This process involves a compressor and with it associated thermal, mechanical and pumping losses, which affect fuel consumption.
这一过程涉及压缩机和与之相关的热，机械和抽水的损失，影响燃料的消耗。
Under low to medium load levels, the valves are set for low lift and early closure to reduce pumping losses and improve fuel economy.
低中负荷水平下，阀门设置较低的升力系数和早期关闭泵损失减少，提高燃油经济性。
It also minimises the pumping losses caused by no longer having to "throttle" (ie, strangle) the air flowing into the cylinders in order to control the engine speed.
这样还把由于不必再为了控制引擎转速来抑制空气流入引起的抽吸效应的能耗最小化。
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