Road finishing machine with heating device and method

Abstract

The invention relates to a road finishing machine (1) having a screed (5) designed to produce a road surface (3) and having a heating device (100) with a plurality of heating elements (11, 12, 1n, 21, 22, 2n, 31, 32, 3n). The road finishing machine (1) further comprises at least one generator (17) for supplying power to the heating device (100). The road finishing machine (1) also comprises a control system (8, 8') designed to start the generator (17). The road finishing machine (1) is characterized in that each of the heating elements (11, 12, 1n, 21, 22, 2n, 31, 32, 3n) has at least one temperature sensor (T) for detecting a fault occurring therein. The invention also relates to a method for detecting a fault in a heating element (11, 12, 1n, 21, 22, 2n, 31, 32, 3n) installed in a screed of a road finishing machine (1).

Description

Technical Field

[0001] The invention relates to a road finishing machine according to claim 1. The invention also relates to a method according to claim 16. Background Art

[0002] A road finishing machine is configured to produce road pavement from hot asphalt paving material. To (pre-)compact the paving material, the road finishing machine has a screed plate that is pulled toward the paving drive and maintained at the desired operating temperature by an integrated heating system. The heating system comprises a plurality of heating elements, such as heating rods, installed in respective screed sections to heat the compacted aggregate disposed therein and the compacting plate directed toward the ground. The heating system is supplied with power by the road finishing machine's generator.

[0003] The paving results depend, among other things, on the operability of the heating elements installed in the screed body. Therefore, it is desirable to monitor the operation of the heating elements during paving operations in order to detect a defective heating element as quickly as possible and replace it with an operable heating element.

[0004] EP 3 527 721 A1 discloses a road finishing machine having a power adapter for an electric screed heating device.

[0005] EP 1 295 990 A2 discloses a closed-loop control device for a heating element which is mounted on the screed of a road finishing machine.

[0006] WO 2014 / 124545 A1 discloses a method for heating a screed of a road finishing machine equipped with a heating device, wherein a voltage supplied to a heating element of the heating device is varied in order to change the heating power of the heating device.

[0007] DE 10 2015 012 298 A1 discloses a road finishing machine equipped with a generator that supplies electrical energy for the electric screed heating system of the road finishing machine's screed. The screed heating system includes multiple groups of heating elements associated with various functional components of the screed (e.g., baseplate, vibrators, etc.). Furthermore, an ammeter device is provided that measures the output current of the generator and communicates with the machine control via a data bus. Based on this current measurement, fault diagnosis of the screed heating system can be performed. However, this fault diagnosis, linked to the power supply, makes it difficult to identify the individual defective heating elements, particularly their installation locations, and thus repair work can be cumbersome. This can lead to extended downtime of the road finishing machine on site.

[0008] DE 20 2015 104 723 U1 discloses an electric heating cartridge with integrated temperature control. Summary of the Invention

[0009] The object of the present invention is to provide a road finishing machine and a method by means of which the operation of a screed heating device of a road finishing machine can be better monitored by means of simple structural features.

[0010] This object is achieved by a road finishing machine according to claim 1 and a method according to claim 16 .

[0011] Advantageous developments of the invention are given in the dependent claims.

[0012] The road finishing machine according to the invention comprises a screed embodied to produce a road surface and comprising a heating device having a plurality of heating elements. The road finishing machine according to the invention also comprises at least one generator for supplying power to the heating device and a control system embodied to start the generator.

[0013] According to the invention, each heating element comprises at least one temperature sensor for detecting a fault occurring therein. Based on each temperature measurement performed directly at a heating element, a fault can be detected individually, i.e., a fault of one or several specific heating elements among the heating elements used in the screed.

[0014] Each heating element used according to the present invention is designed to detect the temperature directly present at it during operation of the road finishing machine. This allows for continuous and precise detection of the respective temperature conditions of these heating elements and relays these to the control system for potential fault detection. Consequently, the functionality of all heating elements equipped with temperature sensors on the screed can be individually monitored. This has the advantage of enabling the rapid identification and replacement of defective heating elements, which significantly contributes to the production of high-quality road pavement. Furthermore, the temperature-based diagnostic device according to the present invention can significantly reduce downtime of the road finishing machine.

