EP0151768B1 - Système de dosage du mélange air-carburant pour un moteur à combustion - Google Patents

Système de dosage du mélange air-carburant pour un moteur à combustion Download PDF

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Publication number
EP0151768B1
EP0151768B1 EP84115723A EP84115723A EP0151768B1 EP 0151768 B1 EP0151768 B1 EP 0151768B1 EP 84115723 A EP84115723 A EP 84115723A EP 84115723 A EP84115723 A EP 84115723A EP 0151768 B1 EP0151768 B1 EP 0151768B1
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EP
European Patent Office
Prior art keywords
control
combustion engine
map
air
internal combustion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
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EP84115723A
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German (de)
English (en)
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EP0151768A3 (en
EP0151768A2 (fr
Inventor
Eberhard Dipl-Ing. Blöcher
Ferdinand Dipl-Ing. Grob
Peter-Jürgen Dipl.-Ing. Schmidt
Manfred Dipl.-Ing. Schmitt
Josef Dipl.-Ing. Wahl
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Robert Bosch GmbH
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Robert Bosch GmbH
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Priority to AT84115723T priority Critical patent/ATE38412T1/de
Publication of EP0151768A2 publication Critical patent/EP0151768A2/fr
Publication of EP0151768A3 publication Critical patent/EP0151768A3/de
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Publication of EP0151768B1 publication Critical patent/EP0151768B1/fr
Expired legal-status Critical Current

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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
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
    • F02D41/2496—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories the memory being part of a closed loop
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
    • F02D41/1408—Dithering techniques
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
    • F02D41/2409—Addressing techniques specially adapted therefor
    • F02D41/2422—Selective use of one or more tables
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
    • F02D41/2425—Particular ways of programming the data
    • F02D41/2429—Methods of calibrating or learning
    • F02D41/2451—Methods of calibrating or learning characterised by what is learned or calibrated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
    • F02D41/2425—Particular ways of programming the data
    • F02D41/2429—Methods of calibrating or learning
    • F02D41/2438—Active learning methods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
    • F02D41/2425—Particular ways of programming the data
    • F02D41/2429—Methods of calibrating or learning
    • F02D41/2451—Methods of calibrating or learning characterised by what is learned or calibrated
    • F02D41/2464—Characteristics of actuators

Definitions

  • the invention is based on a device for fuel-air mixture metering for an internal combustion engine according to the preamble of claim 1.
  • a device for regulating operating parameters of an internal combustion engine to optimum values is known.
  • the machine variables such as B. the mixture metering or the ignition timing precontrolled and varied at selectable times, the corresponding reaction of the internal combustion engine to this variation being used to determine, for example, the optimum performance or the minimum, specific fuel consumption.
  • This known device thus includes a pilot control, for example the fuel metering with a superimposed control, which corrects the unavoidable errors in the dimensioning of the pilot control values.
  • An advantageous embodiment of the invention consists in using an extreme value control as a control loop for adapting the pilot control values. It has proven to be particularly advantageous here for the various control methods to either superimpose the supplied air or fuel quantity with test signals, i. H. to sweep and to use the phase relationship between the test signal and the bandpass output signal for control purposes.
  • these various control methods can be implemented by regulating the mixture metering of the internal combustion engine to the air ratio ⁇ . It has been shown that storing the setpoints for the air ratio ⁇ in a map is very favorable.
  • control methods which are partially described below, are generally used, which enables the use of simple and inexpensive sensors and actuators, guarantees freedom from maintenance and increases long-term stability. Variations of specimens can also be neglected, interchangeability of, for example, encoders is ensured and the facility can be adapted more easily to different motor types.
  • the use of controls also results in functional improvements such as the optimization of the operating behavior of the internal combustion engine in the start, warm-up and idle phases and in the full-load range. The same applies to transient phases of the internal combustion engine, for example during acceleration or overrun.
  • control systems allow a very fast adaptation to changed input conditions.
  • the disturbance variables can only be taken into account incompletely or with considerable effort.
  • FIG. 1a a characteristic field of an Otto engine is shown in FIG.
  • control is based on a minimum specific fuel consumption of the internal combustion engine, i.e. on a maximum of the curves shown in dashed lines in FIG. 1a (be min control ).
  • a power maximum that is controlled to a maximum of the solid lines in Figure 1a illustrated curves (p max scheme). Since in both cases the setpoint is given by a maximum of the power output of the internal combustion engine for a given force of material or air quantity, an extreme value control is appropriate.
  • a lambda map control is also conceivable, with which the corresponding lambda values of the air-fuel mixture are specified as a function of the power output of the internal combustion engine.
