DE102017223386A1 - Slide bearing assembly for a heavy shaft, in particular a wind turbine, and control system and method for lubricating oil supply thereof - Google Patents

Abstract

The invention relates to a sliding bearing arrangement (1, 1 ') for a heavy shaft (2, 2'), in particular a wind power plant, having a hydrostatic sliding bearing (4), between which at least one bearing shell (5) and the shaft (2, 2 '). ) formed bearing gap (6) with at least one feed channel (7) for pressure lubrication of the bearing gap (6) is connected to lubricating oil by the feed channel (7) opens into a slide bearing side Zuführkanalaustrittsöffnung or lubricating oil bag (8) for storing lubricating oil, wherein in or on Supply channel (7) or in or on the lubricating oil bag (8) at least one sensor element (10; 10 ', 10 ") is arranged for detecting the presence of lubricating oil.

Description

The present invention relates to a plain bearing arrangement for a heavy shaft, in particular in a transmission or drive train of a wind turbine, with a sliding bearing, the bearing gap formed between at least one bearing shell and the shaft is connected to at least one feed channel for lubricating the bearing gap with lubricating oil. Furthermore, the invention also relates to a control system for controlling the lubricating oil supply of such a sliding bearing assembly and a method for operating control of at least one such sliding bearing assembly having machine or system, preferably wind turbine. Furthermore, a computer program product embodying the aforementioned method is also indicated.

The field of application of the invention extends to hydrostatic or hydrodynamic plain bearings for heavy waves, which are used primarily in the field of motor vehicle construction, marine technology and mechanical and plant engineering. In the context of these applications, heavy shafts are understood in particular to mean drive shafts having a shaft diameter of between 30 and 300 mm. However, there are also smaller or larger shaft diameters conceivable, if they can be equipped with a rotary bearing of the generic type here, in particular a lubricating oil supply of the bearing gap are accessible. The waves of interest here type can be found for example in wind turbines for internal gear storage of gear components, for storage of the drive train between the rotor and transmission input or for mounting a rotor blade on a hub, in which the pitch of the rotor blade is adjustable. In principle, the solution according to the invention can be applied to axial and radial slide bearing arrangements and combinations thereof.

From the US 2011/0188988 A1 goes out a technical solution for a sliding bearing of a rotor on a hub of a wind turbine, which is designed here as a thrust bearing. The axial bearing acts on opposing annular surfaces of a side arranged on the side of the proximal end of a rotor blade rotary rail. The state of the lubricating oil located in the bearing gap is determined here according to a first described embodiment via a pressure sensor which measures the bearing gap pressure from the bearing shell or the shaft, from which a control unit influences the pump control of the pressure lubrication circuit and / or the operation of the wind turbine. for example, on their dynamic state. According to another described embodiment, this control is based on a sensor technology determination of the temperature of the lubricating oil in the bearing gap. The prevailing temperature is an indicator of the load on the rotor blade. Finally, according to a further embodiment, it is proposed that the lubricant film thickness in the positional gap of the sliding bearing be determined by sensor technology, on the basis of which the aforementioned control is carried out. If the lubricant film thickness falls below a predefined minimum value, then an overloading of the rotor blade can be derived from this.

The US 2012/0068460 A1 discloses a radial sliding bearing arrangement for a drive shaft of the drive train of a wind turbine. A plain bearing forms here the rotor hub side bearing of the drive shaft. The slide bearing arrangement likewise comprises a sensor which measures the gap width and thus also the lubricant film thickness of the lubricating oil present in the bearing gap in order to control, starting from the measured value, the pump of a pressure lubrication circuit and a lift actuator of the slide bearing arrangement, with which the shaft can be stored in different hydrodynamic operating modes.

Changing operating conditions of such a slide bearing comprehensive machine or system as well as disturbances in the pressure lubrication can lead to a malfunction of the sliding bearing and cause wear, damage or even failure of the bearing.

It is therefore an object of the present invention to further improve a sliding bearing assembly of the generic type to the effect that with simple technical means a trouble-free operation is possible and can be monitored.

The object is achieved in terms of a sliding bearing assembly according to the preamble of claim 1 in conjunction with its characterizing features. With regard to a control system for controlling the pressure lubrication of the sliding bearing arrangement, reference is made to claim 9. Claim 13 specifies a method for operating control of a slide bearing arrangement having machine or system, which is preferably a wind turbine according to claim 12, and may be formed according to claim 16 as a computer program product. The respective dependent claims indicate advantageous developments of the invention.

