Dissimilar Dual-Channel Position Control for Hybrid Aircraft Thrust
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Solution Overview
Problem
Current control systems for hybrid rotary-wing aircraft, particularly those with additional thrust, face challenges in rapidly adjusting power or finely controlling forward speed, and are prone to malfunctions that can lead to unsafe operations, such as untimely changes in thrust or propeller pitch during critical phases like autorotation.
Innovation Solution
An electrical control device with independent and dissimilar measurement systems for position detection, a processing unit that compares these measurements to generate a control signal, and a return system to maintain the control in a neutral position, ensuring reliability and safety by preventing untimely rotations or thrust changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single measurement system is used to control additional thrust, then the device complexity is reduced, but the reliability deteriorates due to potential malfunctions and unsafe operations
Solution Approach 1:
The patent applies local quality by making the two measurement systems dissimilar rather than identical. Each system uses different measurement principles (e.g., optical encoder vs. magnetic sensor), allowing them to independently measure the same physical quantity through different physical mechanisms. This dissimilarity ensures that a malfunction in one system does not correlate with the other, thereby improving reliability while maintaining manageable complexity through targeted differentiation rather than comprehensive redundancy.
2Ease of operation
If an on/off thrust control is used, then the ease of operation is improved, but the manufacturing precision deteriorates because the pitch change is too slow for quick power adjustment or too fast for fine speed control
Solution Approach 1:
The patent transforms the static on/off control into a dynamic system by introducing a return system with controlled movement characteristics. The operating means can be rapidly moved between positions, and the return system provides controlled motion with damping or friction elements that enable precise positioning. This dynamic approach allows the same control mechanism to achieve both rapid response when needed and fine precision control during positioning, resolving the contradiction between operational simplicity and control precision.
3Ease of operation
If the operating means is allowed to rotate freely, then the ease of operation is improved, but the reliability deteriorates due to untimely rotations during critical phases like autorotation
Solution Approach 1:
The patent segments the control system into two independent but complementary subsystems: a mechanical return system that provides passive stability and prevents untimely rotations, and an active control system that allows intentional movement when needed. The return system divides the control mechanism into a movable operating means and a fixed reference position, with the return mechanism acting as an independent safety layer. This segmentation allows the system to simultaneously provide ease of operation through free movement capability and reliability through passive position stabilization.
Data Source
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AI summary
The present invention relates to an electrical control device (1) equipped with an operating means (3). The electrical control device (1) comprises a first measuring system (10) and a second measuring system (20) which respectively perform a first measurement and a second measurement of the current position of the operating means (3). A processing unit compares the first measurement and the second measurement to generate a control signal (ORD) based on said current position, said processing unit (30) considering the operating means (3) to be in a neutral position when the first and second measurements do not correspond to the same position of the operating means.