System and method for particulate filter regeneration
View Patent ↗In one exemplary embodiment of the invention, a method for controlling regeneration for an exhaust system of an internal combustion engine, wherein the exhaust system includes a particulate filter is provided, where the method includes determining a mass flow rate of oxygen received from the internal combustion engine, determining a particulate mass within the particulate filter, determining a desired particulate burn rate based on the mass flow rate of oxygen and the particulate mass and determining a current particulate burn rate. The method also includes determining a correction value based on the desired particulate burn rate and the current particulate burn rate, determining a temperature set point for exhaust gas entering the particulate filter based on the correction value, an engine speed and an engine load and communicating a signal, from a controller, to control a parameter for a regeneration system based on the determined temperature set point.
1. A method for controlling regeneration for an exhaust system of an internal combustion engine, wherein the exhaust system comprises a particulate filter, the method comprising:
determining a mass flow rate of oxygen received from the internal combustion engine;
determining a particulate mass within the particulate filter;
determining a desired particulate burn rate based on the mass flow rate of oxygen and the particulate mass;
determining a current particulate burn rate at the particulate filter during a regeneration of the particulate filter;
determining, by a controller comprising a processor coupled to a memory, a correction value based on the desired particulate burn rate and the current particulate burn rate;
determining a temperature set point for an exhaust gas entering the particulate filter that is independent of a distance between the internal combustion engine and the particulate filter based on the correction value, an engine speed and an engine load; and
performing a regeneration of the particulate filter based on the determined temperature set point.
2. The method of claim 1 , wherein determining the correction value comprises determining a correction ratio based on the desired particulate burn rate and current particulate burn rate.
3. The method of claim 1 , comprising determining an exhaust gas set point temperature correction based on a table in the controller using the correction value as an input.
4. The method of claim 1 , further comprising communicating a signal, from the controller, to control a parameter for a regeneration system, wherein the parameter is for at least one selected from the group consisting of: a hydrocarbon injector, a heating device and a fuel injector configured to provide fuel post-injection to a cylinder.
5. The method of claim 4 , wherein the parameter comprises at least one selected from the group consisting of: a hydrocarbon injector flow rate, a fuel flow rate and a current or voltage to the heating device.
6. The method of claim 1 , wherein determining the correction value comprises determining a deviation value based on a difference between the desired particulate burn rate and the current particulate burn rate.
7. The method of claim 6 , wherein determining the deviation value is based on the difference between desired and current burn rates, and a determined exhaust gas mass flow.
8. A system comprising:
a particulate filter coupled to a conduit that receives an exhaust gas from an internal combustion engine; and
a controller coupled to an oxygen mass flow sensor, the controller comprising a processor coupled to a memory, the controller configured to perform a method, the method comprising:
determining a mass flow rate of oxygen received from the internal combustion engine;
determining a particulate mass within the particulate filter;
determining a desired particulate burn rate based on the mass flow rate of oxygen and the particulate mass;
determining a current particulate burn rate at the particulate filter during a regeneration of the particulate filter;
determining a correction value based on the desired particulate burn rate and the current particulate burn rate;
determining a temperature set point for exhaust gas entering the particulate filter that is independent of a distance between the internal combustion engine and the particulate filter based on the correction value, an engine speed and an engine load; and
communicating a signal to control a parameter for a regeneration system to adjust the regeneration based on the determined temperature set point.
9. The system of claim 8 , wherein determining the correction value comprises determining a correction ratio based on the desired particulate burn rate and current particulate burn rate.
10. The system of claim 8 , comprising determining an exhaust gas set point temperature correction based on a table using the correction value as an input.
11. The system of claim 8 , wherein communicating the signal to control the parameter for the regeneration system comprises controlling a parameter for at least one selected from the group consisting of: a hydrocarbon injector, a heating device and a fuel injector configured to provide fuel post-injection to a cylinder.
12. The system of claim 11 , wherein the parameter comprises at least one selected from the group consisting of: a hydrocarbon injector flow rate, a fuel flow rate and a current or voltage to the heating device.
13. The system of claim 8 , wherein determining the correction value comprises determining a deviation value based on a difference between the desired particulate burn rate and the current particulate burn rate.
14. The system of claim 13 , wherein determining the deviation value is based on the difference between desired and current burn rates, and a determined exhaust gas mass flow.
15. A method of regenerating a particulate filter comprising:
flowing an exhaust gas from an internal combustion engine into a particulate filter;
determining a mass flow rate of oxygen received from the internal combustion engine;
determining a particulate mass within the particulate filter;
determining a desired particulate burn rate based on the mass flow rate of oxygen and the particulate mass;
determining a current particulate burn rate at the particulate filter during a regeneration of the particulate filter;
determining, by a controller comprising a processor coupled to a memory, a correction value based on the desired particulate burn rate and the current particulate burn rate;
determining a temperature set point for exhaust gas entering the particulate filter that is independent of a distance between the internal combustion engine and the particulate filter based on the correction value, an engine speed and an engine load; and
performing a regeneration of the particulate filter based on the determined temperature set point, wherein the regeneration reduces the particulate mass in the particulate filter.
16. The method of claim 15 , wherein determining the correction value comprises determining a correction ratio based on the desired particulate burn rate and current particulate burn rate.
17. The method of claim 15 , wherein performing the regeneration of the particulate filter based on the determined temperature set point comprises communicating a signal from the controller to control a parameter for at least one selected from the group consisting of: a hydrocarbon injector, a heating device and a fuel injector configured to provide fuel post-injection to a cylinder.
18. The method of claim 17 , wherein the parameter comprises at least one selected from the group consisting of: a hydrocarbon injector flow rate, a fuel flow rate and a current or voltage to the heating device.
19. The method of claim 15 , wherein determining the correction value comprises determining a deviation value based on a difference between the desired particulate burn rate and the current particulate burn rate.
20. The method of claim 19 , wherein determining the deviation value is based on the difference between desired and current burn rates, and a determined exhaust gas mass flow.