CN105715444A - Method And Control Device For Operating Internal Combustion Engine - Google Patents
Method And Control Device For Operating Internal Combustion Engine Download PDFInfo
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- CN105715444A CN105715444A CN201511035828.1A CN201511035828A CN105715444A CN 105715444 A CN105715444 A CN 105715444A CN 201511035828 A CN201511035828 A CN 201511035828A CN 105715444 A CN105715444 A CN 105715444A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P17/00—Testing of ignition installations, e.g. in combination with adjusting; Testing of ignition timing in compression-ignition engines
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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
- F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
- F02D35/02—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions
- F02D35/023—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions by determining the cylinder pressure
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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
- F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
- F02D35/02—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions
- F02D35/028—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions by determining the combustion timing or phasing
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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
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/3809—Common rail control systems
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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
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/06—Fuel or fuel supply system parameters
- F02D2200/0611—Fuel type, fuel composition or fuel quality
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The present invention relates to a method for determining an ignition delay curve (CRVO) of an internal combustion engine, which represents a time delay between an energy input changing curve and an energy conversion changing curve of the internal combustion engine. The method comprises the following steps: obtaining (20) an energy conversion changing curve (BV) of the internal combustion engine; obtaining (21) an energy input changing curve (EV) of the engine; and calculating (22) the ignition delay curve (CRVO) based on the energy input changing curve (EV) and the energy conversion changing curve (BV).
Description
Technical field
The present invention relates to a kind of method for running internal combustion engine and control equipment, the control equipment of the method for especially a kind of firing delay change curve for determining internal combustion engine, a kind of method for cognitron fuel quality, a kind of method of absolute position of energy input change curve pattern for feedforward internal combustion engine and a kind of internal combustion engine for determining firing delay change curve.
Background technology
Cause that assembly is complicated currently for the requirement that internal combustion engine is increasingly higher in energy consumption, discharge and power, and cause that control flow is complicated and calculates loaded down with trivial details.In the control of internal combustion engine, different parameters, such as spray that other of relevant parameter or internal combustion engine regulate parameters, such as cylinder charge and/or ER EGR Rate are adjusted by so that real variation in combustion curve (Actual combustion change curve) is approximately equal to desired variation in combustion curve (specified variation in combustion curve).
The parameter relevant in order to pre-determine injection, such as can include in ignition delay time and consider, as the monodrome (Einzelwert) of each burn cycle or as the monodrome that injection occurs every time.DE102012018617B3 such as describes a kind of for the method to affect the running status of internal combustion engine by variation in combustion curve model and ignition delay time, and wherein, described variation in combustion curve model is based on several fulcrum and provides.But based on this variation in combustion model, can not precisely enough control internal combustion engine.
Furthermore it is known that to determine nozzle parameter based on the regulation and control of iterative learning under the premise considering variation in combustion curve, as described in DE102007012604A1 and DE102007013119A1.Correspondence problem can be solved by a kind of experimental displacement function, and this displacement function necessarily depends upon the boundary condition of burning, and has to comply with service condition.But owing to very big change can occur service condition, it is provided that described experimental displacement function bothers very much, and the experimental displacement function formed unreliable.
Summary of the invention
The task of the present invention is to provide the method for the firing delay change curve for determining internal combustion engine, a kind of for identifying the method that fuel quality changes, a kind of method of absolute position for feedforward energy input change curve pattern and a kind of control equipment for determining firing delay change curve, it overcomes deficiency mentioned above at least partly.
A kind of method that the present invention relates to firing delay change curve for determining internal combustion engine according to first aspect, this firing delay change curve represents that the energy input change curve of internal combustion engine and energy convert between change curve delay in time, including:
Obtain the energy input change curve of described internal combustion engine；The energy obtaining described internal combustion engine converts change curve；And
Convert change curve based on described energy input change curve and based on described energy, calculate firing delay change curve.
According to another aspect, the present invention relates to a kind of for identifying the method that fuel quality changes, including:
Especially according to the method according to above-mentioned first aspect, it is determined that described internal combustion engine is for the firing delay change curve of the first cycle of operation of this internal combustion engine；
Calculate the difference between determined firing delay change curve and stored firing delay change curve；And
Change based on the difference identification fuel quality calculated.
According to another aspect, the method that the present invention relates to the absolute position of a kind of energy input change curve pattern for feedforward internal combustion engine, including:
Determine that a previously given energy converts the reference point in the energy conversion change curve integration of change curve；
Based on firing delay change curve, especially a kind of according to the determined firing delay change curve of the method according to first aspect, calculate the firing delay corresponding with this reference point；And
On the basis of described reference point, the firing delay calculated and combustion centre's rated value, it is determined that the absolute position of energy input change curve pattern.
According to another aspect, the present invention relates to the control equipment of a kind of firing delay change curve for determining internal combustion engine of internal combustion engine, wherein, described control equipment designed to be used the method performed according to the one aspect of above-mentioned aspect.
More advantageous configuration of the present invention are drawn by the explanation carried out below for preferred embodiment.
