EP3382099A1 - Road finisher with heating element for a screed - Google Patents

Abstract

A paver (1) comprises a generator (G), a control device (15) and a screed (3), the screed (3) comprising a base board (9) and being capable of being removed by selectively attaching or removing broadening parts (11 , 13) from a first to at least a second, different therefrom screed configuration to be rebuilt. The base board (9) and the widening parts (11, 13) each comprise a compacting unit (7) and an electric heating element (27) which can be supplied with power by the generator (G) for heating the compacting unit (7) to adhere the installation material to the compacting unit ( 7) to prevent and manufacture a high-quality road surface. The control device (15) is configured to individually switch on or off, depending on the screed configuration determined by the control device (15), each of the two heating wire windings (41) of the heating element (27) of the base screed (9) to be triggered by the generator (G ) distributed electric power to the individual Heizdrahtwicklungen (41).

Description

The present invention relates to a road paver with heating element for a screed.

For road finishers, it is known the screed with the compression units, such. As tamper, Glättbleche and pressure bars to heat electrically. These components must be heated to prevent sticking of the also heated paving material. The temperature of the paving material in the processing state is approx. 160 - 185 ° C. On the screed of the paver therefore heating elements with Heizdrahtwicklungen are mounted, which preheat the screed prior to installation operation to the required operating temperature, and maintain this during the installation operation. The power and voltage supply of the heating elements is usually carried out by a generator which is driven by a prime mover, usually a diesel engine. In order to limit the power consumption or the energy consumption of the screed heating, it is known, individual heating elements of different screed segments clocked, ie alternately, to operate, as for example in the EP 1 036 883 B1 is described. Like in the EP 1 295 990 A2 the timing can also take into account the temperature of the screed segments. From the EP 1 555 348 B1 In addition, heating elements are known, which comprise a plurality of heating coils or Heizdrahtwicklungen, wherein the heating power of each of the heating coils of the nominal heating power of the heating element corresponds, which provides a redundancy in case of failure of a heating coil. In addition, a generator due to different engine speed provide variable electrical power, as in WO 2014/124545 A1 is described.

However, the aforementioned variants have deficits in operating the heating elements and the generator in an optimal efficiency and at the same time to make the best possible use of the performance of the existing components. Thus, in particular during the heating phase of the screed other demands placed on the generator and heating elements, as is the case during installation operation. Furthermore, screeds are known in various configurations. Thus, in addition to road pavers with screeds of fixed working width, there are also road pavers with screeds of variable working width. Such screeds usually comprise a fixed size ground beam which can be dimensionally changed by selective attachment or removal of broadening members to produce the particular desired road width. This size change also requires a heating power adjustment of the screed heating. The US 8,961,064 B2 describes a heating system for a screed with detection of attached widening parts. After all reveals that EP 3 075 909 A1 a road construction machine with a network in which a part of a power line is used for data transmission.

The present invention has the object to eliminate the above problems and to provide a paver with a screed, which optimally exploits the generator and line capacity due to its design and control.

This object is achieved by a paver with heating element for a screed according to claim 1 and a method for heating compression units of a screed paver according to claim 16. Advantageous developments of the invention are specified in the dependent claims.

According to one aspect of the present invention, a road paver includes among other elements a generator, a control device and a screed, the screed compacting units, such as. As tamper, Glättbleche and pressure bars, and at least one of the generator with power supplyable electric heating element for heating the compression units comprises. The screed preferably mounted interchangeably on a tractor of the paver includes at least one base board and is adapted to be converted from a first to at least a second, different screed configuration by selectively attaching or removing broadening members, which may be detachable extension members of fixed length or sliding extension members to become. Thus, left and right pull-out elements, which are already connected to the base pile, be pulled out to obtain a larger working width. However, the broadening parts can also be in variants, which are first attached to the base board and / or on Ausziehelementen and fixed to widen the screed. The broadening can also take place by a plurality of pull-out elements and / or supplementary elements per side, and these can be fastened to one another and / or to the base pile.

