• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to a method for estimating an angular position of a top dead center (25) for a high-pressure fuel injection pump forming part of an injection system in a motor vehicle engine , the pump comprising at least one piston moving in a chamber between top dead (25) and low dead points, the pump being equipped with a digital valve for controlling a quantity of fuel, an electric current being applied to the valve digital when closed and then canceled for the opening of the digital valve, a displacement of the digital valve towards its opening creating an induced current for detecting an opening opening position (23) of the digital valve. An instant of passage of the pump piston at the top dead center (25) is estimated as a function of the time of appearance of the opening opening position (23) of the digital valve.
    公开号:FR3060657A1
    申请号:FR1662526
    申请日:2016-12-15
    公开日:2018-06-22
    发明作者:Yves AGNUS；Nicolas Girard
    申请人:Continental Automotive GmbH；Continental Automotive France SAS；
    IPC主号:
    专利说明:

    Holder (s): CONTINENTAL AUTOMOTIVE FRANCE Simplified joint-stock company, CONTINENTAL AUTOMOTIVE GMBH.
    Extension request (s)
    Agent (s): CONTINENTAL AUTOMOTIVE FRANCE Simplified joint-stock company.
    METHOD FOR ESTIMATING A HIGH DEATH POINT FOR A HIGH PRESSURE PUMP OF A FUEL INJECTION SYSTEM IN A MOTOR VEHICLE ENGINE.
    FR 3 060 657 - A1 f5 /) The present invention relates to a method for estimating an angular position of a top dead center (25) for a high pressure fuel injection pump forming part of a system injection into a motor vehicle engine, the pump comprising at least one piston moving in a chamber between top (25) and bottom dead centers, the pump being equipped with a digital valve for controlling a quantity of fuel , an electric current being applied to the digital valve when it closes then canceled for the opening of the digital valve, a displacement of the digital valve towards its opening creating an induced current making it possible to detect a position of start of opening (23 ) of the digital valve. An instant of passage of the pump piston at top dead center (25) is estimated as a function of the instant of appearance of the opening start position (23) of the digital valve.

    The invention relates to a method for estimating an angular position of a top dead center for a high pressure fuel injection pump forming part of a fuel injection system in an internal combustion engine of motor vehicle. This estimation method is used in a method of synchronizing a high pressure fuel injection pump with the internal combustion engine of the vehicle.
    In this method of estimating an angular position of the top dead center of a high pressure fuel injection pump, the pump comprises at least one piston moving in a pump chamber between a top dead center for which a Chamber volume is lowest and a bottom dead center for which chamber volume is highest.
    Conventionally, a fuel injection system in an internal combustion engine comprises a low pressure fuel tank, a booster pump, a high pressure fuel injection pump supplied by the booster pump, a fuel controller. high pressure fuel injection pump, means for activating the high pressure fuel injection pump via a time control or via an angular control via the controller of the high pressure fuel injection pump and a control unit.
    The fuel injection system also comprises a common rail, serving as a high pressure fuel tank, supplied by said high pressure fuel injection pump, means for measuring the pressure in the common rail, injectors supplied with fuel. by said common rail and controlled by the control unit to inject the fuel into the cylinders of the internal combustion engine. The high pressure fuel injection pump is driven by the internal combustion engine.
    In such a high pressure fuel supply system, the fuel is transferred from the low pressure fuel tank to the high pressure fuel injection pump by the booster pump which works at low pressure. The fuel pressure in the common rail is controlled by a PID regulator (for Proportional, Integral, Derivative), called a high pressure fuel injection pump controller.
    This controller acts in combination with an actuator fitted to the high-pressure fuel injection pump, which allows to transfer to the common rail only the amount of fuel required according to the amount of fuel required by the engine control unit. For this, this actuator includes a valve called DIV valve for "Digital Inlet Valve" in English or digital intake valve, to transfer the desired amount of fuel in the common rail.
    The actuator rejects the fuel moved by the high pressure fuel injection pump and unwanted in the common rail to the supply circuit. The high pressure fuel injection pump is for example a rotary piston pump (s) driven in continuous rotation by the internal combustion engine.
