DE102020125848A1 - Method for detecting overheating of a roller bearing in an agricultural machine, evaluation unit and agricultural machine - Google Patents

Abstract

The invention relates to a method for detecting overheating of a roller bearing (3) of an agricultural machine (1) using a gas sensor (11), the roller bearing (3) having a bearing monitoring component (30), with at least the following steps: - detecting of gaseous substances (Sn) in a sensor environment (U) of the gas sensor (11),- determining whether in the sensor environment (U) of the gas sensor (11) as a gaseous substance (Sn) at least one indicator substance can be detected, the at least one indicator substance depending on a temperature of the roller bearing (3) from the at least one bearing monitoring component (30) of the roller bearing (3) is separated;- creating a detection result if an indicator substance in the sensor environment (U) can be detected; and- determining and/or outputting a degree of overheating of the respective roller bearing (3) as a function of the detection result, the degree of overheating indicating whether and/or to what extent the respective roller bearing (3) has overheated.

Description

The invention relates to a method for detecting overheating of a roller bearing of an agricultural machine, in particular a combine harvester or a baler, an evaluation unit and an agricultural machine, in particular a combine harvester or a baler.

Agricultural machines are normally exposed to high permanent loads during use. If agricultural machines of this type are operated in extreme heat, this can lead to critical operating states of components of the agricultural machine. During the harvest season in particular, serious fires in combine harvesters or baling presses repeatedly occur due to overheated roller bearings, especially ball bearings. The overheated roller bearings can ignite the very dry straw or hay in the harvesting machine, which can lead to serious consequential damage. Since the roller bearings are built into the interior of the harvesting machine, the driver cannot directly see such an emerging fire due to overheating of the roller bearing and can therefore only recognize it very late, and he can smell the resulting gases. Even the gaseous substances that occur in such fires can only be noticed very late in the driver's cab.

A visual perception is usually only given when it is too late, i.e. when a fire has already broken out. The only option left for the driver is to flee the combine harvester. In the case of baling presses, it is sometimes still possible for the driver to detach them from the towing vehicle in good time if he has recognized the fire early on. It is therefore desirable that overheating of a roller bearing, which can lead to a fire in the agricultural machine, can be detected at an early stage. In the case of automated agricultural machines, too, it is desirable to avoid such fires due to overheating of the roller bearings or to react to them in good time.

In DE 20 2006 001 705 U1 temperature monitoring for such rolling bearings is proposed. Since overheating of the rolling bearings usually only occurs in the field in summer when it is very hot, direct temperature monitoring is difficult to implement in this case and is disadvantageous. In addition, each roller bearing would have to be monitored individually with a corresponding sensor in order to be able to meaningfully determine the temperature of the roller bearing. Furthermore, the use of a smoke detector is described, with such smoke detectors normally functioning optically, for example via a light barrier, or thermally, for example via a temperature change, or both variants are combined with one another. The disadvantage here is that optical detection is completely unsuitable in the field where there is a lot of dust in the air. Determining the change in temperature is also unsuitable due to the great heat that prevails, as already described.

Gas sensors or molecular sensors are also generally known from the prior art, for example from CN 206339536 U or JP 3006629 B2 with which molecules can be detected in general. In US2011089255A1 it is also described that when a foul smell is detected in the vehicle environment, a certain gaseous substance is released in the vehicle in order to compensate for the foul smell. In US10118577B1 is also described to monitor whether a space in the vehicle is occupied by a person or an object, with odors in particular being detected by a gas sensor.

In KR 100559320 B1 is also generally described using gas sensors inside or outside the vehicle to detect dangerous substances outside or a gaseous substance due to a fire outside or inside the vehicle. In DE 10 2018 116 282 A1 also describes how to detect odors or gaseous substances and, depending on this, to conclude that a component of the vehicle has failed or is about to fail. Data from an odor sensor are compared with fingerprint compositions.

Accordingly, in the publications mentioned, either a fire that has already started is detected or a vehicle component that has failed or is about to fail is determined. However, in none of the publications mentioned is the approach taken to actively identify the risk of a fire due to a roller bearing becoming too hot.

The object of the invention is therefore to specify a method with which the roller bearing of an agricultural machine can be monitored for overheating in a simple and reliable manner. The object of the invention is also to specify an evaluation unit and an agricultural machine.

This object is achieved by a method, an evaluation unit and an agricultural machine according to the independent claims. The dependent claims indicate preferred developments.

• - Detektieren von gasförmigen Stoffen in einer Sensorumgebung des Gassensors;
• - Ermitteln, ob in der Sensorumgebung des Gassensors als gasförmiger Stoff mindestens ein Indikatorstoff nachgewiesen werden kann, wobei der mindestens eine Indikatorstoff in Abhängigkeit einer Temperatur des Wälzlagers aus dem mindestens einen Lager-Überwachungsbauteil des Wälzlagers abgesondert wird;
• - Erstellen eines Detektionsergebnisses, wenn ein Indikatorstoff in der Sensorumgebung nachgewiesen werden kann; und
• - Ermitteln und/oder Ausgeben eines Überhitzungsgrades des jeweiligen Wälzlagers in Abhängigkeit des Detektionsergebnisses, wobei der Überhitzungsgrad angibt, ob und/oder wie stark das jeweilige Wälzlager überhitzt ist.

According to the invention is therefore a method for detecting overheating of a roller bearing, preferably a ball bearing, of an agricultural machine using at least one gas sensor arranged in the agricultural machine, in particular a molecular mass sensor, the roller bearing having at least one bearing monitoring component, with at least the following steps intended:

• - Detecting gaseous substances in a sensor environment of the gas sensor;
• - Determine whether at least one indicator substance can be detected as a gaseous substance in the sensor environment of the gas sensor, wherein the at least one indicator substance is separated from the at least one bearing-monitoring component of the roller bearing as a function of a temperature of the roller bearing;
• - Creating a detection result if an indicator substance can be detected in the sensor environment; and
• - Determining and / or outputting a degree of overheating of the respective roller bearing depending on the detection result, the degree of overheating indicating whether and / or how much the respective roller bearing is overheated.

Starting from DE 20 2006 001 705 U1 is therefore exploited according to the invention that the bearing monitoring component of the roller bearing, for example a cover disk or lubricating grease of the roller bearing, only separates out certain clearly identifiable indicator substances when it is warmed up, since the warming up causes chemical and physical changes in the material of the roller bearing or the bearing monitoring component result. As a result, gaseous substances are separated from selected aromatic substances in the material of the bearing monitoring component, which can be perceived as indicator substances outside of the roller bearing.

