EP1794433B8 - Verfahren und vorrichtung zum steuern einer brennkraftmaschine - Google Patents
Verfahren und vorrichtung zum steuern einer brennkraftmaschineInfo
- Publication number
- EP1794433B8 EP1794433B8 EP05777800A EP05777800A EP1794433B8 EP 1794433 B8 EP1794433 B8 EP 1794433B8 EP 05777800 A EP05777800 A EP 05777800A EP 05777800 A EP05777800 A EP 05777800A EP 1794433 B8 EP1794433 B8 EP 1794433B8
- Authority
- EP
- European Patent Office
- Prior art keywords
- fuel
- pressure pump
- low
- pressure
- value
- 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.)
- Active
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
- F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
-
- 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
-
- 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
-
- 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
- F02D41/3082—Control of electrical fuel pumps
-
- 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
- F02D41/3836—Controlling the fuel pressure
- F02D41/3845—Controlling the fuel pressure by controlling the flow into the common rail, e.g. the amount of fuel pumped
- F02D41/3854—Controlling the fuel pressure by controlling the flow into the common rail, e.g. the amount of fuel pumped with elements in the low pressure part, e.g. low pressure pump
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
- F02D2041/141—Introducing closed-loop corrections characterised by the control or regulation method using a feed-forward control element
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2250/00—Engine control related to specific problems or objectives
- F02D2250/31—Control of the fuel pressure
-
- 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
- F02D41/3836—Controlling the fuel pressure
- F02D41/3845—Controlling the fuel pressure by controlling the flow into the common rail, e.g. the amount of fuel pumped
-
- 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
- F02D41/3836—Controlling the fuel pressure
- F02D41/3863—Controlling the fuel pressure by controlling the flow out of the common rail, e.g. using pressure relief valves
Definitions
- the invention relates to a method and an associated front ⁇ direction for controlling an internal combustion engine with a fuel supply.
- the fuel supply device comprises a low pressure circuit with a low pressure pump and a high pressure pump, which is coupled on the input side with the low pressure circuit and the fuel in a KraftstoffSpei cher ⁇ promotes.
- Such a fuel supply device is known from DE 101 62 989 C1. Furthermore, a circuit arrangement for Re ⁇ rules a controllable fuel pump for an injection system of an internal combustion engine disclosed in which a controller is seen pre ⁇ which compares a target value of fuel pressure with egg ⁇ nem actual value of the fuel pressure and depending on the difference value, a control value for the conveying capacity the fuel pump determined. It is a further Vor Kunststoffein ⁇ standardized and an adder provided. The adding it ⁇ averages a control signal from the control value and a Vorsteu ⁇ Erwert for controlling the delivery rate of the fuel pump. The pilot control unit determines the pilot control value as a function of a desired delivery volume.
- the invention has for its object to provide a method and associated apparatus, and which can make a to-ver understandes controlling an internal combustion engine simply provides ⁇ .
- the object is solved by the features of the independent claims.
- Advantageous developments of the invention are characterized in the subclaims.
- the invention is characterized by a method and an associated device for controlling an internal combustion engine with a fuel supply device.
- the fuel supply device comprises a low-pressure circuit with a low-pressure pump and a high-pressure pump, which is coupled on the input side with the low-pressure circuit and conveys fuel into a fuel reservoir.
- a fuel delivery flow of the low-pressure pump is corrected as a function of a current and a previous predetermined desired value of the fuel pressure in the fuel storage.
- This has the advantage may be that the fuel delivery flow of the Nie ⁇ derdruckpumpe controlled so that a fuel ⁇ is quantitatively considered, which passed through an increase of the pre ⁇ target value of the fuel pressure by the high pressure pump further from the low pressure circuit in the fuel ⁇ memory is promoted or by a reduction of the predetermined target value of the fuel pressure from the high ⁇ pressure pump is less promoted from the low pressure circuit in the fuel ⁇ material storage or is discharged from the Kraftstoffspei- rather in the low pressure circuit. A uner wished ⁇ increase or decrease in the fuel pressure in the low pressure circuit can be avoided.
