LNG/柴油双燃料柴油机控制软件模块化设计

针对船用LNG/柴油双燃料发动机,采用模块化设计理念,开发一套双燃料柴油机的控制软件。根据双燃料柴油机工作特性,在Matlab/Simulink环境下搭建控制算法,完成信号输入模块、转速计算模块和控制系统模块设计,其中控制系统模块核心包括发动机状态判断模块、自学习模块、稳态判断模块,通过软件滤波和自学习算法保证发动机控制的稳定性。台架试验结果表明:控制软件运行正常,发动机稳定运行,发动机经济性和排放性显著提高,在发动机转速为1 200 r/min时,NO_x排放最大降低63.5%,烟度降低70.0%,但CO和HC排放升高。此外,研究还表明,应用Matlab/Simulink模块化的电控软件开发方法具有开发周期缩短、开发成本降低及软件维护方便的优点。

Modular Design of Control Software for LNG / Diesel Dual Fuel Diesel Engine

For the marine LNG/diesel dual fuel engine, using modular design concept, a control software is developed. According to the working characteristics of the dual fuel engine, the control algorithm is established in the Matlab/Simulink environment and the design of signal-input module, the speed-calculation module and the control-system module are completed. The core of the control-system module includes the engine state judgment module, the self-learning module and the steady state judgment module. The stability of the engine control is realized through software filtering and self-learning algorithm. The results of the bench test show that the control software can run normally and steady, the engine economy and the discharge are significantly improved. At the rotational speed of 1 200 r/min, the NOX emission is reduced by 63.5% and the smoke rate is 70.0%, but the CO and HC emissions elevated. With the modular-development method, the time is shortened, the cost is reduced and the software is easy to maintain.