A kind of method that the present invention relates to firing delay change curve for determining a kind of internal combustion engine, such as diesel engine or gasoline engine, described diesel engine such as has direct spraying system or stores spraying system (common-rail injection system).Described firing delay change curve represents and converts between change curve delay in time at the energy input change curve of described internal combustion engine and energy.Described energy input change curve can be the one injection change curve of described internal combustion engine, and it can be a kind of variation in combustion curve or a kind of heating change curve that described energy converts change curve.Above-mentioned the method according to the invention includes: the energy obtaining described internal combustion engine converts change curve and obtains the energy input change curve of described internal combustion engine.The acquisition of acquisition and energy input change curve that energy converts change curve can carry out simultaneously or carry out with any sequence.Above-mentioned the method according to the invention comprises additionally in: converts change curve based on described energy input change curve and based on described energy, calculates firing delay change curve.Described firing delay change curve can calculate according to the crank axle angle of time or combustion engine crank axle.
Firing delay change curve calculated, temporal delay that is that describe between energy input (such as injection) and energy conversion (such as burning) allows for being possibly realized to regulate one or more parameter affecting combustion in IC engine according to this firing delay change curve, thus defining a kind of rated energy that is similar in the running of internal combustion engine to convert the energy conversion change curve of change curve, for instance a kind of variation in combustion curve being similar to specified variation in combustion curve.
Described energy converts change curve, such as described variation in combustion curve and such as presents using the heat in the cylinder of described internal combustion engine or the energy function as the crank axle angle of described combustion engine crank axle or the function as the time that convert.Described energy converts change curve and can constitute based on multiple sampled points, and comprises described sampled point and/or be similar to the interpolation curve depicted described sampled point, such as passed through these sampled points.Described energy converts change curve and is such as generated by high time resolution signal.Described sampled point can be calculated based on the measurement signal of cylinder pressure measurement.Described energy converts change curve and can also be or comprise simulation curve, and its simulation changed by a kind of simulation, such as cylinder pressure calculates.Described energy converts change curve and can comprise and multiple such as have the orientation point that invariable interval or Arbitrary distribution convert on change curve at described energy, or can comprise the sampled point based on one-shot measurement.
Described energy input change curve, such as described injection change curve such as exist using the injected amount of fuel function as the crank axle angle of described combustion engine crank axle or the function as the time.Described energy input change curve can comprise one or more pilot injection, one or more main injection and one or more rear injection.Each injection can have the shape of complexity, and such as can be formed as boot last injection (the energy input change of shoe-like), inclined-plane injection (change of triangle energy input), square injection (rectangular energy input change).Described energy input change curve can be constituted based on a kind of model, and injection starting point, emitted dose and the injection duration that every height sprays such as considered by this model.The parameter of other impact injection can be added, for instance expulsion pressure and/or ejector overall characteristic in described model.Replacement scheme is, can measure described energy input change curve.Described energy input change curve can comprise and multiple such as has invariable interval or the Arbitrary distribution orientation point on this energy input change curve, or can comprise the sampled point based on one-shot measurement.
Can spray and during burn cycle or during a cycle of operation of described internal combustion engine, obtain described variation in combustion curve during a previously given time period, such as at one.But as another example, multiple cycle of operation of also sustainable described internal combustion engine of described time period.It is that self-injection process starts until this time period of being terminated by the burning caused by this course of injection that injection and burn cycle can be understood as, described course of injection potentially include pilot injection, main injection and/or after spray.It is such a time period that the cycle of operation of described internal combustion engine can be understood as, and it includes the absorption of described internal combustion engine, compression, expansion and release stage and includes whole injection and burn cycle.
Convert change curve to obtain described energy, such as by the sensor in described cylinder of internal-combustion engine, such as pressure transducer or the signal being included multiple sampled value by storage device reception, and the interpolation curve of described sampled point can be constituted.The composition of described interpolation curve can be undertaken by interpolation method, such as linear interpolation or spline interpolation.Described energy convert change curve acquisition can comprise additionally in receive measure signal, such as cylinder pressure measurement and/or this measurement signal is transformed into energy conversion running parameter, such as convert measured cylinder pressure value to caloric value.Replacement scheme or additional project are to convert change curve to obtain described energy, for instance can be received signal by a kind of analog or a kind of storage device, and described signal includes one and represents that described energy converts analog function or the interpolating function of change curve.
The acquisition of described energy input change curve such as includes the model obtaining energy input change curve, described model is to generate on the basis of energy input parameter (such as nozzle parameter), described energy input parameter and energy convert (such as burning) corresponding, such as before and/or the basis of energy input process (such as course of injection) that simultaneously carries out.Described model can such as be received by a kind of analog or storage device, or be directly based upon described nozzle parameter, the injection starting point of especially each height injection, injection duration and emitted dose and generate.
The method according to the invention, the calculating of described firing delay change curve can include constituting the energy input change curve integration of described energy input change curve, constitute described energy converts the energy of change curve and converts change curve integration and described energy input change curve integration and described energy converts change curve integration being mutually adapted each other.Described energy input change curve integration and described energy convert the composition of change curve integration may be included in described energy input change curve or when described energy converts change curve, the such as gauging surface area when the simulation curve of described energy input change curve or described energy convert the interpolation curve of change curve.Described energy input change curve integration and described energy convert the adaptation of change curve integration can comprise described energy input change curve integration and the normalization of described energy conversion change curve integration.Replacement scheme is, described energy input change curve integration can by with applicable multiplication and adapt to described energy convert change curve integration come, or described energy convert change curve integration can by with applicable multiplication and adapt to described energy input change curve integration.
