EP2542779A1 - Regelungsvorrichtung und verfahren zur regelung eines drehmoments einer triebwelle einer hydrostatischen maschine - Google Patents
Regelungsvorrichtung und verfahren zur regelung eines drehmoments einer triebwelle einer hydrostatischen maschineInfo
- Publication number
- EP2542779A1 EP2542779A1 EP11703821A EP11703821A EP2542779A1 EP 2542779 A1 EP2542779 A1 EP 2542779A1 EP 11703821 A EP11703821 A EP 11703821A EP 11703821 A EP11703821 A EP 11703821A EP 2542779 A1 EP2542779 A1 EP 2542779A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- control
- pressure
- force
- torque
- valve
- 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
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/26—Control
- F04B1/30—Control of machines or pumps with rotary cylinder blocks
- F04B1/32—Control of machines or pumps with rotary cylinder blocks by varying the relative positions of a swash plate and a cylinder block
- F04B1/328—Control of machines or pumps with rotary cylinder blocks by varying the relative positions of a swash plate and a cylinder block by changing the inclination of the axis of the cylinder barrel relative to the swash plate
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/08—Regulating by delivery pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/12—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by varying the length of stroke of the working members
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B2201/00—Pump parameters
- F04B2201/12—Parameters of driving or driven means
- F04B2201/1202—Torque on the axis
Definitions
- the invention relates to a control device and a method for controlling a torque of a drive shaft of a hydrostatic machine.
- a variable in its stroke volume hydrostatic machine is arranged in an open circuit.
- the hydrostatic machine can be driven in pump mode via a drive shaft
- Hydraulic fluid from a tank or a
- the hydrostatic machine is operated with pressure medium from the high-pressure accumulator as a motor and the
- the delivery or displacement volume of the hydrostatic machine should always be adjusted so that given a pressure of the high-pressure accumulator, a predeterminable braking or acceleration torque is present on the drive shaft of the hydrostatic machine.
- Torque of the shaft of the hydrostatic machine the high pressure of the high pressure accumulator is detected by a sensor and given to a control device.
- Control device calculated from a requested
- hydrostatic machine is adjusted by means of a control piston of a control device.
- the volume flows in and out of the actuator are on a
- Control valve set The control valve is this, so controlled by a control signal that at the hydrostatic machine sets the calculated delivery volume.
- a control signal that at the hydrostatic machine sets the calculated delivery volume.
- the object of the invention is to eliminate the disadvantages of the prior art.
- it is an object of the invention, a control method and a
- control device for controlling the present at the drive shaft of the hydrostatic machine torque that do not require the operation of a high pressure sensor and / or their functionality even in case of failure
- monitoring high-pressure sensor is further ensured.
- the method according to the invention regulates the torque of a drive shaft of a hydrostatic machine.
- Hydrostatic machine has an adjusting device for adjusting the stroke volume of the hydrostatic machine.
- the method comprises the following steps: First, a setpoint torque is specified and a set stroke volume of the hydrostatic machine is detected. to
- Control of the torque of the drive shaft is a
- volume flow in or out of the actuator by means regulated by a control valve.
- the volume flow is based on a force difference between a
- Control force and an opposite to the control force acting on the control valve acting force regulated.
- the acting force is generated by the pressure applied to the high pressure side of the hydrostatic machine high pressure and counteracts the control force.
- the size of the control force is set as a function of the detected stroke volume and the predetermined and detected setpoint torque.
- control device is a control device.
- the control device has a control valve for controlling a volume flow in or out of the
- Adjusting device e.g. a control pressure chamber of
- Actuator for adjusting the stroke volume.
- control device has a
- a target torque setting device for setting a target torque and a Hubvolumener upsetsvorraum for detecting a set stroke volume
- the volume flow through the control valve is adjustable with respect to the direction and preferably also the height on the basis of a force difference between a control force and a force acting in the opposite direction to the control valve force.
- a control surface of one side of the control valve is for
- the control device further has a control device which is suitable for specifying the magnitude of the control force as a function of the detected stroke volume and the predetermined setpoint torque.
- An advantage of the solution according to the invention is that the stroke volume of the hydrostatic machine automatically to the High pressure, which drives the hydrostatic machine or against which promotes the hydrostatic machine, is adjusted so that the target torque of the drive shaft of the hydrostatic machine remains virtually unchanged.
- Control force will automatically adjust the stroke volume to the
- preset setpoint torque is set by feedback of the currently set stroke volume of the hydrostatic machine.
