Cat injectors

The personality module sets certain limits on the amount of fuel that can be injected.
The “FRC Fuel Limit” is a limit that is based on the boost pressure. The “FRC Fuel Limit” is used to control the air/fuel ratio for control of emissions.
When the ECM senses a higher boost pressure,the ECM increases the “FRC Fuel Limit”. A higher boost pressure indicates that there is more air in the cylinder. When the ECM increases the “FRC Fuel Limit”, the ECM allows more fuel into the cylinder.
The Rated Fuel Limit is a limit that is based on the power rating of the engine and engine rpm. The Rated Fuel Limit is similar to the rack stops and the torque spring on a mechanically governed engine. The Rated Fuel Limit provides the power curves and the torque curves for a specific engine family and a specific engine rating.These limits are controled by the personality module.

 

The Fuel Position is an internal signal within the ECM. The signal comes from the electronic governor and the signal then goes to the fuel injection control. The information that is gathered is based on the Desired RPM, the FRC Limit,the Rated Fuel Limit, and the actual engine rpm. the Fuel Ratio Control (FRC) is a limit that is based on the control of the fuel to air ratio. The FRC is used for purposes of emission control. When the ECM senses a higher boost pressure (more air into the cylinder), the FRC increases the FRC Limit (more fuel into the cylinder).the Rated Fuel Limit indicates the maximum allowable fuel position (longest injection pulse). This position will produce rated power for the engine configuration. the Fuel Temperature Sensor detects the fuel temperature. The ECM monitors the fuel temperature and the ECM adjusts the calculated fuel rate accordingly. the Full Load Setting (FLS) is the number that represents the fuel system adjustment. This adjustment is required in order to help ensure the maximum fuel delivery of the fuel system.the Full Torque Setting (FTS) is similar to the Full Load Setting and The injector codes or injector trim codes are numeric codes or codes that are etched or stamped on individual injectors. These codes are used to fine tune the fuel delivery.