EP4487353A1 - Verfahren zum bestimmen eines unteren stromschwellwerts eines strombandes einer magnetspule eines magnetventils für eine mit einem druckfluidspeicher fluidkommunizierenden ventileinheit, vorrichtung sowie fahrzeug - Google Patents
Verfahren zum bestimmen eines unteren stromschwellwerts eines strombandes einer magnetspule eines magnetventils für eine mit einem druckfluidspeicher fluidkommunizierenden ventileinheit, vorrichtung sowie fahrzeugInfo
- Publication number
- EP4487353A1 EP4487353A1 EP23700686.1A EP23700686A EP4487353A1 EP 4487353 A1 EP4487353 A1 EP 4487353A1 EP 23700686 A EP23700686 A EP 23700686A EP 4487353 A1 EP4487353 A1 EP 4487353A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- threshold value
- current threshold
- valve
- armature
- current
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
- H01F7/08—Electromagnets; Actuators including electromagnets with armatures
- H01F7/18—Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings
- H01F7/1844—Monitoring or fail-safe circuits
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
- H01F7/08—Electromagnets; Actuators including electromagnets with armatures
- H01F7/18—Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings
- H01F7/1805—Circuit arrangements for holding the operation of electromagnets or for holding the armature in attracted position with reduced energising current
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
- H01F7/08—Electromagnets; Actuators including electromagnets with armatures
- H01F7/16—Rectilinearly-movable armatures
- H01F2007/1684—Armature position measurement using coils
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
- H01F7/08—Electromagnets; Actuators including electromagnets with armatures
- H01F7/18—Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings
- H01F7/1844—Monitoring or fail-safe circuits
- H01F2007/185—Monitoring or fail-safe circuits with armature position measurement
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
- H01F7/08—Electromagnets; Actuators including electromagnets with armatures
- H01F7/18—Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings
- H01F7/1844—Monitoring or fail-safe circuits
- H01F2007/1861—Monitoring or fail-safe circuits using derivative of measured variable
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
- H01F7/08—Electromagnets; Actuators including electromagnets with armatures
- H01F7/18—Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings
- H01F2007/1888—Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings using pulse width modulation
Definitions
- multiple compressed gas tanks can be installed in the vehicle.
- These compressed gas tanks are each equipped with a multifunctional valve unit, the main function of which is to shut off the respective compressed gas tank when the vehicle is not in use.
- the valve units are usually equipped with a self-closing solenoid valve. If no current flows through a magnetic coil of the magnetic valve, the magnetic valve closes automatically, e.g. by spring force. This behavior is necessary for safety reasons, but has the disadvantage that current must flow through the magnetic coil continuously during ferry operation in order to keep the magnetic valve open. As a result, a small amount of electrical energy is permanently consumed.
- valve units or solenoid valves of the valve units are subject to technical tolerances, so that a current which has to flow through the solenoid coil in order to keep the solenoid valve open can vary.
- the present invention shows a method according to the features of claim 1, a device according to the features of claim 10, and a vehicle according to the features of claim 11.
- the present invention shows a method for determining (at least) a lower current threshold value of a current band of a magnetic coil of a magnetic valve for a fluid-communicating valve unit with a pressure fluid reservoir, in particular of a vehicle, with an electric current flowing through the magnetic coil at the level of the current band an armature of the magnet valve that can be moved by the magnet coil can be held in a fully open position, the movable armature comprising at least one state of motion when transferring between a closed position of the armature and the fully open position of the armature, and a state of rest in the fully open position.
- the method includes actively energizing the magnet coil of the magnet valve, the active energization of the magnet coil of the magnet valve being switched off when an electric current flowing through the magnet coil is detected at the level of an upper current threshold value of the current band.
- the method also includes, as a step, a renewed, active energizing of the magnetic coil of the magnetic valve by the electrical energy source when it is detected, in particular when it is detected that the electric current flowing through the magnetic coil has fallen below a definable, changeable current threshold value, which is lower than the upper one Current threshold is.
- one step of the method according to the invention is changing the level of the definable, variable current threshold value or changing the level of the definable, variable Current threshold and an (additional) changing the height of the upper current threshold.
- a further step of the method is a permanent measurement of a measurement signal, in particular a permanent measurement of a measurement signal and an evaluation of the measurement signal, to detect a change in the state of the armature of the solenoid valve between the at least one movement state and the rest state of the armature.
