Detroit Diesel Electronic Controls Rail Pressure Sensor Pressure Limiting Valve Common Rail Flow Limiter Injectors MDEC OR DDECI V Controlled High Pressure Pump with Pre-Supply Pump DDEC IV ECM DDEC IV ECM Sensors DDECIV electronics control the beginning of injection or timing of the event and the duration of the injection event, which determines the amount of fuel being injected. Timing of the injection event is totally a function of DDECIV and not that of the camshaft lobe profile as in other fuel systems. DDECIV sends a signal to the injector solenoid to inject fuel into the cylinders.
To provide this control, DDECIV electronics utilize state of the art microprocessors to gather information from the engine and its operating environment to be used in determining the optimum schedule of fuel injection. Part of the information gathered is from the fuel system itself. DDECIV receives feedback for the injector solenoids as to their performance in the form of Response Times as seen in the DDEC printout shown in Fig. 9. Fig. 8 Fig. 9 Injector Response Times Printout. Page 9