The method according to the invention, the calculating of described firing delay change curve can farther include: converts change curve point for more previously given energy, determining and converted the change curve point the first firing delay value to the following point of adaptive energy input change curve integration by the previously given energy of adaptive energy conversion change curve integration, the functional value of described point is equal to described energy and converts the functional value of change curve point and the product of coefficient a；And generate the first sub-change curve of firing delay based on determined first firing delay value.The calculating that replacement scheme or additional project are described firing delay change curves can farther include: for multiple previously given energy input change curve points, determining the second point ignition delay value of the following point being converted change curve integration by the previously given energy input change curve point of adaptive energy input change curve integration to adaptive energy, the functional value of described point is equal to the functional value of described energy input change curve point and the product of coefficient a；And generate the sub-change curve of second point ignition delay based on determined second point ignition delay value.Described firing delay change curve can be the merging data of the described first sub-change curve of firing delay and the described sub-change curve of second point ignition delay, or equal to the described first sub-change curve of firing delay or equal to the described sub-change curve of second point ignition delay.
Described previously given energy converts change curve point can be equal to orientation point or the sampled point of described energy conversion change curve.Described energy is converted change curve point and also can choose at random or be determined by the energy conversion desired sizes values of change curve integration, such as described energy conversion the 10% of total value of change curve integration, 20% ... 100% described in interpolation.Described previously given energy input change curve point can be equal to orientation point or the sampled point of described energy input change curve.Described energy input change curve point also can choose at random, for instance by the desired sizes values of energy input change curve integration described in interpolation, such as the 10% of total value of described energy input change curve integration, 20% ... 100% determines.
It is relevant that described first firing delay value and/or described second point ignition delay the value described first sub-change curve of firing delay and/or the described sub-change curve of second point ignition delay in other words preferably convert change curve integration to described adaptive energy input change curve integration or described adaptive energy.Each first firing delay value such as can convert the crank axle angle of change curve point to corresponding previously given energy or time point is relevant, and, each second point ignition delay value can be relevant to the crank axle angle of the following point of adaptive energy conversion change curve integration or time point, and the functional value of this point is equal to the functional value of described energy input change curve point and the product of coefficient a.Replacement scheme is, described each first firing delay value such as can be relevant to the crank axle angle of the following point of adaptive energy input change curve integration or time point, the functional value of this point is equal to the functional value of described energy input change curve point and the product of coefficient a, further, each second point ignition delay value can be relevant to the crank axle angle of corresponding previously given energy input change curve point or time point.If existing described first or second point ignition delay value be determined, its just can otherwise with adaptive energy input change curve integration, or relevant to adaptive energy conversion change curve integration.
For coefficient a, can be: a=1.In this case, the energy conversion change curve point that described first firing delay value is exactly previously given arrives the interval between such a point of adaptive energy input change curve integration, the functional value of this point converts the functional value of change curve point equal to described energy, and/or, the energy input change curve point that described second point ignition delay value is previously given arrives the interval between such a point of adaptive energy conversion change curve integration, and the functional value of this point is equal to the functional value of described energy input change curve point.Then, can by the one or more first and/or one or more second point ignition delay value generate firing delay change curve.
In some embodiments, can it is desirable that, the firing delay change curve of a unique restriction, a but firing delay excursion are not only provided, this scope allows for there is certain motility when determining nozzle parameter.For this, the first firing delay change curve can be calculated.Converted in change curve integration according to the normalized energy input change curve integration of absolute value 1 and energy, for being used for determining one or more the first of described first firing delay change curve and/or the coefficient a of one or more second point ignition delay value, can be such as: a < 1, for instance a=0.9.It addition, second point ignition delay change curve can be calculated, wherein, the coefficient a that the calculating of second point ignition delay change curve is based on1Different with the coefficient a that the described first firing delay change curve of calculating is based on.Converting in change curve integration according to the normalized energy input change curve integration of absolute value 1 and energy, for determining one or more the first of described second point ignition delay change curve and/or the coefficient a of one or more second point ignition delay value1, for instance can be: a1> 1, for instance a=1.1.Can based on described first firing delay change curve and described second point ignition delay change curve, it is determined that described firing delay excursion.Described firing delay excursion defines a possible scope of described firing delay change curve.Therefore, so that it may such as temperature according to internal combustion engine respectively, below described firing delay excursion, in middle or area above, the firing delay change curve being suitable for is selected.
Replacement scheme is, described coefficient a and/or described coefficient a1Can according to the crank axle angle of combustion engine crank axle, time or at least one illustrate that the parameter of state of working gas in described cylinder of internal-combustion engine, such as cylinder gas temperature change.Such as described coefficient a and/or a1Such as can change according to crank axle angle, time, temperature etc. in a cycle of operation.Therefore, described firing delay excursion may move and/or change its width.Such as, when the working gas temperature in cylinder is relatively low, compared with when working gas temperature is higher, such as during combustion process, firing delay excursion can be at higher value.
Converted, by based on different energy input and/or energy, the firing delay change curve that change curve calculates, may make up a kind of firing delay change curve model.Described firing delay model can such as illustrating by the running status described by one or more measured values by sensor acquisition and/or one or more modeled parameter according to described internal combustion engine.Described firing delay change curve model such as can two characteristic forms stored, wherein, a characteristic curve therein comprises the coordinate of the local minimum of each firing delay change curve, and another characteristic curve then comprises the slope of these firing delay change curve rising edges from described local minimum and the function of crank axle angle.