- the pressure of the high pressure side goes through the direct admission of the control valve in the
- Control without having to measure the high pressure by vulnerable sensors.
- the target torque is given and the set stroke volume as a control variable easy to capture.
- such a control has the advantage that e.g. existing, pressure-controlled pumps by the control of the invention for torque control can be used.
- control force e.g. a spring force acting in the same direction with the control force on the control valve to simultaneously ensure a defined rest position of the control valve.
- the control force then consists of an adjustable component and a fixed
- Control force is generated by the setting of an opening pressure of a pressure relief valve.
- predetermined target torque generated to the detected displacement By such a ratio of given Target torque and the detected stroke volume a negative feedback of desired torque to displacement is achieved. Thereby, when the desired torque is changed, and thus when the control force is changed, it is achieved that the control force is adjusted in the opposite direction as a result of the resulting change in the stroke volume and the feedback of this stroke volume.
- the first mode of operation could be, for example, the pump mode and the second mode of operation could be the motor mode of the hydrostatic machine.
- an adjustable component of the control force for example the hydraulic component of the control force, in a first operating mode proportional to the ratio of the predefined setpoint torque to the detected stroke volume.
- control device is suitable for specifying the control force in a first operating mode proportional to the ratio of the preset setpoint torque to the detected displacement. So will at one
- Component of the control force in turn has two shares in a second mode of operation.
- the first share is indirectly proportional to the absolute amount of the
- Ratio of preset target torque to the recorded stroke volume depends on the difference between the setpoint torque and the actual torque of the drive shaft.
- the second portion is direct
- Control device is suitable, the control force
- Zero-stroke volume (defined here as the neutral position of the hydrostatic machine) towards a maximum
- hydrostatic machine for a given displacement and setpoint torque in engine operation is controlled only by the second, superimposed share on the exact adjusted stroke volume value of the hydrostatic motor.
- hydrostatic machine prevailing high pressure is determined. It is also advantageous to estimate the high pressure based on the control force or the adjustable component of the control force, for example, a hydraulic control pressure of the control force.
- the control device is suitable for the actual torque and the high pressure
- the actual torque can be calculated by the set stroke volume and the prevailing high pressure. Instead of the high pressure directly to
- control pressure which counteracts the high pressure on the control valve.
- the control pressure is directly proportional to that
- High pressure as the control signal always following the high pressure is regulated.
- the high pressure is estimated with a filtered control pressure.
- the control device is suitable, the
- control device is suitable for monitoring the control force or the control pressure of the hydraulic part of the control force on the basis of a high pressure measured with a pressure sensor.
- Attack direction of the control force and the opposing force on the control valve is reversed.
- this may e.g. be achieved by a shuttle valve.
- By such a reversal of the control direction in the second operating mode i.
- the engine operation of the hydrostatic machine can be the same in both operating modes
- Control system can be used for the control signal.
- the control signal and thus the predetermined control force is always direct
- control valve has a first connection connected to a high-pressure side of the hydrostatic machine, a second connection connected to a low-pressure accumulator or tank, and a third having a control pressure chamber
- the Control valve is preferably continuously between a first, the first port connecting to the third port position and a second, the second
- Control surface of the control valve is connected to a control pressure line and this component of the control force on the control pressure by the control device is adjustable.
- Control pressure line for adjusting the control pressure is connected to a pressure relief valve whose
- Opening pressure is adjustable by the control device. It is particularly easy and failsafe that
- Control force at least partially, for example, in addition to the additional component of a spring force through which
- control pressure line is connected via a throttle directly to the high pressure side of the hydrostatic machine.
- a control valve having a first and a second control surface and a shuttle valve, wherein in a first position of the shuttle valve, the first control surface of the control valve with the high pressure side of the hydrostatic machine and the second,
- control valve opposite acting control surface of the control valve is connected to the control pressure line.
- second control surface of the control valve is connected to the high pressure side of
- control device is suitable for
- Control algorithm can be maintained for the control force in the second operating mode as well as in the first operating mode. As described above in connection with the first mode of operation, is the predefined
- the control device is also for
- Power controller which adapt the torque of the drive shaft of a hydrostatic machine to the load pressure, advantageous.
