LEVELLING DIAGNOSTIC SYSTEM

Abstract

Method for evaluating of a quality of a generated pavement or a generated surface, generated by use of a construction machine, especially a road construction machine, road finishing machine or milling machine, having the following steps: receiving sensor values from one or more sensors and/or a sensor system of the construction machine; determining a specific sensor value combination within the sensor values, the specific sensor value combination being assigned to a specific quality situation; and outputting an operator message dependent on the specific quality situation.

Claims

1. A method for evaluating of a quality of a generated pavement, generated by use of a road finishing machine, comprising: receiving sensor values from one or more sensors of a leveling system of the road finishing machine and/or a layer thickness measurement system of the road finishing machine and one or more actuator control values for controlling the road finishing machine, especially the paving procedure or a screed of the road finishing machine; determining a specific sensor value combination within the sensor values taking into account the one or more actuator control values, the specific sensor value combination being assigned to a specific quality situation; and outputting an operator message dependent on the specific quality situation.

2. The method according to claim 1, wherein the specific value combination is out of a plurality of specific value combinations; and/or wherein a specific sensor value combination is out of a plurality of specific sensor value combinations stored by a database; wherein a specific sensor value combination is a pattern comprising sensor values and one or more actuator control values, wherein the sensor values are used by the leveling system or by the layer thickness measurement system for controlling the paving procedure or the screed of the road finishing machine via the one or more actuator control values.

3. The method according to claim 2, wherein the plurality of specific sensor value combinations comprises another specific sensor value combination being assigned to another specific quality situation, such that another operator message can be output dependent on the another specific quality situation.

4. The method according to claim 1, wherein the operator message comprises an information regarding the specific quality situation and/or a suggestion for improving the specific quality situation and/or an information on a parameter to be adapted or an actuator control value to be adapted.

5. The method according to claim 1, wherein the sensor values are received over time and wherein the sensor value combination is determined taking into account a value deviation of sensor values received over the time of at least one sensor value of the sensor values.

6. The method according to claim 1, further comprising receiving one or more process control parameters, wherein determining is performed taking into account the one or more process control parameters; or further comprising receiving one or more process control parameters, wherein determining is performed taking into account the one or more process control parameters and wherein the one or more process control parameters are received as an input of the operator.

7. The method according to claim 1, wherein one sensor value of the sensor values is determined using a distance sensor, a cross slope sensor and/or a 3D process control system.

8. The method according to claim 5, wherein an actuator control value of the one or more actuator control values describes a height position of a tool or a screed, and/or a width information of the tool or the screed, and/or a speed information of the construction machine; and/or wherein a process control parameter comprises a temperature information and/or a material temperature information of a paving or installed road surface.

9. The method according to claim 1, wherein a sensor value of the sensor values or an actuator control value and/or a process control parameter are extracted from a CAN bus.

10. A non-transitory digital storage medium having stored thereon a computer program for performing a method for evaluating of a quality of a generated pavement, generated by use of a road finishing machine, comprising: receiving sensor values from one or more sensors of a leveling system of the road finishing machine and/or a layer thickness measurement system of the road finishing machine and one or more actuator control values for controlling the road finishing machine, especially the paving procedure or a screed of the road finishing machine; determining a specific sensor value combination within the sensor values taking into account the one or more actuator control values, the specific sensor value combination being assigned to a specific quality situation; and outputting an operator message dependent on the specific quality situation, when said computer program is run by a computer.

11. A paving machine comprising a leveling system and/or a layer thickness measurement system and a diagnosis control unit and a process control unit, the diagnosis control unit for evaluating of a quality of a generated pavement, generated by use of a paving machine, comprising: an interface for receiving sensor values from one or more sensors of the leveling system of the paving machine and/or the layer thickness measurement system of the paving machine and one or more actuator control values for controlling the road finishing machine, especially the paving procedure or a screed of the road finishing machine; a processor configured to determine a specific sensor value combination within the sensor values taking into account the one or more actuator control values, the specific sensor value combination being associated with a specific quality situation; and an interface for outputting an operator message dependent on the specific quality situation.