Therefore, when detected by the gas sensor, these indicator substances can advantageously be used as indicators that can indicate the degree of overheating of the respective rolling bearing. The degree of overheating indicates whether the agricultural material being conveyed or processed near the store is likely to ignite due to a roller bearing that has become too hot, with a higher degree of overheating being able to indicate an increased probability, for example. If a roller bearing has run very hot, which corresponds to a higher degree of overheating, the risk of the agricultural item igniting is very high, while a roller bearing that has run moderately hot can be assigned a lower degree of overheating with a correspondingly lower probability of the agricultural item igniting. This risk assessment can be carried out down to a zero degree of overheating, at which the roller bearing is not overheated and the probability of the agricultural item igniting is correspondingly low.

According to the invention it is thus recognized that instead of using an optical and/or thermal measurement according to DE 20 2006 001 705 U1 the detection of certain specified indicator substances can also be used to indicate overheating of a roller bearing in the agricultural machine. This can advantageously be used to prevent an imminent ignition of agricultural material or to react adequately to such a possible ignition. It is specifically provided that the degree of overheating of the roller bearing is determined without using a sensor that monitors the temperature of the bearing monitoring component or of the roller bearing.

Provision is preferably made for the detection result to include that an indicator substance was actually detected in the sensor environment and/or that a specific indicator substance concentration of an indicator substance detected in the sensor environment was detected. In the simplest embodiment, the result of the detection can only indicate that one of the indicator substances was actually detected and/or additionally in what quantity or concentration, which subsequently results in different possibilities for determining the degree of overheating assigned to the indicator substance.

It can preferably be provided that the degree of overheating of the roller bearing is determined as a function of at least one indicator temperature, with each indicator substance being assigned at least one indicator temperature, and/or as a function of the indicator substance concentration of the indicator substance detected in the sensor environment.

According to a first embodiment, it is provided that the indicator temperature indicates the temperature of the bearing monitoring component from which the respective indicator substance can be detected by the gas sensor, so that the degree of overheating of the roller bearing is determined as a function of the indicator temperature assigned to the respective indicator substance, if it follows from the detection result that an indicator substance is present in the sensor environment. It becomes general It is assumed that the temperature of the roller bearing is approximately the same as the temperature of the bearing monitoring component. If a specific indicator substance is detected, it is easy to conclude that the temperature of the bearing monitoring component or the roller bearing has been exceeded, which can already indicate whether the roller bearing is slightly or severely overheated or not.

According to a further embodiment, it is provided that the at least one indicator temperature indicates the temperature of the bearing monitoring component from which the indicator substance concentration measured by the gas sensor for the respective indicator substance reaches or exceeds a specified indicator substance concentration threshold value, so that the degree of overheating of the rolling bearing follows from reaching or exceeding the at least one indicator substance concentration threshold value.

Advantageously, a sensitivity of the gas sensor can also be adjusted during the evaluation of the detection result, so that a corresponding detection result is only output from one or more specific indicator substance concentration threshold value(s), from which a specific degree of overheating for the roller bearing follows. As a result, an at least rough subdivision of the degrees of overheating considered in each case can also be made. For example, an indicator substance that is already present in very small quantities at low temperatures of the bearing monitoring component (low degree of overheating) and which may not yet be reliably or consistently detected and its indicator substance concentration at high temperatures of the bearing monitoring component (high degree of overheating) increases very sharply, can also be used to determine the degree of overheating of the rolling bearing. This makes the detection more flexible since, in order to determine the degree of overheating of the roller bearing, one or more specified detection limits for the respective indicator substance must or must be exceeded. The indicator temperature assigned to the respective indicator substance and/or the respective indicator substance concentration threshold value can preferably be determined in advance and stored so that it can be easily accessed during operation.

According to a further embodiment, it is preferably provided that the temperature of the bearing monitoring component is estimated from the indicator substance concentration of a detected indicator substance, which is contained in the detection result, and the degree of overheating of the roller bearing is determined as a function of this estimated temperature of the bearing monitoring component. wherein the connection between the determined indicator substance concentration of a detected indicator substance and the temperature of the bearing monitoring component is preferably determined in advance and stored, for example in a characteristic curve or a lookup table. This enables an exact, more fine-grained estimation of the temperature of the roller bearing and thus of the degree of overheating via the measured indicator substance concentration.

Provision is preferably also made for the degree of overheating of a roller bearing to be determined as a function of the temperature range in which the temperature of the bearing monitoring component lies, which is derived from the indicator substance concentration and/or from the indicator temperature. Temperature ranges can therefore preferably be defined in advance for which the degree of overheating of a roller bearing is known, so that the degree of overheating can be determined easily.

• - ein nullter Überhitzungsgrad für das jeweilige Wälzlager ermittelt wird, wenn die Temperatur des Lager-Überwachungsbauteils in einem ersten, unkritischen Temperatur-Bereich liegt, wobei der erste unkritische Temperatur-Bereich beispielsweise bei kleiner gleich 100°C (je nach verwendetem Wälzlager) liegt, wobei das jeweilige Wälzlager bei einem Ermitteln des nullten Überhitzungsgrades nicht überhitzt ist, und/oder
• - ein erster Überhitzungsgrad für das jeweilige Wälzlager ermittelt wird, wenn die Temperatur des Lager-Überwachungsbauteils in einem zweiten, vorkritischen Temperatur-Bereich liegt, wobei der zweite, vorkritische Temperatur-Bereich beispielsweise zwischen 101°C und 120°C (je nach verwendetem Wälzlager) liegt, wobei das jeweilige Wälzlager bei einem Ermitteln des ersten Überhitzungsgrades schwach überhitzt ist, und/oder
• - ein zweiter Überhitzungsgrad für das jeweilige Wälzlager ermittelt wird, wenn die Temperatur des Lager-Überwachungsbauteils in einem dritten, kritischen Temperatur-Bereich liegt, wobei der dritte, kritische Temperatur-Bereich vorzugsweise oberhalb von 120°C (je nach verwendetem Wälzlager) liegt, wobei das jeweilige Wälzlager bei einem Ermitteln des zweiten Überhitzungsgrades stark überhitzt ist.

