EP0629264B1 - Reciprocating piston pump - Google Patents

Reciprocating piston pump Download PDF

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Publication number
EP0629264B1
EP0629264B1 EP93905298A EP93905298A EP0629264B1 EP 0629264 B1 EP0629264 B1 EP 0629264B1 EP 93905298 A EP93905298 A EP 93905298A EP 93905298 A EP93905298 A EP 93905298A EP 0629264 B1 EP0629264 B1 EP 0629264B1
Authority
EP
European Patent Office
Prior art keywords
fuel
current
transistor
comparator
coil
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP93905298A
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German (de)
French (fr)
Other versions
EP0629264A1 (en
Inventor
Wolfgang Heimberg
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ficht GmbH and Co KG
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Ficht GmbH and Co KG
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Filing date
Publication date
Priority claimed from DE4206817A external-priority patent/DE4206817C2/en
Application filed by Ficht GmbH and Co KG filed Critical Ficht GmbH and Co KG
Publication of EP0629264A1 publication Critical patent/EP0629264A1/en
Application granted granted Critical
Publication of EP0629264B1 publication Critical patent/EP0629264B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/46—Details, component parts or accessories not provided for in, or of interest apart from, the apparatus covered by groups F02M69/02 - F02M69/44
    • F02M69/462—Arrangement of fuel conduits, e.g. with valves for maintaining pressure in the pipes after the engine being shut-down
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/02—Pressure lubrication using lubricating pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D33/00—Controlling delivery of fuel or combustion-air, not otherwise provided for
    • F02D33/003—Controlling the feeding of liquid fuel from storage containers to carburettors or fuel-injection apparatus ; Failure or leakage prevention; Diagnosis or detection of failure; Arrangement of sensors in the fuel system; Electric wiring; Electrostatic discharge
    • F02D33/006—Controlling the feeding of liquid fuel from storage containers to carburettors or fuel-injection apparatus ; Failure or leakage prevention; Diagnosis or detection of failure; Arrangement of sensors in the fuel system; Electric wiring; Electrostatic discharge depending on engine operating conditions, e.g. start, stop or ambient conditions
    • 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
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0047—Layout or arrangement of systems for feeding fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/04—Feeding by means of driven pumps
    • F02M37/08—Feeding by means of driven pumps electrically driven
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M39/00—Arrangements of fuel-injection apparatus with respect to engines; Pump drives adapted to such arrangements
    • F02M39/005—Arrangements of fuel feed-pumps with respect to fuel injection apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/04—Pumps peculiar thereto
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/007—Venting means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F02M57/02—Injectors structurally combined with fuel-injection pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F02M57/02—Injectors structurally combined with fuel-injection pumps
    • F02M57/022—Injectors structurally combined with fuel-injection pumps characterised by the pump drive
    • F02M57/027—Injectors structurally combined with fuel-injection pumps characterised by the pump drive electric
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/38—Pumps characterised by adaptations to special uses or conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/047—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series the valves being formed by deformable nozzle parts, e.g. flexible plates or discs with fuel discharge orifices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/08—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series the valves opening in direction of fuel flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/06—Use of pressure wave generated by fuel inertia to open injection valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/16—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel characterised by means for metering continuous fuel flow to injectors or means for varying fuel pressure upstream of continuously or intermittently operated injectors
    • F02M69/18—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel characterised by means for metering continuous fuel flow to injectors or means for varying fuel pressure upstream of continuously or intermittently operated injectors the means being metering valves throttling fuel passages to injectors or by-pass valves throttling overflow passages, the metering valves being actuated by a device responsive to the engine working parameters, e.g. engine load, speed, temperature or quantity of air
    • F02M69/24—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel characterised by means for metering continuous fuel flow to injectors or means for varying fuel pressure upstream of continuously or intermittently operated injectors the means being metering valves throttling fuel passages to injectors or by-pass valves throttling overflow passages, the metering valves being actuated by a device responsive to the engine working parameters, e.g. engine load, speed, temperature or quantity of air the device comprising a member for transmitting the movement of the air throttle valve actuated by the operator to the valves controlling fuel passages
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/30—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel characterised by means for facilitating the starting-up or idling of engines or by means for enriching fuel charge, e.g. below operational temperatures or upon high power demand of engines
    • F02M69/34—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel characterised by means for facilitating the starting-up or idling of engines or by means for enriching fuel charge, e.g. below operational temperatures or upon high power demand of engines with an auxiliary fuel circuit supplying fuel to the engine, e.g. with the fuel pump outlet being directly connected to injection nozzles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/46—Details, component parts or accessories not provided for in, or of interest apart from, the apparatus covered by groups F02M69/02 - F02M69/44
    • 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
    • F02D2041/2058—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit using information of the actual current value
    • 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
    • F02D2041/2068—Output circuits, e.g. for controlling currents in command coils characterised by the circuit design or special circuit elements
    • F02D2041/2075—Type of transistors or particular use thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/04—Feeding by means of driven pumps
    • F02M37/08—Feeding by means of driven pumps electrically driven
    • F02M2037/085—Electric circuits therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/24—Fuel-injection apparatus with sensors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/40—Fuel-injection apparatus with fuel accumulators, e.g. a fuel injector having an integrated fuel accumulator

