EP3173624A2 - Soupape de réglage du volume d'alimentation d'une pompe volumétrique - Google Patents

Soupape de réglage du volume d'alimentation d'une pompe volumétrique Download PDF

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Publication number
EP3173624A2
EP3173624A2 EP16206318.4A EP16206318A EP3173624A2 EP 3173624 A2 EP3173624 A2 EP 3173624A2 EP 16206318 A EP16206318 A EP 16206318A EP 3173624 A2 EP3173624 A2 EP 3173624A2
Authority
EP
European Patent Office
Prior art keywords
valve
fluid
piston
pump
positive displacement
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP16206318.4A
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German (de)
English (en)
Other versions
EP3173624A3 (fr
EP3173624B1 (fr
Inventor
Christof Lamparski
Jürgen Bohner
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.)
Schwaebische Huettenwerke Automotive GmbH
Original Assignee
Schwaebische Huettenwerke Automotive GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
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Application filed by Schwaebische Huettenwerke Automotive GmbH filed Critical Schwaebische Huettenwerke Automotive GmbH
Publication of EP3173624A2 publication Critical patent/EP3173624A2/fr
Publication of EP3173624A3 publication Critical patent/EP3173624A3/fr
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Publication of EP3173624B1 publication Critical patent/EP3173624B1/fr
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/18—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber
    • F04C14/185—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by varying the useful pumping length of the cooperating members in the axial direction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/18—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber
    • F04C14/22—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members
    • F04C14/223—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members using a movable cam
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2210/00—Fluid
    • F04C2210/14—Lubricant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/18—Pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/20—Flow
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/86493—Multi-way valve unit
    • Y10T137/86574—Supply and exhaust
    • Y10T137/86622—Motor-operated
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/86493—Multi-way valve unit
    • Y10T137/86574—Supply and exhaust
    • Y10T137/8667—Reciprocating valve
    • Y10T137/86694—Piston valve
    • Y10T137/86702—With internal flow passage

Definitions

  • the invention relates to an adjustment valve for the adjustment of the delivery volume of a positive displacement pump and a positive displacement pump with the adjustment valve, which is arranged for the adjustment of the delivery volume of a fluid to be delivered by the pump in a fluid circuit of the pump.
  • the invention accordingly also relates to the adjustment valve as such, as far as it is provided for the adjustment of the delivery volume of a positive displacement pump.
  • Positive displacement pumps deliver fluids at a volume flow proportional to the pump speed.
  • the delivery volume per revolution or reciprocating stroke, the so-called specific volume flow is constant or, in practice, can be regarded as constant, at least to a good approximation.
  • the constancy per revolution or stroke and, accordingly, the proportionality to the pump speed is troublesome, for example, in applications in which the unit to be supplied by the respective pump has a fluid requirement which is lower in one or more speed range (s) of the pump than that from the Proportionality resulting volumetric flow. Accordingly, in the respective speed range, the pump delivers a volume flow above the demand, which is dissipated with loss.
  • the problem is in the US 6 126 420 B described that already discloses an internal gear pump with adjustable delivery volume to solve the problem.
  • the US Pat. No. 6,244,839 B1 also discloses an internal gear pump with adjustable delivery volume.
  • the inner gear is axially displaceable relative to the outer gear.
  • the inner gear is part of an axially displaceable adjusting unit, which is formed as a double-acting piston.
  • the adjusting unit is acted upon by a 4/3-way adjusting valve with the pumped fluid from the pump.
  • the adjustment valve has a valve housing and a valve piston axially reciprocating valve piston which is acted upon at one axial end with the funded fluid and at the other axial end with a pressure of the fluid counteracting force of a valve spring.
  • the position of the valve piston is adjusted according to the Balance the force of the valve spring and the force generated by the fluid pressure.
  • the adjustment valve is designed so that the adjustment of the pump moves when reaching a predetermined by the valve spring fluid pressure from an axial position for maximum delivery volume toward an axial position for minimum delivery.
  • the preload force of the valve spring is adjusted at the adjustment valve in
  • a positive displacement pump with an adjusting valve is known, the movable valve piston for adjusting the delivery volume of the pump in an axial direction with fluid of the high pressure side of the pump and the fluid counteracting acted upon by a spring force.
  • a control device is provided for the adjusting valve, which exerts an additional force on the valve piston.
  • control means an electric stepping motor for adjusting the biasing force of the valve spring and a magnetic coil for generating an additional magnetic force are called.
  • the switched by means of the adjustment fluid flow acts on a displacement unit of the pump only in the direction of maximum delivery volume, while in the opposite direction always the pressure of the high pressure side acts.
