Road Paver Screed Control Unit for Automatic Width Detection
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Solution Overview
Problem
Conventional road pavers require manual entry of screed width by operators, leading to potential deviations in actual width, affecting heating system efficiency, generator strain, and hydraulic actuation pressures, which can result in suboptimal compaction and increased fuel consumption.
Innovation Solution
A control unit measures electrical operating parameters of the screed's heating device to determine the screed's width, weight, and center of gravity, allowing for precise control of the road paver's operations, including drive speed, material flow, and hydraulic actuation pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the operator manually enters the screed width, then the control system can operate, but the width may deviate from the actual value leading to inefficient heating and increased energy consumption
Solution Approach 1:
The patent replaces the manual mechanical entry method with an automated electrical measurement system. The control unit automatically determines the actual screed width by measuring electrical operating parameters (such as heating power consumption) of the heating device, eliminating the need for manual input and ensuring accurate width detection for optimized energy consumption.
2Ease of manufacture
If the screed width is not accurately known, then manual adjustment is simple, but the heating system cannot reach target temperatures efficiently and generator strain increases
Solution Approach 1:
The control unit continuously monitors the actual screed width through electrical parameter measurements and uses this feedback information to automatically adjust heating power, material flow rate, and generator output. This closed-loop control ensures the heating system operates at optimal efficiency by matching actual screed dimensions, preventing energy waste while maintaining temperature targets.
3Ease of operation
If the center of gravity of the screed is not precisely known, then the hydraulic actuating cylinders can be简单地 adjusted, but the screed experiences asymmetric pressures affecting compaction quality
Solution Approach 1:
The patent replaces simple manual hydraulic adjustment with an automated control system that determines the actual center of gravity position through electrical measurements. The control unit calculates the correct load pressure distribution based on the determined center of gravity and automatically adjusts the hydraulic actuating cylinders accordingly, ensuring symmetric pressure distribution and high-quality compaction without manual intervention.
4Adaptability or versatility
If the screed width is variable and requires manual entry, then the system is adaptable to different widths, but the control parameters must be frequently changed manually
Solution Approach 1:
The control unit automatically detects and determines the actual screed width and center of gravity through electrical parameter measurements, then self-adjusts all control parameters (heating power, material flow, hydraulic pressure) without requiring manual intervention. This self-service capability maintains full adaptability to variable screed configurations while eliminating the need for manual parameter changes, significantly increasing automation level.
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
This solution enables accurate control of the road paver's parameters, optimizing energy use, reducing strain on generators, and ensuring proper compaction by automatically adjusting hydraulic pressures based on real-time measurements.
Implementation Method 1
an electric heating device on the screed and/or if present, on the tamping device
Data Source
AI summary
A road paver is provided with a drive, a bunker, a material conveying device, a screed comprising a tamping device and an electric heating device on the screed and/or on the tamping device, wherein a control unit is configured in such a manner that it determines, by means of a measurable electrical operating parameter of the electrical heating device on the screed and/or on the tamping device, the weight and/or the center of gravity and/or the width of the screed transversely to the working direction of the screed. A method for determining a width and/or a weight and/or a center of gravity of a screed of a road paver, comprising the steps: measuring an electrical variable of a heating device, in particular a heating power, a heating resistance or a power consumption of the heating device; calculating the weight and/or the center of gravity and/or the width of the screed transversely to the working direction of the screed by means of the electrical operating variable.