ECU Memory PCB Layout for Vibration-Resistant Data Access
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Solution Overview
Problem
Existing electronic control units face challenges in high-vibration environments due to the limitations of non-volatile memory devices, particularly in chip package form factor, which are difficult to remove and access, and module form factor, which experiences intermittent electrical connections. There is a need for a solution that provides both vibration resilience and easy data access.
Innovation Solution
An electronic control unit design where the memory device is integrated with a main circuit board and an embedded circuit board, connected by conductive paths, with a predetermined separation line allowing for safe and efficient removal of the memory device for data access, utilizing pads arranged in a pad array along the separation line for connection to standard read-out devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If memory device in chip package form factor is soldered to PCB, then vibration resistance is improved, but ease of access and removal deteriorates
Solution Approach 1:
The circuit board is divided into a first circuit board (main PCB) and a second circuit board (memory carrier), connected by a separable connection structure. This segmentation allows the memory device to remain firmly connected during operation (maintaining vibration resistance) while enabling easy separation for access and removal, thus resolving the contradiction between reliability and ease of operation.
2Ease of operation
If memory device in module form factor uses separable connector, then ease of access is improved, but connection stability in vibration deteriorates
Solution Approach 1:
A second circuit board acts as an intermediary between the memory device and the main PCB. This intermediary provides a stable, rigid connection structure that resists vibration while still allowing easy access through separable connectors, thus resolving the contradiction between ease of access and connection stability.
3Adaptability or versatility
If memory device chip package is removed and resoldered, then data access by different systems is improved, but time consumption and cost increase
Solution Approach 1:
The memory device is mounted on a separate second circuit board that can be easily detached from the main PCB. This segmentation allows the memory device to be accessed and connected to different read-out systems without time-consuming desoldering and resoldering processes, thus resolving the contradiction between adaptability and time consumption.
Solution Approach 2:
The memory device is pre-mounted on the second circuit board with connection structures prepared in advance. This preliminary preparation enables quick connection and disconnection operations when accessing data with different systems, eliminating the need for complex resoldering operations and significantly reducing time and cost.
Data Source
AI summary
An electronic control unit comprises at least one controller and at least one memory device, wherein the controller comprises at least one electronic component mounted on a main circuit board. An embedded circuit board is formed in one piece with the main circuit board, and a predetermined separation line is provided for separating the embedded circuit board from the main circuit board.