The firing delay change curve comprised in described firing delay model can be determined by the block testing stand of internal combustion engine.For this, on described block testing stand, for different working condition, record described energy and convert change curve and described energy input change curve, by wherein determining each firing delay change curve.Replacement scheme is, described firing delay change curve can be determined for the service condition required by different in the operation of internal combustion engine.
Additionally, the present invention relates to a kind of method that fuel quality for identifying fuel injected in the combustion zone of internal combustion engine, such as diesel engine or gasoline engine changes.Described method includes determining the firing delay change curve of internal combustion engine, the difference calculated between determined firing delay change curve and stored firing delay change curve and based on the difference calculated, the change of fuel quality being identified.
Based on the change of fuel quality, the parameter affecting combustion in IC engine just can be adjusted and adaptive with the fuel quality changed, in order to realizing actual energy, to convert change curve approximate consistent with desired energy conversion change curve.Such as can become in worse situation at fuel quality, reduce expulsion pressure and/or improve pilot injection amount, in order to compensate owing to fuel is deteriorated the effect brought and such as reduce combustion noise.
Described firing delay change curve usual practice really is as carried out according to the above-mentioned method for determining firing delay change curve.
Firing delay change curve stored, that consider when calculated difference is a kind of desired firing delay change curve when condition remains unchanged in range of operation.Stored firing delay change curve can be determined firing delay change curve (it is such as determined as described above) in a kind of cycle of operation before internal combustion engine, or the firing delay change curve that a kind of and specific energy input change curve is corresponding.
The method that the described fuel quality for identifying fuel changes can such as be activated by the identification of oiling event (Tankereignisses).If internal combustion engine runs in desired range of operation, in such as operating temperature, just current firing delay change curve can be determined, and the firing delay change curve being suitable for for this range of operation for reading out the reference fuel for being stored in data storage.Then, constitute the difference of current firing delay change curve and the firing delay change curve of described reference fuel, and by level evaluation, this species diversity is classified.So, so that it may based on described level evaluation, fuel quality standard is constituted, in order to the adjustment parameter of adaptive described internal combustion engine, such as nozzle parameter.
It addition, the method that the invention still further relates to the absolute position of a kind of energy input change curve integral mode for feedforward internal combustion engine, such as diesel engine or gasoline engine.The absolute position of described energy input change curve integral mode can be the absolute angle position of described energy input change curve integral mode or absolute time location.Described method includes determining that the energy at previously given energy conversion change curve (rated energy conversion change curve) converts the reference point in change curve integration；The firing delay corresponding with this reference point is calculated based on firing delay change curve；And the absolute position of described energy input change curve integral mode is determined based on described reference point, the firing delay calculated and combustion centre's rated value.Described reference point such as can define by referring to crank axle angle and functional value.The functional value of the main injection starting point that described functional value can be equal in energy input change curve integral mode.
Thus, it is the formation of the feedforward based on model of combustion centre position, with reference to the rated value of combustion centre position, by described firing delay change curve model, for instance determine the feedforward value of the control starting point of main injection.Combustion centre's rated value based on energy input change curve (energy input change curve integral mode) before, so elapse in time, the interval between described combustion centre rated value and following spray site is made to meet specific firing delay change curve firing delay change curve model in other words, the functional value of this spray site, equal to the functional value of this combustion centre's rated value, can calculate the control starting point of sought main injection in this way.
The calculating of described firing delay can carry out according to the determined firing delay change curve of the above-mentioned method for determining firing delay change curve based on a kind of.
The acquisition of described firing delay model can include utilizing stored firing delay change curve model, as described above.If described firing delay model stores with two characteristic forms, so, the angle interval between crank axle angle (angle position) and combustion centre's rated value and the reference point of described reference point can be determined by these characteristic curves, and read the firing delay relevant to described reference point.Then, based on these information, the absolute position of described energy input change curve pattern can be calculated.
The above-mentioned method for determining firing delay change curve can be applied by multiple other application processes more, and is particularly suited for regulating the parameter of impact burning.
The present invention relates to the control equipment of a kind of internal combustion engine.Described control equipment designed to be used the above-mentioned method for determining firing delay change curve of execution.It addition, described control equipment is additionally designed to the change for identifying fuel quality and/or the absolute position for feedforward energy input change curve pattern.
Described control equipment such as includes processor, preferred microprocessor and storage device.Described internal combustion engine additionally can include the device for determining energy input change curve, especially monitors the sensor of emitted dose and/or for determining that energy converts the device of change curve, especially cylinder pressure sensors, so as to obtain described energy input change curve or described energy converts change curve.Described device for determining energy input change curve and/or described for determining that energy converts the device of change curve and is preferably connected with described control equipment, for instance pass through data/address bus.Described control equipment can have part or be fully integrated in engine control system.
It addition, the invention still further relates to a kind of motor vehicles, ship and/or a kind of electromotor with internal combustion engine and control equipment as above.Described internal combustion engine can be a kind of diesel engine, the diesel engine such as with directly injection and/or common-rail injection system or a kind of gasoline engine.
