Parked regeneration is carried out with the vehicle stationary under the manufacturer’s conditions, and it differs from the passive and active events that can occur during operation.
Three terms for one process
DPF regeneration oxidizes soot collected in a diesel particulate filter. The terms passive, active and parked describe aspects of how the vehicle provides the conditions for that process. They are useful distinctions, but the exact control strategy and driver instructions depend on the engine and vehicle.
Passive and active regeneration
Passive regeneration occurs when normal operating conditions provide suitable exhaust temperature and chemistry for soot oxidation. Active regeneration uses the engine or aftertreatment control strategy to raise the required temperature. An active event may take place during vehicle operation when its conditions are satisfied, so active does not automatically mean the truck must be stationary.
How parked regeneration works
A parked regeneration is an operation carried out while the vehicle is stationary under the manufacturer's specified conditions. It may be requested through driver controls or diagnostic software, depending on the vehicle and the situation. A technician-requested service routine may have different prerequisites from an ordinary driver request, even though both involve a stationary vehicle.
Use warnings and OEM procedures
Use the vehicle's warning information and OEM procedure to decide what action is appropriate. A request may be prevented by faults, unsuitable conditions or other system restrictions. Those reasons need investigation; they are not an invitation to bypass an interlock. High exhaust temperatures also require the specified location, preparation, supervision and protection of people and nearby materials.
Keep regeneration separate from repair
Keep regeneration separate from ash cleaning and fault repair. A completed event does not remove every type of deposit or prove that all aftertreatment components are healthy. Record the warning condition, related faults and outcome, then verify the system as directed. If a vehicle repeatedly needs intervention, investigate its operating pattern, maintenance and faults rather than treating regeneration as the complete repair.
More reading on parked regeneration
For the next step, see workshop-requested service regens and the causes of repeat filter warnings. Always use the vehicle’s own instructions, and the reference document gives a manufacturer’s overview of how these systems operate.
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