NUT 1B7413 - Caterpillar

Cat G3600 engines with ADEM A4 ECM are designed to provide power for the following applications:
Electrical power generation
Gas compression
Industrial air compression
PetroleumThe engines incorporate advanced technology that is essential for obtaining high output, low emissions, and thermal efficiency.Precise control of the engine parameters enable optimum engine performance. The engines can use various fuels in various ambient conditions.The ADEM A4 Engine Control Module (ECM) controls most of the functions of the engine. The module is an environmentally sealed unit that is mounted in a junction box on the engine. The ECM monitors various inputs from sensors to activate relays, solenoids, and other parts at the appropriate levels.The ECM monitors the actual engine speed. The ECM calculates the difference between the actual engine speed and the desired engine speed. The ECM controls the fuel actuator to maintain the desired engine speed.The ECM regulates inlet air, exhaust bypass, and fuel. Two electrohydraulic actuators control inlet air and exhaust bypass. The hydraulic oil is in a circuit that is separate from the engine oil. The hydraulic oil is circulated by a gear-driven pump. An electronic valve with a self-contained motor, separate from the hydraulic actuators, controls the fuel.The ECM operates the fuel valve to allow fuel to enter the gas manifold. Fuel flows from the manifold through an orifice. Some of the gas is routed through an adjustable needle valve and into a precombustion chamber. The rest of the gas is routed through a gas admission valve that is actuated by the camshaft. This process allows fuel to enter the inlet port in the cylinder head.Air for combustion flows from the turbocharger to an air inlet choke. The ECM operates the air choke actuator to allow air to enter the inlet air manifold. The air flows through the aftercooler to the air plenum and into the cylinder head inlet port. The air is mixed with gas in the cylinder head. The rich fuel in the precombustion chamber is ignited by the spark plug. This ignition provides the ignition for the air/fuel mixture in the cylinder.The inlet manifold air pressure is controlled by the air inlet choke and the exhaust bypass valve. The ECM determines the air pressure that is required to maintain the correct air/fuel ratio.Each cylinder has an ignition transformer. To initiate combustion, the ECM sends a pulse of approximately 108V to the primary coil of each ignition transformer. The transformer increases the voltage which creates a spark across the spark plug electrode.The electronic control system controls the ignition timing. The control system monitors changes in the load. The control system modifies the timing in response to the change in the load. The timing can also be modified to compensate for detonation that is detected.The fuel flow is the main factor in the calculation of the engine load. A fuel flow that is greater than fuel flow at idle is used to calculate a percentage of the indicated load.The engine has one Integrated Sensing Module (ISM). Each cylinder exhaust port has a