- the method includes as a step a determination of (at least) the lower current threshold value of the current band based on the definable, changeable current threshold value if the change in the state of the armature of the magnet valve due to the change in the definable, changeable current threshold value is detected, in particular (in advance of time) was detected .
- the method according to the invention and/or the device according to the invention for determining (at least) a lower current threshold value of a current band of a magnet coil of a magnet valve for a valve unit of a stationary energy unit that communicates fluidly with a pressurized fluid reservoir, e.g. a power generator or a fuel cell heating system, is used .
- valve unit can be fluidly connected or is connected to at least one pressurized fluid reservoir, for example of the vehicle or a stationary energy unit.
- a fully open position of the armature is to be understood in particular as a position of the armature in which the flow of a fluid through the valve unit, in particular through a fluid channel of the valve unit, is at a maximum.
- the armature of the solenoid valve In the fully open position, the armature of the solenoid valve is in the rest state, ie, at rest or substantially at rest.
- the armature of the solenoid valve can also be understood as a magnet armature.
- a state of movement of the armature is to be understood as a state of movement of the armature in which the armature moves, in particular along an axis of the armature, e.g. from the closed position to the fully open position. In other words, the armature is not at rest in the moving state.
- the closed position of the armature is to be understood in particular as a position of the armature in which the flow of a fluid through the valve unit, in particular through a fluid channel of the valve unit,
- the lower current threshold value is determined in particular based on this definable, changeable current threshold value in such a way that the movable armature at the lower current threshold value determined therefrom in the fully open position.
- the expression “based” in “the lower current threshold value is determined in particular based on this definable, changeable current threshold value” is intended to express in particular that this definable, changeable current threshold value is, for example, multiplied by a factor, or an offset is added, or, for example, the previous, definable, changeable current threshold value is used as the lower current threshold value.
- the active energizing of the magnetic coil of the magnetic valve, the switching off of the active energizing of the magnetic coil when the upper current threshold value of the current band is detected or detected, and when the definable, changeable current threshold value is recognized or detected, the renewed, active energizing of the magnetic coil is in particular a repeating process of the method according to the invention.
- the magnetic coil of the magnetic valve can be actively energized in a pulsating manner. A dynamic change in the inductance of the magnetic coil can thus be brought about when the armature starts to move.
- the electrical current flowing through the magnetic coil can have a periodic waveform, in particular a sawtooth-like or essentially sawtooth-like current waveform, or else a sinusoidal current waveform in the case of pulsating, active energizing.
- the pulsating, active energizing of the magnet coil of the magnet valve takes place in particular to determine the lower current threshold value by means of the method according to the invention (calibration mode).
- the magnetic coil of the magnetic valve can in particular also be actively energized in a pulsating manner during normal operation of the magnetic valve in order to (permanently) hold the movable armature of the magnetic valve in the fully open position.
- a mean current that is permissible for the magnet coil can be implemented in a particularly simple manner by the pulsating energization of the magnet coil of the magnet valve.
- the electrical energy for the active energizing can be provided by an electrochemical store, for example a battery in the vehicle.
- the active energizing of the magnetic coil of the magnetic valve can be switched on and off by actuating an electrical switch, for example a field effect transistor.
- the respective lower current threshold value of a current band required for holding a respective solenoid valve in a plurality of solenoid valves in the fully open position for keeping the respective solenoid valve open can be determined particularly easily and/or quickly and/or reliably.
- power consumption of a respective solenoid valve of the plurality of solenoid valves for example solenoid valves on hydrogen cylinders of a fuel cell vehicle, can be particularly advantageously low, preferably minimized.
- each solenoid valve is only supplied with the necessary, lower minimum electrical current (or lower minimum current intensity) of the current band.
- the lower current band current threshold for a solenoid coil is a lower minimum current band current threshold or a substantially lower minimum current band current threshold at which the armature of the solenoid valve can (barely) be held in the fully open position.
- the method according to the invention can also be used to determine the upper current threshold value, in particular as a function of the determined lower current threshold value.
- a power consumption of a respective solenoid valve of the plurality of solenoid valves for example Fuel cell vehicle, to (completely) keep open the respective armature to be particularly low, especially when the magnetic coils of the magnetic valves are pulsing in a normal operation of the magnetic valves, actively energized.
