Gas-Impermeable Cover for Motor Vehicle Control Unit
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Solution Overview
Problem
Control devices in motor vehicles, particularly those in transmissions, face challenges due to exposure to high temperatures, aggressive oils, and corrosive gases, leading to reliability and accuracy issues.
Innovation Solution
A control unit device with a gas-impermeable cover materially connected to a printed circuit board forms a sealed cavity, protecting electronic components and conductor tracks from oils, gases, and chemicals, using welding or soldering with a metal layer, and optionally a sealing coating to prevent chemical degradation and ensure mechanical fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a form-fitting cover with rubber-like seals is used to protect electronic components, then the ease of manufacture and assembly is improved, but the gas tightness and reliability are worsened because gases can diffuse through the seals
Solution Approach 1:
The patent uses a form-fitting cover that is materially connected to the printed circuit board, creating a rigid sealed structure instead of relying on flexible rubber-like seals. This material connection (welding or soldering) eliminates the need for separate sealing elements while achieving complete gas tightness.
2Reliability
If a hermetically sealed housing with soldered cover is used to protect electronic components, then the reliability and gas tightness are improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent combines the cover and printed circuit board into a single integrated structure through material connection (welding or soldering). This merging eliminates the need for separate sealing mechanisms, multi-part housings, and complex assembly steps, achieving hermetic sealing with a simple two-component design.
3Reliability
If additional sealing elements are added to ensure complete gas tightness, then the reliability is improved, but the device complexity and manufacturing steps increase
Solution Approach 1:
The patent extracts and eliminates the need for separate sealing elements (rubber-like seals, gaskets, or additional sealing mechanisms) by directly material-connecting the cover to the printed circuit board. The sealing function is integrated into the structural connection itself, simplifying the device to essentially two components: the printed circuit board and the cover.
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 enhances the service life and accuracy of the control device by preventing chemical reactions and fluid/gas ingress, allowing for reliable operation in harsh environments without the need for additional seals.
Implementation Method 1
A self-contained metallic track is arranged on the side of the printed circuit board on which the components are arranged, the components being arranged in the area enclosed by the track, a cover being connected to the closed track by means of a soldered connection
Implementation Method 2
The cover, which is impermeable to gases and fluids, protects the electronic components of the control unit device from oils, in particular aggressive oils, and also from harmful gases and chemicals
Data Source
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Figure 3~4
AI summary
A control unit device for a motor vehicle includes a circuit board, on which a plurality of electronic components are disposed. The electronic components are electrically coupled to one another by conductor tracks on the circuit board. A substantially gas-impermeable cover is materially joined or bonded to the circuit board in such a way that the cover, together with the circuit board, forms a closed cavity in which the electronic components and the associated conductor tracks are located. A method for producing the control unit device is also provided.