12. The paving machine according to claim 11, wherein the interface for receiving sensor values comprises a CAN bus interface; and/or wherein the interface for outputting an operation message comprises a human machine interface and/or a wireless communication link to a mobile device.

13. The paving machine according to claim 11, wherein the diagnosis control unit further comprises a database or an interface for generating access to a database, the database storing a plurality of specific sensor value combinations.

14. The paving machine according to claim 11, wherein the specific value combination is out of a plurality of specific value combinations; and/or wherein a specific sensor value combination is out of a plurality of specific sensor value combinations stored by a database; wherein a specific sensor value combination is a pattern comprising sensor values and one or more actuator control values, wherein the sensor values are used by the leveling system or by the layer thickness measurement system for controlling the paving procedure or the screed of the road finishing machine via the one or more actuator control values.

15. The paving machine according to claim 14, wherein the plurality of specific sensor value combinations comprises another specific sensor value combination being assigned to another specific quality situation, such that another operator message can be output dependent on the another specific quality situation.

16. The paving machine according to claim 11, wherein the operator message comprises an information regarding the specific quality situation and/or a suggestion for improving the specific quality situation and/or an information on a parameter to be adapted or an actuator control value to be adapted.

17. The paving machine according to claim 11, wherein the sensor values are received over time and wherein the sensor value combination is determined taking into account a value deviation of sensor values received over the time of at least one sensor value of the sensor values.

18. The paving machine according to claim 11, wherein one or more process control parameters are received, wherein the one or more process control parameters are taken into account for the determination; or wherein the one or more process control parameters are received, wherein the one or more process control parameters are taken into account for the determination and wherein the one or more process control parameters are received as an input of the operator.

19. The paving machine according to claim 11, wherein an actuator control value of the one or more actuator control values describes a height position of a tool or a screed, and/or a width information of the tool or the screed, and/or a speed information of the construction machine; and/or wherein a process control parameter comprises a temperature information and/or a material temperature information of a paving or installed road surface.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Embodiments of the present invention will subsequently be discussed below referring to the enclosed figures, in which:

[0034] FIG. 1a shows a schematic flow diagram of a basic method according to embodiments;

[0035] FIG. 1b shows a schematic block diagram of a diagnosis control unit according to a basic embodiment;

[0036] FIG. 1c shows a schematic block diagram of a diagnosis control unit according to enhanced embodiments;

[0037] FIG. 1d shows a schematic block diagram of a diagnosis control unit according to another enhanced embodiment;

[0038] FIG. 2 shows a schematic block diagram of a construction machine/paving machine according to embodiments;

[0039] FIG. 3 shows another block diagram of a paving machine according to further embodiments;

[0040] FIG. 4 schematically illustrates a levelling system, e.g., belonging to a paving machine according to embodiments;

[0041] FIG. 5 shows a schematic block diagram of a paving machine according to enhanced embodiments including optional features; and

[0042] FIG. 6 shows a schematic block diagram of a construction machine/milling machine according to embodiments.

DETAILED DESCRIPTION OF THE INVENTION

[0043] Below, embodiments of the present invention will subsequently be discussed referring to the enclosed figures, wherein identical reference numerals are provided to objects having similar or identical functions, so that the description thereof is mutually applicable and interchangeable.

[0044] FIG. 1 shows a method 100 comprising three basic steps 110, 120, and 130, which will be discussed taking reference to FIG. 1b.

[0045] FIG. 1b shows a construction machine 10, here a paving machine/road finishing machine comprising a measurement system. The measurement system may be a levelling system, which comprises at least the one sensor 41. The sensor system or the one sensor 41 receives measurement values M1, M2, M3, etc. These measurement values can be, for example, measured values for subsequent points of time, or measurement values of different sensors or measurement points. The measurement values M1, M2, M3, . . . can be received by the diagnosis control unit, e.g., a levelling diagnostic system, which is marked by the reference numeral 300. Within FIG. 1a, this step is marked by the reference numeral 110 “receiving sensor values” from one or more sensors 41 and/or sensor system 41 of the construction machine 10.