    In what follows, the DIV valve will be called digital valve and its actuator comprising a DIV valve may be called subsequently digital valve actuator.
    The high-pressure fuel injection pump is phased between the piston or pistons thereof and the pistons of the internal combustion engine which drives it, for example between a top dead center of a piston of the engine and a top dead center of a piston of the high-pressure fuel injection pump, in order to allow the control of the exact quantity of fuel transferred in the common rail in relation to the position of the crankshaft. The digital valve actuator is activated by means of an electrical angular control, hereinafter called by extension angular control of the high pressure fuel injection pump, carried out with respect to a reference angle, i.e. -to say a command carried out at a precise angle of an axis of rotation of the high pressure fuel injection pump.
    This reference angle corresponds by construction to a position of the piston (s) of said pump, so that the digital valve closes at a precise position of the piston (s) of this corresponding high pressure fuel injection pump. to a determined volume of fuel that you want to transfer to the common rail.
    According to the state of the art, the reference angle is generally established at the top dead center of the high pressure fuel injection pump and defined by calibration. The phasing of the high pressure fuel injection pump is carried out by means of an initial calibration of the reference angle and then by learning this reference angle in order to take into account the mounting and sensor tolerances , in particular in the present case of the high pressure fuel injection pump and its drive mechanism by the internal combustion engine.
    If the phasing of the high-pressure fuel injection pump is incorrect, the amount of fuel transferred to the common rail is also incorrect, as well as, consequently, the pressure established therein.
    Still according to the state of the art, the phasing of the high pressure fuel injection pump is therefore the subject of a training based on a known manner on the detection of the integral part of the PID regulator or controller, in a certain angular window, by varying the theoretical position of the top dead center of the high pressure fuel injection pump. This phasing learning is carried out by the control unit. Alternatively, the rail pressure signal can be analyzed.
    The electrical control of the digital valve actuator is therefore calibrated so that the electrical well is positioned at the time of the desired closing of the digital valve relative to the position of the piston (s) of the fuel injection pump at high pressure, in order to obtain the transfer to the common rail of the quantity of fuel determined by the engine control unit. This electrical control naturally requires knowing the reference angle which is established as explained above. The sequencing of the electrical control is defined during the debugging. Such angular control naturally requires synchronization of the motor.
    The high pressure fuel injection pump is capable of being driven by the internal combustion engine.
    To be controlled with precision, the high pressure pumps must have a precisely known phasing. This phasing is generally carried out mechanically at the level of the engine distribution, in particular pinions, keys and toothed belt. However, there are still uncertainties related to the tolerances of all these components. This is the aim of the learning mentioned above.
    The learning solutions proposed by the state of the art generally require that the engine is already running and in a sufficiently stabilized manner to validate the measurement over several recurrences. This can cause a performance problem when starting the engine for the first time.
    In addition, in the event of an injector malfunction or in the event of a leak, the proposed learning methods do not converge on the actual phasing of the pump, which can reduce the performance of the injection system.
    The problem underlying the present invention is, for a high pressure pump in a fuel injection system of an internal combustion engine of a motor vehicle, to realize a phasing of the high pressure pump vis-à-vis of the internal combustion engine by estimating the top dead center of the high pressure pump.
    To this end, the present invention relates to a method for estimating an angular position of a top dead center for a high pressure fuel injection pump forming part of a fuel injection system in a combustion engine. internal of a motor vehicle, the pump comprising at least one piston moving in a pump chamber between a top dead center for which a volume of the room is the lowest and a bottom dead center for which a volume of the room is the lowest higher, the pump being equipped with a digital valve for controlling a quantity of fuel electrically controlled between an open position in which a high pressure part of the injection system is not supplied with fuel and a position of closure in which the high pressure part of the injection system is supplied with the digital valve then having a fully closed position, an electric current ique being applied to the digital valve when it is closed then canceled for the opening of the digital valve, a displacement of the digital valve towards its opening creating an induced current whose monitoring of the profile over time makes it possible to detect a start position opening of the digital valve and its instant of appearance, characterized in that the angular position at an instant of passage of the pump piston to the top dead center of the pump is estimated as a function of an angular position of the instant of the opening position of the digital valve opening.