[0015] In particular, the invention allows a continuous determination of a fault to be performed based on temperature measurements performed directly at the heating elements, independently of any powering of the respective heating elements (which is optionally performed at intervals).

[0016] In an advantageous variant, the temperature sensor is connected to the control system via a gateway configured for signal processing. This is ideally suited as a functional module for connecting the heating elements to the control system for error diagnosis purposes and also for coordinating power distribution to the individual heating elements. The temperature sensor may be connected to a screed distributor, which is designed to receive and transmit the actual temperature values ​​detected by the temperature sensor. While it can primarily be used for power distribution, the screed distributor can also function as a coupling unit (as a transceiver, so to speak) to transmit the corresponding actual temperature values ​​of the heating elements to the control system.

[0017] It would be useful to implement the screed distributor in such a way that the actual temperature values ​​of the individual heating elements received thereat are forwarded to a gateway configured for signal processing and connected to the control system. As a central gateway, this gateway could receive all measurement signals detected at the screed from the screed distributor, in particular the actual temperatures of the individual heating elements, and could optionally forward them in processed form to the control system for use in the individual open-loop and / or closed-loop control sequences executed therein, in particular for error diagnostic functions.

[0018] According to one embodiment, the screed has a plurality of screed sections, each of which has a plurality of heating elements and a gateway configured for signal processing, which connects the temperature sensors arranged therein to a control system. Alternatively, the respective screed sections each have a plurality of heating elements and each have a screed distributor.

[0019] The gateway and / or screed distributor are specifically designed as hardware and / or software components that establish a connection between the respective heating elements and the control system. In particular, the screed distributor is configured as a transceiver to receive temperature conditions continuously measured at the individual heating elements during operation of the road finishing machine and transmit them to the gateway. The gateway can provide the corresponding temperature data received by the screed to the control system in a form that allows the control system to check the operability of the corresponding heating elements based on this data.

[0020] The gateway and / or screed distributor are specifically configured to connect the heating elements installed in the screed to a control system, at least for precise fault diagnosis. The individual temperature values ​​measured at the individual heating elements and received at the gateway or at the screed distributor can be forwarded to the control system via the gateway and / or the screed distributor in processed data form, enabling the control system to perform individual fault diagnosis for each heating element based on these values. The gateway and / or the screed distributor thus serves as a central interface for temperature-based fault diagnosis, designed for data processing between the temperature sensors installed in the screed body at the individual heating elements and the control system.

[0021] Furthermore, the gateway and / or the screed distributor preferably provides the function of converting the corresponding temperature measurement signals received therein into a data form suitable for an open-loop and / or closed-loop process of the screed operation and forwarding them to the control system, in particular based on which the compacting units of the screed can be dynamically activated.

[0022] Preferably, the screed includes a plurality of screed sections, each screed section includes a plurality of heating elements, and each screed section includes a gateway configured for signal processing and connecting the temperature sensors provided therein to a control system, or each screed section includes a plurality of heating elements and a screed distributor connecting the temperature sensors connected thereto to the gateway. The screed distributor may serve as a transceiver before the gateway.

[0023] It is conceivable that the screed comprises three or more screed sections: a central base screed and an extendable section mounted transversely thereto, which can be extended to vary the paving width transverse to the paving drive direction of the road finishing machine. In a variant, additional screed sections in the form of widening sections can be attached to the extendable screed section to produce larger paving widths. Each of the screed sections, which includes a separate gateway or at least one separate screed distributor for the heating elements installed therein, allows the respective heating elements installed in the screed section to be individually monitored and / or activated based on the respective heating conditions measured therein.

[0024] Most importantly, the corresponding gateway or the corresponding screed distributor can be implemented as an integral part of the screed, in particular the corresponding screed sections. Each screed section can be equipped with a separate gateway or a separate screed distributor, which, during operation of the road finishing machine, acts as a central data receiver unit at the respective screed section, receiving the individual sensor measurement values, primarily the temperature measurement signals of the respective heating elements, and optionally forwarding them in a further processed form to the control system for specific functions, in particular for temperature-related error diagnosis functions. The respective gateway or screed distributor, which is integrated into the screed, thus forms a data receiver and data transmitter module, which forwards the measured temperature values ​​received thereto, before the control system, to the control system, optionally in a data-processed form, for the aforementioned temperature-related error diagnosis functions.