- the Cor ⁇ rection can be carried out to delay the fuel delivery flow of the low-pressure pump near ⁇ .
- the components in the low-pressure circuit for example the low-pressure pump or an Pressure relief valve, can be easily relieved and protected from damage. As a result, the fuel supply device can be particularly reliable.
- the current and the previous predetermined target value of the fuel pressure in the fuel accumulator are vorzugswei ⁇ se function of operating variables, or the operating mode of the internal combustion engine is determined, for example depending on egg ⁇ ner speed or a fuel mass to or dependent on a homogeneous or stratified operation.
- the foregoing predetermined target value of the fuel pressure is a time determined before the current predefined setpoint value of the fuel pressure setpoint value of the fuel pressure, for example, vorangegange in the last ⁇ NEN stationary phase of the target value of the fuel pressure he ⁇ was averages.
- the fuel pressure in the fuel reservoir is preferably regulated by a control device as a function of the current setpoint value of the fuel pressure.
- the correction of the fuel delivery flow of the low pressure pump is activated depending on the current and the previous predetermined setpoint of the fuel pressure in the fuel ⁇ memory.
- This has the advantage that the fuel delivery flow of the low-pressure pump is only corrected if necessary.
- the correction of the fuel delivery flow of the low-pressure pump is started when the predetermined target value of the fuel pressure is changed by a large amount, that is, for example, the amount of the difference between the current and the previous predetermined Setpoint of the fuel pressure in about 100 bar or the ratio between the current and the previous predetermined setpoint of the fuel pressure is about 50 percent.
- a first correction value is determined when the correction of the fuel delivery flow of the low-pressure pump is activated.
- the first correction value is determined as a function of a current and a preceding variable which is representative of a fuel delivery flow of the high-pressure pump which is set as a function of the current preset nominal value of the fuel pressure in the fuel reservoir .
- the fuel delivery flow of the low pressure pump is corrected depending on the first correction value.
- the knowledge is used that the fuel delivery ⁇ flow of the high-pressure pump is controlled or regulated depending on the respective current setpoint value of the fuel pressure in the fuel storage and the current and the previous size then ent ⁇ holds information about how the fuel flow the high-pressure pump changes after a change in the predetermined setpoint of the fuel pressure. This information can be used very easily in order to adapt the fuel delivery flow of the low-pressure pump accordingly.
- the variable that is representative of a fuel delivery flow of the high-pressure pump is, for example, a control signal for setting the fuel delivery flow of the high-pressure pump, but it may also be a measured value of a measured variable detected by a sensor or an estimated variable.
- the first correction value is assigned a neutral value after From ⁇ running a predetermined period of time immediately an ⁇ joins the last activation of correcting the fuel delivery flow of the low pressure pump.
- a current second correction value is determined, which is equal to the first correction value, while the correction of the fuel delivery flow of the low-pressure pump is activated.
- the current second correction value is further determined from ⁇ dependent on a difference from a previous second correction value and a reset value when the correction of the fuel delivery flow of the low pressure pump is not activated, until the current second correction value a neutral
- the fuel delivery flow of the low pressure pump is corrected depending on the second correction value. This has the advantage that a possibly provided control or regulation is relieved of the fuel pressure in the low pressure circuit by avoiding sudden large ⁇ nde ⁇ conclusions of the fuel delivery flow of the low-pressure pump, after ⁇ which has been disabled, the correction of the fuel delivery flow of the low pressure ⁇ pump.
- a third correction value is determined when the correction of the fuel delivery flow of the low-pressure pump is activated.
- the third correction value is determined depending on the current and the previous predetermined setpoint of the fuel pressure in the fuel storage.