Definitions

  • the invention relates to a reciprocating pump.
  • Such reciprocating pumps are e.g. described in DD-PS 120 514, DD-PS 213 472 or in DE-OS 23 07 435. These pumps serve as fuel injectors. It is important to precisely dose the quantities to be sprayed. It is known to dose the amount of fuel to be sprayed, for example in a time-controlled manner. A purely time-based control has proven to be disadvantageous, however, because the time window that results between the minimum and maximum amount of fuel to be sprayed is too small to differentiate the quantity spectrum required in engine operation in a differentiated and reproducible manner.
  • a circuit for controlling an injection device is known.
  • the purpose of this circuit is to keep the injector open state stable, applying a high current pulse (I MAX ) to the injector at the beginning of the injection process and applying a long current pulse with a low current value (I HOLD ) during the open state .
  • the injection valve is opened with the high current pulse (I MAX ) and held in its open position with the long current pulse (I HOLD ).
  • the two current values are each generated by a control circuit, which each control a comparator.
  • the control circuit for the initial current pulse (I MAX ) is preceded by a monostable circuit which is driven by the rising edge of the injection signal when the injection signal is applied, so that it responds to the control circuit over the short predetermined period.
  • JP-A-62 210 241 shows a circuit for controlling an injection device working with a piezo element.
  • This circuit has a transformer, on the output side of which a piezo element is connected. The coil on the input side of the transformer is grounded via a power transistor and a measuring resistor. The control input of the transistor is controlled by means of a comparator.
  • a flip-flop circuit is arranged between the transistor under the comparator. The flip-flop circuit is turned on when an injection pulse is applied to apply an output signal to the transistor. When the current across the resistor reaches a predetermined value, the flip-flop circuit is reset by the comparator and the transistor is consequently switched off. The current through the transistor is thus terminated when a predetermined current value is reached.
  • This circuit is thus provided in order to control the increase in a current profile up to a predetermined value, but not to keep the output of the transformer at a specific current value.
  • the object of the invention is to provide a reciprocating pump driven electromagnetically with an excitation coil with a circuit for controlling the excitation coil, which is used for a fuel injection device, a differentiable amount of fuel to be metered with the reciprocating pump, the reciprocating pump being largely independent of the Coil heating and fluctuations in the supply voltage works.
  • the excitation i.e. the product of the number of turns of the coil and the current strength of the current that passes through the coil, determining for the electromagnetic energy conversion.
  • an exclusive control of the current amplitude allows the switching behavior of the drive magnet to be uniquely defined regardless of the effects of coil heating and a fluctuating supply voltage. In this way, such a control system takes into account in particular the electrical voltage conditions and the different temperature conditions, which usually fluctuate strongly in motors.
  • an initial partial stroke of the delivery element of the injection pump is provided, in which the displacement of the fuel does not result in a pressure build-up, the delivery element partial stroke serving for energy storage expediently being provided by a storage volume, for example in the form of an empty volume and a Stop element is determined, which can be designed differently and which allow the displacement of fuel on a stroke "X" of the delivery element of the reciprocating pump; only when the displacement of the fuel is abruptly interrupted is an abrupt pressure build-up generated in the fuel, so that the fuel is displaced in the direction of the injection nozzle.
  • the injection device according to FIG. 1 has an electromagnetically driven reciprocating piston pump 1, which is connected to an injection nozzle device 3 via a delivery line 2.
  • a suction line 4 branches off from the delivery line 2 and is connected to a fuel reservoir 5 (tank).
  • the delivery line 2 is approximately in the area of Connection of the intake line 4, a volume storage element 6 connected via a line 7.
  • the pump 1 is designed as a piston pump and has a housing 8 in which a magnet coil 9 is mounted, an armature 10 which is arranged in the region of the coil passage and is designed as a cylindrical body, for example as a solid body, and is guided in a housing bore 11 which is located in the region the central longitudinal axis of the ring coil 9, and is pressed by means of a compression spring 12 into an initial position in which it rests on the bottom 11a of the housing bore 11.
  • the compression spring 12 is supported on the end face of the armature 10 on the injection nozzle side and an annular step 13 of the housing bore 11 opposite this end face.
  • the spring 12 includes, with play, a delivery piston 14 which is fixed to the armature 10 on the armature end face acted upon by the spring 12, e.g. in one piece, is connected.
  • the delivery piston 14 plunges relatively deep into a cylindrical fuel delivery chamber 15 which is formed coaxially in the axial extension of the housing bore 11 in the pump housing 8 and is in transmission connection with the pressure line 2. Due to the immersion depth, pressure losses during the sudden pressure increase can be avoided, and the manufacturing tolerances between piston 14 and cylinder 15 can even be relatively large, e.g. only need to be in the hundredth of a millimeter range, so that the manufacturing effort is low.
  • a check valve 16 is arranged in the intake line 4.
  • a ball 18, for example, is arranged in the housing 17 of the valve 16 as a valve element, which in its rest position is pressed by a spring 19 against its valve seat 20 at the end of the valve housing 17 on the reservoir side.
  • the spring 19 is supported on the one hand on the ball 18 and on the other hand on the wall of the housing 17 opposite the valve seat 20 in the region of the mouth 21 of the intake line 4.
  • the storage element 6 has e.g. two-part housing 22, in the cavity of which a membrane 23 is tensioned as the organ to be displaced, which separates a pressure line-side space filled with fuel from the cavity, and which divides the cavity into two halves in the relaxed state, which is sealed off from one another by the membrane are.
  • a membrane 23 On the side of the membrane 23 facing away from the line 7, an elastic force acting on it acts on an empty space, the storage volume, for example.
  • the spring 24 is supported with its end opposite the membrane on an inner wall of the cylindrically widened empty cavity.
  • the empty cavity of the housing 22 is delimited by an arched wall, which forms a stop surface 22a for the membrane 23.
  • the coil 9 of the pump 1 is connected to a control device 26 which serves as an electronic control for the injection device.
  • the armature 10 of the pump 1 is located on the base 11a due to the pretensioning of the spring 12.
  • the fuel supply valve 16 is closed and the storage membrane 23 is held in the housing cavity by the spring 24 in its position away from the stop surface 22a.
  • the armature 10 with the piston 14 is moved in the direction of the injection valve 3 against the force of the spring 12.
  • the feed piston 14 connected to the armature 10 displaces fuel from the feed cylinder 15 into the space of the storage element 6.
  • the spring forces of the springs 12, 24 are relatively soft, so that fuel displaced by the feed piston 14 during the first partial stroke of the feed piston 14 presses the storage membrane 23 into the empty space almost without resistance.
  • the armature 10 can initially be accelerated almost without resistance until the storage volume or empty space volume of the storage element 6 is exhausted by hitting the membrane 23 on the vault wall 22a.
  • the displacement of the fuel is suddenly stopped and the fuel is suddenly compressed due to the already high kinetic energy of the delivery piston 14.
  • the kinetic energy of the armature 10 with the delivery piston 14 acts on the liquid. This creates a pressure surge that travels through the pressure line 2 to the nozzle 3 and there leads to the spraying of fuel.
  • the coil 9 is switched off.
  • the armature 10 is moved back to the floor 11a by the spring 12.
  • the amount of liquid stored in the storage device 6 is sucked back via the lines 7 and 2 into the delivery cylinder 15 and the membrane 23 is pushed back into its starting position due to the action of the spring 24.
  • the fuel supply valve 16 opens, so that fuel is sucked out of the tank 5.
  • a valve 16a is expediently arranged in the pressure line 2 between the injection valve 3 and the branches 4, 7 and maintains a stand pressure in the space on the injection valve side, which e.g. is higher than the vapor pressure of the liquid at the maximum temperature, so that bubbles are prevented.
  • the parking pressure valve can e.g. be designed as the valve 16.
  • Such a fuel injection device requires activation of the excitation coil 9, which enables differentiated metering with the reciprocating pump 1.
  • FIG. 2 shows the two-point control circuit according to the invention for the current amplitude of the current controlling a pump drive coil 9, 600.
  • the drive coil 600 is connected to a power transistor 601 which is connected to ground via a measuring resistor 602.
  • a comparator 603 is connected to the control input of transistor 601, for example to the transistor base created its exit.
  • the non-inverting input of the comparator 603 is acted upon by a current setpoint, which is obtained for example by means of a microcomputer.
  • the inverting input of comparator 603 is connected to the side of the measuring resistor which is connected to transistor 601.
  • the current consumed by the coil 9, 600 is measured by the measuring resistor 602. If this current reaches the limit value specified by a microprocessor as the current setpoint, the comparator 603 switches off the current for the coil 9, 600 via the power transistor 601. As soon as the actual current value falls below the current setpoint, the transistor 601 switches the current on again via the comparator 603. The current rise delay caused by the inductance of the coil 9, 600 prevents the maximum permissible current from being exceeded too quickly.
  • next switching cycle can then begin and this clocking of the coil current of the coil 9, 600 takes place as long as the reference voltage supplying the current setpoint is present at the non-inverting input of the comparator 603.
  • the circuit according to the invention represents a clocked current source, the clocking only starting after the current setpoint provided by the microprocessor has been reached.
  • the energy and thus the quantity control of the pump device 1 can take place with this circuit in combination of the duration and / or the amount of the reference voltage provided by the microprocessor.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Electromagnetic Pumps, Or The Like (AREA)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
  • Steroid Compounds (AREA)

