Exhaust system and method for controlling temperature of exhaust gas in an exhaust system

摘要

In one exemplary embodiment of the invention, an internal combustion engine includes a fuel system in fluid communication with a cylinder to direct a fuel flow to be mixed with air in the cylinder and an exhaust system in fluid communication with the cylinder to receive an exhaust gas produced by the combustion process, wherein the exhaust system includes an oxidation catalyst, a particulate filter downstream of the oxidation catalyst. The system also includes a control module that determines an amount of energy to be provided by at least one of: a post-injection process, hydrocarbon injector, and heating device, wherein the amount of energy is based on a desired temperature at a selected location in the exhaust system, an exhaust gas flow rate, a temperature of the received exhaust gas, a flow rate and temperature of the exhaust gas at the inlet of the oxidation catalyst.

主权项

1. An internal combustion engine system comprising:
a cylinder; a fuel system in fluid communication with the cylinder to direct a fuel flow to be mixed with air in the cylinder for a combustion process; an exhaust system in fluid communication with the cylinder to receive an exhaust gas produced by the combustion process, wherein the exhaust system includes an oxidation catalyst, and a particulate filter downstream of the oxidation catalyst; and a control module programmed to: determine an amount of energy to be provided to the exhaust gas to achieve a desired temperature at the particulate filter; determine the energy available from a post-injection process using the fuel system, a hydrocarbon injector, and a heating device configured to heat the exhaust gas in the particulate filter, that can be utilized to achieve the desired temperature; and determine a distribution of the energy available from the post-injection process, the hydrocarbon injector, and the heating device, to achieve the desired temperature.