  • Control systems for an internal combustion engine can react relatively slowly to disturbances due to the existing dead times or running times. It has therefore proven to be extremely advantageous to use a pilot control for the fast and dynamic processes within an internal combustion engine.
  • the superimposed control can intervene, for example, multiplicatively or additively on these pilot control values.
  • Modern electronic means for example memories and microcomputers
  • the superimposed control can then, on the one hand, influence the read map values multiplicatively or additively without changing the map values stored in the memory.
  • the basic structure of the system uses a map, the input variables of which in the simplest case are the speed n and the throttle valve position a.
  • a map the input variables of which in the simplest case are the speed n and the throttle valve position a.
  • An ongoing adjustment then takes place during operation.
  • An essential concept is to subdivide the map into different areas, for example idling, part-load, full-load and thrust areas. With the exception of push operation, a certain control concept is provided in each area, which adapts this area to the respective requirements, so that a "learning" map is available. If the motor vehicle is taken out of operation, it is possible to save the map learned last and to use it as the initial map again when starting again.
  • FIG. 2 shows the block diagram of a first embodiment of the overall system.
  • the fuel quantity to be metered to the internal combustion engine is controlled via a characteristic diagram 20, to which the speed n and the throttle valve position a of a throttle valve 21 are fed as input variables.
  • the throttle valve is actuated by an accelerator pedal 22.
  • the injection time t stored in the map 20 is converted into a corresponding fuel quantity Q K via an injection valve 23.
  • This amount of fuel Q K as well as the amount of air CIL determined by the throttle valve position, are fed to a symbolically illustrated internal combustion engine 24, a certain torque M being effected as a function of the lambda value of the lift / fuel mixture.
  • the controlled system "internal combustion engine” can be roughly approximated by an integrator 25.
  • the output variable n of the internal combustion engine is used to control the characteristic diagram 20. This part of the overall system described so far is a pure control of the mixture composition.
  • the superimposed control is based on extreme value control.
  • the air quantity Q L for example via a bypass with a stroke ⁇ Q L, or the injection time t; with a stroke i ßt wobbled.
  • the test signals required for this purpose are generated by a test signal generator 26.
  • This test signal generator acts on the amount of fuel or air, depending on the control method, the wobble frequency being able to be chosen to be constant or depending on the speed.
  • the torque changes of the internal combustion engine generated by the test signal have an effect on changes in speed, so that these changes in torque can be analyzed by a measuring device 27 which receives signals proportional to the speed.
  • the measuring device 27 consists of a preferably digital filter 28 and a subsequent evaluation unit 29 which examines the filtered signal in terms of magnitude and / or phase and compares it with the output signals of the test signal generator 26. It has proven to be advantageous to construct the filter 28 using digital technology. It works in a time-discrete manner, and the sampling rate can be either in a fixed time pattern or proportional to the speed. Since the filter is precisely matched to the sweep frequency, interference signals can be largely suppressed.
  • a controller 30 compares preferably the phase position of the filter output signal and a phase setpoint, the difference between these two signals being fed to an integrator 31, which in the simplest case can be designed as an up-down counter.
  • the output signal of this integrator 31 can be used for a multiplicative influencing of the characteristic diagram.
  • map learning methods can also be useful, in which individual areas of the map are specifically adapted. Such methods are shown schematically by block 32.
  • the average useful pressure Pe is plotted in FIG. 3 as a function of the lambda value of the air / fuel mixture.
  • a test signal is superimposed on the input variable, the air-fuel mixture with a predetermined lambda value, which either occurs sporadically and, for example, takes the form of a staircase function or occurs periodically and has a sine or rectangular shape.
  • the reaction of the internal combustion engine to these test signals can be detected via the change in the average useful pressure p e , but particularly advantageously via the change in torque or the associated change in speed.
  • the variable to be analyzed is either the change in the amplitude of the mean useful pressure (or the torque or the rotational speed) or the phase of this output variable in relation to the phase of the test signals.
  • test signal is superimposed on the input variable by air wobble for example via a bypass and, in the case of the Pmax control, via a wobble of the quantity of fuel to be metered or the injection time.
  • a rough precontrol of the lambda value of the air / fuel mixture is specified via the throttle valve 21 and via the on map 20 for the injection time.
  • the superimposed control comprises a test signal generator 26, a measuring device 27 evaluating the changes in speed and a controller 30 which influences the characteristic diagram 20.
  • the quantity of air to be metered is wobbled by ⁇ Q L or the quantity of fuel to be metered, for example via the change in injection time ⁇ t.
  • FIG. 2 is to be understood in such a way that the signals of the test signal generator 26 influence either the amount of air to be metered or the amount of fuel to be metered, depending on the load condition.
  • a measuring device 27 which, in the present special case, consists of a digital filter 28 for suppressing interference frequencies and an evaluation unit 29 which evaluates the speed changes in terms of the amount and the phase.
