• 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:
    Summary The present invention relates to a high pressure fuel pump (12) comprising an inlet duct (14) in connection with a first chamber (16) through which fuel is directed to the first chamber (16), a second chamber (18) arranged in connection with the first chamber ( 16), an outlet valve (40) arranged in connection with the second chamber (18) and an inlet valve (20) comprising a piston (22) with a first duck portion (24) and a second duck portion (26). The piston (22) is movably arranged with the first duck portion (24) in a third chamber (28) and the second duck portion (26) is movably arranged between the first chamber (16) and the second chamber (18). A pressing member (34) is arranged to act on the piston (22) by means of a mechanical force (Fe), so that the piston (22) strives after positioning with the second end portion (26) striking the connection between the first chamber (16) and the second chamber (18). Thus, the inlet valve (20) is in a closed bearing. The inlet valve (20) is controllable by an electromagnetic unit (38).
    公开号:SE1451061A1
    申请号:SE1451061
    申请日:2014-09-15
    公开日:2016-03-16
    发明作者:Kim Kylström
    申请人:Scania Cv Ab；
    IPC主号:
    专利说明:

    TECHNICAL FIELD The present invention relates to a high pressure fuel pump for a fuel system, fuel system with such a high pressure fuel pump, internal combustion engine with such a high pressure fuel pump, vehicles with such a high pressure fuel fuel pump and a high pressure fuel engine.
    BACKGROUND OF THE INVENTION AND KNOWLEDGE TECHNOLOGY Internal combustion engines, such as diesel or otto engines, are used in several types of applications and vehicles today, for example in heavy vehicles, such as trucks or buses, cars, motor boats, ships, ferries or ships. Internal combustion engines are also used in industrial engines and / or motor-driven industrial robots, power plants, such as e.g. electric power plants that include a diesel generator, and in locomotives.
    Internal combustion engines can be powered by diesel or petrol. These engines are equipped with a fuel system to transport the fuel from one or more fuel tanks to the internal combustion engine injection system. The fuel system comprises one or more fuel pumps which can be mechanically driven by the internal combustion engine or driven by an electric motor. The fuel pumps create a fuel flow and pressure to transport the fuel to the internal combustion engine's injection system, which thaws & the fuel to the internal combustion engine's combustion chamber.
    Fuel systems may include one or more low pressure fuel pumps, which operate in a low pressure circuit having the fuel system and supplying fuel to a high pressure fuel pump. The high-pressure fuel pump is arranged to have a 2 high-pressure circuit in the fuel system and further supplies the fuel to the injection system of the internal combustion engine. In order to control the fuel flow into the high-pressure fuel pump, and thus the fuel flow to the internal combustion engine, there is normally an inlet valve arranged in connection with the high-pressure fuel pump. With an active controllable inlet valve, the fuel flow that is fed on to the internal combustion engine can be controlled in a controlled and accurate manner. Should the active inlet valve not work, for example due to an electrical fault, no fuel is supplied to the high-pressure fuel pump and the high-pressure fuel pump cannot pump further fuel to the internal combustion engine, whereby the internal combustion engine is shut off. An industry system with an active inlet valve is thus probable and can cause unwanted operational disturbances.
    Document DE102012207744 shows a fuel system with an active controllable valve arranged in connection with the high-pressure fuel pump. When the valve does not work, an alternative fuel supply is achieved by pulsing the feed pressure of a low-pressure fuel pump. This solution assumes that the valve is normally in a tipped position.
    Despite well-known readings in the field, there is still a need to further develop a high-pressure fuel pump which securely ensures that fuel can be fed to the internal combustion engine, even if a controllable valve stops working. SUMMARY OF THE INVENTION The object of the present invention is to provide a high pressure fuel pump in a fuel system for an internal combustion engine, which enables both passive and active control of the fuel flow to the internal combustion engine. By passive control is meant control that does not require power supply and by active control is meant control that requires power supply. The object of the invention is also to provide a high-pressure fuel pump in a fuel system called a combustion engine, which results in a redundancy in the event of loss of active control.
    A further object of the invention is to provide a high pressure fuel pump in a fuel system for an internal combustion engine which minimizes the risk of malfunctions.
    It is a further object of the present invention to provide a process for a high pressure fuel pump in an internal combustion engine fuel system which minimizes the risk of malfunctions.
    These objects are achieved with a high pressure fuel pump as defined in claim 1 and a method of such a high pressure fuel pump as defined in claim 12.