[0025] Preferably, the temperature sensor is integrated into each heating element. Thus, each heating element and the temperature sensor form a structural unit, allowing the heating element and the temperature sensor to be easily installed and removed as a compact unit. This offers considerable advantages, particularly during repair and / or maintenance work. Each heating element thus has an input for power supply and an output for temperature detection performed thereon.

[0026] The corresponding heating element can include, for example, a heat, cold and / or semiconductor temperature sensor. The corresponding heating element can be implemented as a heating rod. The temperature sensor can extend along the heating coil arranged therein corresponding to the geometry of the heating rod.

[0027] In particular, all heating elements of the heating system include at least one integrated temperature sensor. This makes it possible to perform very precise temperature measurements at all heating elements installed in the screed. This allows, on the one hand, precise diagnosis of the function of the individual heating elements, and, on the other hand, precise activation of the individual heating elements.

[0028] Advantageously, the temperature sensors are each connected to the gateway or to the screed distributor via a plug connection. In particular, the plug connection can be configured for tool-free installation and removal, so that the respective heating elements can be easily connected and removed individually.

[0029] It is conceivable that the individual temperature sensors are connected to a gateway or to a screed distributor via a common bus system. This network can be connected to the gateway or to the screed distributor via a single plug connection. This reduces the number of cables in the screed.

[0030] According to one embodiment of the present invention, the gateways or screed distributors for the individual screed sections are directly implemented as PLC gateways. This offers improved application possibilities for the screed, both in terms of structure and functionality. In particular, despite the additional sensor elements, the screed design can be made more compact and / or the screed's operating behavior can be better monitored and controlled.

[0031] As a PLC gateway, a gateway or screed distributor implemented as a PLC gateway can modulate the temperature measurement signals received from the individual heating elements onto a power line connected thereto, and the modulated temperature measurement data can be transmitted to the control system via this power line. It is conceivable that the power line used for data transmission for this purpose is formed by at least a section of the power supply line used to power the respective heating element and / or the respective PLC gateway.

[0032] In a variant of the present invention, each PLC gateway is connected to the control system via a PLC line (power line for power line communication). The power line from the generator to the screed could be used as the PLC line, for example, at least in sections. Most importantly, the power line that provides power to the respective heating element could serve as the PLC line. The PLC gateway can be directly connected to such a PLC line, acting as a distributor to the heating element and modulating the temperature measurement data on the PLC line as a PLC gateway to the control system.

[0033] As an alternative or in addition to the PLC line, the gateway can be connected to the control system via a separate data bus system. The data bus system can be implemented as a CAN bus or as an Ethernet connection, for example.

[0034] It is conceivable that the (PLC) gateway is configured as an Internet gateway so that, in addition to transmitting the temperature measurement data to the control system of the road finishing machine, the temperature measurement data occurring at least temporarily during the paving operation of the road finishing machine are also supplementarily transferred to at least one external receiver connected via the Internet, for example to a central construction site management facility, a service center and / or another construction vehicle cooperating with the road finishing machine.

[0035] A (PLC) gateway can be implemented as a VPN gateway. This allows the gateway to be queried for heating element faults and / or activated in a data-protected manner, particularly from outside the construction site (e.g., from a service center). This could be a service center operated by the machine manufacturer, which can transmit service information about individual screed sections to the operator at the construction site via a VPN connection installed with the screed. This reduces machine downtime at the construction site.

[0036] It is conceivable that the (PLC) gateway is configured as a media gateway. In this manner, the gateway can further process the corresponding temperature conditions of the heating elements received at the gateway, in particular critical temperature conditions measured at the gateway, into corresponding voice output signals, which are acoustically transmitted to the operator of the road finishing machine, in particular the operator of the external control platform of the screed, during the paving operation.

[0037] A simple but very practical variant provides that the gateway and / or the screed distributor of each screed section comprises, for all heating elements installed therein, a separate light which is embodied for optically displaying the operability of the respective heating element.

