DE102021212305A1 - Electronic control unit for a hydraulic drive, hydraulic drive and method with a hydraulic drive - Google Patents

Abstract

Disclosed is an electronic control unit of a hydraulic drive or for a hydraulic drive, which has at least one power source and at least one user that can be supplied with a physical variable from it and has a priority assigned to it, wherein the control unit is set up to provide a quantity that can be provided by the at least one power source of the size and a quantity of the size requested by at least one participant or for this participant or to be determined. A hydraulic drive with such a control unit and a method with the drive are also disclosed.

Description

The invention relates to an electronic control unit for a hydraulic drive according to the preamble of patent claim 1, a hydraulic drive according to patent claim 11 and a method with a hydraulic drive according to patent claim 14.

A generic hydraulic drive has a power source, which is designed, for example, as an electric machine, a diesel engine, or as a hydraulic machine (hydraulic pump). Hybrid arrangements of the above are also conceivable as a power source. Power participants, short participants, are coupled to the power source. A widespread hydraulic drive in the field of mobile working machines has, for example, a diesel engine as the power source, one or more hydraulic pumps coupled to it and hydraulic driving or working actuators supplied by them.

A power sum requested by the participants is compared to the power that can be provided by the power source. If this is less than the sum of the requirements, the power consumption of the participants must be limited or at least prioritized.

In the case of conventional hydraulic drives with individually controlled mechanical-hydraulic participants, individual and thus decentralized controllers are used, which allow an individual limitation of the power consumption of a respective participant or consumer. In the case of a hydraulic machine, the controller is, for example, a valve assigned to it or a valve arrangement which acts on a manipulated variable of the hydraulic machine, in particular on its displacement volume, as a function of a hydraulically reported load pressure. An example is a flow rate controller with a superimposed pressure cut-off that limits the pressure. The fact that the participants are limited individually makes it difficult to implement power distribution and limitation across the entire drive.

In contrast, hydraulic drives with electronic control or regulation of the participants have the potential to centrally control and coordinate the power distribution and limitation.

In contrast, the present invention is based on the object of creating a control unit for a hydraulic drive, via which the power distribution or limitation is improved. Furthermore, the invention is based on the object of creating a hydraulic drive whose power distribution or power limitation is improved. Finally, the object of the invention is to create a method with a hydraulic drive, via which power distribution or limitation is improved.

The first of the objects is achieved by an electronic control unit with the features of patent claim 1, the second by a hydraulic drive with the features of patent claim 11 and the latter by a method with the features of patent claim 14. Advantageous refinements and developments of the respective invention are subject matter of the dependent claims.

An electronic control unit according to the invention is contained in a hydraulic drive or is provided for this. Said drive has at least one power source and at least one participant that can be supplied with a physical quantity by it. The at least one subscriber is in turn assigned a priority, in particular a priority with regard to an allocation of a quantity of a physical quantity that can be provided by the power source. The control unit is set up to read in or determine a quantity of the physical variable that can be provided by the at least one power source and a quantity of the variable requested by at least one user or for the user. According to the invention, the control unit is set up to determine a quantity of the size to be provided to the at least one user, specifically as a function of the quantity that can be provided by the power source, the quantity requested by the at least one user and its priority.

In particular, the control unit is set up to determine the quantity of the size to be provided solely as a function of the quantity that can be provided by the power source, the quantity requested by the at least one subscriber and its priority. In other words, it is set up to determine the quantity of the item to be provided without manually specifying a distribution key or distribution factor. Instead, a distribution key can be determined automatically or autonomously via the control unit depending on the quantities mentioned and the priority.

In other words, the hydraulic drive has at least one participant/consumer that is driven by a power source. A priority is assigned to the at least one participant. If there are several participants, they can be assigned different priorities, for example a low priority, a higher priority and a highest priority. Dependent on the electronic control unit according to the invention calculates/determines these assigned or predetermined priorities of the participants, the quantity of a physical quantity provided/available by the power source, preferably a power output, a torque or a pressure medium volume flow, and the quantity of the physical quantity requested/needed by the participants a quantity to be provided, possibly limited, of the size that is actually supplied to the respective participants. In particular, by limiting the quantity requested. In this case, the sum of the quantities to be provided to the participants is equal to the quantity of the physical quantity that can be provided by the at least one power source, so that the entire available quantity of this quantity is always utilized.