    The relationship between the angular positions of the top dead center of a high pressure pump and of the start of opening of the digital valve can be considered to be known from the state of the art. However, an estimate of the angular position of the top dead center of the high pressure pump has never been implemented as a function of the position of start of opening of the digital valve and it is rather the reverse approach for an estimate. of the angular position of start of opening of the digital valve which was implemented by the state of the art.
    The invention therefore consists in using the current profile during the starting phase as soon as the motor is synchronized. We can therefore determine the opening start position from the first pump strokes under the starter before the injection is even activated. Indeed, once the position of start of opening of the digital valve is located, it can be deduced the angular position of the top dead center of the pump which is located a few degrees before the position of start of opening of the digital valve.
    Advantageously, the estimation of the angular position at the instant of transition to top dead center as a function of the instant of appearance of the position of start of opening of the digital valve takes account of at least one of the following parameters : the pressures upstream and downstream of the pump, the elasticity modulus of the fuel which depends on its temperature and its pressure, on the technical characteristics of the pump such as its dead volume and its displacement.
    Indeed, there is a delay between the instant of shifting to top dead center and the position of opening start. This delay is due to the expansion of the fuel and the parameters previously mentioned make it possible to quantify this expansion of the fuel according to the prevailing conditions and the fuel parameters.
    Advantageously, the pressures upstream and downstream of the pump are measured, the modulus of elasticity of the fuel is a datum of the fuel supplier while the temperature of the fuel is modeled and its pressure measured and the technical characteristics of the pump are pump manufacturer data.
    Advantageously, the position of the start of opening of the digital valve results in the appearance of an inflection point on a curve for monitoring the profile of the induced current, the instant of appearance of the inflection point being taken as instant of the opening position of the digital valve opening.
    Advantageously, the digital valve comprises a valve returned to the open position by a return element, the digital valve opening as soon as the fuel pressure in the chamber becomes lower than the pressure exerted by the return element on the digital valve flap.
    Advantageously, the digital valve is activated according to an electrical angular control.
    The invention relates to a phasing method of a high pressure fuel injection pump forming part of a fuel injection system in an internal combustion engine of a motor vehicle, an occurrence of the top dead center of the pump being synchronous with the motor, characterized in that it implements such a method of estimating an angular position of the top dead center for the pump.
    By synchronous, it is understood that a top dead center event of the pump recurs periodically in the motor cycle.
    Advantageously, the appearance of a top dead center of the pump is in phase with the appearance of a top dead center of a piston of the engine.
    The method of estimating the angular position of the top dead center as previously described makes the phasing process more reliable and faster than those of the state of the art.
    The invention finally relates to a fuel injection system in an internal combustion engine of a motor vehicle comprising a high pressure fuel injection pump and a control unit, the pump comprising at least one piston moving in a chamber and being equipped with a digital valve for controlling a fuel flow controlled by the control unit via an electrical control element connected to the digital valve by an electrical circuit, characterized in that it implements such a method for estimating an angular position of a top dead center of the pump or such a phasing process, the control unit comprising an element for monitoring an induced current in the electrical circuit when the digital valve and for detecting a position for the start of opening of the digital valve and its instant of appearance and an element for calculating the instant of passage of the pist on from the pump to the top dead center of the pump as a function of the instant of appearance of the start position for opening the digital valve.
    Advantageously, the high pressure pump is supplied by a booster pump and supplies a common rail forming a high pressure fuel tank, the common rail comprising at least one fuel pressure sensor inside and supplying fuel to a fuel injector for each cylinder of the internal combustion engine, the high pressure pump being driven the internal combustion engine.
    The solution presented by the present invention does not require an additional sensor, nor any hardware modification of the control unit of which the engine control can be a part. It allows very rapid detection of the pump phasing even before the first injection. The preferred check is carried out by an engine control control unit but an after-sales service check can also be performed routinely via a diagnostic socket connected to the control unit, in particular to engine control.