For example, it can be provided that

• - a zero degree of overheating is determined for the respective roller bearing if the temperature of the bearing monitoring component is in a first, non-critical temperature range, the first non-critical temperature range being, for example, less than or equal to 100°C (depending on the roller bearing used), wherein the respective roller bearing is not overheated when the zeroth degree of overheating is determined, and/or
• - a first degree of overheating is determined for the respective roller bearing if the temperature of the bearing monitoring component is in a second, pre-critical temperature range, with the second, pre-critical temperature range being between 101°C and 120°C, for example (depending on the roller bearing used ) is, wherein the respective roller bearing is slightly overheated when determining the first degree of overheating, and / or
• - a second degree of overheating is determined for the respective roller bearing if the temperature of the bearing monitoring component is in a third, critical temperature range, the third, critical temperature range preferably being above 120° C. (depending on the roller bearing used), wherein the respective roller bearing is severely overheated when the second degree of overheating is determined.

A rough subdivision of the degree of overheating can already be made with these three temperature ranges, this being derived from the presence of an indicator substance and/or the indicator substance concentration of the indicator substance can. However, depending on the application, a finer subdivision can also be provided.

It can preferably also be provided that the degree of overheating, which is derived from the indicator substance concentration of a specific indicator substance, is checked for plausibility with the degree of overheating, which is derived from the indicator temperature of the same or another indicator substance. As a result, the degree of overheating can be determined more reliably and deviations can be detected.

It is preferably also provided that the at least one indicator substance can only be detected in the sensor environment when the first degree of overheating and/or the second degree of overheating is present (and not otherwise, e.g. in the zeroth degree of overheating). As a result, in an advantageous variant, it is possible to unequivocally conclude that there is slight and/or severe overheating as soon as the indicator substance has been detected in the sensor environment, or that there is no overheating if the detection has not just taken place.

According to a preferred development, it is also provided that a bearing-specific indicator substance, e.g. a fragrance, is used as the indicator substance, with the bearing-specific indicator substance being characterized in that it is also specifically incorporated into the respective bearing monitoring component, e.g a cover disk of the roller bearing and/or in lubricating grease of the roller bearing. As a result, a gaseous substance can be used as the indicator substance, which is only separated from the rolling bearing and from no other component at the relevant degrees of overheating, so that if the indicator substance is detected in the sensor environment, it can be assumed with a high degree of probability that it comes from the rolling bearing . In addition or as an alternative, the indicator substance can also be a natural component of the respective bearing monitoring component or can occur conventionally therein.

• - einem oder mehreren im Betrieb rotierenden Wälzlagern zum Lagern einer Maschinenkomponente, insbesondere einer Rolle oder einer Walze, wobei das mindestens eine Wälzlager mindestens ein Lager-Überwachungsbauteil, beispielsweise eine Abdeckscheibe des Wälzlagers oder Schmierfett des Wälzlagers, aufweist, wobei das Lager-Überwachungsbauteil ausgebildet ist, temperaturabhängig einen Indikatorstoff auszusondern, und
• - einer erfindungsgemäßen Auswerteeinheit, wobei die Auswerteeinheit mit einem Gassensor, insbesondere einem Molekülmassen-Sensor, signalleitend verbunden ist,

wobei der Gassensor ausgebildet ist, gasförmige Stoffe in einer Sensorumgebung zu erfassen, wobei der Gassensor derartig an der landwirtschaftlichen Maschine angeordnet ist, dass der Gassensor von den Wälzlagern ausgesonderte gasförmige Stoffe, insbesondere die Indikatorstoffe, detektieren kann.The evaluation unit according to the invention for carrying out the method according to the invention is designed to record a detection signal from a gas sensor, in particular a molecular mass sensor. According to the invention, an agricultural machine, in particular a combine harvester or a baling press, which can be operated autonomously or manually, is also provided

• - one or more roller bearings rotating during operation for supporting a machine component, in particular a roller or a roller, the at least one roller bearing having at least one bearing monitoring component, for example a cover disk of the roller bearing or lubricating grease of the roller bearing, the bearing monitoring component being formed , separating out an indicator substance depending on the temperature, and
• - an evaluation unit according to the invention, the evaluation unit being connected to a gas sensor, in particular a molecular mass sensor, in a signal-conducting manner,

wherein the gas sensor is designed to detect gaseous substances in a sensor environment, wherein the gas sensor is arranged on the agricultural machine in such a way that the gas sensor can detect gaseous substances separated by the roller bearings, in particular the indicator substances.

Provision is preferably made for one or more roller bearings to be assigned to a gas sensor in such a way that the gas sensor can detect gaseous substances separated out by the one assigned roller bearing or by the several assigned roller bearings, in particular the indicator substances. Accordingly, several roller bearings can also be combined into a cluster, so that a gas sensor is not required for each roller bearing. The roller bearings are then to be arranged according to the respectively assigned gas sensor. In addition, different indicator substances can also be used in the respective clusters.

It can preferably be provided that the gas sensor is arranged adjacent to the respective roller bearing and/or air ducts are arranged between the respective roller bearing and the gas sensor assigned to it in such a way that an air flow containing the gaseous substances can reach the sensor environment of the gas sensor. In this way it can be ensured in a simple manner that indicator substances separated out by the respective roller bearing can safely reach the respective gas sensor.

According to the invention, a method for controlling an agricultural machine according to the invention as a function of a degree of overheating of a roller bearing determined according to the method according to the invention is provided, with an action being carried out automatically or autonomously depending on the degree of overheating of the respective roller bearing, which action is selected from the group consisting of: Adapting a driving dynamics of the agricultural machine, controlling an optical and/or acoustic and/or haptic notification device, for example a display, controlling an automatic extinguishing system. In this way, the detection of a specific degree of overheating can also be adequately rea be averted, this being done by automatically activating the brake/drive/steering system and/or by notifying the driver and/or by attempting to minimize the current danger.

Provision can preferably be made for the driving dynamics to be adapted as a function of a change in substance concentration for the respective indicator substance. Accordingly, a change in the degree of overheating is also considered and, depending on this, reacted appropriately.

• 1 eine schematische Ansicht eines Mähdreschers als landwirtschaftliche Maschine;
• 2 eine schematische Ansicht einer Ballenpresse als landwirtschaftliche Maschine;
• 3 eine schematische Ansicht eines Zustands-Überwachungssystems für ein Lager in den landwirtschaftlichen Maschinen gemäß 1 oder 2; und
• 4 ein Flussdiagramm eines erfindungsgemäßen Verfahrens.

The invention is explained in more detail below using an exemplary embodiment. Show it:

• 1 a schematic view of a combine harvester as an agricultural machine;
• 2 a schematic view of a baler as an agricultural machine;
• 3 FIG. 12 is a schematic view of a condition monitoring system for a bearing in the agricultural machinery of FIG 1 or 2 ; and
• 4 a flowchart of a method according to the invention.

