The ECU accomplishes the fast energizing of the solenoid valve by driving circuit with high frequency PWM, and detects the start of injection by the differential signal of driving current.
采用高频脉宽调制功率驱动电路进行电磁阀的高速强力驱动，并利用电流微分信号有效反馈了控制阀关闭始点。
The method employed high-frequency voltage-signal injection to make motor form a high-frequency current-vector, of which the negative component current contained rotor space-position information.
该方法采用高频电压载波注入方式形成高频电流矢量，其负序分量包含了转子空间位置信息。
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