- the fuel delivery flow of the low-pressure pump is corrected as a function of the third correction value. Correcting the fuel flow of the low pressure pump is so easy. Such a correction can be made even if no member Stell ⁇ pump for altering the fuel delivery flow of the high pressure ⁇ at steady speed is present.
- Correction value is determined from a map. This has the advantage that the determination of the third correction value is very simple and that the required computing effort is low.
- FIG. 2 shows the block diagram of a control device for regulating the fuel pressure in a fuel feed
- FIG. 5 shows a flowchart for a second embodiment of the program for determining the fuel delivery flow of the low-pressure pump. Elements of the same construction or function are provided with the same reference numbers across the figures.
- An internal combustion engine (FIG. 1) comprises an intake tract 1, an engine block 2, a cylinder head 3 and an exhaust tract 4.
- the engine block 2 comprises a plurality of cylinders which have pistons and connecting rods via which they are coupled to a crankshaft 21.
- the cylinder head 3 includes a valve gear with a gas ⁇ inlet valve, a gas outlet and valve actuators.
- the cylinder head 3 further includes an injection valve 34 and a spark plug.
- a fuel supply device 5 comprises a fuel tank 50, which is connected to a low-pressure pump 51 via a first fuel line.
- the low pressure pump 51 is operatively connected to an inlet 53 of a high pressure pump 54.
- a pressure relief valve 52 is provided, which is connected on the output side via a further force ⁇ fuel line to the fuel tank 50.
- the low-pressure pump 51, the pressure relief valve 52, the first fuel line, the further fuel line and the inlet 53 form a low-pressure circuit.
- the low-pressure pump 51 is preferably designed so that it always supplies a sufficiently high fuel quantity during operation of the internal combustion engine, which ensures that a predetermined low pressure is not exceeded.
- the inlet 53 is guided to the high-pressure pump 54, wel ⁇ che the output side, the fuel toward a fuel Memory 55 promotes.
- the high-pressure pump 54 is generally driven by the camshaft and thus conveys at kon ⁇ constant speed of the crankshaft 21 a constant fuel volume in the fuel storage 55th
- the injection valves 34 are operatively connected to the fuel reservoir 55.
- the fuel is thus the Einspritzventi ⁇ len 34 supplied via the fuel storage 55th
- a volume flow control valve 56 is provided, by means of which the volume flow can was ⁇ set that is the high-pressure pump 54 is supplied.
- a desired value FUP_SP the fuel pressure in the fuel storage ⁇ 55 can be adjusted.
- the volume flow control valve 56 is an actuator that controls a fuel flow of the high-pressure pump 54.
- the volume flow control valve 56 controls the fuel delivery flow of the high-pressure pump 54 as a function of an actuating signal PWM_HP of the high-pressure pump 54, which is, for example, a pulse-width-modulated electrical current and the fuel delivery flow of the high-pressure pump 54 is dependent on its pulse width.
- the control signal PWM_HP of the high-pressure pump 54 is thus a variable that is representative of the fuel delivery flow of the high-pressure pump 54.
- a high-pressure pump 54 may be provided, the fuel flow is dependent on a drive angle.
- the drive angle corresponds to a crankshaft angle at which the high-pressure pump 54 starts at each crankshaft revolution, fuel in the fuel Memory 55 to promote.
- the delivery of the fuel ends in each case when the crankshaft angle reaches a predetermined crankshaft angle.
- the Anbericht ⁇ angle is a size that is representative of the fuel flow of the high-pressure pump 54 and the control signal PWM_HP the high-pressure pump 54, for example, the drive angle.
- the variable which is representative of the fuel delivery flow of the high-pressure pump 54 can also be an estimated variable which is determined as a function of ascertained, detected or predetermined operating variables of the internal combustion engine.
- a sensor may be provided, the measured variable of which is the fuel delivery flow of the high-pressure pump 54.
- the measured value the ⁇ ser measured variable is then representative of the Kraftstoffför- derstrom the high pressure pump 54th
- the fuel supply device 5 can alternatively or additionally be provided with an electromechanical pressure regulator 57, which is arranged on the output side of the fuel reservoir 55 and is provided with a return line into the low pressure circuit.