The heating element is designed as an electrical resistance heating element and comprises at least two mutually current and voltage insulated Heizdrahtwicklungen which, controlled by the control device, individually switched on and off. The control device is configured such that it performs the circuit of Heizdrahtwicklungen in response to a previously determined screed configuration to distribute generated by the generator electrical power to the individual Heizdrahtwicklungen. In particular, the configuration, ie the type, the size and the structure of the screed is determined to at least the base pile, the Heizdrahtwicklungen the one or more heating elements individually to switch. Thus, the electric power provided by the generator can already be distributed on the base board on the individual Heizdrahtwicklungen.

This offers the advantage of being able to design the heating of the compression units as homogeneously as possible, depending on the arrangement of the heating wire windings, which also reduces unwanted heat loss and thus increases the efficiency. This not only reduces the operating costs but also increases the processing or production quality. Since individual Heizdrahtwicklungen be operated in combination with each other and this can also be arranged adapted to the plank geometry, the single Heizdrahtwicklung for a more narrow heating power range, i. a range of electrical power to be dimensioned, which on the one hand prevents low efficiency in the application of low electrical power and on the other hand prevents material weakening at high electrical power.

In an advantageous variant, the heating element with its two or more Heizdrahtwicklungen is formed like a module and removably attached to the screed or the compression units. This allows easy handling of the heating element in case of necessary repairs or replacement. Thus, the operation can be continued with a replacement heating element when a heating element requires repair. Also, the use of different alternative heating elements with different power consumption is conceivable to change over to different operating conditions, such as a summer or winter operation.

In a typical variant, the control device is configured to individually switch on or off, depending on the screed configuration, each of the heating wire windings of the widening parts. If the screed configuration, ie the size and type of the base screed and, if present, the widening parts, has been determined by the control device at the start of operation, then this switches the heating wire windings of the heating elements of widening parts as on the base screed individually and as a function of the desired heating characteristic. Thus, for all components of the screed can be made effective and adapted to the operating parameters heating.

It would be particularly advantageous to dimension the heating wire windings of a heating element in the sense of a main winding and an additional winding for different power ranges. For example, the main winding may be designed for two thirds and the auxiliary winding for one third of the total possible heating power. This allows operation of the heating element in four stages, namely zero, one third, two thirds and three thirds of the total power.

Thus, depending on the design, different heating power stages can be provided which, as described below, can be further varied by means of additional parameters. By such an embodiment, the specific heating power, i. the heating power per area, be varied particularly appropriate. The design-related planning of different heating power ranges makes it possible to adapt the heating wire properties, such as the wire diameter, in order to ensure a heating process with the highest possible efficiency and low material load.

Preferably, the controller is configured to automatically determine the screed configuration. The control device, which can be implemented as a microcomputer with appropriate software, is thus programmed to automatically obtain all the information needed to build the screed automatically at start of operation, for example when switching on the paver or the control panel and to consider for the control of screed heating. The control device asks, e.g. First, the data feed channels and receives the type information of all existing screed components. The components may be connected either by cable and corresponding plug connection or by radio with the control device. The actual identification of the individual screed components can take place in various ways. Thus, weight sensors connected to the controller may serve to determine the screed configuration, or the screed components may be provided with specific ID tags (identification codes) which are read out. The respectively acquired data are then compared in particular with a database stored in the control device, which can be updated by PC interface. The automatic recognition of the screed configuration offers the machine operator a considerable time saving since manual inputs do not have to be made. Only the desired heating program must be set if necessary. By means of additional sensors, such as ambient temperature or screed temperature sensor, additional information relevant for the operation of the screed heating system can be collected, and the control device can then calculate heating programs and propose them to the user.

In a common variant, the paver has a power line communication (PLC) base module and the screed one or more PLC modules, which are configured and interconnected to communicate over the existing power lines. In this case, the control device and / or the PLC base module is configured to detect the structure of the screed by evaluation of the PLC modules by means of PLC data transmission. As is known from other applications, in the case of PLC data transmission, the data signal is additionally transmitted via a carrier frequency to the power line operated with, for example, 230 V or 400 V Heating elements modulated. The PLC basic module and the PLC modules are mounted and interconnected in such a way that the signals are coupled in and out as well as forwarding control commands. The PLC data transmission is a robust transmission technology and reduces the need for further control lines. This reduces the production costs and thus the manufacturing costs and a possible need for repair. If the PLC modules, which are arranged on the screed, also serve as storage units for information on the type and construction of the screed, further electronic components can be effectively saved.

