Paving Machine Screed Angle of Attack Control
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Solution Overview
Problem
Paving machines face issues with incorrect angle of attack and cross slope of screeds, leading to increased wear on components and mat defects, which existing technologies do not effectively address.
Innovation Solution
A control system that determines the angle of attack and cross slope using sensors on the screed and frame of the paving machine, providing notifications and automatically adjusting the angle to prevent these issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the angle of attack of the screed is not monitored and adjusted, then the paving machine operates without active control, but increased wear on screed plates and tamper bars occurs along with mat defects
Solution Approach 1:
The system performs preliminary detection of angle of attack using sensors before mat defects occur. The controller continuously monitors the angle and provides warnings or automatic adjustments in advance, preventing wear and mat defects before they happen rather than reacting after damage occurs.
Solution Approach 2:
The system implements feedback by continuously measuring the angle of attack with sensors, comparing it to optimal values, and providing feedback through warnings to the operator or automatic adjustments via actuators. This closed-loop feedback ensures the screed maintains the correct angle, preventing component wear and mat defects.
2Ease of operation
If excessive cross slope is present in the screed, then the paving machine can operate with simple structure, but excessive twisting between left and right main frames causes interference between screed components and restricts movement in moving parts
Solution Approach 1:
The system detects cross slope conditions before they cause component interference or movement restrictions. By monitoring the angle of attack and cross slope in advance, the system can warn the operator or automatically adjust the screed position to prevent twisting and component interference before they occur.
Solution Approach 2:
The feedback mechanism continuously monitors cross slope conditions and provides real-time information to the operator or control system. When excessive cross slope is detected, the system feedbacks this information to enable corrective action, preventing component interference and maintaining smooth operation of moving parts.
3Adaptability or versatility
If the angle of attack changes during operation due to various operating conditions, then the paving machine adapts to different conditions, but inconsistent paving material density and mat defects occur
Solution Approach 1:
The system maintains manufacturing precision during adaptability by continuously monitoring the angle of attack with sensors and providing feedback to the control system. When operating conditions cause angle changes that would lead to inconsistent density, the feedback mechanism enables automatic adjustments or operator warnings to maintain the optimal angle, ensuring consistent paving material density despite varying operating conditions.
Solution Approach 2:
The system manages parameter changes by detecting angle of attack variations caused by different operating conditions and automatically adjusting parameters such as screed position or height. This active parameter control ensures that despite changes in operating conditions, the angle of attack remains within optimal ranges, maintaining consistent paving material density and preventing mat defects.
Data Source
AI summary
A method for determining a change in an angle of attack of a screed on a paving machine includes determining a first angle of attack of the screed, determining a second angle of attack of the screed based on data from at least one sensor located on the screed and at least one sensor located on a frame of the paving machine, and determining a change in the angle of attack based on the first angle of attack and the second angle of attack. The method also includes providing a notification of at least one of the first angle of attack, the second angle of attack, or the change in the angle of attack.