In 1 is a combine harvester 1a as an agricultural machine 1 and in 2 a baler 1b is shown as an agricultural machine 1, with several rollers 2, for example deflection rollers or drive rollers for a conveyor belt, or rollers, or similar, inside the combine harvester 1a or the baler 1b, which are used to move the agricultural material along a To promote conveying path F within the agricultural machine 1 and / or to edit it accordingly. The rollers 2 or rollers have roller bearings 3, in particular ball bearings 3a or tapered roller bearings 3b or spherical roller bearings 3c, in order to enable the rollers 2 or rollers to rotate.

Each ball bearing 3a has as in 3 shown in detail as rolling elements on several balls 4, which are held in an inner space 5 between an outer ring 6 and an inner ring 7, for example cage-guided. To protect the interior 5 from dust and to seal the interior 5, there is a full-circumference on both sides of the ball bearing 3a between the two rings 6, 7 (cut out in 3 ) a cover plate 8 is provided. This cover disk 8 is preferably made of plastic or rubber or metal (or combinations thereof) or a material that is designed to separate at least one first indicator substance 20a as a function of temperature.

Furthermore, there is lubricating grease 9 (liquid grease) in the interior 5 on the balls 4 and/or on the outer ring 6 and/or on the inner ring 7 , which is intended to improve the running properties of the balls 4 in the interior 5 . The lubricating grease 9 is made from a viscous material which is designed to secrete at least one second indicator substance 20b as a function of temperature. Graphite grease, for example, can be used as lubricating grease 9 (liquid grease). However, other fats are also possible.

• In der jeweiligen landwirtschaftlichen Maschine 1, in der das oben beschriebene Wälzlager 3 ein oder mehrfach vorgesehen ist, ist als Bestandteil einer Zustands-Überwachungseinrichtung 10 mindestens ein Gassensor 11, insbesondere ein Molekülmassen-Sensor 11a, beispielsweise ein QCM-Sensor (Quartz Crystal Microbalance) eingebaut. Mit diesem Gassensor 11 können in einem ersten Schritt ST1 (s. 4) eines erfindungsgemäßen Verfahrens selektiv unterschiedliche gasförmige Stoffe Sn in einer Sensorumgebung U (lediglich ausschnitthaft in 1, 2) des Gassensors 11 detektiert werden. Jeder Gassensor 11 der Zustands-Überwachungseinrichtung 10 ist dabei derartig an der landwirtschaftlichen Maschine 1 angeordnet, dass dessen Sensorumgebung U zumindest ein Wälzlager 3 in der landwirtschaftlichen Maschine 1 abdeckt. Dabei kann wie dargestellt auch vorgesehen sein, dass sich mehrere Wälzlager 3 in der Sensorumgebung U eines Gassensors 11 befinden, so dass mehrere Wälzlager 3 zu einem Cluster zusammengefasst sind bzw. einem Gassensor 11 mehrere Wälzlager 3 zugeordnet werden.

Both the lubricating grease 9 and the cover disc 8 can be used as a bearing monitoring component 30 as follows due to their property of releasing the respective indicator substance 20a, 20b as a gaseous substance Sn depending on their temperature T8, T9:

• In the respective agricultural machine 1, in which the rolling bearing 3 described above is provided one or more times, at least one gas sensor 11, in particular a molecular mass sensor 11a, for example a QCM sensor (quartz crystal microbalance) is part of a condition monitoring device 10 built-in. With this gas sensor 11, in a first step ST1 (see 4 ) of a method according to the invention selectively different gaseous substances Sn in a sensor environment U (only excerpts in 1 , 2 ) of the gas sensor 11 can be detected. Each gas sensor 11 of the condition monitoring device 10 is arranged on the agricultural machine 1 in such a way that its sensor environment U covers at least one roller bearing 3 in the agricultural machine 1 . As shown, it can also be provided that several roller bearings 3 are located in the sensor environment U of a gas sensor 11 , so that several roller bearings 3 are combined into a cluster or several roller bearings 3 are assigned to one gas sensor 11 .

The arrangement of the gas sensor 11 should preferably be selected in such a way that individual gaseous substances Sn released by the rolling bearing 3, in particular the indicator substances 20a, 20b released by the respective bearing monitoring component 30, can also get into the sensor environment U of the respective gas sensor 11 during use . The gas sensor 11 or the sensor environment U should therefore lie in an air flow 12 in which the gaseous substances Sn released by the roller bearing 3 also move during normal operation of the agricultural machine 1 . In order to achieve this, an arrangement of the gas sensor 11 close to the bearing is suitable. In addition, air ducts 13 can also be attached, which direct an air flow 12 to the gas sensor or sensors 11 can conduct. In addition, the air flow 12 can also be generated artificially and aligned with the respective gas sensor 11 .

Each gas sensor 11 is connected to an evaluation unit 14 (wired or wireless), which is designed to record and analyze a detection signal SD emitted by the gas sensor 11 . The detection signal SD is dependent on the gas detected in each case or the respective gaseous substance Sn in the sensor environment U. Due to the arrangement close to the bearing, conclusions can also be drawn from the detection signal SD about gaseous substances Sn that are caused by the rolling bearing(s) 3 are released, which are assigned to the respective gas sensor 11. Depending on the gas sensor 11, both the presence or the pure detectability of a specific gaseous substance Sn, in particular an indicator substance 20a, 20b from the bearing monitoring component 30, and a substance concentration KSn of the respective gaseous substance Sn and thus also a substance -Concentration change dKSn can be determined.

This enables a time-resolved monitoring of the operating state in which the respective roller bearing 3 is currently being operated or in which temperature range Bk, with k=1, 2, 3, . . . the temperature T8, T9 of the cover disk 8 or the lubricating grease 9 or generally the temperature T30 of the bearing monitoring component 30, is approximately. From these temperatures T30; T8, T9, a temperature T3 of the roller bearing 3 can be estimated, the temperature T3 of the roller bearing 3 approximately corresponding to the temperature T8, T9 of the cover disk 8 or of the lubricating grease 9. From this, in turn, it follows whether and/or to what extent the roller bearing 3 has overheated and could possibly cause a fire in the adjacent agricultural property, this being indicated by an overheating degree Gp; with p=0.1, 2, ... of the rolling bearing 3 is given.

The respective temperature T3, T30; T8, T9 direct measuring sensor used. Rather, in a second step ST2 of the method according to the invention, the evaluation unit 14 uses the detection signal SD to check whether the above-mentioned indicator substances 20a, 20b of the bearing monitoring components 30 can be detected among the detected gaseous substances Sn.

