Method and apparatus to control regeneration of a particulate filter

Patent metadata

Field	Value
Publication number	US-9441525-B2
Application number	US-201514701823-A
Country	US
Kind code	B2
Filing date	May 1, 2015
Priority date	Jun 27, 2012
Publication date	Sep 13, 2016
Grant date	Sep 13, 2016

Abstract

An internal combustion engine is fluidly coupled to an exhaust aftertreatment system including a particulate filter. A method for operating the internal combustion engine includes determining an expected boost pressure of an intake air compressor system in response to an output torque request, determining a deviation between an actual boost pressure and the expected boost pressure, determining a engine-out soot generation rate correction based upon the deviation between the actual boost pressure and the expected boost pressure, adjusting a steady-state engine-out soot generation rate using the engine-out soot generation rate correction, time-integrating the adjusted steady-state engine-out soot generation rate, and commanding regeneration of the particulate filter when the time-integrated adjusted engine-out soot generation rate exceeds a predetermined threshold.

First claim

The invention claimed is:

1. A method for operating an internal combustion engine fluidly coupled to exhaust aftertreatment system including a particulate filter, comprising:
determining an expected boost pressure of an intake air compressor system in response to an output torque request;
determining a deviation between an actual boost pressure and the expected boost pressure;
determining a engine-out soot generation rate correction based upon the deviation between the actual boost pressure and the expected boost pressure;
adjusting a steady-state engine-out soot generation rate using the engine-out soot generation rate correction;
time-integrating the adjusted steady-state engine-out soot generation rate; and
regenerating the particulate filter when the time-integrated adjusted engine-out soot generation rate exceeds a predetermined threshold.

2. The method of claim 1 , wherein adjusting the steady-state engine-out soot generation rate comprises:
identifying a boost control state comprising one of an open-loop control state and closed-loop control state; and
adjusting the steady-state engine-out soot generation rate using the engine-out soot generation rate correction when the identified boost control state comprises the closed-loop control state.

3. A method for operating an internal combustion engine including an intake air compressor system and fluidly coupled to an exhaust aftertreatment system including a particulate filter, comprising:
determining a total engine-out soot generation based upon a summation of a steady-state engine-out soot generation rate and an engine-out soot generation rate correction that is one of zero when said intake air compressor system is closed-loop controlled and a rate based upon a deviation between an actual boost pressure and an expected boost pressure from the intake air compressor system;
regenerating the particulate filter when the total engine-out soot generation exceeds a predetermined threshold.

4. The method of claim 3 wherein said steady-state engine-out soot generation rate is determined based upon an engine operating point comprising engine speed and load.

5. The method of claim 3 wherein said total engine-out soot generation is determined through an integration of said summation of the steady-state engine-out soot generation rate and the engine-out soot generation rate correction.

6. The method of claim 5 wherein said steady-state engine-out soot generation rate is determined based upon an engine operating point comprising engine speed and load.

7. The method of claim 6 wherein said steady-state engine-out soot generation rate is further determined based upon a barometric pressure correction.

Assignees

• Gm Global Tech Operations Llc

Inventors

• Swoish Christopher C
• Sarsen Douglas Christopher
• Whitt Christopher
• Larose Jr Thomas

Classifications

• Y02T10/47

  Cross-Sectional Technologies · mapped topic

• F01N2900/08

  said parameters being related to the engine · CPC title

• F01N9/005

  using models instead of sensors to determine operating characteristics of exhaust systems, e.g. calculating catalyst temperature instead of measuring it directly · CPC title

• F02D41/0007

  for control of turbo-charged or super-charged engines (control of the pumps per se F02B37/12) · CPC title

• F01N3/021

  by means of filters · CPC title