基于GT-Power和Simulink的柴油机各缸不均匀性闭环控制

Closed-loop Control of Inhomogeneity of Each Cylinder Based on GT-Power and Simulink

为改善柴油机各缸工作的不均匀性,以TBD314V8柴油机为研究对象,将基于缸压计算得到的各缸IMEP和CA50作为反馈变量,将各缸的喷油量和喷油提前角作为控制变量,建立GT-Power与Simulink联合仿真模型。通过模型分析轨压、负荷和喷油提前角对爆压不均匀率、IMEP不均匀率和CA50不均匀率的影响,并对影响因素进行参数灵敏度量化分析,验证闭环控制对改善各缸不均匀性的效果。结果表明:轨压对爆压不均匀率、IMEP不均匀率和CA50不均匀率的影响较小;负荷对IMEP不均匀率的影响最大,且随着负荷的增加线性下降;喷油提前角对爆压不均匀率和CA50不均匀率的影响最大,且CA50不均匀率随着喷油提前角的增大线性增加。经过闭环控制之后,各缸的不均匀性得到明显改善。

In order to improve the working inhomogeneity of each cylinder, the TBD314 V8 diesel engine is taken as the research object. The cylinders IMEP and CA50 are calculated, which based on the cylinder pressure are used as feedback variables. The fuel injection amount and injection advance angle of each cylinder are used as control variables. The joint simulation model of GT-Power and Simulink is established. It analyzes the influence of rail pressure, load and injection advance angle on the explosion pressure, IMEP and CA50 inhomogeneity, and analyzes the sensitivity of the influencing factors, and verifies the closed-loop control on improving the inhomogeneity for each cylinder. The results show that the rail pressure has little effect on the explosion pressure, IMEP and CA50 inhomogeneity. The load has the greatest influence on the IMEP inhomogeneity rate, and decreases linearly with the increase of the load. The injection advance angle has the greatest influence on the explosion pressure inhomogeneity rate and CA50 inhomogeneity rate, and the CA50 inhomogeneity rate increases linearly with the increase of the injection advance angle. After closed-loop control,the inhomogeneity of each cylinder is significantly improved.