Method for operating a mobile working machine

Abstract

A method for operating a mobile working machine is proposed, wherein at least one drive unit having at least one maximum parameter is used to drive at least one first main consumer and at least one second main consumer and at least one secondary consumer, and wherein at least one control unit is used, which at least partially improves the disadvantages of the prior art or, in particular, controls the main consumers with the help of so-called "power management" so that the motor can provide sufficient torque.According to the invention, this is achieved by forming an actual parameter difference between the maximum parameter of the drive unit and a sum of at least one first actual parameter of the first main consumer and one second actual parameter of the second main consumer as well as one third actual parameter of the at least one auxiliary consumer, by forming at least one main consumer actual parameter sum which is formed from at least one first actual parameter of the first main consumer and from one second actual parameter of the second main consumer, and by using a first component of the first actual parameter of the first main consumer in the main consumer actual parameter sum and a second component of the second actual parameter of the second main consumer in the main consumer actual parameter sum, wherein the actual parameter difference is divided at least into the first component and the second component.

Description

[0001] The invention relates to a method for operating a mobile working machine, wherein at least one drive unit having at least one maximum parameter according to the preamble of claim 1. State of the art

[0002] Given the stringent regulations regarding emissions reduction, developers of self-driving work machines are forced to prioritize both economic and environmental requirements. Downsizing combustion engines is necessary to conserve resources of all kinds and reduce emissions. However, this creates new challenges; the engine must be perfectly matched to its power consumers.

[0003] One challenge of power distribution is that the maximum torque available from the engine depends on several factors. The oxygen content supplied to the combustion chamber in internal combustion engines is a crucial factor for power output and therefore also for available torque. For example, engine power decreases with increasing altitude, meaning that maximum power also depends on the operating environment. Other influencing factors include the temperature of the air supplied to the combustion chamber. The responsiveness of a turbocharged internal combustion engine must also be considered. During a load change, starting from a low load, the turbocharger needs a certain amount of time to reach its operating speed and build up sufficient boost pressure. In this case, maximum torque cannot be provided at the beginning of the load change, but only after a delay.For these reasons, the engine constantly varies its maximum available torque. But it's not just the engine's maximum power that changes; the power demands of its electrical consumers are also constantly changing.

[0004] Engine components are typically divided into primary and secondary consumers. Primary consumers of a machine include the main pump and the drive pump. These primary consumers supply the machine's most important functions, which the operator can directly control. Secondary consumers, on the other hand, generally play a subordinate role; they are necessary for the machine's basic functions. Parasitic loads are also classified as secondary consumers. The operator can usually only control secondary consumers indirectly. Examples of secondary consumers include the gear pump for the braking and steering systems, or the friction between moving pump parts.

[0005] The electrical consumers are generally supplied by the engine via the drive shaft or the auxiliary drive. The torque generated by the engine must therefore be distributed between the main consumers and the auxiliary consumers. Not only do the torque requirements of the main consumers change constantly, but so do those of the auxiliary consumers. A variable-speed fan is one example of a dynamic auxiliary consumer. In contrast, friction in the bearings, for example, is categorized as a static auxiliary consumer.

[0006] The difficulty here is that the constantly changing sum of the torques of all main and auxiliary consumers must always be less than or equal to the maximum available engine torque. If this rule is violated, the engine may stall unintentionally.

[0007] Another problem is the tolerance-related differences in the components installed in a machine. Due to these tolerances, motors of the same series differ in their efficiency and therefore in their maximum power output. The same applies to consumers, with the added factor, for example, that axial piston variable displacement pumps have a low efficiency when new and increase with operating hours.

[0008] Given the possible combinations of engine and power consumers, the maximum power output of machines from the same series can differ or change with operating time. For this reason, each machine requires individual adjustment of its power controllers, or a uniform setting is chosen for all machines, ensuring flawless operation even in a worst-case combination of engine and power consumers. However, with the latter solution, the performance of most machines cannot be fully utilized.

