 46, and the fuel quantity to each single sparger is increased a predetermined amount then, thereby produces a lower air fuel ratio A/F.This can be by realizing that such as the correction factor CF in the frame 46 that is increased among Fig. 2 after this flow sheet is carried out frame 43 continuously so that determine to supply to the air fuel ratio of each cylinder 4a...4d.
Be used for increasing the numerous predetermined amount Δ f of fuel quantity
STEPA different part aspect the fuel capacity in supplying to another firing chamber 4a...4d that obtains approaching but the most different air fuel ratio A/F just.
When the compression stroke quantity in a single firing chamber surpasses the quantity that (is preferably 4) within the scope of 2-10 compression stroke, additional progressively increasing amount of beginning in this firing chamber.
If there is not the burning of succeeing, then when the air fuel ratio that is increased for a cylinder 4a...4d during near air fuel ratio in the initial use of the cylinder 4a...4d of next " than rich oil ", any further progressively increasing amount be interrupted.Under this situation, the first and second amount Δ f that are scheduled to, Δ f
STEPCan obtain less, and method carried out therewith again.
In Fig. 4, demonstrate and detect at first successful begun two increasing amount step Δ f progressively before the burning
STEP, following the second successful combustion regime of the not combustion regime of a detection and a detection after this.It is a typical feature that like this one has burning and unburned burning order alternately, if air-fuel mixture is oil-poor (thin) to a certain extent, and be enough to form the correct air-fuel mixture that is suitable for successfully burning from the residual fuel amount of unburned step.
Under this situation, all firing chamber 4a...4d with thinner air fuel ratio A/F are changed the identical air fuel ratio in firing chamber that becomes to have and detect the first success burning.Supply to the firing chamber with denseer air-fuel mixture, be cylinder 4d herein, in fuel in step subsequently, be reduced.Another the 3rd progressively the increasing amount step be introduced in cylinder 4a, after the fuel supply of 4b and 4c, in cylinder 4a...4c, detect reliable burning in each ignition event.
The advantage of this method is to control three cylinder 4a...4c at least, so can obtain the burning of a success on each in three cylinder 4a...4c fast, and only change the 4th remaining firing chamber gradually, need to a certain degree denseer air-fuel mixture so that determine whether.
In Fig. 5, shown other a kind of method of the present invention, this method can be advantageously implemented wall-wet (wall-wetting) problem occurring or have a large amount of residual fuels to be included in the application among the 4a...4d of firing chamber after not burning.In this embodiment, can have been found that supply has the forced ventilation that extends among the firing chamber 4a...4d of excessively dense mixture at these.When countercylinder 4a-4c sets up " ideal " (indicating) air-fuel mixture A/F on vertical axis
IdealThe time, produce successful burning at each cylinder, for 4d, carry out excessive oil-poor control with mixture denseer than ideal burning.In this embodiment, injected fuel quantity is changed the fuel quantity identical with the fuel quantity that initially supplies to cylinder 4c, and this cylinder 4c has near desirable air-fuel mixture A/F
IdealThinner mixture.In this embodiment, because the fuel quantity of cylinder 4d is changed the fuel quantity identical with the fuel quantity that initially supplies to cylinder 4c.After this changes, for circulation, by a little progressively increasing amount (Δ f at the predetermined quantity of a time
CORR) increase fuel quantity, and the fuel quantity in supplying to cylinder 4d is identical with fuel quantity among other the cylinder 4a...4c at least.
In an illustrated embodiment, the firing chamber number, promptly 4a...4d can begin coding as the front end from internal-combustion engine corresponding to the order of the cylinder in internal combustion engine cylinders.In Fig. 1, cylinder 4a, 4b, 4c and 4d can correspond respectively to cylinder 4a, 4b, 4c and the 4d in Fig. 3-5.Cylinder 4a in Fig. 3-5,4b, 4c and 4d also can be corresponding to firing orders.
Under the scope that does not break away from notion of the present invention, can carry out other mode of execution.If at least two firing chamber 4a...4d, obtain a different A/F, in the cylinder of any specific, in each second ignition event, can detect the burning of a success, the recirculation that can suppose the nature of residual fuel will cause the burning of success.If internal-combustion engine has a predictable behavior pattern, such as the amount of the recirculation of the remaining fuel of the ignition event that relates to never burning, this pattern will be used with a step rate Δ f
CORRFunction as pattern increases fuel quantity.
Even controlling air fuel ratio A/F so that occur to implement the change progressively of further fuel under the successful situation of burning in each ignition event.In the change direction of the increase of fuel and minimizing, can control the change progressively of a such fueling amount in the mode of closed loop.A method is the instantaneous acceleration of observing bent axle, promptly uses speed probe 5.Such speed probe can be the 72-x form, 72 teeth is set and uses described speed probe to survey in the periphery of flywheel.By measuring the time of two teeth, can detect instantaneous acceleration through sensor.When the value of acceleration is higher than a specific threshold values, can detect the burning of a success.The increase of the value by instantaneous acceleration can detect an improved burning.