Abstract

The fuel injection system has a unit for producing increase in pressure which includes an impingement device (25), e.g. a rear wall or a piston type stop. The impingement device is provided in a fuel storage element (6) arranged outside an injection pump (1), connected at a pressure line (2) between the injection pump and the injection nozzle (3). The storage element (6) includes a fuel storage chamber (22), in which a spring preloaded diaphragm (23) is arranged. One side of the chamber is arranged at a specified distance to the diaphragm.

Description

Die Erfindung betrifft eine Hubkolbenpumpe.The invention relates to a reciprocating pump.

Derartige Hubkolbenpumpen werden z.B. in der DD-PS 120 514, DD-PS 213 472 oder in der DE-OS 23 07 435 beschrieben. Diese Pumpen dienen als Kraftstoff-Einspritzvorrichtungen. Dabei kommt es darauf an, die abzuspritzenden Mengen exakt zu dosieren. Bekannt ist, die Dosierung der abzuspritzenden Kraftstoffmenge beispielsweise zeitlich gesteuert vorzunehmen. Eine rein zeitliche Steuerung hat sich jedoch als nachteilig erwiesen, weil das Zeitfenster, welches sich zwischen minimal und maximal abzuspritzender Kraftstoffmenge ergibt, zu klein ist, um das im Motorbetrieb erforderliche Mengenspektrum differenziert und reproduzierbar genug zu beherrschen.Such reciprocating pumps are e.g. described in DD-PS 120 514, DD-PS 213 472 or in DE-OS 23 07 435. These pumps serve as fuel injectors. It is important to precisely dose the quantities to be sprayed. It is known to dose the amount of fuel to be sprayed, for example in a time-controlled manner. A purely time-based control has proven to be disadvantageous, however, because the time window that results between the minimum and maximum amount of fuel to be sprayed is too small to differentiate the quantity spectrum required in engine operation in a differentiated and reproducible manner.