  • the invention is based on a positive displacement pump for the supply of an aggregate with fluid, which has a pump housing with a delivery chamber and a delivery member movable in the delivery member, which acts directly on the fluid to convey it through the delivery chamber.
  • the conveying member can convey the fluid alone or in cooperation with one or possibly several further conveying members from an inlet of the conveying chamber while increasing the pressure through an outlet of the conveying chamber.
  • the inlet becomes a low pressure side and the outlet is assigned to a high pressure side of the pump.
  • the pump is preferably arranged in a closed fluid circuit, but in principle can also serve to convey the fluid in an open fluid circuit.
  • the pump When integrated in a closed fluid circuit, it draws the fluid on the low-pressure side from a reservoir through the inlet into the delivery chamber and conveys it on the high pressure side to the or possibly several to be supplied with the fluid unit (s). downstream from the aggregate (s) the fluid returns to the reservoir, closing the fluid circuit.
  • the pump can be used for example for the supply of a hydraulic press with pressurized fluid.
  • it is installed in a motor vehicle or provided for installation in order to supply an internal combustion engine driving the motor vehicle with lubricating fluid or an automatic transmission with hydraulic fluid.
  • the internal combustion engine drives the pump.
  • the displacement pump further comprises an adjustment valve, adjusted by means of which the delivery volume of the pump adapted to the needs of at least one unit to be supplied and the energy required for driving the pump can be preferably reduced accordingly.
  • the adjustment valve comprises a valve housing, a valve piston movable in the valve body, a valve spring and an adjusting device.
  • the valve piston has an active surface for a fluidic valve set pressure.
  • the valve spring is arranged so that it acts counter to the total acting on the valve body valve actuating pressure on the valve piston.
  • the specific volume flow of the pump is understood as such in preferred embodiments, in the case of a rotary pump, the volume flow per revolution and in the case of a reciprocating pump, the flow rate per stroke.
  • the pump may also be a fixed displacement pump and the adjustment valve may be disposed on the high pressure side of the pump as a bypass valve to deliver excess fluid being conveyed bypassing the at least one unit into the reservoir.
  • a bypass conveyance does not reduce the power consumption of the pump, but still ensures demand-based delivery. In such embodiments, it is not the delivery volume at the outlet of the delivery chamber. but the conveyed to the at least one aggregate funded volume controlled or regulated as needed.
  • a pump adjustable in its delivery volume with such a bypass valve by adjusting the volume flow per revolution or stroke via an adjusting valve according to the invention or otherwise and downstream of the pump, but upstream of the unit to be supplied, part of the pump the pump funded flow diverted and returned unused to a reservoir.
  • the delivery volume of the pump as such, as seen directly at the outlet of the delivery chamber, adjusted by means of the adjustment valve.
  • an actuator is arranged movably in the pump housing, which can be acted upon in the direction of its mobility with a dependent on the need of at least one unit actuating force.
  • the actuator may be arranged in particular to an end face of the conveyor member or the conveyor member surrounding.
  • the actuator and the delivery member are in first variants part of an in the pump housing as a whole back and forth movable adjustment, for example, a linearly movable or pivotable or otherwise movable transversely to a rotation axis of the preferably rotatable conveyor member adjustment. Examples of such adjusting units describe, for example, the US Pat. No.
  • the actuator is adjustable relative to the conveyor member and the pump housing.
  • the actuator of the second variant may in particular be a collar surrounding the conveyor member, as known from vane pumps including vane pumps, pendulum slide pumps, and also internal gear pumps to adjust the eccentricity to the conveyor member, for example by a linear lifting or pivotal movement of the actuator.
  • the actuating force is preferably generated fluidically by the actuator forming an actuating piston, which is acted upon by a pressurized fluid.
  • This pressure fluid can be branched off, in particular, on the high-pressure side of the pump and can be returned to the actuator via the adjustment valve as a partial flow of the total volume flow delivered by the pump.
  • the pressurized fluid applied to the actuator may in principle also be another fluid, for example a fluid which is provided from a pressure reservoir or from another pump.
  • a partial flow of the fluid is conducted via the adjustment valve into the delivery chamber back to the low-pressure side in order to increase the degree of filling of delivery cells there, as described, for example, in US Pat US Pat. No. 6,935,851 B2 is disclosed. Due to the return and filling of the conveyor cells, the delivery volume is also adjusted at the same time, whereby this type of adjustment can also be realized in combination with one of the other types mentioned above.
  • the adjusting device is formed so that it can adjust the valve piston in the direction of the force exerted by the valve actuating pressure on the valve body or against the valve actuating pressure. It preferably acts electromagnetically.
  • the word "or” here and elsewhere in the sense of the invention includes the meaning of "either ......... or” and also the meaning of "and”, as far as the respective context does not necessarily mean a limited one Meaning surrounds.
