中文摘要：

为提高FAI（Free Armature Injection,自由电枢喷射）电控燃油喷射系统的精度,需探求电喷单元实际喷 油量与喷射脉宽之间的关系.根据容积法的检测原理搭建了电控喷油器智能检测平台,通过测量在恒压状态 下喷射一定容积的燃油所消耗的时间来获得喷油器的单次喷射量.采用LabVIEW软件设计了上位机软件, 使用FAI喷油器在该检测系统上进行流量特性测试,找出流量特性曲线的线性阶段,并进行不同驱动电压下 的流量特性测试,为喷油器电压波动的补偿提供参考.试验结果显示,该 FAI喷油器在喷油脉宽4 400 - 6 800μ s内呈良好的线性关系;随着驱动电压的增大,电喷单元无效喷射时间减小,线性阶段曲线斜率变化不 大,分别为：2.64、 2.67、 2 .63、 2 .65、 2 .65、 2. 8 0 ,表明针阀完全打开后喷射量受驱动电压波动的影响不大.

英文摘要：

To improve the accuracy of electronic-controlled injection system, the detection system was built up for electronic-controlled injection pump. Firstly,it was based on volume method,measuring the time consumed by injecting a certain volume of fuel at a constant pressure to obtain the single injection amount of the injector. Secondly,the system developed with LabVIEW software had manual and automatic detection models. Finally,the FAI injector was used to test the flow characteristics in the detection system to find out the linear phase of the flow characteristic curve and the flow characteristics detection was completed under the different driving voltages, which could provide reference for the compensation of the voltage fluctuation of the injector. The result showed that a good liner relationship was found in the injection pulse width in the range of 4 400 μs to 6 800 μ s.In this range, the injection quantity can be controlled precisely by electronic control unit. In addition, with the increase of the driving voltage, the injection time was reduced and the slope of the curve in the linear phase was basically u n c hanged, respectively： 2. 64, 2. 67, 2. 63, 2. 65 , 2. 65, 2. 80. This means that after the needle valve fully o p e n e d, the injection quantity is basically unaffected by the fluctuation of the driving voltage.