Method for operating a soil compacting device, soil compacting device and asphalt roller

Abstract

The invention relates to a method (27) for operating a soil compaction device (10) with a compaction roller (5) rotatably mounted on a support structure (6) and a pavement edge processing device (7) mounted on the support structure (6), comprising an edge processing roller (12), an adjusting arm (18) and an adjusting drive (14), wherein the adjusting drive has a hydraulic cylinder (40), the method (27) comprising at least the steps: adjusting (28) the pavement edge processing device (7) from the end position to the edge processing position; during adjustment, measuring at least one operating parameter of the hydraulic system with the hydraulic cylinder (40) by a sensor device, transmitting the at least one operating parameter of the hydraulic system with the hydraulic cylinder (40) to a detection device; and detecting a state of the edge processing roller (12).The invention also relates to a corresponding soil compaction device and an asphalt roller with the corresponding soil compaction device.

Description

[0001] The invention relates to a method for operating a soil compaction device, a soil compaction device for compacting a subsoil layer, and an asphalt roller.

[0002] Soil compaction devices are frequently used to compact a subgrade layer, such as an asphalt layer or asphalt mat, in road construction or similar applications. These devices all feature a compaction roller mounted on a supporting structure, rotating around a horizontal axis of rotation that runs perpendicular to the direction of travel. This roller has an outer surface that is at least substantially cylindrical and rolls on the subgrade during compaction. Such a compaction roller can be, for example, a rubber wheel in the case of rubber-tired rollers or a so-called roller drum, made of, for example, a steel material and / or a composite material. The roller drum typically comprises a hollow cylindrical drum shell whose outer surface rolls on the subgrade to be compacted.Particularly in road construction, it is common practice for such soil compaction devices to follow a road paver for post-compaction and / or smoothing of an asphalt mat laid by the paver. These are typically self-propelled soil compaction devices, often with two or more such compaction rollers, in the form of rollers, especially articulated or steerable tandem rollers. Rollers of this type are disclosed, for example, in German patent applications DE 10 2018 007 825 A1 and DE 10 2017 011 146 A1.

[0003] Beyond the pure compaction process, further post-processing steps can be provided, either additionally or alternatively, when using such soil compaction devices. These include, for example, the application of grit to increase the skid resistance of the road surface or the defined shaping of the edges of the asphalt layer laid by the preceding paver. The present invention relates to the post-processing of the edges of the laid asphalt mat using a pavement edge-processing device arranged on the supporting structure. Such pavement edge-processing devices serve to achieve a shaping and / or cutting treatment of the edge of the asphalt mat when the soil compaction device passes over it. Specifically, a distinction can be made between so-called edge cutters and edge-pressing devices, both of which, however, have a quite comparable basic design.Essential elements of such a pavement edge-processing device are an edge-processing roller (usually unpowered), an adjustable roller holding device (in particular an adjusting arm), and an adjusting drive. The edge-processing roller can have a significantly smaller diameter than the compaction roller, for example, a diameter less than half the drum diameter, and in particular less than one-third of the drum diameter.

[0004] An edge cutter is specifically designed to cut or separate a strip of asphalt mat, similar to a rotary cutter, and may include a cutting roller. This edge cutting roller can be lowered to the thickness of the asphalt mat and driven through it in a working direction. In contrast, an edge pressing device has a pressing roller that is lowered laterally alongside the asphalt mat to the same thickness, thus pressing the side edge of the asphalt mat and shaping it.

[0005] The edge-working roller, at least in one edge-working position, extends at least partially beyond the front face of the compaction roller (drum) in the direction of the travel axis of rotation, in order to cut and / or compact the subsoil adjacent to the compaction roller, particularly directly adjacent to it in the direction of the travel axis of rotation, during operation. For this purpose, the edge-working roller is adjustable on the adjustable roller holding device between an end position or a transport position that is not in contact with the subsoil and the edge-working position relative to the outer surface of the compaction roller.The end position refers to a position in which the edge-processing roller is flush with the lower apex of the compaction roller's cross-section in the vertical direction, relative to the axis of rotation of the compaction roller, and thus is typically free of contact with the subgrade. The edge-processing position, on the other hand, refers to a position of the edge-processing roller in which it is at least flush with the lower apex of the compaction roller in the vertical direction, or preferably, projects to a defined extent downwards in the vertical direction even beyond the outer surface of the compaction roller, particularly with respect to the lower apex of the outer surface of the compaction roller.It is important to note that there is usually not just one edge-processing position, but rather the edge-processing position is variable within a defined range to allow, for example, adjustments to the respective thickness of the substrate layer. In the edge-processing position, the edge-processing roller cuts into the substrate layer and / or presses it down at the sides to create a uniformly shaped edge of the substrate layer.

[0006] To prevent the operator of such a soil compaction device from having to manually adjust the position of the edge-processing roller every time it changes between the end position and the edge-processing position, the edge-processing roller is preferably mounted on the roller holding device, in particular an adjusting arm, in a way that allows for adjustment by means of an adjusting drive. Such an adjusting drive can, for example, comprise a hydraulic system with a hydraulic cylinder piston unit that includes a hydraulic cylinder.

[0007] Examples of covering edge processing devices are described, for example, in DE 91 11 398 U1, DE 1 939 680 U1, DE 30 20 796 A1, DE 29 27 883 A1 and DE 87 10 179 U1.

[0008] Users of such edge-dressing devices often have to rely solely on visual inspection to determine the device's condition, potentially requiring them to constantly look out from inside the roller to check its position. This is neither ergonomically advantageous nor does it meet the requirements for safety and precision. Therefore, some rollers are equipped with a position sensor for the edge-dressing device, as described, for example, in US Patent US 10,662,590 B1. This sensor measures the distance between the edge-dressing device and the floor. The sensor is mounted externally on the device. However, such a sensor, which only provides the distance value, can report inaccurate data.In the case of an optical sensor, obstacles, contaminants, or poor visibility can distort the sensor's data. Furthermore, the sensor only provides a single distance value; determining the edge-compaction roller position using this single value can lead to reliability and safety issues. These sensors also require adjustment and calibration. This adjustment and calibration process is time-consuming and, during this time, removes the soil compaction equipment from the compaction process, resulting in downtime and waiting periods.

[0009] The known rollers therefore either have the problem that determining the position of the surface edge processing device depends heavily on the experience and motivation of the roller operator, and this also does not comply with any ergonomic guidelines; or that the distance measurement data is based on a sensor whose function depends on various factors.

[0010] Starting from the known state of the art, the invention thus lies in providing a soil compaction device of the generic type and a method for operating it, which, compared to known solutions, enables easier operation, in particular also with regard to the determination of the position of the pavement edge processing device during the ongoing operation of the pavement edge processing device.