In an advantageous variant, each heating wire winding of the heating element is switched on and off by a switching relay. As described in the previous paragraph, signal transmission by means of a PLC is also a particularly advantageous variant for construction machines. Thus, the circuit of the Heizdrahtwicklungen, so the control of a switching relay, done so. This setup provides robust and reliable control and also the ability to implement later technical enhancements.

In another variant, the paver for each Heizdrahtwicklung a heating element integrated in a Heizelementüberwachungsmodul switching relay for connecting or disconnecting the Heizdrahtwicklung on. Depending on the design of the heating element monitoring module, one may be arranged per heating wire winding. However, it is also possible to connect a heating element monitoring module for monitoring a plurality of heating wire windings or even a plurality of heating elements. Preferably, furthermore, the control device is configured and interconnected to control the switching relay via the power line by means of PLC. It is convenient to combine the circuit functions with the heater monitoring modules to save space and effectively utilize existing components.

In a further variant, each switching relay of a heating element is connected to a separate power line and a separate control line. Induced by the control signal, which is passed to the switching relay, this establishes or interrupts the flow of current to the Heizdrahtwicklung. This allows the use of other signal transmission techniques and the modification of the control line independent of the power supply and vice versa.

Preferably, the components of the screed, so the base board and the widening parts, each having two or more heating elements, wherein the number of heating elements of a component is independent of the rest. Each of the heating elements in particular comprises at least two Heizdrahtwicklungen. This makes it possible to apply different heating powers to different areas of the screed, which leads to an energy saving when different heat losses, for example from Edge areas compared to central areas, occur. The production of smaller modules is also simpler and less expensive, as well as replacement or repair in the event of a technical defect, and also the paving operation can be maintained while the remaining heating elements are operated with greater heating power for compensation. It should be noted that the statements preceding and following in this text apply to both one and more heating elements per component.

In a typical variant, the generator is capable of being operated at variable speed, with the power of the generator increasing with increasing speed. Depending on the speed of the prime mover, usually a diesel engine, so the power and voltage supply of the heating elements can be adapted to the current Heizleistungsbedarf the screed. The continuously variable speed control, together with the other setting options described, makes it possible to adapt the heating power precisely to the ambient conditions and the operating mode. By designing the heating wire windings for specific heating power ranges, the respective heating wire winding can be subjected to voltage or current at a height which permits particularly efficient operation.

In a further advantageous variant, it is possible to use an operating mode of the paver such. For example, "Eco" or "Power" to select. This preset a maximum generator speed or generator power. Depending on the operating mode and thus the available generator power then controls the control device on and off of Heizdrahtwicklungen. For example, in a "power" mode, it may be useful to select a maximum speed for which the generator is appropriate, for example, 1500 rpm to achieve the fastest possible heating of the screed or unfavorable conditions, such as particularly low Ambient temperatures, to compensate. In another situation, it may be necessary to operate the screed heater at a lower than the maximum possible generator speed and therefore to select an "Eco" mode prior to operation which limits the speed to, for example, 1200 rpm. This may be useful to achieve lower fuel consumption or lower noise emissions, or because environmental conditions (e.g., ambient temperature) only require lower heating power requirements.

The operating mode dependent maximum generator power is determined by the control device and is thus distributed evenly by this on the Heizdrahtwicklungen. The circuit of the Heizdrahtwicklungen takes place so that the electrical power as well as possible is exploited. Alternatively or in combination with the maximum speed specification, it is of course also possible to make other setting options known to the person skilled in the art in the operation of an electric generator. For example, the excitation current which generates the magnetic field can be limited. Thus, maximum heating powers of, for example, 35 kW, 31 kW or 25 kW can be set. Since the connection or disconnection of Heizdrahtwicklungen is decisive for the power consumption of the screed and the Heizdrahtwicklungen should be operated in the range of their greatest efficiency, the control device is designed, for example, to turn off Heizdrahtwicklungen if the Heizleistungsbedarf can not be provided in the selected mode. Of course, it is expedient not only the screed heating but also other electrical consumers, such as lighting, control or charging an on-board battery, also with electric power of the same generator, which also serves to power the screed heating to operate. Thus, not all of the electrical power generated by the generator for screed heating is available, the distribution of electrical power to the on-board electronics of the paver can continue to be done by the control device. Alternatively, it is also conceivable to have a second generator or an alternator for supplying the remaining electrical loads driven by the primary drive.

