通过分析车辆电子控制单元输出的点火开关和燃油喷射信号波形在高功率微波辐射条件下的演变过程，阐明了高功率微波致使车辆发动机熄火的原因。研究结果表明，电子控制单元受到微波辐射扰乱后，点火开关信号发生意外丢失，燃油喷射信号脉冲重复周期迅速缩短，造成发动机气缸内喷入过量燃油，火花塞无法点燃油气混合物，迫使发动机转速下降甚至熄火。通过分析车辆发动机的点火系统工作原理，提出了根据监测车体辐射电磁信号获取车辆易受攻击的敏感频段的试验思路。%Mechanism of engine forced stall by high power microwave radiation is clarified by analyzing the evolutionary process of fuel injector and ignition signal outputted by electronic control unit. Experimental results suggest that accidental loss of ignition signals occurs under the condition of microwave radiation disruption. The pulse repetition interval of fuel injec-tor signals also rapidly decreases. Because excess gasoline is ejected into engine cylinder, mixture of gasoline and air cannot be ignited by spark plug, and the engine speed is forced slowdown until completely stop. The principle of ignition system of engine is analyzed. Measured method of frequency susceptibility for vehicle engine is proposed by monitoring the emitted e-lectromagnetic signal of the engine.
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