[0046] The diagnosis control unit 300 processes these sensor signals M1, M2, and M3 so as to determine a pattern within the sensor signals. In the table illustrated by FIG. 1b, the patterns P1 and P2, also referred to as sensor value combinations within the sensor values M1, M2, M3, . . . are illustrated. The step of determining a pattern or determining a specific sensor value combination is marked by the reference numeral 120 in FIG. 1a. As can be seen, the two patterns P1 and P2 use the same sensor values M1, M2, M3, wherein each pattern P1 and P2 is defined by a different combination of the values. For example, the value combination for pattern P1 is 2-4-3 for the three sensors M1, M2, M3, while the value combination for pattern P2 is 3-3-3. This enables the diagnosis control unit 300 to determine the pattern P1, if the sensor system 41 delivers the sensor signals 2-4-3 and the pattern P2, if the sensor system 41 delivers the sensor signals 3-3-3.

[0047] For example, each pattern may be assigned to a specific quality situation of the generated surface/generated pattern 22. The quality of a pavement 22 assigned to pattern 2 may be high, e.g., an even surface, while the quality of the pavement 22 assigned to pattern P1 may be lower, e.g., an uneven surface. Thus, a sensor value combination 3-3-3 indicates a high quality, while sensor value combination 2-4-3 indicates a low quality. At this point it should be noted that these are only examples of sensor value combinations and patterns. Other combinations and patterns are also conceivable.

[0048] In case pattern P1 is determined by the diagnosis control unit 300, an operator message may be output, e.g., using a human machine interface like a display. This operator message may include an information on the generated quality or even instructions for how to improve the quality, such that the operator can adapt the process. In FIG. 1a, this step is illustrated by the reference numeral 130. In view of this method step 130, it becomes clear that the operator message is (generally speaking) dependent on the specific quality situation determined by use of the patterns 120.

[0049] To sum up, the idea is to identify specific situations or problems that can be detected in real time in observed patterns P1 and P2 in the levelling system control loop or another measurement system. This enables to communicate recommended corrective actions to the operators, or screed operators, and/or to the road construction company.

[0050] The levelling diagnostic system 300 can proactively identify problems and then notify the screed operators on what should be corrected. This helps to make the leveling system smarter with some logic or intelligence for self-diagnostics. According to embodiments, the above-discussed diagnosis control unit may be integrated into a process control unit and/or connected to a process control unit or integrated into the levelling system or connected to the levelling system. By collecting data and screening them, a pattern should be found on the output to get information on how to solve a problem that had been identified. Furthermore, if the screed operators can be removed from the paver for semi-autonomous operation, this functionality would be very helpful. The diagnosis control unit/levelling diagnostic system forms the basis for such a semi-autonomous operation where the levelling diagnostic system then acts as a virtual expert instead of the existing experts in the field.

[0051] According to one example, incorrect parameter settings can be illustrated. If the sensitivity settings, working window, or valve settings are too high or too low, it is obvious to a trained person watching that there is a problem with the settings. Therefore, according to further embodiments, the diagnosis control unit 300 may be access to actuator control values, e.g., the actuator control value defining the high position of the screed or to process parameters, e.g., having a temperature or a velocity of the paving machine. An actuator control value is a value belonging to the levelling system itself, while an operation parameter is an external parameter, e.g., of the construction machine 10 or a parameter defined by the circumstances. For example, a process parameter can also be a measured parameters like the temperature value. Further, the known problems are: sensor out of range, hydraulic problems, wrong valve settings, incorrect levelling system control loop parameter settings or the use of a wrong sensor. In such a case, the sensor value may generally interpreted as an information received from the measurement system.

[0052] It is foreseen as a levelling diagnostic system that only has a window into the levelling system controller or levelling control somehow. Thus, the levelling system controller or the levelling kernel may comprise the diagnostic control unit 300 or may comprise a processor for performing the method 100. Possibly, it is a software product (app) that interfaces with the levelling system to monitor and self-diagnose levelling system problems. In such a case, the processor may be implemented into the smart device, like a tablet PC having access to at least sensor values or even to actuator control values and/or process parameters, wherein the method 100 is performed by the processor of the smart device. Part of this could be simply remoted diagnostics.

[0053] According to embodiments, the different patterns P1 and P2 are stored by a database. For example, the database may be an internal database of the diagnostic control unit 300 or an external database, e.g., a cloud based database.