    According to the invention, the above objects are achieved with a high-pressure fuel pump for a fuel system, suitably of an internal combustion engine, comprising an inlet duct in communication with a first chamber and through which fuel is led to the first chamber with a feed pressure P, a second chamber arranged in connection with the first chamber , an outlet valve arranged in connection with the second chamber and an inlet valve comprising a piston with a first duck portion and a second duck portion, the piston being movably arranged with the first duck portion in a third chamber and the second duck portion being movably arranged between the first chamber and the second chamber. Furthermore, a pressing means is arranged to act on the piston by means of a mechanical force, so that the piston strives to be positioned with the second end portion closing the connection between the first chamber and the second chamber and so that the inlet valve is thereby in a closed position, the inlet valve being controllable in that an electromagnetic unit is arranged in the third chamber, in order to act with a magnetic force on the first end portion of the piston 4, so that the piston moves. By the mechanical force in this application is meant the force provided by the press member.
    The invention also relates to an internal combustion engine and a vehicle comprising the high-pressure fuel pump described above.
    According to another aspect, the invention relates to a method of a high pressure fuel pump in a fuel system for an internal combustion engine, comprising an inlet duct in connection with a first chamber and through which fuel is led to the first chamber with a feed pressure P, a second chamber arranged in connection with the first the chamber and an outlet valve arranged in communication with the second chamber, the inlet valve comprising a piston with a first duck portion and a second duck portion, the piston being movably arranged with the first duck portion in a third chamber and the second duck portion movably between the first chamber and the second chamber. second chamber. The method comprises the steps of: - providing a pressing means arranged to act on the piston by means of a mechanical force, so that the piston strives to be positioned with the second end portion closing the connection between the first chamber and the second chamber and so that the inlet valve is thereby in a rod lage; and - controlling the inlet valve by means of an electromagnetic unit arranged in the third chamber, which acts with a magnetic force on the piston of the inlet valve, the piston moving.
    DETAILED DESCRIPTION OF THE INVENTION The invention is described below with reference to the high pressure fuel pump and method generally described above.
    A fully active controllable inlet valve for a high-pressure fuel pump is susceptible to malfunctions and can cause downtime if the active control does not work satisfactorily. With a completely passive inlet valve on the other hand, an equally accurate and controlled control of the fuel flow to the high-pressure fuel pump is not achieved when an active inlet valve is used. By arranging a pressing member, such as a spring member, to act passively on the piston of the inlet valve and an electromagnetic unit to actively act on the piston of the inlet valve, an inlet valve is provided, which can be controlled both actively and passively. The pressing member is suitably arranged to act on the first end portion of the piston in order to achieve maximum mechanical force. Correspondingly, the magnetic force obtained via the electromagnetic unit is arranged to act on the first end portion of the piston. In this way, a high-pressure fuel pump is provided, which enables both passive and active control of the fuel flow to the internal combustion engine and thus minimizes the risk of operational disturbances.
    By high pressure fuel pump is meant hari in a pump with a high supply pressure, which can vary between about 1000-2500 bar, but is not limited to this range.
    Lamp is fed from the legal pressure circuit of the fuel system to the inlet duct and the first chamber. The feed pressure causes a tidal force acting on the piston in a direction opposite to the mechanical force. The feed pressure to act on the piston is determined based on the performance of the pump and the geometric dimensions of the inlet valve and a force balance between these and can be determined in advance. 6 The supply pressure is suitably achieved with an electric motor-controlled low-pressure pump arranged in the low-pressure circuit of the fuel system. Because the low-pressure pump is electrically motor-controlled, a wider control range is allowed with a mechanical pump, which is usually driven and controlled by the internal combustion engine and above all by the speed of the internal combustion engine. The electric motor-controlled low-pressure pump can be controlled against parameters other than the engine speed, such as the industry filter degree of filling and the pressure in the industry lines.
    The magnetic force acting on the piston is conveniently provided by conducting electric current through the electromagnetic unit. This provides a magnetic field and thus a magnetic force which pulls the piston towards the electromagnetic unit. The electromagnetic field can be achieved, for example, with the aid of an actuator, such as an electromagnetic coil or a piezo element. The piston may also comprise a magnetic material, such as metal, such as stainless steel.