Aus der JP-A 60 26135 ist eine Schaltung zum Steuerun einer Einspritzvorrichtung bekannt. Der Zweck dieser Schaltung ist es, den Öffnungzustand des Einspritzventils stabil zu halten, wobei zu Beginn des Einspritzvorganges ein hoher Strompuls (IMAX) an das Einspritzventil angelegt wird, und während des Öffnungszustandes ein langer Strompuls mit einem geringen Stromwert (IHOLD) angelegt wird. Mit dem hohen Strompuls (IMAX) wird das Einspritzventil geöffnet und mit dem langen Strompuls (IHOLD) in seiner offenen Stellung gehalten. Die beiden Stromwerte werden jeweils von einem Steuerschaltkreis erzeugt, die jeweils einen Komparator ansteuern. Dem Steuerschaltkreis für den Anfangsstrompuls (IMAX) ist ein monostabiler Schaltkreis vorgeschaltet, der beim Anlegen des Einspritzsignals von der ansteigenden Flanke des Einspritzsignals angesteuert wird, so daß er über den kurzen vorbestimmten Zeitraum den Steuerschaltkreis anspricht.From JP-A 60 26135 a circuit for controlling an injection device is known. The purpose of this circuit is to keep the injector open state stable, applying a high current pulse (I MAX ) to the injector at the beginning of the injection process and applying a long current pulse with a low current value (I HOLD ) during the open state . The injection valve is opened with the high current pulse (I MAX ) and held in its open position with the long current pulse (I HOLD ). The two current values are each generated by a control circuit, which each control a comparator. The control circuit for the initial current pulse (I MAX ) is preceded by a monostable circuit which is driven by the rising edge of the injection signal when the injection signal is applied, so that it responds to the control circuit over the short predetermined period.

Ferner geht aus der JP-A-62 210 241 eine Schaltung zur Ansteuerung einer mit einem Piezoelement arbeitenden Einspritzvorrichtung hervor. Diese Schaltung weist einen Transformator auf, an dessen Ausgangsseite ein Piezoelement angeschlossen ist. Die Spule der Eingangsseite des Transformators ist über einen Leistungstransistor und einen Meßwiderstand geerdet. Der Steuereingang des Transistors wird mittels eines Komparators angesteuert. Zwischen dem Transistor unter dem Komparator ist eine Flip-Flop-Schaltung angeordnet. Die Flip-Flop-Schaltung wird eingeschaltet, wenn ein Einspritzimpuls angelegt wird, um an den Transistor ein Ausgangssignal anzulegen. Wenn der Strom am Widerstand einen vorbestimmten Wert erreicht, wird die Flip-Flop-Schaltung durch den Komparator zurückgesetzt und folglich der Transistor ausgeschaltet. Der Strom durch den Transistor wird somit abgebrochen, wenn ein vorbestimmter Stromwert erreicht wird.Furthermore, JP-A-62 210 241 shows a circuit for controlling an injection device working with a piezo element. This circuit has a transformer, on the output side of which a piezo element is connected. The coil on the input side of the transformer is grounded via a power transistor and a measuring resistor. The control input of the transistor is controlled by means of a comparator. A flip-flop circuit is arranged between the transistor under the comparator. The flip-flop circuit is turned on when an injection pulse is applied to apply an output signal to the transistor. When the current across the resistor reaches a predetermined value, the flip-flop circuit is reset by the comparator and the transistor is consequently switched off. The current through the transistor is thus terminated when a predetermined current value is reached.

Diese Schaltung ist somit vorgesehen, um den Anstieg eines Stromverlaufs bis zu einem vorbestimmten Wert zu steuern, aber nicht um den Ausgang des Transformators auf einem bestimmten Stromwert zu halten.This circuit is thus provided in order to control the increase in a current profile up to a predetermined value, but not to keep the output of the transformer at a specific current value.

Aufgabe der Erfindung ist es, eine mit einer Erregerspule elektromagnetisch angetriebenen Hubkolbenpumpe mit einer Schaltung zur Ansteuerung der Erregerspule zu schaffen, die für eine Kraftstoff-Einspritzvorrichtung verwendet wird, wobei eine differenzierbare Kraftstoffmenge mit der Hubkolbenpumpe dosiert werden soll, wobei die Hubkolbenpumpe weitgehend unabhängig von der Spulenerwärmung und von Schwankungen der Versorgungsspannung arbeitet.The object of the invention is to provide a reciprocating pump driven electromagnetically with an excitation coil with a circuit for controlling the excitation coil, which is used for a fuel injection device, a differentiable amount of fuel to be metered with the reciprocating pump, the reciprocating pump being largely independent of the Coil heating and fluctuations in the supply voltage works.

Diese Aufgabe wird durch die Merkmale des Anspruchs 1 gelöst. Anhand der Zeichnung wird die Erfindung im folgenden beispielhaft näher erläutert. Es zeigen:

Fig. 1
beispielhaft eine Kraftstoff-Einspritzvorrichtung,
Fig. 2
das Schaltbild der erfindungsgemäßen Schaltung.
This object is solved by the features of claim 1. The invention is explained in more detail below using the drawing as an example. Show it:
Fig. 1
an example of a fuel injection device,
Fig. 2
the circuit diagram of the circuit according to the invention.