[0038] In an advantageous embodiment, the control system is embodied to identify the respective heating element type of the heating element on the basis of the respective temperature gradient detected by the temperature sensor formed at the heating element (this means taking into account the development of the temperature detected therein over a predetermined period) and to determine for each of the respective identified heating element types a specific expected temperature value, on the basis of which a temperature-based error diagnostic function can be performed.

[0039] For example, to perform fault diagnosis, the control system is configured to compare each desired temperature value determined for a heating element with the actual temperature value detected therein. If the actual temperature of the heating element detected thereby reaches or exceeds the desired temperature determined for that heating element, the heating element is functioning properly. However, if the control system detects that the actual temperature of the heating element detected is lower than the desired temperature determined for that element by a predetermined value, the heating element may be defective. This fault can be displayed to an operator at the external control platform of the road finishing machine on a display provided therein.

[0040] The control system is conveniently implemented to identify the screed section including the screed element based on at least one determined heating element type. For example, the identified heating element type can be used to determine the type of widening section attached for paving. Specifically, the control system is implemented to determine the screed paving width based on the determined heating element type, primarily based on the corresponding type of widening section attached thereby identified. As described above, the control system can utilize the determined screed paving width for various open-loop and closed-loop control processes executed on the road finishing machine.

[0041] In a preferred embodiment, the gateway and / or the screed distributor are configured to supplement the actual temperature values ​​of the heating elements detected by the individual temperature sensors with at least one piece of information about their measurement location and forward these values ​​to the control system as actual temperature-position data. This makes it possible to clearly identify a defective heating element with respect to its installation location and quickly replace it, allowing the road finishing machine to continue paving operations without any significant interruption.

[0042] The operability of the individual heating elements is preferably displayed to the screed operator and / or the driver of the road finishing machine via a display device connected to the control system. This can be achieved, in particular, visually and / or acoustically. It is conceivable that the operability of the individual heating elements can be displayed on a portable display and / or computer unit, for example, a portable operating unit of an external control platform.

[0043] In one advantageous embodiment, the screed plate includes at least one screed plate, wherein the control system is configured to determine a desired temperature value for the screed plate based on a detected actual temperature value of paving material used by the road finishing machine to produce the road pavement, compare the temperature value with the detected actual temperature of the screed plate, and activate power supply to heating elements associated with the screed plate based on the detected actual temperature of the screed plate. To detect the actual temperature of the screed plate, the screed plate may include at least one temperature sensor directly connected to a screed distributor or gateway. It is contemplated that the desired temperature value for the screed plate may be manually adjustable on the road finishing machine.

[0044] In an advantageous embodiment, the control system is configured to determine, based on the detected ambient temperature provided to it, the remaining heating duration for achieving a desired temperature value of the screed plate of the heating element or of an element for heating the screed plate (which can optionally be identified in advance by its temperature gradient). Based on this, an optimal start time for the paving drive can be determined.

[0045] The control system may be configured to check the operability of each heating element in that, upon predetermined power supply to each heating element, the actual temperature value detected thereat will reach the ambient temperature provided to the control system within a predetermined time period (e.g., within one minute), or will exceed it by a predetermined amount.

[0046] Advantageously, the control system is designed to determine the type of heating element and / or the type of the associated screed section, for example, the type of widening portion, based on the detected duration required to heat the heating element to a predetermined temperature level. Thus, the structural design of the screed, in particular the type of the corresponding screed section employed therein, can be indirectly determined by the individually detectable heating duration of at least one heating element.

[0047] According to one embodiment, the control system may be implemented to determine the type of heating element and / or the type of associated screed section, eg the type of widening portion, based on a detected operating temperature of the heating element occurring after a predetermined heating time period.

[0048] Preferably, the control system is configured to determine a screed paving width that can be adjusted for paving operations based on the aforementioned determination of the type of heating element and / or the type of screed segment. According to one embodiment of the present invention, the screed paving width determined by the control system based on temperature measurements performed at the heating elements can be stored as an input variable for at least one open-loop and / or closed-loop control function of the screed of a road finishing machine. For example, based on this, controlled variables and / or control parameters for initiating operation of a lateral material distribution device of the screed can be dynamically adjusted. Thus, the screed structure derived from the temperature measurements can be used to parameterize the control system, for example, to control material distribution in front of the screed.