It is preferably provided that the material of the bearing monitoring components 30 is selected in such a way that the released indicator substances 20a, 20b can be clearly assigned to the bearing monitoring components 30 and thus to the roller bearing 3 and these indicator substances 20a, 20b ideally not also from other components of the agricultural machine 1 are discarded. Accordingly, bearing-specific indicator substances 20a, 20b are used, whereby these can also differ, for example, for different clusters of roller bearings 3, so that when the respective indicator substance 20a, 20b is detected, a targeted assignment to a cluster can also take place. For this purpose, the cover disc 8 and/or the lubricating grease 9 can be given certain fragrances, which, for example, have a clearly detectable ammonia compound or vinegar essences or certain distinctive aromas (e.g. onion or lemon).

In principle, however, conventional gaseous substances Sn can also be used as indicator substances 20a, 20b, which are released during or shortly before overheating of the roller bearing 3, e.g. when plastic (cover disks 8) melts or when viscous material (lubricating grease 9) is heated, for example benzene and/or paraffin and/or hydrochloric acid.

During normal operation of the agricultural machine 1, the roller bearings 3 heat up to a temperature T3 of up to approx possible are. In this case, the roller bearing 3 is not overheated, which in the present case corresponds to a zeroth degree of overheating G0. In this non-critical first temperature range B1, the respective roller bearing 3 is operated with the zero degree of overheating G0 in a non-critical operating state. In this non-critical operating state, it is not possible or improbable that the agricultural material being conveyed or processed near the store will ignite due to a roller bearing 3 that has become too hot.

However, if certain basic conditions are present, it can happen that one or more roller bearings 3 of the agricultural machine 1 are operated in a second, pre-critical or in a third, critical temperature range B2, B3. In these temperature ranges B2, B3, the assumed temperature T3 of the respective roller bearing 3 or the temperature T30 of the respective bearing monitoring component 30 indicates that a slightly overheated roller bearing 3 with a first degree of overheating G1 or a heavily overheated roller bearing 3 with a second degree of overheating G2. These temperature ranges B2, B3 are defined in such a way that ignition of the agricultural material being conveyed or processed close to the store by a roller bearing 3 that has become too hot will possibly (B2; G1) or definitely (B3; G2) occur. The temperature ranges Bk and the degrees of overheating Gp can also be subdivided more finely.

A slightly overheated or severely overheated roller bearing 3 can exist, for example, when components of the roller bearing 3 no longer behave correctly, e.g. due to a dirty or defective roller bearing 3, and therefore the rolling friction increases sharply, or if the roller bearing 3 passively from the outside the environment is overheated. In this case, the temperature T3 of the roller bearing 3 can fall into the second, pre-critical temperature range B2, for example between 101° C. and 120° C. (slightly overheated), or into the third, critical temperature range B3, for example above 120° C (severely overheated), increase. Consequently, the temperatures T30 also increase; T8, T9, of the respective bearing monitoring component 30 (cover disk 8, lubricating grease 9). Depending on the structure and design of the roller bearing 3, however, other temperature ranges B1, B2, B3 can also be defined, with the person skilled in the art adapting them accordingly when reading the data sheet of the respective roller bearing 3, in which the temperature application range is named.

As a result of this increase in temperature of the roller bearing 3, there is increased exposure to different gaseous substances Sn, n=1, 2, 3 . . can be perceived. The type of gaseous substances Sn released is dependent on the respective bearing monitoring component 30 or the materials used.

The materials change in particular in the respective bearing monitoring component 30 in such a way that from certain temperatures T30; T8, T9 gaseous substances Sn are more easily or increasingly released or separated, which otherwise occur at low temperatures T30; T8, T9 are firmly integrated into the material and are therefore not perceptible from the outside. Therefore, the type and a substance concentration KSn of the released gaseous substances Sn are also dependent on the temperature T30; T8, T9. In this way, at least some of the separated gaseous substances Sn, which have a dependence on the temperature T30; T8, T9 of the respective bearing monitoring component 30 can be used as indicators to determine whether a roller bearing 3 is in a pre-critical operating state (slightly overheated) or in a critical operating state (severely overheated) or in the pre-critical or critical temperature range B2 , B3 is operated.

These indicators or the indicator substances 20a, 20b are distinguished, for example, in that an indicator temperature TI can be assigned to them, from which these indicator substances 20a, 20b can be detected by the respective bearing monitoring component 30; 8, 9 are demonstrably released and can therefore be detected at all by the gas sensor 11. According to one embodiment, the detection signal SD can only be monitored for the presence or the detectability of a specific indicator substance 20a, 20b as a gaseous substance Sn. If only the presence of an indicator substance 20a, 20b is to be checked, indicator substances 20a, 20b must be used for reliable determination of a pre-critical and/or a critical temperature range B2, B3, which are correspondingly only in the pre-critical or in the critical temperature range B2, B3 are discarded by the respective bearing monitoring component 30.

It can also be provided, for example, that the first indicator substance 20a in the cover disk 8 of the roller bearing 3 has an indicator temperature TI that is in the pre-critical temperature range B2, so that the first indicator substance 20a, for example, only shows a slight overheating (first Degree of overheating G1) of the rolling bearing 3 exits. The second indicator substance 20b in the lubricating grease 9 of the roller bearing 3, on the other hand, can have an indicator temperature TI that lies in the critical temperature range B3, so that the second indicator substance 20b, for example, only appears if the roller bearing 3 exit.

However, one indicator substance 20a, 20b can also be assigned one or more indicator temperatures TI as a function of an indicator substance concentration threshold value WKSI. If an indicator substance concentration KSI determined by the gas sensor 11, i.e. the substance concentration KSn of a specific indicator substance 20a, 20b, exceeds the respectively specified indicator substance concentration threshold value WKSI, the indicator substance 20a, 20b is additionally detected for the respectively associated indicator temperature TI. As a result, further subdivisions can be made, particularly within the pre-critical or the critical temperature range B2, B3, even with the detection of a single indicator substance 20a, 20b for different indicator temperatures TI.

It is advantageous here if any indicator temperatures TI assigned to an indicator substance 20a, 20b are in the pre-critical or in the critical temperature range B2, B3, since these are primarily to be detected. If there is nothing to indicate that these indicator temperatures TI have been exceeded, it can be automatically concluded that the roller bearing 3 is at zero overheating G0 and thus that there is no overheating. If the respective indicator substance 20a, 20b is additionally not detected at all in the non-critical temperature range B1 by the respective bearing monitoring component 30 released, this cannot be detected by the gas sensor 11 and the zeroth degree of overheating G0 or no overheating can be inferred from this.