Thus, an electronic control unit for a hydraulic drive is provided, which implements a distribution or limitation function in order to divide a certain physical variable (e.g. power, torque or volume flow) between several consumers or participants (efficiency-efficient) so that the maximum possible utilization of the hydraulic drive is guaranteed. This ensures the best possible utilization of the physical quantity provided, without the power source being overloaded. Furthermore, the ratio of the quantities to be made available to the participants is equal to the ratio of the quantities requested (originally) by the participants, i.e. the ratio of the sizes remains unchanged after the determination/calculation by the electronic control unit.

The present invention therefore represents a solution with which the centralized or decentralized problems of quantity distribution, for example between consumers that are supplied with a quantity by a pump, or between several pumps that are driven by the same shaft, in electronic or electrified drive systems. the torque distribution between several consumers on a shaft and the power distribution between several consumers on a shaft or between several consumers in a complex system (e.g. diesel engine, electric batteries, electric motors, etc.), among which both mechanical and / or electrical power is divided supposed to eliminate.

In a further aspect of the invention, participants with the same priority are combined/divided/divided into priority groups.

For example, the priority groups are a low priority group, one or more higher priority groups, and a highest or exclusive priority group.

In a further aspect of the invention, the control unit determines a possible undersupply of the at least one subscriber and/or a possible overload of the at least one power source depending on the quantity that can be provided and the at least one requested quantity, in particular a sum of all requested quantities, the physical size.

In a further aspect of the invention, the control unit is set up, depending on the determined undersupply and/or overload, to determine a respective limiting factor for the priority groups and to limit or limit the quantities of the participants in these priority groups to be provided via the respective limiting factor.

In other words, the control unit calculates a limiting factor or limiting factor as a function of the priority groups of the participants, with which the quantity to be provided for the participants in the respective priority groups is then calculated. The determined limiting factor can be the same or different for a number of priority groups.

In a further aspect of the invention, the control unit is set up to determine the quantity to be provided to the respective participant depending on his (original) requested quantity, a sum of the requested quantities of the participants of the same priority or priority group and a quantity available for the participants of the same priority or priority group .

$$fa{c}_{Priox}=\frac{X_{avail\_Priox}}{X_{dem\_Priox}}$$

In other words, the calculation of the limitation factor, as well as the quantity of the physical quantity to be provided to the respective participant, reduced if necessary, is carried out using the formulas: $$X_{\mathrm{i.e}em\_\mathrm{right}e\mathrm{i.e}\_i}=X_{\mathrm{i.e}em\_i}\cdot fa{c}_{P\mathrm{right}iOx}$$

$$fa{c}_{P\mathrm{right}iOx}=\frac{X_{avail\_P\mathrm{right}iOx}}{X_{\mathrm{i.e}em\_P\mathrm{right}iOx}}$$

X _{dem_red_i} is the quantity to be made available to the respective participant i, possibly reduced, X _{dem_i} is the quantity requested by the respective participant i, fac _Priox is the limiting factor of the priority group x, X _{avail_Priox} is the quantity available/providable for the participants in the priority group x and X _{dem_Priox} the sum of the quantity requested by all participants of the priority group x (originally). All subscribers in the same priority group x are thus assigned the same limiting factor fac _Priox . In this way, in the event of undersupply or overload, all participants in the same priority group x experience the same proportional slowdown or limitation.

In a further aspect of the invention, the control unit is set up such that the at least one participant is assigned an individual minimum limit or minimum threshold for the quantity to be provided to him, which is only fallen below when the requested quantity of all other participants of the same priority or priority group falls to their respective minimum limit has been limited. This minimum limit, which is especially parameterized for the participants, ensures that a standstill of the participants in this priority group is delayed as long as possible.

In a further aspect of the invention, the control unit is set up so that, in the event that the quantity that can be provided is not sufficient to meet the minimum limits, the quantities to be provided to the participants are reduced towards zero at the same time, depending on the quantities they have requested, in particular until this reach zero.

In other words, the quantity to be provided to the respective participants only falls below the minimum limits of the respective participants if the quantity that can be provided by the at least one power source, i.e. the available quantity of the physical variable, is not large enough to meet the minimum limits of all participants fulfill. The quantity to be provided to the respective participants is simultaneously reduced towards zero, in proportion to the quantity they (originally) requested.

In a further aspect of the invention, the control unit is set up so that if the hydraulic drive has participants from at least two different priority groups, none of which is a highest, i.e. exclusive, priority group, the control unit selects the participants from the higher Priority group requested quantity is limited only after the quantity requested by the participants of the low priority group has been limited to its minimum limit.