[0054] According to embodiments the pattern may mainly consist out of sensor data received from a levelling system and actuator (control) signals controlling the paving machine especially the screed of the paving machine or, in general the paving procedure. The actuator data may be control information, e.g. controlling the thickness or evenness of the produced pavement for example, the actuator data may comprise an information on increasing the height of the screed or reducing the height of the screed. Thus, the actuator data must not necessarily comprise information about an absolute position, but also on a relative position of the actuator elements. By using the pattern of the sensor data which is used by the leveling system and the actuator data via which the leveling system controls the patterning procedure the diagnostic control unit 300 can determine specific situations, like building up short term or long term ripples.

[0055] By using such patterns it is official that the clear relationship between the sensor data and the actuator data which are controlled by a levelling system are taken into account as a whole.

[0056] Below, the diagnostic control unit 300 may be discussed in the context of a road finishing machine/paver 10.

[0057] FIG. 1c and 1d show a levelling system (measurement system/sensor system) 40 for a road finishing machine (paver) 10 or a road milling machine. The levelling system 40 comprises a levelling system control unit 45, consisting essentially of a process control unit 45A and an operating and monitoring unit (control and display device) 45B. The process control unit 45A reads in and processes measured sensor values and controls, using the example of a road finishing machine (paver) 10, the height position of a paver screed 15 (not shown in FIGS. 1c and 1d) as a function of the measured sensor values, that means the process control unit 45A functions as a levelling unit. Via the operating and monitoring unit 45B, an operator, for example the paver screed personnel, can set adjustments or changes to various parameters concerning the levelling or monitor them during the working process. The operating and monitoring unit 45B serves as a so-called human-machine interface (HMI or MMI). In an advantageous variant, the process control unit 45A and the operating and monitoring device 45B are combined in one device or in one housing, that means components are integrated within one device or housing.

[0058] Furthermore, the levelling system 40 comprises at least one sensor 41 connected to the process control unit 45A, whereby it is also conceivable that the levelling system 40 comprises more than one sensor, all of which are connected to the process control unit 45A. As shown in FIGS. 1c and 1d, the levelling system 40 comprises as an example two distance sensors 41 and 44, and an additional sensor 200, which can be for instance a slope sensor, a 3D sensor system, or the like. The illustration is only an example and the levelling system 40 can also include further known sensors or known sensor systems (not shown and mentioned here).

[0059] All sensors of the levelling system 40 may be advantageously connected via cable connections to the process control unit 45A, for instance via a CAN fieldbus system (CAN INPUT) or other kind of known network or known fieldbus system used in mobile construction machines. The sensors can also be separately (and directly) connected to the process control unit 45A, that means via an individual or single cable connection for each sensor or connected to the process control unit 45A via a kind of hub, distribution (junction) box or the like. Note, the above-discussed entities are partially optional. For example, the process control unit 45a can be without the operating and monitoring unit 45b. Furthermore, different sensors or sensor systems may be used.

[0060] According to further embodiments, the levelling system 40 consists of at least one actuator 51 connected to the process control unit 45A, whereby it is also conceivable that the levelling system 40 comprises more than one actuator, all of which are connected to the process control unit 45A. As shown in FIGS. 1c and 1d, the levelling system 40 comprises as an example two actuators 51 and 52, which can be for instance one or more hydraulic valves or hydraulic valve control system(s) or the like. Actuators 51 and/or 52 are for instance used to extend and retract tow arm cylinders of a road finishing machine (paver) 10, or to extend and retract front and rear landing gear cylinders 16F/R of a road milling machine 10.

[0061] All actuators of the levelling system 40 are advantageously connected via cable connections to the process control unit 45A, for instance via a CAN fieldbus system (CAN OUTPUT) or other kind of known network or known fieldbus system used in mobile construction machines. The actuators can also be separately (and directly) connected to the process control unit 45A, that means via an individual or single cable connection for each actuator or connected to the process control unit 45A via a kind of hub, distribution (junction) box or the like.

