The ECM contains programmed performance maps (software) in order to define horsepower, torque curves, and rpm. The ECM uses this data in order to adjust the fuel delivery, injection pressure, and injection timing. The ECM uses data from engine performance that is gathered by several sensors. The ECM is a powerful computer that provides total electronic control of engine performance. The ECM is located on the left side of the engine. High actuation pressure of the oil results in high injection pressure of the fuel. Low actuation pressure of the oil results in low injection pressure of the fuel. Injection pressure is greater than actuation pressure of the oil by approximately six times. The actuation pressure of the oil generates the injection pressure that is delivered by the unit injector. The piston that is powered by engine lubrication oil under high pressure pushes the plunger. The piston is larger than the plunger by approximately six times. This multiplication of pressure is achieved by applying the force of the high-pressure oil to a piston. The HEUI operates in the same way as a hydraulic cylinder in order to multiply the force of the high-pressure oil. The high-pressure oil is called the injection actuation pressure. The HEUI uses engine lubrication oil that is pressurized from 6 MPa (870 psi) to 28 MPa (4061 psi) in order to pump fuel from the injector. The HEUI uses engine oil under high pressure in order to power the plunger. All fuel systems for diesel engines use a plunger and barrel in order to pump fuel under high pressure into the combustion chamber. The fuel system utilizes a hydraulically actuated electronically controlled unit injector. Hydraulic Electronic Unit Injector (HEUI) This fuel system consists of four basic components:
#Cat c9 engine specs software
Changes in performance are made by installing different software in the Electronic Control Module (ECM). Adjustments to the components that are mechanical cannot be made.
#Cat c9 engine specs free
The HEUI fuel system is free of adjustment. The operation of the Hydraulic Electronic Unit Injector fuel system is different from any other fuel system that is actuated mechanically. (11) Primary fuel filter and water separator (9) Sensor for the Injection Actuation Pressure (IAP) (7) Connector for the Injection Actuation Pressure Control Valve (IAPCV)
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