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
  • F02D41/20—Output circuits, e.g. for controlling currents in command coils
• • 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
  • F02D2041/2003—Output circuits, e.g. for controlling currents in command coils using means for creating a boost voltage, i.e. generation or use of a voltage higher than the battery voltage, e.g. to speed up injector opening
• • 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
  • F02D2041/2003—Output circuits, e.g. for controlling currents in command coils using means for creating a boost voltage, i.e. generation or use of a voltage higher than the battery voltage, e.g. to speed up injector opening
  • F02D2041/2006—Output circuits, e.g. for controlling currents in command coils using means for creating a boost voltage, i.e. generation or use of a voltage higher than the battery voltage, e.g. to speed up injector opening by using a boost capacitor
• • 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
  • F02D2041/2037—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit for preventing bouncing of the valve needle
• • 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
  • F02D2041/2041—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit for controlling the current in the free-wheeling phase
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F7/00—Magnets
  • H01F7/06—Electromagnets; Actuators including electromagnets
  • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
  • H01F7/18—Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings
  • H01F2007/1894—Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings minimizing impact energy on closure of magnetic circuit

Definitions

• the invention relates to a circuit for operating a solenoid valve and a method for operating a circuit for a solenoid valve.
• a solenoid valve in such an injector has the task of controlling the opening movement of the nozzle needle by controlling the pressure conditions in a control space arranged above the nozzle needle.
• a method for controlling an electromagnetic valve is known from the publication DE 10 2007 003 21 1 A1.
• a valve needle of an electromagnetic valve without current takes a first position and energizes a second position.
• the transition from the second position to the first position of the valve needle takes place from a predetermined time for a certain period of time a Nachbestromung.
• the invention relates to a circuit for operating a solenoid valve which has at least one component which is designed, during a closing operation of the solenoid valve, at least following the closing time of the solenoid valve, a decreasing time course of the difference between an oriented in the opening direction of the solenoid valve force and a In the closing direction of the solenoid valve oriented force to produce.
• the invention further relates to a method for operating a circuit for a solenoid valve, wherein at least following the closing time of the solenoid valve, a decreasing time course of the difference between a oriented in the opening direction of the solenoid valve and a oriented in the closing direction of the solenoid valve at a closing operation of the solenoid valve Force is generated.
• the solenoid valve is formed as part of an injector and to be opened and closed with a valve element, wherein the valve element is pressed by a closing direction oriented force, which is provided by at least one closing element in a valve seat, and wherein the Valve element is opened by a provided by a magnetic coil force, which counteracts the force of the at least one closing element and is oriented in the opening direction, is opened.
• a passive bounce attenuation can be provided by a network or a series connection with a resistor and a diode.
• the described circuit is designed to perform all the steps of the presented method.
• individual steps of this method can also be performed by individual components of the circuit.
• functions of the circuit or functions of individual components of the circuit may be implemented as steps of the method.
• steps of the method are realized as functions of individual components of the circuit or the entire circuit.
• Figure 1 shows a schematic representation of a detail of an embodiment of a solenoid valve.
• FIG. 2 shows a diagram with operating parameters that result in the prior art during a rebound operation of a solenoid valve.
• FIG. 3 shows a schematic representation of a first embodiment of a circuit according to the invention.
• FIG. 4 shows a schematic representation of a second embodiment of a circuit according to the invention.
• FIG. 5 shows a first and a second diagram with operating parameters which result in a rebounding process of a solenoid valve in a first and a second embodiment of the method according to the invention.
• FIG. 1 The detail of a solenoid valve 2 shown diagrammatically in FIG. 1 comprises a magnet coil 4 with a core 6 and a valve element 8.
• the solenoid valve 2 furthermore comprises a closure element 10 designed as a closing spring and a sealing seat 12 or valve seat which is merely indicated.