[0062] According to further embodiments, the process control unit 45A can be connected to a machine control system of the road finishing machine (paver) 10 or the road milling machine 10, for instance via the CAN fieldbus systems (CAN INPUT and/or CAN OUTPUT) or another individual CAN fieldbus system, in order to get further data of the machine 10 or of the working process (machine speed, machine status, . . . ) or in order to provide data to the machine 10 or to the working process (sensor data, levelling parameters, . . . ). It is also conceivable, that the connection between the machine control system of the road finishing machine (paver) 10 or the road milling machine 10 is another individual or single cable connection or a wireless connection.

[0063] According to embodiments, a levelling diagnostic system 300 is connected to the levelling system 40 via connections 301, 302 and/or 303, as shown in FIG. 1c. The levelling diagnostic system 300 accesses sensor and actuator (control) data (via connections 301 and 302) as well as data from the process control unit 45A (via connection 303). As already explained above for connections between sensors and actuators and the process control unit 45A, the individual connections 301, 302 and 303 themselves are either CAN fieldbus or other kind of known network or known fieldbus system connections or individual direct or single cable connections. The levelling diagnostic system 300 itself can be a non-depicted and not further defined levelling diagnostic unit (diagnosis control unit) with an appropriate diagnostic software, which can read in, process and output data. For example, the levelling diagnostic system 300 can read in sensor and actuator (control) data via connections 301 and 302 and/or data from the process control unit 45A of the levelling system 40 via connection 303 to analyze parameter settings or the like and outputs information to the operator (via connection 303 to the operating and monitoring unit 45B) what is wrong and which adjustments have to be done. Furthermore, the diagnosis control unit may comprise an interface outputting an operation message, wherein this interface may be realized as human machine interface (HMI), like touch display. The diagnosis control unit can (additionally or as an alternative) comprise an interface outputting an operating message, this interface may be realized as a wireless communication link to a mobile device 80, like a smartphone, Tablet-PC or the like. The wireless communication link can be, for example, a Bluetooth or WLAN connection or the like. It is also conceivable, that the levelling diagnostic system 300 is a software product running also on the process control unit 45A. This means that in addition to the levelling software, there is also a diagnosis software on the process control unit 45A that monitors data of the inputs and outputs (sensor and actuator (control) data) as well as the levelling data and outputs information to the machine operator. The operating message can then be shown, for example, as a text message and/or in the form of (animated) symbols or the like.

[0064] In another embodiment of the invention, as shown in FIG. 1d, the levelling diagnostic system 300 is a software product (App), running on a remote data server system 90 or on a mobile device 80, which can be, for example, a laptop computer or a tablet PC or a smartphone or the like. The mobile device 80 has a communication unit 85 to communicate via corresponding wireless connection types such as WLAN, Bluetooth, etc. The levelling diagnostic system 300 is connected to the levelling system 40 via a wireless connection. Therefore, the process control unit 45A of the levelling system 40 is connected via a cable connection 70k to a wireless communication interface unit 70. Via the wireless communication interface unit 70, the levelling system 40 (the process control unit 45A) can wirelessly exchange data with the levelling diagnostic system 300 on the remote data server system 90 and/or on the mobile device 80, that is to say to wirelessly transmitting data to said devices 80 and 90 and receiving data wirelessly from these devices 80 and 90. The levelling diagnostic system 300 can read in, process and output data of the levelling system 40. For example, the levelling diagnostic system 300 can read in sensor and actuator (control) data and/or data from the process control unit 45A of the levelling system 40 and outputs information on the mobile device 80 to the machine operator or a construction site supervisor what is wrong and which adjustments have to be done, whereby it is conceivable to output the information also on the operating and monitoring unit 45B.

[0065] As a result, a machine operator or construction site supervisor always has an overview of the paving process and can react immediately in the event of problems.

[0066] FIG. 2 shows a road finishing machine 10 illustrated schematically in a side view, comprising a control platform 11, a material bunker 12 and a screed 15 as a tool, which is movable attached to the machine chassis via two tow arms 13R (right machine side) and 13L (left machine side, non-depicted). During the paving drive, the road finishing machine 10 moves on the underground to be asphalted 21, whereby paving material is transported from the material bunker 12 via a non-depicted conveyor device underneath the control platform 11 through the chassis of the road finishing machine 10 to the rear to the screed 15 by which it is processed into a new pavement layer 22.