Other method that is used for surveying successfully burning is to use the sensor that is installed in the firing chamber, surveys actual burning.Such sensor can be ionization sensor, pressure transducer or photoreceptor, and they detect ionization respectively, pressure increases or the increase of light intensity.The present invention does not limit the combustion detection device of any kind.
Although invention has been described by the foregoing description, do not breaking away under protection scope of the present invention, the those of ordinary skill in the technology of the present invention field can carry out other changes and improvements.Therefore, the disclosed content of this specification does not constitute any restriction to the present invention.
Claims (12)
1. between the starting period of internal-combustion engine, be used to control the method for fuel supply with at least two firing chambers, control the air fuel ratio (A/F) in each described firing chamber (4a...4d) by this way, be that the air fuel ratio (A/F) that each described firing chamber (4a...4d) is obtained is different, the air fuel ratio (A/F) in first firing chamber in described firing chamber (4a...4d) is controlled to be the first air fuel ratio (A/F
1), with be lower than first air fuel ratio for other the air fuel ratio of each firing chamber in the described firing chamber by first of the step separately predetermined amount (Δ f), first detects a firing chamber in described firing chamber (4a...4d) after the successfully igniting, and the air fuel ratio (A/F) of controlling at least one in other firing chamber in the described firing chamber (4a...4d) is to equal the air fuel ratio (A/F of described first firing chamber substantially
Ideal), when detecting predetermined number of consecutive burning one of in described firing chamber (4a...4d), will detect the igniting of a success.
2. method according to claim 1 is characterized in that, the first predetermined amount (Δ f) equals the first air fuel ratio (A/F
1) deduct one second air fuel ratio (A/F
2) deduct 1 divided by the quantity of the firing chamber of internal-combustion engine (1), the first air fuel ratio (A/F wherein
1) be the highest air fuel ratio (A/F that internal-combustion engine (1) is predicted
Max), the second air fuel ratio (A/F
2) be the minimum air fuel ratio (A/F that internal-combustion engine (1) is predicted
Min).
3. method according to claim 1 is characterized in that, in the cycle period of a predetermined quantity, the air fuel ratio that air fuel ratio is lower than second firing chamber of the air fuel ratio in first firing chamber controls to an air fuel ratio (A/F who is higher than in first firing chamber
Ideal) second predetermined amount (the Δ f
CORR).
4. method according to claim 1 is characterized in that, in the cycle period of a predetermined quantity, the air fuel ratio that air fuel ratio is lower than second firing chamber of the air fuel ratio in first firing chamber controls to an air fuel ratio (A/F who is lower than in first firing chamber
Ideal) second predetermined amount (the Δ f
CORR), to the continuous burning in first firing chamber and do not burn survey after so that determine whether the low slightly air fuel ratio that need be used for successfully lighting a fire.
5. method according to claim 4 is characterized in that, by the recirculation mode of residual fuel in the firing chamber of described internal-combustion engine (1) (4a...4d), determines described second predetermined amount (the Δ f
CORR).
6. according to claim 3 or 4 described methods, it is characterized in that, determine described second predetermined amount (the Δ f
CORR) progressively reduced, equal air fuel ratio (A/F in first firing chamber substantially up to the air fuel ratio in second firing chamber
Ideal).
7. method according to claim 1 is characterized in that, when the igniting that does not detect success in the cycle period of some, by the 3rd predetermined amount (Δ f
Step) air fuel ratio (A/F) of change in institute's combuster.
8. method according to claim 7 is characterized in that, in the scope of the circulation of described predetermined quantity between 2 and 10, is preferably 4.
9. method according to claim 1, it is characterized in that, the igniting of a success in firing chamber (4a...4d) is surveyed in crankshaft accelerations by surveying internal-combustion engine (1), the ionization in firing chamber (4a...4d), pressure increase or the variation of light intensity in firing chamber (4a...4d) in firing chamber (4a...4d).
10. according to the described method of aforementioned claim 1; it is characterized in that; this method just just can be implemented after surveying or predicting the state that starts difficulty, and the described state that starts difficulty comprises again the long-time shutdown of the short-time duty or the internal-combustion engine (1) of fueling incident, internal-combustion engine.
11. be used to control the system that supplies fuel to internal-combustion engine, wherein this internal-combustion engine comprises that at least two firing chambers and at least one single being used to supply fuel to the sparger of each independent firing chamber, this system comprises:
-be used to store the storage device of following information:
-supply with a predetermined fuel quantity according to the running state of internal-combustion engine, and
-that need during internal combustion engine operation and correcting value that set up is so that by proofreading and correct the optimum efficiency that a predetermined fuel quantity of being supplied with obtains internal-combustion engine according to the running state of internal-combustion engine;
-be used for surveying combustion detection device in the burning of arbitrary described firing chamber; And
-processor device, this processor device are used for carrying out according to the described method of one of claim 1 to 10.