[0009] For example, a regulation of the engine and the consumers is known from EP 2 130 980 A2. Purpose and advantages of the invention

[0010] The object of the invention, in contrast, is to propose a method for operating a mobile work machine that at least partially improves the disadvantages of the prior art, or in particular, with the aid of so-called "power management," controls the main consumers in such a way that the motor can (always) provide sufficient torque, or ensures that each consumer always has sufficient power available so that as few consumers as possible are undersupplied, thereby ensuring that the machine remains fully operational at all operating points, and / or that dynamic load changes by consumers can be matched to the motor, and / or that an adjustable energy-saving operating state (so-called "ECO Mode") can be implemented, and / or that performance differences due to component tolerances can be (automatically) compensated.

[0011] This problem is solved, starting from a method for operating a mobile working machine of the type mentioned in the introduction, by the features of claim 1. Advantageous embodiments and further developments of the invention are possible by the measures mentioned in the dependent claims.

[0012] Accordingly, a method according to the invention is characterized in that an actual parameter difference is formed between the maximum parameter of the drive unit and a sum of at least one first actual parameter of the first main consumer and one second actual parameter of the second main consumer as well as one third actual parameter of the at least one auxiliary consumer, that at least one main consumer actual parameter sum is formed, which is formed from at least one first actual parameter of the first main consumer and from one second actual parameter of the second main consumer, and that a first component of the first actual parameter of the first main consumer in the main consumer actual parameter sum and a second component of the second actual parameter of the second main consumer in the main consumer actual parameter sum is used, wherein the actual parameter difference is divided at least into the first component and the second component.

[0013] This measure ensures that the main consumers, which are particularly important for the machine, can be supplied according to their respective, current share of the available torque and / or power, or similar factors. This effectively prevents one or more of the main consumers from being inadequately supplied or operated.

[0014] Advantageously, the maximum parameter of the drive unit is calculated as the sum of at least one maximum actual parameter of the drive unit and one offset actual parameter, where at least the offset actual parameter is dependent on the rotational speed of the drive unit. A certain tolerance or reserve is generated / used by means of the advantageous offset (actual) parameter. For example, a short-term and / or abrupt change in the required torque and / or power of the consumers can be advantageously "cushioned" or compensated for without resulting in an "undersupply" of one of the main consumers.

[0015] This also allows for adjustments to, for example, the changing maximum power or maximum torque of the drive unit or drive motor, especially combustion / diesel engines, depending on the speed, and / or adjustments to different manufacturing tolerances of the components used in the machine, i.e., the drive unit or motor and / or the main and / or auxiliary / consumers and / or the different losses or frictions / resistances of moving elements / components.

[0016] Accordingly, the advantageous offset (actual) parameter can compensate for very high dynamic changes in the parameter(s) and / or (automatically) compensate for performance differences due to component tolerances. This ensures the machine remains fully operational at all possible operating points and in all working machines, especially despite component / manufacturing tolerances.

[0017] According to the invention, at least one first parameter limit of the first main consumer is used to limit the first actual parameter, and at least one second parameter limit of the second main consumer is used to limit the second actual parameter. The limit of the actual parameter prevents undersupply. This further improves the operation of the machine and ensures that the motor can (always) provide sufficient torque, that each consumer always has sufficient power available, so that as few consumers as possible experience undersupply. This ensures that the machine remains fully operational at all operating points, and that dynamic load changes by consumers can be coordinated with the motor.

[0018] According to the invention, the first parameter limit of the first main consumer is formed at least as the sum of the first actual parameter of the first main consumer and the difference between the actual parameters, multiplied by the first share, and the second parameter limit of the second main consumer is formed at least as the sum of the second actual parameter of the second main consumer and the difference between the actual parameters, multiplied by the second share. This achieves a proportional distribution of the difference or the distributable parameter, such as torque or power. In this way, the main consumers, which are particularly important for the driven machine, can be supplied according to their respective, current share of the available torque and / or power, or the like. This effectively prevents one or more of the main consumers from being inadequately supplied or operated.