Im Falle eines elektromagnetischen Antriebes einer Kraftstoff-Einspritzvorrichtung ist insbesondere die Erregung, d.h. das Produkt aus Windungszahl der Spule und Stromstärke des Stroms, der die Spule durchsetzt, bestimmend für die elektromagnetische Energieumwandlung. Das heißt, eine ausschließliche Steuerung der Stromamplitude erlaubt es, das Schaltverhalten des Antriebsmagneten unabhängig von Einflüssen der Spulenerwärmung und einer schwankenden Versorgungsspannung eindeutig definiert zu gestalten. Damit trägt eine derartige Steuerung insbesondere den bei Motoren üblicherweise stark schwankenden elektrischen Spannungsverhältnissen und den unterschiedlichen Temperaturverhältnissen Rechnung.In the case of an electromagnetic drive of a fuel injection device, the excitation, i.e. the product of the number of turns of the coil and the current strength of the current that passes through the coil, determining for the electromagnetic energy conversion. This means that an exclusive control of the current amplitude allows the switching behavior of the drive magnet to be uniquely defined regardless of the effects of coil heating and a fluctuating supply voltage. In this way, such a control system takes into account in particular the electrical voltage conditions and the different temperature conditions, which usually fluctuate strongly in motors.

Bei der in Fig. 1 dargestellten Kraftstoff-Einspritzvorrichtung ist ein anfänglicher Teilhub des Förderelements der Einspritzpumpe vorgesehen, bei dem die Verdrängung des Kraftstoffs keinen Druckaufbau zur Folge hat, wobei der der Energiespeicherung dienende Förderelementteilhub zweckmäßigerweise durch ein Speichervolumen, z.B. in Form eines Leervolumens und ein Anschlagelement bestimmt wird, die unterschiedlich gestaltet sein können und die auf einem Hubweg "X" des Förderelements der Hubkolbenpumpe die Verdrängung von Kraftstoff zulassen; erst dann, wenn das Verdrängen des Kraftstoffs abrupt unterbrochen wird, wird ein schlagartiger Druckaufbau im Kraftstoff erzeugt, so daß eine Verdrängung des Kraftstoffs in Richtung Einspritzdüse bewirkt wird. Die Einspritzvorrichtung nach Fig. 1 weist eine elektromagnetisch angetriebene Hubkolbenpumpe 1 auf, die über eine Förderleitung 2 an eine Einspritzdüseneinrichtung 3 angeschlossen ist. Von der Förderleitung 2 zweigt eine Ansaugleitung 4 ab, die mit einem Kraftstoff-Vorratsbehälter 5 (Tank) in Verbindung steht. Zudem ist an die Förderleitung 2 etwa im Bereich des Anschlusses der Ansaugleitung 4 ein Volumenspeicherelement 6 über eine Leitung 7 angeschlossen.In the fuel injection device shown in FIG. 1, an initial partial stroke of the delivery element of the injection pump is provided, in which the displacement of the fuel does not result in a pressure build-up, the delivery element partial stroke serving for energy storage expediently being provided by a storage volume, for example in the form of an empty volume and a Stop element is determined, which can be designed differently and which allow the displacement of fuel on a stroke "X" of the delivery element of the reciprocating pump; only when the displacement of the fuel is abruptly interrupted is an abrupt pressure build-up generated in the fuel, so that the fuel is displaced in the direction of the injection nozzle. The injection device according to FIG. 1 has an electromagnetically driven reciprocating piston pump 1, which is connected to an injection nozzle device 3 via a delivery line 2. A suction line 4 branches off from the delivery line 2 and is connected to a fuel reservoir 5 (tank). In addition, the delivery line 2 is approximately in the area of Connection of the intake line 4, a volume storage element 6 connected via a line 7.

Die Pumpe 1 ist als Kolbenpumpe ausgebildet und hat ein Gehäuse 8, in dem eine Magnetspule 9 lagert, einen im Bereich des Spulendurchgangs angeordneten Anker 10, der als zylindrischer Körper, beispielsweise als Vollkörper ausgebildet und in einer Gehäusebohrung 11 geführt ist, die sich im Bereich der Zentrallängsachse der Ringspule 9 befindet, und mittels einer Druckfeder 12 in eine Ausgangsstellung gedrückt wird, in welcher er am Boden lla der Gehäusebohrung 11 anliegt. Abgestützt ist die Druckfeder 12 an der einspritzdüsenseitigen Stirnfläche des Ankers 10 und einer dieser Stirnfläche gegenüberliegenden Ringstufe 13 der Gehäusebohrung 11. Die Feder 12 umfaßt mit Spiel einen Förderkolben 14, der mit dem Anker 10 an der von der Feder 12 beaufschlagten Ankerstirnfläche fest, z.B. einstückig, verbunden ist. Der Förderkolben 14 taucht relativ tief in einen zylindrischen Kraftstofförderraum 15 ein, der koaxial in axialer Verlängerung der Gehäusebohrung 11 im Pumpengehäuse 8 ausgebildet ist und in Übertragungsverbindung mit der Druckleitung 2 steht. Aufgrund der Eintauchtiefe können Druckverluste während des schlagartigen Druckanstiegs vermieden werden, wobei die Fertigungstoleranzen zwischen Kolben 14 und Zylinder 15 sogar relativ groß sein können, z.B. lediglich im Hundertstel Millimeterbereich zu liegen brauchen, so daß der Herstellungsaufwand gering ist.The pump 1 is designed as a piston pump and has a housing 8 in which a magnet coil 9 is mounted, an armature 10 which is arranged in the region of the coil passage and is designed as a cylindrical body, for example as a solid body, and is guided in a housing bore 11 which is located in the region the central longitudinal axis of the ring coil 9, and is pressed by means of a compression spring 12 into an initial position in which it rests on the bottom 11a of the housing bore 11. The compression spring 12 is supported on the end face of the armature 10 on the injection nozzle side and an annular step 13 of the housing bore 11 opposite this end face. The spring 12 includes, with play, a delivery piston 14 which is fixed to the armature 10 on the armature end face acted upon by the spring 12, e.g. in one piece, is connected. The delivery piston 14 plunges relatively deep into a cylindrical fuel delivery chamber 15 which is formed coaxially in the axial extension of the housing bore 11 in the pump housing 8 and is in transmission connection with the pressure line 2. Due to the immersion depth, pressure losses during the sudden pressure increase can be avoided, and the manufacturing tolerances between piston 14 and cylinder 15 can even be relatively large, e.g. only need to be in the hundredth of a millimeter range, so that the manufacturing effort is low.