    Other characteristics, objects and advantages of the present invention will appear on reading the detailed description which follows and with regard to the appended drawings given by way of nonlimiting examples and in which:
    - Figure 1 is a schematic representation of a view of an embodiment of a high pressure fuel supply system of an internal combustion engine, this system being provided with a high pressure injection pump in fuel for which an angular position of the top dead center can be estimated in accordance with an estimation method according to the present invention,
    - Figure 2 is a schematic representation of a sectional view of a high pressure fuel injection pump that can implement the method for estimating an angular position of the top dead center of the pump according to the present invention ,
    - Figure 3 shows two respective curves of current at the digital valve and pressure in the common rail of the high pressure part of the injection system with identification of an angular position of the top dead center of the pump and the start of opening of the digital valve, a detection of an angular position of the top dead center of the pump according to the position of start of opening of the digital valve being implemented in accordance with the estimation method according to the present invention,
    - Figure 4 shows two current curves respectively relating to one of two digital valves having a phase shift between them, the two curves having positions of start of opening combined, the two digital valves having the same angular positions for a top dead center estimated according to the method according to the present invention.
    Referring more particularly to FIG. 1, a system 1 for injecting high pressure fuel from an internal combustion engine comprises a booster pump 2, which takes the fuel at low pressure from a reservoir 3 of fuel at low pressure , a high pressure pump 4 with fuel injection being supplied by the booster pump 2. This high pressure pump 4 includes an actuator for a digital valve, not shown in FIG. 1 but being in FIG. 2 and which will be later detailed.
    The injection system 1 also comprises a controller 5 of the high pressure pump 4 for fuel injection, and more particularly of the digital valve actuator and means for activating the high pressure injection pump 4 via a time control or via an angular command via the controller 5 of the high pressure pump 4 with fuel injection and an engine control unit 6, the time command being mainly used just after starting the motor vehicle.
    The injection system 1 also comprises a common high pressure fuel tank or rail 7 supplied by the high pressure fuel injection pump 4, the common rail 7 being provided with means 8 for measuring the pressure. Injectors 9 are supplied with fuel by the common rail 7 and controlled by the engine control unit 6 to inject the fuel into the cylinders 11 of the internal combustion engine 12.
    The high pressure fuel injection pump 4 can be able to be driven in a known manner by a drive means, not shown in FIG. 1, with the internal combustion engine 12, for example a link mechanism by mechanical transmission, like chain, gears, belt or the like.
    Figure 2 shows a high pressure fuel injection pump 4 for the injection system shown in Figure 1. This pump 4 includes a pump housing 14. The casing 14 of the pump 4 houses inside a piston 19 returned by a spring 20, the piston 19 being driven by a drive mechanism 21 with cam.
    The pump casing 14 has at its upper end a displacement unit 15 housing a digital valve 13 or DIV valve. The unit 15 comprises a supply pipe 18 and a return pipe from and to the booster pump as well as an outlet pipe 17 towards the common rail, this outlet pipe comprising a non-return valve 16.
    When the digital valve 13 is in the open position, the piston 19 sucks fuel from the supply line 18 into a cylinder while the non-return valve 16 of the outlet line 17 is closed.
    At the end of the filling phase, the digital valve 13 is still in the open position, the piston 19 pushes fuel through the supply line 18 towards the booster pump, that is to say the low pressure part of the system d injection while the outlet non-return valve 16 of the outlet conduit 17 remains closed. This allows the excess fuel to be returned to the low pressure part of the injection system.
    Then, the digital valve 13 is electrically controlled to close, the supply duct 18 then being closed, the piston 19 pushes fuel in the outlet duct 17 towards the common rail, that is to say towards the upper part injection system pressure, the non-return valve 16 of the outlet conduit 17 then being open.
    Figure 3 illustrates two curves as a function of time. The first curve 26 illustrates the current supplying the digital valve and the second curve 27 illustrates the pressure in the common rail, that is to say in the high pressure part of the injection system. The framed part 28 represents a window for measuring the position of start of opening 23 of the digital valve and a fully open position 24 of this digital valve by showing pulses of current when the digital valve opens.
    The top dead center 25 of the pump is recognizable at the end of the pressure increase in the common rail, while the start of opening of the digital valve is recognizable at a point of inflection on the pulsed current curve.
