MANIFOLD 3P4862 - Caterpillar

Diesel System
Illustration 1 g02192355The fuel supply circuit is a conventional design for engines that use fuel injectors. The fuel supply circuit uses a fuel transfer pump to deliver fuel from the fuel tank to the electronic fuel injectors. The transfer pump is a fixed displacement gear pump.The fuel flows then through a fuel filter before entering the fuel supply manifold. A fuel priming pump is on the fuel filter base to fill the system. The system must be primed after the filter changes. The system must be primed after draining the fuel supply and return manifolds, when the fuel injectors are replaced.The fuel flows continuously from the fuel supply manifold through the fuel injectors. The fuel flows when either the supply or the fill port in the injector is not closed by the injector body assembly plunger. The fuel that is not injected into the cylinder is returned to the tank through the fuel return manifold.A pressure regulating valve is at the end of the fuel return manifold. The pressure regulating valve controls the entire fuel system pressure. The regulation provides proper filling of the fuel injectors.The electronically controlled mechanically actuated fuel injector system provides total electronic control of injection timing. The injection timing is varied to optimize the engines performance.The timing ring is part of the rear gear group. A signal is generated by the engine speed/timing sensor. This information is for detection of crankshaft position and for engine speed. Other information and these data allow the Electronic Control Module (ECM) to send a signal to the injector solenoids. The fuel injector solenoid is energized to begin fuel injection. The fuel injector solenoid is de-energized to end fuel injection. Refer to Systems Operation, "Fuel Injector".Gas System
The percentage of gas blending that is allowed is based on the load of the engine. The actual percent of blending that is allowed based on the load is determined by a map that is stored in the software. The load value that the map uses is the load that is determined by the load feedback signal. The load feedback signal is determined by Electronic Modular Control Panel (EMCP) from the total real power as a percent of total rated real power of the generator set. That signal gets sent back to the engine ECM from the EMCP via Pulse Width Modulated (PWM) signal or J1939 message. That load is then used by the engine ECM to determine the maximum amount of gas blending that can be allowed
Generator Total Apparent Power: This is simply the product of the voltage times the total current flow and is expressed in terms of VA or kVA.
Generator Total Real Power: This is the product of the voltage times the component of the total current that is in phase with the voltage and is expressed in terms of W or kW.The ECM provides control of the air/fuel mixture to the engine. Illustration 2 is a diagram of the fuel system main components. The flow of fuel through a