[0049] In one variant, the control system is designed to determine the minimum temperature of the paving material stored in the hopper of the road finishing machine based on the type of heating elements and / or screed segments derived from the heating duration. According to a preferred embodiment, the minimum temperature can be displayed directly to the driver of the road finishing machine and / or transmitted from the control system of the road finishing machine to a mixer for producing the paving material provided to the road finishing machine.

[0050] According to one advantageous variant, information about the operation of the individual heating elements, such as their respective operating temperatures and / or their installed positions, can be displayed on a display device arranged on the road finishing machine. The display device can be implemented as part of the control system, for example as a display on the driver's control panel and / or a display on an external control panel of the screed. Displaying the operating temperature and / or the results of heating element diagnostics on a smart device is also conceivable. Using such a display device, if a defective heating element is detected, appropriate installation and removal instructions can be displayed.

[0051] The present invention also relates to a method for detecting a malfunction in at least one heating element installed in a screed of a road finishing machine. According to the present invention, the malfunction is detected based on an actual temperature value detected directly at the heating element. For this diagnostic function, the actual temperature value of the heating element can be detected by an integrated temperature sensor and forwarded to a control system, which can then very accurately determine any malfunction in the heating element, if any.

[0052] It is conceivable that during operation of the road finishing machine, all heating elements installed in a screed are continuously or at least temporarily checked for faults based on the corresponding actual temperature values ​​detected therein. For this purpose, the corresponding actual temperature values ​​of all heating elements are detected by temperature sensors integrated therein.

[0053] In one variant, the heating element type of the heating element is identified based on the temperature gradient detected at the heating element, i.e., the heating element's heating rate. Based on the identified heating element type, an expected temperature value suitable for fault diagnosis purposes is determined, wherein fault detection is performed by comparing the expected temperature value with the actual temperature value detected directly at the heating element. If the actual temperature of the heating element detected reaches or exceeds the expected temperature determined for the heating element, the heating element is functioning properly. However, if the control system detects that the detected actual temperature of the heating element is lower than the expected temperature determined for the heating element by a predetermined value, the heating element may be defective. Such a fault can be indicated to an operator at the external control platform of the road finishing machine on a display provided there.

[0054] The actual temperature values ​​of one or more heating elements are preferably transmitted to the control system of the road finishing machine via a screed distributor and / or gateway connected to a temperature sensor. The screed distributor and / or gateway thus receives the respective heating conditions of the heating elements and forwards them to the control system, primarily for diagnostic purposes, optionally in a processed form. These temperature measurements directly in the heating elements allow for more precise diagnosis of their function.

[0055] The screed distributor and / or gateway may supplement the actual temperature value of the heating element detected by the temperature sensor with information about its measurement location and forward this to the control system as an actual temperature-position value. This allows a possibly defective heating element to be clearly identified with respect to its installation location within the screed.

[0056] By turning on the heating devices, the heating elements can each be heated to a remaining actual (final) temperature that is higher than the temperature of the paving material. During operation of the screed, the control system suitably continuously compares the actual temperature values ​​of the individual heating elements with the desired temperature values ​​determined for these heating elements. As long as the actual temperature of each heating element is higher than or equal to the corresponding desired temperature, the heating element is operating correctly. However, if, after a predetermined heating phase, the actual temperature of a heating element falls below the associated desired temperature value by a defined temperature value, the heating element may be defective. This defect can be displayed to the operator via a display device. As an alternative to or in addition to displaying defective heating elements via the display device, it is suitable to configure the control system to shut down any heating element detected as defective (i.e., interrupt the power supply to the heating element to prevent damage to the heating device).

[0057] It is conceivable to additionally display the location of a defective heating element. This can be accomplished by having the screed distributor and / or gateway forward the actual temperature value of the fault to the control system, along with the sender's address. This allows the control system to accurately identify the defective heating element. In one embodiment, the defective heating element is indicated by a status LED provided at the screed distributor and / or at the gateway.