Depending on this substance-selective detection of a specific indicator substance 20a, 20b, a detection result D can be output in a third step ST3. In this embodiment, this indicates in particular that a specific indicator substance 20a, 20b could be detected for the indicator temperature TI assigned to it (ST3.1). It then also follows from the detection result D that the temperature T30; T8, T9 of the respective bearing monitoring component 30 has reached or exceeded the correspondingly assigned indicator temperature TI. Accordingly, there is a high probability that the roller bearing 3 as a whole has reached or exceeded this indicator temperature TI.

This can then be used, for example, to classify the temperature ranges B1, B2, B3 mentioned above, with a pre-critical or critical temperature range B2, B3 preferably being present when the at least one indicator temperature TI is reached or exceeded, and when it falls below it the non-critical temperature range B1. Accordingly, the rolling bearing 3 is slightly (G1, B2), severely (G2, B3) or not (G0, B1) overheated. At least the precritical and the critical temperature range Bk, k=2, 3, .

If there are several such indicator substances 20a, 20b, the detection result D can also be used to output the detection (or non-detection) of further indicator substances 20a, 20b, so that it is also possible to use several indicator temperatures TI accordingly, for example in order to achieve a more reliable classification into the temperature ranges Bk. The indicator temperature TI of the respective indicator substances 20a, 20b can be determined in previous tests and stored in the evaluation unit 14.

In a fourth step ST4, the detection result D can be used - via the indicator temperature TI and/or the respective temperature range Bk - to directly infer the degree of overheating Gp of the respective roller bearing 3 and thus whether the neighboring agricultural item is ignited due to a slightly or severely overheated rolling bearing 3 is likely or not. The ascertained degree of overheating Gp and/or the respective temperature range Bk can also be shown to the driver (if present) on a display 16 so that he can react accordingly.

According to a further embodiment, the indicator substance concentration KSI of a specific detected indicator substance 20a, 20b can also be analyzed directly in the evaluation unit 14 without determining one or more indicator temperatures Ti in an intermediate step. A detected indicator substance 20a, 20b can, for example, also directly be associated with a preferably continuous relationship between the respective indicator substance concentration KSI and the temperature T30; T8, T9 of the respective bearing monitoring component 30; 8, 9 assigned, which can be determined beforehand and stored in a characteristic curve or a lookup table, for example. In this embodiment, it is then possible to fine-tune the indicator substance concentration KSI directly to the temperature T30; T8, T9 of the respective bearing monitoring component 30; 8, 9 and indirectly also the temperature T3 of the rolling bearing 3 are closed, it being assumed that with increasing temperature T30; T8, T9 of the respective bearing monitoring component 30; 8, 9 the indicator substance concentration KSI also increases.

In this embodiment, the detection result D output in the third step ST3 does not indicate that an indicator temperature TI has been reached and the respective indicator substance 20a, 20b is present (cf. ST3.1), but how much of a specific indicator substance 20a, 20b could be detected (ST3.2), from which the temperature T30; T8, T9 of the respective bearing monitoring component 30; 8, 9 follows. From this, the temperature T3 of the roller bearing 3 can be estimated as a whole. From this, for example, taking into account the corresponding temperature ranges Bk in the fourth step ST4, the degree of overheating Gp of the respective roller bearing 3 can be inferred. The determined degree of overheating Gp and/or the respective temperature range Bk can also be shown to the driver (if present) on a display 16 so that he can react accordingly.

In the method according to the invention, the degree of overheating Gp of the roller bearing 3 can therefore be determined generally via an indicator substance 20a, 20b, for which it is at least within the precritical and/or the critical temperature range B2, B3 with regard to its detectability at specific indicator temperatures TI (step ST3.1) and/or with regard to its indicator substance concentration KSI a connection with the temperature T30; T8, T9 of the respective bearing monitoring component 30; 8, 9 there.

In addition, both versions for determining the detection result D can also be used for a plausibility check if, for example, the indicator temperature TI associated with a specific detected indicator substance 20a, 20b is the temperature T30; T8, T9 of the respective bearing monitoring component 30; 8, 9 is compared, which is derived from the indicator substance concentration KSI of an indicator substance 20a, 20b that has also been detected, for example also of another indicator substance 20a, 20b of the same or another storage monitoring component 30; 8, 9, follows.

• Wird die landwirtschaftliche Maschine 1 beispielsweise autonom mit einer höheren Autonomiestufe betrieben, für die ein Fahrer zur ständigen Überwachung nicht anwesend oder nicht ständig aufmerksam sein muss, so kann eine Fahrdynamik FD der landwirtschaftlichen Maschine 1 in Abhängigkeit des Steuersignals SA automatisiert bzw. autonom angepasst werden. Dazu kann ein automatisierter Eingriff in das Bremssystem 25 und/oder das Antriebssystem 26 und/oder das Lenksystem 27 der autonom betriebenen landwirtschaftlichen Maschine 1 vorgesehen sein. Dadurch kann eine Geschwindigkeit vlst der autonom betriebenen landwirtschaftlichen Maschine 1 reduziert bzw. angepasst werden und die landwirtschaftliche Maschine 1 gleichzeitig an eine sichere Position P gefahren werden, in der bei einem schwach oder stark überhitzten Wälzlager 3 die Gefahr eines größeren durch das jeweils überhitzte Wälzlager 3 verursachten Brandes minimiert wird.

Depending on the degree of overheating Gp of the roller bearing 3 determined in the fourth step ST4 and/or the temperature T30 determined; T8, T9 for the stock monitor member 30; 8, 9 and/or the determined temperature range Bk, a control signal SA can then be output, which can be used in a control method according to the invention. The control signal SA is used to control the agricultural machine 1 according to the present temperature T30; T8, T9 of the respective bearing monitoring component 30; 8, 9 or the degree of overheating Gp of the roller bearing 3 to control. The control signal SA can be used in different ways depending on the application:

• For example, if the agricultural machine 1 is operated autonomously with a higher level of autonomy, for which a driver does not have to be present or constantly alert for constant monitoring, then a driving dynamics FD of the agricultural machine 1 can be adjusted automatically or autonomously depending on the control signal SA. For this purpose, an automated intervention in the braking system 25 and/or the drive system 26 and/or the steering system 27 of the autonomously operated agricultural machine 1 can be provided. As a result, a speed vlst of the autonomously operated agricultural machine 1 can be reduced or adjusted and the agricultural machine 1 can be driven to a safe position P at the same time, in which, with a slightly or severely overheated roller bearing 3, there is a risk of a greater caused fire is minimized.