The invention includes the technical teaching that at least one sensor element for detecting the presence of lubricating oil is arranged in or on a feed channel of the lubricating oil to the bearing gap of a hydrostatic slide bearing or in or on an optional existing lubricating oil bag.

The advantage of the solution according to the invention results from the consideration that only the presence of lubricating oil, not its pressure value, lubricating film thickness or other physical parameters are already sufficient to make a statement about the operating state of the sliding bearing. The mere presence of lubricating oil can be reliably detected by a simply constructed sensor. In other words, the solution according to the invention is based on a sensor-technical determination as to whether lubricating oil rests on the sliding bearing.

Preferably, a sensor element according to the invention may be designed as a capacitive or ultrasonic oil level sensor. A preferably operating according to this measuring principle sensor element is arranged according to a first preferred embodiment, at least partially in a vertical channel portion of the feed channel of the pressure lubrication and measures either analogously the height of the oil column or in a discrete manner at least a minimum level and a maximum level of existing in the vertical channel section lubricating oil , This embodiment of the measuring arrangement is preferably suitable for fixedly arranged waves, since the oil level can be reliably measured under these conditions. For example, the vertical channel portion of the feed channel may be arranged in a standing wave of a planetary carrier of a planetary stage.

According to an alternative embodiment, it is proposed that a sensor element designed as a flow measuring element is arranged somewhere on the supply channel of the pressure lubrication in order to measure the volume flow of lubricating oil flowing to the plain bearing supply. Such a sensor element is insensitive to its positioning relative to the embodiment discussed above and can therefore also be arranged in horizontal channel sections of the feed channel of the pressure lubrication and also in movable components. The flow measuring element can be designed as a per se known flow switch whose sensor blade protrudes with the distal end into the feed channel. A pressurization of the sensor blade caused by the flow of the lubricating oil is a measure of the volume flow flowing through it. Instead of such a flow switch, other flow measuring elements, such as screw or Turbinenvolumeter, may be arranged in the feed channel of the pressure lubrication in order to measure the flow of lubricating oil flowing to the sliding bearing.

According to a third embodiment, the sensor element may for example also be designed as an ultrasonic sensor for measuring air inclusions in the lubricating oil. The positioning of such a sensor element is preferably carried out on a lubricating oil bag of the sliding bearing assembly. The prerequisite for this is that such a lubricating oil bag exists with sufficiently large geometric dimensions. Since the presence of lubricating oil can be detected in the lubricating oil by the absence of air inclusions, for example air bubbles, an ultrasound sensor positioned in this way likewise represents a suitable alternative for the sensor element according to the invention. The air inclusions thus measured are also independent of the state of movement of the component in which the sensor element is arranged. Incidentally, an ultrasonic sensor is also suitable for measuring the oil level in a vertical channel section of the feed channel.

In the context of the present invention, a plurality of sensor elements in the region of the feed channel and the optional lubricating oil bag can be used to ensure a reliable measurement result on the presence of lubricating oil. In this case, these multiple sensor elements may also be of different types and, to that extent, be used in combination with one another. Other sensors, such as a temperature sensor or distance sensor for measuring the bearing gap width, can be combined.

The vertical channel section of the feed channel, which is formed by the shaft or by the bearing shell, preferably extends transversely to the bearing gap and / or the longitudinal extension of the lubricating oil pocket. This does not just mean exactly vertical positioning. Angular deviations are also considered "transversal". In an analogous manner, the vertical channel portion of the feed channel does not have to be exactly perpendicular to the longitudinal axis of the slide bearing assembly. According to a preferred embodiment, the vertical channel section is preceded by a horizontal channel section arranged transversely to the vertical channel section (16) and terminating therein. As a result, a lubricating oil supply is effected externally along the inside of the shaft by a short path.

