作者的回复2.3节中的图1-6和表1-3表明，PID的控制性能能够使液

The author’s reply Figure 1-6 and Table 1-3 in Section 2.3 show that the PID control performance can make the liquid level move along the reference trajectory when the liquid level is in the middle liquid level, but its control effect is at the high or low liquid level. Very unsatisfactory.

Figures 1-6 and Table 1-3 in section 2.3 of the author's response show that the control performance of PID can make the level move along the reference trajectory at the medium level, but its control effect is very unsatisfactory at the high or low level.

Figure 1-6 and table 1-3 in Section 2.3 of the author's reply show that the control performance of PID can make the liquid level move along the reference trajectory at medium liquid level, but its control effect is not ideal at high or low liquid level.<br>