- the change in state of the armature between the moving state and the resting state of the armature can also be understood as a state transition. It can be advantageous if, in a method according to the invention, the state change of the armature is a change of the armature from the rest state to the movement state or a change of the armature from the movement state to the rest state.
- the definable, changeable current threshold value can be understood as a temporary lower current threshold value of the current band in order to be able to determine the lower current threshold value of the current band for normal operation of the solenoid valve.
- a freewheeling circuit connected in parallel with the magnet coil can be switched to be electrically conductive ("closed") at the same time or essentially at the same time, so that the electric current flowing through the magnet coil of the magnet valve can be reduced in a particularly advantageous manner due to the ohmic resistance of the magnet coil.
- the freewheeling circuit has, for example, a “freewheeling transistor” for electrically conductive switching of the freewheeling circuit.
- the freewheeling circuit is switched to be electrically non-conductive C, open") during the active energization of the magnet coil of the magnet valve.
- a device according to the invention can have such a freewheeling circuit.
- the time interval of the active energizing of the magnetic coil of the magnetic valve is in particular also referred to as the rise interval.
- the time interval from switching off the active energization of the magnetic coil when the upper current threshold has been detected until renewed active energization of the magnetic coil when the definable, changeable current threshold or the lower current threshold value has been recognized is in particular also referred to as the fall interval.
- the dropout interval may also be referred to as the freewheeling interval when a freewheeling circuit is employed.
- a device according to the invention can be designed to determine and, if necessary, adapt a particularly advantageous lower current threshold value and/or upper current threshold value at regular time intervals. In other words, self-calibration can take place.
- the method according to the invention makes use of the fact that when the armature changes its state between the moving state and the resting state, there is a change in the inductance of the magnet coil, since the inductance of the magnet coil depends, among other things, on the distance between the armature and the magnet coil.
- a movement of the armature can thus itself bring about a change in a current profile of the electrical current flowing through the magnet coil compared to the stationary armature.
- the change in the state of the armature of the solenoid valve between the at least one movement state and the rest state of the armature can be recognized or detected based on the change in the current profile.
- the change in the current flow can be used as an indicator of the movement of the armature.
- the height of the definable, changeable current threshold value is temporarily increased in steps and/or temporarily decreased in steps to change the height of the definable, changeable current threshold value for determining the lower current threshold value.
- a change in the state of the armature of the solenoid valve between the at least a state of movement and the state of rest of the armature are triggered in order to thus detect a movement of the armature.
- the upper current threshold value can also be increased stepwise at the same time for determining the lower current threshold value.
- the upper current threshold value can also be reduced stepwise at the same time for determining the lower current threshold value.
- the current band can in particular be shifted for determining the lower current threshold value.
- the lower current threshold value can thus be determined particularly quickly.
- the electric current flowing through the solenoid can be considered as the measurement signal.
- the course of the electric current flowing through the magnetic coil can be observed.
- the electric current flowing through the magnetic coil can be understood in particular as the electric current flowing directly through the magnetic coil.
- a current dependent on the electric current flowing through the magnetic coil is considered as the measurement signal.
- a time constant of the current flowing through the magnet coil of the magnet valve can advantageously be considered in a method according to the invention for detecting the change in the state of the armature.
- the decay of the electric current flowing through the magnetic coil after the electric current flowing through the magnetic coil has been switched off (when the upper current threshold value is detected) follows an exponential course.
- the time constant for the exponential curve can depend on the ratio of ohmic resistance, in particular ohmic resistance Magnetic coil and the inductance of the magnetic coil of the magnetic valve are determined. If the inductance decreases, e.g. because the armature detaches from the valve unit stop, the time constant of the exponential decay also decreases as a result.
- This time constant can be determined, for example, using a suitable filter routine, for example using a Taylor series.
- a current frequency of the current flowing through the magnet coil of the magnet valve can be considered with particular advantage in a method according to the invention for detecting the change in the state of the armature.
- the time can be determined that elapses between the active energization of the magnetic coil of the magnetic valve by the electrical energy source when an electric current flowing through the magnetic coil is detected at the level of a definable, changeable current threshold value and a renewed active energization of the when a through the Solenoid flowing, electric current passes in the amount of a definable, changeable current threshold.
- the period can be determined and considered, in particular the period of a sawtooth-like or essentially sawtooth-like current profile of the electric current flowing through the magnetic coil.
