Therefore, the control structure shown in Fig. 1, which is known as a PI-PD control structure, has been proposed. In this structure, G(s) is the plant transfer function因此，提出控制結構，稱為 PI-PD 控制結構的圖 1 所示。 在這種結構 G(s) 是植物傳遞函數
and GPI(s) and GPD(s) are the PI and PD controller transfer functions, respectively, which have the following ideal forms: 與 GPI(s) 和 GPD(s) PI 和 PD 控制器傳輸功能，分別是，哪有以下的理想形式：
This structure, which uses an inner feedback loop, is not a totally new concept. Benouarets [11] was the first to mention the PI-PD controller structure. Unfortunately, its true potential was not recognized there as it was used to control plants with simple stable real pole transfer functions where its advantages are relatively minor. Later, Kwak et al. [6] and Park et al. [2] used a PID-P control structure for controlling integrating and unstable processes, respectively. However, as they still use the derivative term, D, in the forward path, the structure這種結構，使用壹個內反饋循環，不是壹種全新的概念。 Benouarets [11] 率先提 PI-PD 控制器結構。 不幸的是，它的真正潛力未被識別存在，它用來控制植物與真正的簡單穩定桿傳遞函數，其優點是相對較小。 稍後，郭 et al.[6] 和 [2] 公園 et al.，分別控制集成和不穩定的進程使用-P PID 控制結構。 但是，作為他們仍使用該結構正向的路徑中的衍生金融工具的術語 D，
may result in a derivative kick. Also, they use a gain only controller to alter the open-loop unstable or integrating processes to open-loop stable processes and then可能會導致衍生的踢。 他們還，改變開環穩定進程的開環不穩定或集成過程使用增益唯壹控制器，然後
use the PID controller for an effective control of the overall system. It is better to use an inner feedback loop with a PD controller rather than a P-only controller, as this not only converts the open-loop unstable or integrating processes to open-loop stable processes but also guarantees more suitable pole locations. To clarify this better, consider the PD controller of the form given by
Eq. 2 and a general plant transfer function of 使用壹個有效的控制整個系統的 PID 控制器。 最好 PD 控制器，而不是壹個只 P 的控制器使用壹個內反饋循環，因為這不僅能將開環不穩定或集成流程轉換為開環穩定進程，也保證了更適合桿位置。 若要更好地闡明這，考慮給予式 2 和壹個總廠傳遞函數的窗體的 PD 控制器The closed-loop transfer function for the inner loop, 在內部的循環的閉環傳遞函數
with G(s) given by Eq. 3, is獲式 3 G(s)，是
provided that n>m+2. The modification in the last two erms of the denominator of Eq. 4, due to the insertion f the PD controller used in the feedback loop, is clear. 提供該 n > m + 2。 由於到使用反饋及時插入 f 規劃署控制器的式 4，分母的最後兩個條款的修改是清晰
Let us assume that the coefficients a0 and a1 take suitable alues to make the plant transfer function given in Eq. 3 unstable, integrating or a resonant plant transfer讓我們假定您與系數 a0 a1 采取適當 alues 進行傳遞函數方程 3 不穩定，集成中給出的植物或***振的植物傳輸
function. The PD controller used in the inner feedback loop can be used to convert it to an open-loop stable plant transfer function for the PI controller used in the函數。 內反饋循環中使用的 PD 控制器可用來將其轉換為壹個開環穩定植物傳遞函數中使用的 PI 控制器，
forward loop, which can then be used for a more satisfactory closed-loop performance. Another point, which should be pointed out, is that the use of the PI-PD controller gives more flexibility than a PID-P controller to locate the poles of open-loop plant transfer function Gil(s) in more desired locations, with the simultaneous轉發，然後可用於更令人滿意的閉環性能的循環。 應該指出，另壹點是 PI-PD 控制器的使用提供更大的靈活性，比在更多所需的位置，同時與找到的開環植物傳遞函數 Gil(s) 桿將-P PID 控制器
use of Kf and Td rather than a gain-only parameter Kf. 使用的 Kf 和 Td 而不是只增益參數 Kf
呵呵，在線翻譯的。