In a further aspect of the invention, the control unit is set up so that if the hydraulic drive has participants from the highest priority group, the control unit sends the participants of the remaining priority groups, i.e. the priority groups, which have a lower priority than that of the highest priority group have, the quantity to be provided is reduced to zero if only the quantity requested by the participants in the highest priority group can be covered/fulfilled by the quantity that can be provided.

This ensures that the subscribers from the highest or most important priority group are supplied with the full/unrestricted quantity to be provided, i.e. the quantity of the physical variable originally requested by them, for as long as possible.

In a further aspect of the invention, the control unit is set up such that the individual minimum limit and/or the assigned priority of the at least one participant can be changed. In other words, the individual minimum limit of the participants and/or the priority group of the respective participants, which influence the distribution/allocation of the quantity of the physical variable that can be provided, can be set or changed, for example by manual input by operating personnel. In this way, for example, the priority of the various participants can be adapted to the wishes of the operating personnel.

The invention also relates to a hydraulic drive with at least one power source, at least one user that can be supplied with a physical variable from this and has a priority assigned to it, and a control unit according to the invention, which is signal-connected to at least the power source and the at least one user.

In a further aspect of the invention, the power source of the hydraulic drive is a drive machine with a drive shaft, in particular an electric machine or an internal combustion engine, and the participants are at least one primary unit coupled to the drive shaft, in particular a hydraulic machine or hydraulic pump, and at least one with this in hydraulic Circuit arranged hydraulic secondary unit, in particular a hydraulic machine or a hydraulic motor or a hydraulic cylinder. In other words, the subscribers can be arranged in different levels, for example in series, with a power conversion in particular taking place from level to level.

In a further aspect of the invention, the drive has a further participant, which is designed as an electric machine and is coupled to the drive shaft of the power source.

In one variant, the power source is formed by a hydraulic primary unit, in particular in the form of a hydraulic machine or hydraulic pump, and the participants are formed with this in the hydraulic circuit as hydraulic secondary units, in particular as a hydraulic machine and/or hydraulic cylinder.

The two variants are intended to make it clear that the distribution and limitation according to the invention is independent of the topology of the hydraulic drive. In other words, the inventive determination of the quantity to be made available for the respective participant may or may not include the drive machine.

The invention further relates to a method with a hydraulic drive, which has at least one power source and at least one subscriber that can be supplied with a physical variable and has a priority assigned to it. The method includes the steps of reading in or determining a quantity of the physical variable that can be provided by the at least one power source, via a control unit of the drive, and reading in or determining a quantity of the physical variable requested by at least one participant or for this participant, via the control unit. According to the invention, the method has the step of determining, via the control unit, a quantity of the physical variable to be provided to the at least one subscriber as a function of the quantity that can be provided, its requested quantity and its priority.

• 1 eine elektronische Steuereinheit mit Eingangsgrößen und Ausgangsgrößen in schematischer Darstellung, gemäß einem Ausführungsbeispiel,
• 2 einen hydraulischen Antrieb mit einer Leistungsquelle, zwei Teilnehmern und einer elektronischen Steuereinheit in schematischer Darstellung, gemäß einem Ausführungsbeispiel,
• 3 ein Verfahren mit einem Antrieb mit mehreren Teilnehmern aus drei unterschiedlichen Prioritätsgruppen, gemäß einem Ausführungsbeispiel,
• 4 eine schematische Darstellung verschiedener Fälle von Versorgung und Unterversorgung, welche bei einer Ermittlung einer bereitzustellenden Quantität einer Leistung auftreten,
• 5 eine Zuordnung unterschiedlicher prioritätsgruppenabhängiger Begrenzungsfaktoren gemäß den Fällen aus 4 mit zugehörigen Berechnungsformeln, und
• 6 einen hydraulischen Antrieb mit einer Leistungsquelle, mehreren Teilnehmern und einer elektronischen Steuereinheit in schematischer Darstellung, gemäß einem weiteren Ausführungsbeispiel.

The invention will now be explained in more detail using advantageous embodiments and with reference to the associated figures. The figures are only of a schematic nature and serve exclusively to understand the invention. Show it:

• 1 an electronic control unit with input variables and output variables in a schematic representation, according to an embodiment,
• 2 a hydraulic drive with a power source, two participants and an electronic control unit in a schematic representation, according to an embodiment,
• 3 a method with a drive with several participants from three different priority groups, according to an embodiment,
• 4 a schematic representation of various cases of supply and undersupply, which occur when determining a quantity of a service to be provided,
• 5 an assignment of different priority group dependent limiting factors according to the cases 4 with associated calculation formulas, and
• 6 a hydraulic drive with a power source, multiple participants and an electronic control unit in a schematic representation, according to a further embodiment.