- Fig. 1 is a schematic representation
- Fig. 2 is a simplified sectional view of the
- Fig. 3 is a block diagram of the control device of
- FIG. 4 is a diagram for explaining the generation of a control pressure generation signal
- Fig. 5A is a time chart of the target and actual torque of the drive shaft of the hydrostatic machine, which is controlled by the control method according to the invention
- FIG. 5B shows an associated time profile of the high pressure and the control pressure of a control valve
- Fig. 5C also a corresponding time course of the
- FIG. 6 shows a process flow diagram of the method according to the invention for controlling the torque of the shaft of the hydrostatic machine.
- Fig. 1 shows a regenerative drive system 1 according to a first embodiment.
- Drive system 1 has an axial piston machine 5, a high-pressure accumulator 3 and an inventive
- Control device for controlling a torque of a drive shaft 4 of an axial piston machine 5.
- the axial piston machine 5 is in an open circuit on a low pressure side via a first working line 6 with a tank volume 7 or alternatively with a
- the axial piston machine 5 is connectable to the high-pressure accumulator 3 on the high-pressure side via a second working line 8. This arrangement ensures that the second
- Working line 8 Always high-pressure in operation and the first working line 6 Always low-pressure in operation.
- Axial piston machine unit 2 has the adjustable Axial piston machine 5 as one in its stroke volume
- Adjusting device for adjusting the pivot angle of the axial piston machine 5 has in the first embodiment, two adjusting pistons 9 and 10, each in an actuating cylinder 11 and 12 in
- Fig. 2 shows in the illustrated step, only the second actuating piston 10 and the second actuating cylinder 12.
- the two adjusting pistons 9 and 10 are connected to the in the
- the axial piston machine 5 is of hers
- the swash plate 13 is adjustable from a minimum swivel angle of -18 ° to an absolute maximum same swivel angle of + 18 ° seen.
- Axial piston machine 5 has no stable zero position and is held by the spring force of a spring 17 in a pressureless state at maximum positive pivoting angle.
- the first actuating piston 9 and the first actuating cylinder 11 form a first actuating pressure chamber 14 and the second
- Control piston 10 and the second actuating cylinder 12 form a second actuating pressure chamber 15.
- an adjusting device with only one actuating piston, which limits two actuating pressure chambers in one actuating cylinder, could be used.
- the actuator could so
- the first and second control pressure chambers 14 and 15 of the first embodiment are each acted upon by a first and second control pressure line 23, 16 with a pressure.
- the second adjusting pressure chamber 15 is permanently connected via the second actuating pressure line 16 to the second working line 8. Therefore, in the second actuating pressure chamber 15 during operation of the axial piston machine 5, the pressure of the high pressure side acts.
- the second actuating piston 10 is acted upon in addition to a hydraulic force caused by the pressure in the second actuating chamber 15 by the rectified force of the spring 17.
- the axial piston machine unit 2 is provided with a
- Valve block 18 of the control device according to the invention connected.
- the valve block 18 has a control valve 19 for controlling the volume flow in and out of the first
- the control valve 19 is a 3/2-way valve. A first connection of the control valve 19 is connected via a first supply line 20 with a
- High pressure line 21 is connected, which is connected to the high pressure leading second working line 8.
- the first connection of the control valve 19 is thus with the high pressure side of the axial piston machine 5 and with the High-pressure accumulator 3 connected.
- the second connection of the control valve 19 is connected via a tank line 22 with the
- Tank volume 7 of the axial piston machine unit 2 connected.
- the third connection of the control valve 19 is connected via the first control pressure line 23 via a first throttle 24 to the first control pressure chamber 14.
- Throttle 24 limits the possible volume flow and thus the adjustment speed.
- a control valve piston of the control valve 19 can be brought into two end positions.
- the control valve 19 is continuously adjustable from the first end position to a second end position of the control piston. In the first end position, the first port is the third port of the
- Control valve 19 connected. In this position, the first actuating pressure chamber 14 is connected to the high-pressure leading first working line 8. In the second position, the second port is the third port
- Control valve 19 acts on a first hydraulic force and the second control surface of the control piston in
- a second hydraulic force as the first adjustable component of the control force.
- the first control surface is connected via a second supply line 29 to the high-pressure line 21, so that there always the high pressure of the second working line 8 acts.
- Control valve 19 acts on the force of a spring 25 adjustable in its bias of the control valve 19 plus the second hydraulic force as adjustable component.
- the second hydraulic force plus the spring force form the force acting on the second control surface of the control valve piston
- control valve 19 goes to the second position.