Ideally, the control device is configured to vary the heating power of the heating element or elements depending on a preset time program or switching pattern. Thus, it may be appropriate to clock the individual heating wire windings of a heating element of a left screed segment, i. periodically alternating, with the individual Heizdrahtwicklungen a heating element of a right screed segment on and off. If the heating power requirement due to the given conditions, such as ambient temperature, temperature of the paving material, soil temperature, low, so it comes in conjunction with the heat capacity of the compression units to a low heat dissipation, the clocking leads to energy savings. In addition, this further subdivides the power levels described above to e.g. 1/6 steps of overall performance possible.

In a further variant, the control device is configured to use signals from sensors, which, for. B. the winding temperature, the winding resistance, the speed, or the voltage output of the generator or other variables that indicate a load on the generator to adjust the heating power of the heating element or more heating elements to prevent overloading of the generator. Thus, for the generator but also for the Heizdrahtwicklungen automatic protection against damage caused by excessive current and voltage. This is relevant in case of operating errors, programming errors the control device or the use of unsuitable extension segments. This avoids costly and expensive repairs or replacement of the generator, heating elements or other components. At the same time, however, the heating system can be designed such that the generator monitored by sensors is operated temporarily with its maximum power output by adding additional heating elements, which leads in particular in the heating phase to a shortening of the heating time. The heating system may additionally be designed such that subsequent expansions, eg using a generator with higher power or other heating elements, can also be taken into account electronically.

Figur 1:

eine schematische Ansicht eines Ausführungsbeispiels eines erfindungsgemäßen Straßenfertigers mit beheizbarer Einbaubohle,

Figur 2:

eine schematische Ansicht eines Ausführungsbeispiels eines erfindungsgemäßen Straßenfertigers mit beheizbarer Einbaubohle in einer ersten Bohlenkonfiguration umfassend eine Grundbohle,

Figur 3:

eine schematische Ansicht eines Ausführungsbeispiels eines erfindungsgemäßen Straßenfertigers mit beheizbarer Einbaubohle in einer zweiten Bohlenkonfiguration umfassend eine Grundbohle sowie zwei Verbreiterungsteile,

Figur 4:

eine schematische Ansicht eines Ausführungsbeispiels eines Straßenfertigers mit beheizbarer Einbaubohle, welche ein linkes und ein rechtes Verbreiterungsteil umfasst und mehrere Heizelemente aufweist,

Figur 5:

eine schematische detaillierte Ansicht eines PLC-Moduls und eines Heizelements einer beheizbaren Einbaubohle,

Figur 6:

eine schematische Ansicht der wichtigsten Schritte des Verfahrens, gesteuert durch die Steuervorrichtung.

Embodiments of the invention will be described in more detail below with reference to the figures. Show

FIG. 1:

a schematic view of an embodiment of a road finisher according to the invention with heated screed,

FIG. 2:

1 is a schematic view of an exemplary embodiment of a road finisher according to the invention with a heatable screed in a first screed configuration comprising a base screed;

FIG. 3:

1 is a schematic view of an exemplary embodiment of a road finisher according to the invention with a heatable screed in a second screed configuration comprising a base screed and two widening parts;

FIG. 4:

1 is a schematic view of an embodiment of a road paver with heatable screed, which comprises a left and a right widening part and has a plurality of heating elements,

FIG. 5:

a schematic detailed view of a PLC module and a heating element of a heated screed,

FIG. 6:

a schematic view of the most important steps of the method, controlled by the control device.

Corresponding components are each provided with the same reference numerals in the figures.

Fig. 1 shows an embodiment of a road finisher 1 according to the invention in a schematic view, with a heated screed 3 and a tractor 5. About a fastening mechanism Screeds 3 of different types can be exchangeably attached to the tractor 5. At the bottom of the screed 3 is a compression unit 7, which forms a flat and solid road surface from the paving material. A weight sensor 8, which is attached to the suspension of the screed 3 on the tractor 5, can serve to determine the screed configuration by means of known weight values of the different models of the screed 3.

