NOx ESTIMATION USING LOCAL STATE-SPACE MODELS

摘要

Implementations described herein relate to utilizing discrete transient local state space models to modify an output from a steady state NOx estimation model to provide a final estimated NOx value. An engine operating space, defined by a speed and injection quantity map, is subdivided into several discrete local state spaces and a transient model is developed for each discrete state space to output a NOx estimation correction value. The transient models may be a regression model or the transient model may be an empirical map of data values. The NOx estimation correction value modifies a steady state NOx value to calculate the final NOx estimated value. The final NOx estimated value is then output to another component, such as a controller as an input for controlling one or more components of an engine, an aftertreatment system, and/or a diagnostic system.

主权项

1. A method comprising:
accessing, by a controller, a set of one or more combustion parameters; determining, using the controller, a steady state estimated NOx value based on a steady state model and the accessed set of one or more combustion parameters; determining, using the controller, a NOx estimation correction value based on a transient model and the accessed set of one or more combustion parameters; calculating, using the controller, a final estimated NOx value based on the determined steady state estimated NOx value and the determined NOx estimation correction value; and outputting the final estimated NOx value as a parameter value to an aftertreatment system component or an engine component.