Accompanying drawing explanation
Now exemplarily it is described with reference to embodiments of the invention.Wherein:
Fig. 1 schematically shows a kind of embodiment controlling equipment according to the present invention；
Fig. 2 schematically shows the method for determining firing delay change curve according to the present invention；
Fig. 3 is a kind of a kind of example spraying change curve and corresponding variation in combustion curve of internal combustion engine；
Fig. 4 is a kind of a kind of example spraying change curve and corresponding variation in combustion curve of internal combustion engine；
Fig. 5 is that the different variation in combustion curve point for variation in combustion curvilinear integral calculate firing delay；
Fig. 6 is that the difference for described injection change curve integration sprays change curve point calculating firing delay；
Fig. 7 A, 7B are the example of the sub-change curve of firing delay；
Fig. 8 is a kind of example of firing delay change curve；
Fig. 9 A to 9C schematically shows a kind of firing delay change curve model, and it is stored with two characteristic forms；
Figure 10 schematically show according to the present invention for identifying the method that fuel quality changes；
Figure 11 schematically shows the method for the control starting point mainly sprayed for the feedforward according to the present invention；
Figure 12 is a kind of specified variation in combustion curvilinear integral and a kind of indicative icon spraying change curve integral model；And
Figure 13 A to 13C schematically shows a kind of method of control starting point for determining main injection based on firing delay model.
Detailed description of the invention
Figure 1 illustrates a kind of embodiment of the control equipment 1 of a kind of firing delay change curve for determining internal combustion engine.Described control equipment 1 includes storage device 11 and two signal input parts 12,13 being connected with described processor 10 that processor 10 is connected with described processor 10.Described first signal input part 12 designed to be used reception variation in combustion curve BV, and described secondary signal input 13 designed to be used reception injection change curve EV.A kind of example of variation in combustion curve BV and injection change curve EV is such as shown in Figure 3.
Described processor 10 is designed to, for performing a kind of method 2 of firing delay change curve for determining internal combustion engine by the program that is stored in described storage device 11, described firing delay change curve represents between the injection of described internal combustion engine and burning delay in time.The method 2 of the described firing delay change curve for determining internal combustion engine is as shown in Figure 2.In 20, the variation in combustion curve BV generated based on measured cylinder pressure change of described internal combustion engine is received.In 21, the injection change curve EV of described internal combustion engine is received, and this injection change curve EV is corresponding with described variation in combustion curve BV and is based on what nozzle parameter set in burning was modeled out.In 22, based on the variation in combustion curve BV received and the injection change curve EV received, calculate the firing delay change curve ZVV of described internal combustion engine.
Fig. 3 illustrates two curves according to the crank axle angle of described combustion engine crank axle.The curve on the left side reflects injection change curve EV, and the curve close to bell shaped curve on the right then reflects a kind of example of described received variation in combustion curve BV.By crank axle angleShow the starting point of injection, by crank axle angleShow the starting point of burning.It addition, the angle interval D marked in figure 3 between starting point and the starting point of burning of injection, this angle interval determines each firing delay between injection and the fuel combustion sprayed of fuel.
Then, based on the variation in combustion curve BV received and the injection change curve EV received, as described below, firing delay change curve ZVV is calculated.First, the integration (BV) (the variation in combustion curve of integration) of the integration (the injection change curve of integration) constituting the injection change curve EV received and the variation in combustion curve received.Then, the integration of the injection change curve received and the integration of the variation in combustion curve received are by according to 1 normalization.The injection change curve (injection change curve integration inEV) being integrated and being normalized and variation in combustion curve (the variation in combustion curvilinear integral inBV) figure as shown in Figure 4 being integrated and being normalized represent.The curve representing injection change curve integration inEV on the left side has stepping up with two platforms, the curve of the expression variation in combustion curvilinear integral inBV on the right has the change curve similar with the integration of normal distribution, wherein, in the lower zone of the riser portions of described curve, occur in that a protuberance.
Then, based on injection change curve integration inEV and variation in combustion curvilinear integral inBV, vertical intercept method is carried out.Described vertical intercept method illustrates referring now to Fig. 5 and Fig. 6, and wherein, Fig. 5 and Fig. 6 respectively illustrates injection change curve integration inEV and variation in combustion curvilinear integral inBV and represents the orientation point AT of the predetermined point sprayed on change curveEVSampled point AT with the measured value based on cylinder pressureBV。
In the first step, each coordinate for variation in combustion curvilinear integral inBV is (xI, R, yI, R) sampled point ATBV, calculate injection change curve integration inBV in each sampled point ATBVCorresponding crank axle angle xI, R2L, it is up to value y in this crank axle angleI, R, as shown in Figure 5.Based on crank axle angle xI, RWith crank axle angle xI, R2L, it is determined that sampled point ATBVRelevant firing delay is difference ZV (xI, R)=xI, R-xI, R2L, and with crank axle angle xI, RStore explicitly.It is derived from the first sub-change curve ZVVA1 of firing delay of firing delay change curve ZVV, as shown in Figure 7 A.
In the next step, each coordinate for injection change curve integration inEV is (xI, L, yI, L) orientation point ATEV, calculate in variation in combustion curvilinear integral inEV with each sampled point ATEVCorresponding crank axle angle xI, L2R, it is up to value y in this crank axle angleI, L, as shown in Figure 6.Based on crank axle angle xI, LWith crank axle angle xI, L2R, it is determined that orientation point ATEVRelevant firing delay is difference ZV (xI, L2R)=xI, L2R-xI, L, and with crank axle angle xI, L2RStore explicitly.Therefore, the numerical value of this step is to not only having identified time delay, it may have new corresponding crank axle angle, and it is no longer complies with original sampling axle.Therefore, postpone just to be converted into the curve of variation in combustion curvilinear integral.It is derived from the sub-change curve ZVVA2 of second point ignition delay of firing delay change curve ZVV, as shown in Figure 7 B.
