Sealed ECU Housing with Balanced Gaskets for PCB Strain Control
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Solution Overview
Problem
The existing ECU housing designs exert undue strain on printed circuit boards (PCBs) due to sealing mechanisms, leading to potential solder bond failures and unreliable operation, as the force required to compress gaskets for sealing can cause deformation and contamination ingress.
Innovation Solution
The ECU housing design features a top and bottom portion with balanced gaskets of equal hardness on opposite sides of the PCB, minimizing strain and using electromagnetic compliance (EMC) gaskets where necessary, along with thermoplastic elastomer (TPE) gaskets in non-shielded areas, to provide effective sealing while reducing mechanical stress on the PCB.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gaskets are used to seal between housing portions and PCB, then sealing effectiveness is improved, but strain on PCB increases
Solution Approach 1:
The patent applies different gasket hardness values at different locations. Softer gaskets are used at corners where localized sealing is needed without excessive force, while harder gaskets are used at edge centers where more sealing force is required. This local differentiation allows effective sealing while distributing strain more evenly across the PCB, preventing concentrated stress points that could cause deformation or solder bond failure.
2Reliability
If sufficient force is applied to compress gaskets, then seal reliability is improved, but PCB deformation increases
Solution Approach 1:
The patent changes the physical parameters of the gaskets by using varying hardness values (Shore A durometer ratings) across different gasket locations. This parameter change allows the sealing system to achieve reliable seals through material property differentiation rather than through uniform high compression force, thereby preventing PCB deformation while maintaining seal integrity.
3Object-affected harmful factors
If gaskets are positioned to ensure complete seal coverage, then contamination protection is improved, but strain distribution on PCB worsens
Solution Approach 1:
The patent implements local quality by positioning gaskets of different hardness values at specific locations around the PCB perimeter. Corner gaskets use softer material for gentle sealing, while edge center gaskets use harder material for robust sealing. This localized differentiation ensures complete contaminant protection while distributing mechanical strain evenly, preventing solder bond failure.
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 design ensures a reliable seal against contaminants while minimizing strain on the PCB, thereby extending the operational life of the ECU by preventing deformation and maintaining reliable electrical connections.
Implementation Method 1
Establishing and maintaining such seals requires that the components to be sealed are secured with sufficient force to compress the gasket between the components
Implementation Method 2
Either or both of the housing portions may comprise an electromagnetic shield, which protects the ECU circuitry from any incoming electromagnetic interference and also blocks any outgoing electromagnetic interference
Data Source
AI summary
An improved ECU for a motor vehicle comprises a housing that includes a top portion and a bottom portion each with an associated gasket. A printed circuit board (PCB) is enclosed between the housing portions. The gaskets provide seals between the housing, portions and respective sides of the PCB and apply balanced forces to each side to minimize strain on the PCB. One or both gaskets may be electromagnetic compliance gaskets.