[0011] The problem is solved by a method for operating a soil compaction device, by a soil compaction device, and by an asphalt roller according to the independent claims. Preferred embodiments are specified in the dependent claims.

[0012] A soil compaction device of the type described herein, used for compacting a subgrade layer, comprises at least one compaction roller rotatably mounted on a support structure of the device about a horizontal axis of rotation extending transversely to a working direction. The compaction roller has a cylindrical outer surface that rolls on the subgrade during compaction. The compaction roller can, in particular, be a drum roller. Through this rolling motion, the soil compaction device, or the compaction roller, makes contact with the subgrade to be compacted. This contact can be static or dynamic, using vibration exciters known per se.

[0013] The soil compaction device further comprises a surface edge processing device arranged on the supporting structure. The surface edge processing device serves to process the surface edge as it passes through the soil compaction device, for example, by cutting and / or pressing it down. The surface edge processing device comprises, in a manner known per se, an edge processing roller, an adjustable roller holding device, in particular an adjusting arm, and an adjusting drive, wherein the edge processing roller is rotatably mounted on the adjustable roller holding device about a roller rotation axis. The edge processing roller is usually not driven and is freely rotatable on the roller holding device. It can have a central bearing axis and a processing surface circumferentially around the bearing axis, in particular extending at an angle in the radial direction.The adjustable roller holding device is designed such that, together with the edge-processing roller, it is adjustable from an end position to an edge-processing position relative to the outer surface of the compaction roller by means of the adjustment drive and is mounted on the support structure. For this purpose, the adjustable roller holding device can, in particular, be an adjustment arm and / or adjustment lever that is adjustable on one side relative to the support structure and has a bearing for the edge-processing roller spaced apart from this bearing point. In principle, the type of adjustment movement between the end position and the edge-processing position can vary. However, it is preferred that the adjustment arm can be pivoted relative to the support structure about a pivot axis between the end position and an edge-processing position. The pivot axis can, in particular, run parallel to the axis of rotation of the compaction roller.Unlike the end position, which can be a specific or even a single position raised above the ground, the edge processing position can be one of several possible positions within an adjustment range. This adjustment range can, for example, extend from a point where the edge processing roller, with its downward apex (viewed vertically), is at the same height as the lower apex of the roller drum, downwards in the vertical direction to a maximum adjusted position.

[0014] A further defining element of the soil compaction device according to the invention can be a hydraulic system with a hydraulic cylinder that enables, in particular stepless, adjustment of the adjusting arm to which the pavement edge processing device is attached relative to the support structure or, in particular, to the roller drum. The piston rod of the hydraulic cylinder can be attached to the adjusting arm of the pavement edge processing device by means of a bearing. In one example, the bearing can couple the hydraulic cylinder, in particular the piston rod of the hydraulic cylinder, to the adjusting arm. In another example, the bearing can fix the hydraulic cylinder, in particular the piston rod of the hydraulic cylinder, to the adjusting arm, i.e., in particular, hold the piston rod of the hydraulic cylinder in a fixed position relative to the adjusting arm throughout the entire operation of the pavement edge processing device.The hydraulic cylinder can, for example, be a differential cylinder that allows controllable movement of the piston rod in both directions and includes corresponding inlet and outlet lines. The hydraulic system comprising the hydraulic cylinder can include these inlet and outlet lines as well as other elements required for the operation of the hydraulic cylinder, such as a pump, valves, fittings, and the like.

[0015] It is essential that the soil compaction device, according to the embodiments described herein, includes a condition monitoring device for the edge-dressing device. The condition monitoring device can determine the current state of the edge-dressing device (e.g., by estimation) and, if necessary, monitor it. In particular, the condition monitoring device is configured to detect the current state of the edge-dressing roller. Several states of the edge-dressing device can be determined using the condition monitoring device according to the invention. This provides useful information about the current state of the edge-dressing device, which can make operation safer and more reliable and the result more even. Alternatively, the condition monitoring device can also be referred to as a condition determination device or condition monitoring device.

[0016] The condition monitoring device in the soil compaction device according to the invention can, for example, detect at least one operating parameter and / or a change in operating parameters of the hydraulic cylinder or the hydraulic system comprising the hydraulic cylinder by means of a sensor device. Typically, this at least one operating parameter and / or the at least one change in operating parameters is transmitted to a detection device. This can be done via wireless communication or communication via cable. Based on the transmitted operating parameter and / or change in operating parameters of the hydraulic system detected by the sensor device, the detection device can recognize and / or determine a state of the edge-working roller of the soil compaction device.

[0017] In one embodiment, the at least one operating parameter of the hydraulic cylinder or the hydraulic system can relate to a state variable, a change in a state variable, and / or time, in particular the active time or period of the hydraulic cylinder, typically the active time of the hydraulic cylinder since the edge-processing roller reached its end position. The detection device can then detect or determine the current state of the edge-processing roller. The current state of the edge-processing roller can include, in particular, its position (for example, relative to the floor), the edge-processing roller coming to rest on the floor, or a collision with an obstacle. The detection device can include a suitable computer system.

[0018] The condition monitoring device of the soil compaction device according to the invention can thus identify or detect a specific event and / or position of the edge processing roller based on determined operating parameters in the hydraulic system, such as an event of changing the position (and thus in particular a specific adjustment path), the extent of changing the position, reaching a surface (such as the surface to be processed) or an undesired event, such as a collision with an obstacle.

[0019] From a systemic perspective, the soil compaction device according to the invention uses data from the hydraulic system or data related to the hydraulic cylinder to determine the state of another element of the soil compaction device. Specifically, hydraulic parameters generated during the operation of the hydraulic cylinder (hereinafter referred to as operating parameters) are used to identify the state of the edge-processing roller located remotely from it. It can be advantageous to record known operating parameters of the hydraulic cylinder or the hydraulic system encompassing the hydraulic cylinder. Additional sensors are possible, but not necessary. It may be that no additional sensors, such as a distance measurement sensor, are required.In one embodiment of the soil compaction device according to the invention, for example, only operating parameters of the hydraulic cylinder or the hydraulic system comprising the hydraulic cylinder are used to determine the state of the edge-working roller. Hydraulic parameters can, in particular, be pressure and / or pressure change and / or volume flow and / or flow direction and / or flow rate and / or quantities and / or measured values ​​that correlate with one or more of these hydraulic parameters.

[0020] Determining the condition of the edge-working roller from at least one operating parameter of the hydraulic cylinder results in a simplified determination of the adjustment travel, and / or a reliable determination of the processing progress, and / or the avoidance of situations that could potentially damage parts of the soil compaction device. Which of these advantages predominates depends, among other things, on the type of operating parameter recorded and the further use of this one or more recorded operating parameter, as will be shown in particular in the following, more specific embodiments.