[0058] The control system may perform a type determination based on a heating rate of the heating element measured at the heating element and, optionally, the type of the screed section based thereon, whereby the control system determines an adjustable screed paving width and / or a currently adjusted screed paving width of the screed during the paving operation. Further processing at the road finishing machine, in particular the lateral material distribution ahead of the screed, can be controlled by open-loop or closed-loop control using the determined screed paving width. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] The present invention will be described in more detail with reference to the following drawings, in which:

[0060] Figure 1 A road finishing machine according to the invention is shown,

[0061] Figure 2 A schematic diagram showing a heating device of an embodiment of a road finishing machine according to the present invention, and

[0062] Figure 3 A schematic diagram shows a heating device of an embodiment of a road finishing machine according to the invention.

[0063] Identical components are always provided with the same reference numerals in the figures. DETAILED DESCRIPTION

[0064] Figure 1 A road finishing machine 1 is shown, which produces a road surface 3 from paving material 4 on a subsoil in the direction of paving drive R using a screed plate 5. The road surface 3 has a screed pavement width B transverse to the direction of paving drive R, which is produced according to the screed plate configuration. The screed plate 5 is designed to compact the paving material 4 spread in front of it. The screed plate 5 includes a screed plate 6 and a vibrator 7 arranged in front of the screed plate 6 in the direction of paving drive R.

[0065] Figure 1 The road finishing machine 1 has a driver's control platform F for the driver. On the driver's control platform F, a control system 8 is provided. The control system 8 is configured to control and / or monitor processes performed at the road finishing machine 1. In particular, the operation of the screed 5 can be controlled and its operation monitored via the control system 8.

[0066] Figure 1 It is further shown that an external control platform A is implemented at the screed 5 and has a control system 8' implemented thereon. The screed operator can control and / or monitor the operation of the screed 5 at the external control platform A via the control system 8'. The control system 8 mounted on the driver control platform F and / or the control system 8' mounted at the external control platform A at the screed 5 can be implemented as display devices D, D' to display various process states of the road finishing machine 1 to the driver and / or the screed operator.

[0067] Figure 2 The schematic diagram shows the Figure 1 1 . The heating device 100 of the road finishing machine is shown in FIG. The heating device 100 is embodied as a heating screed 5 . Figure 2 The heating device 100 is shown to include a plurality of screed sections 10, 20, 30. The screed section 10 may be a basic screed section. The two screed sections 20, 30 may be extendable screed sections laterally fixed to the screed section 10. The structure of the heating device 100 shown may include Figure 2 Further screed sections not shown in the drawing, for example optionally with a different width and / or number of screed widenings, are attached transversely to the extendable screed section.

[0068] The screed section 10 includes a plurality of heating elements 11, 12, 1n, each of which includes an integrally mounted temperature sensor T. The temperature conditions of the individual heating elements 11, 12, 1n detected by the temperature sensor T can be forwarded via a signal line 14 to a gateway 15 within the screed section 10. The gateway 15 is configured to process the respective temperature conditions of the heating elements 11, 12, 1n into data format for diagnostic purposes. This data is forwarded from the gateway 15 to the control system 8, 8' via a data line 16, such as a CAN bus system, for diagnostic purposes and optional other control functions.

[0069] The control system 8, 8' is functionally connected to the generator 17 and can initiate its operation based on data received from the gateway 15. The generator 17 is connected to the gateway 15 of the screed section 10 via a power supply line 18. The electrical energy generated by the generator 17 can be distributed via the gateway 15 to the individual heating elements 11, 12, 1n of the screed section 10 in order to heat them individually.

[0070] according to Figure 2 The screed section 10 further includes a temperature sensor 19 for detecting the actual temperature of the screed plate 6 of the screed plate 5. The temperature sensor 19 is connected to the gateway 15. Based on a comparison of the detected actual temperature of the screed plate 6 with a desired temperature value of the screed plate, determined, for example, with reference to the temperature of the paving material or manually adjusted by the screed operator, the control system 8, 8' can dynamically control the power supply to the individual heating elements 11, 12, 1n installed in the screed section 10.

[0071] exist Figure 2 In FIG, the data line 16 and the power supply line 18 are shown as separate lines. The data line 16 can be implemented as a CAN bus system. Alternatively, the power supply line 18 is implemented as a PLC line, wherein the gateway 15 is configured to modulate the respective actual temperature values ​​of the heating elements 11, 12, 1n received from the temperature sensor T of the screed segment 10 onto the power supply line 18 and transmit them to the control system 8, 8'.

