Adaptive Speed Control of UAV Engine at High Altitude Based on Mode

With the increase in the flight altitude of UAVs, the environmental pressure and temperature gradually decrease, and the change of environmental pressure and temperature will directly affect the air exchange process of the UAV engine, thereby affecting its power output. Aiming at the problem of speed stability control of piston engines for propeller unmanned aerial vehicles, an intake feed-forward model for predicting the influence of environmental change is established to compensate for the air intake in real-time. An adaptive control method of engine speed at high altitude based on model correction and segment strategy is proposed. Based on the Simulink-GT simulation platform, the effectiveness of the established speed control strategy is verified. The results show that under the condition of changing environmental pressure, compared with the control architecture based on MAP feedforward and PID feedback, the maximum speed deviation of the proposed adaptive control of UAV speed based on model correction and piecewise control is reduced by 64.3%, and the average speed error is reduced by 63%, which provides a guarantee for the stable operation of UAV at high altitude.