A control system for controlling the pressure lubrication of a slide bearing arrangement of the type described above preferably also comprises a sensor signal conditioning unit which is assigned locally to each sensor element or arranged centrally for a group of sensor elements, which outputs a standardized measurement signal. The measurement signal is connected via a signal transmission device to a control device remote from the sensor for operation control of a machine or system comprising the slide bearing arrangement in accordance with the information detected by the at least one sensor element. In this case, the signal transmission device can at least partially as a wireless transmission device be formed, for example as a data radio device. By means of this, the sensor signal, in particular of rotating components of the slide bearing arrangement, can be transmitted to the control device if the sensor is placed in such a rotating component. As a result, wear-prone sliding contact transfers and the like are avoided. The signal transmission can be carried out as an analog or digital data transmission, for example by a BUS protocol, and in some cases also be wired. The control device receiving a continuous measuring signal via the presence of lubricating oil in the plain bearing can be part of an electronic control unit for controlling the operation of the machine or system or else, preferably in the form of an upstream electronic control unit (ECU).

• - Optimierung der Druckschmierung durch Erhöhung des Ölfördervolumens der Schmiermittelpumpe bei Ölmangel oder durch schmierungsoptimale Ansteuerung des Antriebs der Welle hinsichtlich Drehzahl, Drehmoment und/oder Leistung. Hierdurch erfolgt eine Belastungsanpassung der Schmierstrategie.
• - Bedarfsgesteuertes Erhöhen der Schmiermittelzufuhr im Stillstand und/oder Leerlauf der Welle. Hierdurch wird eine Verlängerung der Lebensdauer der Gleitlagerung erzielt.
• - Verschleißoptimierte Anfahrstrategie nach längerem Stillstand der Welle und/oder tiefen Temperaturen unter Beachtung einer hinreichenden Schmierung der Gleitlageranordnung. In diesem Zusammenhang ist es denkbar, dass die Anlage erst hochgefahren oder die Last erhöht wird, wenn ausreichend Schmierung vorhanden ist oder das Schmieröl warm genug ist. Die Steuereinrichtung oder vorgeschaltete ECU steht zu diesem Zweck signaltechnisch mit der Steuerung der Schmieröleinrichtung bzw. Ölheizung in Verbindung und schaltet die Maschine oder Anlage ein und wartet auf Rückmeldung der in der Gleitlagerung integrierten Ölanwesenheitssensorik, die auf Basis einer Füllstandsmessung, Lufteinschlussdetektion und/oder Durchflussmessung basiert.
• - Erkennen einer Leckage oder Störung in der Schmiermittelzufuhr durch Abgleich von deren Betriebsparametern mit den Messwerten der Schmieröldetektion im Gleitlager. Kommt beispielsweise kein Schmieröl trotz angeforderter Förderleistung im Gleitlager an, kann auf eine Leckage oder Störung in der Druckschmierung geschlossen werden. Auch aus dem zeitlichen Ansprechverhalten und Abgleich mit dem Verhalten zu vorherigen, vergleichbaren Betriebszuständen, insbesondere Temperatur, kann auf eine Änderung der Schmieröleigenschaft, in diesem Falle Viskosität, oder Leistungsabfall in der Druckschmierung geschlossen werden. Ein Leistungsabfall kann beispielsweise durch eine defekte Pumpe oder einen zugesetzten Ölfilter verursacht werden.
• - Notabschaltung der Maschine oder Anlage im Falle einer Mangelschmierung oder bei Eintreten eines der vorstehend beispielhaft angegebenen Störungsfälle.

By the control device or the upstream ECU, the operation of the machine or system is influenced according to a measure improving the invention depending on the state of the lubricating oil. For this purpose, the control device can also take into account other physical measured values of further sensors, for example the temperature T in the oil sump of the pressure lubrication circuit, the torque M, the rotational speed n and / or the drive power P of the sliding bearing shaft or the viscosity, the water content and / or the particle concentration of foreign substances in the lubricating oil of the pressure lubrication. As part of the operation control, the following control measures are preferably carried out to extend the service life of the slide bearing arrangement or to optimize its function:

