Belt drive clutch control system of unmanned helicopter

In light of belt drive clutch control requirements in unmanned modified process of one helicopter, a control system with security features was researched. By analyzing the belt drive clutch manipulation principles and control characteristics, the design requirements of control system were proposed, and then overall design was determined. Rotating speed feedback and intermittent engagement were adopted to realize clutch automatic engagement and avoid excessive decline of engine rotating speed (ERS). Landing signal was collected and hardware cancellation was adopted to avoid responsing dangerous instructions in flight. Rotating speed feedback and magnetor intermittent grounding were used to prevent engine overspeed. Automatic engagement experiment and overspeed experiment were conducted in an unmanned helicopter, and air/ground protection experiment was conducted through simulation. The results show that the minimum ERS is 960 r/min in automatic engagement experiment; the maximum instantaneous ERS is 2016 r/min; the minimum ERS is 1088 r/min, and the overspeed duration is 0.5 s in overspeed experiment; air/ground protection experiment confirms the function of instruction normal execution in ground state and instruction cancellation in air state. These experiments prove that the control system meets the needs of unmanned helicopter.