Exhaust aftertreatment system with diagnostic delay

摘要

An apparatus and method of controlling a vehicle aftertreatment system is provided. The aftertreatment system treats exhaust gas produced by the vehicle engine and includes a particulate filter, and a NOx reducing device such as a selective catalytic reduction (SCR) device. The particulate filter is configured to regenerate to remove accumulated particles when the exhaust gas is heated above a regeneration temperature. A diagnostic device is included for monitoring the aftertreatment system. The diagnostic device may be a sensor for measuring the oxides of nitrogen (NOx) and/or an SCR efficiency monitor. A controller is employed to optimize the function of the diagnostic device. The controller does not enable the diagnostic device when the vehicle is powered until one or more entry conditions are satisfied.

主权项

1. A vehicle comprising:
an engine producing an exhaust gas; an aftertreatment system for treating the exhaust gas, and including a particulate filter; wherein the particulate filter is configured to regenerate when the exhaust gas is heated above a regeneration temperature; at least one NOx sensor operatively connected to the aftertreatment system and adapted to determine an amount of NOx in the exhaust gas; at least one temperature sensor for sensing a temperature of the exhaust gas; a controller operatively connected to the NOx sensor; wherein the controller is configured to determine whether a predefined number of particulate filter regenerations has occurred; wherein the controller does not enable the NOx sensor when the engine is started until one or more entry conditions are each satisfied; and wherein the one or more entry conditions include a first entry condition, the first entry condition being satisfied when the predefined number of particulate filter regenerations has occurred.