- an electromechanical pressure regulator 57 By a corresponding control of the electromechanical pressure regulator 57, a target value FUP_SP a ⁇ can be provided in the fuel pressure in the fuel accumulator 55th If the fuel pressure in the fuel accumulator 55 is greater than the preset by corresponding control of the electromechanical pressure regulator 57 force ⁇ fuel pressure, the electromechanical pressure regulator 57 opens, and fuel is discharged from the fuel accumulator 55 in the low pressure circuit.
- the volume flow control valve 56 may also be integrated pump 54 in the high-pressure ⁇ .
- the electromechanical pressure regulation and the volume flow control valve 56 may be assigned a common ⁇ samer actuator.
- a fuel delivery flow of the low-pressure pump 51 is dependent on a control signal PWM_LP of the low-pressure pump 51, which, like the control signal PWM_HP of the high-pressure pump 54, can be a pulse-width-modulated flow and the fuel flow of the low-pressure pump 51 is dependent on its pulse width.
- the internal combustion engine is assigned a control device 6, which in turn are associated with sensors that detect ver ⁇ different parameters and each determine the measured value of the measured variable.
- the control device 6 determines dependent on at least one of the measured variables manipulated variables, which are then converted into corresponding control signals for controlling actuators by means of corresponding actuators.
- the sensors are, for example, a pedal position sensor which detects the position of an accelerator pedal, a crankshaft angle sensor which detects the crankshaft angle and which is then assigned a rotational speed, an air mass meter, a first fuel pressure sensor 58 which has an actual value FUP_AV of the fuel pressure in the fuel accumulator 55 detects, and a second fuel pressure sensor 59, the ei ⁇ NEN actual value of the fuel pressure in the low pressure circuit he ⁇ sums.
- a pedal position sensor which detects the position of an accelerator pedal
- a crankshaft angle sensor which detects the crankshaft angle and which is then assigned a rotational speed
- an air mass meter e.g., a first fuel pressure sensor 58 which has an actual value FUP_AV of the fuel pressure in the fuel accumulator 55 detects
- a second fuel pressure sensor 59 the ei ⁇ NEN actual value of the fuel pressure in the low pressure circuit he ⁇ sums.
- the actuators are, for example, as gas inlet or gas outlet valves, injectors 34, spark plug, throttle flap, low-pressure pump 51, flow control valve 56 or as electromechanical pressure regulator 57 is formed.
- the internal combustion engine also has other cylinders, which are then assigned corresponding actuators.
- FIG. 2 shows a block diagram of a control device which can be used to regulate the fuel pressure in the fuel accumulator 55 in a first operating mode of the fuel supply device 5.
- the fuel pressure in the fuel accumulator 55 is set as a function of the amount of fuel that is conveyed from the low-pressure circuit into the fuel accumulator 55 by the high-pressure pump 54.
- the amount of fuel may be a fuel mass or a fuel volume.
- the delivered fuel quantity is dependent on the fuel delivery flow of the high-pressure pump 54, which is set by the control signal PWM_HP of the high-pressure pump 54.
- the fuel pressure in the Kraft ⁇ hydrogen storage 55 If more fuel is pumped into the fuel storage 55 as a ⁇ is injected into the combustion chambers of the internal combustion engine, the fuel pressure in the Kraft ⁇ hydrogen storage 55. If less fuel in the Kraftstoff ⁇ memory is promoted 55 is than injected into the combustion chambers of the internal combustion engine , then the fuel pressure in the fuel reservoir 55 decreases accordingly.
- the volume flow control valve 56 is preferably closed. By the volume flow control valve 56 flows if ⁇ only one leakage flow.
