Design And Implementation Of Multi-rotor UAV Hybrid Electricity Constant Speed Closed Loop Control System

Due to its simple structure,stable flight,and easy operation,multi-rotor UAVs are widely used in both military and civilian fields.This type of drone is usually driven by pure electric power,but the energy density of the battery is low at this stage.If you need to continue flying,you need to prepare multiple power batteries,which will increase the quality of the battery and correspondingly increase the aircraft ’s quality,in addition to increasing the number of takeoffs and landings,resulting in low efficiency in a single flight,these factors have seriously affected the performance of multi-rotor drones;At the same time,the load change of multi-rotor UAVs is often unpredictable,and the engine speed is a variable that is extremely affected by the load.Therefore,only by designing the speed control system can the overall application performance of the UAV be improved.The above-mentioned problems of unmanned aerial vehicles are designed in this paper.However,the constant speed controller of the current small UAV engine still relies on foreign technology,and the price is relatively expensive.Therefore,in order to improve the performance of the UAV and solve the problem of getting rid of the dependence on foreign technology,the following system was designed.The system is mainly composed of fuel tank,engine,drive shaft,generator,rechargeable battery,rectifier module,constant speed control module,signal acquisition system,liquid crystal display module,etc.,and realizes simple human-computer interaction functions.The constant speed control module is mainly composed of the following parts: STM32 microcontroller,servo control module,speed acquisition,etc.The constant speed control module uses a microcontroller-based feedback control algorithm based on speed.The algorithm processes the signals collected by the speed measurement module and outputs the feedback signal to the steering gear control module,thereby controlling the throttle opening of the engine.Constant speed closed-loop control to achieve speed.This part is mainly used to ensure the constant speed,and then to stabilize the voltage and improve the control performance of the system.The signal acquisition module mainly includes speed measurement,temperature measurement,oil quantity measurement,voltage measurement,current measurement,etc.This part monitors each physical quantity of the system in real time to ensure the safety of the entire system.Will activate the alarm system.Display module and alarm system.This part is mainly used to display each physical quantity for the user to check.When a certain physical quantity has a problem,the system will automatically alarm and prompt the user to respond accordingly;if the oil quantity in the system is too low,the LCD will display Low volume and alarm.Human-computer interaction function.This part mainly implements a simple human-computer interaction function,the user can set the target speed according to actual needs;in addition,the system also includes two working modes: idle speed and normal working mode.Users can choose the corresponding working mode according to their needsThe design of this system improves the performance of the corresponding flight control system while realizing the demand for long battery life,effectively guarantees the constant speed of the generator,thereby ensuring the constant voltage,and is compatible with the foreign GY-701 governor / gyro.It has a larger control range than the system.The system not only reduces manufacturing costs but also sheds dependence on foreign technology.