Filter regeneration process
A vehicle includes an internal combustion engine. An exhaust system is connected to an exhaust output of the internal combustion engine. The exhaust system includes a passive storage component upstream of an electric heating unit and a selective catalytic reducer and a particulate filter downstream of the electric heating unit. A controller is controllably coupled to the exhaust system and configured to initiate a soot burn of the particulate filter while maintaining the passive storage component within a predetermined temperature range.
1 . A vehicle comprising:
an internal combustion engine, wherein operation of the internal combustion engine generates exhaust gasses;
an exhaust system connected to an exhaust output of the internal combustion engine, wherein the exhaust system is configured to receive the exhaust gasses, the exhaust system including a passive storage component, wherein the passive storage component is upstream of an electric heating unit, and the exhaust system further including a selective catalytic reducer and a particulate filter, wherein the selective catalytic reducer and the particulate filter are downstream of the electric heating unit; and
a controller controllably coupled to the exhaust system, wherein the controller is configured to initiate a soot burn of the particulate filter while maintaining a temperature of the passive storage component within a predetermined temperature range, and wherein the controller is configured to maintain the soot burn for a predetermined time period, the predetermined time period being a length of time where the length is determined prior to initiating the soot burn.
2 . The vehicle of claim 1 , wherein the passive storage component is a passive NOx adsorber.
3 . The vehicle of claim 1 , wherein the predetermined temperature range includes lower bound defined by a minimum temperature at which the particulate filter can regenerate via a soot burn and an upper bound defined by a maximum temperature at which the passive storage component can store particulate.
4 . The vehicle of claim 1 , wherein the predetermined temperature range includes lower bound of 500 degrees centigrade and an upper bound of 550 degrees centigrade.
5 . The vehicle of claim 1 , wherein the particulate filter is a selective catalytic reduction filter.
6 . The vehicle of claim 1 , wherein the particulate filter is a catalyzed diesel particulate filter.
7 . The vehicle of claim 1 , wherein the controller is configured to end the soot burn in response to a backpressure in an exhaust flow falling below a threshold and the predetermined time period elapsing.
8 . The vehicle of claim 1 , wherein initiating the soot burn of the particulate filter while maintaining the passive storage component within a predetermined temperature range occurs during operation of the vehicle.
9 . The vehicle of claim 1 , wherein the controller is configured to initiate the soot burn responsive to a backpressure of an exhaust flow exceeding a predetermined threshold.
10 . The vehicle of claim 1 , wherein the controller is configured to initiate the soot burn responsive to a period of time since a previous soot burn exceeding a predetermined threshold.
11 . A method for refreshing a particulate filter of an exhaust system of a vehicle, the method comprising:
initiating a soot burn of a particulate filter while maintaining a passive storage component within a predetermined temperature range using a controller;
maintaining the soot burn of the particulate filter until after a predetermined time period has elapsed, the predetermined time period being a length of time where the length is determined prior to initiating the soot burn; and
wherein the vehicle includes an internal combustion engine, an exhaust system connected to an exhaust output of the internal combustion engine, the exhaust system including the passive storage component upstream of an electric heating unit and a selective catalytic reducer and the particulate filter downstream of the electric heating unit and the controller being controllably coupled to the exhaust system.
12 . The method of claim 11 , wherein the passive storage component is a passive NOx adsorber.
13 . The method of claim 11 , wherein the predetermined temperature range includes lower bound defined by a minimum temperature at which the particulate filter can refresh via a soot burn and an upper bound defined by a maximum temperature at which the passive storage component can store particulate.
14 . The method of claim 11 , wherein the predetermined temperature range includes lower bound of 500 degrees centigrade and an upper bound of 550 degrees centigrade.
15 . The method of claim 11 , wherein the particulate filter is one of a selective catalytic reactor filter and a catalyzed diesel particulate filter.
16 . The method of claim 11 , wherein the controller is configured to maintain the soot burn for a predetermined time period.
17 . The method of claim 11 , wherein the controller is configured to end the soot burn in response to a backpressure in an exhaust flow falling below a threshold.
18 . The method of claim 11 , wherein initiating the soot burn of the particulate filter while maintaining the passive storage component within a predetermined temperature range occurs during operation of the vehicle.
19 . The method of claim 11 , wherein the controller is configured to initiate the soot burn responsive to one of a backpressure of an exhaust flow exceeding a predetermined threshold and a period of time since a previous soot burn exceeding a predetermined threshold.
20 . The method of claim 11 , further comprising ending the soot burn in response to the backpressure in an exhaust flow falling below a threshold and the predetermined time period elapsing.