Note: Refer to Cat ET and the Troubleshooting manual for more information on programming the monitoring system parameters.
The engine is equipped with a programmable Cat Monitoring System. The Electronic Control Module (ECM) monitors the operating parameters of the engine. The ECM can initiate responses if a specific engine parameter exceeds an acceptable range. Three possible responses may be available for each parameter: "WARNING", "DERATE", and "SHUTDOWN". Some of the responses are not available for some of the parameters. An ET service tool is used to perform the following activities:
- Select the available responses.
- Program the level for monitoring.
- Program delay times for each response.
The default settings for the parameters are programmed at the factory. To accommodate unique applications and sites, the parameters may be reprogrammed with an ET service tool.
The screens of the ET service tool provide guidance for the programming. The following options can be programmed "ON" or "OFF": "WARNING", "DERATE", and "SHUTDOWN".
The screens of the ET service tool also provide guidance for changing setpoints. For information on programming the Cat Monitoring System, use the appropriate ET service tool and see the Service Manual, "Troubleshooting" module.
The Cat Monitoring System is enabled after the engine is started. When the engine rpm exceeds 50 rpm below low idle, the ECM begins checking parameters. The ECM monitors the parameters to determine if the parameters exceed the setpoints.
If the monitoring system initiates a warning, a deration, or a shutdown, the event is logged in to the ECM. This event occurs even if the parameter is programmed "OFF". If a setpoint for a parameter is exceeded, the event will be logged.
Any failure of a sensor will result in disabling the corresponding portion of the monitoring system. The failure of a sensor will cause an "ACTIVE" diagnostic code for the sensor.
The derating is cumulative. For example, a derating of 5 percent followed by a derating of 2% results in a total derating of 7%. If the conditions that cause the derating are not corrected, the derating will continue.
Dynamic Gas Blending (DGB) Control System
The DGB control system processes engine and load feedback data and determines the optimum gas fuel requirements. The DGB processing allows for adjustment of gas and diesel ratio during operation. The DGB control system comprises of the following:
Integrated Sensor Module (ISM) - The ISM monitors combustion and communicates data to the Engine Control Module (ECM) and control system to adjust and protect the engine.
Engine Control Module (ECM) - The ADEM 4 ECM allows the DGB system to operate at maximum efficiency to insure timely adjustments to the diesel and natural gas fuel system.