  • the adjustment means may be designed to counteract or preferably counteract the force of the valve set pressure only in the same direction and the valve spring, and alternatively may be constructed to bias the valve piston both in and against the force of the valve set pressure can adjust.
  • valve actuating pressure and a force exerted by the adjusting device on the valve piston act together against the force of the valve spring. If the valve actuating pressure increases, the valve piston can be adjusted by means of a correspondingly smaller force of the adjusting device against the force of the valve spring.
  • the adjusting device for adjusting the valve piston is set up both in the direction of the valve set pressure and against the valve set pressure. If the adjustment device is a magnetic adjustment device with only a single magnetic coil, the magnetic coil can be repolished in such embodiments. Alternatively, for each of two directions of movability of the valve piston, a separate solenoid with one armature each may be provided and one of these armatures on the valve piston exert a force in one arm and the other armature force in the other direction of movability of the valve piston to move the valve piston back and forth.
  • the position of the valve piston can thus be adjusted relative to the valve housing, at least in the second embodiment, but preferably also in the first embodiment, independently of the acting on the effective surface valve actuating pressure, and the delivery volume of the pump can be adjusted accordingly.
  • the adjustment valve can thus set the delivery volume over a larger operating range of the unit to be supplied continuously or arbitrarily adjusted and adjusted not only to a certain pressure, when reached the delivery volume.
  • a control or regulating device for the adjusting valve is arranged so that by means of the adjusting valve, the delivery volume over the entire operating range of the unit is adjusted adjusted.
  • the valve spring and the valve spring constantly counteracting the force of the valve spring secure supply of the unit, albeit in case of failure of the adjustment only as known from conventional positive displacement pumps with a reduction of the delivery volume as a function of the biasing force and spring constants of the valve spring.
  • the invention combines a precise and flexible adaptability to the needs with a guaranteed even in case of failure of the adjustment supply security, it creates a so-called second-level control or regulation for the delivery volume.
  • the adjustment valve is preferably a proportional valve. It is preferably controlled electrically.
  • the adjusting device preferably acts magnetically. It may comprise a proportional solenoid which is voltage or current controlled or regulated, that is to say by a variation of the applied voltage or current, oriented to the needs of the at least one aggregate.
  • the adjustment valve is controlled or regulated in a pulse-modulated manner.
  • the duration of the individual pulses or the time interval between two successive pulses of the manipulated variable can be varied, which also includes the case that both the pulse duration and the time duration between successive pulses is varied according to demand.
  • the period of the manipulated variable is preferably constant.
  • a pulse width modulated adjustment valve is used.
  • the period of the manipulated variable for the adjustment valve is significantly smaller than the time constant of the positive displacement pump which determines the adjustment of the delivery volume.
  • the pulse modulation uses the Tiefpass characters the pump. By varying the on-time of the pulse width modulation or the time interval in the case of a pulse frequency modulation adapted to the needs, the flow through the adjustment valve and consequently the displacement of the positive displacement pump can be quasi-continuously controlled or regulated according to the momentary demand of the unit.
  • the adjustment valve is preferably a multi-way valve with at least three ports, preferably with four ports. It is preferably switchable between at least two switch positions, preferably between three switch positions.
  • the adjustment valve is controlled or regulated in preferred embodiments depending on a desired value for the volume flow to be delivered by the positive displacement pump or a fluid supply pressure to be generated by the positive displacement pump.
  • a setpoint specification specifies the setpoint value of a control or regulation device provided for the adjustment valve.
  • the set point is preferably varied depending on the demand of the unit.
  • a characteristic field is specified for the setpoints dependent on the operating state of the unit.
  • the at least one desired value or more preferably the plurality of desired values is or are predefined as a function of a physical variable characterizing the operating state, which is sensed during operation of the unit by means of a detection device.
  • the at least one physical variable may in particular be a temperature, a rotational speed or a load state of the aggregate.
  • the desired value or the desired values for the volume flow or the fluid supply pressure are predefined as a function of at least two variables characterizing the operating state of the unit. If the positive displacement pump is used as a lubricating oil pump for an internal combustion engine, the temperature of the lubricating oil or the cooling fluid in the region of the internal combustion engine or the speed or for the load state can detect or determine the accelerator pedal position or a throttle position, and from this the associated desired value can be determined on the basis of the characteristic field the control or regulating device for the adjustment valve can be specified.
  • the adjustment valve is only controlled as a function of the respective desired value.
  • the detection of an actual value representative of the requirement of the physical quantity forming the desired value, namely of the volume flow or of the fluid supply pressure, is dispensed with, as well as elaborate processing for a control based on a desired / actual comparison.
