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单选题
电控柴油机控制系统中,当CCM根据曲柄轴编码器送来的曲柄角度信号和VIT,就可计算出喷射初始角,到达喷射初始角时刻CCM给VDM发喷油指令,使共轨电磁阀通电,如:低速、低负荷时,()。
A
只需一个电磁阀工作
B
只需两个电磁阀工作
C
只需三个电磁阀工作
D
只需四个电磁阀工作
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