For example, it can be provided that an autonomously operated agricultural machine 1, when the first degree of overheating G1 and/or the second degree of overheating G2 or a pre-critical or critical temperature range B2, B3 of the roller bearing 3 is present, depends on the control signal SA as far as possible on the field that has already been harvested is driven in order not to endanger the harvest from a possible fire. The agricultural machine 1 could also be driven to the edge of the field to simplify firefighting. In addition or as an alternative, an automatic extinguishing system 15 can be controlled by the control signal SA in this case.

The automated control can also be carried out in such a way that, for example, if the pre-critical temperature range B2 or the first degree of overheating G1 is present, only a preparatory intervention in the driving dynamics FD takes place and at the same time a warning is issued, e.g. via the visual and/or acoustic and / or haptic indication device 16, and / or via the automatic extinguishing system 15 cooling of the roller bearing 3 already takes place. In addition, in the precritical temperature range B2 or the first degree of overheating G1, a reduction in power can already be provided in order to stress the roller bearing 3 less and thus prevent the slight overheating of the roller bearing 3 from increasing further.

In addition, the substance concentration change dKSn can be used. If this rises sharply for an indicator substance 20a, 20b, for example, it can be expected that the respective temperature T30; T8, T9 for the stock monitor member 30; 8, 9 could soon enter the third critical temperature range B3 with strong overheating, so that a further increase in the temperature T30; T8, T9 for the stock monitor member 30; 8, 9 or the roller bearing 3 is prevented or weakened. The control signal SA can therefore also be adjusted accordingly as a function of the change in substance concentration dKSn for the indicator substance 20a, 20b.

If a driver is present and alert in vehicle 1, a display 16a can also be controlled depending on the control signal SA (or the temperature range Bk or the degree of overheating Gp), on which the driver can see the respective degree of overheating Gp of the respective roller bearing 3 and/or the temperature range Bk and/or the respective temperature T3, T30; T8, T9 is shown. A representation can only be given for the first degree of overheating G1 or pre-critical temperature range B2 and for the second degree of overheating G2 or critical temperature range B3 or only for certain temperatures T3, T30; T8, T9 can be provided so that the driver can react accordingly independently. The substance concentration change dKSn of the respective indicator substance 20a, 20b can also be taken into account. In addition or as an alternative, others can also optical and/or acoustic and/or haptic indication devices 16 can be activated as a function of the control signal SA.

In the case of a baler 1b as an agricultural machine, a trailer actuator 17 can also be activated as a function of the control signal SA, whereupon a drawbar support 18 of the baler 1b is automatically extended and/or a hitch 19 on the respective towing vehicle (tractor) is automatically opened. This allows the baler 1b to be automatically uncoupled in the event of an (imminent) fire, e.g. severe overheating (G2, B3), so that the fire does not spread to the towing vehicle.

Reference List

1

agricultural machine

1a

Harvester

1b

baler

2

role

3

roller bearing

3a

ball-bearing

3b

tapered roller bearing

3c

Barrel Bearing

4

bullet

5

inner space

6

outer ring

7

inner ring

8th

cover disc

9

grease

10

condition monitor

11

gas sensor

11a

molecular mass sensor

12

airflow

13

air duct

14

evaluation unit

15

automatic extinguishing system

16

notification facility

16a

screen

17

trailer actuators

18

drawbar support

19

hitch

20a

first indicator substance

20b

second indicator substance

25

braking system

26

drive system

27

steering system

30

Bearing monitoring component

bk

k. temperature range

dKSn

Substance concentration change

D

detection result

f

conveyor path

FD

driving dynamics

gp

p. degree of overheating

KSn

substance concentration

ASI

tracer concentration

P

safe position

SA

control signal

SD

detection signal

sn

n. gaseous substance

T3

Bearing temperature 3

T8

Cover plate temperature 8

T9

Grease temperature 9

T30

Bearing monitor temperature 30

ti

indicator temperature

maybe

speed

WKSI

Tracer concentration threshold

ST1, ST2, ST3, ST3.1, ST3.2, ST4

steps of the procedure

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was 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.

Patent Literature Cited

• DE 202006001705 U1 [0004, 0011, 0013]
• CN 206339536 U [0005]
• JP 3006629 B2 [0005]
• US2011089255A1 [0005]
• US10118577B1 [0005]
• KR 100559320 B1 [0006]
• DE 102018116282 A1 [0006]

Claims (20)

