Asphalt Finisher Material Feed Control for Consistent Screed Supply
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Solution Overview
Problem
Existing road paving machines struggle to appropriately control the speed at which paving material is transported, leading to inconsistent material spread in front of the screed.
Innovation Solution
A control system for a road paving machine that includes sensors and controllers to monitor paving material height and adjust the transport device's speed dynamically, using hydraulic control valves to manage conveyor and screw speeds based on real-time material levels and construction target boundaries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the transport speed is adjusted only after detecting height changes in the material transport system, then the control system remains simple, but the material distribution consistency deteriorates
Solution Approach 1:
The control system predicts the required transport speed based on the detected screed position and planned paving trajectory before material height changes occur. This preliminary speed adjustment ensures that material is delivered to the correct position proactively, maintaining consistent material distribution without waiting for height deviations to be detected.
Solution Approach 2:
The system continuously monitors the screed position relative to the planned paving trajectory and uses this feedback to dynamically adjust the transport speed. This closed-loop control ensures that speed adjustments are made based on actual position information, improving material distribution consistency while maintaining manageable system complexity through efficient sensor-controller integration.
2Manufacturing precision
If the transport speed is adjusted in real-time based on screed position, then the material distribution consistency improves, but the response time delay increases
Solution Approach 1:
The control system calculates the required transport speed in advance based on the detected screed position and the planned paving trajectory. By determining the appropriate speed before material height changes occur, the system eliminates response time delays while maintaining consistent material distribution.
Solution Approach 2:
The system replaces traditional mechanical height-sensing and reactive speed adjustment mechanisms with an electronic control system that uses position detection and computational algorithms to determine transport speed. This substitution enables instantaneous calculation and adjustment, eliminating mechanical response time delays.
3Manufacturing precision
If the screed expansion and contraction is controlled manually, then the operation flexibility is maintained, but the paving width consistency deteriorates
Solution Approach 1:
The control system automatically adjusts the screed expansion and contraction based on the detected paving width and the planned trajectory, eliminating the need for manual intervention. The system serves itself by continuously monitoring position information and making appropriate adjustments to maintain consistent paving width while preserving operational flexibility through programmable parameters.
Solution Approach 2:
The system dynamically changes the screed expansion parameter based on detected position information and planned trajectory requirements. By automatically adjusting this critical parameter, the system maintains consistent paving width while allowing flexibility through programmable control logic that can adapt to different paving scenarios.
Data Source
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AI summary
An object of the present invention is to provide a control system (DS) that can more appropriately control a speed at which a transport device transports a paving material (PV). A control system (DS) of an asphalt finisher (100) including a tractor (1), a hopper (2) that is provided in front of the tractor (1) and that receives a paving material (PV), a screed (3) that levels the paving material (PV) at the rear of the tractor (1) and that is capable of expanding and contracting in a vehicle width direction, and a transport device that transports the paving material (PV) in the hopper (2) to the front of the screed (3) includes a controller (50) that sets a target transport speed which is a target value of a speed at which the transport device transports the paving material (PV) based on information related to a feature (object AP) which defines a boundary line (front boundary line FB) of a construction target range positioned at the front.