[0072] The other screed sections 20 , 30 of the heating device 100 have a comparable design to the screed section 10 .

[0073] The screed section 20 comprises at least three heating elements 21 , 22 , 2n , temperature sensors T mounted thereat, and a gateway 25 receiving the respective temperature conditions of the heating elements 21 , 22 , 2n and forwarding them to the control system 8 , 8 ′ for their functional diagnosis.

[0074] The screed section 30 comprises three heating elements 31 , 32 , 3 n , temperature sensors T mounted thereon, and a gateway 35 which receives the respective temperature conditions of the heating elements 31 , 32 , 3 n and forwards them to the control systems 8 , 8 ′ for their functional diagnosis.

[0075] according to Figure 2 Each screed section 10, 20, 30, and in particular each heating element 11, 12, 1n, 21, 22, 2n, 31, 32, 3n installed therein, can be individually checked for its functionality, since the temperature conditions are detected at all heating elements 11, 12, 1n, 21, 22, 2n, 31, 32, 3n and forwarded via the corresponding gateway 15, 25, 35 to the control system 8, 8' for their functional control, optionally in a processed form. Defective heating elements 11, 12, 1n, 21, 22, 2n, 31, 32, 3n, including their installed positions, can be displayed via the display device D, D'.

[0076] Figure 2 Also shown is an ambient temperature sensor 40, which is implemented to detect the ambient temperature in the area of ​​the screed plate 5. The ambient temperature sensor 40 is connected to the control system 8, 8'. Based on the ambient temperature detected by the ambient temperature sensor 40, the required heating duration until the desired temperature of the screed plate 6 is reached can be determined by the control system 8, 8' and optionally displayed to the operator.

[0077] Figure 2 Also shown is a desired temperature value S, which the control system 8, 8' determines for all heating elements 11, 12, 1n, 21, 22, 2n, 31, 32, 3n based on the heating rates measured at them and which is used during functional diagnosis of the heating elements 11, 12, 1n, 21, 22, 2n, 31, 32, 3n.

[0078] Figure 3 Shows the Figure 2 Compared to a slightly modified embodiment. Figure 3 The screed section 10 is shown to include a screed distributor 15 ′, the screed section 20 includes a screed distributor 25 ′, and the screed section 30 includes a screed distributor 35 ′, the respective screed distributors 15 ′, 25 ′, 35 ′ being connected to the control system 8 , 8 ′ via a gateway 50 shared by them.

Claims

1. A road finishing machine (1), characterized in that include: A screed plate (5) is embodied for producing a road surface (3) and comprises a heating device (100) having a plurality of heating elements (11, 12, 1n, 21, 22, 2n, 31, 32, 3n); at least one generator (17) for providing power to the heating device (100); and a control system (8, 8') embodied for starting the generator (17); characterized in that each of the heating elements (11, 12, 1n, 21, 22, 2n, 31, 32, 3n) has at least one temperature sensor for detecting a fault occurring therein; The control system (8, 8') is implemented to: identify the respective heating element types of the heating elements (11, 12, 1n, 21, 22, 2n, 31, 32, 3n) based on the respective temperature gradients detected by temperature sensors implemented at the heating elements (11, 12, 1n, 21, 22, 2n, 31, 32, 3n), and based on this, determine the respective expected temperature values ​​for diagnosing errors of the heating elements (11, 12, 1n, 21, 22, 2n, 31, 32, 3n).

2. The road finishing machine according to claim 1, characterized in that: The temperature sensor is connected to the control system (8, 8') via a gateway (15, 25, 35) configured for signal processing, or the temperature sensor (T) is connected to a screed distributor (15', 25', 35') designed to receive and forward the actual temperature value detected by the temperature sensor.

3. The road finishing machine according to claim 2, characterized in that: The screed distributors (15', 25', 35') are implemented to forward the actual temperature values ​​received at the respective heating elements (11, 12, 1n, 21, 22, 2n, 31, 32, 3n) to a gateway configured for signal processing and connected to a control system (8, 8').

