Multi-Rotor UAV Self-Rescue Using Selective Reverse Thrust
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Solution Overview
Problem
Multi-rotor unmanned aerial vehicles (UAVs) often struggle to take off normally after falling abnormally, especially when they are far away from operators or located in hard-to-reach areas, leading to potential loss due to the difficulty in performing a successful rescue.
Innovation Solution
The UAV system includes at least two rotors capable of providing thrust in both forward and reverse directions, allowing the UAV to assess its attitude and control the rotors to perform a rescue operation by providing reverse thrust to adjust its position and potentially take off from a to-be-rescued attitude.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the multi-rotor UAV falls abnormally and is far from the operator or in hard-to-reach areas, then the difficulty of rescue increases, but the ability to perform rescue operations remains limited
Solution Approach 1:
The patent applies inversion by enabling the UAV to perform rescue operations in inverted or abnormal attitudes. The control system determines that the UAV is in a to-be-rescued attitude and controls rotors to provide reverse thrust, allowing the UAV to rescue itself from inverted positions without requiring manual retrieval, thus dramatically easing rescue difficulty in hard-to-reach areas.
Solution Approach 2:
The patent implements self-service by enabling the UAV to autonomously perform rescue operations. The onboard control system automatically detects abnormal attitudes and executes rotor control to recover from inverted positions, eliminating the need for operator intervention and making the UAV self-rescuable even when far from operators or in inaccessible locations.
2Adaptability or versatility
If the UAV is controlled to perform rescue operation by providing reverse thrust, then the ability to take off from to-be-rescued attitude is improved, but the energy consumption increases
Solution Approach 1:
The patent applies partial action by selectively controlling only the necessary rotors to provide reverse thrust during rescue operations. The control system identifies which rotors need to operate in reverse based on the specific abnormal attitude, rather than requiring all rotors to operate at full power, thus achieving the required adaptability while minimizing energy consumption.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution reduces the difficulty of rescuing the UAV, minimizes the risk of property loss, and enhances user experience by enabling the UAV to adjust its attitude and take off even from large roll angles, thereby preventing loss.
Implementation Method 1
Each of the at least two rotors is configured to provide a first thrust in a first direction when rotating in a forward direction and provide a second thrust in a second direction opposite to the first direction when rotating in a reverse direction
Data Source
AI summary
An unmanned aerial vehicle includes a body, at least two rotors rotatably disposed at the body, and at least one processor. Each rotor is configured to provide a first thrust in a first direction when rotating in a forward direction and a second thrust in a second direction opposite to the first direction when rotating in a reverse direction. The at least one processor is configured to, in response to the body being in a to-be-rescued attitude, determine whether the at least two rotors are capable of conducting rescue, and in response to determining that only one or more first rotors being capable of conducting rescue, control to perform a rescue operation by controlling the one or more first rotors to provide the second thrust and controlling one or more second rotors other than the one or more first rotors to stop rotating.