[0021] In one example, the sensor device of the condition monitoring device is specifically configured to detect at least the pressure in the hydraulic cylinder or at a defined or suitable location in the hydraulic system (such as a supply line to the hydraulic cylinder), the volumetric flow rate in the hydraulic cylinder, and / or the active operating time of the hydraulic cylinder, typically including the active adjustment time since the end position was last reached. The active time refers to the period during which the hydraulic cylinder's length has been hydraulically adjusted, thus representing the duration of an adjustment movement of the hydraulic cylinder. Detecting the active time of the hydraulic cylinder, particularly as the sole operating parameter, can allow the determination of the total adjustment travel as a state of the edge processing roller.The adjustment range determined based on a time value can be considered a more or less rough estimate, and while comparatively imprecise, it is a simple, effective, and, due to the estimation, still useful method for determining the condition of the edge-working roller. A sensor device comprising (in some cases exclusively) a timer can therefore be used, resulting in particularly cost savings. Since the time is preferably measured from the last time the edge-working roller reaches its end position, the end position of the soil compaction device can be designed accordingly. For example, the end position can be defined by a stop for the edge-working roller itself, its adjustment arm, or another element of the pavement edge-working device. This allows for the convenient measurement of the time since the edge-working roller began moving from this starting position, defined, for example, by a stop.The final position can be recorded. In conjunction with a known distance to the ground, or the ratio of the edge-processing roller to the compaction roller running on the ground, the position of the edge-processing roller relative to the ground can be determined simply, effectively and with little effort.

[0022] In one embodiment of the soil compaction device according to the invention, the pressure at two points on the hydraulic cylinder or the hydraulic system comprising the hydraulic cylinder is measured as at least one operating parameter. For example, a measuring orifice plate can be used for this purpose, or the condition monitoring device can include a measuring orifice plate (hereinafter also simply referred to as an orifice plate) as a sensor device. Typically, one or two pressure sensors can be associated with the measuring orifice plate arranged in the hydraulic system. With two pressure sensors, it is possible, for example, for one pressure sensor to measure the pressure upstream (upstream) and downstream (after) the orifice plate, respectively. The pressure sensor or sensors are connected to the detection device in such a way that they can transmit the measured data to the detection device.This can be achieved, for example, through wireless communication or through cables connecting the detection device and the pressure sensors.

[0023] Preferably, the operating parameter to be recorded is recorded essentially permanently or continuously, that is, over the course of the hydraulic cylinder's activity. In some embodiments of the soil compaction device according to the invention, the term "essentially permanently" can mean that during the operation of the hydraulic cylinder, at least one operating parameter of the hydraulic cylinder is measured several times at defined intervals, the interval between two measurements typically being shorter compared to the active time of the hydraulic cylinder. In particular, the interval between two measurements of at least one operating parameter can be, for example, in the range of 0.1 s to 2 s, typically between 0.1 s and 1 s, and also typically between 0.05 s and 0.2 s.The essentially permanent recording of at least one operating parameter makes it possible to obtain reliable, accurate and timely information about the condition of the edge processing roller and to draw appropriate conclusions from it.

[0024] Even in embodiments of the soil compaction device according to the invention, in which the acquisition of the at least one operating parameter is not essentially continuous during the operation of the hydraulic cylinder, at least two measurements of the at least one operating parameter of the hydraulic cylinder or of the hydraulic system comprising the hydraulic cylinder can preferably be carried out in order to determine or monitor the condition of the edge-processing roller. From the two measurements, for example, the pressure increase over a defined period can be determined. From the pressure increase, in turn, the contact of the edge-processing roller with the material, for example, the ground, can be detected. If the edge-processing roller contacts the ground, the pressure in the hydraulic system can, for example, rise abruptly.The contact of the edge-processing roller with the material can be indicated to the operator of the soil compaction device. The indication of contact (or, more generally, of any event concerning the pavement edge-processing device) can be, for example, by a signal light, a signal tone, a display, or the like. In one embodiment of the soil compaction device according to the invention, the measurement – ​​preferably continuous – of the cylinder pressure of the hydraulic cylinder can provide an indication of the force acting on the pavement edge-processing device, even without significant adjustment movement of the device, particularly the edge-processing roller. This allows further events or conditions concerning the edge-processing roller to be detected, and in particular identified and recognized by the detection device.In one example, the determined force increase during edge cutting can be used to determine the cutting depth. Additionally or alternatively, it can be determined whether excessive forces are acting on the pavement edge processing device due to, for example, unfavorable steering movements or unexpected spatial conditions. This allows for the detection of misuse or an incipient collision and increases the safety of using the soil compaction device according to the invention.

[0025] In one embodiment of the soil compaction device according to the invention, the volume flow rate of the hydraulic cylinder can be determined by measuring the pressure, and further information can be derived from this, such as the force exerted on the edge-working roller, the realized adjustment travel of the edge-working roller, and / or possible obstacles or collisions. Specifically, the speed of the hydraulic cylinder of the soil compaction device according to the invention is essentially determined by an orifice. The hydraulic system comprising the hydraulic cylinder normally operates at a constant working pressure. If the pressure behind the orifice is measured, the volume flow rate per unit of time can be determined relatively accurately, particularly by the detection device, since the volume flow rate across an orifice depends essentially only on the pressure differential.In particular, the volume flow rate through an orifice in the case of a hydraulic cylinder in the soil compaction device according to the invention does not depend essentially on the viscosity of the fluid. From the volume flow rate and the known cross-sectional area of ​​the hydraulic cylinder, the adjustment travel of the hydraulic cylinder can then be determined, for example, and with knowledge of the geometric conditions between the piston rod and the edge-processing roller, the adjustment travel of the edge-processing roller can be determined, for example with the detection device of the state-determination device.

[0026] According to an embodiment of the soil compaction device described herein, the sensor device can have a volume flow sensor or volume current sensor in the hydraulic system, which detects the volume flow as at least one operating parameter of the hydraulic cylinder of the soil compaction device according to the invention.

[0027] In a preferred embodiment of the soil compaction device according to the invention, more than one operating parameter of the hydraulic cylinder can be recorded. For example, the active operating time of the hydraulic cylinder, also called actuation time, and the pressure before and / or after the orifice can be measured (as described above by way of example). This allows the position of the edge-processing roller to be estimated cost-effectively, preferably by starting the measurement from an end position of the actuating cylinder or the end position of the pavement edge-processing device.

