The Flow Control And Study On Oil Cooler Heat Transfer Test System

The flow control exists in the course of production extensively. It is worth studying to carry on high-accuracy control of the flow. This paper conducts the engine-oil-cooler's heat transfer test system as the research object. Based on comparatively systematic studies and analyses on the flow control principle, hardware and control strategy, this paper has developed a set of intact flow control system.The article explains the current domestic and international research of the flow control and analyses the existing problems at first. It compares various kinds of present flow control scheme, mainly including control valve and frequency conversion adjust the speed. It analyzes each plus and minus, combines the characteristic of this system and chooses frequency conversion adjust the speed to control the flow. Secondly, it designs the hardware of the oil cooler heat transfer test system and compiles the programs of the flow data collection and communication. Thirdly, it analyzes the flow control course, studies the principle and application of the classical PID control and the fuzzy control. On the basis of analyzes each plus and minus, a kind of fuzzy adaptive PID control is proposed, combining the traditional PID controlling and fuzzy controlling together. It ratiocinates and decides through the fuzzy rule, exactly adjusts three parameters of PID controller online, that is Kp, Ki, and Kd. The simulation shows it enhances the real-time control of the system.Through real operation, the flow control system that is designed makes the good control effect, it could read and control the flow automatically, and run for a long time steadily. It proved that, the control algorithm that chosen has improved the precision of controlling greatly compared with the traditional PID. Comparing with controlling the valve by handwork in the past, this system has improved the experimental precision, shorten the cycle of testing and has reduced workers' labor intensity. The repetitiveness and reproducibility of the experimental data get great improvement.