1 shows an electronic control unit 1 according to an embodiment with one of at least one power source (cf 2 and 6 ) available quantity X _{avail_n} and one of at least one participant (compare 2 and 6 ) requested quantity X _{dem_i} of a physical quantity X, in particular a power, a torque or a pressure medium volume flow, as input quantities, and with a quantity X _{dem_red_i} of the physical quantity X to be provided to the at least one participant as an output quantity. The electronic control unit 1 reads in the values of the quantity X _{avail_n} that can be made available and of the requested quantity X _{dem_i} or can determine these values using detected variables. In the case of several power sources, each of which makes available a quantity X _{avail_n} that can be provided, the control unit 1 adds up these quantities X _{avail_n} . The control unit 1 then calculates the quantity X _{dem_red_i} of the physical variable X to be provided to the respective participants from the input variables using a distribution function and/or limiting function, so that the best possible utilization of the quantity X _{avail_n} that can be provided is ensured without overloading the at least one power source.

2 shows a hydraulic drive 3 in a schematic representation according to an embodiment. He has a power source 4, two participants 5, 6 and an electronic control unit 1 according to 1 . The power source 4, in particular its control unit (not shown), transfers information about the quantity X _avail of the physical variable X that can be provided by it to the control unit 1, which, using this information, the quantities X _{dem_1} and requested by the two participants 5, 6 X _{dem_2} and the integrated distribution function determines the limited control signals 8, 9 for the two participants 5, 6. These limited control signals 8, 9 restrict or limit the quantities X _{dem_1} , X _{dem_2} requested by the participants 5, 6 to the quantities X _{dem_red_1} and X _{dem_red_2} to be made available to the participants 5, 6 .

The drive 3 according to 2 can have, for example, a diesel engine as power source 4 and two hydraulic pumps as participants 5,6. In this case, for example, a die The quantity of power that can be provided by the motor (physical variable X is the power) is determined via a CAN (Controller Area Network) and passed on to the control unit 1, which then, depending on this and the power required by the hydraulic pumps, divides the quantity of power that can be provided on the two Hydraulic pumps 5, 6 divided / distributed. In one variant, the drive 3 has a hydraulic pump as a power source 4 and two hydraulic consumers as participants 5, 6. In such a case, a pressure medium volume flow that can be provided by the hydraulic pump 4 (physical variable X is the pressure medium volume flow in this case) can be output via the control unit 1 a speed detected or known from a controller and a pivot angle of the hydraulic pump 4 detected or known from a controller. The control unit 1 then determines the volume flow that can be provided as a function of the pressure medium volume flow that can be provided and the pressure medium volume flows requested by the consumers 5, 6 and distributes it to the consumers 5, 6.

3 shows a method according to the invention with a sequence of limitation stages, as can occur with increasing undersupply, that is to say with a decreasing quantity of the physical variable X that can be provided. Shown is the decrease in the quantity of the physical quantity X to be provided, in this example a service P, for several participants from three different priority groups Prio0, Prio1 and Prio2. In 3 is the power requested by the participants as the height of the bordered boxes, i.e. plotted on the y-axis, while the participants are divided into the three different priority groups Prio0, Prio1, Prio2 via the x-axis. The power requested by all the participants is P _dem Σ. A service requested by the participants in a lower priority group Prio0 is P _{dem_Prio0} , a service requested by the participants in a higher priority group Prio1 is P _{dem_Prio1} and a service requested by the participants in a highest priority group Prio2 is P _{dem_Prio2} . On the left of the 3 the case is shown in which the power P _avail that can be provided by the power source is sufficient to supply all participants in the priority groups Prio0, Prio1 and Prio 2 with power. This means that the service that can be provided P _avail is greater than or equal to the value of the requested services P _dern Σ of all participants.

In the event that the available power P _avail is less than the requested power P _dem Σ of all participants, the ones on the right side of the 3 power limitation shown from left to right (level 1 to level 4). In this case, the next/higher stage is only run through if the available power quantity P _avail is still not sufficient to supply the participants in all priority groups Prio0, Prio1 and Prio2 with the reduced, newly requested power P _dem Σ.

According to 3 in a first stage (second diagram from the left), the requested services P _{dem_} P _rio0 of all participants in the lowest priority group Prio0 are reduced to the respective minimum limits P _{dem Min} (dashed line) of these participants. The limitation of the requested services of all participants of the priority group Prio0 takes place with a uniform limitation factor for the priority group. Meanwhile, the participants in the priority groups Prio1 and Prio2 continue to be supplied with unlimited/restricted power.