[0019] Preferably, the sum of all components is one. Consequently, a complete distribution of the available actual parameter, such as power and / or torque, takes place.

[0020] Advantageously, at least the first and second components are modified depending on the actual operating conditions. This allows for a beneficial adaptation to the current operating situation.

[0021] For example, the first main consumer is designed as a first hydraulic pump and / or used to operate a drive element, e.g., a drive wheel / roller and / or tracked undercarriage or vibratory element. Similarly, the second main consumer can, for example, be designed as a second hydraulic pump and / or used to operate a lifting device, in particular a lifting arm, grab arm, telescopic arm, or the like, and / or a working tool, e.g., a grab / bucket, fork, vibratory element, milling cutter, snowplow, or the like, and / or a tool holder for receiving the working tool. This covers the specific functions of the working machines.

[0022] The electronic control unit is designed to control the drive unit, the first main consumer, and the second main consumer. For example, the electronic control unit is configured to control the auxiliary consumer and / or the lifting device and / or the working tool and / or the tool holder, and / or the operating element is configured as a foot pedal, joystick, keyboard, touchscreen, and / or touchpad, and / or is used for manual operation by an operator and / or for setting a target parameter for the lifting device and / or the working tool and / or the tool holder by the operator. This allows existing components of the machine to be advantageously used for the invention. This reduces the effort, especially the financial and design costs.

[0023] Advantageously, the sensor is designed to detect an actual parameter of the drive unit and / or the first main consumer and / or the second main consumer and / or the auxiliary consumer and / or the first hydraulic pump and / or the second hydraulic pump and / or the lifting device and / or the working tool and / or the tool holder. Consequently, the advantageous parameter values ​​can be precisely and rapidly detected and used for the invention.

[0024] According to the invention, it is also effectively prevented that, as in the prior art, the currently required torque of all main consumers is not known and for this reason, for example, no closed equation can be established to form the relationship between the engine torque, the torque of the main consumers and the auxiliary consumers.

[0025] Without current torque data, it's impossible to calculate a ratio between the main consumers themselves, and conversely, a torque limit cannot be set due to a lack of hardware and software capabilities. Calculating a torque ratio and setting a torque limit is necessary when multiple main consumers are operating simultaneously in machinery and the engine is already operating at full capacity. It's possible that one of the main consumers draws too much power, resulting in another consumer in the system being undersupplied. This leads to the undersupplied main consumer shutting down.

[0026] Currently, operators of construction machinery can typically select an eco-mode, which allows the machine to operate in an energy-saving state. To achieve economical fuel consumption, it is essential that the engine maintains a constant speed and avoids drops in speed caused by sudden load changes. Implementing the eco-mode is currently only partially possible using the power controllers of the main consumers. For example, the power controller on axial piston variable displacement pumps can only be reduced within a certain range. However, further reduction is necessary or desirable. Furthermore, it is not yet possible to use the power controller of the main consumers to smooth out abrupt load changes, which is crucial for economical fuel consumption.

[0027] Advantageously, the state variables are read and evaluated by an engine control unit (ECU). The ECU executes, for example, an algorithm that calculates the generated torque, taking into account the operating conditions, including factors such as the air mass flow and the injected fuel quantity. Typically, the ECU provides several torque signals; relevant signals include, for example, the following: Actual Maximum Available Engine Torque at Current Speed ​​Actual Maximum Available Engine Torque (M max ) Actual Engine Torque (M Ist )

[0028] The first signal is the maximum available engine torque at the current speed. This is the torque that can be drawn by the consumers in the near future. The second signal is the maximum available engine torque, but relative to the maximum torque peak. The last signal is the current engine torque acting on the drive shaft. This signal is the sum of the torques of all consumers. The following is a helpful list of various consumers of an exemplary machine: Working pumps, gear pumps, drive pumps (hydrostatic drive), alternator, air conditioning compressor, variable speed fan, engine friction, etc.