    According to one aspect of the present invention, the electromagnetic unit is arranged to act with the magnetic force on the piston in a direction opposite to the mechanical force, which is preferably spring force, in order thus to provide a tip-low shaft inlet valve. The mechanical force can also be provided by pneumatic devices or hydraulic devices. Thus, the magnetic force on the piston acts in the same direction as the river force. The mechanical force acts passively on the piston in a direction which causes a closed bearing shaft inlet valve, the connection between the first chamber and the second chamber being closed and no fuel can be fed further through the outlet valve to the internal combustion engine. In order to achieve a tipped layer, the inlet valve must thus exceed the sum of the magnetic force and the river force by the mechanical force. The magnetic force depends on the electric current conducted through the electromagnetic device. By controlling the supply of the electric current, the inlet valve can thus be actively controlled to a tipped bearing and fuel supply to the internal combustion engine can thus be achieved in a precise and flexible manner. To provide the closed layer, the supply of the electric current is controlled so that the magnetic force becomes zero, whereby the mechanical force moves the piston to the closed layer. In cases where the electromagnetic unit does not work and the magnetic force is thus essentially zero, a tip layer of the inlet valve can be achieved by ensuring that the flow force exceeds the mechanical force. The flow force is suitably increased by controlling the low pressure pump so that the feed pressure exceeds a predetermined feed pressure which is determined based on the pump's performance and the geometric dimensions of the piston and can for example be about 6 bar. By increasing the supply pressure on the Iran long-range circuit and thereby increasing the tidal force, a tip layer at the inlet valve can be achieved even when the electromagnetic unit fails and redundancy is thereby obtained. This ensures that fuel can be fed to the internal combustion engine when needed, and the risk of malfunctions is minimized.
    According to one aspect of the present invention, the electromagnetic unit is arranged to act with the magnetic force on the piston in the same direction as the mechanical force, in order to provide a closed bearing of the inlet valve. The magnetic force thus acts on the piston in the opposite direction to the tidal force. In order to achieve an open position of the inlet valve, the surface force must therefore exceed the magnetic force and the mechanical force. When the internal combustion engine is in need of fuel, it is ensured that no electric current is conducted through the electromagnetic unit, so that the magnetic force acting on the piston is negligible. The flood force must therefore only exceed the mechanical force in order to achieve an open low inlet valve. By arranging a pressing member which acts with a mechanical force which is lower than the tidal force caused by a normal supply pressure, a tipped layer has the inlet valve passively provided when the magnetic force is negligible. The mechanical force, for example the spring force with which a spring member acts on the piston, is determined in advance based on the performance of the pump and the dimensions of the piston.
    In cases where the electromagnetic unit does not work and the magnetic force is thus essentially nailed, thus a tip low has the inlet valve 8 can be provided by the flood force exceeding the mechanical force, such as the spring force. This ensures that fuel can be fed to the internal combustion engine when needed, and the risk of operational disturbances is minimized.
    According to an aspect of the present invention, the electromagnetic unit is arranged to act with the magnetic force on the piston in the same direction as the mechanical force, preferably the spring force, according to the above, a passage being arranged between the inlet channel and the third chamber. Firewood fed through the inlet duct can thus flow to the third chamber.
    The fuel is fed into Iran's legal pressure circuit. In this way, fuel acts both on the first duck portion and the second duck portion has the piston. Thus, the industry operates on a larger total area of the piston and thus a greater tidal force is achieved without the passage.
    Preferably, the outlet valve is constituted by a non-return valve.
    Lamply, a pressure means is movably arranged in the second chamber in connection with a camshaft having the internal combustion engine. The pressure means is arranged to increase the pressure of the fuel in the second chamber and thereby feed the fuel through the outlet valve. When the camshaft rotates, the pressure member is moved in the second chamber. When the pressure means is moved in the direction of the first chamber and the inlet valve is in a closed position, the volume of the second chamber is reduced, whereby the pressure on the fuel in the second chamber increases. The outlet valve is thus continued in a tipped position and the fuel in the second chamber can be fed on to the internal combustion engine. When the pressure means is moved in a direction opposite to the first chamber, the inlet valve is directed to a tipped bearing whereby fuel can flow Iran from the first chamber to the second chamber.
    Preferably the pressing means is a spring means and the mechanical force is spring force. In this way, a robust and non-bulky solution is achieved. The invention also relates to a fuel system for an internal combustion engine, which system comprises the high-pressure fuel pump as above. A fuel system provides fuel from one or more fuel tanks to the combustion engine and includes a low pressure circuit that supplies fuel with a applied pressure to the high pressure circuit. The high pressure circuit then feeds the fuel to the internal combustion engine by means of one or more injectors. Industry systems of this type and parts thereof are known in the art and are not described in more detail in this application.
