论文部分内容阅读
为满足新型低温预混合燃烧柴油机燃烧模式切换时的瞬态轨压控制的要求,在结合传统PID控制算法的基础上,提出了一种基于模型的共轨轨压控制结构。通过建立包括轨道、喷油器、高压泵和ECU(engine control unit)驱动特性的共轨系统的前馈物理模型,配合燃油泄漏补偿模块,并应用控制质量评估和切换策略,使得该方法不仅结合了传统PID算法稳定可靠的优点,还具有响应快、不超调以及标定简单等新特点。实验结果表明:该控制算法明显改善了瞬态过程中的轨压控制精度并能保证控制系统在实际应用中安全稳定的要求。目前该算法已应用于中国新一代低温预混合燃烧柴油机产品样机的开发。
In order to meet the requirements of transient rail pressure control when switching the combustion mode of a new low-temperature premixed combustion diesel engine, a model-based common rail pressure control structure is proposed based on the traditional PID control algorithm. By establishing a feedforward physical model of the common rail system including the track, injector, high-pressure pump and ECU (engine control unit) driving characteristics, with the fuel leakage compensation module and applying the control quality assessment and switching strategy, the method not only combines The traditional PID algorithm is stable and reliable advantages, but also has fast response, no overshoot and calibration and other new features. The experimental results show that the proposed control algorithm can significantly improve the accuracy of rail pressure control and ensure the safety and stability of the control system in practical application. At present, the algorithm has been applied to the development of a new generation of low-temperature premixed combustion diesel engine prototype in China.