• a concrete embodiment of the sealing seat 12 is usually not important for the realization of the embodiments of the invention described with reference to FIGS. 3 to 6.
• the solenoid valve 2 is, depending on a position of the valve element 8, relative to the sealing seat 12 either open or closed.
• a force 14 or closing force oriented in the closing direction is provided by the closing element 10, with which the valve element 8 is pressed or pressed into the sealing seat 12 so that the sealing seat 12 is closed.
• the magnetic coil 4 is energized.
• an opening-oriented force 16 or magnetic force is provided which counteracts the force 14 oriented in the closing direction. It follows that the solenoid valve 2 is opened. At one end of the energization, the magnetic force is reduced again and the valve element 8 by its closing force, usually the force 14 of the biased closing element, moved back into the sealing seat 12 and then closed.
• the valve element 8 usually has a magnetic armature.
• the valve element 8 may be made in one piece with the armature, but also consist of several, assembled components and thus form an assembly.
• the valve element 8 is usually surrounded within the solenoid valve 2 by fuel, which is under low pressure.
• valve element has a not inconsiderable kinetic energy when it reaches the sealing seat. Since it is typically both the sealing seat and the valve element to metallic and thus elastic components, this energy is converted after the impact of the valve member in the sealing seat at a seat contact 32 in elastic deformation energy. When this is done completely, the two components are deformed back again. The elastic deformation energy is converted back into kinetic energy.
• the valve element leaves the sealing seat again at a first bounce 34, and at approximately the same speed with which the sealing seat has been reached shortly before.
• the diagram of Figure 2 thus shows a typical vomprellvorgang according to the prior art.
• the diagram of Figure 2 also shows that the magnetic force is substantially degraded before the valve element reaches the sealing seat for the first time.
• This process is repeated several times until the kinetic energy has been completely removed by low damping effects from a device or a system having the components described with reference to Figure 1.
• the described process is referred to as bouncing 34. Since the sealing seat is opened each time the valve element is lifted off the sealing seat, this bouncing 34 has a considerable influence on the amount of fuel ultimately injected by the injector.
• the components of the solenoid valve are made of metal and also made high demands on the wear resistance of the valve seat, a bounce due to plastic deformation upon arrival of the valve element in the valve seat or sealing seat is not suitable.
• a certain bounce damping can be achieved if a hydraulic closing force builds up during the seat contact due to favorable flow conditions in the surrounding fuel, which presses the valve element when re-lifting stronger in the direction of sealing seat, as is the case when driving. Such conditions are difficult to realize and also highly dependent on the state of the surrounding medium.
• the bouncing 34 can be reduced if an additional force is built up in the closing direction during the seat contact 32 - ie in the time interval between reaching and leaving the sealing seat again. The same effect can be achieved if, during the seat contact, an initially existing force in the opening direction is reduced.
• a reduction of the magnetic force is slowed down such that upon reaching the sealing seat, a significant magnetic force is still present and that this magnetic force has a significant negative gradient during a time interval of the seat contact.
• FIG. 40 A first embodiment of a circuit 40 according to the invention is shown schematically in FIG.
• the circuit 40 comprises a magnetic coil 42 of a
• Solenoid valve to which a coil voltage 44 U S uie is applied. Parallel to the solenoid 42, a damping resistor 46 Rüäm f is connected. The solenoid 42 and the damping resistor 46 R üäm p f A current I 47 is supplied.
• the circuit 40 from FIG. 3 further comprises a freewheeling diode 48, a booster diode 50, a semiconductor valve which can be switched on and off as a high-side switch 52, a semiconductor valve which can be switched on and off as a low-side switch 54, and a booster switch 56 trained switched on and off semiconductor valve.
• the aforementioned switched on and off semiconductor valves are usually designed as field effect transistors (FET), bipolar transistors with insulated gate electronics (IGBT, insulated gate biopolar transistor) or similar electronic components.
• the circuit 40 comprises a booster capacitor 58 C Bo east, which is designed to provide a booster voltage 60 Ußoost, and a DC-DC or DC converter 62.
• the circuit 40 is also connected to a battery, not shown - concluded that is adapted to provide the components of the circuit 40 has a battery voltage 62 U Ba tt.
• FIG. 70 A second embodiment of a circuit 70 according to the invention is shown schematically in FIG.
• This circuit 70 comprises all components, such as the first embodiment of the circuit 40 according to the invention, which has already been described with reference to FIG.