- the time constant of the exponential course of the electric current flowing through the magnet coil decreases, this leads to a time reduction in the decay interval, in particular the free-running interval.
- a change in the state of the armature between the state of rest and the state of movement can thus advantageously lead to a recognizable change in the current frequency.
- a frequency spectrum of the current flowing through the magnet coil of the magnet valve can be considered in a method according to the invention for detecting the change in the state of the armature.
- the course of the electric current flowing through the magnetic coil will show a strictly exponential behavior when the armature is stationary, whereas a movement of the armature will lead to a deviation from the exponential behavior. So can a change in the state of the armature between the state of rest and the state of movement advantageously lead to a recognizable change in the frequency spectrum of the current profile.
- the upper current threshold value of the current band can advantageously be adapted to the determined lower current threshold value of the current band of the solenoid valve.
- the energy consumption of a magnet coil that is actively energized in a pulsating manner during normal operation of the magnet valve can thus be particularly low.
- the upper current threshold value can be determined in such a way that a desired, average current value that is permissible for the magnet coil results.
- a value based on the measurement signal can be compared with a limit value with particular advantage.
- the limit value can also be understood as a threshold value.
- a classification method can be used in a method according to the invention for detecting the change in the state of the armature of the magnet valve.
- the classification method can be understood in particular as machine learning. Training data can be collected for this purpose. In particular, a statistical model is built using an algorithm that is based on the training data. Patterns and regularities in the training data can thus be recognized and unknown data can also be assessed.
- the present invention shows a device for determining (at least) a lower current threshold value of a current band of a magnet coil of a magnet valve for a valve unit that communicates fluidly with a pressurized fluid reservoir, in particular of a vehicle.
- the device has an electrical energy source for providing electrical energy for actively energizing the magnet coil of the magnet valve.
- the device also includes a sensor for detecting an electric current flowing through a magnetic coil of a magnetic valve.
- the device includes a control unit for switching off of the electric current flowing through the magnetic coil of the magnetic valve when an upper current threshold value of a current band of the magnetic valve is exceeded, and for actively energizing the magnetic coil of the magnetic valve when a definable, changeable current threshold value is undershot.
- the device also includes a current changing unit for changing the level of the definable, changeable current threshold value, and a measuring unit for measuring a measuring signal for detecting a change in the state of the armature of the solenoid valve between at least one movement state and one rest state of the armature.
- the device also has a determination unit for determining (at least) the lower current threshold value of the current band based on the definable, variable current threshold value if the change in the state of the armature of the magnet valve is detected due to the change in the definable, variable current threshold value.
- the device is designed to carry out a method according to the invention for determining at least the lower current threshold value of the current band for the magnet coil of the magnet valve of the valve unit of the pressure fluid reservoir, in particular of the vehicle.
- the valve unit has a housing for accommodating the solenoid valve.
- the valve unit has in particular a fluid inlet and a fluid outlet, wherein the fluid inlet can be fluidically connected to the fluid outlet by means of the solenoid valve via a fluid channel.
- the solenoid valve is also self-closing, i. H. if no current flows through a magnetic coil of the magnetic valve, the magnetic valve closes automatically, e.g. by spring force.
- the electrical energy source is in particular a battery, for example a vehicle battery.
- the sensor for detecting the electrical current flowing through the magnetic coil of the magnetic valve can be a current sensor, for example.
- the control unit is designed in particular to monitor the active energizing of the electric current flowing through the magnet coil of the magnet valve. and/or turn off. Furthermore, the control unit can additionally be designed to switch a freewheeling circuit to be electrically conductive and/or electrically non-conductive.
- the device can have a memory, in particular a non-volatile memory, for storing lower current threshold values and/or for storing upper current threshold values and/or for storing definable, changeable current threshold value(s).
- a memory in particular a non-volatile memory, for storing lower current threshold values and/or for storing upper current threshold values and/or for storing definable, changeable current threshold value(s).
- the device according to the invention is used to determine the lower current threshold value and/or the upper current threshold value of the current band of the magnet coil of the magnet valve for at least one valve unit that communicates fluidly with a pressurized fluid reservoir, e.g. a high-pressure hydrogen tank.
- a pressurized fluid reservoir e.g. a high-pressure hydrogen tank.
- the device according to the second aspect of the invention thus has the same advantages as have already been described for the method according to the first aspect of the invention.
