摘要
介绍了一种基于原机循环油量的柴油机-天然气发动机调节原则,根据此燃料调节原则可以确定引燃柴油和天然气的控制策略:首先将加速踏板位置按照原机油泵油量解释为总油量需求;然后按替代率确定出与总油量需求等热值的两种燃料的量;最后根据标定的数据得到目标油门位置和天然气喷射脉宽。在Matlab/Simulink环境下配置硬件资源,编写带有信号输入/输出、控制参数计算、工作模式确定与切换等完整可靠功能的控制程序,生成可执行文件并下载到MotoTron硬件内,然后在一台潍柴机械泵柴油机改装的双燃料发动机上对控制程序中的MAP进行了标定。最终的验证试验结果表明:按上述循环油量调节方法开发出的双燃料发动机工作稳定,能够实现准确快速的控制;其动力性与原机水平一致,虽然有效效率普遍低于原机,但得益于天然气的低价,其具有诱人的成本优势。
A modulating method based on the cyclic fuel quantity of a diesel engine was introduced for its retrofitted natural gas/diesel engine. According to the method, a strategy of controlling the quantities of pilot diesel and natural gas was determined. First, a pedal position was described as a total fuel demand. Then the cyclic quantities of desired pilot diesel and desired natural gas were calculated from a total fuel demand by means of equivalent heat value and a desired substitution ratio. Finally, a desired accelerograph position and a natural gas injection pulse were obtained according to calibration data. A reliable and fully functional control software was developed with the Matlab/Simulink, which contained such functions as signal input/output, calculation of control parameters, identification and switching of working mode, generation of executable files and download of them into the MotoTron hardware. The calibration of regulation MAPs was carried out on a dual fuel engine retrofitted from a WEICHAI mechanical pump diesel engine. The verification test shows that the dual fuel engine which employs cyclic fuel quantity regulation can work stably and reliably, and can achieve an accurate and fast control while retaining the power of the original engine. Though its brake efficiency is lower, a diesel/gas dual fuel engine is still attractive due to the lower price of natural gas.
出处
《内燃机工程》
EI
CAS
CSCD
北大核心
2017年第5期90-96,共7页
Chinese Internal Combustion Engine Engineering
基金
国家"九七三"重点基础研究发展计划项目(2011CB707200)~~
