EP2102476A1 - Systeme d'alimentation en carburant pour moteur a combustion interne et procede de commande correspondant - Google Patents
Systeme d'alimentation en carburant pour moteur a combustion interne et procede de commande correspondantInfo
- Publication number
- EP2102476A1 EP2102476A1 EP07847762A EP07847762A EP2102476A1 EP 2102476 A1 EP2102476 A1 EP 2102476A1 EP 07847762 A EP07847762 A EP 07847762A EP 07847762 A EP07847762 A EP 07847762A EP 2102476 A1 EP2102476 A1 EP 2102476A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- actuator
- pump
- frequency
- 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.)
- Granted
Links
Classifications
-
- 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
- F02D41/20—Output circuits, e.g. for controlling currents in command coils
- F02D2041/202—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
- F02D2041/2024—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit the control switching a load after time-on and time-off pulses
- F02D2041/2027—Control of the current by pulse width modulation or duty cycle control
-
- 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
- F02D2200/0602—Fuel pressure
-
- 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
- F02D41/20—Output circuits, e.g. for controlling currents in command coils
Definitions
- Fuel supply system for an internal combustion engine and corresponding control method Fuel supply system for an internal combustion engine and corresponding control method.
- the invention relates to the field of gasoline or diesel engines, with n cylinders, equipped with an injection system (also called fuel supply system), and in particular the injection systems involving at least one actuator. (or regulator) the flow and / or the pressure of the fuel. More specifically, the invention relates to gasoline or high pressure diesel direct injection systems, commonly known as “Common Rail” (“Common Rail”) systems.
- the actuator is controlled to adjust the fuel flow through the pump (as part of a flow actuator) so that the measured pressure reaches the desired pressure.
- a control signal may be a control current proportional to the electromotive force allowing the displacement of the actuator.
- reaction time of the actuator relative to the control can be particularly long because, for example, microblocking of internal parts due to the misalignment of the internal parts of the actuator, or to the wear of the guide of these pieces.
- No. 4,020,654 discloses a process for improving the properties, in particular dynamic properties, of this regulation of the flow (or pressure) of the fuel by modifying the control signal of the actuator.
- this method requires, on the one hand, modifying the calculation unit of the control signal and, on the other hand, adding a device measuring the arrangement of the actuator member to be adjusted, which is particularly expensive and cumbersome.
- the invention aims to provide a solution to this problem.
- An object of the invention is therefore to propose a fuel supply system, in which the integrated actuator (s) within the pump are particularly responsive to the control signal for regulating the flow (or pressure) of the fuel.
- a first aspect of the invention relates to a fuel supply system for an internal combustion engine, comprising a pump system arranged between an injection ramp and a fuel tank, with at least one actuator whose opening is controlled by a pulse modulation type signal, so as to make successive adjustments of the opening of said actuator by means of a control variable according to a cycle ratio setpoint.
- This cycle report setpoint reflects the duration during which the control signal of the opening of the actuator is applied.
- the power system also includes an electronic control unit.
- said electronic control unit further comprises auxiliary means capable of increasing the amplitude of the oscillations of said control variable around an average value, if the value of said Cycle report setpoint is included in a given critical area.
- auxiliary means capable of increasing the amplitude of the oscillations of said control variable around an average value, if the value of said Cycle report setpoint is included in a given critical area.
- reaction time was particularly long when the control variable was weakly oscillating. This case corresponds to particularly high or particularly low opening duty cycle values.
- the invention thus makes it possible to prevent this situation from occurring, by causing under certain conditions the increase of the amplitude of the oscillations of the control signal of the actuator, and consequently the increase of the oscillation of the electromotive force. corresponding.
- said auxiliary means are capable of increasing the amplitude of the oscillations of said control quantity by decreasing the frequency of the control signal.
- the system may further comprise first storage means capable of storing the value of a lower limit of the frequency of the control signal, determined according to the characteristics of the fuel supply system of the engine.
- the system may also comprise second storage means capable of storing the value of an upper limit of the frequency of the control signal, lower than the natural frequency of said actuator.
- said pump system comprises an auxiliary pump called "low pressure" coupled between the actuator and said fuel tank.
- Said auxiliary means may then be able to adjust the frequency of the control signal of the actuator so that it is out of the vicinity of an integer value of the discharge frequency of said low pressure auxiliary pump.