[0067] The road finishing machine 10 comprises a levelling system 40 as described above, with at least the following entities, namely a distance sensor 41R as a single sensor and a levelling system control unit 45R, consisting essentially of a process control unit 45RA and an operating and monitoring unit (control and display device) 45RB as already described above. The distance sensor 41R (arranged at the right side of the screed 15) may be an ultrasonic sensor measuring a distance/height s1R to the underground 21, i.e., it measures a distance substantially perpendicular to the underground 21. The sensor 41R, the levelling system control unit 45R, the process control unit 45RA and the operating and monitoring unit (control and display device) 45RB are marked by an R, since all components are arranged at one side, here the right side of the screed 15. The sensor 41R is connected via cable connection 41k to the process control unit 45RA.

[0068] As shown in FIG. 2, a support mechanism 60R is arranged at the right side of the road finishing machine 10. The distance sensor 41R is advantageously arranged at a main support mechanism 61R, which is releasable attached to the right side of the screed 15.

[0069] The distance sensor 41R has the purpose to determine an actual height position of the right side of the screed 15, which can be monitored and controlled. In detail, typically, the actual distance value is compared to a respective set point for the right side, so that the tool 15 can be adjusted with regard to its height at the right side. Expressed in other words, this means that the levelling system 40 is used to control the height of the screed 15.

[0070] The road finishing machine 10 in FIG. 2 comprises furthermore a levelling diagnostic system 300 as described above for FIGS. 1a-d.

[0071] FIGS. 3, 4 and 5 show the road finishing machine 10 according to FIG. 2, comprising a levelling system 40R with four distance sensors 41R to 44R. It is also conceivable that are only three distance sensors 41R, 43R and 44R arranged, which scan an underground 21 still to be processed and a new pavement layer 22. The sensor system 40R thus comprises at least two distance sensors 41R, 42R and/or 43R in front of the screed 15, which scan the still to be processed underground 21 and determine distance values s1R, s2R and/or s3R to the underground 21 still to be processed, as well as a further distance sensor 44R, which scan the newly laid or new built-in road surface 22 and determines a distance value s4R to the newly laid or newly installed road surface 22.

[0072] A support mechanism 60R for the levelling system 40R is advantageously arranged at two points at the right tow arm 13R of the road paver 10. Advantageously, the main support mechanism 61R is releasable secured both in the front region of the tow arm, for example in the immediate vicinity of the tow point, by means of a holder 62R and in the rear region, for example in the immediate vicinity of the attachment of the screed 15, by means of a holder 63R. On the main support mechanism 61, which extends along the direction of travel of the paver 10, further releasable secured and along the main support mechanism 61R slideable holders 64R are arranged, by means of which individual distance sensors 41R to 44R of the sensor system (measurement system/levelling system) 40R are held. For further (fine) adjustment of the outer distance sensors 41R and 44R further releasable secured and displaceable holders 65R are provided. Advantageously, the main support mechanism 61R consists of individual or individually connectable mechanical parts or even by means of a twisting mechanism rotatable items or even telescopic items in order to adjust the system in length individually. For known sensor and levelling systems, variable lengths in the range of 9 to 13 meters are common.

[0073] The levelling system 40R comprises a levelling system control unit 45R, consisting essentially of a process control unit 45RA and an operating and monitoring unit (control and display device) 45RB as already described above. The individual distance sensors 41R to 44R are advantageously connected via cable connections 41k to 44k to the process control unit 45RA, which reads in and processes the measured distance values s1R to s4R of the distance sensors 41R to 44R. Furthermore, the process control unit 45RA controls the height position of the screed 15 as a function of the measured distance values s1R to s4R, that means the process control unit 45RA functions as a levelling unit. Via the operating and monitoring unit 45RB, an operator, for example the paver screed personnel, can set adjustments or changes to various parameters concerning the levelling or monitor them during the installation process. The operating and monitoring unit 45RB serves as a so-called human-machine interface (HMI or MMI). In an advantageous variant, the process control unit 45RA and the operating and monitoring device 45RB are combined in one device or in one housing (as described above), that means components are integrated within one device or housing.

