Method and road construction system for dynamically controlling a paving speed of a road paver

Abstract

The disclosure relates to a method for dynamically controlling a paving speed of at least one road paver for a paving process, wherein by a control system functionally connected to the road paver, a paving speed for the road paver adapted to the determined material delivery rate is determined as a function of a variable material delivery rate of a material supply chain supplying the road paver with paving material determined thereby, wherein a pre-compaction performance of at least one pre-compaction element of a paving screed of the road paver is adjusted as a function of the determined paving speed in order to keep a pre-compaction achieved by the pre-compaction element constant. Furthermore, the disclosure relates to a road construction system for a paving process for producing a constant pre-compaction at varying paving speed.

What is claimed is: 
     
         1 . A method for dynamically controlling a paving speed of a road paver for a paving process, the method comprising:
 determining, by a control system functionally connected to the road paver, a paving speed for the road paver as a function of a variable material delivery rate determined for a material supply chain supplying the road paver with paving material; and   adapting a pre-compaction performance of at least one pre-compaction element of a paving screed of the road paver as a function of the paving speed in order to keep a pre-compaction achieved by the at least one pre-compaction element constant.   
     
     
         2 . The method according to  claim 1 , further comprising receiving in the control system a maximum paving speed for the paving process of the road paver entered by a user as a limit condition. 
     
     
         3 . The method according to  claim 2 , wherein the control system, taking into account the determined, variable material delivery rate, determines a maximum possible paving performance by the road paver and thus calculates a separate, maximum paving speed for the road paver as a function of a layer thickness and layer width to be produced by the paving screed. 
     
     
         4 . The method according to  claim 3 , wherein the maximum paving speed calculated by the control system is stored in a vehicle control of the road paver, which is functionally connected to the control system, as a paving speed set value if this is less than or equal to the maximum paving speed entered by the user, or the maximum paving speed entered by the user is stored as the paving speed set value in the vehicle control of the road paver if the maximum paving speed calculated by the control system is greater than the maximum paving speed entered by the user. 
     
     
         5 . The method according to  claim 4 , wherein the control system, by determining a changing material delivery rate, calculates both a correspondingly adapted new maximum paving speed for the road paver and determines a time at which the new maximum paving speed is stored in the vehicle control of the road paver. 
     
     
         6 . The method according to  claim 5 , wherein the new maximum paving speed calculated by the control system is stored in the vehicle control of the road paver as a new paving speed set value, if the new maximum paving speed calculated by the control system is less than or equal to the maximum paving speed entered by the user, or the maximum paving speed entered by the user is stored as the new paving speed set value in the vehicle control of the road paver if the new maximum paving speed calculated by the control system is greater than the maximum paving speed entered by the user. 
     
     
         7 . The method according to  claim 6 , wherein the control system adapts the new paving speed set value as a function of a pre-selected minimum material stockpile and/or as a function of a pre-selected maximum material stockpile of a paving material available in a direct vicinity of the road paver in such a way that the minimum material stockpile is not undercut and/or the maximum material stockpile is not exceeded during the paving process. 
     
     
         8 . The method according to  claim 7 , wherein an initial paving speed of the road paver is defined before a beginning of the paving process and a target layer thickness and a target pre-compaction are stored as process parameters in the control system for the initial paving speed. 
     
     
         9 . The method according to  claim 8 , wherein the initial paving speed is stored in the vehicle control as the paving speed set value at the beginning of the paving process, wherein a change in speed detected on the road paver or a change in speed determined by the control system causes the control system to calculate a correction factor for adapting the pre-compaction performance for a natural change in pre-compaction which can be predicted on based on the change in speed, and to store the correction factor in a screed control of the road paver which uses the correction factor to adapt operation of the at least one pre-compaction element such that a pre-compaction achieved with the change in speed corresponds to the target pre-compaction defined for the initial paving speed. 
     
     
         10 . The method according to  claim 9 , wherein the correction factor is used by the screed control to vary a stroke of the at least one pre-compaction element, to vary an executable contact pressure by the at least one pre-compaction element and/or to vary a speed of the at least one pre-compaction element. 
     
     
         11 . The method according to  claim 9 , wherein a layer thickness deviation from the target layer thickness is calculated by real-time measurement of a produced layer thickness, based on which a layer thickness correction factor is determined and used by the screed control for height control of the paving screed. 
     
     
         12 . The method according to  claim 9 , wherein a pre-compaction deviation from the target pre-compaction is determined by real-time measurement, wherein a compactor vehicle used for post-compaction compensates for the pre-compaction deviation by dynamic post-compaction modulation such that an overall residual compaction deviation is minimized. 
     