    As previously mentioned, in order to be controlled with precision, the phasing of a high pressure pump equipping a high pressure fuel injection system must be known precisely. The phasing is generally ensured mechanically with the engine but there remain uncertainties related to the tolerances of all these components. It is therefore necessary to estimate an angular position of the top dead center of the high pressure pump quickly and precisely.
    The present invention makes it possible to adapt the phasing more quickly from the first revolutions of the engine by using a reading of the current induced by the digital valve for controlling the fuel flow to the high pressure part of the injection system. This is done by detection of the start of opening of the digital valve and a deduction of the position of an angular position of the top dead center of the pump from the first turns of the engine.
    FIG. 4 shows two substantially superimposed curves of current supplying respectively a correctly phased digital valve and a phase-shifted digital valve. FIG. 4 therefore makes it possible to establish a comparison between the supply current of a digital valve of a correctly phased high pressure pump with that of a pump whose reference angle is biased, in this figure of 10 °. which is not limiting.
    During this comparison, it is noted that the current profile generated by the control unit is different. On the other hand, the opening start time 23 of the phased or phase-shifted digital valve is in the same place in both cases because it corresponds to a physical phenomenon: the reopening of the digital valve when the piston descends just after neutral top of the pump.
    The opening start position 23 of the digital valve is therefore independent of the reference angle of the digital valve. This therefore makes it possible to reliably estimate, for the same type of digital valve, an angular position of the top dead center of the high pressure pump which houses it, independently of the phase shift of this digital valve and whatever its programmed angle.
    Referring to all the figures, the present invention relates to a method for estimating an angular position of a top dead center 25 for a high pressure fuel injection pump 4 forming part of an injection system 1 of fuel in an internal combustion engine 12 of a motor vehicle. The pump 4 comprises at least one piston 19 moving in a chamber of the pump 4 between a top dead center 25 for which a volume of the room is the lowest and a bottom dead center for which a volume of the room is the most Student.
    Such a pump 4 is equipped with a digital valve 13 for controlling an amount of fuel electrically controlled between an open position in which a high pressure part of the injection system 1 is not supplied with fuel and a position closure in which the high pressure part of the injection system 1 is supplied with the digital valve 13 then having a fully closed position.
    To do this, an electric current is applied to the digital valve 13 when it is closed and then canceled for the opening of the digital valve 13, a displacement of the digital valve 13 between its closed position and its open position creating a induced current whose monitoring of the profile over time makes it possible to detect an opening start position 23 of the digital valve 13 and its instant of appearance.
    According to the invention, an angular position of an instant of passage of the piston 19 of the pump 4 to the top dead center 25 of the pump 4 is estimated as a function of an angular position of the instant of appearance of the position of start of opening 23 of the digital valve 13.
    The engine control unit 6 applies a current to the digital valve 13 to close it at the time between the bottom dead center and the top dead center 25 of the pump 4 during the phase during which it is desired to compress fuel in the pump 4. This current is released a little before top dead center 25 as shown in FIGS. 3 and 4. The compression of the fuel keeps the digital valve 13 closed.
    Once the angular position of the top dead center 25 of the pump 4 is exceeded, the digital valve 13 will open naturally as soon as the pressure in the cylinder of the pump 4 becomes less than the force applied by a return element 22 of the valve digital 13.
    In particular, during the first piston strokes 19, as the pressure in the common rail 7 is low, the difference between the instants of passage of the top dead center 25 and of the start of opening 23 of the digital valve 13 is also very small , hence an even lower uncertainty and therefore a preferred instant for estimating an angular position of the top dead center 25.
    If a current of predetermined intensity is applied, it is possible to determine through the current induced by the movement of the digital valve 13 the moment when the digital valve 13 will start to open, that is to say tell the start of opening 23 of the digital valve 13 as well as the fully open position 24 of the digital valve 13.
    The estimation of an angular position of the instant of passage to top dead center 25 as a function of an angular position of the instant of appearance of the position of start of opening 23 of the digital valve 13 can take account at least one of the following parameters: the pressures upstream and downstream of the pump 4, the modulus of elasticity of the fuel which depends on its temperature and its pressure, the technical characteristics of the pump 4 such as its dead volume and its displacement.
