关键词: 直升机;涡轴发动机;发动机建模;PID控制;扭矩匹配;控制方法

Abstract: For helicopters equipped with multiple engines, the difference in engine working state will seriously affect the transmission system life, so it is necessary to adopt appropriate control method to real-time match the output torque of multiple engines. The current matching method is mostly applicable to the twin-engine configuration, but there is little research on the torque matching method of turboshaft engine under multiple-engine configuration. To solve the problem of multiple matching, a torque matching control method for turboshaft engine under multiple-engine configuration is proposed. Unilateral matching method and bidirectional matching method were designed. A real - time integrated turboshaft engine/rotor model with three engines is established. The results show that the proposed control method can quickly balance the output torque of three engines on the premise of meeting the requirements of rotor power. With the same matching method, the matching time of the high-altitude working point is more than 50% longer than that of the ground. The matching time of bilateral matching of the same working point is more than 50% shorter than that of unilateral matching. The matching time of torque of bilateral matching is significantly shorter, but the droop of power turbine speed is slightly larger. It’s acceptable as the cost of matching speed.