If the limitation of the requested performance variables in the first stage is not sufficient, according to 3 the second stage (third diagram from the left) initiated.

In this, the services P _{dem_Prio1} requested by all participants in the higher priority group Prio1 are also reduced in the direction of their respective minimum limits P _{dem Min} (dashed line). The participants in the priority group Prio0 continue to be supplied according to their minimum limit P _{dem Min} , while the participants in the highest priority group Prio2 continue to be supplied without restrictions.

In the third stage (fourth diagram from the left), the services P _{dem_Prio0} , P _{dem_Prio1} requested by all participants in the priority groups Prio0 and Prio1 are reduced by the same limiting factor below their respective minimum limits P _demMin , in other words, there is a "social" reduction in the requested services P _{dem_Prio0} , P _{dem_Prio1} towards zero. The participants in the priority group Prio2 will continue to be supplied without restrictions.

In the last, fourth stage (right diagram), the services P _{dem_Prio0} , P _{dem_Prio1} requested by all participants in the priority groups Prio0 and Prio1 have already been reduced to zero, which is why in this last step the services P _{dem_Prio2} requested by all participants in the highest priority group Prio2 be limited with a new limitation factor, which is the same factor for all participants of this priority group Prio2.

4 shows various cases I - VI, which occur when determining the quantity to be provided of a physical quantity X, in this example the service P. The of the participants of the priority groups Prio0, Prio1, Prio2 requested services P _{dem_Prio0} , P _{dem_Prio1} , P _{dem_Prio2} are in 4 stacked on the right, arranged in a single bar of a bar chart. Accordingly, the total required power of all participants P is plotted _against Σ on the y-axis. The reduction of the requested services P _{dem_Prio0} , P _{dem_Prio1} , P _{dem_Prio2} are sequential, in this 4 from top to bottom, according to the levels 3 run through. The different cases I - VI occur, depending on the size of the power P _avail that can be provided.

The different cases for an activation logic of the control unit 1 are described in more detail below. In case I according to 4 there is enough power P _avail for the requirements of all participants in the priority groups Prio0, Prio1, Prio2, which is why there is no restriction or limitation. In case II there are also participants from the priority groups Prio0, Prio1, Prio2. In contrast to this, in case III there are only participants from the two priority groups Prio0 and Prio2. In both cases II and III there is not enough power to meet the requirements of all participants in priority groups Prio0, Prio1, Prio2 (for case II) and all participants in priority groups Prio0 and Prio2 (for case III). Consequently, the requirements of the participants from the priority group Prio0 are reduced in both cases, but only until at least the minimum limits P _{dem Min} of the participants from the priority group Prio0 are still met. In case IV there is only enough power to meet the requirements of the participants from priority group Prio2 and the minimum limits P _{dem Min} of all participants from priority groups Prio0 and Prio1. The requirements of the participants from the priority group Prio1 are thus also reduced, and only until at least the minimum limits P _{dem Min} of the participants from this priority group Prio1 are still met. In case V there is only enough power to meet the requirements of all participants in the highest priority group Prio2. As a result, the requirements of the participants from the priority groups Prio0 and Prio1 are reduced below their respective minimum limits P _{dem Min} in the direction of zero and possibly down to zero. In case VI, there is also not enough power to meet the requirements of the participants from priority group Prio2, which is why the requirements of this priority group are also reduced.

das heißt der Begrenzungsfaktor fac_Priox für eine Prioritätsgruppe Priox ist der Quotient aus der den Teilnehmern der Prioritätsgruppe Priox bereitstellbaren Leistung P_{avail_Priox} durch die von den Teilnehmern der Prioritätsgruppe Priox angeforderte Leistung P_{dem_Priox}. Für den Fall I weisen alle Begrenzungsfaktoren fac_Prio0, fac_Prio1, fac_Prio2 den Wert 1 auf, da die bereitstellbare Leistung P_avail größer oder gleich der gesamten angeforderten Leistung P_demΣ ist und somit keine Reduzierung stattfinden muss. Für den Fall II wird der Begrenzungsfaktor fac_Prio0 für die Teilnehmer der Prioritätsgruppe Prio0 über die Formel $\frac{P_{avail}-P_{dem\_Prio1}-P_{dem\_Prio2}}{P_{dem\_Prio0}}$

