C U M M I N S E N G I N E S
4-7
Regeneration is the process of converting the soot collected in the DPF into ash.
Under some operating conditions, such as low speed, low load, or stop and go duty cycles, the engine
may not have enough opportunity to regenerate the DPF during normal vehicle operation. When this
occurs, the engine will illuminate the DPF lamp to inform the vehicle operator that assistance is required,
typically in the form of operating the vehicle at highway speeds for approximately 20 minutes.
Heat is required for the regeneration process to occur. Regeneration can be classified into two different
types: passive regeneration and active regeneration.
Passive Regeneration
Passive regeneration occurs when the exhaust temperatures are naturally high enough to oxidize the soot
collected in the DPF faster than the soot is collected.
Passive regeneration typically occurs when the vehicle is driven at normal highway speeds and/or under
heavy loads.
Active Regeneration
Active regeneration occurs when the exhaust temperatures are not naturally high enough to oxidize the
soot in the DPF faster than it’s collected.
Active regeneration requires assistance from the engine in to increase the exhaust temperature. This is
typically accomplished by the engine injecting a small amount of diesel fuel into the exhaust stream,
which is then oxidized by the DOC, and creates the heat needed to regenerate the DPF.
Active regeneration will occur more frequently in vehicles operated at low speed, low load, or stop and go
duty cycles. Active regeneration only occurs if the engine ECM has detected that the DPF restriction has
reached a specified limit, and may only occur if the vehicle is moving above a preset speed threshold. The
engine ECM will activate and de-activate active regeneration as needed.
Active regeneration is largely transparent to the vehicle operator, the vehicle operator may notice an
increase in turbocharger noise during an active regeneration event, and may notice that the high exhaust
temperature lamp is illuminated, if the vehicle is so equipped.
During active regeneration, the exhaust temperature can be hotter than when the engine is operating at
full load. The exhaust temperature during a normal active regeneration event could reach 1100°F, and
possibly 1500°F under certain conditions.
Summary of Contents for PowerGlide 2019
Page 6: ...T I R E C A R E 1 1 TIRE CARE Chapter 1 ...
Page 14: ...B R A K E S Y S T E M 3 1 Brake System Chapter 3 ...
Page 17: ...B R A K E S Y S T E M 3 4 Compressed Air System 36 and 40 Bus Non Tag Tank Drains ...
Page 18: ...B R A K E S Y S T E M 3 5 43 Bus Tag Tank Drains ...
Page 21: ...B R A K E S Y S T E M 3 8 ...
Page 37: ...C U M M I N S E N G I N E S 4 17 ...
Page 38: ...S C H E D U L E D M A I N T E N A N C E 5 1 Scheduled Maintenance Chapter 5 ...
Page 45: ...S C H E D U L E D M A I N T E N A N C E 5 8 Lubrication Points ...
Page 46: ...S C H E D U L E D M A I N T E N A N C E 5 9 Lubrication Points ...
Page 47: ...S C H E D U L E D M A I N T E N A N C E 5 10 Lubrication Points ...
Page 48: ...S C H E D U L E D M A I N T E N A N C E 5 11 Lubrication Points ...
Page 53: ...S C H E D U L E D M A I N T E N A N C E 5 16 ...
Page 54: ...P R E T R I P I N S P E C T I O N 6 1 Pre Trip Inspection Chapter 6 ...
Page 57: ...I N S T R U M E N T S C O N T R O L S 7 1 Instruments Controls Chapter 7 ...
Page 84: ...I N S T R U M E N T S C O N T R O L S 7 28 MENU MAP SETTINGS MENUS Settings Menus ...
Page 92: ...I N S T R U M E N T S C O N T R O L S 7 36 ...
Page 93: ...A I R S U P P L Y 8 1 Air Supply Chapter 8 ...
Page 95: ...A I R S U P P L Y 8 3 ...
Page 96: ...T A G A X L E 9 1 Tag Axle Chapter 9 ...
Page 98: ...W A R R A N T Y 10 1 Warranty Chapter 10 ...
Page 100: ...W A R R A N T Y 10 3 ...