- the present invention shows a vehicle, wherein the vehicle has at least one pressure fluid reservoir with a valve unit with a solenoid valve for controlling a flow of a pressure fluid that can be stored in the pressure fluid reservoir, in particular a plurality of pressure fluid reservoirs, each with a valve unit with a solenoid valve for controlling a flow a pressure fluid that can be stored in a respective pressure fluid reservoir of the plurality of pressure fluid reservoirs.
- the vehicle also includes a device designed according to the invention, the device also being designed to determine at least the lower current threshold value for the solenoid valve of the valve unit for the at least one pressure fluid reservoir.
- the device according to the invention is designed with several pressure fluid reservoirs to determine (at least) the lower current threshold value for the solenoid valve of the respective valve unit for at least two pressure fluid reservoirs of the plurality of pressure fluid reservoirs.
- the vehicle can also be understood as a stationary energy unit.
- the storable pressurized fluid can be gaseous hydrogen, for example.
- the pressurized fluid is stored under high pressure in the pressurized fluid reservoir.
- the valve unit is in particular arranged directly on the pressure fluid reservoir, for example a bottle neck of the pressure fluid reservoir.
- the valve unit can also be used as a system isolation valve unit or as a valve unit for a fuel cell system.
- the vehicle according to the third aspect of the invention thus has the same advantages as have already been described for the method according to the first aspect of the invention or the device according to the second aspect of the invention.
- Figure 1 schematically discloses a flow chart of a method for determining a lower current threshold value US or a lower current threshold value US and an upper current threshold value OS of a current band B (see, for example, Figure 3) of a magnet coil 2 of a magnet valve for a fluid-communicating with a pressurized fluid reservoir 21 Oa, 21 Ob valve unit 100, e.g. wherein the moveable armature includes at least one state of motion when transitioning between a closed position of the armature and the fully open position of the armature and a state of rest in the fully open position.
- the method for determining the lower current threshold value US or the lower current threshold value US and the upper current threshold value OS of the current band B also includes, as steps, in particular as repetitive steps, active energizing of the solenoid coil 2 of the solenoid valve, with the active energizing of the solenoid coil 2 of the solenoid valve upon detection of an electric current flowing through the magnet coil 2 in the amount of an upper current threshold value OS of the current band B is switched off, and renewed active energization of the magnet coil 2 of the magnet valve by the electrical energy source upon detection of an electric current flowing through the magnet coil 2 in Level of a definable, changeable current threshold value, which is lower than the upper current threshold value OS.
- a measurement signal e.g. the electric current flowing through the magnetic coil 2 is used to detect a change in the state of the armature of the magnetic valve between the at least a state of motion and the state of rest of the armature for the time of Determination of the lower current threshold value US or for the time of determination of the lower current threshold value US and the upper current threshold value OS continuously measured 20.
- the level of the definable, changeable current threshold value is now so frequent, in particular repeatedly, by one (current) step reduced 10 or lowered until the change in the state of the armature of the solenoid valve, here in this example a change in the state of the armature from the idle state to the moving state, is detected (positive) on the basis of the change in the definable, changeable current threshold value 30.
- the upper current threshold value is also successively changed, in particular also reduced or increased.
- the lower current threshold value US of current band B is determined 40 based on the definable, changeable current threshold value, with the upper current threshold value OS also being determined or adjusted can be.
- the upper current threshold value OS is adapted to the specific lower current threshold value US of the current band B of the solenoid valve.
- the previous, definable, changeable current threshold value can be determined as the lower current threshold value US of the current band B 40.
- the determined lower current threshold value US and/or the determined upper current threshold value OS are stored in a memory in one step 50.
- a time constant and/or a frequency spectrum and/or a current frequency of the current flowing through the magnet coil of the magnet valve can be considered for detecting the change in the state of the armature.
- the determination of the lower current threshold value US or the determination of the lower current threshold value US and the upper current threshold value OS are aborted 70 and an error memory entry is made 80.
- FIG. 2 discloses a device 220 for determining at least one lower current threshold value US or a lower current threshold value US and an upper current threshold value OS of a current band B of a magnet coil 2 of a magnet valve for a valve unit 100, e.g. see e.g. Figure 4).
- the device 220 has an electrical energy source 222, for example 12 volts - on-board voltage of the vehicle, for providing electrical energy for an active energizing of the magnetic coil 2 of the magnetic valve.
