基于缸压的船用柴油机燃烧闭环控制策略研究

Research on Closed-Loop Combustion Control Strategy of Marine Diesel Engine Based on Pressure in Cylinder

针对柴油机全寿命过程中动力性下降及各缸工作不均匀的问题,以MAN 6L16/24型船用柴油机为研究对象,模拟因各缸喷油器老化而引起柴油机动力性下降和各缸工作不均匀,对比分析开环、转速闭环和燃烧闭环等不同控制策略改善柴油机动力性、工作均匀性的效果及动态控制性能,针对燃烧闭环控制转速滞后较大的问题,提出转速燃烧闭环协同控制策略,分析了该控制策略对轨压波动和进气流道阻塞干扰因素的鲁棒性。仿真结果表明,协同控制策略可有效改善柴油机各缸工作不均匀现象,提升转速响应速度。

To address the issue of power reduction and cylinder-to-cylinder inhomogeneity throughout the entire life cycle of a diesel engine,injector aging was simulated by taking a MAN 6L16/24 marine diesel engine as the research object.The performance improvement in terms of engine power,cylinder-to-cylinder homogeneity and dynamic control was compared with different control strategies of open-loop map,closed-loop speed and closed-loop combustion.Considering the large hysteresis in the speed response of closed-loop combustion control,a cooperative control strategy of the combination of the closed-loop speed control and the closed-loop combustion control was proposed.The robustness of the cooperative control strategy against common-rail pressure fluctuation and intake-port obstruction was simulated and analyzed.It is shown that the proposed cooperative control strategy is effective to reduce cylinder-to-cylinder inhomogeneity and acquire fast speed response.