  • the adjustment valve is regulated as a function of a desired / actual comparison of the respective setpoint value and an actual value of the volume flow or the fluid supply pressure measured continuously or at sufficiently small time intervals. Control is advantageous in cases where the volumetric flow demand of the unit changes due to wear over the life of the unit.
  • a control device which can switch from a controller according to the first embodiment to a control according to the second embodiment.
  • the adjustment valve is initially controlled on the basis of the predefined volumetric flow and, with increasing leakage losses as a result of wear of the unit, is later converted to pressure regulation.
  • an adaptive control device is provided, which detects increasing wear on the basis of a sensory detection of the volume flow or fluid supply pressure and the setpoint or the setpoint characteristic adjusted at least once or in several stages, possibly continuously during the life of the unit shifts.
  • the adjustment valve is controlled on the one hand based on a desired value or a setpoint characteristic map for the fluid supply pressure or the volume flow and additionally current-controlled.
  • a particularly preferred embodiment is an adjustment valve controlled by means of a setpoint value or a plurality of desired values or a setpoint characteristic map for the fluid supply pressure or the volume flow by means of pulse width modulation and additionally current-controlled.
  • pulse width modulated adjustment valve not only for the preferred embodiment as pulse width modulated adjustment valve, but also be operated at differently controlled adjustment valves.
  • a current control in addition to the control of a setpoint or setpoint characteristic map for the flow or the fluid supply pressure can be dispensed with a flow or pressure control, although in the case of a current control additionally a flow or pressure control can be used.
  • the control or regulating device may be integrated part of the adjusting valve or installed separately from it.
  • the setpoint specification can be embodied component of the control or regulation device or representational separately from the other parts of the control or regulating device.
  • the adjustment valve is preferably an integral part of the positive displacement pump, for example mounted on the pump housing.
  • the adjustment valve can be advantageously arranged in the integrated embodiment in the housing of the positive displacement pump, for example in a receiving bore or a differently shaped receiving space in a wall of the pump housing.
  • the connections of the adjusting valve can be shaped in such embodiments save space and weight as holes or other shaped channels in the housing, in particular in said housing wall. Accordingly, the pump housing can simultaneously also form the valve housing or only part of the valve housing.
  • the actuator is formed as a double-acting actuator piston with two axially opposite, preferably oppositely facing piston surfaces and by means of the adjustment either one or the other piston surface with a pressurized fluid can be applied, optionally also both piston surfaces simultaneously.
  • the actuator forms an actuating piston which can be pressurized with pressurized fluid, for example a piston which can be pressurized only on one side or preferably a double-acting piston, it is acted upon in preferred embodiments by a pump spring with a spring force, the pump spring acting in the direction of increasing the delivery volume of the pump.
  • the pump spring is so weak that the adjustment dynamics of the pump are not significantly influenced by the pump spring, but exclusively or at least to a significant extent by the adjustment valve. In principle, it is also possible to dispense with a pump spring in such embodiments.
  • a weak pump spring is advantageous, wherein such a pump spring is designed so that it only ensures that in low-speed displacement pump, the maximum pumping speed for this pump speed is promoted. Suffice a pump spring, which exerts on the actuator a spring force corresponding to a fluid pressure of at most 1 bar.
  • the fluid controlled by means of the adjustment valve or regulated to the positive displacement pump for the purpose of adjustment or in the case of an adjustment valve used only as a bypass valve generates the fluid branched off to a reservoir at its flow through the adjustment valve.
  • an adjustment valve used only as a bypass valve generates the fluid branched off to a reservoir at its flow through the adjustment valve.
  • the valve actuating pressure does not require a separate connection.
  • the same inlet, through which the fluid flow flowing through the adjusting valve passes into the adjusting valve also forms the connection for the fluid which generates the valve actuating pressure.
  • valve actuating pressure is generated by means of a plurality of active surfaces, preferably by means of exactly two active surfaces which differ in size, so that the valve actuating pressure exerts a differential force on the valve piston corresponding to the area difference of the active surfaces.
  • the feature of the differential force is combined with the further feature, after which the fluid also simultaneously generates the valve set pressure during the flow through the adjustment valve.
  • the biasing force of the valve spring can be adjusted, preferably fluidly while the positive displacement pump delivers the fluid.
  • the adjustment valve may have a further piston. which preferably serves only to adjust the biasing force and preferably is acted upon by the fluid, which also generates the valve actuating pressure. wherein for the piston for adjusting the biasing force provided a separate connection or preferably a force acting on this adjusting piston force can also be generated by the fluid flowing through.
  • FIG. 1 shows a positive displacement pump in a cross section.