• - Optimization of the pressure lubrication by increasing the oil delivery volume of the lubricant pump in case of lack of oil or by lubrication-optimal control of the drive of the shaft in terms of speed, torque and / or power. This results in a load adjustment of the lubrication strategy.
• - Demand-controlled increase of the lubricant supply at standstill and / or idle of the shaft. As a result, an extension of the life of the sliding bearing is achieved.
• - Wear-optimized starting strategy after a long standstill of the shaft and / or low temperatures, taking into account a sufficient lubrication of the slide bearing arrangement. In this context, it is conceivable that the system only starts up or the load is increased, if there is sufficient lubrication or if the lubricating oil is warm enough. For this purpose, the control device or upstream ECU communicates with the control of the lubricating oil device or oil heater and switches on the machine or system and waits for feedback of the oil presence sensor integrated in the plain bearing, which is based on level measurement, air entrapment detection and / or flow measurement ,
• - Detecting a leakage or malfunction in the lubricant supply by comparing their operating parameters with the measured values of the lubricating oil detection in the plain bearing. If, for example, no lubricating oil arrives in the plain bearing despite the requested delivery rate, it can be concluded that there is a leak or malfunction in the pressure lubrication. Also from the temporal response and comparison with the behavior of previous, comparable operating conditions, in particular temperature, can be concluded on a change in the lubricating oil property, in this case viscosity, or power loss in the pressure lubrication. A power loss can be caused for example by a defective pump or an added oil filter.
• - Emergency shutdown of the machine or system in the event of a lack of lubrication or on the occurrence of one of the above exemplified incidents.

It should be noted that the aforementioned method for operation control can be implemented in the form of a computer program product with program code means for its implementation and preferably runs on a dedicated software-controlled electronic control unit, in particular ECU, the control system or on a cloud platform.

Next improvement of the invention measures will be described in more detail below together with the description of preferred embodiments of the invention with reference to FIGS.

• 1 eine schematische Darstellung eines ersten Ausführungsbeispiels einer Gleitlageranordnung mit einem Ölstandssensor zur Detektion des Vorhandenseins von Schmieröl,
• 2 eine schematische Darstellung eines zweiten Ausführungsbeispiels einer Gleitlageranordnung mit einer kombinierten Sensorik aus Durchflussmesselement und Ultraschall-Sensor, und
• 3 eine Blockschaltbilddarstellung eines Steuersystems zur Steuerung der Druckschmierung für eine Gleitlageranordnung gemäß 1 oder 2.

It shows:

• 1 a schematic representation of a first embodiment of a sliding bearing assembly with an oil level sensor for detecting the presence of lubricating oil,
• 2 a schematic representation of a second embodiment of a sliding bearing assembly with a combined sensor of flow measuring element and ultrasonic sensor, and
• 3 a block diagram representation of a control system for controlling the pressure lubrication for a sliding bearing assembly according to 1 or 2 ,

According to 1 includes a slide bearing assembly 1 a heavy wave 2 which is here as stationary bearing pin of a planetary wheel bearing of a planetary gear 3 in one - not shown - planetary stage of a transmission is designed for a wind turbine.

The sliding bearing arrangement 1 includes a plain bearing 4 which is between one in the planetary gear 3 used bearing shell 5 and the wave 2 a bearing gap 6 forms. For the sliding bearing is the bearing gap 6 ideally completely filled with lubricating oil, which by pressure lubrication of a feed channel 7 out into the storage gap 6 is pressed.

In this embodiment, the sliding-bearing-side outlet opening of the feed channel opens 7 into a lube oil storing and along the storage gap 6 circulating oil bag 8th , The oil bag 8th extends the bearing gap 6 Trough-shaped radially inward.

The feed channel 7 for the lubricating oil is in this embodiment in a longitudinal direction of the shaft 2 extending horizontal channel section 9a and a subsequent vertical channel section 9b divided, which transverse to the vertical channel section 9a runs and in the oil bag 8th opens.

Along the vertical channel section 9b of the feed channel 7 for lubricating oil, a sensor element extends 10 , which here for the analogue measurement of the oil level column in the area of the vertical channel section 9b is provided. The sensor element 10 Based on a capacitive measuring principle and detects the presence of lubricating oil in the vertical channel section 9b to be able to draw a conclusion on a trouble-free plain bearing.

The sensor element 10 is with a locally assigned sensor signal conditioning unit 11 equipped, which normalizes the analog oil level measurement signal to a transmission-capable signal. The signal transmission takes place via a at the sensor signal conditioning unit 11 connected wireless signal transmission device 12 to a - not shown - receiving entity instead. The wireless signal transmission device 12 is here a standing wave 2 associated with the detection of the presence of lubricating oil by oil level measurement in the vertical channel section 9b allows.

