ADAPTER 7C7488 - Caterpillar

The Electronic Control Module (ECM) provides control of the air/fuel mixture for performance and for efficiency at low emission levels. The system includes the following components: maps in the ECM, output drivers in the ECM, air inlet pressure sensor, inlet manifold air temperature sensor, engine speed/timing sensor, generator output power sensor and fuel metering valve. Additionally, the customer input via the Caterpillar Electronic Technician (Cat ET) is required. Illustrations 1 and 2 are diagrams of the system main components and of the inputs for the system.For engines that are equipped with an Auxiliary Sensing Module (ASM), ASM receive inputs from the following sensors:
Generator output power sensor
Air inlet pressure sensor
Engine speed sensorThe ASM rapidly processes the signals from these sensors and passes the information to the master ECM via the Cat Data Link.
Illustration 1 g01443064
Diagram of the air/fuel ratio control
The engine is not equipped with an ASM.
Illustration 2 g01443066
Diagram of the air/fuel ratio control
The engine is equipped with an ASM.
Cat ET - This software is designed to run on a personal computer. Technicians can use the program to perform many functions. For the air/fuel ratio control, the technician programs configuration parameters into the ECM.Generator output power sensor - The engine control system requires an input which indicates the generator output in kilowatts. This input can be from the EMCP II+, from a programmable logic controller (PLC), or from a wattmeter. If the EMCP II+ is not used, the equipment that monitors the generator output is provided by the customer. The PLC or the wattmeter must provide an analog signal with a range of 0 to 5 VDC. The signal must use as much of this range as possible. The signal must be accurate within 0.5 percent of the generator actual output. The signal must have a linear relationship with the generator actual output in electrical kilowatts (ekW). Engines that are equipped with ASM are not compatible with EMCP II+ load signal.Inlet manifold air temperature sensor - This sensor monitors the temperature of the air/fuel mixture in the inlet manifold.Air inlet pressure sensor - This sensor monitors the pressure of the air/fuel mixture in the inlet manifold.Engine speed/timing sensor - This sensor monitors the rotation of a speed-timing wheel in order to provide information on the engine timing and on the engine rpm.Fuel metering valve - The valve is an electronically controlled actuator and a valve that regulates the flow of fuel. The device monitors the fuel temperature, the fuel pressure, and the valve differential pressure. The ECM sends a command signal for the fuel flow to the device. The device modulates the valve in order to match the command signal. The ECM communicates with the fuel metering valve via the CAN data link.Optional Fuel Quality Sensor - Some applications support an input for remote fuel quality. These engines can accept an input from a fuel quality sensor that is provided by the customer. The sensor performs continuous analysis of the fuel in order to determine the fuel LHV. The sensor provides