  • the output signal of the bandpass filter is plotted in FIG. 4 to clarify the functioning of the evaluation unit 29, namely the amplitude as a function of lambda in the upper part and the phase position for two lambda values above and below the ideal value, the be min point, in the lower part , on which the figure 4 was specialized.
  • the conditions would result in the same way for a regulation to power maximum P max , only the lambda value being in the rich range.
  • the output amplitude of the bandpass is a measure of the size of the speed changes. According to the representations of FIG. 3, the change in the output amplitude of the bandpass assumes the value 0 precisely in the extreme value. Deviating from the optimal value on both sides, the amplitude increases steadily. However, the value of the amplitude alone does not tell you which side of the extreme value you are on. The extreme value is therefore determined by evaluating the phase of the output signal of the filter 28. It would also be possible to use the change in amplitude as a measured variable.
  • a test signal of an arbitrary, here rectangular shape is plotted, and in comparison the output variable of the filter.
  • the output signal of the filter has a different phase shift with respect to the test signal. Depending on the phase position, this can be used to clearly determine whether the mixture is too rich or too lean in relation to the be min point.
  • a comparison now takes place between the phase position of the output signal of the filter 28 and a phase setpoint for the be min point.
  • the difference between these two signals is integrated in the simplest case, for which purpose, for example, an up-down counter can be used in a digital embodiment.
  • the counter reading corresponds to a factor by which the injection map is multiplied or a certain map area is modified.
  • the air has to be wobbled, so that due to the large distance between the bypass on the throttle valve, with which the amount of air is wobbled, and the cylinders, run times are created by which the wobble frequency is limited. Due to the presence of vehicle-specific resonance frequencies, the phase setpoint for the be min point can be shifted depending on the speed and possibly also on the load.
  • a P max control is provided for the upper load range; it should ensure that the internal combustion engine always delivers the maximum possible power for the given throttle valve position under high load. In this case, however, it is not the air but the amount of fuel that is swept, for example, over the injection time.
  • the measuring device and the controller are constructed identically.
  • the runtimes are considerably shorter than those of the be min control .
  • the runtimes are considerably shorter than those of the be min control .
  • at least two pulses must always be enriched and emaciated. This results in the highest possible wobble frequency, which is about a factor of four above the wobble frequency of the be min control .
  • the filter 28 is of course also adapted accordingly.
  • FIG. 5 A second exemplary embodiment of the overall system, in which the extreme value control superimposed on the precontrol is replaced by a lambda control, is shown in FIG. Blocks identical to FIG. 2 have been given the same numbers and are not explained in more detail below.
  • the difference between the subject of FIG. 5 and that of FIG. 2 lies in the fact that the influence on the characteristic diagram 20, in which the injection times t; in dependence on the throttle valve position a and the speed n are stored, starting from the output signals of an oxygen probe exposed to the exhaust gas of the internal combustion engine.
  • the measuring device 27 consists of a desired lambda map 36, to which the throttle valve position and the rotational speed n are supplied as input variables, and a conditioning circuit 35, to which the oxygen probe (not shown in more detail) is connected.
  • the subject of FIG. 5 remains not only limited to oxygen probes, but also encompasses any type of exhaust gas sensors, such as are known, for example, as CO probes or also exhaust gas temperature probes.
  • Predetermined fixed values for the lambda value for the most varied driving situations of an internal combustion engine are stored in the desired lambda map as a function of the parameters throttle valve position a and speed n.
  • these lambda setpoints which in the simplest case assume the value ⁇ ⁇ 1
  • the series connection from the blocks 31 and 32 is applied, which in turn either act globally on the map 20 in a multiplicative way or specifically influence certain operating parameter-dependent map areas.
  • the following default setting which can of course change from one vehicle type to another, can be specified as a rough guide value for the lambda target map 36.
  • This second exemplary embodiment has the advantage over the first exemplary embodiment in FIG. 2 that the electronic and mechanical outlay for the control superimposed on the pilot control is kept within limits.
  • the measuring device 27 with the processing circuit 35 and the desired lambda map 36 is relatively inexpensive.
  • a very precise and balanced presetting of the map values of the desired lambda map is required, which can also assume different values for different types of internal combustion engines.
  • an idling charge control can advantageously be used, with which the LL speed of the internal combustion engine is independent of load changes, such as, for example, by switching on the air conditioning system or similar are caused, is kept constant.
  • Such an idle charge control is known for example from the applicant's German published application DE-OS-3 120 667.
  • FIG. 6 b shows a map learning method in which the individual map values of the map are continuously adapted by the superimposed control. More precisely, this means that at each operating point specified by the input variables, the associated map output variable is adapted to the respective optimum value by a control method. When leaving the respective operating point, the last determined output variable is saved and remains unchanged until this operating point is selected again.
