CONTROL OF REGENERATION IN A DIESEL AFTER-TREATMENT SYSTEM

摘要

A method is disclosed for controlling regeneration in a diesel engine after-treatment system having a diesel oxidation catalyst (DOC) and a diesel particulate filter (DPF). The method includes injecting an amount of fuel into an exhaust gas flow upstream of the DOC to superheat the gas flow and assessing a rate of the warm-up of the DOC. The method also includes determining, in response to the assessed rate of the warm-up of the DOC, an amount of catalyst substance available in the DOC for catalyzing the exhaust gas flow. The method additionally includes reducing the amount of fuel injected into the DOC such that the determined available amount of catalyst substance is utilized in the DOC for catalyzing the exhaust gas flow and a predetermined amount of fuel is permitted to slip through the DOC to maintain regeneration temperature in the DPF. A system and a vehicle are also disclosed.

主权项

1. A method of controlling regeneration in a diesel engine after-treatment (AT) system having a controller, a diesel oxidation catalyst (DOC), and a diesel particulate filter (DPF), the method comprising:
commencing, via a controller, a regeneration cycle “n”, wherein “n” is a positive integer, of the AT system by injecting an amount of fuel into an exhaust gas flow upstream of the DOC in order to superheat the exhaust gas flow and cause a warm-up of the DOC; assessing, via the controller, a rate of the warm-up of the DOC caused by the superheated exhaust gas flow; determining, via the controller, in response to the assessed rate of the warm-up of the DOC, an amount of catalyst substance available in the DOC for catalyzing the exhaust gas flow; and reducing, via the controller, the amount of fuel injected into the DOC such that the determined available amount of catalyst substance is utilized in the DOC for catalyzing the exhaust gas flow and a predetermined amount of fuel is permitted to slip through the DOC to maintain regeneration temperature in the DPF.