In der Ansaugleitung 4 ist ein Rückschlagventil 16 angeordnet. Im Gehäuse 17 des Ventils 16 ist als Ventilelement beispielsweise eine Kugel 18 angeordnet, die in ihrer Ruhestellung durch eine Feder 19 gegen ihren Ventilsitz 20 am vorratsbehälterseitigen Ende des Ventilgehäuses 17 gedrückt wird. Zu diesem Zweck ist die Feder 19 einerseits abgestützt an der Kugel 18 und andererseits an der dem Ventilsitz 20 gegenüberliegenden Wandung des Gehäuses 17 im Bereich der Mündung 21 der Ansaugleitung 4.A check valve 16 is arranged in the intake line 4. A ball 18, for example, is arranged in the housing 17 of the valve 16 as a valve element, which in its rest position is pressed by a spring 19 against its valve seat 20 at the end of the valve housing 17 on the reservoir side. For this purpose, the spring 19 is supported on the one hand on the ball 18 and on the other hand on the wall of the housing 17 opposite the valve seat 20 in the region of the mouth 21 of the intake line 4.

Das Speicherelement 6 weist ein z.B. zweiteilig ausgebildetes Gehäuse 22 auf, in dessen Hohlraum als zu verdrängendes Organ eine Membran 23 gespannt ist, die von dem Hohlraum einen druckleitungsseitigen, mit Kraftstoff gefüllten Raum abtrennt, und die im entspannten Zustand den Hohlraum in zwei Häften teilt, die durch die Membran gegeneinander abgedichtet sind. An der der Leitung 7 abgewandten Seite der Membran 23 greift in einem Leerraum, dem Speichervolumen, eine diese beaufschlagende Federkraft z..B. eine Feder 24 an, die als Rückstellfeder für die Membran 23 eingerichtet ist. Die Feder 24 ist mit ihrem der Membran gegenüberliegenden Ende an einer Innenwandung des zylindrisch erweiterten leeren Hohlraums gelagert. Der leere Hohlraum des Gehäuses 22 ist durch eine gewölbeförmige Wandung begrenzt, die eine Anschlagfläche 22a für die Membran 23 ausbildet.The storage element 6 has e.g. two-part housing 22, in the cavity of which a membrane 23 is tensioned as the organ to be displaced, which separates a pressure line-side space filled with fuel from the cavity, and which divides the cavity into two halves in the relaxed state, which is sealed off from one another by the membrane are. On the side of the membrane 23 facing away from the line 7, an elastic force acting on it acts on an empty space, the storage volume, for example. a spring 24, which is set up as a return spring for the membrane 23. The spring 24 is supported with its end opposite the membrane on an inner wall of the cylindrically widened empty cavity. The empty cavity of the housing 22 is delimited by an arched wall, which forms a stop surface 22a for the membrane 23.

Die Spule 9 der Pumpe 1 ist an eine Steuereinrichtung 26 angeschlossen, die als elektronische Steuerung für die Einspritzvorrichtung dient.The coil 9 of the pump 1 is connected to a control device 26 which serves as an electronic control for the injection device.

Im stromlosen Zustand der Spule 9 befindet sich der Anker 10 der Pumpe 1 durch die Vorspannung der Feder 12 am Boden 11a. Das Kraftstoffzulaufventil 16 ist dabei geschlossen und die Speichermembran 23 wird durch die Feder 24 in ihrer von der Anschlagfläche 22a abgerückten Stellung im Gehäusehohlraum gehalten.In the de-energized state of the coil 9, the armature 10 of the pump 1 is located on the base 11a due to the pretensioning of the spring 12. The fuel supply valve 16 is closed and the storage membrane 23 is held in the housing cavity by the spring 24 in its position away from the stop surface 22a.

Bei Ansteuerung der Spule 9 über die Steuereinrichtung 26 wird der Anker 10 mit Kolben 14 gegen die Kraft der Feder 12 in Richtung Einspritzventil 3 bewegt. Dabei verdrängt der mit dem Anker 10 in Verbindung stehende Förderkolben 14 aus dem Förderzylinder 15 Kraftstoff in den Raum des Speicherelements 6. Die Federkräfte der Federn 12, 24 sind relativ weich ausgebildet, so daß durch den Förderkolben 14 verdrängter Kraftstoff während des ersten Teilhubes des Förderkolbens 14 nahezu ohne Widerstand die Speichermembran 23 in den Leerraum drückt. Dadurch kann der Anker 10 zunächst fast widerstandsfrei beschleunigt werden bis das Speichervolumen bzw. Leerraumvolumen des Speicherelements 6 durch Auftreffen der Membran 23 auf die Gewölbewandung 22a erschöpft ist. Die Verdrängung des Kraftstoffs wird dadurch plötzlich gestoppt und der Kraftstoff infolge der bereits hohen kinetischen Energie des Förderkolbens 14 schlagartig verdichtet. Die kinetische Energie des Ankers 10 mit Förderkolben 14 wirkt auf die Flüssigkeit ein. Dabei entsteht ein Druckstoß, der durch die Druckleitung 2 zur Düse 3 wandert und dort zum Abspritzen von Kraftstoff führt.When the coil 9 is actuated via the control device 26, the armature 10 with the piston 14 is moved in the direction of the injection valve 3 against the force of the spring 12. The feed piston 14 connected to the armature 10 displaces fuel from the feed cylinder 15 into the space of the storage element 6. The spring forces of the springs 12, 24 are relatively soft, so that fuel displaced by the feed piston 14 during the first partial stroke of the feed piston 14 presses the storage membrane 23 into the empty space almost without resistance. As a result, the armature 10 can initially be accelerated almost without resistance until the storage volume or empty space volume of the storage element 6 is exhausted by hitting the membrane 23 on the vault wall 22a. The displacement of the fuel is suddenly stopped and the fuel is suddenly compressed due to the already high kinetic energy of the delivery piston 14. The kinetic energy of the armature 10 with the delivery piston 14 acts on the liquid. This creates a pressure surge that travels through the pressure line 2 to the nozzle 3 and there leads to the spraying of fuel.