  • An advantage of this method is that the map can be adapted to any structure. The fact that all map output variables have to be controlled individually in order to change the entire map is not so advantageous. However, this is not always guaranteed since, on the one hand, different operating points are controlled very rarely or never and, on the other hand, because the dwell time in the individual operating points is often so short that no adjustment can be made.
  • FIG. 7 shows a section through a histogram-like actual value map with the corresponding target values identified by a solid line.
  • the adaptation of individual values is shown in FIG. 7a, the controlled output variable being identified by an arrow.
  • this individual value is correctly adjusted by the control system according to the setpoint curve, the structure of the actual value map curve can only track the setpoint after all map values have been approached.
  • FIG. 7c The other extreme case, namely that of a multiplicative adaptation of the overall map, is shown in FIG. 7c.
  • a factor is obtained from the deviation of the map size indicated by an arrow from the target value, which adapts the corresponding map value correctly, but changes all other map values in the same sense.
  • the desired setpoint curve of the map cannot be exactly achieved with such a multiplicative adjustment.
  • One possibility is to subdivide the map into support points. In the simplest case, intermediate values are calculated, for example, by linear interpolation. When the map is adapted to the corresponding target value, only the support points are changed, so that the surrounding areas are adjusted by the interpolation.
  • the environment of the changed support point value is automatically changed in the same sense as the support point itself, but weighted less with increasing distance from the support point.
  • this map learning method it is not necessary to approach each individual map size in order to change it. This means that, on the one hand, the characteristic map can be adapted quickly and, on the other hand, any given structure can be adapted at least approximately.
  • the characteristic diagram 20 for the injection time is controlled by the input variables speed n and throttle valve position a as load information.
  • the mixture is to be set to a predetermined lambda value by means of a lambda control.
  • a controller with, for example, I behavior determines a factor by which the injection time is multiplied.
  • this controller can be identified with block 31.
  • This multiplication factor acts continuously, the controller being designed so that the control time constant is as small as possible.
  • the map is influenced as a function of this factor. Due to the system-related runtimes, the control factor is not always constant, even in stationary operation, but shows time fluctuations.
  • FIG. 8 should be used to explain the advantages of such averaging.
  • interpolation point values S1, S2, S3 have been plotted here, which also assume the same values.
  • the bold actual value characteristic curve therefore assumes the shape of a straight line.
  • the setpoint characteristic curve shown in broken lines deviates considerably from the course of the actual value characteristic.
  • a support point intake area is defined around each of the support points, which in the present special case corresponds to half the distance between two support points, as indicated for support point S2 in the drawing.
  • Each support point can only be changed if one or more working points in the catchment area of this support point are activated.
  • the desired and actual value can only be reached in this operating point if the interpolation point value S2 is raised from its initial value E to the new value A. If, on the other hand, one starts from the working point 11, the interpolation point value S2 must be raised to the value D, so that the desired and actual value match for the working point II. In both cases the base did not assume its correct value, which should be B. On the one hand, this clear illustration shows that the adaptation is better the closer the working point is to the support point, and on the other hand that with a single working point in the catchment area of the respective support point, it cannot always be adapted exactly.
  • FIG. 9 shows a section from any map.
  • the input variables in the present case the speed n and the throttle valve position a, are quantized and each combination of these input variables is assigned an output variable, here the injection time t.
  • the output variables are stored in a read-write memory, the input variables each determining the address within the memory.
  • a map with 3 x 3 support points was selected as a simple example, which are marked with dots in the figure. Linear interpolation can be used to calculate three intermediate values between two interpolation points, so that a total of 81 map values result for the special case selected here.
  • the lower part of FIG. 10 shows the clear course of the control factor (solid line) in the period between t a and t b and the time-averaged control factor (dashed line).
  • the averaging process now proceeds as follows. If the driving curve from the catchment area of a support point changes to another catchment area (at time t a , t b ), the support point of the catchment area just left is adjusted if necessary and the control factor is reset to the neutral value one.
  • the control factor is averaged at the point in time at which the driving curve lies in the catchment area of a support point. It can prove to be advantageous that the averaging only starts after a certain number of revolutions of the internal combustion engine (for example 16 revolutions).
  • a first-order digital low-pass filter in particular, is used for the averaging. If the driving curve leaves the relevant catchment area, this averaged value is wholly or possibly only partially incorporated into the support point and then the control factor is set to the neutral value one.
  • a characteristic of this learning process is the fact that the properties of the existing control loop remain unchanged.
  • the control factor continues to directly influence the manipulated variable within a reference point environment. Only after a clear change tendency has been detected by averaging several correction values within a base area, is the change incorporated into the associated base when leaving this base area.