• the second embodiment of the circuit 70 has a diode 72 connected in series with the damping resistor 46 and thus also in parallel with the solenoid coil 42.
• the desired course of the magnetic force is realized by connecting the damping resistor 46 in parallel to the magnet coil 42. This ensures that the coil current is not completely dissipated at the end of the activation, but rather that in the magnetic coil 42 and damping resistor 46 formed mesh continues to flow and slowly degrades against the voltage drop across the damping resistor 46. As a result, a slower degradation of the magnetic force is achieved.
• the damping resistor 46 can be integrated in an output stage, but can also be arranged in an embodiment of the invention on the solenoid valve and there again particularly advantageous in a plug element of the solenoid valve.
• the damping resistor 46 can be arranged between the contact lugs of the plug and subsequently encapsulated.
• the damping resistor 46 may also be provided by using a conductive plastic as the overmolding material or as the plastic material of the plug element, as is possible as a replacement for a discrete leakage resistance in the piezo injector.
• a conductive plastic as the overmolding material or as the plastic material of the plug element
• the diode 72 restricts the action of the damping resistor 46 to the turn-off phase of a magnetic circuit comprising the solenoid coil 42.
• the damping resistor 46 also slows down the build-up of the magnetic force at the beginning of the control.
• it can be avoided by the diode 72 that during the build-up of the magnetic force for a NEN flow of current through the damping resistor 46 additional energy must be removed from the booster capacitor 58 or from the battery.
• the damping resistor 46 has no function as long as the voltage applied to the magnetic coil 42 is greater than a limiting voltage of, for example, -0.8
• V is, this typically applies to the entire drive time. Only when switching off the magnetic field, the damping resistance unfolds its desired effect.
• FIG. 5 a shows a diagram with operating parameters of a solenoid valve, which result in a bouncing process of the solenoid valve in a first embodiment of the method according to the invention.
• a vertically oriented axis 22 is applied over a horizontally oriented time axis 30.
• the diagram shows a profile of a magnetic force 80, a profile of a valve lift 82 of a valve element of the solenoid valve and thus a distance of the valve element from the valve seat of the solenoid valve.
• the diagram shows a profile for a speed 84 of the valve element and time intervals for suggesting a seat contact 86 and a first bounce 88 at a first value for a damping resistor.
• FIG. 5b Another diagram with a course of a magnetic force 90, a profile of a valve lift 92 and a profile of a valve speed 94 and with time intervals for a seat contact 96 and a first bouncing 98 is shown in FIG. 5b.
• the said operating parameters are influenced by a second value of a damping resistor connected in parallel with the magnetic coil.
• FIGS. 5a and 5b The courses of magnetic force 80, 90, valve lift 82, 92 and valve speed 84, 94 shown in FIGS. 5a and 5b result at two different values of the damping resistance and otherwise unchanged conditions with respect to FIG. 2. It can be clearly seen that FIGS Magnetic force 80, 90 is subjected to significant degradation during the seat contact 86, 96, whereby the rebound speed is lowered compared to the impact speed. Overall, the kinetic energy of the valve element at the beginning of the first bounce 88, 98 drops by the damping resistance by up to 64%. The lower bounce time and bounce height over the prior art (Figure 2) are clearly visible.
• the impact speed is already lower than the prior art and that, on leaving the sealing seat, the speed is also about 5% lower than the impact speed. While this initially appears low, it means a 10% reduction in the kinetic energy of the valve member during seat contact, and, together with the damping effect of the hydraulic surrounding the valve member, can reduce bounce altogether to the extent that the detrimental effects of the bounce on the metering accuracy completely and robustly avoided.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Magnetically Actuated Valves (AREA)
• Fuel-Injection Apparatus (AREA)
• Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Applications Claiming Priority (2)

Publications (1)

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ID=42829558

Family Applications (1)

Country Status (5)

Families Citing this family (2)

Family Cites Families (18)

• 2009
  • 2009-10-12 DE DE200910045581 patent/DE102009045581A1/de not_active Withdrawn
• 2010
  • 2010-08-16 CN CN201080045774.6A patent/CN102575605B/zh not_active Expired - Fee Related
  • 2010-08-16 WO PCT/EP2010/061886 patent/WO2011045104A1/de active Application Filing
  • 2010-08-16 JP JP2012532508A patent/JP2013507582A/ja active Pending
  • 2010-08-16 EP EP10743129A patent/EP2488741A1/de not_active Withdrawn

Non-Patent Citations (1)

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