[0028] According to one embodiment of the invention, the hydraulic cylinder can be a differential cylinder with a first piston side and a second piston side. In particular, an inlet and outlet of the fluid used in the hydraulic cylinder (typically hydraulic oil) can be provided for each piston side. Preferably, the condition monitoring device of the soil compaction device according to the invention also comprises a pump for pumping the fluid used in the hydraulic cylinder, a first line from the pump to the first piston side of the hydraulic cylinder; a first measuring orifice with an orifice constricting the cross-section of the first line; at least one first pressure sensor downstream of the orifice in the flow direction from the pump to the hydraulic cylinder; optionally, a second pressure sensor upstream of the orifice in the flow direction from the pump to the hydraulic cylinder; and a second line from the second piston side to the pump.Furthermore, the condition monitoring device can include a flow sensor for measuring the volumetric flow rate in the second line. The described arrangement allows the pressure in the hydraulic cylinder's supply line to be measured at one or two points, thus increasing the accuracy of determining the condition of the edge-processing device. The arrangement described here can preferably be used to implement embodiments described above, such as essentially continuous pressure measurement or the determination of the volumetric flow rate by the detection device. The flow sensor for measuring the volumetric flow rate in the second line also helps to increase accuracy and obtain the most precise information possible about the condition (e.g., the position) of the edge-processing device. This sensor can be provided in addition to or instead of one or more pressure sensors.

[0029] In one embodiment of the soil compaction device according to the invention, the condition monitoring device can typically further comprise a second measuring orifice with an aperture that constricts the cross-section of the second line. With the second measuring orifice in the second line of the condition monitoring device, it is particularly possible not only to determine the condition of the edge-working roller on its way from the end position to the working position (in short, towards the ground or downwards), but also its condition on its way from the working position to the end position (or upwards, away from the ground, on the return journey back to the end position). This provides additional information that can be valuable during the operation of the soil compaction device.In one embodiment, by determining the adjustment path back to the end position, the approach to the end position can be omitted, and the sensor device can be measured from virtually any (then known) position. To increase reliability, the end position can nevertheless be approached after a specific time interval, after a specific number of uses of the soil compaction device, or even after each use of the soil compaction device, in order to easily calibrate the condition monitoring device.

[0030] Alternatively or additionally, the soil compaction device according to the invention can include a check valve, in particular a releasable one, in the first and / or second line and / or a third pressure sensor in the first line. These additional or alternative elements of the condition monitoring device serve to increase the accuracy and reliability of the operation of the condition monitoring device of the soil compaction device according to the invention. In particular, the check valve(s) can be provided to suppress unwanted movements of the hydraulic cylinder.

[0031] Accordingly, the sensor device and the detection device in a soil compaction device according to the invention are preferably configured to detect the state of the edge-working roller (such as the adjustment travel of the hydraulic cylinder, contact with the ground, or a collision) essentially exclusively on the basis of one or more operating parameters of the hydraulic cylinder. These one or more operating parameters can be the pressure in the hydraulic cylinder or in the hydraulic system comprising the hydraulic cylinder, the volumetric flow rate through or to / into and / or from / out of the hydraulic cylinder, and / or the active time of the hydraulic cylinder, i.e., the length of the time interval of the respective adjustment of the hydraulic cylinder.In other words, the condition monitoring device of the soil compaction device according to the invention can identify or estimate the condition of the edge-working roller, in particular its position within an adjustment range, especially without (directly) measuring the condition itself, particularly the travel distance. For example, in the present invention, the travel distance of the edge-working roller relative to the ground, and thus the position of the edge-working roller during operation, can be determined without measuring the distance or the travel distance (for example, by means of distance sensors). The same applies to other conditions and / or events to be identified, such as the edge-working roller coming to rest on the ground or a (potential) collision of the edge-working roller.Additional sensors for determining the condition of the edge processing roller, which may be affected by contamination and require calibration, can be omitted in the soil compaction device according to the invention.

[0032] In one embodiment of the soil compaction device according to the invention, the condition detection device can further include a display for showing the detected state of the hydraulic cylinder, in particular the detected stroke of the hydraulic cylinder, and thus the current position of the edge-processing roller. The display can also be designed and controlled such that it indicates a collision and / or a current movement / adjustment, and other information, of the edge-processing roller. The display can, for example, be arranged in the operator's cab of the soil compaction device according to the invention to facilitate operation for the operator, to make the working environment more ergonomic, and to enable the operation of the soil compaction device with greater accuracy (compared to known systems).

[0033] According to some embodiments of the soil compaction device according to the invention, the condition monitoring device can also be used for automated operation, for example, for an automated pavement edge treatment device. For example, the soil compaction device according to the invention can include a control unit (such as a computer or on-board computer) that performs the necessary steps to determine or detect a state of the pavement edge treatment device based on one or more operating parameters of the hydraulic cylinder or the hydraulic system comprising the hydraulic cylinder.In particular, a control unit of the soil compaction device according to the invention can cause the end position to be approached after a certain time interval, after a defined number of uses of the soil compaction device or the pavement edge processing device, before each use of the soil compaction device or the pavement edge processing device and / or for each requested status description of the pavement edge processing device, in particular to be able to have a defined starting point for the measurement(s) of the sensor device, from which - in particular always starting from a defined zero point - the measurements can start and from which the detection device can determine or calculate the status, such as the adjustment path of the pavement edge processing device, in particular the edge processing roller.Furthermore, the detection of the states, the display of the determined states and / or the control of the surface edge processing device can also be carried out automatically based on the determined data on the states.

[0034] The invention also relates to an asphalt roller, in particular an articulated or articulated tandem roller or a rubber-tired roller, with a soil compaction device as described above. The aforementioned features, effects, and advantages of the soil compaction device also apply accordingly to the asphalt roller according to the invention. The same applies to the inventive method described below, which also achieves the solution to the problem stated at the outset, as will be shown below.

[0035] Even if the asphalt roller is a manually operated asphalt roller, the advantages of the invention become particularly evident when the asphalt roller is an autonomously or at least semi-autonomously operating asphalt roller.

[0036] The asphalt roller according to the invention can be designed in particular for carrying out a method according to the invention.

[0037] The invention also relates to a method for operating a soil compaction device, in particular a soil compaction device according to the foregoing embodiments, with a compaction roller, in particular a roller drum, rotatably mounted on a support structure, and a surface edge processing device mounted on the support structure, comprising an edge processing roller, an adjusting arm, and an adjusting drive, wherein the edge processing roller can be adjusted from an end position to an edge processing position by means of the adjusting drive, the adjusting drive comprising a hydraulic system with a hydraulic cylinder. The method according to the invention is particularly suitable for implementation with an asphalt roller according to the invention.

[0038] The method according to the invention comprises at least the following steps: adjusting the edge-processing device from the end position to the edge-processing position; measuring at least one operating parameter of the hydraulic cylinder or the hydraulic system with a sensor device during adjustment; transmitting the at least one operating parameter of the hydraulic cylinder or the hydraulic system to a detection device; and detecting a state of the edge-processing roller, in particular detecting the adjustment path of the edge-processing roller, the contact of the edge-processing roller with the ground, and / or a collision of the edge-processing roller, from the transmitted at least one operating parameter of the hydraulic cylinder or the hydraulic system. According to embodiments of the method described herein, the soil compaction device described above can be used in the method.For example, the above detailed features of the soil compaction device (such as the sensor device, the detection device, the operating parameters, the construction of the condition determination device, etc.) can be applied in the method according to the invention.

