Partial-cut-width sensing for cold planar milling
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Solution Overview
Problem
Existing sensor systems for cold planar machines are unable to accurately determine the partial-cut-width of material removal, leading to skewed productivity measurements and inefficient material volume calculations, especially when not all passes extend across the full width of the cutting system.
Innovation Solution
A system comprising a cold planar frame with a cutting tool and a plurality of sensors positioned across the cutting path, a controller determines the partial-cut-width by sensing depth distances across the cut width, calculating differences, and outputting a partial-cut-width indicator, allowing for accurate width determination and improved productivity measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional sensor systems are used for cold planar machines, then the system structure remains simple, but the measurement precision of partial-cut-width is insufficient leading to skewed productivity measurements
Solution Approach 1:
The patent applies segmentation by dividing the cutting width measurement into multiple discrete sensor zones. Instead of using a single complex sensor, the system segments the cutting path into multiple measurement points where individual sensors detect material presence or depth at each segment. This allows accurate partial-cut-width measurement by aggregating data from multiple simple sensor segments, resolving the contradiction between measurement precision and device complexity.
2Productivity
If partial-cut-width sensing is not implemented, then the device complexity remains low, but the productivity measurements become inaccurate due to inability to account for partial cuts
Solution Approach 1:
The patent implements feedback by using sensors to continuously detect partial-cut-width conditions and feeding this information back to the control system. The controller processes sensor data to determine when partial cuts occur and adjusts productivity calculations accordingly. This feedback mechanism enables accurate productivity measurement that accounts for partial cuts, resolving the contradiction between productivity accuracy and device complexity.
Solution Approach 2:
The patent replaces complex mechanical measurement systems with electronic sensor and controller systems. Instead of using mechanical devices to physically measure and calculate partial-cut-width, the system uses electronic sensors to detect material presence and a controller to compute width and productivity metrics. This substitution maintains relatively low complexity while significantly improving productivity measurement accuracy.
3Measurement precision
If multiple sensors are positioned across the cutting path to detect partial-cut-width, then the measurement precision improves, but the device complexity and cost increase
Solution Approach 1:
The patent applies universality by designing a sensor system where multiple sensors serve multiple functions. The same sensors used for partial-cut-width detection also provide data for material presence detection, depth measurement, and productivity calculation. This multi-functionality reduces the need for separate specialized sensors, thereby improving cut width detection precision while limiting the increase in device complexity and cost.
Data Source
AI summary
A system for sensing partial-cut-width in a cold planar machine comprises a frame, a cutting system mounted to the frame comprising a cutting tool extending across a cutting path, sensors positioned across the cutting path, and a controller electronically coupled to the sensors to determine a partial-cut-width of material for the cutting tool. A method comprises sensing depth distances across a cut width of a cutting tool, determining a difference in depth distances, determining a location for the difference in depth distances, determining a portion of the cut width based on the determined location to determine a partial-cut-width.