Tamper-Proof Electronic Control Unit With Protective Sleeve
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Solution Overview
Problem
Existing electronic control units for security and access systems are vulnerable to unauthorized manipulation and removal, as it is possible to remove the lid and base member without triggering the micro-switches, allowing for potential tampering or removal without detection.
Innovation Solution
The electronic control unit incorporates a protective sleeve that surrounds the actuator and manipulation detecting component, preventing continuous depression of the actuator during removal attempts, ensuring that any unauthorized removal or opening of the lid activates the manipulation detection component, thereby preventing tampering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If micro-switches with actuators are used to detect manipulation, then tamper detection capability is improved, but the system becomes vulnerable to thin objects pressing the actuator continuously during removal
Solution Approach 1:
A protective sleeve is introduced as an intermediary component between the actuator and the external environment. The sleeve surrounds the actuator and is fixed to either the base member or the lid, preventing direct access by thin objects while still allowing the actuator to function normally when pressed from the correct side during legitimate assembly/disassembly operations.
Solution Approach 2:
The protective sleeve provides localized protection specifically around the actuator area, making the system vulnerable to thin object manipulation only in that specific location while leaving other areas unaffected. The sleeve's design allows normal operation from one side while blocking unauthorized access from another side.
2Ease of operation
If the actuator is made accessible for normal operation, then ease of assembly/disassembly is improved, but unauthorized manipulation becomes possible
Solution Approach 1:
The protective sleeve creates an asymmetric protection scheme where the actuator is accessible from one side (allowing normal assembly/disassembly) but protected from the opposite side (preventing unauthorized manipulation). This asymmetric design enables legitimate operations while blocking tampering attempts.
Solution Approach 2:
Instead of making the actuator fully accessible or fully protected, the solution inverts the approach by providing selective access - the protective sleeve allows normal operation from the intended side while blocking access from the opposite side, effectively using the protection mechanism to enable legitimate use while preventing unauthorized use.
Data Source
AI summary
An electronic control unit comprising a base member (10) which is arranged to be fixed to a support surface (3) and a cover or an openable lid (20) which, together with the base member, encloses an interior space, which space accommodates an electronic control circuit. The electronic control circuit comprises at least one manipulation detecting component (41, 42) which is arranged to generate an electric signal when the base member is removed from the support surface or the lid is opened. An actuator (43, 44) is arranged between the manipulation detecting component and the support surface or the lid. A protective sleeve (50, 60) is arranged to be fixed to the support surface or is fixed the lid. The protective sleeve comprises a sleeve portion (52, 62) which is arranged to surround the actuator and at least a portion of the manipulation detecting component when the base member is fixed to the support surface or when the lid is closed respectively.