    The pressures upstream and downstream of the pump 4 can be measured respectively in the booster pump 2 and in the common rail 7. The elasticity modulus of the fuel is a datum of the fuel supplier while the temperature of the fuel can be modeled and its pressure measured. The technical characteristics of pump 4 are known by being data communicated by the manufacturer of pump 4.
    As can be seen in FIGS. 3 and 4 while referring to all the figures for the numerical references, the position of start of opening 23 of the digital valve 13 can result in the appearance of an inflection point on a curve for monitoring the profile of the induced current. It is this instant of appearance of the inflection point which is taken as the instant of appearance of the opening start position 23 of the digital valve 13. The induced current passes through an inflection point, for example in decreasing appreciably by passing through a point of inflection which signals the position of start of opening 23 then by going up through a maximum which signals the fully open position 24 of the digital valve 13.
    The digital valve 13 may include a valve returned to the open position by a return element 22. The digital valve 13 opens as soon as the fuel pressure in the chamber becomes lower than the pressure exerted by the return element on the valve of the digital valve 13. This causes a delay between the angular positions of the top dead center 25 and the opening start position 23 of the digital valve.
    The digital valve 13 can be activated according to an electrical angular control. The electrical angular control requires synchronization of the pump 4 with the internal combustion engine 12. The angular control can follow a crankshaft angle of the internal combustion engine 12.
    An angular control of the high pressure fuel injection pump 4 can be carried out in a known manner by means of a plurality of electrical pulses, for example of the type maintaining peak values also known under the Anglo-Saxon name of "Peak and Hold ”for a specified number of segments.
    The determination of the top dead center 25 of the pump 4 is used for the phasing of the high pressure pump 4 with respect to the internal combustion engine 12, advantageously but not only by correspondence of the top dead center 25 of the pump 4 with a point dead top of an engine piston 12.
    The invention therefore relates to a phasing process of a high pressure fuel injection pump 4 forming part of a system 1 for injecting fuel into an internal combustion engine 12 of a motor vehicle. In this phasing process, an appearance of the top dead center 25 of the pump 4 is synchronous with the motor 12, advantageously in phase with an appearance of a top dead center of a piston of the engine 12. This process of phasing the pump uses a method for estimating an angular position of the top dead center 25 for the pump 4 as described above.
    The invention finally relates to a system 1 for injecting fuel into an internal combustion engine 12 of a motor vehicle comprising a pump 4 for injecting high pressure fuel and a control unit 5, 6. The control unit may comprise a controller 5 specific to the high pressure pump 4 with fuel injection and an engine control unit 6 with broader attributions concerning the operation of the thermal combustion engine 12 and in particular the injection of fuel into the engine 12.
    The pump 4 comprises at least one piston 19 moving in a chamber and is equipped with a digital valve 13 for controlling a fuel flow controlled by the control unit 5, 6 via an electrical control element connected to the digital valve 13 by an electrical circuit.
    According to the invention, the injection system 1 implements a method for estimating an angular position of a top dead center 25 of the pump 4 or a phasing method as described above. The control unit 5, 6 and more particularly the pump-specific controller 5 includes an element for monitoring an induced current in the electrical circuit when the digital valve 13 is opened and for detecting a position of start of opening 23 of the digital valve 13 and its instant of appearance.
    The control unit 5, 6 also comprises an element for calculating the instant of passage of the piston 19 of the pump 4 to the top dead center 25 of the pump 4 as a function of the instant of appearance of the start position 23 of the digital valve 13.