berechnet. Die Begrenzungsfaktoren fac_Prio1, fac_Prio2 für die Prioritätsgruppen Prio1 und Prio2 haben jeweils den Wert 1. Im Fall III wird der Begrenzungsfaktor fac_Prio0 mit derselben Formel wie in Fall II errechnet und die Begrenzungsfaktoren fac_Prio1, fac_Prio2 haben jeweils den Wert 0 und 1. Für den Fall IV wird der Begrenzungsfaktor fac_Prio0 über die Formel $\frac{P_{dem\_Prio0\_Min}}{P_{dem\_prio0}}$

errechnet. Der Wert P_{dem_Prio0_Min} entspricht dabei der für die Teilnehmer der Prioritätsgruppe Prio0 bereitstellbaren Leistung, da diese Mindestgrenze erfüllt werden muss. In diesem Fall wird der Begrenzungsfaktor fac_Prio1 über die Formel $\frac{P_{avail}-P_{dem\_Prio2}-P_{dem\_Prio0\_Min}}{P_{dem\_Prio1}}$

berechnet und der Begrenzungsfaktor fac_Prio2 hat den Wert 1. Die Begrenzungsfaktoren fac_Prio0 und fac_Prio1 berechnen sich für den Fall V über die Formel $\frac{P_{avail}-P_{dem\_Prio2}}{P_{dem\_Prio0+}{P}_{dem\_Prio1}}$

während der Begrenzungsfaktor fac_Prio2 den Wert 1 hat. Im letzten Fall VI betragen die Werte der Begrenzungsfaktoren fac_Prio0 und fac_Prio1 null und die von den Teilnehmern der höchsten Prioritätsgruppe Prio2 angeforderten Leistungen werden über den Begrenzungsfaktor ${\text{fac}}_{\text{Prio2}}=\frac{P_{avail}}{P_{dem\_prio2}}$

reduziert. 5 shows an assignment of different priority group-dependent limiting factors fac _Prio0 , fac _Prio1 , fac _Prio2 according to the different cases 4 with their associated calculation formulas. Depending on their priority group Prio0, Prio1 or Prio2, the services P _{dem_i} requested by the respective participants are multiplied by the corresponding limiting factors fac _Prio0 , fac _Prio1 or fac _Prio2 in order to calculate the (actual) power P _{reduced_i} to be provided, with which the respective participants be taken care of. The general formula for calculating the limiting factors for a power quantity is $fa{c}_{P\mathrm{right}iOx}=\frac{P_{avail\_P\mathrm{right}iOx}}{P_{\mathrm{i.e}em\_P\mathrm{right}iOx}},$

This means that the limiting factor fac _Priox for a priority group Priox is the quotient of the service P _{avail_Priox} that can be made available to the participants in the priority group Priox divided by the service P _{dem_Priox} requested by the participants in the priority group Priox. For case I, all limiting factors fac _Prio0 , fac _Prio1 , fac _Prio2 have the value 1, since the power that can be made available P _avail is greater than or equal to the total power required P _dem Σ and therefore no reduction has to take place. For case II, the limiting factor fac _Prio0 for the participants in priority group Prio0 is calculated using the formula $\frac{P_{avail}-P_{\mathrm{i.e}em\_P\mathrm{<figure-callout\; id="1"\; label="right\; i\; O"\; filenames="DE102021212305A1\_0012.png"\; state="\{\{state\}\}">right</figure-callout>}iO1}-P_{\mathrm{i.e}em\_P\mathrm{right}iO2}}{P_{\mathrm{i.e}em\_P\mathrm{<figure-callout\; id="0"\; label="right\; i\; O"\; filenames="DE102021212305A1\_0012.png"\; state="\{\{state\}\}">right</figure-callout>}iO0}}$

calculated. The limiting factors fac _Prio1 , fac _Prio2 for the priority groups Prio1 and Prio2 each have the value 1. In case III, the limiting factor fac _Prio0 is calculated using the same formula as in case II and the limiting factors fac _Prio1 , fac _Prio2 each have the value 0 and 1 For case IV, the limiting factor fac _Prio0 is calculated using the formula $\frac{P_{\mathrm{i.e}em\_P\mathrm{<figure-callout\; id="0"\; label="right\; i\; O"\; filenames="DE102021212305A1\_0012.png"\; state="\{\{state\}\}">right</figure-callout>}iO0\_Min}}{P_{\mathrm{i.e}em\_p\mathrm{<figure-callout\; id="0"\; label="right\; i\; O"\; filenames="DE102021212305A1\_0012.png"\; state="\{\{state\}\}">right</figure-callout>}iO0}}$

