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4.康明斯Celect低压燃油系统Celect系统(见图10)也是低压燃油系统,Celect Plus是其改进型。其原理与PT燃油系统的齿轮式燃油泵相似,出口有断油电磁阀。系统的压力和流量随柴油机转速成比例变化,额定转速下,系统的压力范围为965～1034kPa。Celect系统类似于CAT的EUI系统,只是单体式喷油器的内部结构不同,喷油器也是由凸轮轴通过摇臂和推杆组件驱动。ECM(柴油机电脑板)将脉宽调制(PWM)信号送至各喷油器,在柱塞被摇臂组件向下推动过程中,PWM信号起始决定喷油的开始,PWM信号的
4. Cummins Celect Low-Pressure Fuel Systems The Celect System (see Figure 10) is also a low-pressure fuel system and the Celect Plus is an improved version. Its principle and PT fuel system gear pump similar to the export of off-oil solenoid valve. System pressure and flow vary in proportion to the speed of the diesel engine. At rated speed, the pressure range of the system is 965 to 1034 kPa. The Celect system is similar to CAT’s EUI system, except that the internal structure of a single fuel injector is different, and the fuel injector is also driven by the camshaft via the rocker and push rod assembly. The ECM (Diesel Engine Board) sends a pulse-width modulated (PWM) signal to each injector. As the plunger is pushed down by the rocker arm assembly, the PWM signal begins to determine the start of fuel injection. The PWM signal