Road Paver Screed Feedback Control for Attack Angle Stability
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Solution Overview
Problem
Existing road paver systems fail to maintain a constant attack angle during operation, leading to uneven paving results and increased manual monitoring requirements, as they rely solely on adjusting the screed height without considering changes in attack angle caused by screed height, installation speed, and paving material properties.
Innovation Solution
A road paver system equipped with a feedback control device that continuously measures and adjusts both the screed height and attack angle using a multi-variable controller, independent of installation speed, to maintain a constant attack angle, thereby improving longitudinal and transverse evenness and compaction quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If only the screed height is continuously adjusted by adjusting the leveling cylinder, then the screed height can be controlled, but the attack angle is not constant and varies with paving material properties and environmental conditions
Solution Approach 1:
The patent implements a feedback control system where the attack angle is continuously measured by a sensor and compared to a reference value. The control device automatically adjusts the screed assembly position based on the measured deviation, creating a closed-loop system that maintains constant attack angle despite variations in paving material properties or environmental conditions.
Solution Approach 2:
The patent replaces manual mechanical adjustment of the attack angle with an automated control system. Instead of relying on operators to manually monitor and adjust the attack angle based on visual inspection or experience, the system uses sensors to automatically detect the attack angle and a control device to make real-time adjustments, eliminating human error and inconsistency.
2Adaptability or versatility
If the attack angle is not maintained constant, then the system can adapt to different conditions, but the paving quality deteriorates with unevenness and poor compaction
Solution Approach 1:
The feedback control system continuously monitors the attack angle and automatically adjusts it to maintain the optimal value regardless of changes in paving material properties, installation speed, or environmental conditions. This ensures consistent paving quality while allowing the system to adapt to different operating conditions through automatic regulation rather than manual intervention.
3Ease of operation
If manual monitoring and readjustment of the attack angle is performed, then the attack angle can be controlled, but process reliability decreases due to human error and time consumption
Solution Approach 1:
The system performs self-monitoring and self-adjustment of the attack angle through automated sensors and control devices. The screed assembly automatically detects deviations from the reference attack angle and corrects them without requiring manual intervention, eliminating human error and ensuring consistent, reliable operation throughout the paving process.
Solution Approach 2:
The patent replaces manual visual inspection and mechanical adjustment with automated optical or electronic sensing and hydraulic/pneumatic control. The system uses sensors to detect the attack angle and automatically actuates the adjustment mechanism, eliminating the need for operators to manually monitor and adjust the attack angle, thereby improving reliability and reducing time consumption.
4Area of stationary object
If extension screeds are used without attack angle control, then the paving width is increased, but unevenness in the transverse direction occurs due to different screed heights
Solution Approach 1:
The feedback control system measures the attack angle across the entire screed assembly, including extension parts, and adjusts the positioning to maintain a uniform attack angle from the base screed to the extension parts. This ensures that all sections of the screed operate at the correct angle, preventing transverse unevenness while maintaining the increased paving width provided by the extension screeds.
Data Source
AI summary
The disclosure relates to a road paver comprising a towing vehicle, at least one tow arm, a screed assembly attached to a tow point of the tow vehicle via the at least one tow arm, a leveling cylinder adapted to adjust a position, in particular a height, of the tow point, a screed lifting cylinder adapted to adjust a contact pressure of the screed assembly, a first measuring device adapted to determine a screed height of the screed assembly, a second measuring device adapted to determine an attack angle of the screed assembly, and a feedback control device adapted to control the leveling cylinder and the screed lifting cylinder. The disclosure further relates to a method for feedback controlling a position of a screed assembly and a use of a feedback control device for feedback controlling an attack angle and a screed height of a screed assembly.