[0029] To ensure, for example, that the drive / combustion engine operates as efficiently as possible at full load, the difference between the maximum available engine torque and the current engine torque should be zero. For this to happen, the electrical consumers must be able to adjust quickly enough to the dynamic changes. This requirement is met, for example, by an open-circuit axial piston variable displacement pump equipped with an electro-hydraulic control valve. The pump's swivel angle and swivel rate are controlled by a proportional directional control valve. The pump itself is equipped with a swivel angle sensor and a pressure sensor. These parameters are advantageously used to calculate, among other things, the instantaneous torque required to deliver the hydraulic power and to provide this information via an electronic interface, such as a CAN bus or similar system.However, generally not only data / information are sent as signals, but limit values ​​or control variables of the pump can also be specified.

[0030] One of the limit values ​​is, for example, the maximum torque limit of the pump. As soon as the pump torque reaches the predefined limit, the pump retracts or stops extending. The maximum power of the working hydraulics can thus be dynamically varied and limited. The operating principle of hydrostatic drive systems, which consist of a closed-loop axial piston variable displacement pump as the drive pump and an axial piston variable displacement motor as the drive motor, is similar. A torque limit can be dynamically set via an electronic interface, and the currently delivered torque is provided as information. These exemplary data transmission characteristics are highly advantageous because a kind of summation equation can be established within the framework of torque management, as already described above by equation (1). Example of implementation

[0031] An embodiment of the invention is shown in the drawing and is explained in more detail below with reference to the figures.

[0032] In detail: Figure 1 is a schematic diagram of a composition of a current engine torque of a working machine according to the invention; Figure 2 is a schematic diagram of an engine torque characteristic curve as a function of engine speed; Figure 3 is a schematic diagram of a result derived from the characteristic curve according to Figure 2 resulting torque offsets, Figure 4 a schematic diagram of a composition of a currently maximum available motor torque and Figure 5 a schematically represented block diagram of an exemplary signal flow from a power management system of a self-driving work machine according to the invention.

[0033] Figure 5Figure 1 shows an example of a schematic block diagram of a so-called power management system for a self-propelled, mobile work machine. Here, an internal combustion engine 30 or diesel engine 30 drives a first main consumer 1 or a work pump 1, a second main consumer 2 or drive pump 2, a first auxiliary consumer 41 or air conditioning compressor 41, and a second auxiliary consumer 42 or gear pump 42.

[0034] A diesel engine 30 is assigned an engine control unit 31, between which signals are exchanged. These include signals 32 from the engine 30 to the control unit 31, such as temperature, air pressure, actual engine speed, etc., and signals 33 from the control unit 31 to the engine 30, such as target engine speed, etc. Signals 34 from the control unit 31 are forwarded to a (shared) bus 51, such as actual M, maximum M, engine speed n, etc. The bus 51 communicates with and exchanges signals 52 with a machine control unit 50 or a control unit 50.

[0035] Basically or according to the in Figure 5In the illustrated example, each main consumer 1, 2 to N is assigned its own separate control unit 11, 21 to N1, and advantageously, a bidirectional connection or bidirectional signals 12 for, e.g., swivel angle, working pressure, etc., and signals 13 for, e.g., control current, or signals 22 for, e.g., swivel angle, working pressure, etc., and signals 23 for, e.g., control current, exist between these. Furthermore, a bidirectional connection or bidirectional signals 14 for MIst1, signals 15 for a first torque limit MLim1, or signals 24 for MIst2, signals 25 for a second torque limit MLim2, advantageously exists between the main consumer control units 11, 21 and the bus 51.

[0036] Basically or according to the in Figure 5In the example shown, auxiliary consumers 41 to 4N do not have their own control units. This advantageously differentiates or weights / evaluates the main consumers 1, 2 and auxiliary consumers 41, 42.

[0037] A torque management system for a self-propelled work machine according to the invention pursues, among other things, the goal of advantageously distributing the available engine torque MIs to all main consumers 1, 2 in user-defined proportions. The engine torque MIs is divided between the auxiliary consumers 41, 42 and the main consumers 1, 2 (see Figure 1). Figure 1 and 5 ).