[0074] FIG. 4 show the road finishing machine (paver) 10 illustrated schematically in a bird view, comprising two levelling systems 40L and 40R as described above, whereby each levelling system 40L and 40R comprises four distance sensors 41L/R . . . 44L/R. With these two levelling systems 40L and 40R each machine/tool side (left/right) is controlled (levelled) separately. As already described above, via the operating and monitoring units 45LB and 45RB, the operator, for example the screed personnel, can set adjustments or changes to various parameters concerning the levelling. For instance, the operator can make adjustments manually with regard to the set point of the sensor system (measurement system/levelling system) 40L and/or 40R.

[0075] The road finishing machine 10 comprises furthermore an additional sensor device 200, for instance a cross-slope sensor 200, which is arranged above the main screed 15M, advantageously on a crossbeam attached to the screed 15. The cross-slope sensor 200 measures the inclination of the screed 15 transverse to the direction of travel of the road finishing machine 10. The additional sensor device 200 would input into the control loop of one of the levelling systems 40L or 40R, as described in EP 3 795 748 A1.

[0076] Regarding the distance sensors 41L/R . . . 44L/R it should be noted that these may be ultrasonic control units, as described in EP 0 542 297 A1 or EP 0 547 378 A1. These sensors typically use three or four ultrasonic sensors because of the fact that the ultrasonic sensors scan the surface at a plurality of widely spaced points, so that elongated bumps in particular are well-balanced.

[0077] The road finishing machine 10 in FIGS. 3, 4 and 5 comprises furthermore a levelling diagnostic system 300 as described above for FIGS. 1a-d.

[0078] FIG. 5 shows the road finishing machine 10 with an additional wireless communication interface, as described above for FIG. 1d. The levelling system 40L or 40R is connected to the levelling diagnostic system 300, which is for example a software product (App), running on a remote data server system 90 or on a mobile device 80.

[0079] Although the present invention has so far been explained mainly with reference to a road finishing machine, it can also be used on road milling machines.

[0080] FIG. 6 shows a road milling machine 10 illustrated schematically in a side view, comprising a milling drum/milling unit 15 as tool, which is rigidly (fixed) connected/coupled to the chassis 17 (machine body or machine frame) of the road milling machine 10. The road milling machine 10 has two front and two rear landing gears 16F and 16R, whereby in FIG. 6 only the left front and the left rear landing gears 16F and 16R are shown. The road milling machine 10 comprises a levelling system 40L, which consists of three distance sensors 41L, 43L and 44R, which are coupled to the chassis 17 (machine body or machine frame) of the machine 10 and which scan an underground 21 still to be milled and a milled road surface 22. The levelling system 40L thus comprises at least two distance sensors 41L and 43L in front of the milling drum/milling unit 15, which are arranged at a distance a from each other and scan the still to be milled underground 21 and determine distance values to the underground 21 still to be milled, as well as a further distance sensor 44L, which is arranged at a distance a from sensor 43L and scan the milled road surface 22 and determines a distance value to the milled road surface 22. The basic structure of the levelling system 40L shown schematically in FIG. 6 essentially corresponds to the system known from the known technology as described in EP 0 547 378 A1. The sensors 41L, 43L and 44R scan the surface at a plurality of widely spaced points, so that elongated bumps in particular are well-balanced.

[0081] The levelling system 40L further comprises a levelling system control unit 45L, consisting essentially of a process control unit 45A and an operating and monitoring unit (control and display device) 45B. The individual distance sensors 41L, 43L and 44L are advantageously connected via cable connections (not shown) to the process control unit 45A, which reads in and processes the measured distance values of the distance sensors 41L, 43L and 44L. Furthermore, the process control unit 45A controls the height position of the milling drum/milling unit 15 as a function of the measured distance values, that means the process control unit 45A functions as a levelling unit. Via the operating and monitoring unit 45B, a machine operator, for example the milling machine personnel, can set adjustments or changes to various parameters concerning the levelling or monitor them during the milling process. The operating and monitoring unit 45B serves as a so-called human-machine interface (HMI or MMI). In an advantageous variant, the process control unit 45A and the operating and monitoring unit 45B are combined in one device or in one housing, that means components are integrated within one device or housing, as described above for FIGS. 1c and 1d.