     
         13 . The method according to  claim 1 , wherein at least one part of the control system as a cloud-based application detects predetermined construction planning values, and/or dynamic paver and screed process data of the road paver determined during the paving process and, based thereon, calculates at least one target process value and/or at least one correction factor, and transmits the at least one calculated target process value and/or the at least one calculated correction factor to another part of the control system, which provides the at least one calculated target process value and/or the at least one calculated correction factor for the vehicle control and/or the screed control. 
     
     
         14 . A road construction system for a paving process, comprising a control system, a road paver functionally connected to the control system, a logistics system functionally connected to the control system, and at least one material supply chain supplying the road paver with paving material, a variable material delivery rate of which can be detected by the logistics system and can be provided to the control system, wherein the control system is configured to determine a paving speed for the road paver which is adapted to the material delivery rate detected, wherein a pre-compaction performance of at least one pre-compaction element of a paving screed of the road paver is adaptable as a function of the paving speed adapted to the material delivery rate detected in order to keep a pre-compaction achieved by the at least one pre-compaction element constant. 
     
     
         15 . The road construction system according to  claim 14 , wherein the control system is configured to determine a maximum possible paving performance by the road paver, taking into account the material delivery rate provided to it by the logistics system, and to calculate therefrom a maximum paving speed for the road paver as a function of a layer thickness and layer width to be produced by the paving screed, and to store the maximum paving speed calculated by the control system as a paving speed set value in a vehicle control of the road paver functionally connected to the control system, if this is less than or equal to a maximum paving speed entered by a user on the control system as a limit condition, or the control system is configured to store the maximum paving speed entered by the user as a limit condition in the vehicle control of the road paver as the paving speed set value if the maximum paving speed calculated by the control system is greater than the maximum paving speed entered by the user. 
     
     
         16 . The road construction system according to  claim 15 , wherein the control system is configured to calculate both a correspondingly adapted new maximum paving speed for the road paver by determining a changing material delivery rate and to determine a time at which the new maximum paving speed is to be stored in the vehicle control of the road paver. 
     
     
         17 . The road construction system according to  claim 15 , wherein the control system is configured to adapt the paving speed set value as a function of a pre-selected minimum material stockpile and/or as a function of a pre-selected maximum material stockpile of a paving material available in a direct vicinity of the road paver in such a way that during the paving process no less paving material than the minimum material stockpile and/or no more paving material than the maximum material stockpile is available in the direct vicinity of the road paver. 
     
     
         18 . The road construction system according to  claim 14 , wherein a target layer thickness and a target pre-compaction are storable as process parameters in the control system for an initial paving speed of the road paver defined before a beginning of the paving process, wherein the initial paving speed at the beginning of the paving process is storable in a vehicle control of the road paver as a paving speed set value, and wherein the control system is configured, in response to a change in speed detected on the road paver or a change in speed determined by the control system, to calculate a correction factor for adjusting a maximum paving speed in view of a natural change in pre-compaction which can be predicted based on the change in speed, and to store this in a screed control of the road paver, so that the screed control adapts operation of the at least one pre-compaction element based on the correction factor such that a pre-compaction achieved with the speed change corresponds to the target pre-compaction defined for the initial paving speed. 
     
     
         19 . The road construction system according to  claim 18 , wherein the screed control is configured to use the correction factor for varying a stroke of the at least one pre-compaction element, for varying an executable contact pressure by the at least one pre-compaction element and/or for varying a speed of the at least one pre-compaction element. 
     
     
         20 . The road construction system according to  claim 14 , wherein the road paver is configured to carry out a real-time measurement of a produced layer thickness, whereby a layer thickness correction factor resulting as a function of a layer thickness deviation from a target layer thickness detected therefrom can be determined and can be provided to a screed control of the road paver for a height control of the paving screed, and/or the road paver is configured to carry out a real-time measurement of a pre-compaction produced, wherein, as a function of a pre-compaction deviation from a target pre-compaction determined therefrom, a compactor vehicle configured to compensate for the pre-compaction deviation by dynamic post-compaction modulation can be controlled such that a total residual compaction deviation is minimized. 
     
     
         21 . The road construction system according to  claim 14 , wherein at least one part of the control system is available as a cloud-based application and is configured to detect predetermined construction planning values, and/or dynamic paver and screed process data of the road paver determined during the paving process and, based thereon, to determine at least one target process value and/or at least one correction factor, and to transmit the at least one determined target process value and/or the at least one determined correction factor to another part of the control system, which is configured to provide the at least one determined target process value and/or the at least one determined correction value to a vehicle control of the road paver and/or a screed control of the road paver.