  • a delivery chamber having an inlet 2 on a low pressure side and an outlet 3 on a high pressure side is formed.
  • a first delivery member 4 and a second delivery member 5 are movably arranged in the delivery chamber.
  • the conveying members 4 and 5 are in a conveying engagement with each other. If the conveying members 4 and 5 are driven, they perform a conveying movement in the conveying engagement, through which a fluid, for example lubricating oil or a hydraulic fluid, is sucked through the inlet 2 into the conveying chamber and displaced with higher pressure through the outlet 3.
  • the conveyor member 4 is driven and drives the conveyor member 5 in the conveying engagement.
  • the positive displacement pump of the embodiment is an external gear pump.
  • the conveyor members 4 and 5 are accordingly externally circumferentially toothed conveyor rotors and the conveying engagement a tooth engagement.
  • the conveying members 4 and 5 are rotatably mounted about a respective axis of rotation R 4 and R 5 . In a rotary drive, the sucked fluid from the inlet 2 is transported in each of the conveyor members 4 and 5 formed by the tooth gaps conveyor cells through the region of the so-called loop 1a and ejected through the outlet 3.
  • R 4 and R 5 measured axial length of the conveying engagement of the conveying members 4 and 5, the engagement length, adjustable.
  • the conveying member 5 is relative to the conveying member 4 and the pump housing 1 axially between a position of maximum engagement length and, accordingly, maximum Delivery volume and a position of minimum engagement length and correspondingly minimal delivery volume back and forth movable.
  • FIG. 2 shows the positive displacement pump in a longitudinal section.
  • the conveyor member 4 is secured against rotation on a drive shaft which protrudes from the pump housing 1 and carries a drive wheel for driving the pump.
  • the conveying member 5 is part of an adjusting unit, which comprises an actuator with two adjusting pistons 6 and 7 via the conveying member 5 addition.
  • This adjusting unit 5-7 is as a whole in the pump housing 1 axially movable back and forth to adjust the engagement length can.
  • the conveying member 5 is arranged axially between the adjusting pistons 6 and 7.
  • the actuator 6, 7 supports the conveyor member 5 rotatable about the axis of rotation R 5 .
  • the adjusting unit 5-7 is accommodated in a cylindrical cavity of the pump housing 1.
  • the cavity forms an axial track for the movements of the adjustment 5-7. Furthermore, it forms on one axial side of the adjusting 5-7 a pressure chamber 8 and on the other side a further pressure chamber 9.
  • the control pistons 6 and 7 separate the two pressure chambers 8 and 9 of unavoidable leakage fluidly apart from each other and also from the delivery chamber.
  • the pressure chambers 8 and 9 are each printable with a pressurized fluid, in the embodiment with the funded by the positive displacement pump fluid.
  • a pump spring 10 is arranged, whose spring force acts on the adjusting unit 5-7, namely on the actuating piston 7, in the direction of maximum engagement length.
  • FIG. 3 shows the positive displacement pump integrated into a closed fluid circuit, for example, a lubricating oil circuit of a motor vehicle.
  • the fluid circuit includes a reservoir 11, from which the pump sucks the fluid on the low pressure side through the inlet 2 and higher pressure on the high pressure side through the outlet 3, a connected supply line 12 and a cooling and cleaning device 13 with a radiator and a Filter to the supplied with the fluid unit 14, for example, an internal combustion engine for driving a motor vehicle, promotes. Downstream of the unit 14, the fluid is passed through a conduit 15 back into the reservoir 11.
  • a partial flow 16 of the fluid is diverted and returned via an adjustment valve 20 to the pump.
  • the adjustment valve 20 has an inlet for the partial flow 16, one with the reservoir 11 shorted outlet and two other ports, one of which is connected via a line 18 to the pressure chamber 8 and the other via a line 19 to the pressure chamber 9.
  • the adjustment valve 20 is a multi-way switching valve. In a first switching position, it carries the partial flow 16 into the pressure chamber 8 and connects the pressure chamber 9 with the reservoir 11, thus switching the pressure chamber 9 to ambient pressure. In a second switching position, the adjusting valve in FIG.
  • the adjustment valve 20 of the embodiment can assume three switching positions. namely, the two mentioned switching positions and also a center position in which it separates the pressure chambers 8 and 9 from each other and also from the reservoir 11 and the partial flow 16, so that the respective pressure in the pressure chambers 8 and 9 is maintained, you can see of leaks and associated leakage.
  • a 4/3-way valve was selected for the adjustment valve 20.
  • FIG. 4 shows the adjustment valve 20 as in FIG. 3 as a switching symbol, only in an enlarged view. Entered are the four ports of the adjusting valve 20, of which the inlet for the recirculated partial flow 16 with I, the outlet to the reservoir 11 with O, the connection for the pressure chamber 8 with A and the connection for the pressure chamber 9 with B are designated.