4. The road finishing machine according to claim 3, characterized in that: The screed plate (5) comprises a plurality of screed plate sections (10, 20, 30), each of the screed plate sections comprises a plurality of heating elements (11, 12, 1n, 21, 22, 2n, 31, 32, 3n) and a gateway (15, 25, 35), the gateway (15, 25, 35) being configured for signal processing and connecting a temperature sensor (T) arranged thereon with a control system (8, 8'), or each of the screed plate sections comprises a plurality of heating elements (11, 12, 1n, 21, 22, 2n, 31, 32, 3n) and a screed plate distributor (15', 25', 35').

5. The road finishing machine according to claim 1, characterized in that: All heating elements (11, 12, 1n, 21, 22, 2n, 31, 32, 3n) of the heating device (100) comprise at least one temperature sensor integrally embodied thereon.

6. The road finishing machine according to claim 2, characterized in that: Each of the temperature sensors is connected to the gateway (15, 25, 35) or to the screed distributor (15', 25', 35') via a plug connection.

7. The road finishing machine according to claim 2, characterized in that: The gateway (15, 25, 35) or the screed distributor (15', 25', 35') is implemented as a PLC gateway.

8. The road finishing machine according to claim 2, characterized in that: The respective gateway (15, 25, 35) or the screed distributor (15', 25', 35') is connected to the control system (8, 8') via a PLC line (18) or via a separate data bus system (16).

9. The road finishing machine according to claim 1, characterized in that: In order to diagnose an error of each of the heating elements (11, 12, 1n, 21, 22, 2n, 31, 32, 3n), the control system is designed to compare the corresponding expected temperature value determined for the heating element (11, 12, 1n, 21, 22, 2n, 31, 32, 3n) with the actual temperature value detected thereat.

10. The road finishing machine according to claim 1, characterized in that: The control system (8, 8') is implemented to identify, based on at least one determined heating element type, a screed portion comprising said heating element type.

11. The road finishing machine according to claim 1, characterized in that: The control system (8, 8') is implemented to identify a screed paving width based on at least one determined heating element type.

12. The road finishing machine according to claim 2, characterized in that: The gateway (15, 25, 35) or the screed distributor (15', 25', 35') is configured to supplement each of the actual temperature values ​​of the heating elements (11, 12, 1n, 21, 22, 2n, 31, 32, 3n) detected by the corresponding temperature sensor with a piece of information about the measured position of the heating element (11, 12, 1n, 21, 22, 2n, 31, 32, 3n) and forward them to the control system (8, 8') as actual temperature-position data for diagnostic purposes.

13. A road finishing machine according to any one of the preceding claims, characterised in that The screed plate (5) comprises at least one screed plate (6), wherein the control system (8, 8') is configured to determine a desired temperature value of the screed plate (6) based on a detected actual temperature value of the paving material (4) used by the road finishing machine (1) provided to it, and to compare it with the detected actual temperature of the screed plate (6) in order to activate the power supply of the heating elements (11, 12, 1n, 21, 22, 2n, 31, 32, 3n) associated with the screed plate (6) based thereon.

14. The road finishing machine according to claim 13, characterized in that: The control system (8, 8') is configured to determine, based on the detected ambient temperature provided to it, a remaining heating duration of the heating elements (11, 12, 1n, 21, 22, 2n, 31, 32, 3n) for heating the screed plate (6) in order to reach a desired temperature value of the screed plate (6).

15. A method for detecting a malfunction of at least one heating element (11, 12, 1n, 21, 22, 2n, 31, 32, 3n) installed in a screed (5) of a road finishing machine (1), characterized in that Fault detection is accomplished based on actual temperature values ​​detected directly at the heating elements (11, 12, 1n, 21, 22, 2n, 31, 32, 3n); The invention relates to a method for detecting a heating element type of the heating element (11, 12, 1n, 21, 22, 2n, 31, 32, 3n) by detecting a temperature gradient at the heating element (11, 12, 1n, 21, 22, 2n, 31, 32, 3n) and determining an expected temperature value for the heating element (11, 12, 1n, 21, 22, 2n, 31, 32, 3n) based on the heating element type, wherein the fault is detected by comparing the expected temperature value with an actual temperature value directly detected at the heating element (11, 12, 1n, 21, 22, 2n, 31, 32, 3n).

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