Three-Way Heating Shell With In-Situ Resistive Circuits
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Solution Overview
Problem
Existing fluid circuits in motor vehicles, such as those in internal combustion engines and SCR pollution control systems, face issues with freezing and blockages due to unheated fluids, leading to potential engine damage and malfunction, particularly in cold weather.
Innovation Solution
A heating shell with integrated resistive heating circuits is designed for three-way connectors, allowing for direct heating within the shell rather than the fluidic connector, providing thermal protection and insulation, and can be manufactured using techniques like selective metallization and bi-material injection, with a dielectric coating for sealing and protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heating means are integrated into the fluidic connector, then the connector can be heated directly, but the complexity of the connector increases and modification of the existing circuit is required
Solution Approach 1:
The heating function is segmented from the fluidic connector and placed in a separate shell. The shell and connector are distinct components that can be assembled together, allowing the connector to remain simple while the shell provides heating capability.
Solution Approach 2:
The shell acts as an intermediary component between the power source and the fluidic connector. It houses the heating circuits and provides thermal energy to the connector without requiring the connector itself to contain heating elements.
2Reliability
If heating circuits are formed on semi-cylindrical surfaces of the shell, then the shell can provide effective thermal protection, but the manufacturing process becomes more complex
Solution Approach 1:
Traditional wiring and heating element installation is replaced by forming resistive tracks directly on the semi-cylindrical surfaces of the shell. This can be achieved through printing or selective metallization processes, simplifying the manufacturing compared to assembling separate heating components.
Solution Approach 2:
The manufacturing process transitions from mechanical assembly to surface-based formation of heating circuits. The resistive tracks are created by changing the surface properties of the shell through printing or metallization, allowing integration of heating function without complex mechanical structures.
3Reliability
If the shell is made of plastic or composite material, then the shell can provide insulation and mechanical protection, but the shell cannot conduct heat efficiently
Solution Approach 1:
The shell has different thermal properties in different locations. The bulk material (plastic or composite) provides insulation and mechanical protection, while the heating circuits formed on the surface provide localized heat generation where needed, creating a gradient of thermal functionality.
Solution Approach 2:
The shell uses composite construction combining plastic or composite material for structural and insulating properties with resistive heating circuits for thermal management. This composite approach allows the shell to simultaneously provide insulation, mechanical protection, and controlled heating capability.
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 solution effectively prevents fluid freezing and blockages, ensuring the operational integrity of motor vehicle fluid circuits by providing controlled thermal power between 0.5 and 10 W, enhancing the reliability and durability of the fluid circuit components.
Implementation Method 1
it comprises resistive heating circuits which are formed in situ on said semi-cylindrical surfaces
Data Source
AI summary
Three-way heating shell, in particular for a motor vehicle fluid circuit, said shell being generally T-shaped or Y-shaped and comprising an inner passage having the same shape, in which passage a three-way fluid connection is intended to be housed, the shell being formed by two half-shells (10a) having the same shape which are attached to one another and together define the passage, the half-shells comprising semi-cylindrical surfaces (22, 24, 26) forming portions of the passage, the heating shell being characterised in that it comprises resistive heating circuits (28a, 28b) which are formed in situ on the semi-cylindrical surfaces.