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A feed forward (sometimes written feedforward) is an element or pathway within a control system that passes a controlling signal from a source in its external environment to a load elsewhere in its external environment. This is often a command signal from an external operator. In a feed-forward system, the control variable adjustment is not error-based. Instead it is based on knowledge about the process in the form of a mathematical model of the process and knowledge about, or measurements of, the process disturbances. These systems could relate to control theory, physiology, or computing.

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  • Feed forward (control) (en)
  • 前馈控制 (zh)
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  • 前馈控制(feed-forward control),是一个术语,描述控制系统中的一个元素或路径,它将控制信号从外部环境的來源传递到另一个外部环境中的负载。这通常是来自外部操作者的命令信号。 仅具有前馈行为的控制系统对其控制信号以预先定义的方式作出响应,不會对负载作出响应;它与同样具有反馈的系统形成对比,反馈系统根据输出如何影响负载,以及负载可能會如何变化来调整输出;负载變化視为系统的外部环境。 在前馈系统中,控制变量的调整不是以目標和回授之間的误差為基礎,它是以过程数学模型的知识和过程扰动的知识或测量为基础。 控制方案需要一些先决条件才能在沒有反馈的情形下,可靠的通过纯前馈來控制:必须可以知道外部命令或控制信号,并且系统输出对负载的影响应该是已知的(这通常意味着负载不會隨时间改变)。有时没有反馈的纯前馈控制称为“弹道”(ballistic),因为一旦发出控制信号,就无法进一步调整;任何纠正调整必须通过新的控制信号。相比之下,“巡航控制”(cruise control)通过反馈机制调整输出以响应其遇到的负载。 前馈系統可能和控制理论、生理学及计算有關。 (zh)
  • A feed forward (sometimes written feedforward) is an element or pathway within a control system that passes a controlling signal from a source in its external environment to a load elsewhere in its external environment. This is often a command signal from an external operator. In a feed-forward system, the control variable adjustment is not error-based. Instead it is based on knowledge about the process in the form of a mathematical model of the process and knowledge about, or measurements of, the process disturbances. These systems could relate to control theory, physiology, or computing. (en)
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