US 12,104,335 B2
System and method for automatic lowering of a paving machine screed assembly
Chad M. Thiesse, Brooklyn Park, MN (US); Anthony Paul Steinhagen, Maple Grove, MN (US); Ricky Leon Mings, Oak Grove, MN (US); Ronald D. Wilson, Maple Grove, MN (US); Bryan J. Downing, Champlin, MN (US); and Mathew Hedrington, Ham Lake, MN (US)
Assigned to Caterpillar Paving Products Inc., Brooklyn Park, MN (US)
Filed by Caterpillar Paving Products Inc., Brooklyn Park, MN (US)
Filed on Jun. 21, 2021, as Appl. No. 17/353,026.
Prior Publication US 2022/0403607 A1, Dec. 22, 2022
Int. Cl. E01C 19/42 (2006.01); B60K 35/00 (2006.01); B60K 35/22 (2024.01); B60K 35/28 (2024.01); E01C 19/48 (2006.01)
CPC E01C 19/42 (2013.01) [B60K 35/00 (2013.01); B60K 35/22 (2024.01); B60K 35/28 (2024.01); B60K 2360/178 (2024.01); E01C 19/4873 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A paving machine, comprising:
a tractor portion having:
a frame,
a traction system supporting the frame configured to move the tractor portion along a ground surface,
an operator station supported by the frame, and
a plurality of tractor sensors configured to detect the presence of an object in a perimeter zone;
a screed assembly pivotably connected to the frame and configured to be towed behind the tractor portion, the screed assembly having:
a screed frame,
a plurality of screed sensors configured to detect the presence of an object in a primary zone comprising at least a region directly below the screed assembly;
a lifting assembly configured to move the screed assembly from a raised position to a lowered position;
an operator interface configured to receive input from an operator; and
a control module configured to:
receive a lower screed input from the operator interface,
receive a plurality of signals from the plurality of tractor sensors and the plurality of screed sensors,
determine if an object is present in the primary zone or perimeter zone based on the plurality of signals,
automatically prevent or halt lowering of the screed assembly and direct the operator interface to display a warning if an object is detected, and
direct the lift assembly to lower the screed assembly to the lowered position if no object is detected.