The ECM controls the actuators by applying a (low level) signal to the base of the transistor output drivers. These drivers, when switched on, will complete the ground circuit of each actuator. The actuators are controlled through a duty cycle (% time on/off), a controlled pulse width, or simply switched on or off as determined… Read More »
The Electronic Control Module (ECM) monitors and controls engine performance to ensure maximum performance and adherence to emissions standards. The ECM is also able to monitor and control vehicle features such as cruise control, transmission control, starter engagement, etc. See Figure “Electronic Control Module” . To understand how the ECM functions and how it can… 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 Injection Control Pressure system provides the necessary energy to hydraulically actuate the HEUI injector. Engine oil is the hydraulic fluid used by this system for this purpose. Oil is drawn from the oil pan through the pick-up tube by the engine oil lubrication pump. The lubrication pump is a gerotor type pump driven by… 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 »
A/C—Air Conditioning AC—Alternating Current ACC—Accessory A/D—Analog to Digital AMP—Ampere ASCII—American Standard Code for Information Interchange AT/MT—Allison AT.MT automatic transmission ATA—American Trucking Association AWG—American Wire Gauge BARO—Barometric Pressure Sensor BAT/BATT—Battery BNO—Brake Normally Open C—Celsius / Centigade CAP—Cold Ambient Protection system CEL—Check Engine Light CLS—Coolant Level Switch CMP—Camshaft Position Sensor; also referred to as TRS COL—Change Oil… Read More »