3, Electronic Fuel Injector

Electronic Fuel Injector Common Rail fuel system is the most critical and most complex components, ECU its role under the control signal sent by controlling the electromagnetic valve open and closed, high-pressure fuel oil track best Injection timing, and injection of diesel engine fuel injection rate is injected into the combustion chamber.

BOSCH ECD-U2 and the electronically controlled fuel injection similar to the structure are similar to the traditional injector nozzle of the control piston, control of holes, control solenoid valve components, Figure 5 for the electronically controlled fuel injection BOSCH Structure plans. No electricity in the solenoid valve, solenoid valve closure of the top of the control piston-A, high-pressure fuel rail pressure oil through hole of Z role in the control piston, the nozzle will be closed when the solenoid valve electricity, of A Hole opened , the control room quickly lower the pressure, control piston rises injector fuel injection began when closed solenoid valve, the pressure of increased control room and control the Pistons closed down injector fuel injection process completed.

Control of the fuel injection rate of the shape of its reasonable to optimize the design, implementation scheduled injection shape. Control Room size determines the volume of the sensitivity of the valve opening, the control room of the volume too much, at the end of the needle injection in the broken oil can not be achieved quickly, so that the latter part of the fuel atomization bad; volume control room is too small, not to provide adequate and effective needle trip to the blasting process flow resistance increased, the volume of the control room should also be in accordance with the largest models Injection Quantity reasonable choice.