Road Paver Screed Heating Element Control
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Solution Overview
Problem
Existing road paver heating systems are inefficient in utilizing generator power and adapting to different screed configurations, leading to suboptimal heating performance and increased energy consumption.
Innovation Solution
A road paver with a control device that individually switches electric resistance wire windings based on screed configuration, allowing for modular and adaptable heating power distribution, including the use of Power Line Communication (PLC) for efficient signal transmission and automatic configuration recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If heating elements are operated in a clocked manner to limit power input, then energy consumption is reduced, but heating homogeneity deteriorates
Solution Approach 1:
The heating element is divided into multiple independent heating zones (first heating zone, second heating zone, third heating zone) that can be controlled separately. This segmentation allows selective activation of specific zones based on screed configuration and thermal requirements, enabling energy reduction by activating only necessary zones while maintaining heating homogeneity through targeted temperature control in each segment.
Solution Approach 2:
Different heating zones are assigned different control strategies based on local requirements. The control device independently regulates each heating zone according to temperature sensor feedback from corresponding areas, allowing localized temperature optimization. This ensures homogeneous overall heating while enabling energy savings by adjusting or deactivating specific zones when full heating power is not needed.
2Adaptability or versatility
If the generator operates at variable speeds to provide variable electric power, then adaptability to different power demands is improved, but control complexity increases
Solution Approach 1:
Temperature sensors are installed in different heating zones to detect local temperatures and provide feedback to the control device. The control device uses this feedback information to automatically adjust generator speed and selectively activate heating zones, achieving adaptive power control without requiring complex manual intervention. The feedback loop simplifies the control strategy by using sensor data to automatically determine optimal heating configurations.
Solution Approach 2:
The system dynamically adjusts generator operating speed and heating zone activation based on real-time thermal conditions and screed configuration. Rather than fixed-speed operation with manual switching, the system continuously adapts power output to match actual heating demands, achieving high adaptability through automated dynamic control that responds to changing operational conditions.
3Adaptability or versatility
If broadening parts are selectively attached to modify screed size, then versatility of working width is improved, but system complexity increases
Solution Approach 1:
The heating element is designed with multiple heating zones that can serve different screed configurations. The same heating element assembly can accommodate various screed widths by activating appropriate zones, eliminating the need for separate heating elements for each configuration. This universal design reduces system complexity by using a single multi-functional heating component rather than multiple dedicated components.
Solution Approach 2:
The control device is pre-programmed with recognition capabilities for different screed configurations. When broadening parts are attached, the control device automatically detects the configuration and pre-configures the appropriate heating zones for activation. This preliminary programming eliminates the need for manual setup or complex real-time decision-making, simplifying the adaptation process to different screed widths.
4Reliability
If multiple heating spirals are used to provide redundancy, then reliability is improved, but device complexity increases
Solution Approach 1:
The heating element is segmented into multiple independent heating zones with separate control capability. This segmentation provides functional redundancy because if one zone fails or is not needed, other zones can continue operating or be adjusted to compensate. The segmented design achieves reliability through modular independence rather than through duplicating entire heating systems, thereby reducing overall complexity.
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 ensures homogeneous heating, reduces energy losses, and optimizes generator usage, leading to lower operating costs and improved production quality by adapting heating power to specific screed configurations and operational conditions.
Implementation Method 1
at least one electric heating element that may be supplied with power from the generator for heating the compacting units... The heating element is embodied as an electric resistance heating element and comprises at least two resistance wire windings
Data Source
AI summary
A road paver comprises a generator, a control device and a screed, the screed comprising a basic screed and being suited to be modified, by selectively attaching or detaching broadening parts, from a first to at least a second, different screed configuration. The basic screed and the broadening parts each comprise one compacting unit and one electric heating element to be supplied with power from the generator for heating the compacting unit to prevent the laying material from adhering to the compacting unit and to finish a high-quality road pavement. The control device is configured to individually switch on or off each one of the two resistance wire windings of the heating element of the basic screed depending on the screed configuration determined by the control device to distribute electrical power generated by the generator to the individual resistance wire windings.