    By providing a pressing means arranged to act on the piston, preferably on the first end portion, by means of a mechanical force, preferably spring force, so that the piston strives to be positioned with the second end portion closing the connection between the first chamber and the second chamber and so that the inlet valve thus being in a tight position; and by controlling the inlet valve by means of an electromagnetic unit arranged in the third chamber, which acts with a magnetic force on the piston of the inlet valve, the piston moving, a method is provided for controlling a high-pressure fuel pump which minimizes the risk of operational disturbances. The process is suitably carried out in a fuel system of an internal combustion engine.
    According to one aspect of the present invention, the inlet valve is controlled by controlling the supply of electric current through the electromagnetic unit.
    According to one aspect of the present invention, the electromagnetic unit is arranged so that the magnetic force acts on the piston in a direction opposite to the mechanical force.
    According to one aspect of the present invention, the electromagnetic unit is arranged so that the magnetic force acts on the piston in the same direction as the mechanical force.
    According to one aspect of the present invention, a tip low shaft inlet valve is provided, in the event that the electromagnetic unit is out of order, by ensuring that the flow force is greater than the mechanical force. In cases where the magnetic force is intended to act on the piston in a direction opposite to the mechanical force, and the electromagnetic unit is out of action, a tip low has the inlet valve achieved by increasing the feed pressure on the fuel from the pressure circuit and thus increasing the flow force acting on the piston. In this way it is ensured that the flow force is greater than the mechanical force. In cases where the magnetic force is intended to act on the piston in the same direction as the mechanical force, and the electromagnetic unit is out of action, a tip low has the inlet valve provided by ensuring that the pressing means, such as a spring means, exhibits a mechanical force, such as spring force, which is less than a tidal force caused by a normal feed pressure.
    Further advantages of the invention will become apparent from the following detailed description of the exemplary embodiments of the invention.
    BRIEF DESCRIPTION OF THE DRAWINGS In the following, as an example, preferred embodiments of the invention are described with reference to the accompanying drawings, in which: Fig. 1 shows a schematic side view of a vehicle comprising an internal combustion engine fuel system according to the present invention; Fig. 2 shows a schematic cross-sectional view of a high pressure fuel pump according to an aspect of the present invention, Fig. 3 shows a schematic cross-sectional view of a high pressure fuel pump according to an aspect of the present invention, Fig. 4 shows a schematic cross-sectional view of a high pressure fuel pump according to an aspect of the present invention. schematically an industry system; and Fig. 6 shows a flow chart of a method of a high pressure fuel pump according to the present invention. DETAILED DESCRIPTION OF EMBODIMENTS OF THE INVENTION Fig. 1 shows a schematic side view of a vehicle 1, which vehicle comprises a fuel system 4 for an internal combustion engine 2. The internal combustion engine 2 is provided with a high pressure fuel pump 12 according to the present invention.
    The internal combustion engine 2 is connected to a gearbox 6, which is connected to the drive wheel 8 of the vehicle 1 via a transmission. The vehicle also includes a chassis 10.
    Fig. 2 shows a schematic cross-sectional view of a high pressure fuel pump 12 according to an aspect of the present invention. The high pressure fuel pump 12 comprises an inlet duct 14 in connection with a first chamber 16 and through which fuel (symbolized by enlarged arrows) from a low pressure circuit 110 (see Fig. 5) of a fuel system 4 is led to the first chamber 16, a second chamber 18 arranged in in connection with the first chamber 16, an inlet valve 20 arranged in connection with the second chamber 18 for causing fuel to flow from the first chamber 16 to the second chamber 18, and an outlet valve 40 arranged in connection with the second chamber 18 for discharging fuel inlet to the internal combustion engine 2. The inlet valve 20 comprises a piston 22 with a first duck portion 24 and a second duck portion 26, the piston 22 being movably arranged with the first duck portion 24 in a third chamber 28 and the second duck portion 26 being movable 12 between the first the chamber 16 and the second chamber 18. When the inlet valve 20 is in a rod-shaped position, the second duct portion 26 connects the connection between the n the first chamber 16 and the second chamber 18 and when the inlet valve 20 is in a tipped position (illustrated by broken lines), fuel Hada can flow from the first chamber 16 to the second chamber 18 through an inlet passage 30. The second duct portion 26 is suitably designed as a truncated cone with a batten 32 having an area at least corresponding to the cross-sectional area of the first chamber 16 at the connection with the second chamber 18. When the inlet valve 20 is in the closed layer, the bottom 32 of the second duct portion 26 is thus arranged between the first chamber 16 and the the second chamber 18. When the inlet valve 20 is in a tipped position, the second end portion 26 of the piston 22 has been moved into the second chamber 28, whereby the inlet passage 30 arises.
