ADAPTER 1U1554 - Caterpillar

Illustration 1 g01019009Cat 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.Inlet manifold temperature sensor - This sensor monitors the temperature of the air/fuel mixture in the air inlet manifold.Inlet manifold pressure sensor - This sensor monitors the pressure of the air/fuel mixture in the air 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.Wattmeter - The engine's control system requires an input which indicates the generator's output in kilowatts. This input can be from the following components: EMCP II+, programmable logic controller (PLC) and wattmeter. The equipment that monitors the generator's output is provided by the customer if the EMCP II+ is not used. The PLC or the wattmeter must provide an analog signal within the range of 0 to 5 volts. The output must have a linear relationship with the generator's actual output in electrical kilowatts (ekW). The output must be accurate within 0.5 percent of the generator's actual current. The out put must use as much the acceptable range as possible.Fuel metering valve - This 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's 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.The air/fuel ratio control has two basic modes of operation:
Open loop
Charge density feedbackThe modes of operation are explained below.For proper operation of the air/fuel ratio control, input from the customer is necessary.Input from the Customer
To accurately control the air/fuel ratio, the control system depends on input from the customer.Before the initial start-up, a current gas analysis is required. Data from the gas analysis must be entered into Caterpillar Software, LERW4485, "Gas Engine Rating Pro (GERP)". The results are programmed into the ECM.Note: It is very important to use the Caterpillar Software, LERW4485, "Gas Engine Rating Pro (GERP)". Use of only the data from the gas analysis can result in incorrect settings.The following parameters are programmed into the ECM via the "Configuration" screen of Cat ET:
"Fuel Quality"
"Gas Specific Gravity"
"Fuel Specific Heat Ratio"
Four inputs for the engine loadNote: For more details on these topics, refer to Systems Operation/Testing and Adjusting, "Electronic Control System Parameters"."Fuel Quality" - This is the fuel's Low Heating Value (LHV). The value is obtained from a fuel analysis