- the magnet coil 2 is represented in FIG. 2 by an ohmic resistor and an (electrical) coil.
- the device 220 includes an ammeter as a sensor 224 for detecting an electric current flowing through a magnetic coil 2 of a magnetic valve.
- the device 220 comprises a control unit 226 for switching off the electric current flowing through the magnetic coil 2 of the magnetic valve when an upper current threshold value OS of a current band B of the magnetic valve is exceeded, and for actively energizing the magnetic coil (2) of the magnetic valve when a definable, variable current threshold is undershot.
- the control unit 226 controls a field effect transistor 241 to switch off or switch on (active current supply) the electric current flowing through the magnetic coil 2 of the magnetic valve.
- a "freewheeling transistor" 242 connected in parallel with the solenoid coil 2 can be switched on, e.g.
- Device 220 also includes a current changing unit 228 for changing at least the level of the definable, changeable current threshold value and a measuring unit 230 for measuring and evaluating a measuring signal obtained by sensor 224 to detect a change in the state of the armature of the solenoid valve between at least a state of movement and a state of rest of the armature. To detect the change in the state of the armature of the solenoid valve, a value based on the measurement signal can be compared with a limit value, for example.
- Device 220 also includes a determination unit 232 for determining at least the lower current threshold value US of current band B based on the definable, changeable current threshold value, wherein device 220 is designed to use a method according to the invention for determining at least the lower current threshold value US of current band B for the magnet coil 2 of the solenoid valve.
- the sensor 224 and/or the current changing unit 228 and/or the measuring unit 230 and/or the determining unit 232 can also be part of the control unit 226 .
- Device 220 can also have a memory, in particular non-volatile memory, for storing lower current threshold values US and/or for storing upper current threshold values OS and/or for storing definable, changeable current threshold value(s).
- FIG. 3 reveals a sawtooth current profile of an electric current i m flowing through a magnet coil 2 of a magnet valve over time t.
- an armature of the magnetic valve that can be moved by the magnetic coil 2 can be Open position are held, while at the same time in a simple way an average permissible current for the magnetic coil can be realized without damaging the magnetic coil.
- Figure 4 reveals a time course of a (sawtooth-like) electric current i m flowing through a magnetic coil 2 before (see section (1)), during (see section (2)) and after (see section (3)) the determination of an (adapted ) lower current threshold value US by means of a method according to the invention or a device according to the invention 220.
- the current intensity i m , min denotes a lower minimum current threshold value of the current band B of the magnet coil 2 of the magnet valve at which the armature of the magnet valve can (just about) be held in the fully open position or is held becomes.
- properties of the solenoid valve can change, so that the lower current threshold value US used for the operation of the solenoid valve or the solenoid coil 2 and/or the upper current threshold value OS, ie the current band B, must be adjusted, so that the solenoid valve or a valve unit 100 can work particularly advantageously with such a solenoid valve and the energy consumption is particularly low.
- the lower current threshold value US of the current band B of the solenoid coil 2 of the solenoid valve is higher than the lower minimum current threshold value i m , min of the solenoid coil 2 of the solenoid valve, so that electrical energy is unnecessarily used to hold the armature of the solenoid valve in a fully open position is consumed.
- the height of the specifiable, changeable (lower) current threshold value is gradually reduced by means of the method or the device 220 according to the invention in order to change the height of the specifiable, changeable (lower) current threshold value for determining a (new, adapted) lower current threshold value US (see section (3) of the current curve).
- the upper current threshold value OS is also gradually reduced at the same time, in particular by the same value as the definable, changeable (lower) current threshold value US.
- section (2) of the current curve shown in Figure 4 the armature of the solenoid valve is released from a resting state in the fully open position when the definable, changeable (lower) current threshold value is less than the lower minimum current threshold value i m , min of the solenoid coil 2 of the solenoid valve is (see circle).
- the loosening of the armature is recognized as a change in the state of the armature and, based on the definable, changeable current threshold value at which the change in state of the armature is recognized, a new lower current threshold value US of the current band B and a new upper current threshold value OS are determined, determined in particular in such a way that when the solenoid coil 2 of the solenoid valve is energized with a current intensity equal to the current band B, the armature of the solenoid valve is held in the fully open position (see section (3) of the current curve shown in FIG. 4).