In the 2 illustrated alternative slide bearing assembly 1' is rather for a moving wave 2 ' suitable, which rotates relative to a support structure or adjacent transmission components. At the feed channel 7 Here is a sensor element 10 ' arranged, which constitutes a flow measuring element, for measuring the presence of lubricating oil to measure the flowing to the plain bearing supply flow of lubricating oil.

Combined is the sensor element 10 ' with another sensor element 10 " another type. The further sensor element 10 " is here at the oil bag 8th arranged and designed as an ultrasonic sensor. This sensor element 10 " measures air pockets - especially air bubbles - in the lubricating oil, in order to draw a conclusion on the presence of lubricating oil on the plain bearing.

Because the wave 2 ' In this embodiment, it is designed as a moving shaft, a flow measurement is here used instead of an oil level measurement in a vertical channel section, which is combined for plausibility reasons with an air inclusion measurement.

Both sensor elements 10 ' and 10 " transmit the respective measurement signals also via a wireless signal transmission device 12 to a - not shown here - receiving entity. The rest of the structure of this slide bearing assembly 1' corresponds to the structure of the sliding bearing assembly described above 1 ,

To 3 There is a control system for controlling the pressure lubrication of a sliding bearing assembly 1' essentially of several sensor elements 10 ' and 10 " , Which based on a flow measurement or an air inclusion measurement of the lubricating oil whose presence in the hydrostatic slide bearing 4 detect the type described above. Next to it measures a temperature sensor 13 in the hydrostatic plain bearing 4 prevailing storage temperature. A significant increase in temperature may indicate bearing damage.

All through the sensor elements 10 ' . 10 " such as 13 obtained measured values are transmitted via a signal transmission device 12 wirelessly to a remote signal receiving device 14 transmitted, which is part of a sensor remote control device 15 for operation control of a sliding bearing assembly 1' comprehensive plant, here wind turbine, is. The control device 15 includes a software-controlled electronic control unit 16 , which software said operation control based on the determined sensor values and in accordance with an implemented control algorithm 17 performs.

Using the control algorithm 17 can for example by control signal 18 An emergency shutdown is initiated on the drive of the system, if the measurement data evaluation of the sensors 10 ' . 10 " and or 13 the slide bearing assembly 1' shows that there is too little or no lubricating oil in the plain bearing 4 located. The emergency shutdown thus prevents a progressive bearing damage.

The invention is not limited to the preferred embodiments described above. On the contrary, modifications are conceivable which are included in the scope of protection of the following claims. Thus, it is also possible, for example, to carry out other measures for controlling the operation of a machine or system with an oil deficiency recognized by the solution according to the invention, for example an increase in lubricant supply, in particular at standstill, a wear-optimized starting strategy after a long standstill or extremely low temperatures, leakage detection, a Optimization of the pressure lubrication by demand lubricating oil supply and the like.

Furthermore, the control system according to the invention is not limited to the fact that the method of operation control is carried out locally in the machine or plant. This can also be carried out, for example, on a client-server architecture, in which the sensory measured value determination takes place on the client side and the signal evaluation on the server side. The use of a cloud platform for this purpose is also conceivable. This offers the advantage that the determined sensor data can also be used for other purposes as an operation control of the machine or system.

LIST OF REFERENCE NUMBERS

1

plain bearing arrangement

2

wave

3

planet

4

bearings

5

bearing shell

6

bearing gap

7

feed

8th

Oil bag

9a

horizontal channel section

9b

vertical channel section

10

sensor element

11

Sensor signal conditioning unit

12

Signal transmission means

13

temperature sensor

14

Signal-receiving device

15

control device

16

control unit

17

control algorithm

T

temperature

M

torque

n

number of revolutions

P

drive power

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• US 2011/0188988 A1 [0003]
• US 2012/0068460 A1 [0004]

Claims (16)