[0039] Accordingly, in a preferred embodiment, measuring the at least one operating parameter of the hydraulic cylinder can include measuring the pressure at at least one point in the hydraulic cylinder or at one or more defined points in the hydraulic system (in particular permanently or continuously); measuring the volumetric flow rate through the hydraulic cylinder (also in particular permanently or continuously); and / or measuring the active time of the hydraulic cylinder. In particular, a sensor device as described above can be used for the measurement, and typically the embodiment of the condition monitoring device according to the invention with the associated elements, such as orifice plates, pressure sensors, etc., can be used.

[0040] In one embodiment, the method according to the invention can further include defining an initial position in which the edge-processing roller is in a transport position free of contact with the floor surface, prior to measuring the at least one operating parameter. This definition can be achieved, for example, by moving or pivoting the adjusting arm carrying the edge-processing roller into a defined stop position or similar. Typically, the initial position can correspond to the end position of the floor edge processing device when it is moved into a transport position free of contact with the floor surface. In general, the initial position can be provided, for example, by moving against a stop, by a locking position, by a rest position determined by the geometric conditions, or the like.Furthermore, the method according to the invention can include moving to the defined initial position and starting the measurement from this initial position. This allows for a reliable measurement that leads to results that are always traceable. In other words, the defined initial position allows for a kind of calibration that can ensure the accuracy of the measurement.

[0041] According to preferred embodiments, the method according to the invention can include determining the pressure and / or pressure profile in the hydraulic cylinder as an additional or at least one operating parameter of the hydraulic cylinder. This can be achieved, for example, via the embodiments of the condition monitoring device described above. In one embodiment of the method according to the invention, the method further includes reporting a defined pressure increase, where the pressure exceeds a minimum increase over a defined period. In particular, a defined pressure increase (minimum increase per unit of time) can detect or determine when the edge-processing roller comes to rest on the ground or when the edge-processing roller strikes an obstacle. This prevents damage to the edge-processing roller.Furthermore, the inventive method leads to safe operation of the surface edge processing device, since the condition and position of the edge processing roller are known at all times and significant or unusual events are detected and possibly indicated by a display or an alarm.

[0042] Preferably, in the (especially automated or autonomous) edge-processing device, an upward movement can first be initiated to precisely determine the position of the edge-processing roller. This movement should be extended to ensure that, regardless of the initial position at the start of the process, a defined starting position for the measurement (i.e., for example, the end position or an upper end position of the edge-processing device) has been reached. The downward movement of the edge-processing roller can then be started, and, for example, the volume flow rate can be measured and integrated via the pressure difference. From the volume calculated in this way and the known cylinder area of ​​the hydraulic cylinder, the adjustment travel of the hydraulic cylinder can be determined (especially by the detection device).Typically, the known leverage ratios establish a direct relationship between the estimated cylinder stroke of the hydraulic cylinder and the position of the edge-processing roller. The downward movement of the surface edge-processing device can be continuous or incremental, since the position of the edge-processing roller during the downward movement is known after initialization.

[0043] In general, the downward movement can be controlled manually or automatically. In manual mode, the position of the edge-working roller can be displayed on an operator display in the driver's cab of the soil compaction device. In automatic mode, a target position can be predefined and approached. Displaying the status or events, for example via a display, is also possible. The system or method according to the invention can therefore be used in conventional, semi-autonomous, remotely controlled / teleoperated, and / or autonomous machines.

[0044] In some embodiments, the method according to the invention can further comprise the following steps: Defining a defined target value for one or more states of the edge processing roller, at the latest before the state of the edge processing roller is detected by the detection device, wherein the corresponding state is preferably a force acting on the edge processing roller emanating from the hydraulic cylinder. After the corresponding state of the edge processing roller has been detected by the detection device, the method can also include comparing the detected state with the corresponding defined target value. The comparison can involve comparing the two values ​​and can also include an instruction for action, such as lowering the edge processing roller further or stopping the downward movement of the edge processing roller.This can also be automated, for example by a control unit (such as an on-board computer) that can perform the comparison and issue any subsequent instructions. This allows verification that a desired target value has been achieved. In particular, this can further automate the operation of the soil compaction device.

[0045] To avoid repetition, reference is made to the preceding explanations regarding the procedure and the individual elements that may be used for it.

[0046] The invention will now be explained in more detail with reference to the exemplary embodiments shown in the figures. The figures schematically show: Fig. 1 a side view of an asphalt roller; Fig. 2 an enlarged side view of a pavement edge processing device; Fig. 3 a top view of a pavement edge processing device; Figs. 4-8 schematic views of various condition assessment devices according to embodiments described herein; Fig. 9 a pressure-time diagram for condition assessment according to embodiments described herein; and Fig. 10 a flowchart of the method.

[0047] Identical or similarly functioning components are identified in the figures by the same reference numerals. Repeating components are not individually identified in each figure.

[0048] Figure 1Figure 1 shows an asphalt roller 1, in this case a tandem roller. The asphalt roller 1 has a machine frame 3. A driver's platform 2 can be part of the asphalt roller 1. Its undercarriage comprises support structures 6 and compaction rollers 5, in this case roller drums, mounted on the support structure 6. The compaction rollers 5 are mounted on the machine frame 3 via the support structures 6. Furthermore, the asphalt roller 1 has a drive motor 4, for example a diesel combustion engine or an electric motor, which drives the asphalt roller 1. During operation, the asphalt roller 1 is guided over a surface in or against the direction of travel a and compacts it, for which purpose the compaction rollers 5 are rotated about a travel axis 11. The surface comprises, for example, a subgrade 9 and a sub-surface layer 8 arranged on the subgrade 9.The sub-layer 8, for example, is an asphalt layer that is to be compacted by the asphalt roller 1 to form a road. The sub-base 9 is, for example, soil material arranged beneath the asphalt layer. The asphalt roller 1 according to... Figure 1The invention comprises a soil compaction device 10, comprising a support structure 6, a compaction roller 5, and a surface edge finishing device 7. In the illustrated embodiment, the soil compaction device 10, and in particular the surface edge finishing device 7, is arranged at the front left of the asphalt roller 1. However, the soil compaction device 10 and the surface edge finishing device 7 can equally well be arranged at the front right, rear left, or rear right of the asphalt roller 1. Furthermore, it is also possible for several sides of the machine to each have a soil compaction device 10 with a surface edge finishing device 7.