- said auxiliary means can also be adapted to adjust the frequency of the control signal of the actuator so that it out of the vicinity of an integer value of the suction frequency of said high pressure auxiliary pump.
- said auxiliary means may also be able to adjust the frequency of the control signal of the actuator so that it is different from the natural frequency of the actuator relative to its environment (mechanical, hydraulic).
- the pump is coupled to said fuel tank via a return loop comprising a mechanical pressure limiter. Said auxiliary means may then be able to adjust the frequency of the control signal of the actuator so that it is different from the natural frequency of said mechanical pressure limiter relative to its environment (mechanical, hydraulic).
- the system may also comprise at least one fuel temperature sensor, said auxiliary means then being able to oscillate said quantity also if the value of the fuel temperature is lower than a predetermined critical value.
- At least one of the actuators of the pump is a flow and / or pressure actuator.
- a method of controlling a fuel supply system for an internal combustion engine comprising a pump system disposed between an injection ramp and a fuel tank, said method comprising controlling the opening of at least one actuator of the pump system, by means of a pulse - type type of control variable, so as to make successive adjustments of the opening of said actuator by function of a cycle report setpoint.
- FIG. schematically an internal combustion diesel engine
- FIG. 2 schematically illustrates the piston of the actuator of the fuel supply system associated with the engine represented in FIG. 1;
- FIG. 3 illustrates the evolution of the control current of the piston according to the opening duty cycle;
- FIG. 4a illustrates an example of a simplified characteristic curve of a flow actuator for a given pump speed
- FIG. 4b illustrates an example of a simplified inverse characteristic curve of a flow actuator for a given pump speed
- FIG. 5 illustrates the elaboration of the control of the piston of the actuator according to the invention
- FIG. 6 illustrates more precisely the pump system inserted into the fuel supply system of the engine.
- FIG. 7 illustrates in greater detail the high pressure elements of the pump shown in FIG. 6;
- FIG 8 illustrates an embodiment of the method according to the invention.
- FIGS. 9 and 10 illustrate the variations of the control current of the actuator according to the prior art.
- FIG. 1 is very schematically represented an internal combustion diesel engine referenced la, fed with fuel via a Ib supply system (of course, the invention can also be applied to the gasoline engine).
- the engine includes four cylinders.
- the fuel supply system Ib of this engine comprises four injectors referenced 2, each connected by a high pressure hose 3 to the battery 4 called "the rail”.
- the fuel supply system Ib also comprises a pump 5, which draws fuel from the tank 6 of the vehicle via a low pressure circuit 7.
- the function of the pump 5 is to compress the fuel taken from the tank 6 of the vehicle and push it back into the rail 4.
- the pump 5 is composed of a low pressure part (transfer pump) and a high pressure part (high pressure pump). Note that the pump 5 is also connected to the tank 6 via a return circuit 8. This return circuit 8 serves to regulate the leakage rate of the high pressure part, as well as the lubrication and cooling rate.
- a flow actuator 9 (or flow valve) is integrated with the low pressure side pump 5. This flow actuator 9 makes it possible to adjust the amount of fuel that will be sent to the rail 4, to which the pump 5 is connected via a connection 10.
- the feed system Ib may also be equipped at the outlet of the pump 5 on the side of the connection 10, or directly on the rail 4, with a pressure actuator also called a discharge actuator. For simplification purposes, this pressure actuator is not shown.
- This computer 11 comprises conventional components, such as microprocessors, EEPROM type hard memories and RAM type buffers.
- This information 12 comes from different sensors placed on the engine and its ancillary systems, such as the injection system, the air supply system, etc. .
- the computer 11 then processes the input data 12 to define or calculate control levels 14 outputted from the computer 11 via a connection 15.
- the control levels 14 are sent to the various actuators that participate in the control of the ancillary systems and therefore of the motor. More particularly, these control levels are transmitted via a connection 16 to the injectors 2, and a connection 17 to the actuator 9.
- the value of the PCONS pressure setpoint is compared with the value of the effectively measured pressure PMES in the rail 4.
- This value PMES is delivered via a connection 18 to the computer 11, in parallel with the information 12.
- PID Proportional Integral Derivative
- actuator control signals are PWM (Pulse Modulated Modulation) type (PWM).
- PWM Pulse Modulated Modulation
- the control signal is characterized by its nominal voltage U P W M and its frequency F P W M -
- the percentage of the duty ratio (RCO) is between 0 and 100%.