Method for detecting overheating of a roller bearing (3) of an agricultural machine (1) using at least one gas sensor (11) arranged in the agricultural machine (1), the roller bearing (3) having at least one bearing monitoring component (30). at least the following steps: - Detecting gaseous substances (Sn; n=1,2,3,...) in a sensor environment (U) of the gas sensor (11) (ST1); - Determine whether in the sensor environment (U) of the gas sensor (11) as a gaseous substance (Sn) at least one indicator substance (20a, 20b) can be detected (ST2), the at least one indicator substance (20a, 20b) depending on a temperature (T3) of the rolling bearing (3) is separated from the at least one bearing monitoring component (30) of the rolling bearing (3); - Creating a detection result (D) if an indicator substance (20a, 20b) in the sensor environment (U) can be detected (ST3); and - Determining and/or outputting a degree of overheating (Gp; p=0, 1, ,2, ..) of the respective roller bearing (3) as a function of the detection result (D) (ST4), the degree of overheating (Gp) indicating whether and /or how much the respective roller bearing (3) is overheated. procedure after claim 1 , characterized in that the detection result (D) includes - that an indicator substance (20a, 20b) in the sensor environment (U) is detected (ST3.1), and / or - an indicator substance concentration (KSI) in the sensor environment (U) detected indicator substance (20a, 20b) (ST3.2). procedure after claim 2 , characterized in that the degree of overheating (Gp) of the roller bearing (3) is determined, - as a function of at least one indicator temperature (TI), with each indicator substance (20a, 20b) being assigned at least one indicator temperature (TI), and /or - as a function of the indicator substance concentration (KSI) of the indicator substance (20a, 20b) detected in the sensor environment (U). procedure after claim 3 , characterized in that the indicator temperature (TI) indicates from which temperature (T30) of the bearing monitoring component (30) the respective indicator substance (20a, 20b) can be detected by the gas sensor (11), so that the degree of overheating (Gp ) of the roller bearing (3) as a function of the indicator temperature (TI) assigned to the respective indicator substance (20a, 20b) is determined if it follows from the detection result (D) that an indicator substance (20a, 20b) in the sensor environment (U) is present (ST3.1). procedure after claim 3 or 4 , characterized in that the at least one indicator temperature (TI) indicates the temperature (T30) of the bearing monitoring component (30) from which the gas sensor (11) measured indicator substance concentration (KSI) for the respective indicator substance (20a, 20b) reaches or exceeds a specified indicator substance concentration threshold value (WKSI), so that the degree of overheating (Gp) of the roller bearing (3) follows from reaching or exceeding the at least one indicator substance concentration threshold value (WKSI). Procedure according to one of claims 3 until 5 , characterized in that from the indicator substance concentration (KSI) of a detected indicator substance (20a, 20b), which is contained in the detection result (D), the temperature (T30) of the bearing monitoring component (30) is estimated (ST3.2 ) and the degree of overheating (Gp) of the roller bearing (3) as a function of this estimated temperature (T30) of the bearing monitoring component (30) is determined, with the relationship between the determined indicator substance concentration (KSI) of a detected indicator substance (20a, 20b) and the temperature (T30) of the bearing monitoring component (30) is preferably determined in advance and stored. Procedure according to one of Claims 4 until 6 , characterized in that the degree of overheating (Gp) of a roller bearing (3) is determined as a function of the temperature range (Bk) in which the temperature (T30) of the bearing monitoring component (30) lies, which is derived from the indicator substance concentration ( KSI) and/or derived from the indicator temperature (TI). procedure after claim 7 , characterized in that the degree of overheating (Gp), which is derived from the indicator substance concentration (KSI) of an indicator substance (20a, 20b) separated out from a bearing monitoring component (30), is checked for plausibility with the degree of overheating (Gp) which is the indicator temperature (TI) of the same or another indicator substance (20a, 20b) is derived, the indicator substance (20a, 20b) being discarded from the same or another storage monitoring component (30). procedure after claim 7 or 8th , characterized in that - a zeroth degree of overheating (G0) for the respective roller bearing (3) is determined when the temperature (T30) of the bearing monitoring component (30) is in a first, non-critical temperature range (B1), wherein the first non-critical temperature Area (B1) is preferably less than or equal to 100°C, the respective roller bearing (3) not being overheated when the zeroth degree of overheating (G0) is determined, and/or - a first degree of overheating (G1) for the respective roller bearing (3) is determined when the temperature (T30) of the bearing monitoring component (30) is in a second, pre-critical temperature range (B2), the second, pre-critical temperature range (B2) preferably being between 101° C. and 120° C , wherein the respective roller bearing (3) is slightly overheated when the first degree of overheating (G1) is determined, and/or - a second degree of overheating (G2) is determined for the respective roller bearing (3) when the temperature (T30) of the bearing Monitoring component (30) is in a third, critical temperature range (B3), wherein the third, critical temperature range (B3) is preferably above 120 ° C, wherein the respective roller bearing (3) when determining the second degree of overheating ( G2) strong is overheated. Procedure according to one of claims 3 until 9 , characterized in that the at least one indicator substance (20a, 20b) can only be detected in the sensor environment (U) when the first degree of overheating (G1) and/or when the second degree of overheating (G2) is present. Method according to one of the preceding claims, characterized in that a bearing-specific indicator substance (20a, 20b) is used as the indicator substance (20a, 20b), the bearing-specific indicator substance (20a, 20b) being added in a targeted manner during or after the manufacture of the roller bearing (3). in the respective bearing monitoring component (30), for example in a cover disc (8) of the roller bearing (3) and/or in lubricating grease (9) of the roller bearing (3), and/or a natural part of the respective bearing monitoring component (30 ) is. Evaluation unit (14) for carrying out a method according to one of the preceding claims, wherein the evaluation unit (14) is designed to record a detection signal (SD) from a gas sensor (11). Agricultural machine (1), in particular a combine harvester (1a) or baler (1b), with - one or more roller bearings (3) rotating during operation, the at least one roller bearing (3) having at least one bearing monitoring component (30), the Bearing monitoring component (30) is designed to separate out an indicator substance (20a, 20b) as a function of temperature, and - an evaluation unit (14). claim 12 , wherein the evaluation unit (14) is connected to a gas sensor (11), in particular a molecular mass sensor (11a), in a signal-conducting manner, the gas sensor (11) being designed to detect gaseous substances (Sn) in a sensor environment (U), wherein the gas sensor (11) is arranged on the agricultural machine (1) in such a way that the gas sensor (11) can detect gaseous substances (Sn), in particular the indicator substances (20a, 20b), separated by the roller bearings (3). Agricultural machine (1) after Claim 13 , characterized in that a gas sensor (11) is assigned one or more roller bearings (3) in such a way that the gas sensor (11) separates out gaseous substances (Sn) from the one assigned roller bearing (3) or from the several assigned roller bearings (3) , In particular the indicator substances (20a, 20b) can detect. Agricultural machine (1) after Claim 14 , characterized in that the one or more gas sensor (11) assigned (s) roller bearing (3) have an indicator substance (20a, 20b) which is clearly assigned to the gas sensor (11). Agricultural machine (1) according to any of Claims 13 until 15 characterized in that the gas sensor (11) is arranged adjacent to the respective roller bearing (3) and/or air ducts (13) are arranged between the respective roller bearing (3) and the gas sensor (11) assigned to it in such a way that the gaseous substances (Sn) containing air flow (12) can get into the sensor environment (U) of the gas sensor (11). Agricultural machine (1) according to any of Claims 13 until 16 , characterized in that the agricultural machine (1) is operated autonomously or manually. Agricultural machine (1) according to any of Claims 13 until 17 , characterized in that the bearing monitoring component (30) is a cover disk (8) of the roller bearing (3) and/or lubricating grease (9) in an interior space (5) of the roller bearing (3). Method for controlling an agricultural machine (1) according to one of Claims 13 until 18 , Depending on a degree of overheating (Gp) of a roller bearing (3) determined by a method according to one of Claims 1 until 11 , wherein depending on the degree of overheating (Gp) of the respective roller bearing (3) an action is automatically carried out that is selected from the group consisting of: Adapting a driving dynamics (FD) of the agricultural machine (1), for example moving the agricultural Machine (1) to a safe position (P) and/or adjusting a speed (vlst) of the agricultural machine (1), activating an optical and/or acoustic and/or haptic indication device (16), for example a display (16a), Controlling an automatic extinguishing system (15). procedure after claim 19 , characterized in that the driving dynamics (FD) depending on a substance concentration change (dKSn) for the respective indicator substance (20a, 20b) is adjusted.

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