  • the adjustment valve 20 is a proportional valve with a constantly acting fluidic valve set pressure P20, namely the pressure of the recirculated fluid in the partial flow 16, and a valve spring 25, which is the valve actuating pressure P 20 counteracting arranged.
  • the adjustment valve 20 comprises as a proportional valve an adjusting device, which adjusts the adjustment valve 20 adapted to the fluid requirement of the unit 14 from one of the switching positions to another.
  • the valve actuating pressure P 20 and the valve spring 25 give the adjusting valve 20 a fail-safe property in the event of failure of the proportional adjusting device.
  • the adjusting device is a magnetic adjustment device, which is connected with a pulse-width-modulated electrical control signal.
  • the control signal is from a control device in the form of a rectangular signal with a constant upper and a constant lower signal level, such as voltage level, and a generated specific period t.
  • the pulse width modulation the time duration of the upper signal level, the so-called switch-on time, and subsequently the duration of the lower signal level, the switch-off time, can be varied accordingly.
  • the magnetic force of the adjusting device changes according to the duty cycle of the actuating signal, ie the ratio of the switch-on time to the period t.
  • the switching position of the adjusting valve 20 results from the equilibrium of forces of the force of the valve spring 25 and the two counteracting forces, namely the fluidic force generated by the valve actuating pressure P 20 and the magnetic force.
  • the larger the valve actuating pressure P 20 the smaller is the magnetic force corresponding to the balance of the forces. If the sum of fluidic force and magnetic force exceeds the spring force, the valve piston 22 moves in the direction of the first switching position, and the delivery volume of the positive displacement pump is stopped. If the force of the valve spring 25 predominates, the valve piston 22 moves to the second switching position, and the displacement unit 5-7 moves accordingly in the direction of maximum delivery volume.
  • the switch-on time and the switch-off time are assigned to the first and the second switch position of the adjustment valve 20.
  • the position of the valve piston 22 and, associated therewith, the switching position of the adjusting valve 20 are decoupled from the valve actuating pressure P 20 .
  • the adjusting valve 20 assumes the first switching position during each switch-on time, in which the fluid of the partial flow 16 is returned to the pressure chamber 8, and during each switch-off time assumes the second switch position, in which the fluid is returned to the pressure chamber 9.
  • the flow through the adjustment valve 20 to the respective pressure chamber 8 or 9 can be varied practically continuously in both embodiments because of the significantly shorter period duration t of the actuating signal compared to the relevant time constant of the pump. Accordingly, the pressure in the pressure 8 and the pressure in the pressure chamber 9 can be changed continuously.
  • the adjusting unit can be moved 5-7 along its axial displacement in any axial position and held there.
  • the delivery volume is thus flexibly and precisely continuously adapted to the fluid requirement of the unit 14 between the maximum and the minimum delivery volume.
  • a map in an electronic or optical memory contains for the relevant with regard to the fluid requirements operating conditions of the unit 14 each have a predetermined setpoint for the fluid supply pressure P 14 or the flow rate V 14 , which requires the unit 14 in the respective operating state.
  • These volume flow or pressure setpoints are stored in the map in dependence on physical quantities that characterize the operating conditions to be distinguished with regard to the fluid requirement. Examples of the physical variables are the temperature T, the speed D and the load L called.
  • the unit 14 has a detection device for detecting one or more of the different operating conditions characteristic physical quantity (s).
  • the temperature T can be measured, for example, at a critical point of the unit 14, in a cooling fluid serving to cool the unit 14, or in the fluid delivered by the pump 3.
  • the speed D can be detected very easily by means of a tachometer and the load L on the accelerator pedal or a throttle position.
  • the control device forms the actuating signal, namely the ratio of the switch-on time to the period t, in accordance with the current setpoint value.
  • a feedback by means of a control variable in this case a measured actual value of the fluid supply pressure P 14 or the volume flow V 14 , is not required, as long as the actual fluid requirement of the unit 14 corresponds to the desired value.
  • the control on the basis of the desired value can in particular be supplemented by a current control.
  • the current control is used in particular to compensate for changes in resistance of the magnetic adjustment device, as they can take place especially in temperature changes.
  • the current consumption of the adjusting device is detected by a detection device and kept at a specific current value. If, by means of the detection device, a change in the current consumption and accordingly of the electrical resistance of the adjusting device is detected, the duty cycle is changed in such a way that the current consumption again corresponds to the current value before the resistance change.
  • a regulating device is also provided for the adjustment valve 20.
