天然气/柴油双燃料发动机油气切换过程的优化控制  

Optimal control of oil-gas switch processof CNG/diesel dual fuel engine

作　　者：刘震涛[1] 费少梅[1] 

机构地区：[1]浙江大学机械与能源工程学院,浙江杭州310027

出　　处：《浙江大学学报（工学版）》2004年第7期868-871,920,共5页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(50106014).

摘　　要：为避免双燃料发动机在由纯柴油工况向双燃料工况切换过程中出现的转速大幅度波动现象,在对控制系统硬件不作较大改动的前提下,改进软件算法实现油气切换过程的平稳过渡.基于能量守恒方程,建立了油气切换过程的控制模型.在PID子模型中,采用了神经元自适应PID控制模型实现参数的在线自调整.引入了最优控制中的二次型性能指标对神经元的权值进行调整.在试验台中应用此模型对稳定转速工况下(转速为1810r/min,发动机有效功率为其额定功率的25%)的油气切换过程进行控制,结果显示切换过程中的转速波动率小于1.6%,实现了油气切换过程的平稳过渡,提高了整机性能.In order to eliminate the speed fluctuation of the compressed natural gas (CNG)/diesel dual fuel engine in the switch process from pure oil condition to dual fuel condition, the software algorithm was improved to realize the smooth transition with little change on the control system hardware. Based on the energy conversation formula, the control model of the oil/gas switch process was built. A self-adapted PID control model based on neural cell was developed to adjust the PID parameters online, and the quadratic index of optimal control was introduced to adjust the weights of neural cell. By using the proposed model to control the oil/gas switching process under the steady condition in which the engine speed was 1810 r/min and the engine effective power was 25% of the full load, the results showed that the maximal speed fluctuation was less than 1.6%, the smooth transition was achieved, and the engine performance was improved.

关 键 词：双燃料发动机 油气切换 自适应控制模型 

分 类 号：U461.8[机械工程—车辆工程]