Electronic Governor Overvoltage Protection for Aircraft
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Solution Overview
Problem
Existing aerial vehicle electronic governors face damage due to overvoltage issues during large-action flights, as the output is cut off, potentially causing crashes, due to the inability to effectively manage DC bus voltage fluctuations.
Innovation Solution
An overvoltage protection method and device for electronic governors in aerial vehicles, which adjusts control parameters based on DC bus voltage thresholds using PI control algorithms and superimposition processing to restrain voltage rises, ensuring safe operation within voltage limits by controlling motor speed and output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the output of the electronic governor is cut off when DC bus voltage exceeds a preset value, then overvoltage damage is prevented, but the aerial vehicle may crash during large-action flights due to excessive voltage fluctuation management
Solution Approach 1:
The patent applies preliminary action by adjusting the control parameter before the DC bus voltage reaches the dangerous threshold. When the voltage enters the first threshold range (below the second threshold), the system proactively modifies the control parameter to prevent further voltage rise, rather than waiting for overvoltage to occur and then cutting off output.
Solution Approach 2:
The patent implements dynamics by making the control parameter adjustable rather than fixed. The control parameter is modified based on the real-time DC bus voltage level, allowing the electronic governor to adapt its control strategy dynamically to prevent overvoltage during large-action flights while maintaining normal operation during steady-state conditions.
2Reliability
If the control parameter is adjusted based on DC bus voltage difference, then further voltage rise is restrained, but control precision is required to avoid excessive parameter modification
Solution Approach 1:
The patent applies feedback by continuously monitoring the DC bus voltage and using the voltage difference (actual voltage minus first threshold value) to determine the extent of control parameter adjustment. This closed-loop feedback mechanism ensures that the control parameter modification is proportional to the voltage deviation, preventing both under-correction and over-correction.
Solution Approach 2:
The patent implements parameter changes by modifying the control parameter based on the DC bus voltage difference. The control parameter is adjusted by an amount proportional to the voltage deviation, allowing the system to respond to voltage fluctuations with appropriate control adjustments while maintaining stability through controlled parameter variation.
Data Source
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AI summary
An aircraft, and over-voltage protection method and device for an electronic governor thereof. An electronic governor is used to control a motor. The method comprises the following steps: acquiring a direct current busbar voltage of an electronic governor (S1); if the direct current busbar voltage is greater than a first voltage threshold and less than or equal to a second voltage threshold, then adjusting, according to a difference between the direct current busbar voltage and the first voltage threshold, a control parameter of the electronic governor, such that the electronic governor controls, according to the adjusted control parameter, a motor to suppress a further increase of the direct current busbar voltage (S2), wherein the second voltage threshold is greater than the first voltage threshold; and if the direct current busbar voltage is greater than the second voltage threshold, then controlling the electronic governor to terminate an output, such that the electronic governor controls the motor to stop running (S3). In this way, the present invention enables suppression of energy fed back by a motor and propeller, and prevents the direct current busbar voltage from continuously increasing, thus limiting the busbar voltage within a safe range, and preventing damage to electrical elements.