Fig. 2 shows a schematic view of an embodiment of a road finisher 1 according to the invention with heated screed 3 in a first screed configuration, comprising a base screed 9. From the tractor 5 lead two power lines 25 to the base board 9, which essentially serve to power the screed heating and the double execution already suitable for the supply of additional widening parts. Depending on the required electrical power and a single power line 25 would be possible and sufficient. The first screed configuration shown already has a sufficient width for the desired area of use.

Fig. 3 shows a schematic view of an embodiment of a road finisher 1 according to the invention with heated screed 3 in a second screed configuration, comprising a base board 9 and a left and a right widening part 11, 13. This second screed configuration is used to make wider streets or areas, so for example to asphalt, than in Fig. 2 , The widening parts 11, 13 can be detachably arranged as supplementary elements on the base pile 9 and connected to the base pile 9 via mechanical and / or hydraulic and / or electrical connections 10. In order to illustrate the connections 10, a distance between the base board 9 and the widening parts 11, 13 was shown in the drawing. In fact, the widening parts 11, 13 are arranged flush with the base board 9, since the road surface has to be formed without bumps or ribs. This would occur if there were gaps between the widening parts 11, 13 and the base board 9. The widening parts 11, 13 can also be pull-out elements, which are arranged on the base pile 9 and can be pulled out laterally wholly or partly thereof.

Fig. 4 shows a schematic view of the components and their interconnection of an embodiment of a road paver 1 with heated screed 3. The paver 1 includes the tractor 5 and the screed 3, which includes a base board 9 and here by way of example a left and right widening part 11, 13. Usually, the control device 15, a power line communication (PLC) base module, is mounted on the tractor 5 17 and a control panel 21, which serves on the control station of the paver 1 the operator to control the screed heating. In addition, the tractor 5 comprises a battery 19, which for example provides a 24V power supply and for starting a prime mover, usually a diesel engine, or for supplying the electronic components with the engine off. A generator G is driven by the motor and generates the electrical power for heating the screed 3. Furthermore, a contactor 23 for securing the electronic components is provided.

As shown in the diagram, the power lines 25 serve to supply the heating elements 27, and the control signals of the PLC base module 17 are coupled into the power lines 25. Here, a variant is shown, lead away in the two power lines 25 from the contactor 23 and thus from the generator G to supply one half of the screed 3 with electricity. With suitable dimensioning, however, only a single power line 25 is possible, which leads from the contactor 23 on the tractor 5 to the screed 3 and divides on the screed 3 to the heating elements 27. The heating elements 27 are connected via a PLC module 29 to the power lines 25. The PLC module 29 receives the signals for connecting and disconnecting heating wire windings of the heating elements 27 from the control device 15 or the PLC base module 17 and thus switches a switching relay 31 (FIG. Fig. 5 ) for opening and closing the power supply of the respective Heizdrahtwicklung. In addition to the control panel 21, a second control panel 35 may be present on the screed 3 in order to enable a control directly on the screed 3.

The screed configuration may be determined by the control device 15, for example, by a weight sensor 8 which measures the weight of the screed 3 on its suspension to the tractor 5. Alternatively or additionally, an ID tag 37, which is respectively attached to the base board 9 and widening parts 11, 13, are read out by the control device 15. In this case, the weight sensor 8 or ID tag 37 is connected to the control device 15 and / or the PLC base module 17 by cable, or its data can be read by radio (eg by means of RFID technology). Also, the PLC module 29 may contain the specific information on the type and structure of the screed 3 and the record can be read by the control device 15 or the PLC base module 17. PLC module 29 and ID tag 37 are present not only on the base board 9, but also on widening parts 11, 13, which are connected by mechanical and / or hydraulic and / or electrical connections 10 to the base board 9. If no PLC technology is used, an additional control line 26 can be arranged, which connects the control device 15 to the switching relays 31 (FIG. Fig. 5 ) and transmits the control signal.