Whole firing delay change curve ZVV is as shown in Figure 8.It is to draw with the form of the first firing delay change curve ZVVA1 and the merging data of the sub-change curve ZVVA2 of second point ignition delay, and includes rising edge 4a, 4b, 4c and vertical curve section 5a, 5b.Pass through interpolation, it is possible to arbitrary resolution calculates described firing delay change curve ZVV.
In the above-mentioned methods, the determination of firing delay change curve is based on the assumption that, it may be assumed that the after-combustion of each fuel meat elder generation, say, that, integration and normalized injection change curve define the time flow of fuel input, and variation in combustion curve constitutes the time flow that energy converts.In direct injection type electromotor, but there are many-sided parameter, the geometry of such as electromotor, turbulent parameters and other parameters can affect the diffusion of fuel, cause that some fuel bags being placed in combustion zone are not together burn with the neighbours on its " time " completely, but such as only just fed through to by process high temperature to when terminating close to whole burning very below and burn.In order to these (statistics) effects taken into account, said method is extended as follows in another kind of embodiment.
In the first step, each coordinate for variation in combustion curvilinear integral inBV is (xI, R, yI, R) sampled point ATBV, calculate the crank axle angle x in injection change curve integration inEVI, R2L, it is up to value a*y in this crank axle angleI, R, wherein, a is coefficient, is 0.9 in the present embodiment.Firing delay change ZVa(xI, R)=xI, R-xI, R2LIt is determined and for crank axle angle xI, RStored, so that it is determined that firing delay change curve ZVVaThe first sub-change curve.It addition, be each coordinate of variation in combustion curvilinear integral inBV be (xI, R, yI, R) sampled point ATBV, calculate the crank axle angle x in injection change curve integration inEVI, R2L, it is up to value a in this crank axle angle1*yI, R, wherein, a1For coefficient, it is 1.1 in the present embodiment.Firing delay ZVa1(xI, R)=xI, R-xI, R2LBy for crank axle angle xI, RAnd storing, so that it is determined that firing delay change curve ZVa1The first sub-change curve.Replacement scheme is, a and a1Can change over.
In a further step, each coordinate for injection change curve integration inEV is (xI, L, yI, L) orientation point ATEV, calculate the crank axle angle x in variation in combustion curvilinear integral inEVI, L2R, it is up to value a*y in this crank axle angleI, L.Firing delay ZVa(xI, L2R)=xI, L2R-xI, LIt is determined and for crank axle angle xI, L2RStored, so that it is determined that firing delay change curve ZVVaThe second sub-change curve.It addition, each coordinate for injection change curve integration inEV is (xI, L, yI, L) orientation point ATEV, calculate the crank axle angle x in injection change curve integration inEVI, R2L, it is up to value a in this crank axle angle1*yI, L.Described firing delay ZVa1(xI, L2R)=xI, L2R-xI, LBy for crank axle angle xI, L2RAnd storing, so that it is determined that firing delay change curve ZVVa1The second sub-change curve.
By by firing delay change curve ZVVaThe first subdivision and firing delay change curve ZVVaThe second subdivision combine, so that it may calculate firing delay change curve ZVVa, and by firing delay change curve ZVVa1The first subdivision and firing delay change curve ZVVa1The second subdivision combine, so that it may calculate firing delay change curve ZVVa1.At two firing delay change curve ZVVaWith ZVVa1Between constitute a band, this band represents a possible scope of firing delay change curve.For each crank axle angle, one " possible " firing delay scope just is assumed to be formed for this, it may be assumed that and the fuel droplets inputted in crank axle angle has ± and the part of 10% can exceed by it in other words by the drop exceeded about in combustion reaction for the moment.
The described method for determining firing delay change curve can be implemented for different injection change curves and the variation in combustion curve corresponding with injection change curve, in order to determines each corresponding firing delay change curve.Described firing delay change curve is collected and stores.
A general firing delay change curve model it is made up of these firing delay change curves.This firing delay change curve model can such as be stored with the form of two characteristic curves m, AB, as following by illustrated by Fig. 9 A to Fig. 9 C.Schematically showing firing delay change curve ZVV in figure 9 a, it has the minima B of three local1、B2、B3, these minima just represent the starting point of injection.Firing delay change curve ZVV and these minima B1、B2、B3There is rising edge 4a, 4b, 4c and vertical section 5a, 5b explicitly.
In order to constitute Article 1 characteristic curve AB, as shown in Figure 9 B, it is determined that described local minimum B1、B2、B3Coordinate in firing delay change curve ZVV, and record in a chart.This process to carry out for multiple firing delay change curves.Then, carrying out the interpolation of the coordinate of described minima, interpolation curve constitutes characteristic curve AB.
In order to constitute Article 2 characteristic curve m, as shown in Figure 9 C, it is determined that the slope m of rising edge 4a, 4b, 4c of described firing delay change curve1、m2、m3And the relatedness between crank axle angle.Described slope m1、m2、m3Value be according to crank axle angleIt is indicated.This process to carry out for multiple firing delay change curves.Then, carrying out the interpolation of the value of described slope, interpolation curve constitutes characteristic curve m.By the characteristic curve shown in Fig. 9 B and Fig. 9 C, arbitrary firing delay change curve can be derived.