  • the interpolation process results in a jump in the manipulated variable, which, however, does not have a disruptive effect. It can prove useful to use a calculation method to reset the control factor in such a way that a jump is avoided.
  • a change limit which uses the original state of the map as a reference, ensures that even in the event of a fault, an "operational" map is always retained. At the same time, a warning can be issued when the limitation is activated, since there is a high probability that there is a serious defect within the control loop or on the motor.
  • the map in the original state also enables a comfortable emergency operation function.
  • a component 41 which is preferably designed as an integrator in the present exemplary embodiment.
  • the output signals of this component 41 have a multiplicative influence on the output variable t i of the map 20.
  • they serve to control an average value generator 42, which in turn influences the individual map or reference point values of the map 20 on the output side.
  • the connection between the average value generator 42 and the Map 20 can be interrupted by a switch S1.
  • the two blocks mean value images 42 and the component 41, which is preferably designed as an integrator, can be set to predetermined initial values A o and B o via further switches S2 and S3.
  • the switches S1, S2 and S3 are controlled by a range detection 43, to which the throttle valve position a and the rotational speed n of the internal combustion engine are supplied as input variables.
  • throttle valve position a and speed n for characterizing the operating state of the internal combustion engine have an exemplary character.
  • Other parameters, such as the intake pipe pressure, the air volume, the air mass or the exhaust gas temperature are conceivable as input variables.
  • a catchment area is defined for each support point.
  • the correction factor is averaged in the mean value image 42, possibly after a speed-dependent delay time, but the map is not influenced.
  • the value output from the map 20 is permanently influenced by the output signal of the controller 30.
  • the area detection detects this and actuates the three switches S1, S2 and S3.
  • the averaged correction value can be incorporated into the last point to be controlled.
  • the switches S2 and S3 reset the mean value milder 42 and the component 41 to initial values, namely A o and B o . This learning process can be carried out in the same way for the next support point that has been approached.
  • a map for the injection times t is shown in FIG. 12; (in milliseconds), the throttle valve position a (in degrees) and the speed of the internal combustion engine (in revolutions per minute) serving as input variables.
  • the map consists of 8 x 8 support points, namely eight speed and eight throttle valve positions.
  • the 64 values for the output variable t; are stored, for example, in a read-write memory and can be changed using the control methods already described above (be min -, P max control ) in the corresponding areas identified by different hatching. For small throttle valve angles and speeds below approx. 1,000 revolutions per minute, the speed is regulated by means of an idle control with a superimposed be min control .
  • various enrichment functions such. B. the warm-up or acceleration enrichment is provided.
  • the mixture is enriched by means of a temperature-dependent warm-up characteristic curve, whereby the characteristic diagram itself remains unaffected.
  • a temporary change in the wetting of the intake manifold wall must be compensated.
  • the short-term mismatch resulting from this can be corrected by increasing the fuel quantity by a factor which corresponds to the change in the position of the throttle valve over time. Because the throttle valve position is used as an input variable for the acceleration enrichment, this enrichment responds very quickly.
  • the hardware circuitry for carrying out an a-n mixture pre-control with a superimposed, adaptive control by means of a microcomputer (for example INTEL 8051) and the associated peripherals is shown schematically in FIG.
  • a microcomputer 50 the components CPU 51, ROM 52, RAM 53, timer 54, first input / output unit 55 and second input / output unit 56 are connected to one another via an address and a data bus 57.
  • An oscillator 58 is used to time the program sequence in the microcomputer 50, which is connected on the one hand directly to the CPU 51 and on the other hand via a divider 59 to the timer 54.
  • the signals of an exhaust gas probe 63 of a speed sensor 64 and of a reference mark sensor 65 are fed to the first input / output unit 55 via conditioning circuits 60, 61 and 62.
  • the battery voltage 66, the throttle valve position 67, the cooling water temperature 68 and the output signal of a torque transmitter 69 serve as further input variables, which are supplied to a series circuit comprising a multiplexer 74 and an analog-digital converter 75 via associated conditioning circuits 70, 71, 72 and 73.
  • the outputs of the analog-digital converter 75 are connected to the bus 57.
  • the function of the multiplexer 74 and the analog-to-digital converter 75 can be implemented, for example, by the 0809 module from National Semiconducters.
  • the multiplexer 74 is controlled via a line 76 starting from the first input / output unit 55.
  • the second input / output unit 56 controls an air bypass 79 and injection valves 80 via power output stages 77 and 78. Further output signals of this input / output unit 56 can be used for diagnostic purposes or for ignition control.