- the second operating mode can also be used if no volume flow control valve 56 is provided in the fuel supply device and the high-pressure pump 54 promotes a Annae ⁇ hernd same amount of fuel from the low pressure circuit in the fuel reservoir 55 with each revolution of the crankshaft 21st If the electromechanical pressure regulator 57 is closed and less fuel is injected into the combustion chambers of the internal combustion engine than is conveyed into the fuel accumulator 55, the fuel pressure in the fuel accumulator 55 increases until the electromechanical pressure regulator 57 opens and discharges fuel into the inlet 53. Thus, the fuel pressure in the fuel accumulator 55 to the target value of the fuel is FUP_SP ⁇ pressure limited.
- a control difference FUP_DIF is determined from a difference between the setpoint value FUP_SP of the fuel pressure and the actual value FUP_AV of the fuel pressure.
- the control difference FUP_DIF is fed to a controller in block B1.
- This controller is preferably designed as a PI controller.
- a controller value MFF_FB_CTRL is determined.
- a pre-control value MFF_PRE is determined in a block B2.
- the pre-control value MFF_PRE, the controller value MFF_FB_CTRL and a fuel mass MFF_INJ to be injected are added up to a fuel mass MFF_REQ to be conveyed, preferably the fuel mass to be delivered per cylinder segment.
- the actuating signal PWM_HP of the high-pressure pump 54 is determined as a function of the fuel mass MFF_REQ to be delivered, a segment time duration T_SEG_AV and correction quantities COR.
- the fuel mass MFF_REQ to be conveyed is divided by the segment time duration T_SEG_AV and multiplied by a correction factor which comprises the correction quantities COR, in particular the fuel density in the force StoffSpeicher 55, is determined.
- the segment time T_SEG_AV is equal to the period of time required for one rotation of the crankshaft 21, divided by half to ⁇ number of cylinders of the internal combustion engine, there is injected only at every second rotation of the crankshaft 21 in the same cylinder.
- the correction quantities COR include play, the fuel density in the fuel reservoir 55 and / or a fuel temperature at ⁇ .
- a block B4 represents the force ⁇ shown in Figure 1 material-supplying means 5.
- the control signal PWM_HP Hoch ⁇ the pressure pump 54 is the input variable of the block B4.
- the off ⁇ output variable of the block B4 is the actual value of the motor FUP_AV ⁇ fuel pressure which is detected for example by means of the fuel pressure sensor 58th
- a corresponding control device can also be provided for the second operating mode of the fuel supply device 5, in which a control signal for the electromechanical pressure regulator 57 is generated for regulating the fuel pressure in the fuel accumulator 55.
- the fuel pressure in the fuel accumulator 55 can be reduced to a predetermined fuel pressure by reducing the fuel delivery flow of the high-pressure pump 54 as compared to the fuel delivery flow that prevails immediately before the pressure reduction begins, until enough fuel from the fuel accumulator is injected by injection operations 55 is witheu ⁇ in the combustion chambers of the internal combustion engine.
- the low-pressure circuit is possibly taken from less fuel than is conveyed by the low-pressure pump 51 into the inlet 53.
- power may ⁇ material via the electro-mechanical pressure regulator 57 from the fuel storage 55 are deactivated in the circular Niederbuch ⁇ into the inlet 53rd In this case, fuel is added in addition to that supplied by the low-pressure pump 51
- Fuel introduced into the low pressure circuit may increase beyond the intended fuel pressure. This additionally stresses the components of the low-pressure circuit and can reduce their reliability and durability.
- FIGS. 3 and 4 show a flowchart for a first embodiment of a program for determining the fuel ⁇ delivery flow of the low-pressure pump 51.
- the program is stored in the control device 6 and is executed during operation of the internal combustion engine.
- the program begins with a step S1 (FIG. 3) in which necessary preparations are made, in particular when the program is first executed. For example, logical variables are assigned a preset value or counters are reset.
- a step S2 the control signal PWM_HP the high ⁇ pressure pump 54 and the setpoint FUP_SP of the fuel pressure to a current time t_n determined.