Furthermore, a sensor 43 may be attached to the generator G to determine its operating condition and load, e.g. by measuring the winding temperature, speed or output voltage.

Fig. 5 shows a detailed schematic view of a PLC module 29 and a heating element 27 of a heated screed 3. If the heating of the screed 3 controlled by PLC, so passes through the power line 25, the electric current and the control signal to the switching relay 31, which is so with the Power line 25 is connected, that due to the control signal, the switching relay 31 establishes or interrupts the flow of current to the heating element 27. Each switching relay 31 switches one of two heating wire windings 41 of the heating element 27 and is connected to the heating wire 41 by a respective further power line 25. The supply line from the generator G to the switching relay 31 and the PLC modules 29 can be carried out with a suitable choice of the line dimensions by a single power line 25, which shares in front of the PLC modules 29 towards them. Similarly, more than two power lines 25 are conceivable. The electronic circuit within the PLC modules 29 is configured to process the control signals intended for the respective PLC module 29, as is generally known from data transmission. From the switching relay 31 and the PLC modules 29 lead separate power lines 25 to the individual Heizdrahtwicklungen 41. In this case, an LED light 33 may be interposed to indicate the operating state of the Heizdrahtwicklung 41. In addition, the switching relay 31 may be integrated into a heating element monitoring module 32, which provides additional functions for monitoring the screed heating. Preferably, the heating elements 27 are formed in a modular manner, that is, they are together with their Heizdrahtwicklungen designed as a module disassembled and dimensionally stable. The Heizdrahtwicklungen 41 may be encapsulated in a thermally conductive material.

If no PLC communication is used, an additional control line 26 can be arranged, which transmits the control signal to the switching relay 31.

Fig. 6 shows a schematic view of the most important steps of the method 50 for heating compression units 7 of a screed 3, controlled by the control device 15. In step 51, the control device 15 determines the screed configuration, for example on the basis of the weight sensor 8. Thus, for example, a base beam 9 a known Weight of 2.0t and two widening parts 11, 13 of 0.8t each. Since the weights are specific to the individual screed models, the control device 15 can thus determine their configuration and heating performance data. Alternatively, in electronic storage units, the ID tags 37, the screed data is stored and can be read out from the control device 15. Alternatively you can the screed data may also be stored in memory units of the PLC modules 29 or they may be entered by the operator via an interface.

This is followed by a further step 53, in which the maximum possible electrical power of the generator G is determined by the control device 15. The choice of operating mode, e.g. "Eco" or "Power", taken into account in which the maximum available power is limited by limited in the operating mode "Eco" the speed of the generator G to a maximum value or in the operating mode "Power" the technically possible maximum power of the generator G. is allowed.

Following this, in step 55, the control device 15 distributes electric power generated by the generator G to the heating wire windings 41 by turning them on or off. As already mentioned above, a distinction must be made between a maximum electric power available for heating the screed 3 and a maximum generator power, since the generator G usually also supplies other electrical consumers with power. The connection and disconnection of Heizdrahtwicklungen 41 can also be clocked, i. the individual Heizdrahtwicklungen 41 are alternately applied, according to a previously calculated switching pattern, with electrical energy.

Starting from the above embodiments of a road finisher 1 with heated screed 3 many variations of the same are possible. Thus, the screed 3 next to the compaction units 7 as tamper, Glättblechen or pressure bars, and other compression units 7 have. Likewise, the paver 1 can also include screeds 3 fixed working width. The heating elements 27 may be designed differently as needed, wherein the Heizdrahtwicklungen 41 may have different shapes and sizes. Modifications to the power and voltage supply and the control device 15 are possible in many variants. For example, the power supply can be implemented in DC or AC technology.