    A spring member 34 is arranged to act on the first end portion 24 of the piston 22 by means of a spring force Fs, so that the piston 22 strives to be positioned with the second end portion 26 closing the connection between the first chamber 16 and the second chamber 18 and so that the inlet valve 20 thus being in a tight position. The forces are symbolized with the help of arrows in the drawings.
    The spring member 34 is arranged in the third chamber 28 and acts on the first duct portion 24 having the piston 22. The first duck portion 24 is suitably shaped. The spring force Fs is determined based on the performance of the pump and the dimensions of the piston. Fuel is fed to the feed pressure circuit 110 in the inlet duct 14 with a feed pressure P, which means that the industry acts on the piston 22 with a tidal force Ff in a direction opposite to the spring force F. The feed pressure P and the tidal force Ff are also determined by the pump performance and piston dimensions. The flow force Ff acting on the piston 22 depends on the feed pressure P and the area has the angled sides 36 of the second duct portion 26, on which area the feed pressure P acts. In general, the larger the area, the greater the tidal force Ff. The inlet valve 20 is actively controllable in that an electromagnetic unit 38 is arranged in the third chamber 28, in order to act with a magnetic force Fm on the first end portion 24 of the piston 22, so that the piston 22 moves. The electromagnetic unit 38 is arranged so that the magnetic force Fm acts on the first end portion 24 of the piston 22 in a direction opposite to the spring force E.
    The magnetic force Fm is provided by conducting electric current I through the electromagnetic unit 38. In order to produce a tip low has the inlet valve 20, the sum of the magnetic force Fm and the river force Ff must exceed the spring force F. The spring force Fs, the flood force Ff and the magnetic force Fm are illustrated in direction which respective force acts on the piston 22. By controlling the supply of electric current I through the electromagnetic unit 38, the magnetic force Fm can be controlled and the inlet valve 20 can thus be actively controlled to a tipped bearing whereby fuel can be supplied to the second chamber 18. To provide a When the inlet valve 20 is closed, the supply of electric current I is stopped by the electromagnetic unit 38 and the magnetic force Fm is thereby nailed. The spring force Fs is greater than the tidal force F1 and the piston 22 is thus moved to a rod bearing. Should the electromagnetic unit 38 not work, the magnetic force Fm becomes nail and in order to achieve a tip bearing the inlet valve 20 then has the flow force Ff Exceed the spring force F. This can be achieved by increasing the feed pressure P on the branch Iran pressure pressure circuit and thereby increasing the flow force Ff 22. In this way redundancy is obtained and it is a matter of fact that the internal combustion engine 2 is supplied with fuel even in cases where the active control of the inlet valve 20 does not work.
    The high pressure fuel pump 12 further comprises a pressure means 42 movably arranged in the second chamber 18. The pressure means 42 is arranged in connection with a camshaft 44 having the internal combustion engine 2 and when the camshaft 44 rotates the pressure means 42 in the second chamber 18 is moved towards and away from the first chamber 16 As the pressure means 42 is moved in the direction of the first chamber 16, the inlet valve 20 is directed to a closed bearing, the volume of the second chamber 18 is reduced and the pressure of the fuel in the second chamber 18 increases. The increased pressure of the fuel in the second chamber 18 acts on the outlet valve 40, so that it is opened and the fuel can be fed to the internal combustion engine 2. The outlet valve 40 is suitably formed by a non-return valve comprising a spring-loaded ball 46. When the pressure means 42 is moved towards Iran the first chamber 16 increases the volume of the second chamber 18 and the inlet valve 20 is controlled to a tipped layer so that fuel can flow from Iran the first chamber 16 to the second chamber 18.
