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为减轻发动机电磁气门驱动(electromagnetic valveactuation,EVA)的落座冲击,对EVA初始化和过渡过程的前期都用开环控制,运动后期,即当衔铁/气门接近落座位置时采用线性二次调节器(linear quadratic regulator,LQR)法控制落座速度,并对作者研制的EVA建立了数学模型,将其在落座位置附近线性化,编制了控制软件。在EVA实验测试系统上实现了初始化、单次过渡过程控制以及EVA连续动作控制。LQR法的3个状态量是实测的衔铁/气门位移、速度和线圈电流。结果表明,EVA初始化、单次过渡过程以及EVA连续动作的落座速度分别是0.05 m/s、0.06m/s和0.20 m/s。
In order to reduce the seating impact of the electromagnetic valve actuation (EVA), open-loop control is used for the initial stage of EVA initialization and transition. In the late stage of movement, when the armature / valve approaches the seated position, a linear secondary regulator quadratic regulator (LQR) method was used to control the seating speed. A mathematic model was established for the EVA developed by the author, which was linearized near the seated position and the control software was prepared. In the EVA experimental test system to achieve the initialization, a single transition process control and EVA continuous motion control. The three state quantities of the LQR method are the measured armature / valve displacement, velocity and coil current. The results show that the initial speed of EVA, the single transition process and the sequential speed of EVA are 0.05 m / s, 0.06 m / s and 0.20 m / s, respectively.