Für das Förderende wird die Spule 9 stromlos geschaltet. Der Anker 10 wird durch die Feder 12 zum Boden 11a zurückbewegt. Dabei wird die in der Speichereinrichtung 6 gespeicherte Flüssigkeitsmenge über die Leitungen 7 und 2 in den Förderzylinder 15 zurückgesaugt und die Membran 23 infolge der Wirkung der Feder 24 in ihre Ausgangsstellung zurückgedrückt. Gleichzeitig öffnet das Kraftstoffzulaufventil 16, so daß Kraftstoff aus dem Tank 5 nachgesaugt wird.For the end of the delivery, the coil 9 is switched off. The armature 10 is moved back to the floor 11a by the spring 12. The amount of liquid stored in the storage device 6 is sucked back via the lines 7 and 2 into the delivery cylinder 15 and the membrane 23 is pushed back into its starting position due to the action of the spring 24. At the same time, the fuel supply valve 16 opens, so that fuel is sucked out of the tank 5.

Zweckmäßigerweise ist in der Druckleitung 2 zwischen dem Einspritzventil 3 und den Abzweigungen 4, 7 ein Ventil 16a angeordnet, das in dem einspritzventilseitigen Raum einen Standruck aufrecht erhält, der z.B. höher ist als der Dampfdruck der Flüssigkeit bei maximal auftretender Temperatur, so daß Blasenbildung verhindert wird. Das Standdruckventil kann z.B. wie das Ventil 16 ausgebildet sein.A valve 16a is expediently arranged in the pressure line 2 between the injection valve 3 and the branches 4, 7 and maintains a stand pressure in the space on the injection valve side, which e.g. is higher than the vapor pressure of the liquid at the maximum temperature, so that bubbles are prevented. The parking pressure valve can e.g. be designed as the valve 16.

Eine derartige beispielsweise beschriebene Kraftstoff-Einspritzvorrichtung erfordert eine Ansteuerung der Erregerspule 9, die eine differenzierte Mengendosierung mit der Hubkolbenpumpe 1 ermöglicht.Such a fuel injection device, described for example, requires activation of the excitation coil 9, which enables differentiated metering with the reciprocating pump 1.

Fig. 2 zeigt die erfindungsgemäße Zweipunktregelungsschaltung für die Stromamplitude des einen Pumpenantriebsspule 9, 600 steuernden Stroms. Die Antriebsspule 600 ist an einen Leistungstransistor 601 angeschlossen, der über einen Meßwiderstand 602 an Masse liegt. An den Steuereingang des Transistors 601, beispielsweise an die Transistorbasis ist ein Komparator 603 mit seinem Ausgang angelegt. Der nicht invertierende Eingang des Komparators 603 wird von einem Stromsollwert beaufschlagt, der beispielsweise mittels eines Mikrocomputers gewonnen wird. Der invertierende Eingang des Komparators 603 ist an der Seite des Meßwiderstands angeschlossen, die mit dem Transistor 601 verbunden ist.2 shows the two-point control circuit according to the invention for the current amplitude of the current controlling a pump drive coil 9, 600. The drive coil 600 is connected to a power transistor 601 which is connected to ground via a measuring resistor 602. A comparator 603 is connected to the control input of transistor 601, for example to the transistor base created its exit. The non-inverting input of the comparator 603 is acted upon by a current setpoint, which is obtained for example by means of a microcomputer. The inverting input of comparator 603 is connected to the side of the measuring resistor which is connected to transistor 601.

Um den Energiefluß in der Antriebsspule 9, 600 unabhängig von der Versorgungsspannung zu steuern, wird der von der Spule 9, 600 aufgenommene Strom durch den Meßwiderstand 602 gemessen. Erreicht dieser Strom den von einem Mikroprozessor als Stromsollwert vorgegebenen Grenzwert, schaltet der Komparator 603 über den Leistungstransistor 601 den Strom für die Spule 9, 600 aus. Sobald der Stromistwert unter den Stromsollwert sinkt, schaltet der Transistor 601 über den Komparator 603 den Strom wieder ein. Die durch die Induktivität der Spule 9, 600 bedingte Stromanstiegsverzögerung verhindert ein zu schnelles überschreiten des maximal zulässigen Stroms.In order to control the energy flow in the drive coil 9, 600 independently of the supply voltage, the current consumed by the coil 9, 600 is measured by the measuring resistor 602. If this current reaches the limit value specified by a microprocessor as the current setpoint, the comparator 603 switches off the current for the coil 9, 600 via the power transistor 601. As soon as the actual current value falls below the current setpoint, the transistor 601 switches the current on again via the comparator 603. The current rise delay caused by the inductance of the coil 9, 600 prevents the maximum permissible current from being exceeded too quickly.