[0082] The road milling machine 10 in FIG. 6 comprises furthermore a levelling diagnostic system 300 and an additional wireless communication interface, both have already described above for FIGS. 1a-d. The levelling system 40L is connected to the levelling diagnostic system 300, which is for example a software product (App), running on a remote data server system 90 or on a mobile device 80.

[0083] According to embodiments, sensor data from a layer thickness measurement system, especially from pavement thickness measurement system can be used additionally or alternatively to the sensor data from the leveling system.

[0084] Additionally, it should be noted that analogously to the sensor values process control parameters, like a pavement material information or an environment temperature may be used. For example, these process control parameters may be received as an input from the operator.

[0085] Although some aspects have been described in the context of an apparatus, it is clear that these aspects also represent a description of the corresponding method, where a block or device corresponds to a method step or a feature of a method step. Analogously, aspects described in the context of a method step also represent a description of a corresponding block or item or feature of a corresponding apparatus. Some or all of the method steps may be executed by (or using) a hardware apparatus, like for example, a microprocessor, a programmable computer or an electronic circuit. In some embodiments, some one or more of the most important method steps may be executed by such an apparatus.

[0086] Depending on certain implementation requirements, embodiments of the invention can be implemented in hardware or in software. The implementation can be performed using a digital storage medium, for example a floppy disk, a DVD, a Blu-Ray, a CD, a ROM, a PROM, an EPROM, an EEPROM or a FLASH memory, having electronically readable control signals stored thereon, which cooperate (or are capable of cooperating) with a programmable computer system such that the respective method is performed. Therefore, the digital storage medium may be computer readable.

[0087] Some embodiments according to the invention comprise a data carrier having electronically readable control signals, which are capable of cooperating with a programmable computer system, such that one of the methods described herein is performed.

[0088] Generally, embodiments of the present invention can be implemented as a computer program product with a program code, the program code being operative for performing one of the methods when the computer program product runs on a computer. The program code may for example be stored on a machine readable carrier.

[0089] Other embodiments comprise the computer program for performing one of the methods described herein, stored on a machine readable carrier.

[0090] In other words, an embodiment of the inventive method is, therefore, a computer program having a program code for performing one of the methods described herein, when the computer program runs on a computer, a mobile process control computer or the like.

[0091] A further embodiment of the inventive methods is, therefore, a data carrier (or a digital storage medium, or a computer-readable medium) comprising, recorded thereon, the computer program for performing one of the methods described herein. The data carrier, the digital storage medium or the recorded medium are typically tangible and/or non-transitionary.

[0092] A further embodiment of the inventive method is, therefore, a data stream or a sequence of signals representing the computer program for performing one of the methods described herein. The data stream or the sequence of signals may for example be configured to be transferred via a data communication connection, for example via the Internet.

[0093] A further embodiment comprises a processing means, for example a computer, or a programmable logic device, configured to or adapted to perform one of the methods described herein.

[0094] A further embodiment comprises a computer having installed thereon the computer program for performing one of the methods described herein.

[0095] A further embodiment according to the invention comprises an apparatus or a system configured to transfer (for example, electronically or optically) a computer program for performing one of the methods described herein to a receiver. The receiver may, for example, be a computer, a mobile device, a memory device or the like. The apparatus or system may, for example, comprise a file server for transferring the computer program to the receiver.

[0096] In some embodiments, a programmable logic device (for example a field programmable gate array) may be used to perform some or all of the functionalities of the methods described herein. In some embodiments, a field programmable gate array may cooperate with a microprocessor in order to perform one of the methods described herein. Generally, the methods may be performed by any hardware apparatus.

[0097] While this invention has been described in terms of several embodiments, there are alterations, permutations, and equivalents which will be apparent to others skilled in the art and which fall within the scope of this invention. It should also be noted that there are many alternative ways of implementing the methods and compositions of the present invention. It is therefore intended that the following appended claims be interpreted as including all such alterations, permutations, and equivalents as fall within the true spirit and scope of the present invention.