在vc环境下实现温度、液位等参数控制的PID程序，程序中实现了增量式PID控制算法，设定值或参据量可以通过一个函数获取。-in vc environment temperature, liquid level parameters such as PID control procedures, process to achieve the incremental PID control algorithm, the set value or volume parameters according to a function can be obtained.