The Injection Control Pressure Regulation System (IPR_SYS) consists of the low pressure oil lubrication system, passages in the front cover and reservoir, high pressure oil pump, high pressure oil line, as well as the high pressure oil rail that is mounted on the side of the cylinder head. The system also includes the injectors and… Read More »
The Injector Pressure Regulator (IPR) is a variable position valve that controls injection control pressure. The ECM uses many input variables to determine the desired injection control pressure. For the IPR function diagram, see Figure “Injection Pressure Regulator Function Diagram” . Figure 1. Injection Pressure Regulator Function Diagram Section 33.1.1 Output Functions Battery voltage is… Read More »
Signal functions include High Side Drive Outputs and Low Side Drive Return. For the Injector Drive Circuit (INJ) function diagram, see Figure “Injector Drive Circuit Function Diagram” . Figure 1. Injector Drive Circuit Function Diagram High Side Drive Outputs — The high side drive outputs control the individual injector on-time, injection timing and sequencing (firing… Read More »
The Injection Control Pressure (ICP) sensor is a variable capacitance sensor that, when supplied with a 5 volt reference signal from the ECM, produces a linear analog voltage signal that indicates pressure. The ICP sensor’s primary function is to provide a feedback signal to indicate injection control pressure to enable the ECM to command the… Read More »
Some Series 40E electronic engines are equipped with split-shot injectors. On these injectors the injection cycle is executed in two stages. Some fuel is pre-injected into the combustion chamber to initiate the combustion and, once initiated, the primary injection takes place. This feature reduces emission levels at light load operations. It also reduces light load… Read More »
The injection operation is divided into three stages or cycles: Fill stage Injection stage End of injection During the fill stage, the solenoid is de-energized and the poppet valve is in the closed position preventing the flow of high pressure oil to the intensifier piston. At this point the intensifier piston is in the upper… Read More »
The injection control pressure regulator valve is a pulse width (Duty cycle %) modulated valve operating at 400 Hz. The pulse width is modulated between 8 to 60% to control ICP pressure in the range of 3.4 to 20 kPa (500 to 3000 lb/in.2 ). The regulator is mounted in the high pressure pump and… Read More »
The ECM controls the injection control pressure by operating the injection control pressure regulator (IPR). See Figure “Injection Control System” . The result of this control is continuously monitored by the ECM using the injection control pressure sensor (ICP). The pressure signal obtained from the ICP allows the ECM to know the actual injection control… Read More »
The fuel supply pump produces the necessary vacuum to draw the fuel from the fuel tanks. See Figure “Fuel System Diagram” . Fuel from the tanks flows through the strainer that filters out any large contaminants that may be present in the fuel. From the strainer the fuel flows to the supply pump. This pump… Read More »
The fuel system consists of three major subsystems: Fuel Supply System Injection Control Pressure System Fuel Injector These subsystems work together to inject pressurized fuel into the combustion chambers. The function of the fuel supply system is to deliver fuel to the injectors. The injection control pressure system supplies the injectors with high pressure oil… Read More »