The Practice Of Control System Based On COM

COM (CoInPonent Object Model) is the kernal technology of Wndowssystem, which has many advantages, such as transparency on process,independency of language, and the capability of distributed comPuting. InControl theory, almost all of the control systems have similar structUre andblock diagram. In this paPer, we use COM technology to decomPose the blockdiagram of control system, and apply COM in control system. Because of theintroduction of COM technology, the implementation of the control system isvery flexible and convenient.The main purpose of this paper is to implement various control algorithInswith the method of COM. In this way, the control algorithIns can be veryconvenient for clients to use. As an example, a component including PID andIMC (Internal Model Control) algorithIns was designed. The main featUre ofIMC is that its feedback is not the response of the controlled system but theerror betWeen the model output and the plan output. On the other hand, theamplitude lAnitation on the control input conunonly exsists in the real controlsystems. These two reasons cause some problems when the IMC algorithIn isdirectly applied to real plants. In this paper, a subsection scheme was taken ina real system. To gUarantee the smooth switching of the control inPut fromother sections to IMC control, some improvement was made on the base of theprhe IMC algorithIn. The new algorithm was successfully allied to an electricheater systCm, and get good performance.