- the control signal PWM_HP of the high-pressure pump 54 is determined, for example, as shown in FIG.
- a step S3 it is checked whether a logical variable LV_LP_COR is assigned a predetermined truth value, eg one.
- LV_LP_COR represents the activation state of the correction of the fuel delivery flow of the low-pressure pump 51.
- a target ⁇ is worth difference FUP_SP_DIF the fuel pressure from the target ⁇ value FUP_SP the fuel pressure at the current instant t_n and Setpoint value FUP_SP of the fuel pressure is determined at a previous time t_n-1.
- the setpoint difference FUP_SP_DIF is the fuel pressure nega tive ⁇ .
- FUP_SP_DIF of fuel pressure checked. If the setpoint ⁇ difference FUP_SP_DIF of the fuel pressure is less than or equal to a threshold FUP_SP_DIF_THR the setpoint difference FUP_SP_DIF of KraftStoff grouts, then the correction of the fuel flow of the low-pressure ⁇ pump is activated in a step S6 by the logical variable LV_LP_COR is assigned to the associated truth value, eg with One.
- the threshold value FUP_SP_DIF_THR of the setpoint difference FUP_SP_DIF of the fuel pressure is preferably negative.
- the control signal is the high PWM_HP ⁇ pressure pump 54 at the previous instant t_n-l as a reference value of the control signal PWM_HP_REF PWM_HP the high pressure pump 54 stored.
- a tough ⁇ ler CTR is reset, for example, to zero.
- a first correction value PWM_LP_COR1 is determined from the reference value PWM_HP_REF of the control signal PWM_HP of the high-pressure pump 54 and the control signal PWM_HP of the high-pressure pump 54 at the current time t_n.
- the value of the first correction value PWM_LP_COR1 is assigned to a second correction value PWM_LP_COR2 at the current time t_n.
- the counter CTR is in one
- the counter CTR is checked. If the counter CTR is smaller than a predefined threshold value CTR_THR of the counter CTR, then the program flow is continued in a step S13.
- the control signal is the low PWM_LP ⁇ pressure pump 51 as a difference from a control signal request PWM_LP_REQ for the low-pressure pump 51 and the second corrosion rekturwert PWM_LP_COR2 at the current instant t_n ermit ⁇ telt.
- the control signal request PWM_LP_REQ for the low-pressure pump 51 is determined, for example, as a function of a desired value of the fuel pressure in the low-pressure circuit, a fuel temperature and a desired value of the fuel delivery flow of the low-pressure pump 51, as disclosed in DE 101 62 989 C1, which are hereby incorporated by reference is involved.
- the control signal PWM_HP of the high-pressure pump 54 is stored at the current time t_n as a control signal PWM_HP of the high-pressure pump 54 at the preceding time t_n-1. Accordingly, the target value FUP_SP of the fuel pressure becomes the target value at the current time t_n FUP_SP of the fuel pressure at the previous time t_n-l stored and the second correction value PWM_LP_COR2 at the current time t_n is stored as a second correction value PWM_LP_COR2 at the previous time t_n-l.
- a step S15 the program flow is completed and continued after a waiting time T_W (FIG. 3) in the step S1.
- the waiting time T_W can for example be equal to the segment time T_SEG_AV and specifies the Zeit ⁇ interval in which the program is executed.
- the time ⁇ interval t_n between the current time and the previous time t_n-l, is preferably equal to the waiting time T_W.
- the preceding time t_n-l may also be associated with a time at which an operating variable of the internal combustion engine was last statio ⁇ nary.
- the target value FUP_SP the fuel pressure at the previous instant t_n-l preferably equal to the final steady-state desired value
- FUP_SP is the fuel pressure in the fuel reservoir 55 and the target value FUP_SP t_n of the motor ⁇ fuel pressure at the current time, the new sta ⁇ tionary target value to which the fuel pressure in the fuel storage 55 is to be adjusted or regulated.