    Fig. 3 shows a schematic cross-sectional view of a high pressure fuel pump 12 according to an aspect of the present invention. The high pressure fuel pump 12 is designed as described in Fig. 2 with the difference that the electromagnetic unit 38 is arranged so that the magnetic force Fm acts on the first end portion 24 of the piston 22 in the same direction as the spring force F, and thus the piston 22 moves to a rod bearing. The spring force F ,, the feed pressure P with which the fuel is fed and the tidal force Ff are determined on the basis of the pump's performance and dimensions. In order to provide a tip low, the inlet valve 20 is controlled by the supply of current I through the electromagnetic unit 38, so that the magnetic force Fm becomes nail. Since the flow force Ff is greater than the spring force F, a tip bearing shaft inlet valve 20 is thereby provided. To provide a closed bearing shaft inlet valve 20, the supply of electric current I through the electromagnetic unit 38 is controlled so that the sum of the magnetic force Fm and the spring force F, exceeds the tidal force Ff and the piston 22 thereby move to the closed team. Should the electromagnetic unit 38 not function, the magnetic force becomes Fm nail and thus the open layer is not affected by the inlet valve 20. It is ensured that the internal combustion engine 2 is supplied to the fuel even in cases where the active control of the inlet valve 20 does not work.
    Fig. 4 shows a schematic cross-sectional view of a high pressure fuel pump 12 according to an aspect of the present invention. The high pressure fuel pump 12 is designed as described in Fig. 3 with the addition that a passage 48 is provided between the inlet duct 14 and the third chamber 28. In this way, fuel can flood the Iran inlet duct 14 to the third chamber 28 and act on the first duct portion 24. On in this way the area of the piston 22, on which the industry operates, becomes larger than when the passage 48 to the third chamber 28 is missing. As the fuel operates in a dirtier area, the total flow force Ff acting on the piston 22 becomes larger, whereby a tipped layer has the inlet valve 20 in a simpler manner.
    Fig. 5 schematically illustrates a fuel system 4 comprising a low pressure circuit 110 from which the fuel is fed to a high pressure pump 12 as above. The high-pressure pump is part of the high-pressure circuit 120 of the fuel system 4, Iran, which fuel is fed to the high-pressure internal combustion engine 2.
    Fig. 6 shows a flow chart of a method of a high pressure fuel pump 12 in a fuel system 4 for an internal combustion engine 2, comprising an inlet duct 14 in connection with a first chamber 16 and through which fuel from a low pressure circuit has the fuel system 4 led to the first chamber 16, a second chamber 18 arranged in connection with the first chamber 16, an outlet valve 40 arranged in connection with the second chamber 18 and an inlet valve 20 comprising a piston 22 with a first duck portion 24 and a second duck portion 26, the piston 22 being movably arranged with the first duck portion 24 of a third chamber 28 and the second duck portion 26 are movable between the first chamber 16 and the second chamber 18. The method comprises the steps a) of providing a spring member 34 arranged to act on the first duck portion 24 by means of a spring force Fs, so that the piston 22 strives to be positioned with the second end portion 26 closing the connection between the first cam the shaft 16 and the second chamber 18 and so that the inlet valve 20 is thereby in a closed position; and b) controlling the inlet valve 20 by means of an electromagnetic unit 38 arranged in the third chamber 28, which with a magnetic force Fm can act on the piston 22 of the inlet valve 20, the piston 22 moving. Preferably, a feed pressure P, with which fuel is fed to the first chamber 16, carries a flood force Ff, which acts on the piston 22 in a direction opposite to the spring force F. The inlet valve 20 is suitably controlled by controlling the supply of electric current I through the electromagnetic unit 38. .
    According to one aspect of the present invention, the electromagnetic unit 38 is arranged so that the magnetic force Fm acts on the piston 22 in a direction opposite to the spring force F. By controlling the supply of electric current I through the electromagnetic unit 38 so that a magnetic force Fm is obtained, a tip bearing of the inlet valve 20 is provided. A rod low has the inlet valve 20 can be provided by stopping the supply of electric current I through the electromagnetic unit 38, so that the magnetic force Fm becomes negligible and does not act on the piston 22. The spring force Fs is then greater than the flood force Ff whereby the piston 22 is moved to the rod made.
    According to one aspect of the present invention, the electromagnetic unit 38 is arranged so that the magnetic force Fm acts on the piston 22 in the same direction as the spring force F. By controlling the supply of electric current I through the electromagnetic unit 38 so that a magnetic force Fm is obtained, a rod the low inlet valve 20 is provided. A tip low has the inlet valve 20 can be provided by stopping the supply of electric current I through the electromagnetic unit 38, so that the magnetic force Fm becomes negligible and does not act on the piston 22. The spring means 34 is designed so that the flood force Ff is greater than the spring force Fs, the piston 22 is moved to a tipped bearing by the tidal force F.