  • the exhaust gas probe 63, the conditioning circuit 60, the torque transmitter 69 and the conditioning circuit 73 can be omitted for extreme value control for minimum fuel consumption or maximum performance by wobbling the air bypass 79 or the amount of fuel (injection valves 80). If the air ratio lambda is controlled instead of this extreme value control, the torque transmitter 69, the conditioning circuit 73, the output stage 77 and the air bypass 79 can be dispensed with.
  • the torque transmitter 69 including the conditioning circuit 73 is necessary for a modified control method to be described.
  • the extreme value regulation to the minimum consumption be min requires wobbling of the air, for example via an air bypass, which bridges the throttle valve.
  • the air mixture requires a certain amount of time to pass through the relatively long distance between the bypass and the individual cylinders, due to this Running times limit the frequency of air wobble and the regulation is therefore relatively slow.
  • the amount of fuel can be wobbled at a relatively high frequency, since the injection valves are arranged directly on the combustion chamber and runtime effects are thereby negligible.
  • various methods are now to be disclosed in which a control to a consumption minimum can be implemented as a test signal using the fuel wobble. An additional advantage of this method results from the elimination of the air bypass.
  • FIG. 14 shows on the one hand the torque M of an internal combustion engine plotted over the uncorrected injection time t in FIG. 14a
  • FIG. 14b shows the efficiency ⁇ or the specific fuel consumption plotted over the uncorrected injection time t
  • the curve shown in FIG. 14a of the torque at constant air volume and speed can be derived from the solid lines in FIG. 1, the injection time serving as the abscissa instead of the lambda value of the mixture. Since the quotient of torque M and injection time t corresponds to the efficiency, the drawn tangent m indicates the maximum of the efficiency or the minimum of the specific fuel consumption.
  • the corresponding curves for efficiency and specific fuel consumption are shown in FIG. 14b.
  • a shift in the zero point for example, by means of offset voltages immediately means a shift in the calculated maximum. It proves advantageous that the air bypass for wobbling the amount of air sucked in can be omitted for this control method. Basically, this principle of wobbling the injection time can also be used for other mixture metering systems that do not necessarily derive their input variables from the speed and throttle valve position.
  • the slope of the torque curve can be determined according to FIG. 14a. If, on the other hand, you have measured the slope for the be min point in the individual operating points of the internal combustion engine and stored it, for example, as a setpoint in a memory, then a control can be set up using a setpoint / actual value comparison. However, with this method it is also possible to regulate to operating points by specifying other setpoints that do not correspond to the bemin value.
  • the moment of inertia 6 is included in the calculation of the slope.
  • the influence on the calculated slope is generally very small in vehicles with torque converters. The influence cannot always be neglected in vehicles with a manual transmission.
  • a simple possibility is to determine the injection map only in one gear, for example the highest gear, and to assume that the other gear ratios are given.
  • the equation applies exactly only on the assumption of a constant load torque W, the error resulting from small changes in the load torque can be neglected to a good approximation under normal operating conditions of the internal combustion engine.
  • the map is, as already described in Figure 12, depending on the input variables such.
  • B. the throttle valve position a and the speed n divided into different areas, namely idling, thrust, part load and full load.
  • the design is also based on the intention of avoiding wobbling of the air volume for the min control in the part-load range. To do this, the Map values of the pilot control in the full load range are adjusted so that the engine works at maximum power.
  • the air ratio is then, just like for the idling range, at values ⁇ ⁇ 1.
  • the map values are adapted to the consumption minimum be min .
  • the amount of fuel is reduced to very small values or to zero.
  • the throttle valve position is not a direct measure of the amount of air, changes in air pressure and temperature are directly incorporated into the lambda value of the mixture supplied to the internal combustion engine.
  • the pre-control values for the fuel quantity supplied to the internal combustion engine stored in the characteristic diagram must therefore be corrected by a superimposed control so that the lambda value can be set accordingly.
  • a particularly simple control method is a control for maximum power, which is only effective in the full load range, except in the idling range.
  • the controller generates a factor by which the changes in the intake air quantity due to pressure or temperature fluctuations are taken into account.
  • This factor which is only determined in the full-load range, naturally also applies approximately to the map values of the partial-load range. For this reason, it makes sense to record this factor during the transition to the partial load range and to let it work in this area as well. Seen overall, this control factor influences the entire partial load and full load range, but is only determined when the internal combustion engine is operating at full load.
  • FIG. 1 A block diagram of the control circuit is shown in FIG. Components identical to FIGS. 2 and 5 are also identified by the same numbers. Only the deviation or innovation is described below. Since in the present case it is only a matter of regulating the maximum power, the test signal generator 26 acts via a summation point 80 and a multiplication point 81 solely on the injection times t read out from the characteristic diagram 20. Since two injection pulses are greased and leaned alternately, there is a speed-dependent influence. The controller 30, to which the output signals of the measuring device 27 are fed, has a multiplicative influence on the value read from the characteristic map via the switch 52 in the case of full load.
