Method and system for determining temperature set points in systems having particulate filters with regeneration capabilities

A method for determining a particulate filter temperature set point (Tset) value for a particulate filter, wherein the Tset value is used to control regeneration of particulates captured by the particulate filter, the method comprising:

• determining a critical temperature (Tc) value for the filter, the Tc value corresponding with a maximum temperature to which the filter may be desirably exposed during regeneration before risking heat damage;
• determining a temperature adjustment (Ta) value for the filter, the Ta value reflecting thermal inertia of the filter during regeneration;
• determining the Tset value as a function of the Tc and Ta values;
• and
• determining the Tc value from a Tc value lookup table which correlates Tc values according to a first ratio and a second ratio, the first ratio characterized by soot accumulation of the filter and exhaust space velocity through a particulate canister and the second ratio characterized by exhaust gas oxygen concentration and thermal characteristics of the filter.

A method for determining a particulate filter temperature set point (Tset) value for a particulate filter, wherein the Tset value is used to control regeneration of particulates captured by the particulate filter, the method comprising:

• determining a critical temperature (Tc) value for the filter, the Tc value corresponding with a maximum temperature to which the filter may be desirably exposed during regeneration before risking heat damage;
• determining a temperature adjustment (Ta) value for the filter, the Ta value reflecting thermal inertia of the filter during regeneration;
• determining the Tset value as a function of the Tc and Ta values;
• and
• determining the Ta value according to the following formula:
• 1
• M
• .
• exh
• ⁢
• Cp
• exh
• ⁢
• R
• thermal
• ⁢
• (
• T
• i
• -
• Tf
• )
• wherein, Rthermal is thermal resistance of the filter, Cpexh is exhaust gas heat capacity, Mexh is exhaust gas mass flow, Ti is exhaust gas temperature at an inlet through which the exhaust gases enter a particulate canister, and Tf is temperature of the particulate filter.

A method for determining a particulate filter temperature set point (Tset) value for a particulate filter, wherein the Tset value is used to control regeneration of particulates captured by the particulate filter, the method comprising:

• determining a critical temperature (Tc) value for the filter, the Tc value corresponding with a maximum temperature to which the filter may be desirably exposed during regeneration before risking heat damage;
• determining a temperature adjustment (Ta) value for the filter, the Ta value reflecting thermal inertia of the filter during regeneration;
• determining the Tset value as a function of the Tc and Ta values comprising;
• and
• determining Tset to be greater than the Tc value if the Ta value indicates the thermal inertia of the filter is below a thermal inertia threshold, the thermal inertia threshold corresponding with a desired rate of temperature of increase for the filter.

A method for determining a particulate filter temperature set point (Tset) value for a particulate filter, wherein the Tset value is used to control regeneration of particulates captured by the particulate filter, the method comprising:

• determining a critical temperature (Tc) value for the filter, the Tc value corresponding with a maximum temperature to which the filter may be desirably exposed during regeneration before risking heat damage;
• determining a temperature adjustment (Ta) value for the filter, the Ta value reflecting thermal inertia of the filter during regeneration;
• and
• determining the Tset value as a function of the Tc and Ta values;
• and
• determining Tset to be less than the Tc value if the Ta value indicates the thermal inertia of the filter is greater than a thermal inertia threshold, the thermal inertia threshold corresponding with a desired rate of temperature of increase for the filter.