- step S3 If the condition is satisfied in the step S3, the corrective ⁇ ie structure of the fuel delivery flow of the low-pressure pump 51 is activated, the program run is continued in the step S9.
- the activation state of the correction of the fuel delivery stream of the low-pressure pump 51 is reset by see variable LV_LP_COR is occupied in a step Sl6 with the zugehö ⁇ rigen truth value, for example, zero.
- the ⁇ running program is then continued in the step S13.
- step S5 If the condition in step S5 is not met, ie the setpoint difference FUP_SP_DIF of the fuel pressure is greater than the threshold value FUP_SP_DIF_THR of the setpoint difference FUP_SP_DIF of the fuel pressure, then the program flow is continued in a step S17.
- the first correction value PWM_LP_CORl is backed up with a neutral value ⁇ be, for example, zero.
- a step S18 it is checked whether the amount of the two ⁇ th correction value PWM_LP_COR2 t_n at the current instant is greater than the magnitude of a reset value LIM. If this condition is fulfilled, a difference from the second correction value PWM_LP_COR2 to the previous time t_n-1 and the reset value LIM is assigned to the second correction value PWM_LP_COR2 at the current time t_n in a step S19. The program flow is then continued in step S13. If the condition is not satisfied in the step S18, in a step S20 the second Cor ⁇ eg zero rekturwert PWM_LP_COR2 at the current instant t_n a neutral value assigned. The program flow is then continued in step S13.
- the correction of the fuel delivery flow of the low pressure pump 51 may also be activated when the fuel pressure set point FUP_SP is increased.
- the setpoint difference FUP_SP_DIF of the fuel pressure determined in step S4 is positive.
- the step S5 is then replaced by a step S21, in which it is checked whether the setpoint ⁇ difference FUP_SP_DIF the fuel pressure greater than or equal when the threshold value FUP_SP_DIF_THR is the target value difference FUP_SP_DIF of the fuel pressure.
- the threshold FUP_SP_DIF_THR is preferably positive. If the condition is satisfied in the step S21, then the program flow is continued in the step S6, otherwise the program flow is continued in the step S17.
- the threshold CTR_THR of the counter CTR is preferably selected so that the correction of the fuel delivery flow of the low pressure pump 51 voltage only for a time period in the size North ⁇ of a few hundred milliseconds fourth akti ⁇ example, for example, for three hundred milliseconds, the logi ⁇ ie specific variable LV_LP_COR is already reset after a few hundred milliseconds in the step S16 after being set in the step S6.
- the counter CTR counts during this time period, the number of program sequences, until the loading ⁇ dingung satisfied in the step S12.
- the reset value LIM is selected such that the magnitude of the second correction value
- PWM_LP_COR2 at the current time t_n with each Zeit ⁇ step so for example, respectively after the expiration of the waiting time ⁇ T_W, in the direction of a neutral value, for example zero, reduced.
- the neutral value is preferably achieved after a few hundred milliseconds, for example after dreihun ⁇ changed milliseconds.
- FIG. 5 shows a flow diagram for a second Ausu ⁇ approximate shape of the program for determining the Kraftstoff maybe- flow of the low pressure pump 51.
- the steps Sl, S3 to S6, S8, Sil, S12, S15, S16 and S21 are in accordance with the first exporting ⁇ approximate shape of the Program executed.
- the step S2 is he ⁇ sets by a step S22, in which the setpoint FUP_SP of Fuel pressure is determined at the current time t_n.
- the program sequence is continued in step S3.
- the step S7 is replaced by a step S23 in which the target value difference FUP_SP_DIF of the fuel pressure is stored as a reference value FUP_SP_DIF_REF of the target value difference FUP_SP_DIF of the fuel pressure.
- the program sequence is then continued in step S8.
- step S24 the correction of the fuel delivery flow of the low-pressure pump 51 is activated, in a step S24 replacing the step S9, a third correction value PWM_LP_COR3 depending on the stored reference value FUP_SP_DIF_REF Setpoint difference FUP_SP_DIF of the fuel pressure and determined by the counter CTR.
