求翻译：高压供油泵的功能是控制出油量以产生高压燃油。它采用便于产生高压的凸轮驱动机构。泵控制阀关闭后柱塞的升程当量决定了出油量。通过对泵控制阀关闭时刻的控制，或者通过对凸轮预升程的控制来控制出油量，燃油在没有经过压缩的状况下进行回油并定量，从而减少了高压回油。因此，泵驱动扭矩明显地下降了。最大驱动扭矩只有直列泵的三分之一。是什么意思？

The high-pressure supply pump function is to control the oil to produce high-pressure fuel. It is easy to produce high pressure cam drive mechanism. Determine the fuel pump control valve is closed the plunger lift equivalent. Control the moment the pump control valve is closed, or by the cam pre-lif

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High pressure feed pump function is to control the amount of oil to produce high pressure fuel. It uses easy cam driving mechanism of high pressure. Plunger lift pump control valve is shut down after oil volume equivalent decisions. Through close pump control valve time control, or through the pre-l