（1）位置式PID控制的输出与整个过去的状态有关，用到了误差的累加值；而增量式PID的输出只与当前拍和前两拍的误差有关，因此位置式PID控制的累积误差相对更大；

（2）增量式PID控制输出的是控制量增量，并无积分作用，因此该方法适用于执行机构带积分部件的对象，如步进电机等，而位置式PID适用于执行机构不带积分部件的对象，如电液伺服阀。

（3）由于增量式PID输出的是控制量增量，如果计算机出现故障，误动作影响较小，而执行机构本身有记忆功能，可仍保持原位，不会严重影响系统的工作，而位置式的输出直接对应对象的输出，因此对系统影响较大。-(1) Position PID control output and the entire state of the past, used the accumulated value of the error　incremental PID output only error with the current beat and shot the first two, and therefore the position of the cumulative error PID control relatively greater　(2) incremental PID control is to control the amount of incremental output, there is no integral action, so this method is suitable for the implementation of the object body with integral components, such as stepper motors, etc., and positional PID applicable Object actuators without integral components, such as electro-hydraulic servo valve. (3) Since the incremental PID control output increment, if the computer failure, malfunction less affected, while executing agency itself has memory function, can remain in place, will not seriously affect the operation of the system, and positional output directly corresponds to the output object, so a greater impact on the system.