  • the control device forms the control signal for the adjustment valve 20 as a function of a desired-actual comparison on the basis of a required for the unit 14 fluid supply pressure P 14 or flow V 14 .
  • the control device has access to a memory in which other setpoint values of the pressure P 14 or volumetric flow V 14 are stored in the form of a characteristic map comparable to the characteristic map previously used for the control.
  • the maps of the pressure setpoints or volume flow setpoints can be stored in physically different memories or in the same memory in different areas.
  • a higher-level control device which may be part of the pressure or volume flow control device or the control device and switches from the controller to a control, if it is determined that the demand of the unit has changed so much that the map of the setpoints does not adequately describe actual demand because demand has increased, for example due to wear.
  • the actual prevailing fluid supply pressure P 14 can be detected, for example, at the most downstream point of consumption of the unit 14 or in the example of the internal combustion engine at the motor gallery and compared with the relevant for the respective operating pressure target value, for example by subtraction of target and actual value.
  • non-feedback pressure or flow control can be further developed to a pressure or flow control with a target / actual comparison of the respective pressure or flow rate setpoint with an actual value to be measured for the comparison.
  • maps for the volume flow V 14 or fluid supply pressure P 14 can be stored in advance, which describe the need for different times in the life cycle of the unit 14, for example, a map for the first n kilometers of a motor vehicle or n operating hours of the unit 14, the next m mileage of the vehicle or m operating hours of the unit etc. On the basis of, for example, the mileage of the vehicle or an operating time detection can be converted in such embodiments of the first used map to the next, etc.
  • control device may also have the ability to change the setpoint values of the characteristic map in accordance with the state of the unit 14 in order to better adjust the adjustment valve 20 on the basis of the changed characteristic field to be able to control adapted to the respective state of the unit 14.
  • the change in the desired values of the characteristic map or the selection of one of several predetermined maps is advantageously carried out automatically, for example on the basis of the already mentioned mileage or the operating time or a detection of the fluid supply pressure P 14 and comparison with or predetermined in the form of a map pressure setpoint (s Although such a target / actual comparison could be used for a pressure control of the adjustment valve 20, but preferably only for the selection of the pressure or volume flow map to be used or the change in the pressure or flow rate setpoints of a single predetermined map is used for control.
  • FIG. 5 shows in a longitudinal section a modified with respect to the generation of the valve actuating pressure P 20 adjustment valve 20.
  • the valve actuating pressure P 20 is different than in the adjustment of the FIG. 4 not by means of an additional partial flow in the Figures 3 and 4 the partial flow 17, but by means of to be controlled or regulated flow of the partial flow 16.
  • Apart from this modification apply to the adjustment valve 20 of the Figures 3 and 4 made statements for the modified adjustment valve 20 and the comments made for this also for the adjustment valve 20 of the Figures 3 and 4 ,
  • the adjustment valve 20 has a valve housing 21 and a valve piston 22 axially movable in the valve housing 21 along a central valve axis S back and forth. From the adjusting device, a magnetic coil 27 and an anchor formed of soft iron 28 are shown.
  • the solenoid coil 27 is fixedly connected to the valve housing 21 and surrounds the armature 28.
  • the armature 28 is connected to the valve piston 22 axially immovable, so that the valve piston 22 and the armature 28 axial movements such as to execute a unit.
  • the valve piston 22 has a first active surface 23 and a second active surface 24 for the valve actuating pressure P 20 .
  • the active surfaces 23 and 24 define axially together a fluid space 26 and are facing each other axially.
  • the effective surface 23, to which the Valve set pressure P 20 of the valve spring 25 counteracts, is greater than the effective area 24, wherein in FIG. 5 the circumstances are exaggerated. In fact, the difference in size is only slightly, but defined so that the valve actuating pressure P 20 always exerts on the valve piston 22 a differential force corresponding to the size difference of the active surfaces 23 and 24, which counteracts the force of the valve spring 25.
  • valve piston 22 can be made very accurate to the size difference of the active surfaces 23 and 24, and the differential force correspondingly small and the valve spring 25 advantageously softer than in the embodiment of FIG. 4 be. Correspondingly low forces required the adjusting device 27, 28.
  • the adjustment valve 20 is more sensitive overall, and it can be the switching times of the adjustment valve 20 is shortened.
  • the switching position of the adjusting valve 4 in the Figures 3 and 4 corresponds, the port B opens into the fluid chamber 26, and the valve piston 22 separates the fluid chamber 26 and thus the inlet I of the other terminal A. Accordingly, the fluid of the partial flow 16 is returned to the pressure chamber 9, while the pressure chamber 8 via the port A connected to the reservoir 11 and thus connected without pressure.