- the transmitted volume flow at given pressure conditions at the ports in the first and second position depends on the force difference between the first hydraulic force and the
- a third supply line 26 connects to generate the second hydraulic force, the second control surface of the control valve piston of the control valve 19 with a
- Control pressure line 27 The control pressure line 27 is connected via a second throttle 28 to the high pressure line 21st
- the first and the second supply line 20 and 29 are connected upstream of the second throttle 28 with the high-pressure line 21.
- control pressure line 27 is a
- Pressure relief valve 30 is arranged. On a
- Control surface of the pressure relief valve 30 acts a dependent of the control pressure as a first component of the control force third hydraulic force.
- the force of an adjustable in its bias spring 31 of the pressure relief valve 30 acts in the closing direction.
- Pressure relief valve 30 set opening pressure, so opens the pressure relief valve 30. So is the
- Control pressure in the control pressure line 27 upstream of the pressure relief valve 30 depending on the set opening pressure of the pressure relief valve 30 is set.
- This opening pressure is predetermined by the bias of the spring 31 of the pressure relief valve 30 and the opposing force of an electromagnet 32.
- the opening pressure and thus the set control pressure in the control pressure line 27 can be reduced by increasing the energization of the electromagnet 32.
- Control valve 19 is connected via a connecting line 33 to the tank line 22.
- the connecting line 33 has a third throttle 34.
- a check valve 35 for separating the high-pressure accumulator 3 from the high-pressure line 21, the second setting pressure chamber 15 and the axial piston machine 5 is arranged to prevent leakage.
- Shut-off valve 35 is for this purpose by energizing or non-energizing another solenoid 36 of the
- Lock valve 35 to open or close.
- the regenerative drive system 1 a further pressure relief valve 37, a Nachsaugventil 38 and a storage discharge valve 39.
- the further pressure relief valve 37 a further pressure relief valve 37, a Nachsaugventil 38 and a storage discharge valve 39.
- Pressure limiting valve 37 opens when exceeding a maximum allowable pressure through the high pressure in the second working line 8 to the tank volume 7 out.
- About the suction valve 38 is in the case of an empty
- the storage discharge valve 39 empties the high-pressure accumulator 3 as a result of an electrical discharge signal.
- the control device further includes
- Electromagnet 36 of the check valve 35 and a third control connection 43 is connected to the storage discharge valve 39. Furthermore, the control unit 40 via a fourth control connection 44 with a
- Target torque setting device 45 for example, connected to an accelerator pedal or a drive lever.
- the Sollcardmomentvorgabevorides 45 gives that at the
- Drive shaft 4 to be set torque as an electrical signal to the control unit 40.
- the torque to be set on the drive shaft 4 is also referred to below as the desired torque.
- the controller 40 is connected via a fifth control link 46 to a swing angle detector as a stroke volume detecting device.
- Swivel angle detector detects the set
- Axial piston machine 5 and outputs this as an electrical signal to the controller 40th
- the swivel angle detector is shown in Fig. 2 and designated there by "47.”
- the set swivel angle a is tapped on the second actuating piston 10 in the illustrated embodiment
- Control piston 10 a sensor element 48 of the
- Pivoting angle detector 47 mounted, which moves with the second actuating piston 10 in the longitudinal direction thereof. In the range of motion of the sensor element 48 is a
- Position detecting device 49 fixedly attached to the housing of the axial piston machine unit 2.
- Position detecting device 49 detects contactless the position of the sensor element 48 and thus the position of the second element connected to the sensor element 48
- the position detection device 49 converts the detected position of the second control piston 10 in a set the pivot angle a of
- FIG. 3 shows a block diagram of the control 50 of the control device according to the invention.
- the controller 50 has the swing angle detector 47, the
- the controller 40 includes a
- Operation mode detector 51 determines whether the
- Operating mode is located. This may be in the first one
- Embodiment for example, be determined from the sign of the swivel angle a or if the
- Swivel angle a to zero is the sign of the setpoint torque T to be set.
- Operating mode detector 51 is suitable to receive via the input 54 of the control unit 40, the pivot angle a and the input 55, a signal representing the target torque T signal.
- the operation mode detector 51 is connected to both control pressure command sections 52 and 53 and to a check valve control 62.
- Operation mode detector 51 is adapted to the target torque T and the pivot angle a to the first
- Axial piston machine 5 is in pumping operation or to give the second control pressure specification section 53 when the axial piston machine 5 is in engine operation.
- the operation mode detector 51 is adapted to notify the particular operation mode of the check valve controller 62, i. to drive the electromagnet 36.
