电控汽油喷油器动态响应及流量特性测试系统研究

Research on Dynamic Response of Electronic Gasoline Injector and Flow Characteristics Test System

分析了进气道喷射式电控汽油喷油器的结构及工作原理,利用钢球完全开启及完全关闭时刻线圈电流曲线出现拐点的特点,提出一种基于线圈电流变化的电控汽油喷油器动态响应时间测量方法,并以单片机为控制核心开发了电控汽油喷油器动态响应及流量特性测试系统。试验结果表明,该检测系统能够对电控汽油喷油器的动态响应及流量特性进行高精度检测,开启延迟时间的相对测试误差小于1.67%,关闭滞后时间的相对测试误差小于1.56%,流量特性的测试误差小于0.01 mg。

A port injection type electronic gasoline injector is analyzed on its structure and operating principle.Based on the characteristics that the inflection points emerge in the coil current curve at the moment when the steel ball is fully open or fully closed, a dynamic response time measurement method of the electronic gasoline injector based on coil current variation is put forward. Using the single chip computer as ECU, a testing system has been developed to measure the dynamic response and flow characteristic. The test results show that the testing system can measure effectively and accurately the dynamic response and flow characteristics of the injector, with the relative error of the opening lag time less than 1.67 %, the relative error of the closing lag time less than 1.56 %, the test error of the flow characteristic is less than0.01mg.