calculated. The value P _{dem_Prio0_Min} corresponds to the power that can be provided for the participants in the priority group Prio0, since this minimum limit must be met. In this case, the limiting factor fac _Prio1 is calculated using the formula $\frac{P_{avail}-P_{\mathrm{i.e}em\_P\mathrm{right}iO2}-P_{\mathrm{i.e}em\_P\mathrm{<figure-callout\; id="0"\; label="right\; i\; O"\; filenames="DE102021212305A1\_0012.png"\; state="\{\{state\}\}">right</figure-callout>}iO0\_Min}}{P_{\mathrm{i.e}em\_P\mathrm{<figure-callout\; id="1"\; label="right\; i\; O"\; filenames="DE102021212305A1\_0012.png"\; state="\{\{state\}\}">right</figure-callout>}iO1}}$

calculated and the limiting factor fac _Prio2 has the value 1. The limiting factors fac _Prio0 and fac _Prio1 are calculated for case V using the formula $\frac{P_{avail}-P_{\mathrm{i.e}em\_P\mathrm{right}iO2}}{P_{\mathrm{i.e}em\_P\mathrm{<figure-callout\; id="0"\; label="right\; i\; O"\; filenames="DE102021212305A1\_0012.png"\; state="\{\{state\}\}">right</figure-callout>}iO0+}{P}_{\mathrm{i.e}em\_P\mathrm{<figure-callout\; id="1"\; label="right\; i\; O"\; filenames="DE102021212305A1\_0012.png"\; state="\{\{state\}\}">right</figure-callout>}iO1}}$

while the limiting factor fac _Prio2 has the value 1. In the last case VI, the values of the limiting factors fac _Prio0 and fac _Prio1 are zero and the services requested by the participants of the highest priority group Prio2 are exceeded via the limiting factor ${\text{fac}}_{\text{Priority2}}=\frac{P_{avail}}{P_{\mathrm{i.e}em\_p\mathrm{right}iO2}}$

reduced.

6 shows an exemplary schematic representation of a hydraulic drive 10 with an electronic control unit 24 with different distribution functions within the system. The hydraulic drive 10 shown has a diesel engine 12 as a power source. Furthermore, a first hydraulic pump 14 and a second hydraulic pump 15 coupled as hydraulic primary units with a drive shaft of the diesel engine 12. Furthermore, an electric machine 16 is coupled to the drive shaft as an additional participant. Two hydraulic consumers 18, 19 with the hydraulic pump 14 and two hydraulic consumers 20, 21 with the hydraulic pump 15 are arranged in a hydraulic circuit as hydraulic secondary units. An electronic control unit 24 according to the invention with several distribution functions reads the power 25 that can be provided by the diesel engine 12, the resulting pressure medium volume flows 26, 27 that can be provided by the hydraulic pumps 14, 15, and the pressure medium volume flows 28 requested by the consumers 18, 19, 20, 21 one or determines them. From these input variables, the electronic control unit 24 determines the limited control signals 30, 31, 32, 33 for the consumers 18, 19, 20, 21 and the limited control signal 34 for the electric machine 16 according to the previous description. The distribution of the variables within the hydraulic drive 10 can be divided into a higher-level power distribution 36 , a first lower-level volume flow distribution 38 and a second lower-level volume flow distribution 39 . If necessary, participants in the superordinate power distribution 36 and participants from the first and/or second volume flow distribution 38, 39 can have the same priority.

Reference List

1

electronic control unit

3

hydraulic drive

4

power source

5, 6

Participant

8, 9

limited control signal

10

hydraulic drive

12

diesel engine

14, 15

pump

16

electric machine

18, 19, 20, 21

consumer

24

electronic control unit

25

deliverable performance

26, 27

pressure medium volume flow that can be provided

28

requested pressure medium flow rates

30, 31, 32, 33, 34

limited control signal

36

superior power distribution

38, 39

subordinate pressure medium volume flow distribution

Claims (14)

