Road Paver Screed Plate Temperature Control via Single Sensor

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Solution Overview

Problem

Existing methods for adjusting the temperature of a screed plate in road pavers are prone to errors due to the need for multiple sensors, which increases complexity and susceptibility to malfunctions.

Innovation Solution

A method that adjusts the temperature of a screed plate using a heating element and a temperature sensor, where the control unit determines the target temperature based on the time profile of the screed plate's temperature, eliminating the need for sensors to measure the material temperature directly.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If multiple sensors are used to measure both material temperature and screed plate temperature independently, then temperature control precision is improved, but device complexity and susceptibility to malfunctions increase

Engineering Contradiction:

Improvetemperature control precisionVSAvoidnumber of sensors

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent combines the temperature measurement function into a single sensor that measures screed plate temperature. The material temperature is no longer measured independently but is inferred from the screed plate temperature measurement, merging two measurement functions into one sensor and reducing system complexity.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The screed plate temperature acts as an intermediary parameter. Instead of directly measuring material temperature, the system uses the screed plate temperature as a mediator to indirectly determine material temperature, reducing the need for direct material temperature sensing.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If multiple independent temperature sensors are provided for material and screed plate, then measurement accuracy is improved, but reliability decreases due to lack of redundancy

Engineering Contradiction:

Improvetemperature measurement accuracyVSAvoidsystem reliability

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

By merging the temperature measurement into a single screed plate temperature sensor, the system creates redundancy in the measurement chain. The same sensor can be used for both controlling screed plate temperature and inferring material temperature, so a single sensor failure does not compromise the entire temperature control system.

Inventive Principle:

Principle #5Merging (Combining)

3Measurement precision

If a sensor for directly measuring material temperature is provided, then temperature control precision is improved, but the number of components and interfaces increases

Engineering Contradiction:

Improvematerial temperature measurement precisionVSAvoidnumber of interfaces

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent extracts the material temperature measurement function from the sensor system. Instead of having a separate sensor for material temperature, the system infers material temperature from screed plate temperature measurements, removing the need for additional sensors and interfaces.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent replaces direct physical measurement (mechanical/physical sensor contact with material) with a thermal field-based indirect measurement. The screed plate temperature field serves as a proxy for material temperature, substituting direct measurement with field-based inference.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 approach reduces the number of components required, decreases the likelihood of errors, and maintains reliable temperature control for the screed plate, preventing material adhesion and ensuring efficient paving operations.

Implementation Method 1

the screed plate (111) and a heating element (113) for heating the screed plate (111)

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 2

a temperature sensor (114) for measuring a temperature of the screed plate (111)

Methodology Applied

Scientific EffectThermal radiation detection: Thermal Radiation

Implementation Method 3

a control unit (130) which, depending on a time profile of the temperature of the screed plate (111), adjusts a target temperature of the heating element (113)

Methodology Applied

Scientific EffectFeedback control: Feedback

Implementation Method 4

due to a heat exchange between the screed plate and the material to be heated by the screed plate

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentUS12281450B2Method for adjusting a temperature of a screed plate of a paving screed of a road paver

Publication Date: 2025.04.22 JOSEPH VOEGELE AG

AI summary

A method is provided for adjusting a temperature of a screed plate of a paving screed of a road paver, wherein the paving screed comprises a heating element for heating the screed plate. The method may include measuring temperature of the screed plate over a time interval using a temperature sensor, and adjusting a target temperature of the heating element, depending on a time profile of the temperature of the screed plate, using a control unit of the road paver.