Road Paver Leveling Cylinder Control for Precise Screed Height
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Solution Overview
Problem
Modern road pavers face challenges in maintaining precise layer thickness and efficiency due to limitations in controlling the screed's angle of attack and material distribution, often requiring manual intervention and indirect measurement methods.
Innovation Solution
A road paver with a height-adjustable chassis and an electronic control system that automatically adjusts the leveling cylinder's towing point height using sensors and a hydraulic control system, allowing for precise control of the screed's angle of attack and material distribution without operator intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the chassis height is manually adjusted to change layer thickness, then material distribution capacity is improved, but layer thickness precision deteriorates due to manual intervention errors
Solution Approach 1:
The patent replaces manual mechanical adjustment of the leveling cylinder with an electronic control system that uses sensors to detect chassis height position and automatically actuates the leveling cylinder to maintain the correct towing point height, thereby eliminating manual intervention errors while preserving material distribution capacity
Solution Approach 2:
The patent implements a feedback control system where sensors continuously monitor the actual towing point height, compare it with the target height, and automatically adjust the leveling cylinder position to correct any deviations, ensuring precise layer thickness control while maintaining optimal material distribution
2Manufacturing precision
If sensors are added to automatically monitor towing point height, then layer thickness precision is improved, but device complexity increases
Solution Approach 1:
The patent implements a self-service control system where the electronic control unit automatically processes sensor signals and actuates the leveling cylinder without operator intervention, reducing the need for complex manual control interfaces and minimizing system complexity while maintaining high precision
Solution Approach 2:
The patent uses an electronic control unit as an intermediary that simplifies the connection between sensors and the leveling cylinder actuator, processing sensor signals and generating appropriate control commands, thereby reducing overall system complexity while enabling precise automatic control
3Device complexity
If the towing point height is not automatically corrected, then device complexity is reduced, but productivity deteriorates due to incorrect layer thickness requiring rework
Solution Approach 1:
The patent applies preliminary action by automatically correcting the towing point height before the paving process begins or during idle periods, ensuring the system is properly calibrated before production starts, thereby preventing incorrect layer thickness without requiring complex real-time intervention during paving operations
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system ensures consistent layer thickness and efficient material distribution by automatically correcting the towing point height, preventing incorrect layer installation and reducing operational complexity and costs.
Implementation Method 1
The control system comprises a receiving unit, an evaluation unit, and a command unit. The receiving unit is configured and interconnected to detect a current actual towing point height.
Implementation Method 2
a correction signal sent by the command unit causing a hydraulic control to adjust at least one of the leveling cylinders
Data Source
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AI summary
A road paver (1) comprising a running gear (19), a chassis (3) height-adjustable relative to the running gear (19), an electronic control system (36), and a screed (7) attached to drawbars (9), wherein the drawbars (9) are each articulated to a drawbar point (15) on the chassis (3), and the drawbar points (15) are each adjustable relative to the chassis (3) by means of a leveling cylinder (11). Height adjustment of the chassis (3) can cause a deviation of the actual drawbar point height (N) from a target drawbar point height.To correct this deviation, the control system (36) includes a receiving unit (37) configured to detect a current actual drawbar height (N), an evaluation unit (39) configured to calculate a deviation of the actual drawbar height (N) from a target drawbar height caused by a height adjustment of the chassis (3) relative to the running gear (19), and a command unit (41) configured to automatically correct the deviation at least partially by sending a correction signal (47) from the command unit (41) to cause a hydraulic control (49) to adjust at least one of the leveling cylinders (11).