[0038] The current torque drawn by auxiliary consumers 41, 42 will be referred to below as the current auxiliary consumer torque MAuxiliary. This torque is calculated as follows: M Neben = M Ist − M Ist 1 − M Ist 2 − … − M IstN where MIst1 to MIstN describe the current torque of all main consumers 1, 2 to N. Thus, in Figure 1 The torque curves over time are shown graphically as an example. This is in Figure 1 The motor torque MIst shown in the present, advantageous example is composed of two main consumers 1, 2 and the secondary consumers 41, 42.

[0039] The first main consumer 1 draws its load M Ist1 in the short term (see "hill" in Figure 1 ), however, the second main consumer 2 draws a constant load Mactual2. Since the torques of the main consumers 1, 2 are advantageously known, the torque Mauxiliary of the auxiliary consumers 41, 42 can be determined by applying the above equation (2). If the operator switches on an auxiliary consumer 41 or 42, such as the air conditioning, the current engine torque Mactual increases, and thus also the proportion of Mauxiliary. Figure 1For illustrative purposes, however, the auxiliary consumer 41 is not shown, but rather, as explained above, one of the main consumers M Ist1 with a temporarily higher torque requirement (see above "hill"), e.g. when lifting a lifting arm with a large weight, i.e. a higher torque requirement of the working pump 1 to lift an excavator arm with a filled bucket or the like.

[0040] Furthermore, the torque MFrei available to the main consumers 1 and 2 can be calculated. It is calculated as follows: M Frei = M Max − M Ist − M Off n , where M Off is referred to as the torque offset limit. This value depends on the current motor speed (n), thus defining the speed-torque relationship of the motor (see...). Figure 2This is necessary as soon as the engine speed n of the driven machine is changed. Typically, an internal combustion engine can generate little torque M at low speeds, which is why the value of M Off must be high here. Conversely, the value of M Off is low or zero at the point of torque peak (see...). Figure 2 ).

[0041] The torque M versus the rotational speed n of a diesel engine 30 is in the Figure 2This is illustrated as an example. The torque peak, for instance, has a value of 300 Nm and occurs at a speed of 1600 rpm. At this operating point, the engine can provide its maximum torque Mmax-all. However, the available torque Mmax is lower as soon as the speed n deviates from 1600 rpm. For example, 250 Nm can be provided at a speed n of 1000 rpm. The difference between the torque peak Mmax-all and the operating point (actual) at 1000 rpm must be compensated for by Moff. In this case, Moff must assume a value of, for example, 50 Nm. The area between the 300 Nm line and the curve represents the proportion of Moff across the engine speed n. Figure 3 The course of M Off as a function of engine speed n is illustrated separately.

[0042] The torque ratio, which is defined by equation (3), is shown schematically in Figure 4The current engine torque Mactual increases due to consumption by the first main consumer 1 and consequently decreases again – a torque increase is visible in the center (see above "hill"). Therefore, the proportion of Mfree in this area must be low, as less torque Mfree is now available for other consumers, specifically for the second main consumer 2 and the auxiliary consumers 41, 42.

[0043] Advantageously, in the next step, MFree is advantageously distributed individually to the main consumers 1 and 2. A torque limit MLim of the main consumers 1 and 2 is calculated by M Lim 1 = M Ist 1 + M Frei * Fac 1 , M Lim 2 = M Ist 2 + M Frei * Fac 2 , … M LimN = M IstN + M Frei * FacN . The factors Fac1 to FacN demonstrate the relationship between consumers 1, 2, 41, 42. At full load of engine 30, the following applies: Fac 1 + Fac 2 + … + FacN = 1 , The factors can typically change dynamically, as they in turn may be dependent on other influencing variables. In a non-inventive embodiment, a limitation of individual main consumers 1, 2 can be achieved, for example, by setting individual factors to zero.

[0044] Furthermore, for example, the control of the main consumers 1, 2 is made possible by limiting the torque.

