船用机械燃油系统升级为电控系统的喷射特性及可行性研究

Study on Injection Characteristics and Feasibility of Upgrading Marine Mechanical Fuel System to Electrical Control System

针对旧机改造的潜在市场应用需求,开展船用机械单体泵燃油系统电控化升级的可行性研究。在已标定的机械式燃油系统仿真模型基础上,搭建电控单体泵系统仿真模型并确定电磁阀结构参数,分析电控单体泵系统的喷射稳定性、喷油持续期、喷油率等喷射性能参数及工作范围。分析表明:在满足燃油系统配机需求的情况下,升级后的电控单体泵系统供油正时可覆盖原机械单体泵系统的供油正时;在运行区域内的23个工况点中,电控单体泵系统在15个工况点中的循环油量比原机械系统更稳定。在测试的12个电磁阀中筛选出8套电磁阀,测试得到:其各工况点的控制脉宽最大差异在3000μs内,均在ECU控制参数修正范围内。表明:该方法具有将原机机械式燃油系统升级为电控燃油系统的可行性。

In view of the potential market of retrofitting of old marine diesel engines,the feasibility study of upgrading marine mechanical unit pump fuel systems to electrical control systems was carried out.Based on the calibrated mechanical fuel system simulation model,an electronic-controlled unit pump(EUP)system simulation model was established and the solenoid valve parameters were determined.The injection performance characters,such as injection stability,injection duration,and injection rate,as well as the operating range were analyzed.It shows that with the premise of meeting the matching demand of fuel system,the operating area of EUP systems can cover that of mechanical unit pumps.Among the 23 operating points in the operating area,the fuel injection of the EUP system in the 15 operating points is more stable than the original mechanical system.The 12 solenoid valves were tested and 8 sets of solenoid valves were selected.The maximum difference of control pulse width of each valve at each operating point in the test was within 3 000μs,which was within the correction range of ECU control parameters.It means this method has the feasibility of upgrading the original mechanical fuel system to the electric control fuel system.