【摘要】 高压共轨喷油器喷嘴流通能力会因积碳或者磨损发生改变，导致喷油流量变化，破坏了柴油机多缸喷油量一致性，影响发动机性能；分析了高压共轨燃油系统喷油器喷油引起的轨压变动过程，在油泵试验台上，采用10 kHz频率采集轨压，并用小波变换处理方法获得轨压特征；理论分析了喷油流量与轨压变动特征的关系，试验发现：喷油器喷油会引起轨压下降，轨压下降速率和喷油流量呈单调正相关，喷油引起的轨压下降总量与喷油量总量也呈正相关，且与多次喷射无关；提出了以保证轨压降相同为目标，通过修正喷油脉宽，实现多缸喷油量一致的控制方法，并对控制方法进行试验验证．更多还原

【Abstract】 Injection flow of high pressure common rail diesel injectors can be affected by carbon deposition or nozzle wear,leading to cylinder-to-cylinder variation of injection quantity and then causing poor engine performance.In this paper,rail pressure variation during the fuel injection was investigated in a high-pressure common-rail diesel fuel system. The rail pressure was collected at a frequency of 10 k Hz on a fuel pump test rig and its variation characteristics were obtained by a wavelet transform processing method. The relationship between the fuel injection flow and the rail pressure variation was determined. The results show that the rail pressure drop occurs during the fuel injection,and the rail pressure drop rate is monotonically positively correlated with the injection flow rate. In addition,the total amount of rail pressure drop caused by the fuel injection is also positively correlated with the total amount of fuel injection. Multiple injection is found to be little effect on rail pressure drop. In order to ensure the same rail pressure drop for multi-cylinder fuel injections,a control method based on modifying the injection pulse width was proposed and the consistency of injection flow rate was verified by experiments.更多还原