- the first or second control pressure setting section 52 and 53 calculates a control pressure and converts the calculated control pressure into a control pressure signal including the control pressure signal
- the control pressure signal is applied to the output 56 of the controller 40 from either the first or the second control pressure setting section 52 or 53 and applied to the solenoid 32 via the first control connection 41.
- the control pressure signal (or the calculated, underlying control pressure) takes into account the proportion of the spring 25 to the control force. For simplicity, the force of the spring 25 is neglected below and only the adjustable component of the control force, so considered the control pressure.
- the first control pressure setting section 52 is at
- Operating mode detector 51 is active and calculates a
- Control pressure p which is directly proportional to the ratio of target torque T to pivot angle a.
- Control pressure p of the first control pressure setting section 52 is calculated to be
- the second control pressure specification step 53 is active in the second operating mode and described in more detail in FIG. 4.
- the output control signal is calculated from a first pressure component p x and a second pressure component p 2 .
- the first component p i is directly proportional to the absolute value of the ratio of the swivel angle a to the desired torque T. Should the moment T of the drive shaft be negative for the motor operation and positive for the pump operation, then the absolute value is also unnecessary, since in motor operation the tilt angle
- the first component p x is in a Vorsignalregelung 57 to
- K 2 is a second constant.
- the second component p 2 regulates the first component.
- a difference between the setpoint torque T and the actual torque 7 to is determined in a differential element 58, amplified in an amplifier 59 and added to the first component p x .
- control pressure p Since the control pressure p deviates from the high pressure briefly in the event of a rapid change in the setpoint torque T, the control pressure p in the correction device 61 undergoes filtering or smoothing before processing in the actual torque estimation 60.
- Correction device 61 may further or alternatively include logic used in borderline cases, e.g. when the actuator is at the stop, the control pressure p is correctly evaluated.
- the first component p of the control pressure p can also be controlled by more complex regulators, e.g. a PI controller, be readjusted.
- the control unit 40 also has the
- Lock valve control 62 which in the operation of the
- Block valve 35 energized via the second control connection 42 to the high-pressure accumulator 3 with the second
- Lock valve control 62 suitable to close the check valve 35 when the operation mode detector 51 detects neither a pump nor a motor operation and the
- Axial piston machine 5 is set to zero displacement.
- the controller 40 also includes a
- Emptying signal generator 63 for example, in the maintenance or repair case via the third control connection 43 can give a signal to the storage discharge valve 39 to empty the high-pressure accumulator 3.
- FIGS. 5A, 5B and 5C show an exemplary time course of essential quantities of FIG Control method of the regenerative drive system 1.
- Fig. 5A shows the time course of the target torque T as a solid curve as given for example by a driver and the actual torque T bl as a dashed curve.
- Fig. 5B shows the pressure-time diagram of the control pressure p as a solid line and the high pressure in the high-pressure accumulator 3 and at
- Working pressure line 8 as a dashed line. 5C shows the time course of the set and detected pivot angle a of the axial piston machine 5.
- the inventive method is based on the exemplary time course shown in FIG. 5 in connection with the method steps for regulating the torque on the drive shaft 4 of the axial piston machine 5 of FIG
- the axial piston machine 5 is set to the pivoting angle 0 °. This is realized, for example, by closing the check valve 35 and controlling the actuator by a state machine not shown in FIG. Since the check valve 35 is closed, there is no high pressure in the second working line 8.
- the high-pressure accumulator 3, however, is biased for example to 100 bar.
- the target torque setting device 45 outputs, in a first step Sl, a brake torque of the drive shaft 4, i. a positive setpoint torque.
- step S2 the standing at about 0 ° swivel angle of
- Operating mode detector 51 detects in a third
- Step S3 the operation mode. Since the swivel angle is almost 0 °, the operating mode of the
- the axial piston machine 5 is to be operated in pumping mode, ie in the first operating mode.
- the check valve 35 is energized to connect the high-pressure accumulator 3 now with the second working line 8 when a pump or engine operation is detected. Otherwise, in an idle state, when the axial piston machine 5 is at zero stroke volume or should be adjusted, the energization of the electromagnet 36 of the check valve 35 is interrupted.
- the operation mode detector 51 outputs the target torque T and the pivot angle a to the first control pressure setting section 52 when the
- Operation mode detector 51 the first operating mode
- the first control pressure setting section 52 sets a control pressure p in a step S5, which is proportional to the ratio of the target torque T and the swing angle ⁇ .