[0049] The edge processing device 7 is in Figure 2 in an enlarged side view in the same perspective as from Figure 1The surface edge processing device 7 is attached to the support structure 6 of the compaction roller 5. It has an edge processing roller 12, which is mounted on the support structure 6 via a roller holding device 13, here an adjusting arm. In particular, the roller holding device 13, designed as an adjusting arm, is rotatably mounted on the support structure 6 about a pivot axis 30. The edge processing roller 12 is also rotatably attached to the roller holding device 13, specifically about a roller rotation axis 15.

[0050] When the adjusting arm of the roller holding device 13 is pivoted about the pivot axis 30, the position of the edge-processing roller 12 changes in the vertical direction. According to the embodiments described herein, this movement in the vertical direction is referred to as the adjustment path. In particular, the flooring edge-processing device 7, and especially the edge-processing roller 12, is adjusted by pivoting the roller holding device 13 between an end position in which the edge-processing roller 12 has no contact with the floor and an edge-processing position in which the edge-processing roller 12 either cuts off or presses down a portion of the subfloor covering layer 8.To drive this adjustment movement of the roller holding device 13 or the adjusting arm, an adjustment drive 14 is provided, which in the illustrated embodiment is a hydraulic system with a hydraulic cylinder, in particular a double-acting hydraulic cylinder or differential cylinder. The adjustment drive 14 thus adjusts the roller holding device 13 between the end position and the edge processing position.

[0051] The adjustment drive 14 with the hydraulic cylinder is typically connected to a condition monitoring device 31. The condition monitoring device 31 comprises a sensor device for detecting at least one operating parameter of the hydraulic cylinder and a detection device for detecting a state of the edge processing roller, in particular for detecting the adjustment travel of the edge processing roller. The detection device is communicatively coupled to the sensor device in order to be able to detect a state of the edge processing roller based on the data acquired by the sensor device. Various embodiments of the arrangement of the condition monitoring device are described in the Figures 4 to 8 shown in more detail.

[0052] The edge processing device 7 is in Figure 3 shown in a top view, which makes its structure more clearly visible. Thus, it is shown that Figure 3It is evident that the edge-processing roller 12 is rotatably mounted on the roller holding device 13, or the adjusting arm, via a bearing shaft 20. Furthermore, the bearing device 18, or the bearing arm, is also rotatably mounted on the bearing shaft 20. The bearing device 18, or the bearing arm, is therefore also rotatable about the bearing shaft 20, in particular about an adjusting axis 19, which corresponds to the roller rotation axis 15. The condition detection device 31 is connected to the adjusting drive 14, which has a hydraulic cylinder.

[0053] Figure 4Figure 1 shows an example of a condition monitoring device 31 of a soil compaction device 10 according to the invention and the embodiments described herein. The condition monitoring device 31 typically comprises a pump 32 and a first line 45 leading from the pump to the first piston side 41 of the hydraulic cylinder 40, and a second line 46 leading from the pump 32 to the second piston side 42 of the hydraulic cylinder 40. In the [reference to figure] Figure 4 In the example shown, the condition monitoring device 31 further comprises a measuring orifice 33 and a pressure sensor 34, both of which are arranged in the first line 45 and which can, in particular, form a sensor device according to embodiments of the invention. In the Figure 4In the exemplary embodiment shown, only one pressure sensor 34 is arranged downstream of the orifice 33. A substantially constant system pressure can exist in the hydraulic system. The pressure, or in particular the pressure drop across the orifice 33 (i.e., the pressure drop between a system pressure and the pressure of the hydraulic cylinder), can now be determined downstream of (or behind) the orifice 33, so that the volume flow rate per unit time can be determined relatively accurately, for example, by the detection device 60 according to the embodiments described herein. In particular, it can be noted that the volume flow rate across an orifice depends essentially only on the pressure difference. Figure 4 It can thus be seen how the recording of an operating parameter of the hydraulic cylinder 40 (here as the operating parameter the pressure after the orifice 33) leads to the determination of the travel of the piston rod 43, and thus to the adjustment travel of the edge processing roller 12.

[0054] In the second line 46 of the condition detection device 31, a volume flow meter 38 is arranged in addition to or as an alternative to the orifice 33 and / or the pressure sensor 34, which can measure the volume flow to or from the second piston side 42 of the hydraulic cylinder 40. Figure 4 The diagram also shows the connection between the edge processing roller 12 and the hydraulic cylinder 40 via the piston rod 43 and a bearing 44. It also shows the Figure 4 The adjusting arm 18, to which the edge-processing roller 12 is attached, is shown. The bearing 44 can enable movement of the edge-processing roller 12 along an adjustment path, in particular at least partially vertical movement, when the piston rod 43 connected to it is moved.

[0055] The detection device 60 of the soil compaction device 10 according to the invention is in Figure 4The pressure sensor 34 in the first line 45 and the flow sensor 38 in the second line 38 are shown connected by dashed lines. The pressure sensor 34 and the flow sensor 38 are shown as exemplary components of a sensor device of the state detection device 31. Additionally or alternatively, the timer 55 can also be part of the sensor device and enable the determination of the extent of an adjustment movement of the edge processing roller 12 solely over the adjustment period, for example, of the hydraulic cylinder 40. In some embodiments, the detection device 60 can be connected to all sensors of the state detection device 31.

[0056] Further supplementary or alternative elements of the condition detection device 31 according to the embodiments described herein are, for example, a pressure control valve 36, which can be adjustable, and flow elements 37 that regulate the flow in the corresponding directions. This can also be determined supplementarily or alternatively using the timer 55 and used to determine the adjustment path.

[0057] Figure 5 Figure 1 shows a further embodiment of the condition detection device 31 of the soil compaction device 10 according to the invention. In the Figure 5In the illustrated embodiment, a second pressure sensor 35 is arranged upstream of (or even upstream of) the orifice. The second pressure sensor 35 allows the expected pressure during normal operation of the hydraulic system to be verified and, if necessary, corrected. This enables even small deviations in the pressure level to be detected, and the precision of determining the state of the edge processing roller 12 can be increased.

[0058] In Figure 6 A further embodiment of the condition assessment device 31 of a soil compaction device 10 according to the invention is shown. This includes, in addition to the features already mentioned in relation to the Figures 4 and 5 The elements described include a check valve 50 in the first line and in the second line, as well as a third pressure sensor 51 upstream of the check valve 50 in the first line 45. This can also be provided as an alternative to the pressure sensor 35. Furthermore, the Figure 6A suspension 52 of the hydraulic cylinder 40 on a rigid system is shown, which can be provided, for example, by a support structure of the soil compaction device according to the invention. The check valves 50 prevent backflow of the hydraulic fluid (typically oil) and thus ensure correct positioning of the edge-working roller 12.