- This electromagnetic force Fem is proportional to the percentage of the opening duty ratio RCO, which allows the displacement of an internal piston 20 (or needle) of the flow actuator 9.
- the position of the piston 20 determines the passage section ( and therefore the flow rate) of the fuel entering the pump via inlets 21 and 22.
- the fuel leaves through an opening referenced 23.
- a friction force Ff opposes the electromagnetic force Fem. This friction force Ff results in example of a misalignment of parts or wear of the guidance of parts.
- the percentage of the opening duty ratio RCO applied to the modulating control signal of the actuator makes it possible to establish a more or less large average current I P W M.
- the upper part of Figure 3 corresponds to an opening duty cycle of 30% and the lower part to an opening duty cycle of 90%.
- I P W M corresponds the average electromagnetic force Fem, which makes it possible to control the displacement and the position of the piston of the actuator, thus fixing the desired passage section for the flow of the fuel (more or less important flow ).
- a simplified characteristic curve of a flow actuator is shown in FIG. 4a. This characteristic corresponds to a given pump speed, knowing that the pump is rotated by the motor with a drive ratio R. Thus, the higher the flow demand (in liters / minute), the higher the duty cycle. RCO opening (for a fixed PWM amplitude modulation frequency) to be applied will be important.
- the average current I P W M corresponding to the UW M voltage for a given RCO oscillates around an average position.
- the invention makes it possible to make the current oscillating, with a sufficient amplitude of oscillation.
- the electromagnetic force Fem generated is then also oscillating.
- the position of the piston of the actuator is no longer maintained at a fixed position, but is set in motion around a mean position.
- FIG. 5 An embodiment of the actuator control method implemented within the control unit 11 is shown in FIG. 5.
- the control unit 11 stores a first mapping 30, called open loop mapping, for determining the positioning of the flow actuator according to a DC fuel flow setpoint and the engine speed. of the vehicle Nm respectively delivered at the input of the map 30 via connections 31 and 32.
- the mapping 30 makes it possible to develop a nominal current setpoint CCN for the control of the flow actuator.
- mapping 33 is able to develop the pressure set point of the rail PCONS as a function of the fuel flow setpoint DC delivered via a connection 34, and the engine speed Nm delivered via a connection 35 as well as the parameters 12 delivered. via the connection 13.
- the instruction PCONS is delivered to a comparator 36 which also receives via the connection 18 the pressure PMES measured at the level of the rail 4.
- the difference .DELTA.P between the two pressure values PCONS and PMES is delivered, via a connection 36a, to a corrector 37 (for example a corrector of the PID type) which generates a corrective current setpoint ICOR.
- a corrector 37 for example a corrector of the PID type
- This instruction ICOR is delivered to an adder 38 via a connection 39.
- This adder 38 also receives on another input via a connection 40 the rated nominal current CCN.
- the output of the adder 38 is connected via a connection 41 to auxiliary means 42 whose role is to determine the frequency F PWM of the control signal of the actuator and the percentage of the duty cycle. RCO, applied to this actuator.
- the auxiliary means 42 also receives the engine speed Nm via a connection 43, the fuel temperature TC via a connection 44, and the value of the fuel flow DC via a connection 45.
- the role of these variables TC and DC are explained in more detail below.
- the auxiliary means 42 derives from all these variables the frequency modulated control signal F P W M , and the duty cycle RCO.
- This control signal is transmitted to the actuator 9 via the connection 15.
- the frequency of the control signal F P W M is modified, in particular for a high or low percentage of RCO, the choice of the frequency must take into account characteristics of the components of the system, to avoid creating instability of the pressure in the rail 4.
- the inventors contrary to what has been described in the document DE 1 033 04665, the inventors have observed that the presence of The oscillations at the pressure of the rail 4 are not explained solely by the impact of the frequency of the flow of the fuel leaving the rail, but also by the impact of the frequency of the flow entering the rail. , on which the actuator 9 directly influences the frequency F P W M of its control signal.
- FIG. 6, illustrates more precisely the pump system 5.
- the latter comprises a booster pump 50 or a low-pressure pump and a high-pressure pump 51.
- the flow actuator 9 is disposed between these two pumps 50 and 51, to which it is respectively connected via connections 52 and 53.
