Control system and method for preventing hydrocarbon slip during particulate matter filter regeneration

摘要

An engine control system includes an injection determination module and an injection regulation module. The injection determination module determines a desired rate of hydrocarbon (HC) injection into exhaust gas produced by an engine for regeneration of a particulate matter (PM) filter. The injection regulation module increases a rate of HC injection from a first rate to the desired rate during a predetermined period before regeneration of the PM filter, wherein the predetermined period is based on a difference between a predetermined temperature and a temperature at an outlet of an oxidation catalyst (OC).

主权项

1. An exhaust treatment system, comprising:
a hydrocarbon (HC) injector, a first electronic circuit configured to determine a desired rate of HC injection into exhaust gas produced by an engine for regeneration of a particulate matter (PM) filter; and a second electronic circuit configured to:
control the HC injector to inject HC into exhaust gas produced by the engine;select a target slope of a time-based ramp function based on a temperature at an outlet of an oxidation catalyst (OC) when regeneration of the PM filter is desired; and increase a rate of HC injection from a first rate to the desired rate using the time-based ramp function to regenerate the PM filter while preventing HC slip across the OC, wherein the rate at which the HC injection rate is increased is equal to the target slope of the time-based ramp function.