公开(公告)号：US5726880A

公开(公告)日：1998-03-10

申请号：US642403

申请日：1996-05-03

Applicant: Graham Bailey ,  Helmut Heger

Inventor： Graham Bailey ,  Helmut Heger

IPC: F25B49/04 ,  G05B13/02 ,  G05D23/19

CPC classification number: G05B13/024 ,  F25B49/04 ,  G05B13/0275 ,  Y10S706/90

Abstract: The present invention relates to a method of controlling an output variable of a process having long dead times and delay times, for example for controlling the interior temperature of an absorber refrigerator, and also relates to an apparatus for carrying out such a method. The output variable of the process, such as the interior temperature, is sampled and compared with a desired value in order to determine a desired value deviation. In dependence on the determined desired value deviation, a manipulated variable, such as the power supplied to the absorber, is calculated in such a manner that the output variable of the process is brought near to the desired value. After the lapse of a waiting time, a value of the manipulated variable is newly determined. During the waiting time, the manipulated variable is not altered. The waiting time is calculated on the basis of the difference between the value of the manipulated variable and an earlier value of the manipulated variable. A controller for carrying out the method comprises a memory for an earlier calculated manipulated variable and a timer which is designed to receive the earlier calculated value of the manipulated variable and the current value of the manipulated variable, to calculate a waiting time from these and, after the lapse of this waiting time, to start a new calculation of a value for the manipulated variable.

Abstract translation: 本发明涉及一种控制具有长死区时间和延迟时间的方法的输出变量的方法，例如用于控制吸收式制冷机的内部温度，并且还涉及一种用于执行这种方法的装置。 该过程的输出变量，例如内部温度，被采样并与期望值进行比较，以便确定期望的值偏差。 根据确定的期望值偏差，以使得过程的输出变量接近期望值的方式来计算诸如提供给吸收器的功率的操纵变量。 经过等待时间后，新确定操纵变量的值。 在等待时间内，操作变量不变。 基于操作变量的值和操作变量的较早值之间的差来计算等待时间。 用于执行该方法的控制器包括用于较早计算的操作变量的存储器和被设计为接收操纵变量的较早计算值和操纵变量的当前值的定时器，以计算从这些操作变量的等待时间， 在等待时间过去之后，开始对操纵变量的值进行新的计算。