- a pressure actuator (not shown for simplification purposes) could be installed at the outlet of the high pressure pump on the connection 10.
- the pressure between the flow actuator 9 and the high pressure pump 51 is called P2.
- the pressure between the booster pump 50 and the flow actuator 9 is called P1.
- a mechanical pressure limiter referenced 54 is connected between the connection 8 and the node common to the booster pump 50 and the flow actuator 9.
- the limiter 54 is connected to this common node via a connection 55. Note Ql the flow delivered by the booster pump, Q2 the flow rate through the pressure limiter 54, Q3 the flow rate through the flow actuator 9 and Q4 the flow rate admitted by the high pressure pump
- the volume admitted by each element of the pump system 5 is directly determined by the flow rate
- FIG. 7 illustrates in greater detail the high-pressure pump 51.
- the high-pressure pump 51 receives as input the setpoint DPS corresponding to the displacement of the piston of the flow actuator 9. This DPS instruction has a direct impact on the flow Q3 passing through the flow actuator 9 and thus on the effective supply pressure P2.
- An intake valve 60 is connected to a pumping element 61, via a connection 62.
- the output of the pumping element 61 is connected to another intake valve 63 via a connection 64.
- the other intake valve 63 is connected to the rail 4 via the connection 10.
- the flow rate, and thus the volume admitted to each shot Q4 has a low frequency variation.
- the value of this low harmonic frequency is directly related to the ratio between the two frequencies: we find this low frequency variation in the value of the pressure of the rail 4.
- the oscillation frequency of the supply pressure P2 and the pumping frequency are not integer values of each other, the values taken by the admitted flow rate Q4 at each stroke are fairly dispersed. However, the average value is stable over a much lower cycle number than in the previous case.
- the oscillation frequency of the pressure P2 is particularly related to the frequency of oscillation of the flow Q4, itself directly related to the number of elements that comprises the high pressure pump 51 and at the speed of the pump system 5.
- the oscillation frequencies of the pressure P2 are related to the oscillation frequency of the flow Q3 and flow Q1.
- the frequency of oscillation of the flow rate Q3 depends, of course, on oscillations of the pressure difference across the flow actuator (P2 - P1), but also on oscillations in the passage section of the flow actuator, which are directly related to the frequency of the pulse modulation type control signal.
- the frequency of oscillations of the flow Ql is directly related to the number of elements of the low-pressure pump 50 and the speed of the pump system.
- the oscillations of the pressure of the rail 4 are due inter alia: the harmonics of the oscillations related to the discharge carried out by the low pressure pump 50 (related to the number of discharge elements that comprises the low pressure pump and the speed of the pump system 5); the harmonics of the oscillations of the pumping effected by the high-pressure pump 51 (related to the number of elements that the high-pressure pump comprises and the pumping rate); at the frequency F P W M of the pulse modulation type control signal of the actuator 9.
- the value of the flow rate Q4 admitted by the high-pressure pump 51 also depends on the phasing of the oscillations, that is to say of the angular relationship existing between the periods of discharge between at least two outputs of the high-pressure pump. 51.
- the choice of the frequency F P W M of the pulse modulation type control signal according to the speed of the pump system 5 must therefore fulfill the following conditions: the frequency F PWM is not too high, that is to say less than the natural frequency of the flow actuator, to guarantee the movement of the latter, the frequency F P W M must not be too slow (the lower limit being determined according to characteristics of the system engine fuel supply), so that there is no impact on the rail pressure; the F PWM frequency is not in the vicinity of an integer value of the suction frequency of the high-pressure pump (taking into account the speed of the pump); the F PWM frequency must not be in the vicinity of an integral value of the discharge frequency of the low-pressure pump (taking into account the pump speed). Moreover, for reasons of stability of the components and therefore of the behavior of the pump system 5, it is added that the frequency
- F PWM of the PWM control signal as a function of the pump speed shall also guarantee: not to be equal to the eigenfrequencies of the flow actuator (nor to the vicinity), so as to control the amplitude of the flow oscillations; not to be equal to the natural frequencies of the pressure limiter 54 (or in the vicinity), so as to control the amplitude of the oscillations of the pressure upstream of the flow actuator 9.
- the invention makes it possible to determine a frequency F PWM of the pulse modulation type control signal, achieving the best compromise on all of these criteria.
- One mode of implementation is detailed below.