- This can be done at ⁇ play by means of a map stored in the geeigne ⁇ te values, which are preferably in advance by experiments on an engine test bed, by simulations or by Fahr ⁇ experiments were determined. Alternatively, it is also possible, for example, to use functions based on physical models.
- the program flow is continued after step S24 in step S11.
- step S5 If the condition in step S5 is not met, that is, if the setpoint difference FUP_SP_DIF of the fuel pressure is greater than the threshold value FUP_SP_DIF_THR of the setpoint ⁇ difference FUP_SP_DIF of the fuel pressure, then in a step S25, which replaces the steps S17 to S20, the third correction value PWM_LP_COR3 is assigned a neutral value, eg zero. The program flow is then continued in a step S26. Likewise, the program flow after step Sl6 is continued in step S26.
- the control signal ⁇ PWM_LP is the low-pressure pump 51 is determined as the difference of the corrective signal request PWM_LP_REQ for the low-pressure pump 51 and the third correction value PWM_LP_COR3.
- the setpoint FUP_SP then the fuel ⁇ pressure at the current time t_n as setpoint FUP_SP the fuel pressure at the previous instant t_n-l ge ⁇ stores and the program flow at step S15 completed and after the waiting period T_W in step Sl, in a step S27 continues.
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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)
- Fuel-Injection Apparatus (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004045738A DE102004045738B4 (de) | 2004-09-21 | 2004-09-21 | Verfahren und Vorrichtung zum Steuern einer Brennkraftmaschine |
PCT/EP2005/053901 WO2006032577A1 (de) | 2004-09-21 | 2005-08-08 | Verfahren und vorrichtung zum steuern einer brennkraftmaschine |
Publications (3)
Publication Number | Publication Date |
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EP1794433A1 EP1794433A1 (de) | 2007-06-13 |
EP1794433B1 EP1794433B1 (de) | 2008-01-30 |
EP1794433B8 true EP1794433B8 (de) | 2008-05-07 |
Family
ID=35045028
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EP05777800A Active EP1794433B8 (de) | 2004-09-21 | 2005-08-08 | Verfahren und vorrichtung zum steuern einer brennkraftmaschine |
Country Status (6)
Country | Link |
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US (1) | US7503313B2 (de) |
EP (1) | EP1794433B8 (de) |
JP (1) | JP2008513679A (de) |
KR (1) | KR101154128B1 (de) |
DE (2) | DE102004045738B4 (de) |
WO (1) | WO2006032577A1 (de) |
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-
2004
- 2004-09-21 DE DE102004045738A patent/DE102004045738B4/de not_active Expired - Fee Related
-
2005
- 2005-08-08 EP EP05777800A patent/EP1794433B8/de active Active
- 2005-08-08 KR KR1020067027465A patent/KR101154128B1/ko active IP Right Grant
- 2005-08-08 US US11/662,929 patent/US7503313B2/en not_active Expired - Fee Related
- 2005-08-08 WO PCT/EP2005/053901 patent/WO2006032577A1/de active IP Right Grant
- 2005-08-08 DE DE502005002735T patent/DE502005002735D1/de active Active
- 2005-08-08 JP JP2007532869A patent/JP2008513679A/ja not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
US7503313B2 (en) | 2009-03-17 |
DE502005002735D1 (de) | 2008-03-20 |
EP1794433B1 (de) | 2008-01-30 |
WO2006032577A1 (de) | 2006-03-30 |
KR101154128B1 (ko) | 2012-06-11 |
DE102004045738B4 (de) | 2013-05-29 |
EP1794433A1 (de) | 2007-06-13 |
KR20070057090A (ko) | 2007-06-04 |
US20070295310A1 (en) | 2007-12-27 |
DE102004045738A1 (de) | 2006-04-06 |
JP2008513679A (ja) | 2008-05-01 |
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