[0059] The Figure 7 Figure 1 shows a further embodiment of the condition detection device 31 of the soil compaction device 10 described herein according to the invention. In the Figure 7The condition monitoring device 31 shown also has a measuring orifice 53 in the second line 46, which is connected to the second piston side 42 of the hydraulic cylinder 40. Additionally, another pressure sensor 54 is installed in the second line 46 to measure the pressure downstream of the orifice 53. In this way, the condition of the edge-processing roller 12 can be determined even more precisely. For example, the pressure in the second piston side can be determined exactly, and the adjustment travel of the edge-processing roller 12 can thereby be determined by means of the detection device. In particular, the essentially vertical, but upward-moving adjustment travel of the edge-processing roller 12 can also be determined. Alternatively or additionally, the pressure sensor 54 can also be used in addition to, or instead of, the pressure sensor 34.

[0060] Although not shown in all figures, the person skilled in the art can understand that the detection device 60 (shown, for example, in Figure 4 The sensor device of the soil compaction device according to the invention, which is connected to the sensor device, is also present in the other embodiments. In particular, the detection device can be connected to some or all of the sensors belonging to the sensor device, such as pressure sensors, flow sensors, timers, and the like.

[0061] Figure 8 Figure 1 shows another example of a condition monitoring device 31 of a soil compaction device 10 according to the invention. The condition monitoring device 31 of the Figure 8 The sensor device includes, as its (in particular, sole) element, a timer 55 which measures the active time of the hydraulic cylinder 40 of the soil compaction device 10 according to the invention. Figure 8The timer 55 measures, for example, the time of movement of the piston rod 43 and can transmit this data to the detection device 60 via a connection (shown with a dashed line). Additionally or supplementarily, the time of operation of the pump 32 can also be measured by a timer, or the time of operation of other elements representative of the hydraulic cylinder's activity can be measured. From the measured time, the detection device 60 can estimate the distance traveled (the adjustment path) of the hydraulic cylinder. In particular, based on the known geometric conditions, the distance traveled by the edge-processing roller 12 can also be estimated.

[0062] Other embodiments of the present invention not shown in the figures may, for example, include combinations of the systems shown, such as combinations of the various sensors shown (such as pressure sensors, timers and / or flow sensors).

[0063] Typically, the hydraulic system of the edge-processing device can be connected to the existing hydraulic system of the soil compaction device. Additionally or alternatively, a decentralized system, in particular an electro-hydraulic system, comprising, and especially exclusively, an electrically driven hydraulic pump and the hydraulic cylinder, which are in fluid-conducting communication with each other, particularly directly, can also be provided.

[0064] While the figures described above mainly illustrate how to recognize the adjustment path as the state of the edge processing device, they also show Figure 9schematically, how the detection of a different state, for example, contact with the material (or the asphalt layer), can take place. Figure 9 The diagram shows the pressure p over time t. The pressure can be determined, for example, by the [equation / tool / etc.] in the [reference / document / etc.]. Figures 4 to 8 The sensor devices shown and described are carried out. In the Figure 9In the example shown, the pressure initially remains essentially constant at the value p1. At time t1, there is a very rapid increase to the value p2. This increase is relatively steep and ends at time t2. The values ​​for p1, p2, t1, and t2 depend on the characteristics of the soil compaction device, as well as the soil and the edge-working roller. The detection device, which receives these values ​​from the sensor device, will, for example, deduce from the diagram shown that the edge-working roller has made contact with the ground and recognize this state. In the example shown, Figure 9 It could be, for example, the beginning of a cutting or pressing process.

[0065] In some embodiments, the detection device can then report this condition, for example to a display, or initiate an alarm, such as a visual or audible alarm, to inform the driver of the soil compaction device of the event of grounding.

[0066] According to some embodiments described herein, the pressure can continue to increase, either at the same rate or at a flatter rate, for example, if a collision occurs or the material to be cut changes. The detection device of the present invention can also detect this, either by comparing it with stored data or by evaluating a schematic.

[0067] Additionally or supplementarily, the detection device can also store data on expected states, such as a time period or adjustment range after which the edge processing roller is expected to make contact. If a sharp pressure increase occurs outside of these expected events, the detection device can, for example, report a collision, thereby preventing further damage and / or moving the edge processing roller to a safe position, particularly the raised end stop.

[0068] Figure 10Figure 65 shows a flowchart of the method according to the invention. The method 65 comprises adjusting 61 the edge-processing device 7 from the end position to the edge-processing position, and during the adjustment measuring 62 at least one operating parameter of the hydraulic cylinder 40 with a sensor device. The at least one operating parameter of the hydraulic cylinder 40 can be, for example, the active time of the hydraulic cylinder (in particular since the end position was last reached), the pressure in the hydraulic cylinder or in one of the supply lines, or the volumetric flow rate of the hydraulic fluid in one of the supply lines.The method according to the invention further comprises transmitting 63 of at least one operating parameter of the hydraulic cylinder 40 to a detection device 60; and detecting 64 a state of the edge-processing roller 12, in particular detecting the adjustment travel of the edge-processing roller 12, the contact of the edge-processing roller 12 with the ground and / or a collision of the edge-processing roller 12, from the transmitted at least one operating parameter of the hydraulic cylinder. It is essential for the invention, on the one hand, that operating parameters of the hydraulic cylinder or of the hydraulic system containing the hydraulic cylinder are used to determine the state of the edge-processing roller; thus, an element of the soil compaction device is measured whose parameters are not per se relevant for detecting the state of the edge-processing roller.However, the detection device uses these parameters of a first element (here, the hydraulic system) to determine the status of a second element (here, the edge-processing roller). This offers several advantages, particularly compared to directly measuring the distance of the edge-processing roller. For example, the sensors in the hydraulic system (i.e., in the lines to the hydraulic cylinder) are less exposed to contamination compared to sensors that directly measure the distance of the edge-processing roller. Furthermore, moving to an end position can be considered a type of calibration, whereas distance sensors that directly measure the distance of the edge-processing roller, for example, require regular calibration, which typically necessitates a pause in the edge-processing machine.

[0069] It should be noted that all features described herein with reference to the soil compaction device, or its elements, can also be applied in the inventive method according to the embodiments described herein.

Claims

1. Method (27) for operating a soil compaction device (10) with a compaction roller (5) rotatably mounted on a support structure (6) and a pavement edge-processing device (7) mounted on the support structure (6), comprising an edge-processing roller (12), an adjusting arm (18) and an adjusting drive (14), wherein the edge-processing roller (12) is adjustable from an end position to an edge-processing position by means of the adjusting drive (14), wherein the adjusting drive comprises a hydraulic system with a hydraulic cylinder (40), the method (27) comprising at least the steps: a) adjusting (28) the pavement edge-processing device (7) from the end position to the edge-processing position, b) measuring at least one operating parameter of the hydraulic system with the hydraulic cylinder (40) by means of a sensor device during adjustment,c) Transmitting at least one operating parameter of the hydraulic system to a detection device (60); and d) Detecting a state of the edge processing roller (12), in particular detecting the adjustment travel of the edge processing roller (12) and / or the contact of the edge processing roller (12) with the ground and / or a collision of the edge processing roller (12), from the transmitted at least one operating parameter of the hydraulic system.