  • the connection A is connected to the outlet O via a space of the valve housing 21, in which the valve spring 25 is arranged, and to the reservoir 11 via this.
  • the magnetic coil 27 is energized and shifts the armature 28 against the force of the valve spring 25 in the axial direction first in the middle switching position and with a correspondingly long switch-on until the other extreme switching position , the first switch position.
  • the valve piston 22 In the middle switching position, the valve piston 22 separates both ports A and B from the fluid chamber 26 into which the inlet I still opens.
  • the valve piston 22 In the first switching position, the valve piston 22 assumes such an axial position that the fluid space 26 is in axial overlap with both the inlet I and the port A, while the valve piston 22 in the respective axial position the port B of the fluid space 26th fluidly separates.
  • the fluid of the partial flow 16 is passed through the fluid space 26 and the port A in the pressure chamber 8, while the pressure chamber 9 via the port B and a passage C of the valve piston 22 to the outlet O and finally connected to the reservoir 11 is.
  • the valve piston 22 is hollow.
  • the passage C is formed in a cylindrical jacket region of the valve piston 22, which adjoins the active surface 24 in the direction of the armature 28 and forms a narrow sealing gap with the surrounding jacket of the valve housing 21, which fluidically displaces the adjusting device 27, 28 from the fluid space 26 separates.
  • a cylindrical jacket region of the valve piston 22, which forms a further narrow sealing gap with the valve housing 21, radially adjoins the active surface 23 and away from the adjusting device 27, 28, as long as the adjusting valve 20 does not assume the first switching position in which the valve piston 22 occupies the axial position in which the fluid space 26 is in axial overlap with the port A.
  • the adjusting device 27, 28 with the associated control device switches the adjustment valve 20 over the entire operating range of the unit 14 and controls or regulates the axial position of the adjustment 5-7 and consequently the delivery volume of the positive displacement pump over the entire volume flow range, for the adapted supply of the unit 14 is required.
  • the fluidic valve set pressure P 20 and the valve spring 25 serve as backup application in the event that the adjusting device 27, 28 or the associated control device fails due to a defect, for example due to a broken cable or a loose electrical connector.
  • the adjustment valve 20 is designed so that in the event of failure, the delivery volume of the pump from maximum towards minimum is adjusted only upon reaching a fluid supply pressure P 14 , which is greater than a maximum fluid supply pressure P 14 , which is established with proper function of the adjustment valve 20 ,
  • the valve spring 25 is installed with a biasing force which is greater than a force which exerts a maximum Ventilstelltik P 20 , which can be set with proper function, on the valve piston 22.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Sliding Valves (AREA)
  • Fluid-Driven Valves (AREA)
  • Multiple-Way Valves (AREA)
  • Magnetically Actuated Valves (AREA)
  • Safety Valves (AREA)
EP16206318.4A 2007-07-13 2008-07-09 Pompe volumétrique avec soupape de réglage du volume d'alimentation Active EP3173624B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200710033146 DE102007033146B4 (de) 2007-07-13 2007-07-13 Verstellventil für die Verstellung des Fördervolumens einer Verdrängerpumpe
EP08159994.6A EP2014919B2 (fr) 2007-07-13 2008-07-09 Soupape de réglage pour le réglage du volume d'alimentation d'une pompe volumétrique

Related Parent Applications (2)

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EP08159994.6A Division EP2014919B2 (fr) 2007-07-13 2008-07-09 Soupape de réglage pour le réglage du volume d'alimentation d'une pompe volumétrique
EP08159994.6A Division-Into EP2014919B2 (fr) 2007-07-13 2008-07-09 Soupape de réglage pour le réglage du volume d'alimentation d'une pompe volumétrique

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EP3173624A2 true EP3173624A2 (fr) 2017-05-31
EP3173624A3 EP3173624A3 (fr) 2017-06-21
EP3173624B1 EP3173624B1 (fr) 2022-01-26

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EP08159994.6A Not-in-force EP2014919B2 (fr) 2007-07-13 2008-07-09 Soupape de réglage pour le réglage du volume d'alimentation d'une pompe volumétrique

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Also Published As

Publication number Publication date
DE102007033146A1 (de) 2009-01-15
EP3173624A3 (fr) 2017-06-21
US8523535B2 (en) 2013-09-03
JP2009019773A (ja) 2009-01-29
EP2014919B2 (fr) 2020-01-08
US20090041605A1 (en) 2009-02-12
HUE035833T2 (en) 2018-05-28
EP2014919A3 (fr) 2010-09-01
EP2014919B1 (fr) 2017-01-04
DE102007033146B4 (de) 2012-02-02
EP3173624B1 (fr) 2022-01-26
EP2014919A2 (fr) 2009-01-14

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