Power Converter Thermal Utilization in Aircraft Engine Start Systems
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Solution Overview
Problem
Current engine start systems for aircraft do not accurately track power converter utilization, leading to unnecessary long wait periods and potential thermal damage due to fixed maximum start duty cycles that do not account for actual power converter usage.
Innovation Solution
A method using empirically derived mathematical models of power converter thermal characteristics, combined with measured operation data, to calculate dynamic operation parameters for optimal power converter utilization and detect duty cycle abuse, reducing wait periods and preventing thermal overload.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed maximum start duty cycle is used to protect the power converter, then thermal damage is prevented, but unnecessary long wait periods occur due to inaccurate tracking of actual utilization
Solution Approach 1:
The patent applies dynamics by transitioning from a fixed, static duty cycle limit to a dynamic, adaptive duty cycle calculation. The system continuously monitors actual power converter utilization and adjusts the maximum start duty cycle parameters in real-time based on thermal characteristics and current operating conditions, allowing the protection mechanism to adapt to actual usage patterns rather than enforcing a rigid predetermined limit.
Solution Approach 2:
The patent implements feedback by establishing a closed-loop system that monitors actual power converter utilization, compares it against thermal characteristics, and adjusts the maximum start duty cycle accordingly. The system uses feedback from temperature sensors and operation counters to dynamically recalculate safe operating parameters, ensuring continuous alignment between protection limits and actual thermal state.
2Reliability
If the maximum start duty cycle is reduced to prevent duty cycle abuse, then power converter rating is protected, but operational flexibility is reduced
Solution Approach 1:
The system dynamically adjusts the maximum start duty cycle parameters based on actual power converter utilization rather than enforcing a fixed conservative limit. By continuously monitoring operation time and comparing against thermal characteristics, the system can allow higher utilization when actual usage is low while maintaining strict limits when utilization approaches thermal boundaries, thereby preserving operational flexibility while ensuring protection.
Solution Approach 2:
The patent changes the parameter of maximum start duty cycle from a fixed value to a dynamically calculated value based on thermal characteristics and actual utilization. The system rec calculates safe operation time limits and wait periods based on current thermal state, allowing the operational parameters to change adaptively rather than remaining static, thus maintaining both protection and flexibility.
3Productivity
If continuous monitoring and dynamic calculation of power converter utilization is implemented, then optimal utilization is achieved, but system complexity increases
Solution Approach 1:
The patent applies universality by using the existing engine start system controller to perform multiple functions: it continues to manage the basic start operation while also monitoring power converter utilization, calculating thermal characteristics, and adjusting duty cycle parameters. Rather than adding a separate dedicated monitoring system, the existing controller is made multi-functional, thereby achieving optimal utilization without proportionally increasing system complexity.
Solution Approach 2:
The system implements self-service by having the power converter utilization monitoring and duty cycle adjustment performed automatically by the existing control system without requiring external intervention or complex additional hardware. The controller autonomously tracks operation time, calculates utilization based on stored thermal characteristics, and adjusts parameters dynamically, making the system self-regulating and minimizing the complexity burden of the monitoring function.
Data Source
AI summary
A method and system for utilization of power converters in an aircraft engine start system includes measurement of power converter operation data that is utilized with a mathematical model of the power converter thermal characteristics to calculate operation limits for subsequent start duty cycles. A warning indicator is utilized in the event the start duty cycle limits are exceeded. This invention can be extended for any More Electric Vehicle applications, which utilizes an electric engine start system.