ECU Interface Pins With Flexible Input Signal Conditioning
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Solution Overview
Problem
ECU designs face limitations in configurability, adaptability, and flexibility to support multiple applications and features, particularly concerning input/output pins, mechanical package size, and PCB density.
Innovation Solution
A configurable ECU interface with flexible input signal conditioning circuitry that includes a housing, interface pins, a circuit board with conductive traces, and discrete passive components like capacitors and resistors, allowing for selectably configurable configurations to condition either SENT or analog input signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional ECU interface designs are used, then the mechanical package size and PCB density are constrained, but the configurability and adaptability to support multiple applications are limited
Solution Approach 1:
The ECU interface is segmented into modular components: a header portion with interface pins, a circuit board with conductive traces, and selectable discrete passive components. This segmentation allows the same physical package to be configured for different applications by simply changing which components are populated, resolving the contradiction between maintaining a compact mechanical package and achieving high configurability across multiple applications.
Solution Approach 2:
The ECU interface is designed as a universal platform that can support multiple signal types (SENT, analog, and other protocols) and applications through selective component population. The same physical interface structure serves multiple functions by enabling different signal conditioning configurations, thereby achieving adaptability without increasing mechanical package size.
2Adaptability or versatility
If multiple signal conditioning configurations are implemented, then adaptability to different applications improves, but the number of required I/O pins and PCB density increase
Solution Approach 1:
The interface employs dynamic configurability where the signal conditioning path is determined by which discrete passive components are populated on the circuit board. This dynamic approach allows a single set of I/O pins to serve multiple signal types (SENT, analog, etc.) by changing the active circuit configuration through component selection, thereby achieving flexibility without increasing the number of physical I/O pins.
Solution Approach 2:
Different signal conditioning configurations are achieved by changing the electrical parameters of the circuit through selective component population. By varying which passive components (resistors, capacitors, etc.) are installed, the interface can be reconfigured to handle different signal types and protocols, providing adaptability without requiring additional I/O pins or increasing PCB density.
3Adaptability or versatility
If configurable signal conditioning circuitry is added, then compatibility with various applications improves, but the PCB density and manufacturing complexity increase
Solution Approach 1:
The signal conditioning circuitry is segmented into separate discrete passive components rather than being integrated into fixed PCB traces. This allows the same PCB layout to be manufactured once and then configured for different applications by selectively populating components during assembly, thereby achieving high compatibility without increasing PCB density or manufacturing complexity.
Solution Approach 2:
The PCB is pre-configured with all necessary conductive traces and component footprints during manufacturing, but the actual signal conditioning path is determined later by which components are populated. This preliminary preparation of the PCB structure allows for easy reconfiguration across applications without requiring complex PCB designs or high PCB density, as the same manufactured board can serve multiple purposes through selective component installation.
Data Source
AI summary
An electronic control unit includes a housing and an interface extending across the housing including a plurality of interface pins accessible at an exterior of the housing and at an interior of the housing. A circuit board is disposed in the housing. A plurality of conductive traces are operatively coupled with the circuit board and extending between a plurality of discrete component footprints. A microcontroller is positioned on the microcontroller footprint and includes an input pin conductively coupled with a first conductive trace. An input terminal positioned on the input terminal footprint and conductively coupled with a second conductive trace and one of the plurality of interface pins. A flexible input signal conditioning (FISC) circuit comprising a plurality of discrete components positioned on respective discrete component footprints and conductively coupled with respective sets of the plurality of conductive traces.