- the control pressure p is initially almost infinitely large due to the finite setpoint torque and almost vanishing pivot angle a in the denominator.
- the control pressure p is therefore limited and set to a predefined maximum value.
- the calculated control pressure p is converted into a control pressure signal and given to the output 56 of the controller 40.
- step S7 the control pressure signal via the first control connection 41 to the electromagnet 32 of the
- Opening pressure of the pressure limiting valve 30 is set to the calculated maximum control pressure.
- step S8 the volume flow into or out of the first control pressure chamber 14 the pressure conditions and thus the force difference on both sides of
- Control valve piston of the control valve 19 adapted. By the opening of the check valve 35 is located on the first side of the control valve piston of the high pressure of
- Opening pressure of the pressure limiting valve 30 is a maximum control pressure on the second side of the
- Actuator 11 is pressed and the axial piston machine 5 is adjusted in the direction of larger positive pivot angle, i. in the direction of larger production volume.
- control steps S1 to S5 or S6 are repeated as long as the control is in operation.
- a loop duration is much shorter than the adjustment of the
- Axial piston machine 5 e.g. 100 milliseconds and the
- the loop duration is an order of magnitude below the adjustment time of the
- Adjusting pressure chamber 14 adapted to the high pressure and the control pressure.
- Control pressure p is readjusted to the high pressure, so that there is a balance between the first hydraulic force and the control force.
- the predetermined setpoint torque T is steadily raised, so that the control pressure p remains greater than the high pressure.
- the setpoint torque T is set constant with about 120 Nm until time t ⁇ .
- the high pressure continues to increase during pumping. Due to the increasing high pressure in the high pressure line 21, the control valve 19 is moved in the direction of the first position and by a pressure medium flow into the first control pressure chamber 14 into the pivot angle a is reduced. Due to the constant adaptation of the pivot angle a to the increasing high pressure and the feedback of the changed pivot angle a, this steadily decreases.
- the control pressure p increases due to the further increasing setpoint torque T on.
- Control valve 19 moves in the direction of the second position and the first actuating pressure chamber 14 with the tank. 7
- the setpoint torque T is kept constant at about 330 Nm until the time ⁇ ⁇ .
- Control pressure p stabilizes at about 280 bar and the high pressure continues to rise until time t 6 until it reaches the control pressure p.
- the high pressure acting in the high pressure line 21 presses the control valve 19 in the direction of the first position and causes a volume flow in the first control pressure chamber. 1
- the swivel angle a is smaller, whereby the regulated in dependence of the swivel angle a control pressure p increases again and so the
- the control pressure p is controlled below the high pressure.
- the high pressure reaches the opening pressure of the pressure limiting valve 37, which is why the high pressure does not rise further despite the further pumping operation.
- the target torque is reduced more slowly.
- the swivel angle a also slows down to 0 °.
- the setpoint torque T reaches a minimum setpoint torque, below which no control of the torque of the drive shaft 4 takes place any more and the setpoint torque T is suddenly increased to zero.
- T are very small tilt angle a at the
- Axial piston machine 5 and small pivot angle a lead by the inverse relationship to very large control pressures. Therefore, the regulation for small target torques would tend to oscillate.
- the control is to absolute target torques T greater than one to limiting the minimum nominal torque.
- Such a minimum nominal torque could also be used to detect a rest position of the axial piston machine 5. At the time t 10 , the rest position is detected and the check valve 35 is closed. The swivel angle a is held at 0 ° by a state machine.
- Steps Sl to S4 the swivel angle a are detected, the setpoint torque is read in, the operating mode is established and the check valve 35 is opened.
- step S6 the second control pressure generation 53 calculates the control pressure p and outputs a control pressure p adjusting signal to the electromagnet 32 of the pressure relief valve 30.
- the predetermined acceleration torque results in the first portion p x of the control pressure to zero, since the pivot angle a is still is at zero and a second portion of the control pressure greater than zero, since the actual torque is still at zero and a target torque is less than zero specified. This reduces the
- Control pressure p and the axial piston machine 5 is in
- the target torque T is set constant until about the time t 13 at about -150 Nm. Due to the slowly falling high pressure, the control valve 19 is displaced in the direction of the second position and the first actuating pressure chamber 14 is connected to the tank 7. Thereupon, the swivel angle a changes in the direction of a smaller absorption volume, although the swivel angle a would have to be adjusted in the direction of the maximum absorption volume. By the readjustment of the control pressure p over the second portion p 2 , this is corrected and the pivot angle a in
- control pressure p is reduced, so that the control pressure p is set below the high pressure.
