1、 柴油机柴油机高压共轨系统高压共轨系统稳态工况稳态工况 油量油量控制策略控制策略研究研究 I 摘 要 随着节能、减排标准的不断提高，对柴油机性能的改善提出了更高要求。高 压共轨电控喷油系统在提高柴油机性能方面具有独特的优势，喷油系统的灵活控 制会直接影响柴油机的性能。油量控制作为共轨系统的关键技术之一，是实现高 压共轨燃油喷射系统灵活控制研究的重要内容。高压共轨柴油机的喷油控制策略 中，在稳态工况时，喷油量控制通常采用闭环控制，能够较好的实现稳定控制， 但仍存在可改善的地方。 本文提出基于模糊 PID 控制的高压共轨系统油量控制策略，根据柴油机的工 况得到目标喷油量，并实现定量喷油，解决高压共
2、轨喷油系统喷稳态工况油量的 控制问题，提高共轨系统在稳态工况的工作性能。工作内容主要包括： （1）根据 柴油机工作过程的数学模型，建立柴油机仿真模型； （2）在柴油机高压共轨电控 燃油喷射系统控制理论分析的基础上，针对柴油机稳定工作状况，比较分析了油 量 PID 和模糊 PID 的控制方法，结合柴油机的特点，采用了模糊 PID 复合的油量 控制策略； （3）使用 MATLAB/Simulink 工具箱，建立油量控制策略模型，与柴油 机模型连接，模拟柴油机稳态工况时加速、减速和定转速工况，进行仿真实验。 结果表明采用模糊 PID 控制，能够达到更好的控制效果，并具有良好的动态响应 性，可以满足工
3、况需求。 关键字关键字：高压共轨；油量控制；模糊控制；PID；仿真 II Abstract With the improvement of energy saving and emission reduction standards, the improvement of the performance of diesel engine is put forward. High pressure common rail electronically controlled fuel injection system has a unique advantage in improving the
4、performance of diesel engine, and the flexible control of fuel injection system will directly affect the performance of the diesel engine. Oil control as one of the key technologies of common rail system is an important part in the research of high pressure common rail fuel injection system. In the
5、control strategy of high pressure common rail diesel engine, the fuel injection quantity control usually adopts close loop control in steady state, which can achieve stable control, but there is still a place to improve. In this paper, the control strategy of high pressure common rail system based o
6、n fuzzy PID control is proposed, According to the diesel engine operating conditions to obtain the target fuel injection quantity, realize the quantitative fuel injection, solve the high pressure common rail injection system spray steady state oil quantity control problem, Improving the working performance of common rail system in steady state. The work mainly includes: (1) according to the mathematical model of the working process of the diesel engine, the diesel engine simulation model is esta
