提出了一种新型电控汽油喷油器开启延迟时间在线检测方法，该方法通过分析喷油器的驱动电流波形来检测喷油器开启延迟时间。由于喷油器电磁阀衔铁完全吸合时喷油器才会完全开启，驱动电流在电磁阀衔铁完全吸合时会产生明显的电流拐点。该方法构建一种硬件电路以及检测逻辑，能在驱动电流出现拐点的时刻触发可检测的脉冲。通过分析触发脉冲的延迟时间以及脉宽，可准确得到喷油器开启的延迟时间。该技术不仅可以用于喷油器的出厂检测和日常维修，还可以移植到ECU中，在线检测喷油器的延迟时间，为喷油正时策略提供补偿依据。

A new on-line detection method was proposed to detect the opening delay time of electronically controlled gasoline injector. The method detected the opening delay time of fuel injector by analyzing the driving current waveform. Only when the armature of solenoid valve fully pulled in, the fuel injector would fully open. And the driving current would hence produce an obvious inflection point. This method constructed a hardware circuit and detection logic, which could trigger the detectable pulse when the driving current had the inflection point. By analyzing the delay time and pulse width of triggering pulse, the delay time of injector could be accurately obtained. The technology could be used for factory inspection and routine maintenance of fuel injector. It could also be transplanted to ECU to conduct online detection for the delay time of fuel injector, which provided the compensation basis for fuel injection timing strategy.