- the determined, adjusted lower current threshold value US in section (3) is greater than the definable, changeable (lower) current threshold value at which the state change of the armature was detected.
- FIG. 5 shows schematically a vehicle 200, the vehicle 200 comprising two pressurized fluid reservoirs 210a, 210b, each with a valve unit 100 with a solenoid valve for controlling a flow of a pressurized fluid that can be stored in the respective pressurized fluid reservoir 210a, 210b.
- Vehicle 200 also has a device 220 designed according to the invention, device 220 also being designed to determine at least the lower current threshold value US for the solenoid valve of the respective valve unit 100 for the two pressurized fluid reservoirs 210a, 210b.
- the respective lower current threshold value required for keeping the respective solenoid valve (completely) open can thus be determined by means of the method according to the invention.
- the vehicle 200 can also be understood as a stationary energy unit, for example a power generator or a fuel cell heating system.
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Magnetically Actuated Valves (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102022202189.4A DE102022202189A1 (de) | 2022-03-03 | 2022-03-03 | Verfahren zum Bestimmen eines unteren Stromschwellwerts eines Strombandes einer Magnetspule eines Magnetventils für eine mit einem Druckfluidspeicher fluidkommunizierenden Ventileinheit, Vorrichtung sowie Fahrzeug |
| PCT/EP2023/050454 WO2023165748A1 (de) | 2022-03-03 | 2023-01-10 | Verfahren zum bestimmen eines unteren stromschwellwerts eines strombandes einer magnetspule eines magnetventils für eine mit einem druckfluidspeicher fluidkommunizierenden ventileinheit, vorrichtung sowie fahrzeug |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP4487353A1 true EP4487353A1 (de) | 2025-01-08 |
| EP4487353B1 EP4487353B1 (de) | 2026-03-11 |
Family
ID=84982474
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP23700686.1A Active EP4487353B1 (de) | 2022-03-03 | 2023-01-10 | Verfahren zum bestimmen eines unteren stromschwellwerts eines strombandes einer magnetspule eines magnetventils für eine mit einem druckfluidspeicher fluidkommunizierenden ventileinheit, vorrichtung sowie fahrzeug |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP4487353B1 (de) |
| CN (1) | CN118830037A (de) |
| DE (1) | DE102022202189A1 (de) |
| WO (1) | WO2023165748A1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102024202183A1 (de) * | 2024-03-08 | 2025-09-11 | Hawe Hydraulik Se | Verfahren zum Implementieren eines datenbasierten Positionssensors für eine elektromagnetisch betätigte Komponente, Fluidventil und Fluidsystem |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19533452B4 (de) * | 1995-09-09 | 2005-02-17 | Fev Motorentechnik Gmbh | Verfahren zur Anpassung einer Steuerung für einen elektromagnetischen Aktuator |
| US7746620B2 (en) * | 2008-02-22 | 2010-06-29 | Baxter International Inc. | Medical fluid machine having solenoid control system with temperature compensation |
| DE102018209216A1 (de) * | 2018-06-11 | 2019-12-12 | Zf Friedrichshafen Ag | Positionsbestimmung für einen von einem Zweipunktregler bestromten Aktuator |
| EP3628902B1 (de) * | 2018-09-28 | 2022-06-22 | Tecan Trading Ag | Verfahren zur steuerung eines magnetventils und verfahren zum dispensieren oder aspierieren eines flussigkeitsvolumens sowie entsprechende dispensier-/pipettier-vorrichtung |
| DE102019217405A1 (de) * | 2019-11-12 | 2021-05-12 | Zf Friedrichshafen Ag | Verbesserte Steuerung eines elektromagnetischen Aktuators mittels einer Hystereselöschung und eines Zweipunktreglers |
-
2022
- 2022-03-03 DE DE102022202189.4A patent/DE102022202189A1/de active Pending
-
2023
- 2023-01-10 WO PCT/EP2023/050454 patent/WO2023165748A1/de not_active Ceased
- 2023-01-10 CN CN202380024856.XA patent/CN118830037A/zh active Pending
- 2023-01-10 EP EP23700686.1A patent/EP4487353B1/de active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN118830037A (zh) | 2024-10-22 |
| DE102022202189A1 (de) | 2023-09-07 |
| EP4487353B1 (de) | 2026-03-11 |
| WO2023165748A1 (de) | 2023-09-07 |
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