SYSTEMS AND METHODS FOR INHIBITING DFCO

摘要

A system including a DFCO module. The DFCO module is configured to operate in a DFCO mode to deactivate fuel to a cylinder of an engine. A first flow rate module is configured to determine a reaction gas flow rate. An offset module is configured to determine a temperature offset value based on the reaction gas flow rate. A first temperature module is configured to estimate a first temperature of a catalyst of an exhaust system of the engine. A summer is configured to sum the temperature offset value and the first temperature to generate a summation value. A second temperature module configured to estimate a second temperature of the catalyst based on the summation value. A comparison module is configured to perform a first comparison between the second temperature and a threshold and generate an inhibit signal to inhibit operation in the DFCO mode based on the first comparison.

主权项

1. A system comprising:
a deceleration fuel cut-off (DFCO) module configured to operate in a DFCO mode to deactivate fuel to a cylinder of an engine; a first flow rate module configured to determine a reaction gas flow rate; an offset module configured to determine a temperature offset value based on the reaction gas flow rate; a first temperature module configured to estimate a first temperature of a catalyst of an exhaust system of the engine; a summer configured to sum the temperature offset value and the first temperature to generate a summation value; a second temperature module configured to estimate a second temperature of the catalyst based on the summation value; and a comparison module configured to (i) perform a first comparison between the second temperature and a threshold, and (ii) generate an inhibit signal to inhibit operation in the DFCO mode based on the first comparison.