    权利要求:
    Claims (10)
    [1" id="c-fr-0001]
    1. Method for estimating an angular position of a top dead center (25) for a high pressure fuel injection pump (4) forming part of a fuel injection system (1) in an engine (12) internal combustion of a motor vehicle, the pump (4) comprising at least one piston (19) moving in a chamber of the pump (4) between a top dead center (25) for which a volume of the chamber is the lowest and a bottom dead center for which the volume of the chamber is the highest, the pump (4) being equipped with a digital valve (13) for controlling a quantity of fuel fuel flow electrically controlled between a open position in which a high pressure part of the injection system is not supplied with fuel and a closed position in which the high pressure part of the injection system is supplied with the digital valve (13) then having a fully fe position rmée, an electric current being applied to the digital valve (13) during its closing then canceled for the opening of the digital valve (13), a displacement of the digital valve (13) towards its opening creating an induced current whose monitoring the profile over time makes it possible to detect a position of start of opening (23) of the digital valve (13) and its instant of appearance characterized in that an angular position at an instant of passage of the piston (19) of the pump (4) at the top dead center (25) of the pump (4) is estimated as a function of an angular position at the instant of the appearance of the start of opening position (23) of the digital valve (13).
    [2" id="c-fr-0002]
    2. Method according to the preceding claim, wherein the estimation of the angular position at the instant of passage to top dead center (25) as a function of the angular position at the instant of appearance of the start position of opening (23) of the digital valve (13) takes account of at least one of the following parameters: the pressures upstream and downstream of the pump (4), the modulus of elasticity of the fuel which depends on its temperature and its pressure, technical characteristics of the pump (4) such as its dead volume and its displacement.
    [3" id="c-fr-0003]
    3. Method according to the preceding claim, in which the pressures upstream and downstream of the pump (4) are measured, the modulus of elasticity of the fuel is a datum of the fuel supplier while the temperature of the fuel is modeled and its pressure measured and the technical characteristics of the pump (4) are data from the manufacturer of the pump (4).
    [4" id="c-fr-0004]
    4. Method according to any one of the preceding claims, in which the opening start position (23) of the digital valve (13) results in the appearance of an inflection point on a profile tracking curve. of the induced current, the instant of appearance of the inflection point being taken as instant of appearance of the position of start of opening (23) of the digital valve (13).
    [5" id="c-fr-0005]
    5. Method according to any one of the preceding claims, in which the digital valve (13) comprises a valve returned to the open position by a return element (22), the digital valve (13) opening as soon as the fuel pressure in the chamber becomes lower than the pressure exerted by the return element on the valve of the digital valve (13).
    [6" id="c-fr-0006]
    6. Method according to any one of the preceding claims, in which the digital valve (13) is activated according to an electrical angular control.
    [7" id="c-fr-0007]
    7. Method for phasing a high pressure fuel injection pump (4) forming part of a system (1) for injecting fuel into an internal combustion engine (12) of a motor vehicle, an appearance of the point top dead (25) of the pump (4) being synchronous with the motor (12), characterized in that it implements a method for estimating an angular position of the top dead center (25) for the pump ( 4) according to any one of the preceding claims.
    [8" id="c-fr-0008]
    8. A phasing method according to the preceding claim, in which the appearance of a top dead center (25) of the pump (4) is in phase with an appearance of a top dead center of a piston of the engine.
    [9" id="c-fr-0009]
    9. System (1) for injecting fuel into an internal combustion engine (12) of a motor vehicle comprising a high pressure fuel injection pump (4) and a control unit (5, 6), the pump ( 4) comprising at least one piston (19) moving in a chamber and being equipped with a digital valve (13) for controlling a fuel flow controlled by the control unit (5, 6) via a electrical control connected to the digital valve (13) by an electrical circuit, characterized in that it implements a method for estimating an angular position of a top dead center (25) of the pump (4) according to any one of claims 1 to 6 or a phasing method according to claim 7 or 8, the control unit (5, 6) comprising an element for monitoring an induced current in the electric circuit during opening of the digital valve (13) and of detection of an opening start position (2 3) of the digital valve (13) and of its instant of appearance and an element for calculating the instant of passage of the piston (19) of the pump (4) to the top dead center (25) of the pump (4 ) as a function of the instant of appearance of the opening start position (23) of the digital valve (13).
    [10" id="c-fr-0010]
    10. An injection system (1) according to the preceding claim, in which the high pressure pump (4) is supplied by a booster pump (2) and supplies a common rail (7) forming a high pressure fuel tank, the common rail (7) comprising at least one fuel pressure sensor inside and supplying fuel to a fuel injector for each cylinder of the internal combustion engine (12), the high pressure pump (4) being driven by the engine ( 12) combustion
    5 internal.
