LTCC Smart Nodes for High-Temperature Engine Control
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Solution Overview
Problem
Current engine control systems for aircraft face challenges in high temperature environments, where conventional electronics fail due to degradation, increased leakage currents, and system failures, necessitating a solution for reliable high-temperature microelectronics and advanced packaging that is cost-effective and durable.
Innovation Solution
The development of Smart Nodes and Data Concentrators assembled on Low Temperature Co-fired Ceramic (LTCC) or composite ceramic substrates, which provide enhanced thermal performance, vibration resistance, and hydration resistance, enabling secure, reliable, and low-cost electronic substrates for distributed engine control systems, allowing for real-time data processing and decision-making near the engine.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional CMOS electronics are used in high temperature environments, then cost and mass production capability are improved, but reliability deteriorates due to increased leakage currents and device degradation above 125°C
Solution Approach 1:
The patent changes the operating temperature parameter range by selecting specific CMOS process technologies (40nm, 28nm, 22nm, 16nm) that maintain reliable operation up to 125°C, and by implementing voltage scaling and power management strategies that adapt to temperature variations, thereby extending the usable temperature range while maintaining mass production benefits
Solution Approach 2:
The patent employs a composite approach by combining CMOS electronics with advanced packaging materials and thermal management structures, including the use of specialized substrates and encapsulants that provide both mechanical support and thermal control, enabling reliable operation in extended temperature ranges
2Device complexity
If smart nodes are placed close to the engine to reduce wiring complexity, then system complexity and wiring weight are reduced, but exposure to high temperatures causes electron mobility degradation and threshold voltage reduction
Solution Approach 1:
The patent changes the operational parameters by implementing dynamic voltage and frequency scaling that adapts to temperature conditions, and by selecting CMOS node sizes and process technologies that maintain acceptable performance margins at elevated temperatures up to 125°C
Solution Approach 2:
The patent introduces intermediate thermal management components and signal conditioning circuits that act as mediators between the high-temperature engine environment and the sensitive CMOS electronics, protecting the devices while enabling close placement to reduce wiring complexity
3Temperature
If silicon carbide components are used for high temperature capability, then temperature tolerance is improved, but cost increases significantly for low volume applications
Solution Approach 1:
The patent changes the temperature capability parameter by utilizing advanced CMOS process technologies (40nm through 16nm) that achieve reliable operation up to 125°C through process optimization and device design, providing a cost-effective alternative to silicon carbide for commercial aerospace applications
Solution Approach 2:
The patent adopts a strategy of using cost-effective CMOS components that can be mass-produced, accepting that individual devices may have limited high-temperature lifetime, but replacing them is economical due to low cost and availability, rather than using expensive long-lived silicon carbide devices
4Adaptability or versatility
If distributed control architecture is implemented, then system flexibility and upgradability are improved, but the burden of heavy wires and wire harnesses increases
Solution Approach 1:
The patent extracts the intelligence from centralized control units and places it directly at the sensor and actuator levels through smart nodes, eliminating the need for complex wiring harnesses by enabling each node to process and communicate data digitally with minimal physical connections
Solution Approach 2:
The patent replaces the mechanical wiring harness system with a digital communication architecture where smart nodes exchange data electronically, substituting heavy physical connections with lightweight digital signal transmission protocols
Data Source
AI summary
A system is provided for interfacing a Full Authority Digital Engine Control (FADEC) system with engine sensors and actuators using miniaturized Low Temperature Co-fired Ceramic (LTCC) substrates operating as smart notes that communicate digitally over a data bus to a miniaturized LTCC operating as a data concentrator. The use of smart nodes and/or data concentrators assembled on LTCC substrates provides enhanced thermal and vibration performance along with resistance to hydration, improved reliability and reduced overall size of the circuitry unit.