Sliding bearing arrangement (1, 1 ') for a heavy shaft (2), in particular a wind power plant, with a hydrostatic sliding bearing (4), whose bearing gap (6) formed between at least one bearing shell (5) and the shaft (2; at least one feed channel (7) for pressure lubrication of the bearing gap (6) is connected to lubricating oil, in that the feed channel (7) opens into a slide bearing side feed channel outlet opening or lubricating oil pocket (8) for storing lubricating oil, characterized in that in or at the feed channel (7) or in or on the lubricating oil pocket (8), at least one sensor element (10; 10 ', 10 ") is arranged to detect the presence of lubricating oil. Slide bearing assembly (1, 1 ') according to Claim 1 , characterized in that the sensor element (10; 10 '') is designed as a capacitive or ultrasonic oil level sensor. Slide bearing assembly (1, 1 ') according to Claim 2 , characterized in that the sensor element (10) at least partially in a vertical channel portion (9b) of the feed channel (7) is arranged and for analog measurement of the oil level column or for the discrete measurement of at least a minimum level and a maximum level of existing there lubricating oil is formed. Slide bearing assembly (1, 1 ') according to Claim 1 , characterized in that the sensor element (10 ') arranged on the feed channel (7) is designed as a flow measuring element for measuring the volume flow of lubricating oil flowing to the plain bearing supply. Slide bearing assembly (1, 1 ') according to Claim 1 , characterized in that on the lubricating oil bag (8) arranged sensor element (10 ") is designed as an ultrasonic sensor for measuring air inclusions in the lubricating oil. Sliding bearing arrangement (1; 1 ') of several of the preceding claims, characterized in that a plurality of sensor elements (10; 10'; 10 ") of different types are used in combination. Sliding bearing arrangement (1, 1 ') according to at least one of the preceding claims, characterized in that the side of the shaft (2) or the bearing shell (5) formed vertical channel portion (9b) of the feed channel (7) transversely to the bearing gap (6) and / or the longitudinal extent of the lubricating oil bag (8) is aligned and opens here. Slide bearing assembly (1, 1 ') according to Claim 7 characterized in that the vertical channel section (9b) is preceded by a horizontal channel section (9a) arranged transversely to the vertical channel section (9b) and terminating therein. Control system for controlling the pressure lubrication of a slide bearing assembly (1, 1 ') according to one of the preceding Claims 1 to 8th , further comprising a sensor signal conditioning unit (11) locally associated with the at least one sensor element (10; 10 '; 10 ") and having signal control means (15) for controlling the operation of a sliding bearing arrangement (1; 1') via a signal transmission device (12). comprehensive machine or system in accordance with the at least one sensor element (10; 10 ', 10'') detected information is in communication. Control system after Claim 9 wherein the signal transmission device (12) is at least partially designed as a wireless transmission device in order to transmit the sensor signal from rotating components of the slide bearing arrangement (1 ') to the control device (15). Control system after Claim 9 wherein the control device (15) comprises a software-controlled electronic control unit (16) for controlling the operation of the machine or system. Wind turbine, comprising a control system according to one of Claims 9 to 11 , Method for operating control of at least one sliding bearing arrangement (1, 1 ') according to one of the Claims 1 to 8th The machine or installation having at least one sensor element (10, 10 ', 10 ") of the slide bearing arrangement (1, 1') detects the presence of lubricating oil, after which the relevant sensor signal is transmitted to a control device (15) via a signal transmission device (12) ) is transmitted, by which the operation control of the machine or plant is carried out in accordance with the sensor signal. Method according to Claim 13 wherein the operation control executes at least one control measure for prolonging the life of the slide bearing assembly (1; 1 ') or its function optimization selected from a group comprising: - Optimizing the pressure lubrication by increasing the oil delivery volume of the lubricant pump in case of oil shortage or by lubrication-optimized drive control the shaft (2, 2 ') in terms of speed, torque and / or power, - as needed increase the lubricant supply at standstill and / or idling of the shaft (2, 2'), - wear-optimized approach strategy after prolonged standstill of the shaft (2, 2 ') and / or low temperatures, taking into account adequate lubrication of the sliding bearing arrangement (1, 1'), detection of a leakage or malfunction in the lubricant supply by balancing its operating parameters with the measured values of the Lube oil detection in plain bearing (4), - Emergency shutdown of the machine or system in case of insufficient lubrication. Method according to Claim 14 , wherein in the operation control by the control device (15) physical measurements other sensors (13) flow, selected from a group comprising: - temperature (T) in the oil sump of the pressure lubrication circuit - torque (M), speed (n) and / or drive power (P) of the shaft (2, 2 '), viscosity, water content and / or particle concentration of the lubricating oil. Computer program product comprising program code means for performing the operation control according to the method of any one of Claims 13 to 15 when the computer program product on an electronic control unit (16) of a control system Claim 11 or a cloud platform expires.

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