Claims (18)

Road paver (1) comprising a generator (G), a control device (15) and a screed (3), the screed (3) comprising a base board (9) and being suitable for selectively removing or removing broadening parts (11, 13) to be converted from a first to at least a second, different screed configuration, wherein the base screed (9) and the widening parts (11, 13) each have a compression unit (7) and at least one from the generator (G) can be supplied with electric heating element (27) for heating the compression unit (7), wherein the heating element (27) comprises at least two Heizdrahtwicklungen 41,
characterized,
in that the control device (15) is configured to individually switch on or off, depending on the screed configuration determined by the control device (15), each of the heating wire windings (41) of the heating element (27) of the base screed (9) in order to be switched by the generator (G ) distributed electric power to the individual Heizdrahtwicklungen (41). Road paver according to claim 1, characterized in that the heating element (27) is designed like a module and releasably attached to the screed (3). Road paver according to one of the preceding claims, characterized in that the control device (15) is configured to individually connect or disconnect each of the Heizdrahtwicklungen (41) of the widening parts (11, 13) depending on the screed configuration. Road paver according to one of the preceding claims, characterized in that the Heizdrahtwicklungen (41) of the heating element (27) are adapted to emit different heating powers. Road paver according to one of the preceding claims, characterized in that the control device (15) is configured to automatically determine the screed configuration. Road paver according to one of the preceding claims, characterized in that the control device (15) is configured to detect the structure of the screed (3) by means of weight sensor (8) or ID tags (37). Road paver according to one of the preceding claims, characterized in that the paver (1) has a power line communication (PLC) base module (17) and the screed (3) one or more PLC modules (29) and the Control device (15) and / or the PLC base module (17) is configured to detect the structure of the screed (3) by evaluation of the PLC modules (29) by means of PLC. Road paver according to one of the preceding claims, characterized in that for each heating wire winding (41) of the heating element (27) has a switching relay (31) for connecting or disconnecting the Heizdrahtwicklung (41), wherein preferably the control device (15) is configured and interconnected to control the switching relay (31) via the power line (25) by means of power line communication. Paver according to one of the preceding claims, characterized in that, for each heating wire winding (41) of the heating element (27), a switching relay (31) integrated in a heating element monitoring module (32) for connecting or disconnecting the heating wire winding (41) is provided, wherein preferably the control device ( 15) is configured and connected to control the switching relay (31) via the power line (25) by means of power line communication. Road paver according to one of the preceding claims, characterized in that a separate power line (25) and a separate control line (26) is connected to each switching relay (31) of a heating element (27) and the control device (15) is configured and interconnected, the Switching relay (31) via the separate control line (26) to control. Road paver according to one of the preceding claims, characterized in that the base pile (9) and / or the widening parts (11, 13) each comprise two or more heating elements (27), wherein each of the heating elements (27) comprises at least two Heizdrahtwicklungen (41) , Road paver according to one of the preceding claims, characterized in that the generator (G) is adapted to be operated at variable speed, wherein the power of the generator (G) increases with increasing speed. Road paver according to claim 12, characterized in that depending on the setting of an operating mode of the paver (1) a maximum generator speed is preset and that the Heizdrahtwicklungen (41) in response to a maximum available generator power by the control device (15) are switched on and off , Road paver according to one of the preceding claims, characterized in that the control device (15) is configured to vary the heating power of the heating element (27) or the heating elements (27) in dependence on a preset time program or switching pattern. Road paver according to one of the preceding claims, characterized in that the control device (15) is configured to measure signals from sensors (43), which determine the winding temperature, the winding resistance, the rotational speed or the voltage output and thus the load of the generator (G), to process and adjust the heating power of the heating element (27) or the heating elements (27) to prevent overloading of the generator (G). Method for heating compacting units (7) of a screed (3) comprising screed (3) of a road finisher (1) by means of one or more electrical heating elements (27), the heating elements (27) each comprising at least two heating wire windings (41) and a generator (G) are supplied with power, and wherein a control device (15) controls the heating of the compression units (7),
characterized,
in that the control device (15) determines a screed configuration assumed by the screed (3), in particular the presence of widening parts (11, 13) in addition to the base screed (9), and the maximum possible electrical power of the generator (G) and depending on at least the Screed configuration and preset parameters, the individual Heizdrahtwicklungen (41) on or off to distribute generated by the generator (G) electrical power to the individual Heizdrahtwicklungen (41). A method according to claim 16, characterized in that the control device (15) determines the screed configuration automatically. Method according to one of Claims 16 or 17, characterized in that a switching relay (31) assigned in each case to a single heating wire winding (41) of the heating element (27) is activated by the control device (15) via the power line (25) by means of power line communication is to turn on or off the Heizdrahtwicklung (41).

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