- the deviation between the control pressure p and the high pressure is greater in engine operation than in
- Torque T increases again and the proportion p of the control cam and thus the control pressure p decreases.
- the available high pressure is no longer sufficient to apply the target torque T and the
- the swivel angle a not fast enough to maximum displacement.
- the amount of the swivel angle a is increased until the axial piston machine 5 reaches the stop at maximum absorption volume at the time t 15 .
- the amount of the actual torque T bl drops and the control pressure p drops rapidly due to the large difference between the setpoint torque and the actual torque.
- the target torque T is slowly back to zero
- Pivoting angle a kept at 0 °.
- the axial piston machine 5 pivots via the spring force 17 via neutral into pumping operation.
- the then rebuilt pressure allows the use of the state machine.
- the invention is not limited to that described
- the first and the second operating mode could alternatively also by the
- inventive method and the control device according to the invention are not limited to the
- Torque is to be specified according to the invention.
- the invention is also applicable to power regulators, which are torque regulators per se, when a torque is to be specified.
- power regulators which are torque regulators per se, when a torque is to be specified.
- Pressure in the high-pressure accumulator can then occur the pressure caused by a hydraulic resistance, such as the load pressure in a load moved by a hydraulic cylinder or by a connected one
- Pressure relief valve specific pressure Furthermore, it is also possible to control hydrostatic machines whose high pressure side changes. Here only has to change the respective high pressure working line with a
- Control surface of the control valve 19 are connected.
- the first operating mode could also include the motor operation in the reverse direction of the shaft 4, if the hydrostatic machine, for example, in a
- Switching between the working lines could be done through a shuttle valve, which automatically opens a
- the second mode of operation could also be the Pumping operation in the reverse direction of the drive shaft 4 include.
- Such an embodiment would suggest that
- the invention finds in a start / stop automatic a particularly advantageous application.
- regenerative drive system 1 is given a starting torque to the control device according to the invention and the setting angle of the axial piston machine 5 is automatically set to the correct position for generating the
- a fan could be driven by an inventively controlled hydraulic motor, which is supplied from a pressure line with pressure medium.
- the pressure line is supplied by a constant motor and so a certain pressure, which can vary, maintained.
- Pressure line could still be connected to a hydraulic accumulator.
- the invention is applicable to all hydrostatic machines.
- the control of the control pressure can at each rest position of the actuator in the unpressurized state, such as a central rest position at a
- the occurrence of the disturbance variable can also be further processed and transmitted at an early point in time as information for a diesel engine as the drive motor of the regenerative drive system 1. This can happen, for example, via a bus connection.
- the diesel drive can adjust to the disturbance and it does not have the dead time to the occurrence of a
- a disturbance is, for example, a change in the
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102010010350 | 2010-03-05 | ||
| DE102010020004A DE102010020004A1 (de) | 2010-03-05 | 2010-05-10 | Regelungsvorrichtung und Verfahren zur Regelung eines Drehmoments einer Triebwelle einer hydrostatischen Maschine |
| PCT/EP2011/000339 WO2011107190A1 (de) | 2010-03-05 | 2011-01-26 | Regelungsvorrichtung und verfahren zur regelung eines drehmoments einer triebwelle einer hydrostatischen maschine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2542779A1 true EP2542779A1 (de) | 2013-01-09 |
| EP2542779B1 EP2542779B1 (de) | 2014-10-29 |
Family
ID=44503049