- the inventors have observed that it is very advantageous to also take into account the fuel temperature conditions to modify the frequency F PWM of the control signal of the actuator, especially in the flow zones deemed critical, when the opening cycle ratio RCO is particularly high or particularly low. Indeed, it is when the temperature of the fuel is particularly low that the reaction time of the actuator is the longest and therefore the most harmful.
- the invention makes it possible to modify the frequency of the control signal when the fuel temperature is particularly low.
- the fuel temperature information TC is supplied to the auxiliary means 42 (see FIG. 1) by means of a sensor placed either at the inlet of the pump 5 or on the return circuit.
- Each map is associated with a function that makes it possible to determine the frequency of the control signal F PWM to be applied in engine speed function Nm.
- a calibratable critical threshold DCcr2 eg 90%
- mapping F2 The lower frequencies obtained from the mapping F2 will then allow the generation of micromovements of the piston of the actuator around a mean position. These micromovements play in favor of a strong reduction of overshoots of the rail pressure setpoint in the areas considered critical.
- the flowchart of FIG. 8 can be implemented within the auxiliary means 42.
- the flow rate of the fuel DC is compared with the critical values DCcrl and DCcr2 and the fuel temperature TC is compared with the critical temperature TCcr of the fuel, step 101. If the fuel flow is higher than the critical value associated DCcr2 or lower than the associated critical value DCcrl, and if the fuel temperature is lower than the associated critical value and if the fuel temperature is lower than the associated critical value, the frequency F PWM of the actuator control signal is developed from the mapping F2, step 102.
- step 104 the process is terminated, step 105, otherwise, steps 101 to 104 are repeated.
- the control of the actuator by varying the frequency F PWM of the control signal also applies to the pressure actuators that can be integrated into the fuel supply system.
- the mimic diagram of the regulation loop represented in FIG. 5 is adapted to the case of a pressure actuator: for example, the maps 30 and 33 are no longer dependent on the engine speed Nm and on the flow setpoint of the engine. DC fuel.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0655433A FR2909724B1 (fr) | 2006-12-12 | 2006-12-12 | Systeme d'alimentation en carburant pour moteur a combustion interne et procede de commande correspondant |
| PCT/EP2007/063258 WO2008071597A1 (fr) | 2006-12-12 | 2007-12-04 | Systeme d'alimentation en carburant pour moteur a combustion interne et procede de commande correspondant |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2102476A1 true EP2102476A1 (fr) | 2009-09-23 |
| EP2102476B1 EP2102476B1 (fr) | 2018-08-29 |
Family
ID=38289998
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP07847762.7A Active EP2102476B1 (fr) | 2006-12-12 | 2007-12-04 | Système d'alimentation en carburant pour moteur à combustion interne et procédé de commande correspondant |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP2102476B1 (fr) |
| FR (1) | FR2909724B1 (fr) |
| WO (1) | WO2008071597A1 (fr) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT201900010059A1 (it) * | 2019-06-25 | 2020-12-25 | Bosch Gmbh Robert | Sistema e metodo di controllo di una elettrovalvola di dosaggio in un gruppo di pompaggio per alimentare combustibile ad un motore a combustione interna |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4020654C2 (de) * | 1990-06-29 | 1999-12-16 | Bosch Gmbh Robert | Regelverfahren in Verbindung mit einer Brennkraftmaschine und/oder einem Kraftfahrzeug und Regelvorrichtung zur Durchführung des Regelverfahrens |
| DE69304234T3 (de) * | 1992-03-26 | 1999-07-15 | Zexel Corp., Tokio/Tokyo | Kraftstoff-Einspritzvorrichtung |
| JP4841772B2 (ja) * | 2001-09-28 | 2011-12-21 | いすゞ自動車株式会社 | コモンレール式燃料噴射制御装置 |
-
2006
- 2006-12-12 FR FR0655433A patent/FR2909724B1/fr not_active Expired - Fee Related
-
2007
- 2007-12-04 WO PCT/EP2007/063258 patent/WO2008071597A1/fr not_active Ceased
- 2007-12-04 EP EP07847762.7A patent/EP2102476B1/fr active Active
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2008071597A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2909724B1 (fr) | 2009-02-27 |
| EP2102476B1 (fr) | 2018-08-29 |
| FR2909724A1 (fr) | 2008-06-13 |
| WO2008071597A1 (fr) | 2008-06-19 |
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