Research On Intelligent Pid Control Theory And Technique Of Digital Electronic Governing System Of Locmotive Diesel Enging

Based on the present situation of diesel locomotives industry in our country, utilizing micro-electronics technique i.e. replacing the mechanical-hydraulic governor being used with digital electronic governor without changing the fuel supply system is a short-cut to improve the technique, product grade and the using of our diesel locomotives and will help to attain our continuous goal of 揾eavy-load, speed-raising?in diesel locomotives, which has significant meaning in the development of the railway industry in our country. During the course of design, research and debugging of governor system, the author made deep and thorough research on relevant theories and techniques and succeeded in inventing the digital electronic governor system of high-power, medium-speed diesel. It抯 the first time in our country that digital control is applied to diesel speed. And to some degree it enriches and develops the theories and techniques of diesel electronic control.To take into account the particularity of diesel in the operating process and satisfy the practical need of diesel speed control, the article defines the crankshaa angle domain and corresponding angle frequency domain, which is helpful in deciding the control cycle and processing the speed control signal. On the basis of the definition of smooth curve in the computer aided graph design(CAGD)and with cylinder抯 maximum explosion pressure as the control point, the author imitates cylinder pressure fluctuation waveform with Luonuns function and sets up the diesel dynamic models which basically reflect diesel transient dynamic and digital control characteristics.Using speed and injection pump rack displacement and double closed loop P~ control program, The author invents the locomotives diesel digital electronic governor system based on SOC 196KC single-clip microprocessor. With the intelligent advantages of computer control system, the author puts forward a startup operating scheme with the combination of open-loop and closed-loop. It can provide the best start-up fuel supply according to the diesel need, which can make the start-up process fast, smooth and without overgoverning. Furthermore, based on this, the author also produces a method of online automatic tune P11) controller parameter initial value.Directed against the limitation conventional P1]) controller and with the already P1]) controller parameter initial value as a basis. The author develops a neuron networks intelligent P11) controller used in idle control and a asynchronous learning method whose learning cycle can be changed in order to meet the need of different control speed fluctuation. Besides, directed against sudden load change operating mode, the author puts forward a gain controlling P1]) control algorithm to adjust gain with acceleration as a special measure.For convenience of online experiment and to analyze control algorithm effectively, the author develops diesel electronic governor real-time monitoring/testing system and realizes the parallel communication program between single-clip microprocessor and PC with dual-port RAM IDT7 132 and PC printing interface as the basis, which has a widespread reference value.The author develops the diesel digital electronic governor hardware-in-loop simulation system based on the testing system hardware. Besides, the author has made a great number of bench experiments including start-up, unload stability, speed-adjusting and sudden load change etc. Which indicate good behavior of this governor system.