Figure 10 illustrates a kind of for identifying the method 6 that fuel quality changes.In 60, it is determined that the firing delay change curve of internal combustion engine, as referring to figs. 1 through illustrated by 7.In 61, determine the difference between determined firing delay change curve (reality-firing delay change curve) and stored firing delay change curve (rated point ignition delay change curve), wherein, described stored firing delay change curve corresponds to such a injection change curve, and described injection change curve brings desired variation in combustion curve at the running status immovable situation lower aprons of internal combustion engine.In 62, based on the difference between the specified and actual ignition delay variation curve calculated, the change of fuel quality is identified.In 63 so that the shape of expulsion pressure, ER EGR Rate or cylinder charge degree and/or relevant injection change curve pattern is suitable with the fuel quality changed.
Figure 11 illustrates the method 7 of the control starting point of a kind of main injection BHE for carrying out feedforward internal combustion engine based on injection change curve integral model 82, wherein, as shown in Fig. 9 B and 9C, adopts a kind of firing delay model.When described method is illustrated, have references to Figure 12, the figure shows desired variation in combustion curvilinear integral 80, there is combustion centre VSP corresponding, desired and the injection change curve integral mode 82 planned.First, described jet mode defines, it is necessary to carry out how many son injection 81a, 81b, 81c, and described sub-injection 81a, 81b, 81c need to have which kind of interval each other and every height injection 81a, 81b, 81c need great emitted dose.May make up from which a kind of temporary transient, be integrated and normalized injection change curve (injection change curve integral mode 82), its absolute angular position not yet learns that it is not associated with desired variation in combustion curvilinear integral 80 in time in other words.Additionally, by Figure 13 A to Figure 13 C.Wherein, Figure 13 A illustrates variation in combustion curvilinear integral 80 and injection change curve integration 83, it is subjected to displacement relative to the injection change curve integral mode 82 shown in Figure 12, thus giving between variation in combustion curve 80 and injection change curve integration 83 temporal interrelated.Figure 13 B illustrates two characteristic curves AB, m, and it is corresponding with variation in combustion curvilinear integral 80, and Figure 13 C illustrates the reconstruct of expected firing delay change curve.
In 70, according to method 7, it is determined that the reference point RP in described variation in combustion curvilinear integral 80, the functional value of its functional value starting point equal to the main injection BHE in injection change curve integral mode 83.For this, for desired combustion centre VSP, the characteristic curve m from Figure 13 B reads slope mVSP。
Described slope mVSPBe defined as, as Figure 13 C indicate,
Because
Wherein,For the interval between angle position (or crank axle angle) and the angle position of reference point RP of combustion centre VSP,Be its functional value of mainly initial for injection BHE angle position and injection change curve integral mode functional value equal to the combustion centre VSP in variation in combustion curvilinear integral 80 spray site EP angle position between interval, ZVVSPFor the firing delay between combustion centre VSP and spray site EP, ZVBHEThe firing delay between reference point RP is initiateed for mainly spraying BHE.Based on slope mVSP, it may be determined that the crank axle angle of described reference point RPWherein:
Wherein,Crank axle angle for described combustion centre VSP.
In 71, calculate the firing delay ZV corresponding with described reference pointBHE, method is to read the value B on characteristic curve ABRPWith the value m on characteristic curve mRP。
In 72, calculating the starting point of main injection, this is by by firing delay 2VBHEAngle position from described reference point RPIn the mode that deducts or by by firing delay ZVBHEWithAnd angle position from described combustion centre VSPThe mode deducted realizes.
