INJECTOR GP-FUEL 4537576 - Caterpillar

General Information
Regeneration is the removal of soot from the Diesel Particulate Filter (DPF). Active and passive regeneration are used to regenerate the DPF. The DPF traps both soot and ash. The soot is removed during regeneration. The ash is removed through a cleaning process. Refer to the Operation and Maintenance Manual, "Diesel Particulate Filter - Clean/Replace" for more information on the service of the DPF.Modes of Regeneration
Passive - Passive Regeneration occurs when the exhaust temperature is high enough for regeneration to occur. Passive regeneration may occur unnoticed by the operator. No operator action is required. Operating the machine above mid throttle and under load allows for passive regeneration during normal operation. Low idle and low load applications will have lower exhaust temperatures, where passive regeneration is not possible.Active - An active regeneration is a late injection of fuel into the combustion chamber, which sufficiently raises the exhaust temperature for an active regeneration. The engine ECM uses multiple inputs from the engine to determine when an active regeneration is needed. All applications, even high load, will require active regenerations. However, active regeneration will not occur as frequently as low idle and low load applications.
Illustration 1 g03395636
(1) Active regeneration threshold Note: The green area is the active regeneration threshold.There will be a slight change in the exhaust noise during an active regeneration. Active regenerations may require the engine rpm to be above the active regeneration threshold. The active regeneration may take up to 30 minutes to complete.When an active regeneration is required with the parking brake and hydraulic lockout engaged, automatic adjustments of the engine speed by the ECM may occur to keep the engine RPM above the active regeneration threshold.When an active regeneration is required and the machine is being operated below the active regeneration threshold, the DPF alert indicator may illuminate. The operator can increase the rpm above the active regeneration threshold with the Engine Speed Control Knob. An active regeneration will occur and the DPF light will turn off.If increasing the RPM is not acceptable, alternatively the operator can allow a parked regeneration. In order for a parked regeneration to occur. The engine must be at low idle, the parking brake engaged, and the hydraulic lockout engaged. If those conditions are met for approximately 2 minutes, the ECM will slowly increase the engine rpm and an active regeneration will begin. After completing the active regeneration the engine speed will slowly decrease down to low idle.The following chart describes the alert indicators and what actions, if any, the operator needs to perform in order to allow an active regeneration.Warning Symbols
1 - DPF
2 - Alert
3- Engine Condition Indicator
4- Cab AlarmEngine Emission Alert
Table 1
Warning Symbol Machine Action Operator Action
None If the parking brake and hydraulic lockout are engaged, the ECM may increase the engine speed No action required.
1 Amber If the parking brake is not engaged and the engine speed is below the green shaded area on the Engine Speed Control Knob, the DPF light will turn on. Increase the engine