Paving system and method

• US 7,946,787 B2
• Filed: 06/27/2008
• Issued: 05/24/2011
• Est. Priority Date: 06/27/2008
• Status: Active Grant

• Current Assignee: Caterpillar Incorporated
• Original Assignee: Caterpillar Incorporated
• Inventors: Glee, Katherine C., Donnelli, Aaron
• Primary Examiner(s): Addie; Raymond W
• Application Number:
  US12/215,472
• Publication Number:
  US 20090324331A1
• Time in Patent Office: 1,061 Days
• Field of Search: 404 82- 85
• US Class Current: 404/84.8
• CPC Class Codes: E01C 19/004 Devices for guiding or controlling the machines along a predetermined path for graders or bulldozers E02F3/841; for other soil-shifting machines E02F9/2045
• CPC Class Codes: E01C 19/48 for laying-down the materials and consolidating them, or finishing the surface , e.g. slip forms therefor, forming kerbs or gutters in a continuous operation in situ E01C19/002, E01C23/065 take precedence; devices for guiding or controlling the machines along a predetermined path E01C19/004
• CPC Class Codes: E01C 23/07 Apparatus combining measurement of the surface configuration of paving with application of material in proportion to the measured irregularities measuring means only E01C23/01 G01B

Abstract

A paving system includes a machine having a frame with a plurality of ground-engaging elements coupled with the frame, and a height adjustable screed coupled with the frame. The paving system may also include a paving control system having a receiver configured to receive screed control data indicative of a position of the height adjustable screed relative to a reference position. The paving control system may further include a computer readable memory storing a control algorithm, which may include a smoothness estimating algorithm and a screed adjusting algorithm. An electronic control unit is coupled with the computer readable memory and is configured via the control algorithm to determine a smoothness value for a region of a mat of material which corresponds with an irregular pattern of screed position, in response to screed control data received via the receiver.

Claims

1. A method of operating a paving system comprising the steps of:

outputting screed control commands from an electronic control unit of the paving system to vary a position of a paving machine screed relative to a reference position during paving a mat of paving material;

receiving screed control data with a receiver of the paving system coupled with the electronic control unit, the screed control data being indicative of an irregular pattern of screed position assumed in response to the screed control commands, and including data indicative of a profile of deposited paving material positioned coincident with the screed; and

determining a smoothness value via the electronic control unit, responsive to the screed control data, for a region of a mat of paving material which corresponds with the irregular pattern of screed position.

2. The method of claim 1 wherein the step of receiving includes receiving data from at least one sensor resident on the paving machine.

3. The method of claim 2 wherein the step of receiving further includes receiving at least one of, input data for determining screed control commands for controlling the screed and response data indicative of a response of the screed to the screed control commands.

4. The method of claim 3 wherein the step of receiving further includes receiving the input data from a plurality of averaging ski sensors of the paving machine, the method further comprising a step of outputting the screed control commands responsive to the input data.

5. The method of claim 4 wherein the step of receiving includes receiving the response data from at least one screed tow arm sensor of the paving machine, and wherein the step of determining a smoothness value includes determining the smoothness value based in part on the input data and in part on the response data.

6. The method of claim 5 wherein the step of receiving further includes receiving at least one of, velocity data, acceleration data and position data.

7. The method of claim 2 wherein the step of determining a smoothness value further comprises determining an expected smoothness value based also in part on an expected response of the mat of material to compactor interaction therewith.

8. The method of claim 2 further comprising the steps of:

paving a surface with the mat of material, including paving the surface with a first lift of paving material and paving the surface with a second lift of paving material, wherein the step of determining a smoothness value includes determining a smoothness value for the first lift of paving material; and

receiving additional screed control data indicative of an irregular pattern of screed position relative to a reference position during paving the surface with the second lift of paving material, and determining a smoothness value for the second lift of paving material, in response to the additional screed control data.

9. The method of claim 8 further comprising the steps of comparing the smoothness value for the first lift of material with the smoothness value for the second lift of material, and outputting a smoothness progress signal based on comparing the smoothness values.

10. The method of claim 2 further comprising the steps of receiving position data associated with the region of the mat of material which corresponds with the smoothness value and outputting a smoothness mapping signal based on the position data and the corresponding smoothness value.

11. A paving control system comprising:

a receiver configured to receive screed control data indicative of a plurality of different positions at a plurality of different times of a height adjustable screed of a paving machine relative to a reference position during paving a surface;

a computer readable memory storing a control algorithm comprising computer executable code; and

an electronic control unit coupled with the receiver and with the computer readable memory, the electronic control unit being configured via executing the control algorithm to determine a smoothness value for a region of a mat of material which corresponds with an irregular pattern of screed position defined by the plurality of different positions at the plurality of different times, in response to the screed control data;

wherein the screed control data further includes data indicative of a profile of paving material deposited on the surface and positioned coincident with the screed, and the electronic control unit being further configured to determine the smoothness value responsive to the data indicative of a profile.

12. The paving control system of claim 11 wherein the receiver is further configured to receive position data associated with the region of the mat which corresponds with the smoothness value, and wherein the electronic control unit is configured via executing the control algorithm to output a smoothness mapping signal based on the smoothness value and the position data.

13. The paving control system of claim 11 wherein the control algorithm further includes a smoothness estimating algorithm and a screed adjusting algorithm, the electronic control unit being configured via executing the smoothness estimating algorithm to determine the smoothness value, and further configured via executing the screed adjusting algorithm to control a height of the screed, in response to the screed control data.

14. The paving control system of claim 13 wherein the control algorithm includes an expected response term corresponding to an expected response of the mat of material to compactor interaction therewith, the electronic control unit being further configured via executing the smoothness estimating algorithm to determine the smoothness value for the mat of material based in part on the expected response term.

15. The paving control system of claim 11 further comprising a set of sensors coupled with the receiver and configured to output the screed control data, including a first subset of sensors configured to couple with an averaging ski of the paving machine and a second subset of sensors configured to couple with a screed tow arm of the paving machine.

16. A paving system comprising:

a machine including a frame and a height adjustable screed coupled with the frame;

a receiver configured to receive screed control data indicative of an irregular pattern of screed position relative to a reference position, for the height adjustable screed;

a set of screed height actuators coupled with the height adjustable screed; and

an electronic control unit configured to output control commands to the screed height actuators to vary a position of the screed relative to a reference position, the electronic control unit further being in communication with the receiver and configured to receive the screed control data during paving a surface with a mat of material via the paving system, and the electronic control unit being further configured to determine a smoothness value for a region of the mat of material which corresponds with the irregular pattern of screed position and includes material of the mat positioned coincident with the screed, in response to the screed control data, and to output a signal based on the smoothness value.

17. The paving system of claim 16 wherein the machine includes a paving machine having a frame, a plurality of ground engaging elements coupled with the frame and a tow arm coupling the screed with the frame.

18. The paving system of claim 17 wherein the paving machine includes a set of sensors resident thereon and configured to sense a parameter associated with the screed control data.

19. The paving system of claim 18 further comprising a display coupled with the electronic control unit, wherein the receiver is configured to receive position data associated with the region of the mat of material, and wherein the electronic control unit is configured to output a smoothness mapping signal to the display, in response to the smoothness value and the position data.

20. The paving system of claim 16 further comprising a computer readable memory coupled with the electronic control unit and configured to store a first smoothness value for a first lift of paving material and a second smoothness value for a second lift of paving material, wherein the electronic control unit is configured to compare the first smoothness value with the second smoothness value and includes a memory writing device for recording a smoothness progress value on the computer readable memory in response to comparing the first and second smoothness values.