    1/3
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    同族专利:
    公开号 | 公开日
    US10837383B2|2020-11-17|
    CN110062843A|2019-07-26|
    FR3060657B1|2020-12-25|
    CN110062843B|2021-12-28|
    WO2018109359A1|2018-06-21|
    US20190353110A1|2019-11-21|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    EP1873382A2|2002-06-20|2008-01-02|Hitachi, Ltd.|Control device of high-pressure fuel pump of internal combustion engine|
    DE102010030447A1|2010-06-23|2011-12-29|Bayerische Motoren Werke Aktiengesellschaft|Method for determining position of top dead point in HDP5 in combustion engine for direct injection of petrol, involves determining opening point by measuring electrical variable in electrical current supply path for solenoid coil|
    JP2014001738A|2013-09-02|2014-01-09|Hitachi Automotive Systems Ltd|High pressure fuel pump control device of internal combustion engine|
    DE102014219459A1|2013-10-01|2015-04-02|Ford Global Technologies, Llc|HIGH-PRESSURE FUEL PUMP CONTROL FOR REDUCING TIRE ROLLERS IN LOOP|
    US20150337783A1|2014-05-21|2015-11-26|Ford Global Technologies, Llc|Direct injection pump control for low fuel pumping volumes|
    JP2008215321A|2007-03-08|2008-09-18|Hitachi Ltd|High pressure fuel pump control device for internal combustion engine|
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    DE102011075271B4|2011-05-04|2014-03-06|Continental Automotive Gmbh|Method and device for controlling a valve|
    DE102014223322A1|2014-11-14|2016-05-19|Robert Bosch Gmbh|Method for detecting the pump orientation of a high-pressure fuel pump|GB2575275A|2018-07-04|2020-01-08|Delphi Tech Ip Ltd|A method of determining the functionality of an NRV in a high pressure fuel pump system|
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    CN110595339B|2019-08-09|2021-04-02|上海柏楚电子科技股份有限公司|Method for measuring center of circular arc symmetric metal pipe|
    法律状态:
    2017-12-21| PLFP| Fee payment|Year of fee payment: 2 |
    2018-06-22| PLSC| Publication of the preliminary search report|Effective date: 20180622 |
    2019-12-19| PLFP| Fee payment|Year of fee payment: 4 |
    2020-12-23| PLFP| Fee payment|Year of fee payment: 5 |
    2021-04-16| TP| Transmission of property|Owner name: CONTINENTAL AUTOMOTIVE FRANCE, FR Effective date: 20210309 Owner name: CONTINENTAL AUTOMOTIVE GMBH, DE Effective date: 20210309 |
    2021-12-24| PLFP| Fee payment|Year of fee payment: 6 |
    2022-02-11| CA| Change of address|Effective date: 20220103 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1662526|2016-12-15|
    FR1662526A|FR3060657B1|2016-12-15|2016-12-15|METHOD OF ESTIMATING A HIGH NEUTRAL POINT FOR A HIGH PRESSURE PUMP OF A FUEL INJECTION SYSTEM IN A MOTOR VEHICLE ENGINE|FR1662526A| FR3060657B1|2016-12-15|2016-12-15|METHOD OF ESTIMATING A HIGH NEUTRAL POINT FOR A HIGH PRESSURE PUMP OF A FUEL INJECTION SYSTEM IN A MOTOR VEHICLE ENGINE|
    US16/470,023| US10837383B2|2016-12-15|2017-12-12|Method for estimating a top dead centre for a high-pressure pump of a fuel injection system in an automotive vehicle engine|
    PCT/FR2017/053516| WO2018109359A1|2016-12-15|2017-12-12|Method for estimating a top dead centre for a high-pressure pump of a fuel injection system in an automotive vehicle engine|
    CN201780077709.3A| CN110062843B|2016-12-15|2017-12-12|Method for estimating top dead center of high-pressure pump of fuel injection system in motor vehicle engine|
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