  • This controller works with a time constant that is as small as possible, with averaging at the same time using a mean value plot 82.
  • the controller 30 is switched off, the switch 52 is opened and the switch 51 is closed.
  • the control factor stored by the mean value generator 82 becomes effective in the partial load range, specifically in such a way that the injection times t; be influenced multiplicatively.
  • idle mode there is also a regulation to the maximum power, so that controller 31 can also be used here in connection with switch 52. If the respectively required switching or switching-off processes of the controller are solved by software, the area detection stage 83 has essentially symbolic meaning.
  • the characteristic map values of the injection time t Adapt to the changing operating conditions of the internal combustion engine for the partial load range by means of a full load control.
  • FIG. 16 shows a section of the map in FIG. 12.
  • the control for maximum output detects whether this preselected injection quantity corresponds to the maximum output in this operating range of the internal combustion engine. If there is a deviation that can be attributed to changed air temperatures or pressures compared to the normal state, a factor is determined that does justice to this change. This factor is applied to the characteristic map values t in accordance with the previously described method ; attached for the partial load range.
  • the power output of the internal combustion engine should not change due to the calibration process.
  • the control factor is determined only on a part of the cylinders of the internal combustion engine.
  • separately controllable injection valves are a prerequisite for this.
  • Some of the cylinders are switched to a maximum power control as described, but for the remaining cylinders the injection time is reduced to such an extent that the total power remains constant on average.
  • the determined control factor can now be applied to all cylinders. However, it can also be expedient to repeat the process with the remaining cylinders and then to use a control factor averaged over the cylinders.
  • FIG. 17 An exemplary embodiment of this control method is shown in FIG. 17, the blocks identical to FIG. 15 being designated by the same numbers and also not being explained in more detail.
  • the injection valves are divided into two groups 23 and 23 '. Accordingly, there are also two multiplication points 81 and 81 'for the map values supplied to the two valve groups 23 and 23'. As already described, these multiplication points 81 and 81 'are controlled via the summation point 80 either by the controller 30 or by the mean value generator 82.
  • the valve group 23 with the increased map values for full load and the valve group 23 'with the reduced map values are activated to maintain an overall constant performance.
  • a control circuit 90 which is sensitive to changes in speed, can compensate for them.
  • a switch S4 is closed, so that the control circuit 90 acts on the valve group 23 'via the switch S4 and the multiplication point 81'.
  • this switch S4 is opened and a switch S3 is closed, so that the addition point 80 is conductively connected to the multiplication points 81 and 81 '.
  • the second possibility for keeping the power output of the internal combustion engine constant during a calibration process is indicated by means of an ignition system 91 connected to the characteristic diagram 20.
  • an ignition system 91 connected to the characteristic diagram 20.
  • a value for the withdrawal of the ignition angle of the internal combustion engine can then be stored in the map instead of the reduced value for the injection time.
  • the invention is not limited to fuel metering systems in which an intermittent injection, that is to say metering, is carried out over the opening period of the injection valves. It can also be used in an equally advantageous manner on electronically controlled injection systems with a continuous injection, such as is implemented in K or KE Jetronic systems, for example.
  • the fuel is injected via a flow divider and the corresponding injection valves.
  • the control piston of the flow divider is adjusted by electrohydraulic pressure actuators known per se.
  • the pressure actuator is controlled by an electronic control unit, the main control variables of which are given by speed and load information (air mass, air volume, intake manifold pressure, throttle valve position).
  • speed and load information air mass, air volume, intake manifold pressure, throttle valve position.
  • a throttle valve speed pre-control by means of a map with a fine adjustment by a superimposed control.
  • the absolute values of the characteristic map sizes for a continuous injection must differ from those for intermittent injection, since either the injection quantities per stroke or per time unit are used as a basis.
  • the following functions influencing the mixture metering must be fulfilled by the control unit: acceleration enrichment, full load enrichment, partial load reduction, lambda control, height correction reduction.
  • the control methods already described, for example lambda controls or extreme value controls for regulating, for example, the consumption minimum, the maximum output or the smoothness of operation come into consideration as controls superimposed on the pilot control.
  • the subject of the invention can also be applied to self-igniting internal combustion engines.
  • the speed input and the accelerator pedal position instead of the throttle valve position can then be used as the characteristic input variable.
  • the described exemplary embodiments can be readily transferred to self-igniting internal combustion engines by a person skilled in the art in the field of mixture metering for internal combustion engines.