    Preferably, a tip low has the inlet valve 20 provided, in the case that the electromagnetic unit 38 is out of order, by ensuring that the flood force Ff is greater than the spring force F. In the case that the electromagnetic unit 38 is arranged to operate with the magnetic force Fm in 17 in a direction opposite to the spring force F1, it is ensured that the flood force Ff is greater than the spring force F, suitably by increasing the feed pressure P with which the fuel is fed. In the case that the electromagnetic unit 38 is arranged to act with the magnetic force Fm in the same direction as the spring force F1, it is ensured that the flow force Ff is greater than the spring force F, by providing a spring member 34 having a spring force F, which is lower than the flood force. Ff.
    The stated components and features mentioned above can be combined within the scope of the invention between different specified embodiments. 18
    权利要求:
    Claims (22)
    [1]
    A high pressure fuel pump (12) comprises a fuel system (4), comprising an inlet duct (14) in connection with a first chamber (16) and through which fuel is led to the first chamber (16) with a feed pressure (P), a second chamber (18) arranged in connection with the first chamber (16), an outlet valve (40) arranged in connection with the second chamber (18) and an inlet valve (20) comprising a piston (22) with a first duct portion (24) and a second duck portion (26), the piston (22) being movably arranged with the first duck portion (24) in a third chamber (28) and the second duck portion (26) being movably arranged between the first chamber (16) and the second chamber ( 18), characterized in that a pressing member (34) is arranged to act on the piston (22) by means of a mechanical force (Fe), so that the piston (22) strives to be positioned with the second end portion (26) closing the connection between the first the chamber (16) and the second chamber (18) and said that the inlet valve (20) is thereby located in a closed position, the inlet valve (20) being controllable in that a controllable electromagnetic unit (38) is arranged in the third chamber (28), in order to act with a magnetic force (Fm) on the piston (22), so that the piston (22) moves.
    [2]
    A high pressure fuel pump according to claim 1, wherein the pressing means (34) is arranged to act on the first duct portion (24) having the piston (22).
    [3]
    High pressure fuel pump according to claim 1 or 2, wherein the magnetic force (Fm) is arranged to act on the first end portion (24) of the piston (22).
    [4]
    High pressure fuel pump according to any one of the preceding claims, wherein the feed pressure (P), with which fuel is fed to the first chamber (16), carries a flow force (Ft), which acts on the piston (22) in a direction opposite to the mechanical force (Fs ). 19
    [5]
    A high-pressure fuel pump according to any one of the preceding claims, wherein the magnetic force (Fm) is provided by conducting electric current (I) through the electromagnetic unit (38).
    [6]
    A high pressure fuel pump according to any one of the preceding claims, wherein the electromagnetic unit (38) is arranged to act with the magnetic force (Fm) on the piston (22) in a direction opposite to the spring force (Fe), to provide a tip bearing shaft inlet valve (20) .
    [7]
    The high pressure fuel pump according to claims 1-5, wherein the electromagnetic unit (38) is arranged to act with the magnetic force (Fm) on the piston (22) in the same direction as the spring force (Fe), to provide a closed bearing shaft inlet valve (20) .
    [8]
    High pressure fuel pump according to claim 7, wherein a passage (48) is arranged between the inlet duct (14) and the third chamber (28), so that fuel fed through the inlet duct (14) can flocculate to the third chamber (28).
    [9]
    A high pressure fuel pump according to any one of the preceding claims, wherein the outlet valve (40) is provided by a non-return valve.
    [10]
    A high pressure fuel pump according to any one of the preceding claims, wherein a pressure means (42) is movably arranged in the second chamber (18) in connection with a camshaft (44) having an internal combustion engine (2).
    [11]
    The high-pressure fuel pump according to claim 10, wherein the pressure means (42) is arranged to increase the pressure of the fuel in the second chamber (18) and thereby enable discharge of the fuel through the outlet valve (40).
    [12]
    A high pressure fuel pump according to any one of the preceding claims, wherein the pressing means (34) is a spring means (34) and the mechanical force is spring force.
    [13]
    Fuel system (4) for an internal combustion engine (2), characterized by a high-pressure fuel pump (12) according to any one of claims 1-12.
    [14]
    Internal combustion engine can be characterized by a high pressure fuel pump (12) according to any one of claims 1-12 and / or a fuel system according to claim 13.
    [15]
    Vehicle characterized by a high-pressure fuel pump (12) according to any one of claims 1-12 and / or a fuel system according to claim 13.
