求翻译：日本电装（Denso）公司率先在上世纪九十年代初推出了名为ECD-U2的共轨燃油喷射系统。ECD-U2共轨喷油系统由高压供油泵、共轨、喷油器以及控制这些部件的电子控制单元和各种传感器等组成（如图1）。系统利用泵控制阀改变高压供油泵的燃油出油量来控制共轨压力，共轨压根据发动机负荷和转速确定的数值而调节。泵控制阀与燃油压力传感器相结合进行共轨压力的闭环控制。是什么意思？

Japan's Denso (denso), first introduced in the early 1990s named ecd-u2 common-rail fuel injection system. ecd-u2 common rail injection system by high-pressure feed pumps, common rail, fuel injectors, and control of these components electronic control unit and various sensors and other components (F

Nippondenso (Denso) company at the forefront in the early 1990s introduced the named ECD U 2 - the common rail fuel injection system. U ECD - 2 Common Rail fuel injection system by high pressure pump, rail, injectors, as well as control of these parts of the electronic control unit and a variety of

Japan Denso (Denso) company took the lead in the early 90 introduced the common rail fuel injection system called ECD-U2. ECD-U2 by the high pressure common rail fuel injection system for pumps, common rail, injectors and control over those parts of the electronic control unit and a variety of senso