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  • Engineering & Computer Science (AREA)
  • 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)
  • Feeding And Controlling Fuel (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Claims (8)

1. Installation de dosage du mélange carburant-air destiné à un moteur à combustion interne, installation comportant un champ de caractéristiques défini par des grandeurs de fonctionnement du moteur à combustion interne pour assurer la commande par anticipation des variables au moteur influençant le mélange carburant-air et une installation de régulation sensible à au moins l'une des grandeurs de fonctionnement pour influencer les grandeurs du champ des caractéristiques dans le sens de la correction, installation dans laquelle les grandeurs du champ de caractéristiques inscrites dans le champ des caractéristiques sont choisies suivant les grandeurs de fonctionnement du moteur à combustion interne et sont modifiées pour influencer différents procédés de régulation dans le sens de la correction à savoir une régulation à la consommation spécifique minimale de carburant (régulation de bemin) dans la plage des charges inférieures ou charges partielles ainsi qu'une régulation en fonction de la puissance maximale (régulation de type Pmax) dans la plage supérieure de la charge maximale, installation dans laquelle les signaux d'essais générés par les différents procédés de régulation travaillant sur le principe d'une régulation par les valeurs extrêmes et de régulation de la puissance maximale (régulation de type Pmax) sont fournis par un générateur de signaux d'essai (24), et sont combinés au signal de dosage de carburant et avec analyse de la réaction du moteur à combustion interne à ces signaux d'essai, analyse qui se fait par l'application d'une bande passante numérique, installation caractérisée en ce que l'on utilise le déphasage entre le signal d'essai et le signal de sortie de bande passante à des fins de régulation.
2. Installation selon la revendication 1, caractérisée en ce que la fréquence de résonance du filtre à bande passante numérique est soit variable de manière proportionnelle à la vitesse de rotation, soit constante.
3. Installation selon des revendications 1 et 2, caractérisée en ce que les différents procédés de régulation à savoir la régulation sur une consommation spécifique minimale de carburant, soit sur une puissance maximale reposent sur une régulation directe du coefficient d'air (λ).
4. Installation selon l'une des revendications 1 à 3, caractérisée en ce que la sonde de mesure est une sonde de gaz d'échappement particulièrement sensible à la fraction d'oxygène contenue dans les gaz d'échappement.
5. Installation selon la revendication 4, caractérisée en ce que la sonde de gaz d'échappement est une sonde d'appauvrissement, connue en soi.
6. installation selon la revendication 5, caractérisée en ce que la sonde d'appauvrissement peut être chauffée en fonction de différents paramètres de fonctionnement du moteur à combustion interne.
7. Installation selon l'une des revendications 1 à 6, caractérisée en ce que les grandeurs de consigne du coefficient d'air (λ) sont inscrites dans un champ de caractéristiques (36) en fonction des paramètres de fonctionnement du moteur à combustion interne comme par exemple la vitesse de rotation et le champ de caractéristiques.
8. Installation selon la revendication 7, caractérisée en ce que les grandeurs du coefficient Lambda inscrites dans le champ des caractéristiques (36) se situent dans la plage supérieure de charges partielles du moteur à combustion interne au voisinage de λ = 1 et dans la plage inférieure ou plage de charges partielles inférieures dans la zone d'appauvrissement λ > 1.
EP84115723A 1984-02-01 1984-12-18 Système de dosage du mélange air-carburant pour un moteur à combustion Expired EP0151768B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84115723T ATE38412T1 (de) 1984-02-01 1984-12-18 Kraftstoff-luft-gemischzumesssystem fuer eine brennkraftmaschine.

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DE3403395 1984-02-01
DE3403395A DE3403395C2 (de) 1984-02-01 1984-02-01 Einrichtung zur Kraftstoff-Luft-Gemischzumessung für eine Brennkraftmaschine

Publications (3)

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EP0151768A2 EP0151768A2 (fr) 1985-08-21
EP0151768A3 EP0151768A3 (en) 1987-06-16
EP0151768B1 true EP0151768B1 (fr) 1988-11-02

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US (1) US4674459A (fr)
EP (1) EP0151768B1 (fr)
JP (1) JPS60182333A (fr)
AT (1) ATE38412T1 (fr)
AU (1) AU563427B2 (fr)
DE (2) DE3403395C2 (fr)

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Also Published As

Publication number Publication date
ATE38412T1 (de) 1988-11-15
US4674459A (en) 1987-06-23
EP0151768A3 (en) 1987-06-16
DE3474980D1 (en) 1988-12-08
AU563427B2 (en) 1987-07-09
DE3403395A1 (de) 1985-08-08
EP0151768A2 (fr) 1985-08-21
AU3778485A (en) 1985-08-08
JPS60182333A (ja) 1985-09-17
DE3403395C2 (de) 1987-04-23

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