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三、前馈控制系统 1.反馈控制与前馈控制前面我们介绍的各种控制系统都是反馈控制系统,它必须测量被调量,并将测量值与给定值比较,只有出现误差,调节器才产生控制作用,消除干扰对被调量的影响。由于在反馈控制系统中,调节器的控制作用是依据误差产生的,所以又称误差控制。反馈控制的特点是:(1)由于它测量被调量,所以控制的最终结果能使被调量保持在某一给定值上或给定值附近的一个范围内;(2)反馈控制是闭环的,凡包围在闭环内的干扰,调节器都能克服其影响;(3)反馈控制系统只有产生误差后才有调节作用,因此它不可能实现完善的控制,而且调节作用总是落后于干扰作用。
Third, the feedforward control system 1. Feedback control and feedforward control In front of us introduced a variety of control systems are feedback control system, it must be measured and measured, and the measured value is compared with the given value, only the error, adjust Only control the role of the device, to eliminate the impact of the interference on the volume being measured. As in the feedback control system, the regulator’s control is based on the error generated, it is also known as error control. Feedback control has the following features: (1) Since the measurement is measured, the final result of the control can keep the measured value within a given value or a range around the given value. (2) The feedback control is Closed-loop, where surrounded by the closed-loop interference, the regulator can overcome its impact; (3) feedback control system only after the error has a regulatory role, it is impossible to achieve perfect control, and the regulatory role is always lagging behind Interference effect.