[0045] Figure 5This illustrates the previously described example of a possible signal flow between the control units 11, 21 of the main consumers 1, 2, the machine control unit 50, and the engine control unit 31 of a self-propelled work machine. The diesel generator 30, for example, supplies the work pump 1 and the drive pump 2, which function as main consumers 1, 2 in the system. The gear pump 42, which is considered an auxiliary consumer 42, is also connected to the pump train. Another auxiliary consumer 41 is, for example, the air conditioning compressor 41, which may be attached to the engine 30.

[0046] The arrows in Figure 5The signal flow direction is indicated by the machine control unit 50 receiving signals 34 from the motor control unit 31. Furthermore, the machine control unit 50 receives the current torques MIst1 and MIst2 of the main consumers 1 and 2. Based on this information / signals 14 and 24, the torque limits MLim1 and MLim2 of the main consumers 1 and 2 can be calculated. The machine control unit 50 transmits signals 15 and 25 to the control unit 11 and 21 of the main consumers 1 and 2. The control unit 11 and 22 of the main consumers 1 and 2 uses control current 13 and 23 to position the actuators (not shown) so that the torque limits MLim1 and MLim2 are maintained.

[0047] In principle, all types of main consumers 1, 2 can be used for so-called power management as soon as a torque limit MLim1 and MLim2 can be advantageously specified via an electronic interface or bus 51. Furthermore, the main consumer 1, 2 can provide the currently delivered torque or a derivation of the torque from its state variables.

[0048] In general, the aforementioned invention can be implemented / applied not only with hydraulic pumps, but also with main electrical loads in the system. An example of a main electrical load is an electric rotary drive / rotary motor. Electric drive systems or other electric actuators may also be operated or controlled accordingly.

[0049] The engine does not necessarily have to be an internal combustion engine 30 (see above); the use of a (purely) electric system consisting of accumulators and electric motors is also feasible.

[0050] In principle, it is advantageous to provide an electronic interface for obtaining the state variables, whereby the current torque is calculated directly or indirectly from these variables and provided, along with the possibility of limiting the torque. Instead of torque, power or other derivatives thereof can also be used.

[0051] Further special advantages of the invention and / or advantageous variants of the invention are: Efficient machine utilization at full load through control of the main consumers. Sufficient power is always available to the consumers, eliminating the risk of undersupply. The torque supplied by the motor is individually distributed among its consumers. Energy-saving operation is achieved primarily through torque limitation. Reliable machine operation at lower speeds is ensured. For example, by controlling the torque limit of the main consumers, engine speed drops are significantly reduced compared to current technology. In ECO mode, for instance, the engine speed is not necessarily reduced; a beneficial torque limitation has a fuel-saving effect. Performance differences due to component tolerances are automatically compensated for. Application-dependent power adjustment is achieved through an efficient algorithm.Full power is available even at low altitudes above sea level, while limiting the power consumption of the consumers advantageously reduces soot buildup in the particulate filter at higher altitudes. Good coordination between the main consumers is possible to suppress vibrations and fluctuations caused by changing power demands. In particular, speed fluctuations during driving can also be reduced. The use of electronically controlled main consumers within the system is feasible. Current state variables, such as the current torque drawn or the current power consumption, are provided by the main consumers via an electronic interface. Furthermore, it is possible to reduce the main consumer's output by setting a torque limit or a power limit via an electronic interface.Establishing the relationship between engine torque, the torque of the main consumers, and the torque of the auxiliary consumers – see equation (1). Calculating the torque (see above) that is made available to the main consumers.