Danach kann der nächste Schaltzyklus beginnen und dieses Takten des Spulenstromes der Spule 9, 600 findet so lange statt, wie die den Stromsollwert liefernde Referenzspannung am nicht invertierenden Eingang des Komparators 603 anliegt.The next switching cycle can then begin and this clocking of the coil current of the coil 9, 600 takes place as long as the reference voltage supplying the current setpoint is present at the non-inverting input of the comparator 603.

Die erfindungsgemäße Schaltung stellt eine getaktete Stromquelle dar, wobei das Takten erst nach Erreichen des vom Mikroprozessor bereitgestellten Stromsollwertes einsetzt. Die Energie- und damit Mengensteuerung der Pumpeneinrichtug 1 kann mit dieser Schaltung in Kombination von Dauer und/oder Höhe der vom Mikroprozessor bereitgestellten Referenzspannung erfolgen.The circuit according to the invention represents a clocked current source, the clocking only starting after the current setpoint provided by the microprocessor has been reached. The energy and thus the quantity control of the pump device 1 can take place with this circuit in combination of the duration and / or the amount of the reference voltage provided by the microprocessor.

Claims (1)

  1. Reciprocating pump of a fuel injection device, having an exciting coil (9) and an armature (10) which is the moving component of the delivery element of the reciprocating pump (1), provision being made for an initial part-stroke of the delivery element (15) during which the displacement of the fuel does not result in a pressure build-up, and this part-stroke of the delivery element, serving for energy storage, being abruptly interrupted by a stopping element (6) situated in a pressure line (2) arranged between the delivery element (15) and an injection nozzle (3), and an abrupt pressure build-up being produced in the fuel so that a displacement of the fuel towards the injection nozzle (3) is effected, and for the metering of a differentiable fuel quantity a circuit for triggering the exciting coil being used, the exciting coil (9, 600) being connected to a power transistor (601) as current switch, which is earthed via a measuring resistor (602) as current meter, and the output of a comparator (603) being applied to the control input of the transistor (601), for example to the transistor base, and a current set point, obtained for example by means of a microcomputer, being applied to the non-inverting input of the comparator (603), and the inverting input of the comparator (603) being connected on the side of the measuring resistor (602) connected to the transistor (601), and with the circuit a clocked power source being effected and a set point for differentiable fuel quantities, preset in duration and level by a microcomputer, being preset.
EP93905298A 1992-03-04 1993-03-04 Reciprocating piston pump Expired - Lifetime EP0629264B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4206817 1992-03-04
DE4206817A DE4206817C2 (en) 1991-10-07 1992-03-04 Fuel injection device based on the solid-state energy storage principle for internal combustion engines
PCT/EP1993/000494 WO1993018290A1 (en) 1992-03-04 1993-03-04 Circuit for controlling an exciting coil of an electromagnetically driven reciprocating piston pump

Publications (2)

Publication Number Publication Date
EP0629264A1 EP0629264A1 (en) 1994-12-21
EP0629264B1 true EP0629264B1 (en) 1996-07-24

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Family Applications (5)

Application Number Title Priority Date Filing Date
EP93905298A Expired - Lifetime EP0629264B1 (en) 1992-03-04 1993-03-04 Reciprocating piston pump
EP93905295A Expired - Lifetime EP0630442B1 (en) 1992-03-04 1993-03-04 Fuel injection device working according to the solid energy accumulator principal, for internal combustion engines
EP96109438A Expired - Lifetime EP0733798B1 (en) 1992-03-04 1993-03-04 Fuel injection device working according to the solid energy accumulator principle, for internal combustion engines
EP93905299A Expired - Lifetime EP0629265B1 (en) 1992-03-04 1993-03-04 Fuel injecting device working according to the solid energy accumulator principle, for internal combustion engines
EP96101218A Expired - Lifetime EP0725215B1 (en) 1992-03-04 1993-03-04 Fuel injection device working according to the solid energy accumulator principle, for internal combustion engines

Family Applications After (4)

Application Number Title Priority Date Filing Date
EP93905295A Expired - Lifetime EP0630442B1 (en) 1992-03-04 1993-03-04 Fuel injection device working according to the solid energy accumulator principal, for internal combustion engines
EP96109438A Expired - Lifetime EP0733798B1 (en) 1992-03-04 1993-03-04 Fuel injection device working according to the solid energy accumulator principle, for internal combustion engines
EP93905299A Expired - Lifetime EP0629265B1 (en) 1992-03-04 1993-03-04 Fuel injecting device working according to the solid energy accumulator principle, for internal combustion engines
EP96101218A Expired - Lifetime EP0725215B1 (en) 1992-03-04 1993-03-04 Fuel injection device working according to the solid energy accumulator principle, for internal combustion engines

Country Status (9)

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US (3) US5520154A (en)
EP (5) EP0629264B1 (en)
JP (8) JPH07504475A (en)
AT (5) ATE140768T1 (en)
AU (5) AU671100B2 (en)
CA (3) CA2127799C (en)
DE (5) DE59308851D1 (en)
HK (1) HK1013676A1 (en)
WO (3) WO1993018297A1 (en)

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JP2626677B2 (en) 1997-07-02
JPH09177636A (en) 1997-07-11
JP2002089413A (en) 2002-03-27
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CA2127800A1 (en) 1993-09-16
CA2127801A1 (en) 1993-09-16
EP0725215A3 (en) 1996-08-21
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DE59310057D1 (en) 2000-07-13
CA2127801C (en) 1999-06-15
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US6188561B1 (en) 2001-02-13
US5520154A (en) 1996-05-28
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ATE193753T1 (en) 2000-06-15
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ATE146851T1 (en) 1997-01-15
ATE154100T1 (en) 1997-06-15
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