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP11703821.6A Not-in-force EP2542779B1 (de) | 2010-03-05 | 2011-01-26 | Regelungsvorrichtung und verfahren zur regelung eines drehmoments einer triebwelle einer hydrostatischen maschine |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP2542779B1 (de) |
| CN (1) | CN102782321B (de) |
| DE (1) | DE102010020004A1 (de) |
| WO (1) | WO2011107190A1 (de) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102012025201A1 (de) | 2012-12-27 | 2014-07-03 | Robert Bosch Gmbh | Hydraulikmaschine und ein regelverfahren zur regelung eines von einer hystaulikmaschine erzeugten drehmoments |
| JP2015140763A (ja) * | 2014-01-30 | 2015-08-03 | キャタピラー エス エー アール エル | エンジン・ポンプ制御装置および作業機械 |
| WO2015140622A1 (en) * | 2014-03-20 | 2015-09-24 | Danfoss Power Solutions Inc. | Electronic torque and pressure control for load sensing pumps |
| US11644027B2 (en) | 2014-03-20 | 2023-05-09 | Danfoss Power Solutions Inc. | Electronic torque and pressure control for load sensing pumps |
| DE102014212205A1 (de) * | 2014-06-25 | 2015-12-31 | Robert Bosch Gmbh | Verfahren zum Betreiben einer hydrostatischen Maschine |
| DE102014224337B4 (de) | 2014-11-28 | 2023-05-04 | Robert Bosch Gmbh | Verfahren zur Steuerung eines hydrostatischen Antriebs |
| DE102017208988A1 (de) | 2017-05-29 | 2018-11-29 | Robert Bosch Gmbh | Verfahren zur Steuerung eines hydrostatischen Antriebs |
| DE102018207158A1 (de) * | 2018-05-08 | 2019-11-14 | Robert Bosch Gmbh | Hydraulische Steueranordnung für eine Anordnung mobiler Arbeitsmaschinen und Anordnung mobiler Arbeitsmaschinen |
| DE102019206315A1 (de) * | 2019-05-03 | 2020-11-05 | Robert Bosch Gmbh | Verfahren und Regelschaltung zur Regelung einer Druckmittelzufuhr für einen hydraulischen Aktor |
| DE102019219451A1 (de) * | 2019-07-26 | 2021-01-28 | Robert Bosch Gmbh | Hydraulische Druckmittelversorgungsanordnung für eine mobile Arbeitsmaschine und Verfahren |
| DE102019219206A1 (de) | 2019-07-26 | 2021-01-28 | Robert Bosch Gmbh | Hydraulische Druckmittelversorgungsanordnung, Verfahren und mobile Arbeitsmaschine |
| CN112555236A (zh) * | 2020-11-30 | 2021-03-26 | 三一海洋重工有限公司 | 势能回收系统及其控制方法、工程设备 |
| DE102021200099A1 (de) | 2021-01-08 | 2022-07-14 | Robert Bosch Gesellschaft mit beschränkter Haftung | Verfahren zur Steuerung eines hydrostatischen Fahrantriebs |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1943356A1 (de) * | 1969-08-26 | 1971-03-18 | Rauch Fa Constantin | Einrichtung zur Regelung verstellbarer Axialkolbenpumpen |
| DE2419460A1 (de) * | 1974-04-23 | 1975-11-06 | Bosch Gmbh Robert | Einrichtung zur regelung einer pumpe |
| DE3221390A1 (de) * | 1982-06-05 | 1983-12-08 | Robert Bosch Gmbh, 7000 Stuttgart | Regeleinrichtung fuer eine pumpe |
| KR950013009B1 (ko) * | 1993-02-11 | 1995-10-24 | 대우중공업주식회사 | 가변용량형 유압피스톤 펌프의 유량제어장치 |
| DE4308198C1 (de) * | 1993-03-15 | 1994-07-28 | Rexroth Mannesmann Gmbh | Drehmomentregelung über Schwenkwinkel bzw. Exzentrizität bei hydrostatischen Maschinen mit axialer und radialer Kolbenanordnung |
| US7086225B2 (en) * | 2004-02-11 | 2006-08-08 | Haldex Hydraulics Corporation | Control valve supply for rotary hydraulic machine |
| DE102005037620A1 (de) * | 2005-08-09 | 2007-02-15 | Brueninghaus Hydromatik Gmbh | Regelvorrichtung für eine hydrostatische Kolbenmaschine mit elektronischer Steuereinheit |
| DE102006058357A1 (de) | 2006-12-11 | 2008-06-12 | Robert Bosch Gmbh | Vorrichtung zur Energierückgewinnung |
-
2010
- 2010-05-10 DE DE102010020004A patent/DE102010020004A1/de not_active Withdrawn
-
2011
- 2011-01-26 CN CN201180012348.7A patent/CN102782321B/zh not_active Expired - Fee Related
- 2011-01-26 EP EP11703821.6A patent/EP2542779B1/de not_active Not-in-force
- 2011-01-26 WO PCT/EP2011/000339 patent/WO2011107190A1/de not_active Ceased
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2011107190A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102782321A (zh) | 2012-11-14 |
| WO2011107190A1 (de) | 2011-09-09 |
| DE102010020004A1 (de) | 2011-09-08 |
| CN102782321B (zh) | 2015-08-19 |
| EP2542779B1 (de) | 2014-10-29 |
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