Claims

1. Method for operating a mobile working machine, wherein at least one drive unit (30) having at least one maximum parameter, in particular an internal combustion engine (30), such as a diesel engine (30), for driving at least one first main consumer (1) and for driving at least one second main consumer (2) and for driving at least one secondary consumer (41, 42), in particular an air-conditioning compressor, gear pump, alternator, fan, engine friction or the like, wherein at least one electrical and / or electronic control unit (50) is used, wherein the electronic control unit (50) is designed to control the drive unit (30), the first main consumer (1) and the second main consumer (2), wherein at least one operating element is used by the operator to specify a target parameter, wherein at least one sensor is used to detect an actual parameter, in particular an actual power and / or an actual torque, characterized in that an actual parameter difference (MFrei) between the maximum parameter (MMax) of the drive unit (30) and a sum at least of a first actual parameter (MIst1) of the first main consumer (1) and a second actual parameter (MIst2) of the second main consumer (2) and a third actual parameter (MNeben) of the at least one secondary consumer (41, 42) is formed, in that at least one main consumer actual parameter sum is formed, which is formed at least from the first actual parameter (MIst1) of the first main consumer (1) and from the second actual parameter (MIst2) of the second main consumer (2), and in that the main consumer actual parameter sum is divided at least into a first and a second portion, wherein the first portion (Fac1) is the portion of the first actual parameter of the first main consumer (1) in the main consumer actual parameter sum and the second portion (Fac2) is the portion of the second actual parameter of the second main consumer (2) in the main consumer actual parameter sum, wherein the first and the second portion (Fac1, Fac2) are used to divide the actual parameter difference proportionally into at least the first portion and the second portion, wherein a first parameter limit (MLim1) of the first main consumer (1) is formed at least from a sum of the first actual parameter of the first main consumer (1) and the actual parameter difference multiplied by the first portion, wherein a second parameter limit (MLim2) of the second main consumer (2) is formed at least from a sum of the second actual parameter of the second main consumer (2) and the actual parameter difference multiplied by the second portion, so that there is at least one first parameter limit (MLim1) of the first main consumer (1) for limiting the first actual parameter (MIst1) and at least one second parameter limit (MLim2) of the second main consumer (2) for limiting the second actual parameter (MIst2), so that undersupply to the first and the second main consumer is prevented.

2. Method according to Claim 1, characterized in that the maximum parameter of the drive unit (30) is formed as a sum at least of a maximum actual parameter of the drive unit (30) and an actual offset parameter, wherein at least the actual offset parameter is dependent on a rotational speed of the drive unit (30).

3. Method according to either of the preceding claims, characterized in that the sum of all the portions is one.

4. Method according to any of the preceding claims, characterized in that at least the first and second portions are changed depending on the actual operation.

5. Method according to any of the preceding claims, characterized in that the first main consumer (1) is designed as a first hydraulic pump and / or is used for operating a drive element, for example drive wheel / roller and / or tracked running gear or vibration element.

6. Method according to any of the preceding claims, characterized in that the second main consumer (2) is designed as a second hydraulic pump and / or is used for operating a lifting device, in particular a lifting arm, gripping arm, telescopic arm or the like, and / or a working tool, for example a grab shovel, fork, a vibration element, a milling cutter, a clearing plate or the like, and / or a tool holder for receiving the working tool.

7. Method according to any of the preceding claims, characterized in that the electronic control unit (50) is designed to control the secondary consumer (41, 42) and / or the lifting device and / or the working tool and / or the tool holder.

8. Method according to any of the preceding claims, characterized in that the operating element is designed as a foot pedal, so-called joystick, keyboard, touchscreen and / or touchpad and / or is used for manual operation / actuation by an operator and / or for the operator to specify a target parameter of the lifting device and / or the working tool and / or the tool holder.

9. Method according to any of the preceding claims, characterized in that the sensor is designed to detect an actual parameter of the drive unit and / or of the first main consumer (1) and / or of the second main consumer (2) and / or of the secondary consumer (41, 42) and / or of the first hydraulic pump and / or of the second hydraulic pump and / or of the lifting device and / or of the working tool and / or of the tool holder.

10. Method according to any of the preceding claims, characterized in that the mobile working machine is designed as a wheel loader, telescopic loader, excavator, tractor, ground compaction device such as a vibration tamping machine, a vibration plate or a roller.

11. Mobile working machine, in particular a wheel loader, telescopic loader, excavator, tractor, ground compaction device such as a vibration tamping machine, a vibration plate or a roller, or the like, characterized in that the working machine is operated by a method according to any of the preceding claims.

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