Electronic control unit (1, 24) of a hydraulic drive or for a hydraulic drive (3, 10), which has at least one power source (4) and at least one user (T _i ) that can be supplied with a physical variable (X) with a device assigned to it has priority (Prio0, Prio1, Prio2), wherein the control unit (1, 24) is set up, a quantity (X avail ) of the size (X) that can be provided by the at least one power source (4) and a quantity (X _avail ) of the size (X) from the at least one participant (Ti) or read in or determine the requested quantity (X _{dem_i} ) of the size (X), characterized in that the control unit (1, 24) is set up to provide a quantity (X _{dem_red_i} ) of the size ( X) depending on the quantity that can be made available (X _avail ), its requested quantity (X _{dem_i} ) and its priority (Prio0, Prio1, Prio2). Control unit (1, 24) after claim 1 , which is set up so that participants (Ti) of the same priority (Prio0, Prio1, Prio2) are combined in a priority group. Control unit (1, 24) after claim 1 or 2 that is set up to determine a possible undersupply of the at least one subscriber (Ti) and/or a possible overload of the at least one power source (4) depending on the quantity that can be provided (X _avail ) and the at least one requested quantity (X _{dem_i} ). . Control unit (1, 24) after claim 3 , which is set up as a function of the determined undersupply or overload, to determine a limiting factor for the respective priority groups and to limit the quantities to be provided (X _{dem_red_i} ) for the participants in these priority groups via the limiting factor. Control unit (1, 24) according to one of Claims 1 until 4 , which is set up, the respective participant (T _i ) to be provided quantity (X _{dem_red_i} ) depending on its requested quantity (X _{dem_i} ), a sum of the requested quantities (X _{dem_i} ) of the participants with the same priority (Prio0, Prio1, Prio2) or priority group and one to determine the quantity (X _avail ) available for participants with the same priority (Prio0, Prio1, Prio2). Control unit (1, 24) according to one of Claims 1 until 5 , which is set up so that the at least one participant (Ti) has an individual minimum limit for the quantity (X _{dem_red_i} ) to be provided, which is only fallen below when the requested quantity (X _{dem_i} ) of all other participants from the same priority group falls to their respective minimum limit has been limited. Control unit (1, 24) at least claim 6 , which is set up so that in the event that the quantity (X _avail ) that can be made available is not sufficient to meet the minimum limits of the respective participants (Ti), the control unit (1, 24) can supply the quantity ( X _{dem_red_i} ) is simultaneously reduced towards zero depending on the quantity (X _{dem_i} ) requested by them. Control unit (1, 24) after claim 6 , which is set up such that in the event that the hydraulic drive (3, 10) has participants (Ti) from at least two different priority groups, none of which is a highest priority group (Prio2), the control unit (1, 24) the The quantity (X _{dem_i} ) requested by the participants from a higher priority group (Prio1) is only limited if the quantity (X dem_i ) requested by the participants from a lower priority group ( _Prio0 ) has been limited to its minimum limit. Control unit (1, 24) after claim 6 which is set up so that if the hydraulic drive (3, 10) has participants from the highest priority group (Prio2), the control unit (1, 24) can supply the quantity (1, 24) to the participants in the remaining priority groups (Prio0, Prio1). X _{dem_red_i} ) is reduced to zero if only the quantity (X _{dem_i} ) requested by the participants in the highest priority group (Prio2) can be covered by the available quantity (X _avail ). Control unit (1, 24) according to one of Claims 6 until 9 That is set up so that the individual minimum limit and/or the assigned priority (Prio0, Prio1, Prio2) of the at least one participant (Ti) can be changed. Hydraulic drive (3, 10) with at least one power source (4), at least one subscriber (Ti) that can be supplied with a physical variable (X) and has a priority (Prio0, Prio1, Prio2) assigned to it, and a control unit (1, 24 ), which is designed according to one of the preceding claims, wherein this is signal-connected at least to the power source (4) and the at least one subscriber (Ti). Drive (3, 10) after claim 11 , wherein the power source (4) is a prime mover with a drive shaft, and wherein the participants (Ti) are at least one hydraulic primary unit coupled to the drive shaft and at least one hydraulic secondary unit arranged in a hydraulic circuit with it. Drive (3, 10) after claim 12 , With a further participant, which is designed as an electric machine (16) and is coupled to the drive shaft. Method with a hydraulic drive (3, 10), which has at least one power source (4) and at least one user (Ti) that can be supplied by this with a physical variable (X) and has a priority (Prio0, Prio1, Prio2) assigned to it steps - reading in or determining one of the at least one power source (4) can be provided quantity (X _avail ) of the size (X), via a control unit (1, 24) of the drive (3, 10), and - reading in or determining one of the at least a participant (Ti) or for this requested quantity (X _{dem_i} ) of the size (X), via the control unit (1, 24), characterized by a step - determining a the at least one participant (Ti) to be provided quantity (X _{dem_red_i} ) of Size (X) depending on the available quantity (X _avail ), its requested quantity (X _{dem_i} ) and its priority (Prio0, Prio1, Prio2), via the control unit (1, 24).

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