    [16]
    A method of controlling a high pressure fuel pump (12), comprising an inlet duct (14) in communication with a first chamber (16) and through which fuel is directed to the first chamber (16) with a feed pressure (P), a second chamber ( 18) arranged in connection with the first chamber (16), an outlet valve (40) arranged in connection with the second chamber (18) and an inlet valve (20) comprising a piston (22) with a first duct portion (24) and a second duck portion (26), the piston (22) being movably arranged with the first duck portion (24) in a third chamber (28) and the second duck portion (26) being movable between the first chamber (16) and the second chamber (18) , characterized by the steps of: 1. providing a pressing means (34) arranged to act on the piston (22) by means of a mechanical force (F 1), so that the piston (22) strives to be positioned with the connection of the second duct portion (26) between the first chamber (16) and the second chamber (18) and said that the inlet valve (20) thus being in a tight position; and 2. controlling the inlet valve (20) by means of an electromagnetic unit (38) arranged in the third chamber (28), which acts with a magnetic force (Fm) on the piston (22) of the inlet valve (20), the piston (22) moving. 21
    [17]
    A method according to claim 16, wherein a feed pressure (P), with which fuel is fed to the first chamber (16), mediates a tidal force (Ff), which acts on the piston (22) in a direction opposite to the mechanical force (Fe) .
    [18]
    A method according to claim 16 or 17, wherein the inlet valve (20) is controlled by controlling the supply of electric current (I) through the electromagnetic unit (38).
    [19]
    A method according to any one of claims 16-18, wherein the electromagnetic unit (38) is arranged such that the magnetic force (Fm) acts on the piston (22) in a direction opposite to the mechanical force (Fe).
    [20]
    A method according to any one of claims 16-18, wherein the electromagnetic unit (38) is arranged such that the magnetic force (Fm) acts on the piston (22) in the same direction as the mechanical force (Fs).
    [21]
    A method according to claims 16-20, wherein, in cases where the electromagnetic unit (38) is out of operation, a tip low has the inlet valve (20) is provided by ensuring that the flow force (Ff) is greater than the mechanical force (Fs) .
    [22]
    A method according to any one of claims 16-22, wherein the mechanical force (Fe) is spring force provided by hand via a spring means (34). 24 2 /
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    同族专利:
    公开号 | 公开日
    DE112015003700T5|2017-05-11|
    US20170226977A1|2017-08-10|
    WO2016043642A1|2016-03-24|
    SE539663C2|2017-10-24|
    US10815947B2|2020-10-27|
    BR112017001727A2|2018-02-14|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    JP4305459B2|2006-02-27|2009-07-29|トヨタ自動車株式会社|Fuel supply device for internal combustion engine|
    EP2317105B1|2009-10-28|2012-07-11|Hitachi Ltd.|High-pressure fuel supply pump and fuel supply system|
    JP5387538B2|2010-10-18|2014-01-15|株式会社デンソー|Fail safe control device for in-cylinder internal combustion engine|
    EP2535553B1|2011-06-15|2014-04-16|Delphi International Operations Luxembourg S.à r.l.|Inlet Valve Arrangement for a Fuel Pump|
    DE102012207744A1|2012-05-09|2013-11-14|Robert Bosch Gmbh|Method for operating fuel system of internal combustion engine mounted in e.g. motor vehicle, involves pulsing electrically driven fuel pump, periodically, in manner of pulse width modulation, by a relay and connecting to power supply|
    CN106795846B|2014-08-28|2019-05-03|日立汽车系统株式会社|High-pressure fuel feed pump|SE541444C2|2016-07-18|2019-10-01|Scania Cv Ab|Fuel system comprising a high pressure pump adapted to pump fuel in case of failure of other fuel pumps|
    IT201700073083A1|2017-06-29|2018-12-29|Bosch Gmbh Robert|PUMP UNIT FOR FUEL SUPPLY TO AN INTERNAL COMBUSTION ENGINE|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1451061A|SE539663C2|2014-09-15|2014-09-15|High-pressure fuel pump for a fuel system and method for controlling a fuel system comprising such a pump|SE1451061A| SE539663C2|2014-09-15|2014-09-15|High-pressure fuel pump for a fuel system and method for controlling a fuel system comprising such a pump|
    BR112017001727A| BR112017001727A2|2014-09-15|2015-08-27|high pressure fuel pump for a fuel system|
    US15/500,810| US10815947B2|2014-09-15|2015-08-27|High pressure fuel pump for a fuel system|
    DE112015003700.4T| DE112015003700T5|2014-09-15|2015-08-27|High pressure fuel pump for a fuel system|
    PCT/SE2015/050905| WO2016043642A1|2014-09-15|2015-08-27|High pressure fuel pump for a fuel system|
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