12. electric machine control system that comprises computer-readable medium, this computer-readable medium comprises a software program, in electric machine control system (ECM), pass through said procedure, become and have the electric machine control system of enforcement according to the function of the described method of one of claim 1 to 11, described electric machine control system (ECM) is provided with and is used for the interface device that control supplies fuel to the fuel supply system of at least one firing chamber of internal-combustion engine (1) (4a...4d), and is used for surveying the combustion detection device in the burning of at least one firing chamber.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL1011907A NL1011907C2 (en) | 1999-04-27 | 1999-04-27 | Method and device for starting internal combustion engines. |
| NL1011907 | 1999-04-27 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1349589A CN1349589A (en) | 2002-05-15 |
| CN1139723C true CN1139723C (en) | 2004-02-25 |
Family
ID=19769097
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB008068550A Expired - Fee Related CN1139723C (en) | 1999-04-27 | 2000-04-27 | Method and systme for starting combustion engines |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP1173666B1 (en) |
| JP (1) | JP2002543326A (en) |
| CN (1) | CN1139723C (en) |
| AU (1) | AU764458B2 (en) |
| CA (1) | CA2367739A1 (en) |
| DE (1) | DE60011260T2 (en) |
| NL (1) | NL1011907C2 (en) |
| WO (1) | WO2000065217A1 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2817589A1 (en) * | 2000-12-06 | 2002-06-07 | Renault | Fuel injection control method for motor vehicle internal combustion engine starting involves steadily increasing the amount of gaseous fuel injected during the starting phase |
| JP3991809B2 (en) | 2002-08-01 | 2007-10-17 | トヨタ自動車株式会社 | Fuel injection device for start of internal combustion engine |
| DE10238241B4 (en) * | 2002-08-21 | 2010-04-22 | Robert Bosch Gmbh | Method for operating an internal combustion engine |
| JP4557816B2 (en) * | 2004-12-17 | 2010-10-06 | トヨタ自動車株式会社 | ENGINE START CONTROL DEVICE, METHOD THEREOF, AND VEHICLE MOUNTING THE SAME |
| JP4840244B2 (en) * | 2007-04-26 | 2011-12-21 | 株式会社デンソー | Air-fuel ratio control device and engine control system |
| DE102007035317B4 (en) | 2007-07-27 | 2023-10-05 | Robert Bosch Gmbh | Method for operating an internal combustion engine |
| GB2524318B (en) * | 2014-03-21 | 2017-12-13 | Jaguar Land Rover Ltd | Method of injecting fuel into an internal combustion engine |
| DE102016226132A1 (en) * | 2016-12-23 | 2018-06-28 | Robert Bosch Gmbh | Method for determining an injection quantity of an injector |
| CN114251180B (en) * | 2021-12-22 | 2024-05-28 | 重庆康明斯发动机有限公司 | Method, device, equipment and storage medium for gas engine starting control |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3982519A (en) | 1975-05-27 | 1976-09-28 | Ford Motor Company | Electronic-fuel-injection-system enrichment circuit for use during engine cranking |
| GB1567041A (en) * | 1975-11-06 | 1980-05-08 | Allied Chem | Fuel injection system |
| JPS57146031A (en) | 1981-03-04 | 1982-09-09 | Nissan Motor Co Ltd | Method of supplying fuel upon starting in internal combustion engine |
| US5579737A (en) * | 1993-07-21 | 1996-12-03 | Unisia Jecs Corporation | Method and apparatus for electronically controlling a fuel supply to an internal combustion engine |
| DE4329448B4 (en) * | 1993-09-01 | 2007-08-23 | Robert Bosch Gmbh | Method and device for metering fuel in the starting case of an internal combustion engine |
| US5579739A (en) * | 1994-01-14 | 1996-12-03 | Walbro Corporation | Returnless fuel system with demand fuel pressure regulator |
| JPH08338282A (en) * | 1995-06-09 | 1996-12-24 | Toyota Motor Corp | Fuel injection control device for multi-cylinder internal combustion engine |
-
1999
- 1999-04-27 NL NL1011907A patent/NL1011907C2/en not_active IP Right Cessation
-
2000
- 2000-04-27 CA CA002367739A patent/CA2367739A1/en not_active Abandoned
- 2000-04-27 DE DE60011260T patent/DE60011260T2/en not_active Expired - Fee Related
- 2000-04-27 EP EP00927945A patent/EP1173666B1/en not_active Expired - Lifetime
- 2000-04-27 CN CNB008068550A patent/CN1139723C/en not_active Expired - Fee Related
- 2000-04-27 JP JP2000613937A patent/JP2002543326A/en active Pending
- 2000-04-27 WO PCT/NL2000/000275 patent/WO2000065217A1/en active IP Right Grant
- 2000-04-27 AU AU46248/00A patent/AU764458B2/en not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| AU4624800A (en) | 2000-11-10 |
| CN1349589A (en) | 2002-05-15 |
| EP1173666A1 (en) | 2002-01-23 |
| DE60011260T2 (en) | 2005-06-23 |
| JP2002543326A (en) | 2002-12-17 |
| EP1173666B1 (en) | 2004-06-02 |
| AU764458B2 (en) | 2003-08-21 |
| NL1011907C2 (en) | 2000-10-30 |
| WO2000065217A1 (en) | 2000-11-02 |
| DE60011260D1 (en) | 2004-07-08 |
| CA2367739A1 (en) | 2000-11-02 |
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