2. Method for operating a soil compaction device (10) according to claim 1, characterized by that Measuring at least one operating parameter of the hydraulic cylinder (40) includes measuring at least one of the following: - pressure at at least one point in the hydraulic cylinder (40) or in a supply line (45; 46) of the hydraulic cylinder (40); - volume flow through, into or out of the hydraulic cylinder (40); and - active time of the hydraulic cylinder (40).

3. Method for operating a soil compaction device (10) according to one of the preceding claims, characterized by that it further includes: - Defining an initial position in which the edge processing roller (12) is in contact with the ground surface before measuring at least one operating parameter of the hydraulic cylinder (40), - Moving to the defined initial position; and - Starting the measurement from the initial position.

4. Method for operating a soil compaction device (10) according to one of the preceding claims, characterized by that the measurement of at least one operating parameter of the hydraulic cylinder (40) is carried out essentially continuously.

5. Method for operating a soil compaction device (10) according to one of the preceding claims, characterized by thate) includes displaying the result of the detection device (60), in particular displaying the adjustment travel of the hydraulic cylinder (40) on a display.

6. Method for operating a soil compaction device (10) according to one of the preceding claims, characterized by that The measurement of at least one operating parameter and the detection of the condition of the edge processing roller (12), in particular the adjustment travel of the hydraulic cylinder (40), is carried out essentially exclusively on the basis of the following parameters: - pressure in the hydraulic cylinder (40) or at a defined point in the hydraulic system; - volume flow through the hydraulic cylinder (40); and - active time of the hydraulic cylinder (40).

7. Method for operating a soil compaction device (10) according to one of the preceding claims, characterized by thatthe pressure in the hydraulic cylinder (40) is additionally or as at least one operating parameter of the hydraulic cylinder (40) is determined, the method further comprising: reporting a defined pressure increase where the pressure exceeds a minimum increase over a defined period in order to detect the contact of the edge processing roller (12) with the ground or the contact of the edge processing roller (12) with an obstacle.

8. Method for operating a soil compaction device (10) according to one of the preceding claims, characterized by thatIt includes: - Defining a defined target value for a corresponding state of the edge processing roller (12) at the latest before the state of the edge processing roller (12) is detected, in particular a force acting on the edge processing roller (12); - after the corresponding state of the edge processing roller (12) has been detected, comparing the determined state with the corresponding defined target value.

9. Soil compaction device (10) for compacting a subgrade layer (8), - comprising at least one compaction roller (5) rotatably mounted on a support structure (6) of the soil compaction device (10) about a horizontal and transverse axis of rotation (11) to a working direction (a), the compaction roller comprising a cylindrical outer surface which rolls on the subgrade during compaction operation, - comprising a surface edge processing device (7) arranged on the support structure (6), comprising an edge processing roller (12), an adjustable roller holding device (13), in particular an adjusting arm, and an adjusting drive (14), wherein the adjustable roller holding device (13) together with the edge processing roller (12) is adjustably mounted on the support structure (6) by means of the adjusting drive (14) from an end position to an edge processing position,- wherein the adjusting drive (14) has a hydraulic system with a hydraulic cylinder (40), , characterized by that The soil compaction device comprises a condition detection device (31) for the pavement edge processing device (7), wherein the condition detection device (31) includes: - a sensor device for detecting at least one operating parameter of the hydraulic system with the hydraulic cylinder (40); and - a detection device (60) which, based on the at least one operating parameter of the hydraulic system with the hydraulic cylinder (40), is configured to detect a condition of the edge processing roller (12), in particular to detect the adjustment travel of the edge processing roller (12), the contact of the edge processing roller (12) with the ground and / or a collision of the edge processing roller (12).

10. Soil compaction device (10) according to claim 9, characterized by thatThe sensor device is set up to detect at least one operating parameter of the hydraulic cylinder (40) from the following list: - pressure in the hydraulic cylinder (40) or at a defined point in the hydraulic system; - volume flow through the hydraulic cylinder (40); and - active time of the hydraulic cylinder (40).

11. Soil compaction device (10) according to one of claims 9 to 10, characterized by that the sensor device is set up to detect at least one state variable of the hydraulic system with the hydraulic cylinder (40) essentially continuously.

12. Soil compaction device (10) according to one of claims 10 to 11, characterized by that the sensor device has at least one of the following features: - a measuring orifice (33), - a flow sensor (38), - at least one pressure sensor (34; 35), - an ultrasonic flow sensor, and / or - a timer (55).

13. Soil compaction device (10) according to one of claims 9 to 12, characterized by that The detection device is designed to use data from the sensor device to determine the volume flow rate of the hydraulic cylinder (40), and to determine the adjustment travel of the hydraulic cylinder (40) from the volume flow rate and the cross-sectional area of ​​the hydraulic cylinder (40).

14. Soil compaction device (10) according to one of claims 9 to 13, characterized by that the condition detection device (31) further comprises a display for showing the detected condition of the hydraulic cylinder (40), in particular the detected stroke of the hydraulic cylinder (40).

15. Soil compaction device (10) according to one of claims 9 to 14, characterized by thatthe sensor device and the detection device (60) are set up to detect the state of the edge processing roller (12), in particular the adjustment travel of the hydraulic cylinder (40), especially exclusively, on the basis of the following parameters: - pressure in the hydraulic cylinder (40) or at a defined point in the hydraulic system; - volume flow through the hydraulic cylinder (40); and - active time of the hydraulic cylinder (40).

16. Soil compaction device (10) according to one of claims 9 to 15, characterized by thatthe hydraulic cylinder (40) is a differential cylinder with a first piston side (41) and a second piston side (42), and wherein the condition detection device (31) further comprises: - a pump (32); - a first line (45) from the pump to the first piston side (41) of the hydraulic cylinder (40); - a measuring orifice (33) with an orifice (33) constricting the cross-section of the first line (45); - at least one first pressure sensor (34) downstream of the orifice (33) in the direction of flow from the pump (32) to the hydraulic cylinder (40); - optionally at least one second pressure sensor (35) upstream of the orifice (33) in the direction of flow from the pump (32) to the hydraulic cylinder (40); - a second line (46) from the second piston side (42) to the pump (32); and - in particular, a flow sensor (38) for measuring the volumetric flow rate in the second line (46).

17. Soil compaction device (10) according to claim 16, characterized by thatthe condition monitoring device (31) further comprises at least one of the following features: - A second measuring orifice (33) with an orifice constricting the cross-section of the second line (46); - at least one check valve (50) in the first and / or second line.

18. Asphalt roller (1), in particular articulated or articulated tandem roller, with a soil compaction device (10) according to one of claims 9 to 17.

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