Reference numerals list
1 controls equipment
10 processors
11 storage devices
The signal input part of 12 variation in combustion curves
The signal input part of 13 injection change curves
2 for determining the method that firing delay changes
20 obtain variation in combustion curve
21 obtain injection change curve
22 calculate firing delay change curve
The edge of 4a-4c firing delay change curve
The curve section of 5a, 5b firing delay change curve
6 for identifying the method that fuel quality changes
60 determine firing delay change curve
61 calculated difference
62 changes identifying fuel quality
The correction of 63 combustion parameters
The method of the 7 control starting points mainly sprayed for the feedforward
70 determine reference point
71 calculate the firing delay corresponding with described reference point
72 determine that the control of main injection initiates
80 desired variation in combustion curvilinear integrals
81a, b, c sprays
82 injection change curve integral mode
83 injection change curve integrations
AB characteristic curve, represents the local minimum in firing delay
ATBVSampled point in normalized variation in combustion curvilinear integral
ATEVOrientation point in normalized injection change curve integration
B1-B3The local minimum of firing delay change curve
BRPThe slope minima of reference point
The starting point that BHE mainly sprays
Variation in combustion curve during BV cycle of operation
Angle interval between starting point and the starting point of burning of D injection
EP spray site
Injection change curve during EV cycle of operation
The normalized variation in combustion curvilinear integral of inBV
The normalized injection change curve integration of inEV
M characteristic curve, illustrates the slope in firing delay
m1-m3The slope at the edge of firing delay change curve
mBThe slope at the edge of firing delay change curve
mRPSlope in the crank axle angle of reference point
mVSPSlope in the crank axle angle of combustion centre
RP reference point
VSP combustion centre
xI, R, yI, RThe coordinate of sampled point
xI, P2L, yI, RThe coordinate of point corresponding with sampled point on injection change curve
xI, L, yI, LThe coordinate of orientation point
xI, L2R, yI, LThe coordinate of point corresponding with orientation point on variation in combustion curve
ZV firing delay
ZVBFiring delay in the local minimum of firing delay change curve
ZVBHEFiring delay between starting point and the reference point of main injection
ZVVSPFiring delay between combustion centre and spray site
ZV(xI, R) sampled point in variation in combustion curvilinear integral and the firing delay between point corresponding with described sampled point on injection change curve integration
ZV(xI, L2R) orientation point in injection change curve integration and the firing delay on variation in combustion curvilinear integral and between the corresponding point of described orientation point
ZVV firing delay change curve
The sub-change curve of ZVVA1 firing delay
The sub-change curve of ZVVA2 firing delay
Crank axle angle
Crank axle angle when injection starts
Crank axle angle when burning starts
The crank axle angle of combustion centre
Crank axle angle when main injection starts
Crank axle angle on reference point
Crank axle angle in spray site
Angle interval between starting point and the spray site of main injection
Angle interval between combustion centre and reference point
Claims (10)
1., for determining the method for firing delay change curve (ZVV) for internal combustion engine, described firing delay change curve represents that the energy input change curve of described internal combustion engine and energy convert between change curve delay in time, including:
The energy obtaining (20) described internal combustion engine converts change curve (BV)；
Obtain the energy input change curve (EV) of (21) described internal combustion engine；And
Change curve (BV) calculating (22) described firing delay change curve (ZVV) is converted based on described energy input change curve (EV) and based on described energy.
2. method according to claim 1, wherein, described energy converts change curve (BV) and/or described energy input change curve (EV) is based on multiple sampled point and constitutes, and includes: described sampled point and/or present the interpolation curve of described sampled point.
3. method according to claim 1 and 2, wherein, the calculating (22) of described firing delay change curve (ZVV) including:
The energy of the energy input change curve integration and described energy conversion change curve (BV) that constitute described energy input change curve (EV) converts change curve integration；And
Described energy input change curve integration and described energy are converted change curve integration be mutually adapted.
4. method according to claim 3, wherein, the calculating (22) of described firing delay change curve (ZVV) including:
Change curve point (AT is converted for multiple energy previously given, described sampled point especially convert change curve (BV) corresponding to described energyBV), calculate adaptive energy and convert the previously given energy conversion change curve point (AT of change curve integration (inBV)BV) to the first firing delay value (ZV (x of following point of adaptive energy input change curve integration (inEV)I, R)), the functional value of this point converts change curve point (AT equal to described energyBV) functional value (yI, R) with the product of coefficient a；And
The sub-change curve of the first firing delay (ZVVA1) is generated based on determined first firing delay value；And/or
For multiple previously given energy input change curve point (ATEV), it is determined that the previously given energy input change curve point (AT of adaptive energy input change curve integration (inEV)EV) the second point ignition delay value (ZV (x of the following point of change curve integration (inBV) is converted to adaptive energyI, L2R)), the functional value of this point is equal to described energy input change curve point (ATEV) functional value (yI, L) with the product of coefficient a；And
The sub-change curve of second point ignition delay (ZVVA2) is generated based on determined second point ignition delay value.
5. method according to claim 4, wherein, the determined first sub-change curve of firing delay and/or the determined sub-change curve of second point ignition delay and described adaptive energy input change curve integration (inEV) or described adaptive energy are converted change curve integration (inBV) relevant.
6. the method according to claim 4 or 5, wherein, for coefficient a, a=1.
7. the method according to claim 4 or 5, wherein, described method additionally includes:
Calculate other firing delay change curve, wherein, the coefficient a that the calculating of other firing delay change curve described is based on1It is different from described coefficient a；And
Firing delay change curve scope, especially wherein said coefficient a and/or described coefficient a is determined based on two firing delay change curves calculated1Change.
8. for identifying the method that fuel quality changes, including
Determine the firing delay change curve (ZVV) of (60) internal combustion engine, especially according to method according to any one of claim 1 to 7 (2)；
Calculate the difference between (61) determined firing delay change curve (ZVV) and stored firing delay change curve；And
Change based on difference identification (62) fuel quality calculated.
9. for a method for the absolute position of energy input change curve pattern (82) of feedforward internal combustion engine, including:
Determine that the energy that (70) convert change curve (BV) at previously given energy converts the reference point (RP) in change curve integration (80)；
Based on firing delay change curve (ZVV), especially one according to the determined firing delay change curve of method according to any one of claim 1 to 7, calculate the firing delay (ZV that (71) are corresponding with described reference pointBHE)；And
Based on described reference point (RP), the firing delay (ZV that calculatesBHE) and combustion centre's rated value (VSP), it is determined that (72) absolute position of described energy input change curve pattern (82).
10. for determining a control equipment for the internal combustion engine of the firing delay change curve (ZVV) of internal combustion engine, wherein, described control equipment (1) designed to be used execution method according to any one of claim 1 to 9.
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| JP2023063153A (en) * | 2021-10-22 | 2023-05-09 | 株式会社トランストロン | Engine control device, engine control method, and engine control program |
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